LEASE by and between BMR-John Hopkins Court LLC, a Delaware limited liability company and aTyr Pharma, Inc., a Delaware corporation

Exhibit 10.9

LEASE

by and between

BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC,

a Delaware limited liability company

and

aTyr Pharma, Inc.,

a Delaware corporation

LEASE

THIS LEASE (this “Lease”) is entered into as of this 22^nd day of December, 2011 (the “Execution Date”), by and between BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC, a Delaware limited liability company (“Landlord”), and aTyr Pharma, Inc., a Delaware corporation (“Tenant”).

RECITALS

A. WHEREAS, Landlord owns certain real property (the “Property”) and the improvements on the Property located at ▇▇▇▇-▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇, including the building located thereon;

B. WHEREAS, Landlord wishes to lease to Tenant, and Tenant desires to lease from Landlord, certain premises (the “Premises”) located on the second (2^nd) floor of the building in which the Premises are located (the “Building”), pursuant to the terms and conditions of this Lease, as detailed below; and

C. WHEREAS, the parties anticipate that a portion of the Premises shown as “Phase 1” on the diagram of the Premises attached hereto as Exhibit A (“Phase 1”) will be ready for occupancy by Tenant prior to the portion of the Premises shown as “Phase 2” on the diagram of the Premises attached hereto as Exhibit A (“Phase 2”), and that Landlord will deliver possession of Phase 1 prior to the delivery of Phase 2.

AGREEMENT

NOW, THEREFORE, Landlord and Tenant, in consideration of the mutual promises contained herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound, agree as follows:

1. Lease of Premises. Effective on the Phase 1 Term Commencement Date with respect to Phase 1 of the Premises and the Phase 2 Term Commencement Date with respect to Phase 2 of the Premises, Landlord hereby leases to Tenant, and Tenant hereby leases from ▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇ and Phase 2 of the Premises, as shown on Exhibit A attached hereto, for use by Tenant in accordance with the Permitted Use (as defined below) and no other uses. The Property and all landscaping, parking facilities, private drives and other improvements and appurtenances related thereto, including the Building, are hereinafter collectively referred to as the “Project.” All portions of the Project that are for the non-exclusive use of tenants of the Building, including driveways, sidewalks, parking areas, landscaped areas, service corridors, stairways, elevators, public restrooms and public lobbies, are hereinafter referred to as “Common Area.”

2. Basic Lease Provisions. For convenience of the parties, certain basic provisions of this Lease are set forth herein. The provisions set forth herein are subject to the remaining terms and conditions of this Lease and are to be interpreted in light of such remaining terms and conditions.

2.1 This Lease shall take effect upon the Execution Date and, except as specifically otherwise provided within this Lease, each of the provisions hereof shall be binding upon and

inure to the benefit of Landlord and Tenant from the date of execution and delivery hereof by all parties hereto.

2.2 In the definitions below, each current Rentable Area (as defined below) is expressed in rentable square footage. Rentable Area and “Tenant’s Pro Rata Shares” are all subject to adjustment as provided in this Lease.


Definition or Provision		Means the Following
Approximate Rentable Area of Phase 1		12,431 square feet

Approximate Rentable Area of Phase 2		4,652 square feet

Approximate Rentable Area of Premises		17,083 square feet

Approximate Rentable Area of Building		72,192 square feet

Approximate Rentable Area of Project		72,192 square feet

Tenant’s Pro Rata Share of Building		17.22% with respect to Phase 1 6.44% with respect to Phase 2 23.66% with respect to the Premises

Tenant’s Pro Rata Share of Project		17.22% with respect to Phase 1 6.44% with respect to Phase 2 23.66% with respect to the Premises

2.3 Initial monthly and annual installments of Base Rent for the Premises (“Base Rent”) as of the applicable Term Commencement Date, subject to adjustment under this Lease:

Dates

Square Feet of
Rentable Area

Base Rent per
Square Foot of
Rentable Area

Monthly
Base Rent

Annual Base
Rent

Phase 1 Term

Commencement

Date - Phase 2

Term

Commencement

Date

12,431

$3.00 monthly

$37,293

N/A


Phase 2 Term Commencement Date - Month* 12	17,083	$3.00 monthly	$51,249	N/A
Months* 13-24	17,083	$3.09 monthly	$52,786	$633,432
Months* 25-36	17,083	$3.18 monthly	$54,370	$652,441
Months* 37-48	17,083	$3.28 monthly	$56,001	$672,014
Months* 49-60	17,083	$3.38 monthly	$57,681	$692,174

*	Note: Months are determined based on the Phase 1 Term Commencement Date.

2.4 Estimated Term Commencement Dates:

(a) With respect to Phase 1: May 1, 2012.

(b) With respect to Phase 2: June 1, 2012.

2.5 Estimated Term Expiration Date: April 30, 2017.

2.6 Security Deposit: $51,249.

2.7 Permitted Use: Office, laboratory and vivarium use in conformity with all federal, state, municipal and local laws, codes, ordinances, rules and regulations of Governmental Authorities (as defined below), committees, associations, or other regulatory committees, agencies or governing bodies having jurisdiction over the Premises, the Building, the Property, the Project, Landlord or Tenant, including both statutory and common law and hazardous waste rules and regulations (“Applicable Laws”)


2.8	Address for Rent Payment:	BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC
		▇.▇. ▇▇▇ ▇▇▇▇▇▇
		▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇-▇▇▇▇

2.9	Address for Notices to Landlord:	BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC
		▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇
		▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
		Attn: Vice President, Real Estate Counsel

2.10	Address for Notices to Tenant:	Prior to Commencement Date

		aTyr Pharma, Inc.
		▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇ #▇▇▇
		▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
		Attn: Vice President, Operations


		On and After Commencement Date

		aTyr Pharma, Inc.
		▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇
		▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
		Attn: Vice President, Operations

2.11	Address for Invoices to Tenant:	Same as Address for Notices

2.12	The following Exhibits are attached hereto and incorporated herein by reference:

Exhibit A

Premises

Exhibit B

Work Letter

Exhibit C

Acknowledgement of Term Commencement Date and Term

Expiration Date

Exhibit D

Form of Additional TI Allowance Acceptance Letter

Exhibit E

Form of Letter of Credit

Exhibit F

Rules and Regulations

Exhibit G

Form of Estoppel Certificate

Exhibit H

Form of Convertible Unsecured Promissory Note

3. Term. The actual term of this Lease (as the same may be extended pursuant to Article 42 hereof, and as the same may be earlier terminated in accordance with this Lease, the “Term”) shall commence on the actual Phase 1 Term Commencement Date (as defined in Article 4) for Phase 1 and the actual Phase 2 Term Commencement Date (as defined in Article 4) for Phase 2 and end on the date that is sixty (60) months after the actual Phase 1 Term Commencement Date (such date, the “Term Expiration Date”), subject to earlier termination of this Lease as provided herein. TENANT HEREBY WAIVES THE REQUIREMENTS OF SECTION 1933 OF THE CALIFORNIA CIVIL CODE, AS THE SAME MAY BE AMENDED FROM TIME TO TIME.

4. Possession and Commencement Date.

4.1 Landlord shall use commercially reasonable efforts to tender possession of Phase 1 to Tenant on the Estimated Phase 1 Term Commencement Date, with the Phase 1 work (the “Phase 1 Tenant Improvements”) required of Landlord described in the Work Letter attached hereto as Exhibit B (the “Work Letter”) Substantially Complete (as defined below). Landlord shall provide Tenant with access to Phase 1 at least thirty (30) days prior to the estimated Phase 1 Term Commencement Date for the installation and set-up of Tenant’s furniture, fixtures and equipment; provided that such access does not interfere with the construction of the Phase 2 Tenant Improvements (as defined below); and provided, further, that, if the Phase 1 Tenant Improvements are Substantially Complete before the date that is thirty (30) days prior to the Estimated Phase 1 Term Commencement Date, Landlord shall tender possession of Phase 1 to the Tenant on such earlier date and Tenant shall be allowed to start conducting business in Phase 1 (so long as Tenant has obtained all necessary permits and approvals required to conduct business in Phase 1 and Tenant’s activities in Phase 1 do not interfere with the construction of the Phase 2 Tenant Improvements), but not earlier than sixty (60) days prior to the Estimated Phase 1 Term Commencement Date. Tenant agrees that in the

event such work is not Substantially Complete on or before the Estimated Phase 1 Term Commencement Date for any reason, then (a) this Lease shall not be void or voidable, (b) Landlord shall not be liable to Tenant for any loss or damage resulting therefrom (except that, if Landlord does not deliver possession of Phase 1 to Tenant with the Tenant Improvements Substantially Complete by May 1, 2012, Tenant shall be entitled to rental abatement following the Phase 1 Term Commencement Date equal to one (1) day for each day of such delay beyond such date that Landlord fails to deliver possession of Phase 1 to Tenant), (c) the Term Expiration Date shall be extended accordingly and (d) Tenant shall not be responsible for the payment of any Base Rent or Tenant’s Share of Operating Expenses (as defined below) until the actual Phase 1 Term Commencement Date as described in Section 4.2 occurs. Landlord shall use commercially reasonable efforts to tender possession of Phase 2 to Tenant on the Estimated Phase 2 Term Commencement Date, with the Phase 2 work (the “Phase 2 Tenant Improvements” and, together with the Phase 1 Tenant Improvements, the “Tenant Improvements”) required of Landlord described in the Work Letter Substantially Complete by the Estimated Phase 2 Term Commencement Date; provided that, if the Phase 2 Tenant Improvements are Substantially Complete before the Estimated Phase 2 Term Commencement Date, Landlord shall tender possession of Phase 2 to the Tenant on such earlier date and Tenant shall be allowed to start conducting business in Phase 2 (so long as Tenant has obtained all necessary permits and approvals required to conduct business in Phase 2). The term “Substantially Complete” or “Substantial Completion” means that the Tenant Improvements (or applicable portion thereof) are substantially complete in accordance with the Approved Plans (as defined in the Work Letter), except for minor punch list items brought to Landlord’s attention by Tenant within thirty (30) days after Substantial Completion of the Tenant Improvements (or applicable portion thereof), which items Landlord shall promptly correct and/or repair upon receipt of notice from Tenant. Notwithstanding anything in this Lease (including the Work Letter) to the contrary, Landlord’s obligation to timely achieve Substantial Completion shall be subject to extension on a day-for-day basis as a result of Force Majeure (as defined below).

4.2 The “Phase 1 Term Commencement Date” shall be the latest of (a) the Estimated Phase 1 Term Commencement Date, (b) the day Landlord tenders possession of Phase 1 to Tenant with the Phase 1 Tenant Improvements Substantially Complete and (c) the day that is thirty (30) days after Tenant is provided access to Phase 1 for the installation and set up of Tenant’s furniture, fixtures and equipment, as described in Section 4.1. The “Phase 2 Term Commencement Date” shall be the later of (y) the Estimated Phase 2 Term Commencement Date and (z) the day on which Landlord tenders possession of Phase 2 to Tenant with the Phase 2 Tenant Improvements Substantially Complete. The Phase 1 Term Commencement Date and the Phase 2 Term Commencement Date shall be referred to herein, collectively, as the “Term Commencement Dates,” or individually as a “Term Commencement Date.” If possession is delayed by action of Tenant, then the applicable Term Commencement Date shall be the date that such Term Commencement Date would have occurred but for such delay. Tenant shall execute and deliver to Landlord written acknowledgment of the Phase 1 Term Commencement Date and the Term Expiration Date within ten (10) days after Tenant takes occupancy of Phase 1, in the form attached as Exhibit C hereto. Tenant shall execute and deliver to Landlord written acknowledgment of the Phase 2 Term Commencement Date within ten (10) days after Tenant takes occupancy of Phase 2, in the form attached as Exhibit C hereto. Failure to execute and deliver such acknowledgments, however, shall not affect the Term Commencement Dates or

Landlord’s or Tenant’s liability hereunder. Failure by Tenant to obtain validation by any medical review board or other similar governmental licensing of the Premises required for the Permitted Use by Tenant shall not serve to extend the Term Commencement Dates.

4.3 Before Tenant enters upon any portion of the Premises prior to a Term Commencement Date as provided in Section 4.1 for the purpose of installing improvements or the placement of personal property, Tenant shall furnish to Landlord evidence satisfactory to Landlord that insurance coverages required of Tenant under the provisions of Article 23 are in effect, and such entry shall be subject to all the terms and conditions of this Lease other than the payment of Base Rent or Tenant’s Share of Operating Expenses (as defined below); provided that, if Tenant enters upon Phase 1 before the date that is thirty (30) days prior to the Estimated Phase 1 Term Commencement Date as provided in Section 4.1, Tenant shall pay the cost for all utilities used by Tenant in the Premises during such period prior to the Phase 1 Term Commencement Date; and provided, further, that, if a Term Commencement Date is delayed due to any early access by Tenant on the Premises, then such Term Commencement Date shall be the date that such Term Commencement Date would have occurred but for such delay.

4.4 Landlord shall cause the Tenant Improvements to be constructed in the Premises pursuant to the Work Letter at a cost to Landlord not to exceed (a) One Million Two Hundred Eighty-One Thousand Two Hundred Twenty-Five Dollars ($1,281,225) (based upon Seventy-Five Dollars ($75) per square foot of Rentable Area (as defined below)) (the “Base TI Allowance”) plus (b) if properly requested by Tenant pursuant to this Section, up to an additional Four Hundred Twenty-Seven Thousand Seventy-Five Dollars ($427,075) (based upon Twenty-Five Dollars ($25) per square foot of Rentable Area) (the “Additional TI Allowance”), for a total of up to One Million Seven Hundred Eight Thousand Three Hundred Dollars ($1,708,300) (based upon One Hundred Dollars ($100) per square foot of Rentable Area). The Base TI Allowance, together with Additional TI Allowance (if properly requested by Tenant pursuant to this Article), shall be referred to herein as the “TI Allowance.” The TI Allowance may be applied to the costs of (1) construction, (m) project management by Landlord (which fee shall equal three percent (3%) of the cost of the Tenant Improvements, including the Base TI Allowance and, if used by Tenant, the Additional TI Allowance), (n) space planning, architect, engineering and other related services performed by third parties unaffiliated with Tenant, (o) building permits and other taxes, fees, charges and levies by Governmental Authorities (as defined below) for permits or for inspections of the Tenant Improvements, (p) labor and materials, (q) equipment, furniture and fixtures, (r) commercially reasonable costs for the installation of data cabling and wiring in or to the Premises, (s) Tenant Signage (as defined below) in conformance with the requirements of Section 12.7, (t) Tenant’s actual third party costs and expenses incurred in connection with relocating to the Premises and (u) the cost of Tenant’s third party project manager hired to oversee the construction of the Tenant Improvements. In no event shall (x) the TI Allowance be used for (i) payments to Tenant or any affiliates of Tenant, (ii) the purchase of any furniture, personal property or other non-building system equipment, (iii) costs resulting from any default by Tenant of its obligations under this Lease or (iv) costs that are recoverable by Tenant from a third party (e.g., insurers, warrantors, or tortfeasors), or (y) more than ten percent (10%) of the TI Allowance be used for costs and expenses described in clause (q) above and other personal property.

4.5 Base Rent shall be increased to include the amount of the Additional TI Allowance disbursed by Landlord in accordance with this Lease amortized over the initial Term at a rate of eight percent (8%) annually. Tenant shall have until the date that is nine (9) months after the Phase 1 Term Commencement Date (the “TI Deadline”) to expend the unused portion of the TI Allowance, after which date Landlord’s obligation to fund such costs shall expire. The amount by which Base Rent shall be increased shall be determined (and Base Rent shall be increased accordingly) as of the Phase 1 Term Commencement Date and, if such determination does not reflect use by Tenant of all of the Additional TI Allowance, shall be determined again as of the TI Deadline, with Tenant paying (on the next succeeding day that Base Rent is due under this Lease (the “TI True-Up Date”)) any underpayment of the further adjusted Base Rent for the period beginning on the Phase 1 Term Commencement Date and ending on the TI True-Up Date. For purposes of illustration only, if Tenant properly requests and utilizes all of the Additional TI Allowance, the monthly Base Rent shall be increased to Three Dollars and Fifty-One Cents ($3.51) per square foot during the first twelve (12) months of the initial Term.

4.6 Landlord shall not be obligated to expend any portion of the Additional TI Allowance until Landlord shall have received from Tenant a letter in the form attached as Exhibit D hereto executed by an authorized officer of Tenant. In no event shall any unused TI Allowance entitle Tenant to a credit against Rent payable under this Lease.

5. Condition of Premises. On the date of Landlord’s delivery of possession of the Premises to Tenant, the HVAC, electrical, plumbing, mechanical and sprinkler systems of the Premises shall be in good working order and repair. Except as provided in the previous sentence, Tenant acknowledges that neither Landlord nor any agent of Landlord has made any representation or warranty with respect to the condition of the Premises, the Building or the Project, or with respect to the suitability of the Premises, the Building or the Project for the conduct of Tenant’s business. Except as provided in the first sentence of this Article 5, Tenant acknowledges that (a) it is fully familiar with the condition of the Premises and agrees to take the same in its condition “as is” as of the applicable Term Commencement Date and (b) Landlord shall have no obligation to alter, repair or otherwise prepare the Premises for Tenant’s occupancy or to pay for or construct any improvements to the Premises, except with respect to the Base TI Allowance and, if properly requested by Tenant pursuant to the terms of die Lease, the Additional TI Allowance.

6. Rentable Area.

6.1 The term “Rentable Area” shall reflect such areas as reasonably calculated by Landlord’s architect, as the same may be reasonably adjusted from time to time by Landlord in consultation with Landlord’s architect but only to reflect actual physical changes to the Premises, the Building or the Project, as applicable.

6.2 The Rentable Area of the Building is generally determined by making separate calculations of Rentable Area applicable to each floor within the Building and totaling the Rentable Area of all floors within the Building. The Rentable Area of a floor is computed by measuring to the outside finished surface of the permanent outer Building walls. The full area calculated as previously set forth is included as Rental Area, without deduction for columns and

projections or vertical penetrations, including stairs, elevator shafts, flues, pipe shafts, vertical ducts and the like, as well as such items’ enclosing walls.

6.3 The term “Rentable Area,” when applied to the Premises, is that area equal to the usable area of the Premises, plus an equitable allocation of Rentable Area within the Building that is not then utilized or expected to be utilized as usable area (but specifically excluding any vacant space in the Building that Landlord reasonably deems to be leasable), including that portion of the Building devoted to corridors, equipment rooms, restrooms, elevator lobby, atrium and mailroom.

7. Rent.

7.1 Tenant shall pay to Landlord as Base Rent for Phase 1, commencing on the Phase 1 Term Commencement Date, the applicable portion of the sums set forth in Section 2.3, and as Base Rent for the entire Premises, commencing on the Phase 2 Term Commencement Date, the sums set forth in Section 2.3, subject to the rental adjustments provided in Article 8 hereof. Base Rent shall be paid in equal monthly installments as set forth in Section 2.3, subject to the rental adjustments provided in Article 8 hereof, each in advance on the first day of each and every calendar month during the Term. On the Execution Date, Tenant shall execute and deliver to BioMed Realty, L.P., the sole member of the Landlord, that certain Subordinated Convertible Unsecured Promissory Note of Tenant in the form attached hereto as Exhibit H (the “Convertible Promissory Note”), a portion of which Convertible Promissory Note represents Tenant’s payment of (a) one hundred percent (100%) of the Base Rent during the first (1^st) twelve (12) months of the initial Term beginning on the Phase 1 Term Commencement Date and (b) a portion of Base Rent for each remaining month of the initial Term equal to the quotient of (m) the positive difference between (i) One Million Dollars ($1,000,000) and (ii) the sum of all Base Rent during the first (1^st) twelve (12) months of the initial Term beginning on the Phase 1 Term Commencement Date, divided by (n) forty-eight (48).

7.2 In addition to Base Rent, Tenant shall pay to Landlord as additional rent (“Additional Rent”) at times hereinafter specified in this Lease (a) Tenant’s Share (as defined below) of Operating Expenses (as defined below), (b) the Property Management Fee (as defined below) and (c) any other amounts that Tenant assumes or agrees to pay under the provisions of this Lease that are owed to Landlord, including any and all other sums that may become due by reason of any default of Tenant or failure on Tenant’s part to comply with the agreements, terms, covenants and conditions of this Lease to be performed by Tenant, after notice and the lapse of any applicable cure periods.

7.3 Base Rent and Additional Rent shall together be denominated “Rent.” Rent shall be paid to Landlord, without abatement, deduction or offset (except as otherwise provided in this Lease), in lawful money of the United States of America at the office of Landlord as set forth in Section 2.8 or to such other person or at such other place as Landlord may from time designate in writing. In the event the Term commences or ends on a day other than the first day of a calendar month, then the Rent for such fraction of a month shall be prorated for such period on the basis of a thirty (30) day month and shall be paid at the then-current rate for such fractional month.

8. Rent Adjustments. Base Rent shall be subject to an annual upward adjustment of three percent (3%) of the then-current Base Rent during the initial Term, as set forth in the chart for Base Rent in Section 2.3. The first such adjustment shall become effective commencing on the first (1^st) annual anniversary of the Phase 1 Term Commencement Date, and subsequent adjustments shall become effective on every successive annual anniversary during the initial Term.

9. Operating Expenses.

9.1 As used herein, the term “Operating Expenses” shall include:

(a) Government impositions including property tax costs consisting of real and personal property taxes and assessments, including amounts due under any improvement bond upon the Building or the Project, including die parcel or parcels of real property upon which the Building and areas serving the Building are located or assessments in lieu thereof imposed by any federal, state, regional, local or municipal governmental authority, agency or subdivision (each, a “Governmental Authority”) are levied; taxes on or measured by gross rentals received from the rental of space in the Project; taxes based on the square footage of the Premises, the Building or the Project, as well as any parking charges, utilities surcharges or any other costs levied, assessed or imposed by, or at the direction of, or resulting from Applicable Laws or interpretations thereof, promulgated by any Governmental Authority in connection with the use or occupancy of the Project or the parking facilities serving the Project; taxes on this transaction or any document to which Tenant is a party creating or transferring an interest in the Premises; any fee for a business license to operate an office building; and any expenses, including the reasonable cost of attorneys or experts, reasonably incurred by Landlord in seeking reduction by the taxing authority of the applicable taxes, less tax refunds obtained as a result of an application for review thereof (i.e., any such tax refunds obtained as a result of such expenditures will be credited against Operating Expenses for the applicable year(s)). Notwithstanding anything to the contrary in this Lease, Operating Expenses shall not include any net income, franchise, capital stock, estate or inheritance taxes, or taxes that are the personal obligation of Tenant or of another tenant of the Project; Landlord’s general income taxes, transfer taxes (except as set forth above); gift taxes; any excise taxes imposed upon Landlord based upon rentals or income received by it (except if levied in lieu of real property taxes); taxes attributable to any period outside of the Term (provided that any holdover by Tenant shall be considered within the Term for purposes of this provision); any assessments, charges, taxes, rents, fees, rates, levies, excises, license fees, permit fees, inspection fees, impact fees, concurrency fees or other fees or charges to the extent allocable to or caused by the development or installation of on- or off-site improvements or utilities (including street and intersection improvements, roads, rights of way, lighting and signalization) related solely to any future expansion of the Building, or any allocations, reserves or sinking fund relating to such expansion, unless the same are contained in the property tax bills for the Project; and

(b) All other costs of any kind paid or incurred by Landlord in connection with the operation or maintenance of the Building and the Project (provided that any costs for services, maintenance, repairs and the like provided directly by Landlord or affiliates of Landlord shall be at commercially reasonable prices), including costs of repairs and

replacements to non-structural improvements within the Project as appropriate to maintain the Project as required hereunder, costs of utilities furnished to the Common Areas; sewer fees; cable television; trash collection; cleaning, including windows; heating; ventilation; air-conditioning; maintenance of landscaping and grounds; maintenance of drives and parking areas; maintenance of the roof (not including replacement of any structural components thereof); security services and devices; building supplies; maintenance or replacement of equipment utilized for operation and maintenance of the Project, provided if the cost of replacing any equipment is a capital expenditure, such cost shall be amortized as set forth below; license, permit and inspection fees; sales, use and excise taxes on goods and services purchased by Landlord in connection with the operation, maintenance or repair of the Building or Project systems and equipment; telephone, postage, stationery supplies and other expenses incurred in connection with the operation, maintenance or repair of the Project; accounting, legal and other professional fees and expenses incurred in connection with the Project; costs of furniture, draperies, carpeting, landscaping and other customary and ordinary items of personal property provided by Landlord for use in Common Areas; the cost of capital repairs, replacements or other improvements or other costs incurred in connection with the Project (A) which are intended to reduce current or future Operating Expenses to the extent of cost savings reasonably anticipated by Landlord (based upon reasonable supporting documentation) at the time of such expenditure to be incurred in connection therewith, (B) that are required under any Applicable Laws (except to the extent such costs are incurred to remedy non-compliance as of the Commencement Date with Applicable Laws), and (C) the cost of replacing any systems and equipment or major components of any systems and equipment that cannot be repaired for a commercially reasonable price or that is beyond its useful life (provided such capital expenditures shall be amortized over their useful life in accordance with generally accepted accounting principles as applied by Landlord); costs of complying with Applicable Laws (except to the extent such costs are incurred to remedy non-compliance as of the Commencement Date with Applicable Laws); costs to keep the Project in compliance with, or fees otherwise required under, any CC&Rs (as defined below); insurance premiums, including premiums for public liability, property casualty, earthquake, terrorism and environmental coverages; portions of insured losses paid by Landlord as part of the deductible portion of a loss pursuant to the terms of insurance policies (provided, however, that if and to the extent Landlord incurs a deductible payment in excess of Fifty Thousand Dollars ($50,000) (such excess, the “Excess Deductible Amount”), any such Excess Deductible Amount shall be amortized over a reasonable period of time in accordance with generally accepted accounting principles as applied by Landlord, together with interest at the rate paid by Landlord on any funds borrowed for such expenditures from an unaffiliated third-party financial institution, but in no event in excess of the market rate of interest customarily paid on such borrowed funds for such purposes); service contracts; costs of services of independent contractors retained to do work of a nature referenced above; and costs of compensation (including employment taxes and fringe benefits) of all persons who perform regular and recurring duties connected with the day-to-day operation and maintenance of the Project, its equipment, the adjacent walks, landscaped areas, drives and parking areas, including janitors, floor waxers, window washers, watchmen, gardeners, sweepers and handymen.

Notwithstanding the foregoing, Operating Expenses shall not include any leasing commissions or other costs incurred in procuring tenants, or any fee in lieu of commissions;

expenses that relate to preparation of rental space for a tenant; expenses of initial development and construction, including grading, paving, landscaping and decorating (as distinguished from maintenance, repair and replacement of the foregoing); legal expenses relating to other tenants; costs of any nature to the extent reimbursed by condemnation awards, another tenant of the Building (except as part of such tenant’s operating expenses) or otherwise or payment of insurance proceeds received by Landlord; interest upon loans to Landlord or secured by a mortgage or deed of trust covering the Project or a portion thereof (provided that interest upon a government assessment or improvement bond payable in installments shall constitute an Operating Expense under Subsection 9.1(a)); salaries of executive officers of Landlord; depreciation claimed by Landlord for tax purposes (provided that this exclusion of depreciation is not intended to delete from Operating Expenses actual costs of repairs and replacements in regard thereto that are provided for in Subsection 9.1(b)); and taxes that are excluded from Operating Expenses by the last sentence of Subsection 9.1(a); the cost of providing any service directly to and paid directly by any tenant (outside of such tenant’s operating expense payments); ground lease payments (if any); Landlord’s general corporate overhead; any compensation paid to clerks, attendants or other persons in commercial concessions operated by Landlord (other than in the parking facility for the Project); marketing costs, including attorneys’ fees in connection with the negotiation and preparation of letters, deal memos, letters of intent, leases, subleases or assignments, space planning costs, and other costs and expenses incurred in connection with lease, sublease or assignment negotiations and transactions with present or prospective tenants or other occupants of the Building; expenses in connection with services or other benefits that are not offered to Tenant or for which Tenant is charged directly but that are provided to another tenant or occupant of the Building, without charge; electric power costs or other utility costs for which any tenant directly contracts with the local public service company; costs of correcting defects in or inadequacy of the initial design or construction of the Building or any future expansion of the Building; costs incurred to comply with Applicable Laws relating to the removal of Hazardous Materials (as defined in Article 21 below) or to remove, remedy, treat or contain any Hazardous Material, provided this exclusion from Operating Expenses shall not affect Tenant’s obligations relating to Hazardous Materials in Article 21; costs of upgrades to the Building effectuated solely for the purpose of obtaining or upgrading a LEED certification or similar rating; reserves for future Operating Expenses; replacements of structural components of the Building and Building foundation; costs arising from the gross negligence or willful misconduct of Landlord or its agents, employees, vendors, contractors, or providers of materials or services; capital expenditures not otherwise permitted hereunder; and any property management fee, since Tenant pays the Property Management Fee separately pursuant to Section 9.2. To the extent that Tenant uses more than Tenant’s Pro Rata Share of any item of Operating Expenses, Tenant shall pay Landlord for such excess in addition to Tenant’s obligation to pay Tenant’s Pro Rata Share of Operating Expenses (such excess, together with Tenant’s Pro Rata Share, “Tenant’s Share”).

9.2 Tenant shall pay to Landlord on the first day of each calendar month of the Term, as Additional Rent, (a) the Property Management Fee (as defined below) and (b) Landlord’s estimate of Tenant’s Share of Operating Expenses with respect to the Building and the Project, as applicable, for such month.

(x) The “Property Management Fee” shall equal three percent (3%) of Base Rent due from Tenant. Tenant shall pay the Property Management Fee in accordance with Section 9.2 with respect to the entire Term, including any extensions thereof or any holdover periods, regardless of whether Tenant is obligated to pay Base Rent, Operating Expenses or any other Rent with respect to any such period or portion thereof.

(y) Within ninety (90) days after the conclusion of each calendar year (or such longer period as may be reasonably required by Landlord), Landlord shall furnish to Tenant a statement showing in reasonable detail the actual Operating Expenses and Tenant’s Share of Operating Expenses for the previous calendar year. Any additional sum due from Tenant to Landlord shall be immediately due and payable. If the amounts paid by Tenant pursuant to this Section exceed Tenant’s Share of Operating Expenses for the previous calendar year, then Landlord shall credit the difference against the Rent next due and owing from Tenant; provided that, if the Lease term has expired, Landlord shall accompany said statement with payment for the amount of such difference.

(z) Any amount due under this Section for any period that is less than a full month shall be prorated (based on a thirty (30)-day month) for such fractional month.

9.3 Landlord may, from time to time, modify Landlord’s calculation and allocation procedures for Operating Expenses, so long as such modifications produce Dollar results substantially consistent with Landlord’s then-current practice at the Project.

9.4 Landlord’s annual statement shall be final and binding upon Tenant unless Tenant, within sixty (60) days after Tenant’s receipt thereof, shall contest any item therein by giving written notice to Landlord, specifying each item contested and the reasons therefore; provided that Tenant shall in all events pay the amount specified in Landlord’s annual statement, pending the results of the Independent Review and determination of the Accountant(s), as applicable and as each such term is defined below. If during such sixty (60)-day period, Tenant reasonably and in good faith questions or contests the correctness of Landlord’s statement of Tenant’s Share (as defined in Section 9.1) of Operating Expenses, Landlord shall provide Tenant with reasonable access to Landlord’s books and records to the extent relevant to determination of Operating Expenses, and such information as Landlord reasonably determines to be responsive to Tenant’s written inquiries. In the event that, after Tenant’s review of such information, Landlord and Tenant cannot agree upon the amount of Tenant’s Share of Operating Expenses, then Tenant shall have the right to have an independent public accounting firm hired by Tenant on an hourly basis and not on a contingent-fee basis (at Tenant’s sole cost and expense) and approved by Landlord (which approval Landlord shall not unreasonably withhold or delay) audit and review such of Landlord’s books and records for the year in question as directly relate to the determination of Operating Expenses for such year (the “Independent Review”). Landlord shall make such books and records available at the location where Landlord maintains them in the ordinary course of its business. Landlord need not provide copies of any books or records. Tenant shall commence the Independent Review within fifteen (15) days after the date Landlord has given Tenant access to Landlord’s books and records for the Independent Review. Tenant shall complete the Independent Review and notify Landlord in writing of Tenant’s specific objections to Landlord’s calculation of Operating Expenses (including Tenant’s accounting

firm’s written statement of the basis, nature and amount of each proposed adjustment) no later than sixty (60) days after Landlord has first given Tenant access to Landlord’s books and records for the Independent Review. Landlord shall review the results of any such Independent Review. The parties shall endeavor to agree promptly and reasonably upon Operating Expenses taking into account the results of such Independent Review. If, as of sixty (60) days after Tenant has submitted the Independent Review to Landlord, the parties have not agreed on the appropriate adjustments to Operating Expenses, then the parties shall engage a mutually agreeable independent third party accountant with at least ten (10) years’ experience in commercial real estate accounting in the San Diego, California, area (the “Accountant”). If the parties cannot agree on the Accountant, each shall within ten (10) days after such impasse appoint an Accountant (different from the accountant and accounting firm that conducted the Independent Review) and, within ten (10) days after the appointment of both such Accountants, those two Accountants shall select a third (which cannot be the accountant and accounting firm that conducted the Independent Review). If either party fails to timely appoint an Accountant, then the Accountant the other party appoints shall be the sole Accountant. Within ten (10) days after appointment of the Accountant(s), Landlord and Tenant shall each simultaneously give the Accountants (with a copy to the other party) its determination of Operating Expenses, with such supporting data or information as each submitting party determines appropriate. Within ten (10) days after such submissions, the Accountants shall by majority vote select either Landlord’s or Tenant’s determination of Operating Expenses. The Accountants may not select or designate any other determination of Operating Expenses. The determination of the Accountant(s) shall bind the parties. If the parties agree or the Accountant(s) determine that the Operating Expenses actually paid by Tenant for the calendar year in question exceeded Tenant’s obligations for such calendar year, then Landlord shall, at Tenant’s option, either (a) credit the excess to the next succeeding installments of estimated Additional Rent or (b) pay the excess to Tenant within thirty (30) days after delivery of such results. If the parties agree or the Accountant(s) determine that Tenant’s payments of Operating Expenses for such calendar year were less than Tenant’s obligation for the calendar year, then Tenant shall pay the deficiency to Landlord within thirty (30) days after delivery of such results. If the Independent Review reveals or the Accountant(s) determine that the Operating Expenses billed to Tenant by Landlord and actually paid by Tenant to Landlord for the applicable calendar year in question exceeded by more than five percent (5%) what Tenant should have been billed during such calendar year, then Landlord shall pay the reasonable cost of the Accountant(s) and the Independent Review. In all other cases Tenant shall pay the cost of the Independent Review and the Accountant(s).

9.5 Except as provided in Section 4.3, Tenant shall not be responsible for Operating Expenses attributable to the time period prior to the applicable Term Commencement Date. Tenant’s responsibility for Tenant’s Share of Operating Expenses shall continue to the latest of (a) the date of termination of the Lease, and (b) the date Tenant has fully vacated the Premises.

9.6 Operating Expenses for the calendar year in which Tenant’s obligation to share therein commences and for the calendar year in which such obligation ceases shall be prorated on a basis reasonably determined by Landlord. Expenses such as taxes, assessments and insurance premiums that are incurred for an extended time period shall be prorated based upon the time periods to which they apply so that the amounts attributed to the Premises relate in a

reasonable manner to the time period wherein Tenant has an obligation to share in Operating Expenses.

9.7 Within ten (10) business days after the end of each calendar month, Tenant shall submit to Landlord an invoice, or, in the event an invoice is not available, an itemized list, of all costs and expenses that (a) Tenant has incurred (either internally or by employing third parties) during the prior month and (b) for which Tenant reasonably believes it is entitled to reimbursements from Landlord pursuant to the terms of this Lease or that Tenant reasonably believes is the responsibility of Landlord pursuant to this Lease or the Work Letter; provided that, for the avoidance of doubt, the parties acknowledge that Tenant’s obligations to notify Landlord if Tenant believes that the estimated Operating Expenses paid by Tenant are higher than the actual Operating Expenses incurred by Landlord shall be governed by Section 9.4.

9.8 In the event that the Building or Project is less than fully occupied, Tenant acknowledges that Landlord may extrapolate Operating Expenses that vary depending on the occupancy of the Building or Project, including utilities, water, sewer, trash removal, janitorial service and supplies and floor cleaning and repairs (collectively, “Variable Operating Expenses”), as applicable, by dividing (a) the total cost of Variable Operating Expenses by (b) the Rentable Area of the Building or Project (as applicable) that is occupied, then multiplying (y) the resulting quotient by (z) one hundred percent (100%) of the total Rentable Area of the Building or Project (as applicable). Tenant shall pay Tenant’s Share of the product of (y) and (z), subject to adjustment as reasonably determined by Landlord; provided, however, that Landlord shall not recover more than one hundred percent (100%) of Variable Operating Expenses.

10. Taxes on Tenant’s Property.

10.1 Tenant shall pay prior to delinquency any and all taxes levied against any personal property or trade fixtures placed by Tenant in or about the Premises.

10.2 If any such taxes on Tenant’s personal property or trade fixtures are levied against Landlord or Landlord’s property or, if the assessed valuation of the Building, the Property or the Project is increased by inclusion therein of a value attributable to Tenant’s personal property or trade fixtures, and if Landlord, after written notice to Tenant, pays the taxes based upon any such increase in the assessed value of the Building, the Property or the Project, then Tenant shall, upon demand, repay to Landlord the taxes so paid by Landlord.

10.3 If any improvements in or alterations to the Premises, whether owned by Landlord or Tenant and whether or not affixed to the real property so as to become a part thereof, are assessed for real property tax purposes at a valuation higher than the valuation at which improvements conforming to Landlord’s building standards (the “Building Standard”) in other spaces in the Building are assessed, then the real property taxes and assessments levied against Landlord or the Building, the Property or the Project by reason of such excess assessed valuation shall be deemed to be taxes levied against personal property of Tenant and shall be governed by the provisions of Section 10.2. Any such excess assessed valuation due to improvements in or alterations to space in the Project leased by other tenants at the Project shall not be included in Operating Expenses. If the records of the County Assessor are available and

sufficiently detailed to serve as a basis for determining whether said Tenant improvements or alterations are assessed at a higher valuation than the Building Standard, then such records shall be binding on both Landlord and Tenant.

11. Security Deposit.

11.1 Tenant shall deposit with Landlord on or before the Execution Date the sum set forth in Section 2.6 (the “Security Deposit”), which sum shall be held by Landlord as security for the faithful performance by Tenant of all of the terms, covenants and conditions of this Lease to be kept and performed by Tenant during the period commencing on the Execution Date and ending upon the expiration or termination of Tenant’s obligations under this Lease. If Tenant Defaults with respect to any provision of this Lease, including any provision relating to the payment of Rent, then Landlord may (but shall not be required to) use, apply or retain all or any part of the Security Deposit for the payment of any Rent or any other sum in Default, or to compensate Landlord for any other loss or damage that Landlord may suffer by reason of Tenant’s Default. If any portion of the Security Deposit is so used or applied, then Tenant shall, within ten (10) days following demand therefor, deposit cash with Landlord in an amount sufficient to restore the Security Deposit to its original amount, and Tenant’s failure to do so shall be a material breach of this Lease. The provisions of this Article shall survive the expiration or earlier termination of this Lease. TENANT HEREBY WAIVES THE REQUIREMENTS OF SECTION 1950.7 OF THE CALIFORNIA CIVIL CODE, AS THE SAME MAY BE AMENDED FROM TIME TO TIME.

11.2 In the event of bankruptcy or other debtor-creditor proceedings against Tenant, the Security Deposit shall be deemed to be applied first to the payment of Rent and other charges due Landlord for all periods prior to the filing of such proceedings.

11.3 Landlord may deliver to any purchaser of Landlord’s interest in the Premises the funds deposited hereunder by Tenant, and thereupon Landlord shall be discharged from any further liability with respect to such deposit. This provision shall also apply to any subsequent transfers.

11.4 If Tenant shall fully and faithfully perform every provision of this Lease to be performed by it, then the Security Deposit, or any balance thereof, shall be returned to Tenant (or, at Landlord’s option, to the last assignee of Tenant’s interest hereunder) within thirty (30) days after the expiration or earlier termination of this Lease.

11.5 [Intentionally omitted.]

11.6 If the Security Deposit shall he in cash, Landlord shall hold the Security Deposit in an account at a banking organization selected by Landlord; provided, however, that Landlord shall not be required to maintain a separate account for the Security Deposit, but may intermingle it with other funds of Landlord. Landlord shall be entitled to all interest and/or dividends, if any, accruing on the Security Deposit. Landlord shall not be required to credit Tenant with any interest for any period during which Landlord does not receive interest on the Security Deposit.

11.7 The Security Deposit may be in the form of cash, a letter of credit or any other security instrument acceptable to Landlord in its sole discretion. Tenant may at any time, except when Tenant is in Default (as defined below), deliver a letter of credit (the “L/C Security”) as the entire Security Deposit, as follows:

(a) If Tenant elects to deliver L/C Security, then Tenant shall provide Landlord, and maintain in full force and effect throughout the Term and until the date that is six (6) months after the then-current Term Expiration Date, a letter of credit in the form of Exhibit E issued by an issuer reasonably satisfactory to Landlord, in the amount of the Security Deposit, with an initial term of at least one year. Landlord may require the L/C Security to be re-issued by a different issuer at any time during the Term if Landlord reasonably believes that the issuing bank of the L/C Security is or may soon become insolvent; provided, however, Landlord shall return the existing L/C Security to the existing issuer immediately upon receipt of the substitute L/C Security. If any issuer of the L/C Security shall become insolvent or placed into FDIC receivership, then Tenant shall immediately deliver to Landlord (without the requirement of notice from Landlord) substitute L/C Security issued by an issuer reasonably satisfactory to Landlord, and otherwise conforming to the requirements set forth in this Article. As used herein with respect to the issuer of the L/C Security, “insolvent” shall mean the determination of insolvency as made by such issuer’s primary bank regulator (i.e., the state bank supervisor for state chartered banks; the OCC or OTS, respectively, for federally chartered banks or thrifts; or the Federal Reserve for its member banks). If, at the Term Expiration Date, any Rent remains uncalculated or unpaid, then: (i) Landlord shall with reasonable diligence complete any necessary calculations; (ii) Tenant shall extend the expiry date of such L/C Security from time to time as Landlord reasonably requires; and (iii) in such extended period, Landlord shall not unreasonably refuse to consent to an appropriate reduction of the L/C Security. Tenant shall reimburse Landlord’s legal costs (as estimated by Landlord’s counsel) in handling Landlord’s acceptance of L/C Security or its replacement or extension.

(b) If Tenant delivers to Landlord satisfactory L/C Security in place of the entire Security Deposit, Landlord shall remit to Tenant any cash Security Deposit Landlord previously held.

(c) Landlord may draw upon the L/C Security, and hold and apply the proceeds in the same manner and for the same purposes as the Security Deposit, if: (i) an uncured Default (as defined below) exists; (ii) as of the date forty-five (45) days before any L/C Security expires (even if such scheduled expiry date is after the Term Expiration Date) Tenant has not delivered to Landlord an amendment or replacement for such L/C Security, reasonably satisfactory to Landlord, extending the expiry date to the earlier of (1) six (6) months after the then-current Term Expiration Date or (2) the date one year after the then-current expiry date of the L/C Security; (iii) the L/C Security provides for automatic renewals, Landlord asks the issuer to confirm the current L/C Security expiry date, and the issuer fails to do so within ten (10) business days; (iv) Tenant fails to pay (when and as Landlord reasonably requires) any bank charges for Landlord’s transfer of the L/C Security; or (v) the issuer of the L/C Security ceases, or announces that it will cease, to maintain an office in the city where Landlord may present drafts under the L/C Security (and fails to permit drawing upon the L/C Security by overnight

courier or facsimile). This Section does not limit any other provisions of this Lease allowing Landlord to draw the L/C Security under specified circumstances.

(d) Tenant shall not seek to enjoin, prevent, or otherwise interfere with Landlord’s draw under L/C Security, even if it violates this Lease. Tenant acknowledges that the only effect of a wrongful draw would be to substitute a cash Security Deposit for L/C Security, causing Tenant no legally recognizable damage. Landlord shall hold the proceeds of any draw in the same manner and for the same purposes as a cash Security Deposit. In the event of a wrongful draw, the parties shall cooperate to allow Tenant to post replacement L/C Security simultaneously with the return to Tenant of the wrongfully drawn sums, and Landlord shall upon request confirm in writing to the issuer of the L/C Security that Landlord’s draw was erroneous.

(e) If Landlord transfers its interest in the Premises, then Tenant shall at Tenant’s expense, within five (5) business days after receiving a request from Landlord, deliver (and, if the issuer requires, Landlord shall consent to) an amendment to the L/C Security naming Landlord’s grantee as substitute beneficiary. If the required Security Deposit changes while L/C Security is in force, then Tenant shall deliver (and, if the issuer requires, Landlord shall consent to) a corresponding amendment to the L/C Security.

12. Use.

12.1 Tenant shall use the Premises for the purpose set forth in Section 2.7, and shall not use the Premises, or permit or suffer the Premises to be used, for any other purpose without Landlord’s prior written consent, which consent Landlord may withhold in its sole and absolute discretion.

12.2 Tenant shall not use or occupy the Premises in violation of Applicable Laws; zoning ordinances; or the certificate of occupancy issued for the Building or the Project, and shall, upon five (5) days’ written notice from Landlord, discontinue any use of the Premises that is declared or claimed by any Governmental Authority having jurisdiction to be a violation of any of the above, or that in Landlord’s reasonable opinion violates any of the above. Tenant shall comply with any direction of any Governmental Authority having jurisdiction that shall, by reason of the nature of Tenant’s use or occupancy of the Premises, impose any duty upon Tenant or Landlord with respect to the Premises or with respect to the use or occupation thereof.

12.3 Tenant shall not do or permit to be done anything that will invalidate or increase the cost of any fire, environmental, extended coverage or any other insurance policy covering the Building or the Project, and shall comply with all rules, orders, regulations and requirements of the insurers of the Building and the Project, and Tenant shall promptly, upon demand, reimburse Landlord for any additional premium charged for such policy by reason of Tenant’s failure to comply with the provisions of this Article.

12.4 Tenant shall keep all doors opening onto public corridors closed, except when in use for ingress and egress.

12.5 No additional locks or bolts of any kind shall be placed upon any of the doors or windows by Tenant, nor shall any changes be made to existing locks or the mechanisms thereof

without Landlord’s prior written consent, which consent shall not be unreasonably withheld. Tenant shall, upon termination of this Lease, return to Landlord all keys to offices and restrooms either furnished to or otherwise procured by Tenant. In the event any key so furnished to Tenant is lost, Tenant shall pay to Landlord the cost of replacing the same or of changing the lock or locks opened by such lost key if Landlord shall deem it necessary to make such change.

12.6 No awnings or other projections shall be attached to any outside wall of the Building, No curtains, blinds, shades or screens shall be attached to or hung in, or used in connection with, any window or door of the Premises other than Landlord’s standard window coverings. Neither the interior nor exterior of any windows shall be coated or otherwise sunscreened without Landlord’s prior written consent, nor shall any bottles, parcels or other articles be placed on the windowsills. No equipment, furniture or other items of personal property shall be placed on any exterior balcony without Landlord’s prior written consent.

12.7 No sign, advertisement or notice (“Signage”) shall be exhibited, painted or affixed by Tenant on any party of the Premises or the Building without Landlord’s prior written consent (which consent shall not be unreasonably withheld). Subject to the preceding sentence and at Tenant’s election, Tenant shall be entitled to the following Signage to the extent permitted by Applicable Laws and to the extent it does not prevent another tenant of the Building from receiving its pro rata share of the Building Signage: (i) Building-top Signage, (ii) monument Signage, and (iii) Signage in the main lobby on the glass walls near the entry, all of which Signage shall conform to Landlord’s design criteria and standards for the Project. For any Signage, Tenant shall, at Tenant’s own cost and expense (subject to the availability of the TI Allowance as provided in Section 4.4), (a) acquire all permits for such Signage in compliance with Applicable Laws and (b) design, fabricate, install and maintain such Signage in a first-class condition. Tenant shall be responsible for reimbursing Landlord for costs incurred by Landlord in removing any of Tenant’s Signage upon the expiration or earlier termination of the Lease. Interior signs on doors and the directory tablet shall be inscribed, painted or affixed for Tenant by Landlord at Tenant’s sole cost and expense, and shall be of a size, color and type and be located in a place acceptable to Landlord. The directory tablet shall be provided exclusively for the display of the name and location of tenants only. Tenant shall not place anything on the exterior of the corridor walls or corridor doors other than Landlord’s standard lettering. At Landlord’s option subject to Tenant’s reasonable approval, Landlord may install any Tenant Signage, and Tenant shall pay all costs associated with such installation within thirty (30) days after demand therefor.

12.8 Tenant shall only place equipment within the Premises with floor loading consistent with the Building’s structural design without Landlord’s prior written approval, and such equipment shall be placed in a location designed to carry the weight of such equipment.

12.9 Tenant shall cause any equipment or machinery to be installed in the Premises so as to reasonably prevent sounds or vibrations therefrom from extending into the Common Areas or other offices in the Project.

12.10 Tenant shall not (a) do or permit anything to be done in or about the Premises that shall in any way unreasonably obstruct or interfere with the rights of other tenants or occupants of the Project, or injure or annoy them, (b) use or allow the Premises to be used for unlawful

purposes, (c) cause, maintain or permit any nuisance or waste in, on or about the Project or (d) take any other action that would in Landlord’s reasonable determination in any manner adversely affect other tenants’ quiet use and enjoyment of their space or adversely impact their ability to conduct business in a professional and suitable work environment for uses similar to those permitted under this Lease.

12.11 Notwithstanding any other provision herein to the contrary, Tenant shall be responsible for all liabilities, costs and expenses arising out of or in connection with the compliance of the Premises with the Americans with Disabilities Act, 42 U.S.C. § 12101, et seq., and any state and local accessibility laws, codes, ordinances and rules (collectively, and together with regulations promulgated pursuant thereto, the “ADA”), and Tenant shall indemnify, save, defend (at Landlord’s option and with counsel reasonably acceptable to Landlord) and hold Landlord and its affiliates, employees, agents and contractors; and any lender, mortgagee or beneficiary (each, a “Lender” and, collectively with Landlord and its affiliates, employees, agents and contractors, the “Landlord Indemnitees”) harmless from and against any demands, claims, liabilities, losses, costs, expenses, actions, causes of action, damages or judgments, and all reasonable expenses (including reasonable attorneys’ fees, charges and disbursements) incurred in investigating or resisting the same (collectively, “Claims”) arising out of any such failure of the Premises to comply with the ADA; provided Tenant shall not be required to indemnify Landlord or be responsible for the cost to remediate Hazardous Materials, except to the extent Tenant is responsible or liable for such remediation pursuant to Article 21. Tenant shall perform, at its sole cost and expense, any changes to the Premises required by the ADA after the Term Commencement Date (unless required due to non-compliance existing as of the Term Commencement Date); provided that Landlord shall perform and pay for any such changes in the Premises that constitute a change to a Building system that extends into other tenants’ premises (e.g., Building sprinkler systems). The provisions of this Section shall survive the expiration or earlier termination of this Lease.

12.12 Subject to all other provisions of this Lease, Tenant shall have the right to continuous access to the Premises twenty-four (24) hours per day, seven (7) days per week, except during reasonable closures for repairs or maintenance pursuant to the terms of this Lease, or as the result of casualty or other circumstances beyond Landlord’s control.

13. Rules and Regulations, CC&Rs, Parking Facilities and Common Areas.

13.1 Tenant shall, at no additional cost during the Term, have the non-exclusive right, in common with others, to use the Common Areas, subject to the rules and regulations adopted by Landlord and attached hereto as Exhibit F. together with such other reasonable and nondiscriminatory rules and regulations as are hereafter promulgated by Landlord in its sole and absolute discretion (the “Rules and Regulations”). Tenant shall faithfully observe and comply with the Rules and Regulations. Landlord shall not be responsible to Tenant for the violation or non-performance by any other tenant or any agent, employee or invitee thereof of any of the Rules and Regulations.

13.2 This Lease is subject to any recorded covenants, conditions or restrictions on the Project or Property (the “CC&Rs”). as the same may be amended, amended and restated, supplemented or otherwise modified from time to time; provided that any such amendments,

restatements, supplements or modifications do not materially modify Tenant’s rights or obligations hereunder. Tenant shall comply with the CC&Rs.

13.3 Tenant, at no additional cost during the Term, shall have a non-exclusive, irrevocable license to use Tenant’s Pro Rata Share of parking facilities serving the Project in common on an unreserved basis with other tenants of the Project during the Term.

13.4 Tenant agrees not to unreasonably overburden the parking facilities and agrees to cooperate with Landlord and other tenants in the use of the parking facilities. Landlord reserves the right to determine that parking facilities are becoming overcrowded and to limit Tenant’s use thereof (provided that in no event shall Tenant be limited to less than Tenant’s Pro Rata Share of parking spaces). Upon such determination, Landlord may reasonably allocate parking spaces among Tenant and other tenants of the Building or the Project. Nothing in this Section, however, is intended to create an affirmative duty on Landlord’s part to monitor parking.

13.5 Landlord reserves the right to modify the Common Areas, including the right to add or remove exterior and interior landscaping and to subdivide real property. Tenant acknowledges that Landlord specifically reserves the right to allow the exclusive use of corridors and restroom facilities located on specific floors to one or more tenants occupying such floors; provided, however, that Tenant shall not be deprived of the use of the corridors reasonably required to serve the Premises or of restroom facilities serving the floor upon which the Premises are located.

14. Project Control by Landlord.

14.1 Landlord reserves full control over the Building and the Project to the extent not inconsistent with Tenant’s enjoyment of the Premises and does not diminish Tenant’s parking rights in the Common Areas as provided by this Lease. This reservation includes Landlord’s right to subdivide the Project; convert the Building to condominium units; change the size of the Project by selling all or a portion of the Project or adding real property and any improvements thereon to the Project; grant easements and licenses to third parties; maintain or establish ownership of the Building separate from fee title to the Property; make additions to or reconstruct portions of the Building and the Project; install, use, maintain, repair, replace and relocate for service to the Premises and other parts of the Building or the Project pipes, ducts, conduits, wires and appurtenant fixtures, wherever located in the Premises, the Building or elsewhere at the Project; and alter or relocate any other Common Area or facility, including private drives, lobbies and entrances.

14.2 Possession of areas of the Premises necessary for utilities, services, safety and operation of the Building is reserved to Landlord to the extent not inconsistent with Tenant’s enjoyment of the Premises.

14.3 Tenant shall, at Landlord’s request, promptly execute such further documents as may be reasonably appropriate to assist Landlord in the performance of its obligations hereunder; provided that Tenant need not execute any document that creates additional liability for Tenant or that deprives Tenant of the quiet enjoyment and use of the Premises or diminishes Tenant’s parking rights in the Common Areas as provided for in this Lease.

14.4 Landlord may, at any and all reasonable times during non-business hours (or during business hours if Tenant so requests), and upon twenty-four (24) hours’ prior notice (provided that no time restrictions shall apply or advance notice be required if an emergency necessitates immediate entry), enter the Premises to (a) inspect the same and to determine whether Tenant is in compliance with its obligations hereunder, (b) supply any service Landlord is required to provide hereunder, (c) show the Premises to prospective purchasers or tenants during the final year of the Term, (d) post notices of nonresponsibility, (e) access the telephone equipment, electrical substation and fire risers and (f) alter, improve or repair any portion of the Building other than the Premises for which access to the Premises is reasonably necessary. In connection with any such alteration, improvement or repair as described in Subsection 14.4(f). Landlord may erect in the Premises or elsewhere in the Project scaffolding and other structures reasonably required for the alteration, improvement or repair work to be performed. In no event shall Tenant’s Rent ▇▇▇▇▇ as a result of Landlord’s activities pursuant to this Section; provided, however, that all such activities shall be conducted in such a manner so as to cause as little interference to Tenant as is reasonably possible. Landlord shall at all times retain a key with which to unlock all of the doors in the Premises. If an emergency necessitates immediate access to the Premises, Landlord may use whatever force is necessary to enter the Premises, and any such entry to the Premises shall not constitute a forcible or unlawful entry to the Premises, a detainer of the Premises, or an eviction of Tenant from the Premises or any portion thereof.

15. Quiet Enjoyment. So long as Tenant is not in Default under this Lease, Landlord or anyone acting through or under Landlord shall not disturb Tenant’s occupancy of the Premises, except as permitted by this Lease,

16. Utilities and Services.

16.1 Tenant shall pay for all water (including the cost to service, repair and replace reverse osmosis, de-ionized and other treated water), gas, heat, light, power, telephone, internet service, cable television, other telecommunications and other utilities supplied to the Premises, together with any fees, surcharges and taxes thereon. If any such utility is not separately metered to Tenant, Tenant shall pay Tenant’s Share of all charges of such utility jointly metered with other premises as Additional Rent. To the extent that Tenant uses more than Tenant’s Pro Rata Share of any utilities, then Tenant shall pay Landlord for Tenant’s Share of such utilities to reflect such excess. In the event that the Building or Project is less than fully occupied, Tenant acknowledges that Landlord may extrapolate utility usage that vary depending on the occupancy of the Building or Project, as applicable, by dividing (a) the total cost of utility usage by (b) the Rentable Area of the Building or Project (as applicable) that is occupied, then multiplying (y) the resulting quotient by (z) one hundred percent (100%) of the total Rentable Area of the Building or Project (as applicable). Tenant shall pay Tenant’s Share of the product of (y) and (z), subject to adjustment based on actual usage as reasonably determined by Landlord; provided, however, that Landlord shall not recover more than one hundred percent (100%) of such utility costs. Further, in calculating utilities pursuant to the foregoing adjustment, Landlord will endeavor to ensure that any vacant space is not being supplied with utilities, or if vacant space is being supplied with utilities, then such space will be deemed “occupied” for purposes of the foregoing calculation.

16.2 Except as provided in this Section, Landlord shall not be liable for, nor shall any eviction of Tenant result from, the failure to furnish any utility or service, whether or not such failure is caused by accident; breakage; repair; strike, lockout or other labor disturbance or labor dispute of any character; act of terrorism; shortage of materials, which shortage is not unique to Landlord or Tenant, as the case may be; governmental regulation, moratorium or other governmental action, inaction or delay; or other causes beyond Landlord’s control (collectively, “Force Majeure”) or Landlord’s negligence. In the event of such failure, Tenant shall not be entitled to termination of this Lease or any abatement or reduction of Rent, nor shall Tenant be relieved from the operation of any covenant or agreement of this Lease, except as provided in Section 16.12.

16.3 Tenant shall pay for, prior to delinquency of payment therefor, any utilities and services that may be furnished to the Premises during or, if Tenant occupies the Premises after the expiration or earlier termination of the Term, after the Term, beyond those utilities provided by Landlord, including telephone, internet service, cable television and other telecommunications, together with any fees, surcharges and taxes thereon. Upon Landlord’s demand, utilities and services provided to the Premises that are separately metered shall be paid by Tenant directly to the supplier of such utilities or services.

16.4 Tenant shall not, without Landlord’s prior written consent, use any device in the Premises (including data processing machines) that will in any way (a) increase the amount of ventilation, air exchange, gas, steam, electricity or water required or consumed in the Premises based upon Tenant’s Pro Rata Share of the Building or Project (as applicable) beyond the existing capacity of the Building or the Project usually furnished or supplied for the use set forth in Section 2.7 or (b) exceed Tenant’s Pro Rata Share of the Building’s or Project’s (as applicable) capacity to provide such utilities or services. Nothing in this Section shall prohibit Tenant’s right to use any device commonly used for the Permitted Use, provided that such use doesn’t violate this Lease.

16.5 If Tenant shall require utilities or services in excess of those usually furnished or supplied for tenants in similar spaces in the Building or the Project by reason of Tenant’s equipment or extended hours of business operations, then Tenant shall first procure Landlord’s consent for the use thereof, which consent Landlord may condition upon the availability of such excess utilities or services, and Tenant shall pay as Additional Rent an amount equal to the cost of providing such excess utilities and services.

16.6 Upon Landlord’s demand, utilities and services provided to the Premises that are separately metered shall be paid by Tenant directly to the supplier of such utility or service.

16.7 Landlord shall provide water in Common Areas for lavatory purposes only, which water shall be from the local municipal or similar source; provided, however, that if Landlord determines that Tenant requires, uses or consumes water for any purpose other than ordinary lavatory purposes, Landlord may install a water meter and thereby measure Tenant’s water consumption for all purposes. Tenant shall pay Landlord for the costs of such meter and the installation thereof and, throughout the duration of Tenant’s occupancy of the Premises, Tenant shall keep said meter and installation equipment in good working order and repair at Tenant’s sole cost and expense. If Tenant fails to so maintain such meter and equipment, Landlord may

repair or replace the same and shall collect the costs therefor from Tenant. Tenant agrees to pay for water consumed, as shown on said meter, as and when bills are rendered. If Tenant fails to timely make such payments, Landlord may pay such charges and collect the same from Tenant. Any such costs or expenses incurred, or payments made by Landlord for any of the reasons or purposes hereinabove stated, shall be deemed to be Additional Rent payment by Tenant and collectible by Landlord as such.

16.8 Landlord reserves the right to stop service of the elevator, plumbing, ventilation, air conditioning and other utility systems, when Landlord deems necessary or desirable, due to accident, emergency or the need to make repairs, alterations or improvements, until such repairs, alterations or improvements shall have been completed, and (except as provided in Section 16.2). Landlord shall further have no responsibility or liability for failure to supply elevator facilities, plumbing, ventilation, air conditioning or other utility service when prevented from doing so by Force Majeure or Landlord’s negligence; a failure by a third party to deliver gas, oil or another suitable fuel supply; or Landlord’s inability by exercise of reasonable diligence to obtain gas, oil or another suitable fuel. Without limiting the foregoing, it is expressly understood and agreed that any covenants on Landlord’s part to furnish any service pursuant to any of the terms, covenants, conditions, provisions or agreements of this Lease, or to perform any act or thing for the benefit of Tenant, shall not be deemed breached if Landlord is unable to furnish or perform the same by virtue of Force Majeure or Landlord’s negligence. Landlord shall use commercially reasonable efforts (a) in exercising its rights pursuant to this Section in a manner so as to minimize or prevent interference with Tenant’s use of or access to the Premises, (b) to perform such repairs outside of normal business hours and (c) except in accident or emergency situations, to provide Tenant with prior written notice (email shall be deemed sufficient) in the event Landlord intends to stop service pursuant to this Section.

16.9 Currently, there is a back-up generator located outside the northwest corner of the Building (the “Generator”). Landlord shall connect the Generator to the Premises’ emergency electrical panel. Subject to power from the Generator dedicated to the Building, Tenant shall be entitled to use up to its proportionate share of the remaining power from the Generator on a non-exclusive basis with other tenants in the Building. The cost of maintaining, repairing and replacing the Generator shall constitute Operating Expenses. Landlord expressly disclaims any warranties with regard to the Generator or the installation thereof, including any warranty of merchantability or fitness for a particular purpose. Landlord shall maintain the Generator in good working condition, but shall not be liable for any failure to make any repairs or to perform any maintenance that is an obligation of Landlord unless such failure shall persist for an unreasonable time after Tenant provides Landlord with written notice of the need for such repairs or maintenance. The provisions of Section 16.2 shall apply to the Generator.

16.10 For the Premises, Landlord shall (a) maintain and operate the heating, ventilating and air conditioning systems used for the Permitted Use only (“HVAC”) and (b) subject to clause (a) above, furnish HVAC as reasonably required (except as this Lease otherwise provides) for reasonably comfortable occupancy of the Premises twenty-four (24) hours a day, every day during the Term, subject to casualty, eminent domain or as otherwise specified in this Article. Notwithstanding anything to the contrary in this Section (except as provided in Section 16.2). Landlord shall have no liability, and Tenant shall have no right or remedy, on account of any

interruption or impairment in HVAC services; provided that Landlord diligently endeavors to cure any such interruption or impairment.

16.11 Tenant shall retain records of utility usage at the Premises, including invoices and statements from the utility provider, for at least twelve (12) months and, upon request by Landlord, shall furnish such invoices and statements to Landlord. Tenant acknowledges that any utility information for the Premises, the Building and the Project may be shared with third parties, including Landlord’s consultants and Governmental Authorities. In the event that Tenant fails to comply with this Section, Tenant hereby authorizes Landlord, and shall also sign the appropriate documentation to allow Landlord, to collect utility usage information directly from the applicable utility providers.

16.12 In the event that Tenant is prevented from using, and does not use, the Premises or any material portion thereof for five (5) consecutive business days or after ten (10) non-consecutive business days within any twelve (12) month period during the Term (the “Eligibility Period”) as a result of (a) any failure by Landlord to provide to the Premises any of the essential utilities and services required to be provided in this Article, or (b) any failure by Landlord to provide access to the Premises, or (c) any failure by Landlord to perform any repairs required to be performed by Landlord under Section 18.1 below, within a reasonable time after Landlord has received notice from Tenant of the need for such repairs, but in no event longer than thirty (30) days (or such longer period of time as is reasonably required for such repair work if Landlord diligently commences such repair work within such thirty (30) day period and thereafter diligently prosecutes same to completion), or (d) any renovations of the Building undertaken by Landlord pursuant to Section 14.1, then Tenant’s obligation to pay Base Rent and Tenant’s Pro Rata Share of Operating Expenses shall be abated or reduced, as the case may be, from and after the first (1^st) day following the Eligibility Period and continuing until such time that Tenant continues to be so prevented from using, and does not use, the Premises or a portion thereof, in the proportion that the square feet of Rentable Area of the portion of the Premises that Tenant is prevented from using and does not use bears to the total square feet of Rentable Area of the Premises; provided, however, that Tenant shall only be entitled to such abatement to the extent that the matter described in clause (a), (b), (c) or (d) above arises out of or results from a matter within Landlord’s reasonable control. To the extent Tenant shall be entitled to abatement because of damage or destruction pursuant to Article 24 or a taking pursuant to Article 25, then the terms of this Section 16.12 shall not be applicable thereto.

17. Alterations.

17.1 Tenant shall make no alterations, additions or improvements in or to the Premises or engage in any construction, demolition, reconstruction, renovation, or other work (whether major or minor) of any kind in, at, or serving the Premises (“Alterations”) without Landlord’s prior written approval, which approval Landlord shall not unreasonably withhold; provided, however, that in the event any proposed Alteration affects (a) any structural portions of the Building, including exterior walls, roof, foundation, foundation systems (including barriers and subslab systems), or core of the Building, (b) the exterior of the Building or (c) any Building systems, including elevator, plumbing, air conditioning, heating, electrical, security, life safety and power, then Landlord may withhold its approval with respect thereto in its sole and absolute

discretion. Tenant shall, in making any such Alterations, use only those architects, contractors, suppliers and mechanics of which Landlord has given prior written approval, which approval shall be in Landlord’s sole and absolute discretion. In seeking Landlord’s approval, Tenant shall provide Landlord, at least fourteen (14) days in advance of any proposed construction, with plans, specifications, bid proposals, certified stamped engineering drawings and calculations by Tenant’s engineer of record or architect of record (including connections to the Building’s structural system, modifications to the Building’s envelope, non-structural penetrations in slabs or walls, and modifications or tie-ins to life safety systems), work contracts, requests for laydown areas and such other information concerning the nature and cost of the Alterations as Landlord may reasonably request. In no event shall Tenant use or Landlord be required to approve any architects, consultants, contractors, subcontractors or material suppliers that Landlord reasonably believes could cause labor disharmony. Notwithstanding the foregoing, Tenant may make strictly cosmetic changes to the Premises (“Cosmetic Alterations”) without Landlord’s consent; provided that (y) the cost of any Cosmetic Alterations does not exceed Fifty Thousand Dollars ($50,000) in any one instance or One Hundred Thousand Dollars ($100,000) annually, (z) such Cosmetic Alterations do not (i) require any structural or other substantial modifications to the Premises, (ii) require any changes to, or adversely affect, the Building systems, (iii) affect the exterior of the Building or (iv) trigger any requirement under Applicable Laws that would require Landlord to make any alteration or improvement to the Premises, the Building or the Project. Tenant shall give Landlord at least ten (10) days’ prior written notice of any Cosmetic Alterations.

17.2 Tenant shall not construct or permit to be constructed partitions or other obstructions that might interfere with free access to mechanical installation or service facilities of the Building or with other tenants’ components located within the Building, or interfere with the moving of Landlord’s equipment to or from the enclosures containing such installations or facilities.

17.3 Tenant shall accomplish any work performed on the Premises or the Building in such a manner as to permit any life safety systems to remain fully operable at all times.

17.4 Any work performed on the Premises, the Building or the Project by Tenant or Tenant’s contractors shall be done at such times and in such manner as Landlord may from time to time designate. Tenant covenants and agrees that all work done by Tenant or Tenant’s contractors shall be performed in full compliance with Applicable Laws. Within thirty (30) days after completion of any Alterations, Tenant shall provide Landlord with complete “as-built” drawing print sets and electronic CADD files on disc (or files in such other current format in common use as Landlord reasonably approves or requires) showing any changes in the Premises.

17.5 Before commencing any Alterations, Tenant shall give Landlord at least fourteen (14) days’ prior written notice of the proposed commencement of such work and if the cost of such Alterations is expected to exceed One Hundred Thousand Dollars ($100,000), Tenant shall, if required by Landlord, secure, at Tenant’s own cost and expense, a completion and lien indemnity bond satisfactory to Landlord for said work.

17.6 All Alterations, attached equipment, decorations, fixtures, movable laboratory casework and related appliances, trade fixtures, additions and improvements attached to or built

into the Premises and paid for and installed by Tenant (collectively, “Tenant Equipment”), shall (unless, prior to such construction or installation, the parties agree otherwise) remain the property of Tenant upon the expiration or earlier termination of the Term, and Tenant shall remove such Tenant Equipment from the Premises and repair and restore the Premises to its original condition as of the applicable Term Commencement Date. The Premises shall at all times remain the property of Landlord and shall be surrendered to Landlord upon the expiration or earlier termination of this Lease. All Tenant Improvements, Alterations, attached equipment, decorations, fixtures, movable laboratory casework and related appliances, trade fixtures, additions and improvements attached to or built into the Premises, and paid for, or installed by, Landlord and any Signage shall be the property of Landlord, shall not be moved by Tenant at any time during the Term and shall be surrendered with the Premises as a part thereof.

17.7 Tenant shall repair any damage to the Premises caused by Tenant’s removal of any property (including Tenant Equipment) from the Premises. During any such restoration period, Tenant shall pay Rent to Landlord as provided herein as if said space were otherwise occupied by Tenant. The provisions of this Section shall survive the expiration or earlier termination of this Lease.

17.8 If Tenant shall fail to remove any of its effects from the Premises prior to termination of this Lease, then Landlord may, at its option, remove the same in any manner that Landlord shall choose and store said effects without liability to Tenant for loss thereof or damage thereto, and Tenant shall pay Landlord, upon demand, any costs and expenses incurred due to such removal and storage or Landlord may, at its sole option and without notice to Tenant, sell such property or any portion thereof at private sale and without legal process for such price as Landlord may obtain and apply the proceeds of such sale against any (a) amounts due by Tenant to Landlord under this Lease and (b) any expenses incident to the removal, storage and sale of said personal property.

17.9 Notwithstanding any other provision of this Article to the contrary, in no event shall Tenant remove any improvement from the Premises as to which Landlord contributed payment, including the Tenant Improvements, without Landlord’s prior written consent, which consent Landlord may withhold in its sole and absolute discretion.

17.10 To the extent Alterations require Landlord’s plan review, coordination, scheduling or supervision thereof, Tenant shall pay to Landlord an amount equal to three percent (3%) of the cost to Tenant of all Alterations exceeding One Hundred Thousand Dollars ($100,000) per occurrence (but specifically excluding Cosmetic Alterations and any work related to installation of Tenant’s equipment and trade fixtures) installed by Tenant or its contractors or agents to cover Landlord’s overhead and expenses for plan review, coordination, scheduling and supervision thereof; provided, however, that, in the event Landlord (in its reasonable discretion) does not perform any plan review, coordination, scheduling or supervision of such Alterations, then Tenant shall not be required to pay such fee. For purposes of payment of such sum, Tenant shall submit to Landlord copies of all bills, invoices and statements covering the costs of such charges, accompanied by payment to Landlord of the fee set forth in this Section. Tenant shall reimburse Landlord for any extra expenses incurred by Landlord by reason of faulty work done

by Tenant or its contractors, or by reason of delays caused by such work, or by reason of inadequate clean-up.

17.11 Within sixty (60) days after final completion of the Tenant Improvements (or any other Alterations performed by Tenant with respect to the Premises), Tenant shall submit to Landlord documentation showing the amounts expended by Tenant with respect to such Tenant Improvements (or any other Alterations performed by Tenant with respect to the Premises), together with supporting documentation reasonably acceptable to Landlord.

17.12 Tenant shall take, and shall cause its contractors to take, commercially reasonable steps to protect the Premises during the performance of any Alterations, including covering or temporarily removing any window coverings so as to guard against dust, debris or damage.

17.13 Tenant shall require its contractors and subcontractors performing work on the Premises to name Landlord and its affiliates and Lenders as additional insureds on their respective insurance policies.

18. Repairs and Maintenance.

18.1 Landlord shall repair and maintain the structural and exterior portions and Common Areas of the Building and the Project, including roofing and covering materials; foundations; exterior walls; plumbing; fire sprinkler systems (if any); heating, ventilating, air conditioning systems; elevators; and electrical systems installed or furnished by Landlord.

18.2 Except for services of Landlord, if any, required by Section 18.1, Tenant shall at Tenant’s sole cost and expense maintain and keep the Premises and every part thereof in good condition and repair, damage thereto from ordinary wear and tear excepted. Tenant shall, upon the expiration or sooner termination of the Term, surrender the Premises to Landlord in as good a condition as when received, ordinary wear and tear excepted; and shall, at Landlord’s request, remove all telephone and data systems, wiring and equipment from the Premises which was installed by or on behalf of Tenant or at Tenant’s request, including the Tenant Improvements, and repair any damage to the Premises caused thereby. Landlord shall have no obligation to alter, remodel, improve, repair, decorate or paint the Premises or any part thereof, other than pursuant to the terms and provisions of the Work Letter.

18.3 Except as provided in Section 16.2, Landlord shall not be liable for any failure to make any repairs or to perform any maintenance that is an obligation of Landlord unless such failure shall persist for an unreasonable time after Tenant provides Landlord with written notice of the need of such repairs or maintenance. Tenant waives its rights under Applicable Laws now or hereafter in effect to make repairs at Landlord’s expense.

18.4 If any excavation shall be made upon land adjacent to or under the Building, or shall be authorized to be made, Tenant shall afford to the person causing or authorized to cause such excavation, license to enter the Premises for the purpose of performing such work as said person shall deem necessary or desirable to preserve and protect the Building from injury or damage and to support the same by proper foundations, without any claim for damages or liability against Landlord and without reducing or otherwise affecting Tenant’s obligations under

this Lease. Landlord shall use commercially reasonable efforts in conducting any such work to minimize or prevent interference with Tenant’s use of or access to the Premises.

18.5 This Article relates to repairs and maintenance arising in the ordinary course of operation of the Building and the Project. In the event of a casualty described in Article 24, Article 24 shall apply in lieu of this Article. In the event of eminent domain, Article 25 shall apply in lieu of this Article.

18.6 Costs incurred by Landlord pursuant to this Article shall constitute Operating Expenses (but only to the extent includable in the definition of Operating Expenses), unless such costs are incurred due in whole or in part to any act, neglect, fault or omissions of Tenant or its employees, agents, contractors or invitees, in which case Tenant shall pay to Landlord the cost of such repairs and maintenance.

19. Liens.

19.1 Subject to the immediately succeeding sentence, Tenant shall keep the Premises, the Building and the Project free from any liens arising out of work performed, materials furnished or obligations incurred by Tenant. Tenant further covenants and agrees that any mechanic’s lien filed against the Premises, the Building or the Project for work claimed to have been done for, or materials claimed to have been furnished to, shall be discharged or bonded by Tenant within ten (10) days after the filing thereof, at Tenant’s sole cost and expense; provided that Tenant shall not be responsible for any liens resulting from the Tenant Improvements installed by Landlord pursuant to the Work Letter.

19.2 Should Tenant fail to discharge or bond against any lien of the nature described in Section 19.1, Landlord may, at Landlord’s election, pay such claim or post a bond or otherwise provide security to eliminate the lien as a claim against title, and Tenant shall immediately reimburse Landlord for the costs thereof as Additional Rent. Tenant shall indemnify, save, defend (at Landlord’s option and with counsel reasonably acceptable to Landlord) and hold the Landlord Indemnitees harmless from and against any Claims arising from any such liens, including any administrative, court or other legal proceedings related to such liens.

19.3 In the event that Tenant leases or finances the acquisition of office equipment, furnishings or other personal property of a removable nature utilized by Tenant in the operation of Tenant’s business, Tenant warrants that any Uniform Commercial Code financing statement shall, upon its face or by exhibit thereto, indicate that such financing statement is applicable only to removable personal property of Tenant located within the Premises. In no event shall the address of the Premises, the Building or the Project be furnished on a financing statement without qualifying language as to applicability of the lien only to removable personal property located in an identified suite leased by Tenant. Should any holder of a financing statement record or place of record a financing statement that appears to constitute a lien against any interest of Landlord or against equipment that may be located other than within an identified suite leased by Tenant, Tenant shall, within ten (10) days after filing such financing statement, cause (a) a copy of the Lender security agreement or other documents to which the financing statement pertains to be furnished to Landlord to facilitate Landlord’s ability to demonstrate that the lien of such financing statement is not applicable to Landlord’s interest and (b) Tenant’s

Lender to amend such financing statement and any other documents of record to clarify that any liens imposed thereby are not applicable to any interest of Landlord in the Premises, the Building or the Project.

20. Estoppel Certificate. Tenant shall, within ten (10) days of receipt of written notice from Landlord, execute, acknowledge and deliver a statement in writing substantially in the form attached to this Lease as Exhibit G, or on any other form reasonably requested by a proposed Lender or purchaser, (a) certifying that this Lease is unmodified and in full force and effect (or, if modified, stating the nature of such modification and certifying that this Lease as so modified is in full force and effect) and the dates to which rental and other charges are paid in advance, if any, (b) acknowledging that there are not, to Tenant’s knowledge, any uncured defaults on the part of Landlord hereunder, or specifying such defaults if any are claimed, and (c) setting forth such further information with respect to this Lease or the Premises as may be requested thereon. Any such statement may be relied upon by any prospective purchaser or encumbrancer of all or any portion of the real property of which the Premises are apart. Tenant’s failure to deliver such statement within such the prescribed time shall, at Landlord’s option, constitute a Default (as defined below) under this Lease, and, in any event, shall be binding upon Tenant that the Lease is in full force and effect and without modification except as may be represented by Landlord in any certificate prepared by Landlord and delivered to Tenant for execution.

21. Hazardous Materials.

21.1 Tenant shall not cause or permit any Hazardous Materials (as defined below) to be brought upon, kept or used in or about the Premises, the Building or the Project in violation of Applicable Laws by Tenant or its employees, agents, contractors or invitees. If Tenant breaches such obligation, or if the presence of Hazardous Materials as a result of such a breach results in contamination of the Project, any portion thereof, or any adjacent property, or if contamination of the Project, any portion thereof, or any adjacent property by Hazardous Materials otherwise occurs during the Term or any extension or renewal hereof or holding over hereunder (other than if such contamination results from (a) migration of Hazardous Materials from outside the Premises caused by Tenant or its employees, agents, contractors or invitees, or (b) to the extent such contamination is solely caused by Landlord’s gross negligence or willful misconduct, then Tenant shall indemnify, save, defend (at Landlord’s option and with counsel reasonably acceptable to Landlord) and hold the Landlord Indemnitees harmless from and against any and all Claims, including (a) diminution in value of the Project or any portion thereof, (b) damages for the loss or restriction on use of rentable or usable space or of any amenity of the Project, (c) damages arising from any adverse impact on marketing of space in the Project or any portion thereof and (d) sums paid in settlement of Claims that arise during or after the Term as a result of such breach or contamination. This indemnification by Tenant includes costs incurred in connection with any investigation of site conditions or any clean-up, remedial, removal or restoration work required by any Governmental Authority because of Hazardous Materials present in the air, soil or groundwater above, on or under or about the Project. Without limiting the foregoing, if the presence of any Hazardous Materials in, on, under or about the Project, any portion thereof or any adjacent property caused or permitted by Tenant results in any contamination of the Project, any portion thereof or any adjacent property, then Tenant shall promptly take all actions at its sole cost and expense as are necessary to return the Project, any

portion thereof or any adjacent property to its respective condition existing prior to the time of such contamination; provided that Landlord’s written approval of such action shall first be obtained, which approval Landlord shall not unreasonably withhold; and provided, further, that it shall be reasonable for Landlord to withhold its consent if such actions could have a material adverse long-term or short-term effect on the Project, any portion thereof or any adjacent property. Notwithstanding the foregoing, Landlord shall indemnify, save, defend (at Tenant’s option and with counsel reasonably acceptable to Tenant) and hold Tenant and its affiliates, employees, agents and contractors harmless from and against any and all Claims resulting from the presence of Hazardous Materials at the Project in violation of Applicable Laws as of the Execution Date, unless placed at the Project by Tenant or its affiliates, employees, agents or contractors.

21.2 Landlord acknowledges that it is not the intent of this Article to prohibit Tenant from operating its business for the Permitted Use. Tenant may operate its business according to the custom of Tenant’s industry so long as the use or presence of Hazardous Materials is strictly and properly monitored in accordance with Applicable Laws. As a material inducement to Landlord to allow Tenant to use Hazardous Materials in connection with its business, Tenant agrees to deliver to Landlord prior to the applicable Term Commencement Date a list identifying each type of Hazardous Material to be present at the Project and setting forth any and all governmental approvals or permits required in connection with the presence of such Hazardous Material at the Project (the “Hazardous Materials List”). Tenant shall deliver to Landlord an updated Hazardous Materials List on or prior to each annual anniversary of the Phase 1 Term Commencement Date and shall also deliver an updated Hazardous Materials List before any new Hazardous Materials are brought to the Project. Tenant shall deliver to Landlord true and correct copies of the following documents (hereinafter referred to as the “Documents”) relating to the handling, storage, disposal and emission of Hazardous Materials prior to the Phase 1 Term Commencement Date or, if unavailable at that time, concurrently with the receipt from or submission to any Governmental Authority: permits; approvals; reports and correspondence; storage and management plans; notices of violations of Applicable Laws; plans relating to the installation of any storage tanks to be installed in, on, under or about the Project (provided that installation of storage tanks shall only be permitted after Landlord has given Tenant its written consent to do so, which consent Landlord may withhold in its sole and absolute discretion); and all closure plans or any other documents required by any and all Governmental Authorities for any storage tanks installed in, on, under or about the Project for the closure of any such storage tanks. Tenant shall not be required, however, to provide Landlord with any portion of the Documents containing information of a proprietary nature, which Documents, in and of themselves, do not contain a reference to any Hazardous Materials or activities related to Hazardous Materials.

21.3 [Intentionally Omitted]

21.4 At any time, and from time to time, prior to the expiration of the Term, Landlord shall have the right to conduct appropriate tests of the Project or any portion thereof to demonstrate that Hazardous Materials are present or that contamination has occurred due to Tenant or Tenant’s employees, agents, contractors or invitees. Tenant shall pay all reasonable

costs of such tests if such tests reveal that Hazardous Materials exist at the Project in violation of this Lease.

21.5 If underground or other storage tanks storing Hazardous Materials are located on the Premises or are hereafter placed on the Premises by any party, Tenant shall monitor the storage tanks, maintain appropriate records, implement reporting procedures, properly close any underground storage tanks, and take or cause to be taken all other steps necessary or required under the Applicable Laws.

21.6 Tenant shall promptly report to Landlord any actual or suspected presence of mold or water intrusion at the Premises.

21.7 Tenant’s obligations under this Article shall survive the expiration or earlier termination of the Lease. During any period of time needed by Tenant or Landlord after the termination of this Lease to complete the removal from the Premises of any such Hazardous Materials, Tenant shall be deemed a holdover tenant and subject to the provisions of Article 27 below.

21.8 As used herein, the term “Hazardous Material” means any hazardous or toxic substance, material or waste that is or becomes regulated by any Governmental Authority.

21.9 Notwithstanding anything to the contrary in this Lease, Landlord shall have sole control over the equitable allocation of fire control areas (as defined in the Uniform Building Code as adopted by the city or municipality(ies) in which the Project is located (the “UBC”)) within the Project for the storage of Hazardous Materials. Notwithstanding anything to the contrary in this Lease, the quantity of Hazardous Materials allowed by this Section 21.9 is specific to Tenant and shall not run with the Lease in the event of a Transfer (as defined in Article 29). In the event of a Transfer, if the use of Hazardous Materials by such new tenant (“New Tenant”) is such that New Tenant utilizes fire control areas in the Project in excess of New Tenant’s Pro Rata Share of the Building or the Project, as applicable, then New Tenant shall, at its sole cost and expense and upon Landlord’s written request, establish and maintain a separate area of the Premises classified by the UBC as an “H” occupancy area for the use and storage of Hazardous Materials, or take such other action as is necessary to ensure that its share of the fire control areas of the Building and the Project is not greater than New Tenant’s Pro Rata Share of the Building or the Project, as applicable.

22. Odors and Exhaust. Tenant acknowledges that Landlord would not enter into this Lease with Tenant unless Tenant assured Landlord that under no circumstances will any other occupants of the Building or the Project (including persons legally present in any outdoor areas of the Project) be subjected to odors or fumes (whether or not noxious), and that the Building and the Project will not be damaged by any exhaust, in each case from Tenant’s operations, including in Tenant’s vivarium. Landlord and Tenant therefore agree as follows:

22.1 Tenant shall not cause or permit (or conduct any activities that would cause) any release of any odors or fumes of any kind from the Premises.

22.2 If the Building has a ventilation system that, in Landlord’s judgment, is adequate, suitable, and appropriate to vent the Premises in a manner that does not release odors affecting any indoor or outdoor part of the Project, Tenant shall vent the Premises through such system. If Landlord at any time determines that any existing ventilation system is inadequate, or if no ventilation system exists, Tenant shall in compliance with Applicable Laws vent all fumes and odors from the Premises (and remove odors from Tenant’s exhaust stream) as Landlord reasonably requires. The placement and configuration of all ventilation exhaust pipes, louvers and other equipment shall be subject to Landlord’s approval. Tenant acknowledges Landlord’s legitimate desire to maintain the Project (indoor and outdoor areas) in an odor-free manner, and Landlord may require Tenant to ▇▇▇▇▇ and remove all odors in a manner that goes beyond the requirements of Applicable Laws.

22.3 Tenant shall, at Tenant’s sole cost and expense, provide odor eliminators and other devices (such as filters, air cleaners, scrubbers and whatever other equipment may in Landlord’s judgment be necessary or appropriate from time to time) to completely remove, eliminate and ▇▇▇▇▇ any odors, fumes or other substances in Tenant’s exhaust stream that, in Landlord’s judgment, emanate from Tenant’s Premises. Any work Tenant performs under this Section shall constitute Alterations.

22.4 Tenant’s responsibility to remove, eliminate and ▇▇▇▇▇ odors, fumes and exhaust shall continue throughout the Term. Landlord’s approval of the Tenant Improvements shall not preclude Landlord from requiring additional measures to eliminate odors, fumes and other adverse impacts of Tenant’s exhaust stream (as Landlord may designate in Landlord’s discretion). Tenant shall install additional equipment as Landlord requires from time to time under the preceding sentence. Such installations shall constitute Alterations.

22.5 If Tenant fails to install satisfactory odor control equipment within ten (10) business days after Landlord’s demand made at any time, then Landlord may, without limiting Landlord’s other rights and remedies, require Tenant to cease and suspend any operations in the Premises that, in Landlord’s determination, cause odors, fumes or exhaust. For example, if Landlord determines that Tenant’s production of a certain type of product causes odors, fumes or exhaust, and Tenant does not install satisfactory odor control equipment within ten (10) business days after Landlord’s request, then Landlord may require Tenant to stop producing such type of product in the Premises unless and until Tenant has installed odor control equipment satisfactory to Landlord.

23. Insurance; Waiver of Subrogation.

23.1 Landlord shall maintain insurance for the Building and the Project in amounts equal to full replacement cost (exclusive of the costs of excavation, foundations and footings, and without reference to depreciation taken by Landlord upon its books or tax returns) or such lesser coverage as Landlord may elect, provided that such coverage shall not be less than ninety percent (90%) of such full replacement cost or the amount of such insurance Landlord’s Lender, if any, requires Landlord to maintain, providing protection against any peril generally included within the classification “Fire and Extended Coverage,” together with insurance against sprinkler damage (if applicable), vandalism and malicious mischief. Landlord, subject to availability thereof, shall further insure, if Landlord deems it appropriate, coverage against flood,

environmental hazard, earthquake, loss or failure of building equipment, rental loss during the period of repairs or rebuilding, workmen’s compensation insurance and fidelity bonds for employees employed to perform services. Notwithstanding the foregoing, Landlord may, but shall not be deemed required to, provide insurance for any improvements installed by Tenant or that are in addition to the standard improvements customarily furnished by Landlord, without regard to whether or not such are made a part of or are affixed to the Building.

23.2 In addition, Landlord shall carry public liability insurance with a single limit of not less than One Million Dollars ($1,000,000) for death or bodily injury, or property damage with respect to the Project.

23.3 Tenant shall, at its own cost and expense, procure and maintain in effect, beginning on the Phase 1 Term Commencement Date or the date of occupancy, whichever occurs first, and continuing throughout the Term (and occupancy by Tenant, if any, after termination of this Lease) comprehensive liability insurance with limits of not less than Two Million Dollars ($2,000,000) per occurrence for death or bodily injury and for property damage with respect to the Premises (including $ 100,000 fire legal liability (each loss)).

23.4 The insurance required to be purchased and maintained by Tenant pursuant to this Lease shall name Landlord, BioMed Realty, L.P., BioMed Realty Trust, Inc. and their respective officers, directors, employees, agents, general partners, members, subsidiaries, affiliates and Lenders (“Landlord Parties”) as additional insureds. Said insurance shall be with companies authorized to do business in the state in which the Project is located and having a rating of not less than policyholder rating of A and financial category rating of at least Class XII in “Best’s Insurance Guide.” Tenant shall obtain for Landlord from the insurance companies or cause the insurance companies to furnish certificates of coverage to Landlord. No such policy shall be cancelled or suffer a reduction of coverage or other modification or cancellation except after thirty (30) days’ prior written notice to Landlord (except in the event of non-payment of premium, in which case ten (10) days written notice shall be given). All such policies shall be written as primary policies, not contributing with and not in excess of the coverage that Landlord may carry. Tenant’s policy may be a “blanket policy” that specifically provides that the amount of insurance shall not be prejudiced by other losses covered by the policy. Tenant shall, at least twenty (20) days prior to the expiration of such policies, furnish Landlord with renewals or binders. Tenant agrees that if Tenant does not take out and maintain such insurance, Landlord may (but shall not be required to) procure said insurance on Tenant’s behalf and at its cost to be paid by Tenant as Additional Rent.

23.5 Tenant assumes the risk of damage to any fixtures, goods, inventory, merchandise, equipment and leasehold improvements, and Landlord shall not be liable for injury to Tenant’s business or any loss of income therefrom, relative to such damage, all as more particularly set forth within this Lease. Tenant shall, at Tenant’s sole cost and expense, carry such insurance as Tenant desires for Tenant’s protection with respect to personal property of Tenant or business interruption.

23.6 In each instance where insurance is to name Landlord Parties as additional insureds, Tenant shall, upon Landlord’s written request, also designate and furnish certificates evidencing such Landlord Parties as additional insureds to (a) any Lender of Landlord holding a

security interest in the Building, the Property or the Project, (b) the landlord under any lease whereunder Landlord is a tenant of the Property if the interest of Landlord is or shall become that of a tenant under a ground lease rather than that of a fee owner and (c) any management company retained by Landlord to manage the Project.

23.7 Landlord and Tenant each hereby waive any and all rights of recovery against the other or against the officers, directors, employees, agents, general partners, members, subsidiaries, affiliates and Lenders of the other on account of loss or damage occasioned by such waiving party or its property or the property of others under such waiving party’s control, in each case to the extent that such loss or damage is insured against under any fire and extended coverage insurance policy that either Landlord or Tenant may have in force at the time of such loss or damage, or would be insured against under any fire and extended coverage insurance policy that either Landlord or Tenant is required to obtain under this Lease. Landlord and Tenant, upon obtaining the policies of insurance required or permitted under this Lease, shall give notice to the insurance carrier or carriers that the foregoing mutual waiver of subrogation is contained in this Lease. If the release of either Landlord or Tenant, as set forth in the first sentence of this Section, shall contravene Applicable Laws, then the liability of the party in question shall be deemed not released but shall be secondary to the other party’s insurer.

23.8 Landlord may require insurance policy limits required under this Lease to be raised to conform with reasonable requirements of Landlord’s Lender or to bring coverage limits to levels then being reasonably required of new tenants within the Project.

23.9 Any costs incurred by Landlord pursuant to this Article shall constitute a portion of Operating Expenses (but only to the extent includable in the definition of Operating Expenses).

24. Damage or Destruction.

24.1 In the event of a partial destruction of (a) the Premises or (b) Common Areas of the Building or the Project ((a) and (b) together, the “Affected Areas”) by fire or other perils covered by extended coverage insurance not exceeding twenty-five percent (25%) of the full insurable value thereof, and provided that (x) the damage thereto is such that the Affected Areas may be repaired, reconstructed or restored within a period of six (6) months from the date of the happening of such casualty, (y) Landlord shall receive insurance proceeds sufficient to cover the cost of such repairs (except for any deductible amount provided by Landlord’s policy, which deductible amount, if paid by Landlord, shall constitute an Operating Expense) and (z) such casualty was not intentionally caused by Tenant or its employees, agents or contractors, then Landlord shall commence and proceed diligently with the work of repair, reconstruction and restoration of the Affected Areas and this Lease shall continue in full force and effect.

24.2 In the event of any damage to or destruction of the Building or the Project other than as described in Section 24.1, Landlord may elect to repair, reconstruct and restore the Building or the Project, as applicable, in which case this Lease shall continue in full force and effect. If Landlord elects not to repair the Building or the Project, as applicable, then this Lease shall terminate as of the date of such damage or destruction.

24.3 Landlord shall give written notice to Tenant within sixty (60) days following the date of damage or destruction of its election either to repair or not to repair, reconstruct or restore the Building or the Project, as applicable; provided, however, that (a) if Landlord does not elect to terminate this Lease pursuant to Landlord’s termination right as provided above, and (b) the repair of such damage to the Premises cannot, in the reasonable opinion of Landlord, be completed within nine (9) months after the date of the damage, then Tenant may elect to terminate this Lease by delivering written notice thereof to Landlord within fifteen (15) days after being notified by Landlord of the estimated length of time to repair the damage and destruction, which termination shall be effective as of the date of such termination notice thereof to Landlord.

24.4 Upon any termination of this Lease under any of the provisions of this Article, the parties shall be released thereby without further obligation to the other from the date possession of the Premises is surrendered to Landlord, except with regard to (a) items occurring prior to the damage or destruction and (b) provisions of this Lease that, by their express terms, survive the expiration or earlier termination hereof.

24.5 In the event of repair, reconstruction and restoration as provided in this Article, all Rent to be paid by Tenant under this Lease shall be abated proportionately based on the extent to which Tenant’s use of the Premises is impaired during the period of such repair, reconstruction or restoration, unless Landlord provides Tenant with other space during the period of repair that, in Tenant’s reasonable opinion, is suitable for the temporary conduct of Tenant’s business; provided, however, that the amount of such abatement shall be reduced by the proceeds of business interruption or loss of rental income insurance actually received by Tenant with respect to the Premises.

24.6 Notwithstanding anything to the contrary contained in this Article, should Landlord be delayed or prevented from completing the repair, reconstruction or restoration of the damage or destruction to the Premises after the occurrence of such damage or destruction by Force Majeure, then the time for Landlord to commence or complete repairs shall be extended on a day-for-day basis.

24.7 If Landlord is obligated to or elects to repair, reconstruct or restore as herein provided, then Landlord shall be obligated to make such repair, reconstruction or restoration only with regard to (a) those portions of the Premises that were originally provided at Landlord’s expense and (b) the Common Area portion of the Affected Areas. The repair, reconstruction or restoration of improvements not originally provided by Landlord or at Landlord’s expense shall be the obligation of Tenant. In the event Tenant has elected to upgrade certain improvements from the Building Standard, Landlord shall, upon the need for replacement due to an insured loss, provide only the Building Standard, unless Tenant again elects to upgrade such improvements and pay any incremental costs related thereto, except to the extent that excess insurance proceeds, if received, are adequate to provide such upgrades, in addition to providing for basic repair, reconstruction and restoration of the Premises, the Building and the Project.

24.8 Notwithstanding anything to the contrary contained in this Article, Landlord shall not have any obligation whatsoever to repair, reconstruct or restore the Premises if the damage resulting from any casualty covered under this Article occurs during the last twenty-four (24)

months of the Term or any extension thereof and it is estimated that the repair of such casualty would take more than ninety (90) days, or to the extent that insurance proceeds are not available therefor. In addition, Tenant also shall have the right to terminate this Lease if the damage resulting from any casualty covered under this Article occurs during the last twenty-four (24) months of the Term or any extension thereof and it is estimated that the repair of such casualty would take more than ninety (90) days.

24.9 Landlord’s obligation, should it elect or be obligated to repair or rebuild, shall be limited to the Affected Areas. Tenant shall, at its expense, replace or fully repair all of Tenant’s personal property and any Alterations installed by Tenant existing at the time of such damage or destruction. If Affected Areas are to be repaired in accordance with the foregoing, Landlord shall, subject to the requirements of any Lender of Landlord, make available to Tenant any portion of insurance proceeds it receives that are allocable to the Alterations constructed by Tenant pursuant to this Lease; provided Landlord shall not make such proceeds available to Tenant during the continuance of any default by Tenant under this Lease.

25. Eminent Domain.

25.1 In the event (a) the whole of all Affected Areas or (b) such part thereof as shall substantially interfere with Tenant’s use and occupancy of the Premises for the Permitted Use shall be taken for any public or quasi-public purpose by any lawful power or authority by exercise of the right of appropriation, condemnation or eminent domain, or sold to prevent such taking, Tenant or Landlord may terminate this Lease effective as of the date possession is required to be surrendered to said authority, except with regard to (y) items occurring prior to the damage or destruction and (z) provisions of this Lease that, by their express terms, survive the expiration or earlier termination hereof.

25.2 In the event of a partial taking of (a) the Building or the Project or (b) drives, walkways or parking areas serving the Building or the Project for any public or quasi-public purpose by any lawful power or authority by exercise of right of appropriation, condemnation, or eminent domain, or sold to prevent such taking, then, without regard to whether any portion of the Premises occupied by Tenant was so taken, Landlord may elect to terminate this Lease (except with regard to (a) items occurring prior to the damage or destruction and (b) provisions of this Lease that, by their express terms, survive the expiration or earlier termination hereof} as of such taking if such taking is, in Landlord’s sole opinion, of a material nature such as to make it uneconomical to continue use of the unappropriated portion for purposes of renting office or laboratory space.

25.3 Tenant shall be entitled to any award that is specifically awarded as compensation for (a) the taking of Tenant’s personal property that was installed at Tenant’s expense and (b) the costs of Tenant moving to a new location. Except as set forth in the previous sentence, any award for such taking shall be the property of Landlord.

25.4 If, upon any taking of the nature described in this Article, this Lease continues in effect, then Landlord shall promptly proceed to restore the Affected Areas to substantially their same condition prior to such partial taking. To the extent such restoration is infeasible, as

determined by Landlord in its sole and absolute discretion, the Rent shall be decreased proportionately to reflect the loss of any portion of the Premises no longer available to Tenant.

26. Surrender.

26.1 At least ten (10) days prior to Tenant’s surrender of possession of any part of the Premises, Tenant shall provide Landlord with (a) a facility decommissioning and Hazardous Materials closure plan for the Premises (“Exit Survey”) prepared by an independent third party reasonably acceptable to Landlord, and (b) written evidence of all appropriate governmental releases obtained by Tenant in accordance with Applicable Laws, including laws pertaining to the surrender of the Premises. In addition, Tenant agrees to remain responsible after the surrender of the Premises for the remediation of any recognized environmental conditions set forth in the Exit Survey and compliance with any recommendations set forth in the Exit Survey, but only to the extent such conditions or recommendations are the responsibility of Tenant pursuant to this Lease. Tenant’s obligations under this Section shall survive the expiration or earlier termination of the Lease.

26.2 No surrender of possession of any part of the Premises shall release Tenant from any of its obligations hereunder, unless such surrender is accepted in writing by Landlord.

26.3 The voluntary or other surrender of this Lease by Tenant shall not effect a merger with Landlord’s fee title or leasehold interest in the Premises, the Building, the Property or the Project, unless Landlord consents in writing, and shall, at Landlord’s option, operate as an assignment to Landlord of any or all subleases.

26.4 The voluntary or other surrender of any ground or other underlying lease that now exists or may hereafter be executed affecting the Building or the Project, or a mutual cancellation thereof or of Landlord’s interest therein by Landlord and its lessor shall not effect a merger with Landlord’s fee title or leasehold interest in the Premises, the Building or the Property and shall, at the option of the successor to Landlord’s interest in the Building or the Project, as applicable, operate as an assignment of this Lease.

27. Holding Over.

27.1 If, with Landlord’s prior written consent, Tenant holds possession of all or any part of the Premises after the Term, Tenant shall become a tenant from month to month after the expiration or earlier termination of the Term, and in such case Tenant shall continue to pay (a) Base Rent in accordance with Article 7, and (b) any amounts for which Tenant would otherwise be liable under this Lease if the Lease were still in effect, including payments for Tenant’s Share of Operating Expenses. Any such month-to-month tenancy shall be subject to every other term, covenant and agreement contained herein.

27.2 Notwithstanding the foregoing, if Tenant remains in possession of the Premises after the expiration or earlier termination of the Term without Landlord’s prior written consent, (a) Tenant shall become a tenant at sufferance subject to the terms and conditions of this Lease, except that the monthly rent shall be equal to one hundred fifty percent (150%) of the Rent in effect during the last thirty (30) days of the Term, and (b) Tenant shall be liable to Landlord for

any and all damages suffered by Landlord as a result of such holdover, including any lost rent or consequential, special and indirect damages.

27.3 Acceptance by Landlord of Rent after the expiration or earlier termination of the Term shall not result in an extension, renewal or reinstatement of this Lease.

27.4 The foregoing provisions of this Article are in addition to and do not affect Landlord’s right of reentry or any other rights of Landlord hereunder or as otherwise provided by Applicable Laws.

28. Indemnification and Exculpation.

28.1 Tenant agrees to indemnify, save, defend (at Landlord’s option and with counsel reasonably acceptable to Landlord) and hold the Landlord Indemnitees harmless from and against any and all Claims arising from injury or death to any person or damage to any property occurring within or about the Premises, the Building, the Property or the Project arising directly or indirectly out of Tenant’s or Tenant’s employees’, agents’, contractors’ or invitees’ use or occupancy of the Premises or a breach or default by Tenant in the performance of any of its obligations hereunder, except to the extent caused by Landlord’s negligence or willful misconduct.

28.2 Notwithstanding any provision of Section 28.1 to the contrary, Landlord shall not be liable to Tenant for, and Tenant assumes all risk of, damage to personal property or scientific research, including loss of records kept by Tenant within the Premises and damage or losses caused by fire, electrical malfunction, gas explosion or water damage of any type (including broken water lines, malfunctioning fire sprinkler systems, roof leaks or stoppages of lines), unless any such loss is due to Landlord’s willful disregard of written notice by Tenant of need for a repair that Landlord is responsible to make for an unreasonable period of time. Tenant further waives any claim for injury to Tenant’s business or loss of income relating to any such damage or destruction of personal property as described in this Section.

28.3 Landlord shall not be liable for any damages arising from any act, omission or neglect of any other tenant in the Building or the Project, or of any other third party.

28.4 Tenant acknowledges that security devices and services, if any, while intended to deter crime, may not in given instances prevent theft or other criminal acts. Landlord shall not be liable for injuries or losses caused by criminal acts of third parties, and Tenant assumes the risk that any security device or service may malfunction or otherwise be circumvented by a criminal. If Tenant desires protection against such criminal acts, then Tenant shall, at Tenant’s sole cost and expense, obtain appropriate insurance coverage.

28.5 The provisions of this Article shall survive the expiration or earlier termination of this Lease.

29. Assignment or Subletting.

29.1 Except as hereinafter expressly permitted, Tenant shall not, either voluntarily or by operation of Applicable Laws, directly or indirectly sell, hypothecate, assign, pledge, encumber or otherwise transfer this Lease, or sublet the Premises (each, a “Transfer”), without Landlord’s prior written consent, which shall not be unreasonably withheld. Notwithstanding the foregoing, except during the continuance of any default by Tenant under this Lease and so long as Tenant has not been in Default more than once during the immediately preceding twelve (12) months and has not been in Default more than twice during the Term, (a) Tenant shall have the right to Transfer without Landlord’s prior written consent the Premises or any part thereof to any person that as of the date of determination and at all times thereafter directly, or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with Tenant or that becomes a parent or successor of Tenant by reason of merger, consolidation, public offering, reorganization, dissolution or sale of stock, membership or partnership interests or assets (“Tenant’s Affiliate”), provided that Tenant shall notify Landlord in writing at least ten (10) days prior to the effectiveness of such Transfer (unless Tenant is restricted from notifying Landlord prior to the effectiveness of such Transfer because of confidentiality restrictions on Tenant, in which case Tenant shall notify Landlord within ten (10) days following the effectiveness of such Transfer) to Tenant’s Affiliate (an “Exempt Transfer”) and otherwise complies with the requirements of this Lease regarding such Transfer, and provided further that Tenant may not Transfer all or any portion of the Premises to any Tenant Affiliate more than once during any twelve (12) month period or twice during the Term without Landlord’s prior written consent, and (b) Tenant shall have the right to sublease a portion of the Premises of approximately three thousand (3,000) square feet to Abide Therapeutics for a portion of the Term, provided that Tenant shall notify Landlord in writing at least ten (10) days prior to the effectiveness of such Transfer to Abide Therapeutics and otherwise complies with the requirements of this Lease regarding such Transfer. For purposes of Exempt Transfers, “control” requires both (x) owning (directly or indirectly) more than fifty percent (50%) of the stock or other equity interests of another person and (y) possessing, directly or indirectly, the power to direct or cause the direction of the management and policies of such person. Notwithstanding the foregoing, the raising of capital by an offering of stock or ownership interest in Tenant shall not be deemed a Transfer for purposes of this Lease and shall not require Landlord’s consent. Except for an Exempt Transfer, Tenant shall not perform a Transfer to or with an entity that is a tenant at the Project or that is in discussions or negotiations with Landlord or an affiliate of Landlord to lease premises at the Project or a property owned by Landlord or an affiliate of Landlord.

29.2 In the event Tenant desires to effect a Transfer, then, at least twenty-five (25) but not more than ninety (90) days prior to the date when Tenant desires the assignment or sublease to be effective (the “Transfer Date”). Tenant shall provide written notice to Landlord (the “Transfer Notice”) containing information (including references) concerning the character of the proposed transferee, assignee or sublessee; the Transfer Date; any ownership or commercial relationship between Tenant and the proposed transferee, assignee or sublessee; and the consideration and all other material terms and conditions of the proposed Transfer, all in such detail as Landlord shall reasonably require.

29.3 Landlord, in determining whether consent should be given to a proposed Transfer, may give consideration to (a) the financial strength of such transferee, assignee or sublessee (notwithstanding Tenant remaining liable for Tenant’s performance), (b) any change in use that such transferee, assignee or sublessee proposes to make in the use of the Premises and (c) Landlord’s desire to exercise its rights under Section 29.8 to cancel this Lease. In no event shall Landlord be deemed to be unreasonable for declining to consent to a Transfer to a transferee, assignee or sublessee of poor reputation, lacking financial qualifications or seeking a change in the Permitted Use, or jeopardizing directly or indirectly the status of Landlord or any of Landlord’s affiliates as a Real Estate Investment Trust under the Internal Revenue Code of 1986 (as the same may be amended from time to time, the “Revenue Code”). Notwithstanding anything contained in this Lease to the contrary, (w) no Transfer shall be consummated on any basis such that the rental or other amounts to be paid by the occupant, assignee, manager or other transferee thereunder would be based, in whole or in part, on the income or profits derived by the business activities of such occupant, assignee, manager or other transferee; (x) Tenant shall not furnish or render any services to an occupant, assignee, manager or other transferee with respect to whom transfer consideration is required to be paid, or manage or operate the Premises or any capital additions so transferred, with respect to which transfer consideration is being paid; (y) Tenant shall not consummate a Transfer with any person in which Landlord owns an interest, directly or indirectly (by applying constructive ownership rules set forth in Section 856(d)(5) of the Revenue Code); and (z) Tenant shall not consummate a Transfer with any person or in any manner that could cause any portion of the amounts received by Landlord pursuant to this Lease or any sublease, license or other arrangement for the right to use, occupy or possess any portion of the Premises to fail to qualify as “rents from real property” within the meaning of Section 856(d) of the Revenue Code, or any similar or successor provision thereto or which could cause any other income of Landlord to fail to qualify as income described in Section 856(c)(2) of the Revenue Code.

29.4 As conditions precedent to Tenant subleasing the Premises or to Landlord considering a request by Tenant to Tenant’s transfer of rights or sharing of the Premises, Landlord may require any or all of the following:

(a) Tenant shall remain fully liable under this Lease during the unexpired Term;

(b) Tenant shall provide Landlord with evidence reasonably satisfactory to Landlord that the value of Landlord’s interest under this Lease shall not be diminished or reduced by the proposed Transfer. Such evidence shall include evidence respecting the relevant business experience and financial responsibility and status of the proposed transferee, assignee or sublessee;

(c) Tenant shall reimburse Landlord for Landlord’s actual costs and expenses, including reasonable attorneys’ fees, charges and disbursements incurred in connection with the review, processing and documentation of such request;

(d) If Tenant’s transfer of rights or sharing of the Premises provides for the receipt by, on behalf of or on account of Tenant of any consideration of any kind whatsoever (including a premium rental for a sublease or lump sum payment for an assignment, but

excluding Tenant’s reasonable costs in marketing and subleasing the Premises) in excess of the rental and other charges due to Landlord under this Lease, Tenant shall pay fifty percent (50%) of all of such excess to Landlord, after making deductions for any reasonable marketing expenses, tenant improvement funds expended by Tenant, alterations, cash concessions, brokerage commissions, attorneys’ fees and free rent actually paid by Tenant. If said consideration consists of cash paid to Tenant, payment to Landlord shall be made upon receipt by Tenant of such cash payment;

(e) The proposed transferee, assignee or sublessee shall agree that, in the event Landlord gives such proposed transferee, assignee or sublessee notice that Tenant is in Default under this Lease, such proposed transferee, assignee or sublessee shall thereafter make all payments otherwise due Tenant directly to Landlord, which payments shall be received by Landlord without any liability being incurred by Landlord, except to credit such payment against those due by Tenant under this Lease, and any such proposed transferee, assignee or sublessee shall agree to attorn to Landlord or its successors and assigns should this Lease be terminated for any reason; provided, however, that in no event shall Landlord or its Lenders, successors or assigns be obligated to accept such attornment;

(f) Landlord’s consent to any such Transfer shall be effected on Landlord’s forms;

(g) A default by Tenant shall not then be continuing hereunder in any respect;

(h) Such proposed transferee, assignee or sublessee’s use of the Premises shall be the same as the Permitted Use;

(i) Landlord shall not be bound by any provision of any agreement pertaining to the Transfer, except for Landlord’s written consent to the same;

(j) Tenant shall pay all transfer and other taxes (including interest and penalties) assessed or payable for any Transfer;

(k) Landlord’s consent (or waiver of its rights) for any Transfer shall not waive Landlord’s right to consent to any later Transfer;

(l) Tenant shall deliver to Landlord one executed copy of any and all written instruments evidencing or relating to the Transfer; and

(m) A list of Hazardous Materials (as defined in Section 21.7), certified by the proposed transferee, assignee or sublessee to be true and correct, that the proposed transferee, assignee or sublessee intends to use or store in the Premises. Additionally, Tenant shall deliver to Landlord, on or before the date any proposed transferee, assignee or sublessee takes occupancy of the Premises, all of the items relating to Hazardous Materials of such proposed transferee, assignee or sublessee as described in Section 21.2.

29.5 Any Transfer that is not in compliance with the provisions of this Article shall be void and shall, at the option of Landlord, terminate this Lease.

29.6 The consent by Landlord to a Transfer shall not relieve Tenant or proposed transferee, assignee or sublessee from obtaining Landlord’s consent to any further Transfer, nor shall it release Tenant or any proposed transferee, assignee or sublessee of Tenant from full and primary liability under this Lease.

29.7 Notwithstanding any Transfer, Tenant shall remain fully and primarily liable for the payment of all Rent and other sums due or to become due hereunder, and for the full performance of all other terms, conditions and covenants to be kept and performed by Tenant. The acceptance of Rent or any other sum due hereunder, or the acceptance of performance of any other term, covenant or condition thereof, from any person or entity other than Tenant shall not be deemed a waiver of any of the provisions of this Lease or a consent to any Transfer.

29.8 If Tenant delivers to Landlord a Transfer Notice indicating a desire to transfer this Lease for substantially the remainder of the Term to a proposed transferee, assignee or sublessee other than as provided within Section 29.4 or as permitted under this Lease as an Exempt Transfer, then Landlord shall have the option, exercisable by giving notice to Tenant at any time within ten (10) days after Landlord’s receipt of such Transfer Notice, to terminate this Lease as of the date specified in the Transfer Notice as the Transfer Date, except for those provisions that, by their express terms, survive the expiration or earlier termination hereof. If Landlord exercises such option, then Tenant shall have the right to withdraw such Transfer Notice by delivering to Landlord written notice of such election within five (5) days after Landlord’s delivery of notice electing to exercise Landlord’s option to terminate this Lease. In the event Tenant withdraws the Transfer Notice as provided in this Section, this Lease shall continue in full force and effect. No failure of Landlord to exercise its option to terminate this Lease shall be deemed to be Landlord’s consent to a proposed Transfer.

29.9 If Tenant sublets the Premises or any portion thereof, Tenant hereby immediately and irrevocably assigns to Landlord, as security for Tenant’s obligations under this Lease, all rent from any such subletting, and appoints Landlord as assignee and attorney-in-fact for Tenant, and Landlord (or a receiver for Tenant appointed on Landlord’s application) may collect such rent and apply it toward Tenant’s obligations under this Lease; provided that, until the occurrence of a Default (as defined below) by Tenant, Tenant shall have the right to collect such rent.

30. Subordination, Non-Disturbance and Attornment.

30.1 This Lease shall be subject and subordinate to the lien of any mortgage, deed of trust, or lease in which Landlord is tenant now or hereafter in force against the Building or the Project and to all advances made or hereafter to be made upon the security thereof without the necessity of the execution and delivery of any further instruments on the part of Tenant to effectuate such subordination. Notwithstanding the foregoing or anything in this Lease to the contrary, Tenant’s agreement to subordinate its interest under this Lease to a lien or ground lease not in existence as of the Execution Date of this Lease shall be conditioned upon the holder of such lien, or a ground lessor, as applicable, confirming in writing that Tenant’s leasehold interest hereunder shall not be disturbed so long as no Default by Tenant exists under this Lease and acknowledging and accepting Tenant’s prepayment of Base Rent set forth in Section 7.1.

Landlord represents and warrants to Tenant that as of the Execution Date no deed of trust, mortgage or ground lease exists on the Building or the Project.

30.2 Notwithstanding the foregoing, Tenant shall execute and deliver upon demand such further instrument or instruments evidencing such subordination of this Lease to the lien of any such mortgage or mortgages or deeds of trust or lease in which Landlord is tenant as may be required by Landlord; provided such subordination provides the non-disturbance protection for Tenant provided for in Section 30.1. If any such mortgagee, beneficiary or landlord under a lease wherein Landlord is tenant (each, a “Mortgagee”) so elects, however, this Lease shall be deemed prior in lien to any such lease, mortgage, or deed of trust upon or including the Premises regardless of date and Tenant shall execute a statement in writing to such effect at Landlord’s request. If Tenant fails to execute any document required from Tenant under this Section within ten (10) days after written request therefor, Tenant hereby constitutes and appoints Landlord or its special attorney-in-fact to execute and deliver any such document or documents in the name of Tenant. Such power is coupled with an interest and is irrevocable.

30.3 Upon written request of Landlord and opportunity for Tenant to review, Tenant agrees to execute any Lease amendments not materially altering the terms of this Lease, if required by a mortgagee or beneficiary of a deed of trust encumbering real property of which the Premises constitute a part incident to the financing of the real property of which the Premises constitute a part.

30.4 In the event any proceedings are brought for foreclosure, or in the event of the exercise of the power of sale under any mortgage or deed of trust made by Landlord covering the Premises, Tenant shall at the election of the purchaser at such foreclosure or sale attorn to the purchaser upon any such foreclosure or sale and recognize such purchaser as Landlord under this Lease.

31. Defaults and Remedies.

31.1 Late payment by Tenant to Landlord of Rent and other sums due shall cause Landlord to incur costs not contemplated by this Lease, the exact amount of which shall be extremely difficult and impracticable to ascertain. Such costs include processing and accounting charges and late charges that may he imposed on Landlord by the terms of any mortgage or trust deed covering the Premises. Therefore, if any installment of Rent due from Tenant is not received by Landlord within three (3) days after such payment is due, Tenant shall pay to Landlord (a) an additional sum of six percent (6%) of the overdue Rent as a late charge plus (b) interest at an annual rate (the “Default Rate”) equal to the lesser of (a) twelve percent (12%) and (b) the highest rate permitted by Applicable Laws; provided that, during each twelve (12) month period during the Term, the foregoing additional sum and interest at the Default Rate shall not be charged on the first late payment of Rent during the applicable twelve (12) month period unless such payment of rent is not received by Landlord within three (3) days after notice to Tenant that such payment is overdue. The parties agree that this late charge represents a fair and reasonable estimate of the costs that Landlord shall incur by reason of late payment by Tenant and shall be payable as Additional Rent to Landlord due with the next installment of Rent or within five (5) business days after Landlord’s demand, whichever is earlier. Landlord’s acceptance of any Additional Rent (including a late charge or any other amount hereunder) shall not be deemed an

extension of the date that Rent is due or prevent Landlord from pursuing any other rights or remedies under this Lease, at law or in equity.

31.2 No payment by Tenant or receipt by Landlord of a lesser amount than the Rent payment herein stipulated shall be deemed to be other than on account of the Rent, nor shall any endorsement or statement on any check or any letter accompanying any check or payment as Rent be deemed an accord and satisfaction, and Landlord may accept such check or payment without prejudice to Landlord’s right to recover the balance of such Rent or pursue any other remedy provided in this Lease or in equity or at law. If a dispute shall arise as to any amount or sum of money to be paid by Tenant to Landlord hereunder, Tenant shall have the right to make payment “under protest,” such payment shall not be regarded as a voluntary payment, and there shall survive the right on the part of Tenant to institute suit for recovery of the payment paid under protest.

31.3 If Tenant fails to pay any sum of money required to be paid by it hereunder, or shall fail to perform any other act on its part to be performed hereunder, in each case within the applicable cure period (if any) described in Section 31.4, then Landlord may, without waiving or releasing Tenant from any obligations of Tenant, but shall not be obligated to, make such payment or perform such act; provided that such failure by Tenant unreasonably interfered with the use of the Building or the Project by any other tenant or with the efficient operation of the Building or the Project, or resulted or could have resulted in a violation of Applicable Laws or the cancellation of an insurance policy maintained by Landlord. Notwithstanding the foregoing, in the event of an emergency, Landlord shall have the right to enter the Premises and act in accordance with its rights as provided elsewhere in this Lease. In addition to the late charge described in Section 31.1, Tenant shall pay to Landlord as Additional Rent all sums so paid or incurred by Landlord, together with interest at the Default Rate, computed from the date such sums were paid or incurred.

31.4 The occurrence of any one or more of the following events shall constitute a “Default” hereunder by Tenant:

(a) Tenant abandons the Premises;

(b) Tenant fails to make any payment of Rent, as and when due, or to satisfy its obligations under Article 19, where such failure shall continue for a period of five (5) days after written notice thereof from Landlord to Tenant;

(c) Tenant fails to observe or perform any obligation or covenant contained herein (other than described in Subsections 31.4(a) and 31.4(b)) to be performed by Tenant, where such failure continues for a period of twenty (20) days after written notice thereof from Landlord to Tenant; provided that, if the nature of Tenant’s default is such that it reasonably requires more than twenty (20) days to cure, Tenant shall not be deemed to be in Default if Tenant commences such cure within said twenty (20) day period and thereafter diligently prosecute the same to completion; and provided, further, that such cure is completed no later than forty-five (45) days after Tenant’s receipt of written notice from Landlord;

(d) Tenant makes an assignment for the benefit of creditors;

(e) A receiver, trustee or custodian is appointed to or does take title, possession or control of all or substantially all of Tenant’s assets;

(f) Tenant files a voluntary petition under the United States Bankruptcy Code or any successor statute (as the same may be amended from time to time, the “Bankruptcy Code”) or an order for relief is entered against Tenant pursuant to a voluntary or involuntary proceeding commenced under any chapter of the Bankruptcy Code;

(g) Any involuntary petition is filed against Tenant under any chapter of the Bankruptcy Code and is not dismissed within one hundred twenty (120) days;

(h) A default exists under the Convertible Promissory Note or the Side Letter (defined below), after expiration of any applicable notice and cure periods;

(i) Tenant fails to deliver an estoppel certificate in accordance with Article 20; or

(j) Tenant’s interest in this Lease is attached, executed upon or otherwise judicially seized and such action is not released within one hundred twenty (120) days of the action.

Notices given under this Section shall specify the alleged default and shall demand that Tenant perform the provisions of this Lease or pay the Rent that is in arrears, as the case may be, within the applicable period of time, or quit the Premises. No such notice shall be deemed a forfeiture or a termination of this Lease unless Landlord elects otherwise in such notice.

31.5 In the event of a Default by Tenant, and at any time thereafter, with or without notice or demand and without limiting Landlord in the exercise of any right or remedy that Landlord may have, Landlord has the right to do any or all of the following:

(a) Halt any Tenant Improvements and Alterations and order Tenant’s contractors, subcontractors, consultants, designers and material suppliers to stop work;

(b) Terminate Tenant’s right to possession of the Premises by written notice to Tenant or by any lawful means, in which case Tenant shall immediately surrender possession of the Premises to Landlord. In such event, Landlord shall have the immediate right to re-enter and remove all persons and property, and such property may be removed and stored in a public warehouse or elsewhere at the cost and for the account of Tenant, all without service of notice or resort to legal process and without being deemed guilty of trespass or becoming liable for any loss or damage that may be occasioned thereby; and

(c) Terminate this Lease, in which event Tenant shall immediately surrender possession of the Premises to Landlord. In such event, Landlord shall have the immediate right to re-enter and remove all persons and property, and such property may be removed and stored in a public warehouse or elsewhere at the cost and for the account of Tenant, all without service of notice or resort to legal process and without being deemed guilty of trespass or becoming liable

for any loss or damage that may be occasioned thereby. In the event that Landlord shall elect to so terminate this Lease, then Landlord shall be entitled to recover from Tenant all damages incurred by Landlord by reason of Tenant’s Default, including:

(i) The worth at the time of award of any unpaid Rent that had accrued at the time of such termination; plus

(ii) The worth at the time of award of the amount by which the unpaid Rent that would have accrued during the period commencing with termination of the Lease and ending at the time of award exceeds that portion of the loss of Landlord’s rental income from the Premises that Tenant proves to Landlord’s reasonable satisfaction could have been reasonably avoided; plus

(iii) The worth at the time of award of the amount by which the unpaid Rent for the balance of the Term after the time of award exceeds that portion of the loss of Landlord’s rental income from the Premises that Tenant proves to Landlord’s reasonable satisfaction could have been reasonably avoided; plus

(iv) Any other amount necessary to compensate Landlord for all the detriment caused by Tenant’s failure to perform its obligations under this Lease or that in the ordinary course of things would be likely to result therefrom, including the cost of restoring the Premises to the condition required under the terms of this Lease, including any rent payments not otherwise chargeable to Tenant (e.g., during any “free” rent period or rent holiday); plus

(v) At Landlord’s election, such other amounts in addition to or in lieu of the foregoing as may be permitted from time to time by Applicable Laws.

As used in Subsections 31.5(c)(i) and 31.5(c)(ii), “worth at the time of award” shall be computed by allowing interest at the Default Rate. As used in Subsection 31.5(c)(iii), the “worth at the time of the award” shall be computed by taking the present value of such amount, using the discount rate of the Federal Reserve Bank of San Francisco at the time of the award plus one (1) percentage point.

31.6 In addition to any other remedies available to Landlord at law or in equity and under this Lease, Landlord shall have the remedy described in California Civil Code Section 1951.4 and may continue this Lease in effect after Tenant’s Default and abandonment and recover Rent as it becomes due, provided Tenant has the right to sublet or assign, subject only to reasonable limitations. In addition, Landlord shall not be liable in any way whatsoever for its failure or refusal to relet the Premises. For purposes of this Section, the following acts by Landlord will not constitute the termination of Tenant’s right to possession of the Premises:

(a) Acts of maintenance or preservation or efforts to relet the Premises, including alterations, remodeling, redecorating, repairs, replacements or painting as Landlord shall consider advisable for the purpose of reletting the Premises or any part thereof; or

(b) The appointment of a receiver upon the initiative of Landlord to protect Landlord’s interest under this Lease or in the Premises.

Notwithstanding the foregoing, in the event of a Default by Tenant, Landlord may elect at any time to terminate this Lease and to recover damages to which Landlord is entitled.

31.7 If Landlord does not elect to terminate this Lease as provided in Section 31.5, then Landlord may, from time to time, recover all Rent as it becomes due under this Lease. At any time thereafter, Landlord may elect to terminate this Lease and to recover damages to which Landlord is entitled.

31.8 In the event Landlord elects to terminate this Lease and relet the Premises, Landlord may execute any new lease in its own name. Tenant hereunder shall have no right or authority whatsoever to collect any Rent from such tenant. The proceeds of any such reletting shall be applied as follows:

(a) First, to the payment of any indebtedness other than Rent due hereunder from Tenant to Landlord, including storage charges or brokerage commissions owing from Tenant to Landlord as the result of such reletting;

(b) Second, to the payment of the costs and expenses of reletting the Premises, including (i) alterations and repairs that Landlord deems reasonably necessary and advisable and (ii) reasonable attorneys’ fees, charges and disbursements incurred by Landlord in connection with the retaking of the Premises and such reletting;

(d) Fourth, to the payment of future Rent and other damages payable by Tenant under this Lease.

31.9 All of Landlord’s rights, options and remedies hereunder shall be construed and held to be nonexclusive and cumulative. Landlord shall have the right to pursue any one or all of such remedies, or any other remedy or relief that may be provided by Applicable Laws, whether or not stated in this Lease. No waiver of any default of Tenant hereunder shall be implied from any acceptance by Landlord of any Rent or other payments due hereunder or any omission by Landlord to take any action on account of such default if such default persists or is repeated, and no express waiver shall affect defaults other than as specified in said waiver.

31.10 Landlord’s termination of (a) this Lease or (b) Tenant’s right to possession of the Premises shall not relieve Tenant of any liability to Landlord that has previously accrued or that shall arise based upon events that occurred prior to the later to occur of (i) the date of Lease termination or (ii) the date Tenant surrenders possession of the Premises.

31.11 To the extent permitted by Applicable Laws, Tenant waives any and all rights of redemption granted by or under any present or future Applicable Laws if Tenant is evicted or dispossessed for any cause, or if Landlord obtains possession of the Premises due to Tenant’s default hereunder or otherwise.

31.12 Landlord shall not be in default or liable for damages under this Lease unless Landlord fails to perform obligations required of Landlord within a reasonable time, but in no event shall such failure continue for more than thirty (30) days after written notice from Tenant specifying the nature of Landlord’s failure; provided, however, that if the nature of Landlord’s obligation is such that more than thirty (30) days are required for its performance, then Landlord shall not be in default if Landlord commences performance within such thirty (30) day period and thereafter diligently prosecutes the same to completion. In no event shall Tenant have the right to terminate or cancel this Lease or to withhold or ▇▇▇▇▇ rent or to set off any Claims against Rent as a result of any default or breach by Landlord of any of its covenants, obligations, representations, warranties or promises hereunder, except as may otherwise be expressly set forth in this Lease. Nothing in this Lease shall be construed to limit Tenant’s remedies in the event Tenant brings a lawsuit for any default by Landlord, in which case Tenant may pursue any remedies available at law or in equity (provided that Tenant’s recourse will be limited by Article 35 and the other terms and provisions of this Lease).

31.13 In the event of any default by Landlord, Tenant shall give notice by registered or certified mail to any (a) beneficiary of a deed of trust or (b) mortgagee under a mortgage covering the Premises, the Building or the Project and to any landlord of any lease of land upon or within which the Premises, the Building or the Project is located, and shall offer such beneficiary, mortgagee or landlord a reasonable opportunity to cure the default, including time to obtain possession of the Building or the Project by power of sale or a judicial action if such should prove necessary to effect a cure; provided that Landlord shall furnish to Tenant in writing, upon written request by Tenant, the names and addresses of all such persons who are to receive such notices.

32. Bankruptcy. In the event a debtor, trustee or debtor in possession under the Bankruptcy Code, or another person with similar rights, duties and powers under any other Applicable Laws, proposes to cure any default under this Lease or to assume or assign this Lease and is obliged to provide adequate assurance to Landlord that (a) a default shall be cured, (b) Landlord shall be compensated for its damages arising from any breach of this Lease and (c) future performance of Tenant’s obligations under this Lease shall occur, then such adequate assurances shall include any or all of the following, as designated by Landlord in its sole and absolute discretion:

32.1 Those acts specified in the Bankruptcy Code or other Applicable Laws as included within the meaning of “adequate assurance,” even if this Lease does not concern a shopping center or other facility described in such Applicable Laws;

32.2 A prompt cash payment to compensate Landlord for any monetary defaults or actual damages arising directly from a breach of this Lease;

32.3 A cash deposit in an amount at least equal to the then-current amount of the Security Deposit; or

32.4 The assumption or assignment of all of Tenant’s interest and obligations under this Lease.

33. Brokers.

33.1 Tenant represents and warrants that it has had no dealings with any real estate broker or agent in connection with the negotiation of this Lease other than ▇▇▇▇▇▇ ▇▇▇▇▇▇ (“Broker”), and that it knows of no other real estate broker or agent that is or might be entitled to a commission in connection with this Lease. Landlord shall compensate Broker in relation to this Lease pursuant to a separate agreement between Landlord and Broker.

33.2 Tenant represents and warrants that no broker or agent has made any representation or warranty relied upon by Tenant in Tenant’s decision to enter into this Lease, other than as contained in this Lease.

33.3 Tenant acknowledges and agrees that the employment of brokers by Landlord is for the purpose of solicitation of offers of leases from prospective tenants and that no authority is granted to any broker to furnish any representation (written or oral) or warranty from Landlord unless expressly contained within this Lease. Landlord is executing this Lease in reliance upon Tenant’s representations, warranties and agreements contained within Sections 33.1 and 33.2.

33.4 Tenant agrees to indemnify, save, defend (at Landlord’s option and with counsel reasonably acceptable to Landlord) and hold the Landlord Indemnitees harmless from any and all cost or liability for compensation claimed by any broker or agent, other than Broker, employed or engaged by Tenant or claiming to have been employed or engaged by Tenant.

34. Definition of Landlord. With regard to obligations imposed upon Landlord pursuant to this Lease, the term “Landlord,” as used in this Lease, shall refer only to Landlord or Landlord’s then-current successor-in-interest. In the event of any transfer, assignment or conveyance of Landlord’s interest in this Lease or in Landlord’s fee title to or leasehold interest in the Property, as applicable, Landlord herein named (and in case of any subsequent transfers or conveyances, the subsequent Landlord) shall be automatically freed and relieved, from and after the date of such transfer, assignment or conveyance, from all liability for the performance of any covenants or obligations contained in this Lease thereafter to be performed by Landlord and, without further agreement, the transferee, assignee or conveyee of Landlord’s in this Lease or in Landlord’s fee title to or leasehold interest in the Property, as applicable, shall be deemed to have assumed and agreed to observe and perform any and all covenants and obligations of Landlord hereunder during the tenure of its interest in the Lease or the Property. Landlord or any subsequent Landlord may transfer its interest in the Premises or this Lease without Tenant’s consent.

35. Limitation of Landlord’s Liability.

35.1 If Landlord is in default under this Lease and, as a consequence, Tenant recovers a monetary judgment against Landlord, the judgment shall be satisfied only out of (a) the proceeds of sale received on execution of the judgment and levy against the right, title and interest of Landlord in the Building and the Project, (b) rent or other income from such real property receivable by Landlord or (c) the consideration received by Landlord from the sale, financing, refinancing or other disposition of all or any part of Landlord’s right, title or interest in the Building or the Project.

35.2 Except as otherwise provided in Section 35.1, Landlord shall not be personally liable for any deficiency under this Lease. If Landlord is a partnership or joint venture, then the partners of such partnership shall not be personally liable for Landlord’s obligations under this Lease, and no partner of Landlord shall be sued or named as a party in any suit or action, and service of process shall not be made against any partner of Landlord except as may be necessary to secure jurisdiction of the partnership or joint venture. If Landlord is a corporation, then the shareholders, directors, officers, employees and agents of such corporation shall not be personally liable for Landlord’s obligations under this Lease, and no shareholder, director, officer, employee or agent of Landlord shall be sued or named as a party in any suit or action, and service of process shall not be made against any shareholder, director, officer, employee or agent of Landlord. If Landlord is a limited liability company, then the members of such limited liability company shall not be personally liable for Landlord’s obligations under this Lease, and no member of Landlord shall be sued or named as a party in any suit or action, and service of process shall not be made against any member of Landlord except as may be necessary to secure jurisdiction of the limited liability company. No partner, shareholder, director, employee, member or agent of Landlord shall be required to answer or otherwise plead to any service of process, and no judgment shall be taken or writ of execution levied against any partner, shareholder, director, employee, member or agent of Landlord.

35.3 Each of the covenants and agreements of this Article shall be applicable to any covenant or agreement either expressly contained in this Lease or imposed by Applicable Laws and shall survive the expiration or earlier termination of this Lease.

36. Joint and Several Obligations. If more than one person or entity executes this Lease as Tenant, then:

36.1 Each of them is jointly and severally liable for the keeping, observing and performing of all of the terms, covenants, conditions, provisions and agreements of this Lease to be kept, observed or performed by Tenant; and

36.2 The term “Tenant,” as used in this Lease shall mean and include each of them, jointly and severally. The act of, notice from, notice to, refund to, or signature of any one or more of them with respect to the tenancy under this Lease, including any renewal, extension, expiration, termination or modification of this Lease, shall be binding upon each and all of the persons executing this Lease as Tenant with the same force and effect as if each and all of them had so acted, so given or received such notice or refund, or so signed.

37. Representations. Tenant guarantees, warrants and represents that (a) Tenant is duly incorporated or otherwise established or formed and validly existing under the laws of its state of incorporation, establishment or formation, (b) Tenant has and is duly qualified to do business in the state in which the Property is located, (c) Tenant has full corporate, partnership, trust, association or other appropriate power and authority to enter into this Lease and to perform all Tenant’s obligations hereunder, (d) each person (and all of the persons if more than one signs) signing this Lease on behalf of Tenant is duly and validly authorized to do so and (e) neither (i) the execution, delivery or performance of this Lease nor (ii) the consummation of the transactions contemplated hereby will violate or conflict with any provision of documents or instruments under which Tenant is constituted or to which Tenant is a party. In addition, Tenant

guarantees, warrants and represents that none of (x) it, (y) its affiliates or partners nor (z) to the best of its knowledge, its members, shareholders or other equity owners or any of their respective employees, officers, directors, representatives or agents is a person or entity with whom U.S. persons or entities are restricted from doing business under regulations of the Office of Foreign Asset Control (“OFAC”) of the Department of the Treasury (including those named on OFAC’s Specially Designated and Blocked Persons List) or under any statute, executive order (including the September 24, 2001, Executive Order Blocking Property and Prohibiting Transactions with Persons Who Commit, Threaten to Commit, or Support Terrorism) or other similar governmental action.

38. Confidentiality. Each party shall keep the terms and conditions of this Lease and any information provided to such party or its employees, agents or contractors pursuant to Article 9 confidential and shall not (a) disclose to any third party any terms or conditions of this Lease or any other Lease-related document (including subleases, assignments, work letters, construction contracts, letters of credit, subordination agreements, non-disturbance agreements, brokerage agreements or estoppels) or (b) provide to any third party an original or copy of this Lease (or any Lease-related document). Landlord shall keep confidential the economic and commercial terms and conditions of this Lease and all proprietary, business and technical information of Tenant obtained by Landlord; provided, however, that Landlord may disclose such information in the form of aggregate leasing data provided to investors in the normal course of business. Notwithstanding the foregoing, confidential information under this Section may be released by Landlord or Tenant under the following circumstances: (x) if required by Applicable Laws or in any judicial proceeding; provided that the releasing party has given the other party reasonable notice of such requirement, if feasible, (y) to a party’s attorneys, accountants, brokers and other bona fide consultants or advisers (with respect to this Lease only); provided such third parties agree to be bound by this Section or (z) to bona fide prospective assignees or subtenants of this Lease; provided they agree in writing to be bound by this Section.

39. Notices. Any notice, consent, demand, ▇▇▇▇, statement or other communication required or permitted to be given hereunder shall be in writing and shall be given by personal delivery, overnight delivery with a reputable nationwide overnight delivery service, or certified mail (return receipt requested), and if given by personal delivery, shall be deemed delivered upon receipt; if given by overnight delivery, shall be deemed delivered one (1) business day after deposit with a reputable nationwide overnight delivery service; and, if given by certified mail (return receipt requested), shall be deemed delivered three (3) business days after the time the notifying party deposits the notice with the United States Postal Service. Any notices given pursuant to this Lease shall be addressed to Tenant at the Premises, or to Landlord or Tenant at the addresses shown in Sections 2.9 and 2.10, respectively. Either party may, by notice to the other given pursuant to this Section, specify additional or different addresses for notice purposes.

40. Intentionally Omitted.

41. Miscellaneous.

41.1 Landlord reserves the right to change the name of the Building or the Project in its sole discretion.

41.2 To induce Landlord to enter into this Lease, Tenant agrees that it shall promptly furnish to Landlord, from time to time, upon Landlord’s written request, the most recent year-end financial statements reflecting Tenant’s current financial condition audited by a nationally recognized accounting firm. Tenant shall, within ninety (90) days after the end of Tenant’s financial year, furnish Landlord with a certified copy of Tenant’s year-end financial statements for the previous year audited by a nationally recognized accounting firm. Tenant represents and warrants that all financial statements, records and information furnished by Tenant to Landlord in connection with this Lease are true, correct and complete in all respects. If audited financials are not otherwise prepared, unaudited financials complying with generally accepted accounting principles and certified by the chief financial officer of Tenant as true, correct and complete in all respects shall suffice for purposes of this Section.

41.3 Where applicable in this Lease, the singular includes the plural and the masculine or neuter includes the masculine, feminine and neuter. The words “include,” “includes,” “included” and “including” shall mean “‘include,’ etc., without limitation.” The section headings of this Lease are not a part of this Lease and shall have no effect upon the construction or interpretation of any part hereof.

41.4 If either party commences an action against the other party arising out of or in connection with this Lease, then the substantially prevailing party shall be reimbursed by the other party for all reasonable costs and expenses, including reasonable attorneys’ fees and expenses, incurred by the substantially prevailing party in such action or proceeding and in any appeal in connection therewith.

41.5 Submission of this instrument for examination or signature by Tenant does not constitute a reservation of or option for a lease, and shall not be effective as a lease or otherwise until execution by and delivery to both Landlord and Tenant.

41.6 Time is of the essence with respect to the performance of every provision of this Lease in which time of performance is a factor.

41.7 [Intentionally Omitted]

41.8 Whenever consent or approval of either party is required, that party shall not unreasonably withhold such consent or approval, except as may be expressly set forth to the contrary.

41.9 The terms of this Lease are intended by the parties as a final expression of then-agreement with respect to the terms as are included herein, and may not be contradicted by evidence of any prior or contemporaneous agreement.

41.10 Any provision of this Lease that shall prove to be invalid, void or illegal shall in no way affect, impair or invalidate any other provision hereof, and all other provisions of this Lease shall remain in full force and effect and shall be interpreted as if the invalid, void or illegal provision did not exist.

41.11 Landlord may, but shall not be obligated to, record a short form or memorandum hereof without Tenant’s consent. Within ten (10) days after receipt of written request from Landlord, Tenant shall execute a termination of any short form or memorandum of lease recorded with respect hereto. Neither party shall record this Lease. The party requesting the recording of any short form or memorandum of this Lease shall be responsible for such cost, including any transfer or other taxes incurred in connection with said recordation.

41.12 The language in all parts of this Lease shall be in all cases construed as a whole according to its fair meaning and not strictly for or against either Landlord or Tenant.

41.13 Each of the covenants, conditions and agreements herein contained shall inure to the benefit of and shall apply to and be binding upon the parties hereto and their respective heirs; legatees; devisees; executors; administrators; and permitted successors, assigns and sublessees. Nothing in this Section shall in any way alter the provisions of this Lease restricting assignment or subletting.

41.14 Except for BioMed Realty, L.P., who is an intended third-party beneficiary of this Lease, this Lease is solely for the benefit of the parties hereto and their respective successors and permitted assigns and this Lease shall not otherwise be deemed to confer upon or give to any other third party any right, claim, cause of action or other interest herein.

41.15 This Lease shall be governed by, construed and enforced in accordance with the laws of the state in which the Premises are located, without regard to such state’s conflict of law principles.

41.16 Tenant guarantees, warrants and represents that the individual or individuals signing this Lease have the power, authority and legal capacity to sign this Lease on behalf of and to bind all entities, corporations, partnerships, limited liability companies, joint venturers or other organizations and entities on whose behalf said individual or individuals have signed.

41.17 This Lease may be executed in one or more counterparts, each of which, when taken together, shall constitute one and the same document.

41.18 No provision of this Lease may be modified, amended or supplemented except by an agreement in writing signed by Landlord and Tenant. The waiver by Landlord or Tenant of any breach by the other party of any term, covenant or condition herein contained shall not be deemed to be a waiver of any subsequent breach of the same or any other term, covenant or condition herein contained.

41.19 To the extent permitted by Applicable Laws, the parties waive trial by jury in any action, proceeding or counterclaim brought by the other party hereto related to matters arising out of or in any way connected with this Lease; the relationship between Landlord and Tenant; Tenant’s use or occupancy of the Premises; or any claim of injury or damage related to this Lease or the Premises.

42. Option to Extend Term. Tenant shall have the option (“Option”) to extend the Term by five (5) years as to the entire Premises (and no less than the entire Premises) upon the following

terms and conditions. Any extension of the Term pursuant to the Option shall be on all the same terms and conditions as this Lease, except as follows:

42.1 Base Rent and increases of Base Rent during the Option term shall equal the fair market value (“FMV”). If Landlord and Tenant cannot agree on the FMV within thirty (30) days after Landlord’s receipt of an Option Notice (as defined below), they shall mutually agree on a third party real estate broker with at least ten (10) years’ experience in the leasing of life science properties in the San Diego, California, area, who shall determine the FMV, which determination shall be binding on Landlord and Tenant. Landlord and Tenant shall each pay one-half (1/2) of the cost of the broker. FMV shall be defined as the amount of rent that a well-informed tenant, willing (but not obliged) to lease the Premises, would pay, and that a well-informed landlord, willing (but not obliged) to lease to a tenant, would accept, taking into consideration (y) all uses to which the Premises are adapted and might in reason be applied and (z) the then-market terms being offered in the ▇▇▇▇▇▇ ▇▇▇▇▇ submarket for premises reasonably comparable to the Premises.

42.2 The Option is not assignable separate and apart from this Lease.

42.3 The Option is conditional upon Tenant giving Landlord written notice of its election to exercise the Option at least nine (9) months prior to the end of the expiration of the then-current Term. Time shall be of the essence as to Tenant’s exercise of the Option. Tenant assumes full responsibility for maintaining a record of the deadlines to exercise the Option. Tenant acknowledges that it would be inequitable to require Landlord to accept any exercise of the Option after the date provided for in this Section.

42.4 Notwithstanding anything contained in this Article to the contrary, Tenant shall not have the right to exercise the Option:

(a) During the time commencing from the date Landlord delivers to Tenant a written notice that Tenant is in default under any provisions of this Lease and continuing until Tenant has cured the specified default to Landlord’s reasonable satisfaction; or

(b) At any time after any Default as described in Article 31 of the Lease (provided, however, that, for purposes of this Subsection 42.4(b), Landlord shall not be required to provide Tenant with notice of such Default) and continuing until Tenant cures any such Default, if such Default is susceptible to being cured; or

(c) In the event that Tenant has defaulted in the performance of its obligations under this Lease two (2) or more times and a service or late charge has become payable under Section 31.1 for each of such defaults during the twelve (12)-month period immediately prior to the date that Tenant intends to exercise the Option, whether or not Tenant has cured such defaults.

42.5 The period of time within which Tenant may exercise the Option shall not be extended or enlarged by reason of Tenant’s inability to exercise such Option because of the provisions of Section 42.4.

42.6 All of Tenant’s rights under the provisions of the Option shall terminate and be of no further force or effect even after Tenant’s due and timely exercise of the Option if, after such exercise, but prior to the commencement date of the new term, (a) Tenant fails to pay to Landlord a monetary obligation of Tenant for a period of twenty (20) days after written notice from Landlord to Tenant, (b) Tenant fails to commence to cure a default (other than a monetary default) within thirty (30) days after the date Landlord gives notice to Tenant of such default or (c) Tenant has defaulted under this Lease two (2) or more times and a service or late charge under Section 31.1 has become payable for any such default, whether or not Tenant has cured such defaults.

43. Investment Rights of BioMed Realty, L.P.. In accordance and subject to the terms and conditions set forth in that certain side letter by and between BioMed Realty, L.P. and Tenant dated December 22, 2011 (the “Side Letter”), BioMed Realty, L.P. shall have certain participation rights in a future equity financing of Tenant and may have certain Board observer rights, which Board observer rights are subject to the approval of Tenant’s Board of Directors.

[REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

IN WITNESS WHEREOF, the parties hereto have executed this Lease as of the date first above written.


LANDLORD:

BMR-▇▇▇▇ ▇▇▇▇▇▇▇ COURT LLC, a Delaware limited liability company

By:		/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
Name:		▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
Title:		VP, Real Estate Counsel

TENANT:

ATYR PHARMA, INC., a Delaware corporation

By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇
Name:		▇▇▇▇▇▇ ▇▇▇▇▇▇
Title:		VP, Intellectual Property

EXHIBIT A

PREMISES

A-1

EXHIBIT B

WORK LETTER

This Work Letter (this “Work Letter”) is made and entered into as of the 22^nd day of December, 2011, by and between BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC, a Delaware limited liability company (“Landlord”), and aTyr Pharma, Inc., a Delaware corporation (“Tenant”), and is attached to and made a part of that certain Lease dated as of December 22, 2011 (as the same may be amended, amended and restated, supplemented or otherwise modified from time to time, the “Lease”), by and between Landlord and Tenant for the Premises located at ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇. All capitalized terms used but not otherwise defined herein shall have the meanings given them in the Lease.

1. General Requirements.

1.1. Authorized Representatives.

(a) Landlord designates, as Landlord’s authorized representative (“Landlord’s Authorized Representative”), (a) ▇▇▇▇▇▇▇▇ ▇▇▇▇ as the person authorized to initial plans, drawings and approvals pursuant to this Work Letter and (b) ▇▇▇▇ ▇▇▇▇▇▇▇ as the person authorized to initial plans, drawings, approvals and to sign change orders pursuant to this Work Letter and any amendments to this Work Letter or the Lease. Tenant shall not be obligated to respond to or act upon any such item until such item has been initialed or signed (as applicable) by the appropriate Landlord’s Authorized Representative. Landlord may change either Landlord’s Authorized Representative upon one (1) business day’s prior written notice to Tenant.

(b) Tenant designates both ▇▇▇▇▇▇ ▇▇▇▇▇▇ and ▇▇▇▇ ▇▇▇▇▇▇▇▇ (each, a “Tenant’s Authorized Representative”) acting individually as the individuals authorized to initial and sign all plans, drawings, change orders and approvals pursuant to this Work Letter. Landlord shall not be obligated to respond to or act upon any such item until such item has been initialed or signed (as applicable) by Tenant’s Authorized Representative. Tenant may change Tenant’s Authorized Representative upon one (1) business day’s prior written notice to Landlord.

1.2. Schedule. The schedule for design and development of the Tenant Improvements, including the time periods for preparation and review of construction documents, approvals and performance, shall be in accordance with the schedule attached hereto as Exhibit 1 (the “Schedule”). The Schedule shall be subject to adjustment as mutually agreed upon in writing by the parties, or as otherwise provided in this Work Letter.

1.3. Landlord’s Architects, Contractors and Consultants. The architect, engineering consultants, design team, general contractor and subcontractors responsible for the construction of the Tenant Improvements shall be ▇▇▇▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ Architects, ▇▇▇▇▇▇▇ Construction, Apex Mechanical and ▇▇▇▇▇▇ Electric, and Landlord shall use commercially reasonable efforts to obtain market competitive rates from such parties in connection with the design, development and construction of the Tenant Improvements.

B-1

2. Tenant Improvements. All Tenant Improvements shall be performed by Landlord’s contractor (“Contractor”), at Tenant’s sole cost and expense (subject to Landlord’s obligations with respect to any portion of the Base TI Allowance and, if properly requested by Tenant pursuant to the terms of the Lease, the Additional TI Allowance used by Landlord in completing the Tenant Improvements) and in substantial accordance with the Approved Plans (as defined below), the Lease and this Work Letter. To the extent that the total projected cost of the Tenant Improvements (as projected by Landlord) exceeds the TI Allowance (such excess, the “Excess TI Costs”) and Tenant agrees with Landlord’s projection and has been given opportunity to value engineer the project to a total that is at or below the TI Allowance, if desired, (provided that Tenant’s opportunity to value engineer the project shall end on January 6, 2012), Tenant shall pay the costs of the Tenant Improvements on a pari passu basis with Landlord as such costs become due, in the proportion of Excess TI Costs payable by Tenant to the Base TI Allowance (and, if properly requested by Tenant pursuant to the Lease, the Additional TI Allowance) payable by Landlord. If Tenant fails to pay, or is late in paying, any sum due to Landlord under this Work Letter, then Landlord shall have all of the rights and remedies set forth in the Lease for nonpayment of Rent (including the right to interest and the right to assess a late charge), and for purposes of any litigation instituted with regard to such amounts the same shall be considered Rent. All material and equipment furnished by Landlord or its contractors as the Tenant Improvements shall be new or “like new,” and the Tenant Improvements shall be performed in a first-class, workmanlike manner. Landlord and Tenant shall use commercially reasonable efforts to cooperate with each other to enforce any and all warranties from the Contractor with respect to the Tenant Improvements. Landlord warrants that, as of Substantial Completion of the Tenant Improvements, the Tenant Improvements shall be in compliance with all Applicable Laws, and Landlord shall, at its sole cost and expense and as Tenant’s sole remedy, correct any breach of such warranty promptly following receipt of written notice thereof from Tenant.

2.1. Work Plans. Landlord shall prepare and submit to Tenant for approval schematics covering the Tenant Improvements prepared in conformity with the applicable provisions of this Work Letter (the “Draft Schematic Plans”). The Draft Schematic Plans shall contain sufficient information and detail to accurately describe the proposed design to Tenant. Tenant shall notify Landlord in writing within five (5) days after receipt of the Draft Schematic Plans whether Tenant approves or objects to the Draft Schematic Plans and of the manner, if any, in which the Draft Schematic Plans are unacceptable. Tenant’s failure to respond within such five (5) day period shall be deemed approval by Tenant. If Tenant reasonably objects to the Draft Schematic Plans, then Landlord shall revise the Draft Schematic Plans and cause Tenant’s objections to be remedied in the revised Draft Schematic Plans. Landlord shall then resubmit the revised Draft Schematic Plans to Tenant for approval, such approval not to be unreasonably withheld, conditioned or delayed. Tenant’s approval of or objection to revised Draft Schematic Plans and Landlord’s correction of the same shall be in accordance with this Section until Tenant has approved the Draft Schematic Plans in writing or been deemed to have approved them. The iteration of the Draft Schematic Plans that is approved or deemed approved by Tenant without objection shall be referred to herein as the “Approved Schematic Plans.” In the event that Draft Schematic Plans are not approved by Tenant in accordance with this Section on or before the Execution Date, then, notwithstanding anything in the Lease or this Work Letter to the contrary, Landlord shall be entitled to a day-for-day delay for every day after such date until Draft Schematic Plans are approved by Tenant in accordance with this Section.

B-2

2.2. Construction Plans. Landlord shall prepare final plans and specifications for the Tenant Improvements that (a) are consistent with and are logical evolutions of the Approved Schematic Plans and (b) incorporate any other Tenant-requested (and Landlord-approved) Changes (as defined below). As soon as such final plans and specifications (“Construction Plans”) are completed, Landlord shall deliver the same to Tenant for Tenant’s approval, which approval shall not be unreasonably withheld, conditioned or delayed. Such Construction Plans shall be approved or disapproved by Tenant within five (5) days after delivery to Tenant. Tenant’s failure to respond within such five (5) day period shall be deemed approval by Tenant. If the Construction Plans are disapproved by Tenant, then Tenant shall notify Landlord in writing of its reasonable objections to such Construction Plans, and the parties shall confer and negotiate in good faith to reach agreement on the Construction Plans. Promptly after the Construction Plans are approved by Landlord and Tenant, two (2) copies of such Construction Plans shall be initialed and dated by Landlord and Tenant, and Landlord shall promptly submit such Construction Plans to all appropriate Governmental Authorities for approval. The Construction Plans so approved, and all change orders specifically permitted by this Work Letter, are referred to herein as the “Approved Plans.”

2.3. Changes to the Tenant Improvements. Any changes to the Approved Plans (each, a “Change”) shall be requested and instituted in accordance with the provisions of this Article 2 and shall be subject to the written approval of the non-requesting party in accordance with this Work Letter.

(a) Change Request. Either Landlord or Tenant may request Changes after Tenant approves the Approved Plans by notifying the other party thereof in writing in substantially the same form as the AIA standard change order form (a “Change Request”), which Change Request shall detail the nature and extent of any requested Changes, including (a) the Change, (b) the party required to perform the Change and (c) any modification of the Approved Plans and the Schedule, as applicable, necessitated by the Change, If the nature of a Change requires revisions to the Approved Plans, then the requesting party shall be solely responsible for the cost and expense of such revisions and any increases in the cost of the Tenant Improvements as a result of such Change; provided that if any funds remain available from the Base TI Allowance following Substantial Completion of the Tenant Improvements, then such funds shall be used to pay for the cost of such Change. Change Requests shall be signed by the requesting party’s Authorized Representative.

(b) Approval of Changes. All Change Requests shall be subject to the other party’s prior written approval, which approval shall not be unreasonably withheld, conditioned or delayed. The non-requesting party shall have five (5) business days after receipt of a Change Request to notify the requesting party in writing of the non-requesting party’s decision either to approve or object to the Change Request. The non-requesting party’s failure to respond within such five (5) business day period shall be deemed approval by the non-requesting party.

3. Requests for Consent. Except as otherwise provided in this Work Letter, Tenant shall respond to all requests for consents, approvals or directions made by Landlord pursuant to this Work Letter within five (5) days following Tenant’s receipt of such request. Tenant’s failure to respond within such five (5) day period shall be deemed approval by Tenant.

B-3

4. TI Allowance.

4.1. Application of TI Allowance. Landlord shall contribute, in the following order, the Base TI Allowance; if properly requested by Tenant pursuant to the terms of the Lease, the Additional TI Allowance; and any Excess TI Costs advanced by Tenant to Landlord toward the costs and expenses incurred in connection with the performance of the Tenant Improvements, in accordance with Article 4 of the Lease. If the entire TI Allowance is not applied toward or reserved for the costs of the Tenant Improvements, then Tenant shall not be entitled to a credit of such unused portion of the TI Allowance. If the entire Excess TI Costs advanced by Tenant to Landlord are not applied toward the costs of the Tenant Improvements, then Landlord shall promptly return such excess to Tenant following completion of the Tenant Improvements. Tenant may apply the Base TI Allowance and, if properly requested by Tenant pursuant to the terms of the Lease, the Additional TI Allowance for the payment of construction and other costs in accordance with the terms and provisions of the Lease.

4.2. Approval of Budget for the Tenant Improvements. Notwithstanding anything to the contrary set forth elsewhere in this Work Letter or the Lease, Landlord shall not have any obligation to expend any portion of the TI Allowance until Landlord and Tenant shall have approved in writing the budget for the Tenant Improvements (the “Approved Budget”), which Landlord shall provide as soon as commercially reasonable following full execution of the Lease. Prior to Landlord’s approval of the Approved Budget, Tenant shall pay all of the costs and expenses incurred in connection with the Tenant Improvements as they become due and Landlord shall promptly reimburse Tenant for any such costs and expenses reflected in and upon the mutual approval of the Approved Budget. Tenant shall promptly reimburse Landlord for costs or expenses relating to the Tenant Improvements that exceed the amount of the TI Allowance.

5. Miscellaneous.

5.1. Number; Headings. Where applicable in this Work Letter, the singular includes the plural and the masculine or neuter includes the masculine, feminine and neuter. The section headings of this Work Letter are not a part of this Work Letter and shall have no effect upon the construction or interpretation of any part hereof.

5.2. Attorneys’ Fees. If either party commences an action against the other party arising out of or in connection with this Work Letter, then the substantially prevailing party shall be entitled to have and recover from the other party reasonable attorneys’ fees, charges and disbursements and costs of suit.

5.3. Time of Essence. Time is of the essence with respect to the performance of every provision of this Work Letter in which time of performance is a factor.

5.4. Covenant and Condition. Each provision of this Work Letter performable by Tenant shall be deemed both a covenant and a condition.

B-4

5.5. Withholding of Consent. Whenever consent or approval of either party is required, that party shall not unreasonably withhold, condition or delay such consent or approval, except as may be expressly set forth to the contrary.

5.6. Invalidity. Any provision of this Work Letter that shall prove to be invalid, void or illegal shall in no way affect, impair or invalidate any other provision hereof, and all other provisions of this Work Letter shall remain in full force and effect and shall be interpreted as if the invalid, void or illegal provision did not exist.

5.7. Interpretation. The language in all parts of this Work Letter shall be in all cases construed as a whole according to its fair meaning and not strictly for or against either Landlord or Tenant.

5.8. Successors. Each of the covenants, conditions and agreements herein contained shall inure to the benefit of and shall apply to and be binding upon the parties hereto and their respective heirs; legatees; devisees; executors; administrators; and permitted successors, assigns, sublessees. Nothing in this Section shall in any way alter the provisions of the Lease restricting assignment or subletting.

5.9. Governing Law. This Work Letter shall be governed by, construed and enforced in accordance with the laws of the state in which the Premises are located, without regard to such state’s conflict of law principles.

5.10. Power and Authority. Tenant guarantees, warrants and represents that the individual or individuals signing this Work Letter have the power, authority and legal capacity to sign this Work Letter on behalf of and to bind all entities, corporations, partnerships, limited liability companies, joint venturers or other organizations and entities on whose behalf said individual or individuals have signed.

5.11. Counterparts. This Work Letter may be executed in one or more counterparts, each of which, when taken together, shall constitute one and the same document.

5.12. Amendments; Waiver. No provision of this Work Letter may be modified, amended or supplemented except by an agreement in writing signed by Landlord and Tenant. The waiver by Landlord of any breach by Tenant of any term, covenant or condition herein contained shall not be deemed to be a waiver of any subsequent breach of the same or any other term, covenant or condition herein contained.

5.13. Waiver of Jury Trial. To the extent permitted by Applicable Laws, the parties waive trial by jury in any action, proceeding or counterclaim brought by the other party hereto related to matters arising out of or in any way connected with this Work Letter; the relationship between Landlord and Tenant; Tenant’s use or occupancy of the Premises; or any claim of injury or damage related to this Work Letter or the Premises.

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B-5

IN WITNESS WHEREOF, Landlord and Tenant have executed this Work Letter to be effective on the date first above written.


LANDLORD:

BMR-▇▇▇▇ ▇▇▇▇▇▇▇ COURT LLC, a Delaware limited liability company

By:		/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
Name:		▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
Title:		VP, Real Estate Counsel

TENANT:

ATYR PHARMA, INC., a Delaware corporation

By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇
Name:		▇▇▇▇▇▇ ▇▇▇▇▇▇
Title:		VP, Intellectual Property

B-6

Exhibit 1 to Exhibit B

SCHEDULE

B-7

EXHIBIT C

ACKNOWLEDGEMENT OF TERM COMMENCEMENT DATE

AND TERM EXPIRATION DATE

THIS ACKNOWLEDGEMENT OF [PHASE 1] [PHASE 2] TERM COMMENCEMENT DATE AND TERM EXPIRATION DATE is entered into as of [ ], 2012, with reference to that certain Lease (the “Lease”) dated as of December [ ], 2011, by aTyr Pharma, Inc., a Delaware corporation (“Tenant”), in favor of BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC, a Delaware limited liability company (“Landlord”). All capitalized terms used herein without definition shall have the meanings ascribed to them in the Lease.

Tenant hereby confirms the following:

1. Tenant accepted possession of [Phase 1/Phase 2] on [ ], 2012.

2. To Tenant’s knowledge, [Phase 1/Phase 2] is in good order, condition and repair.

3. The [Phase 1/Phase 2] Tenant Improvements are Substantially Complete.

4. All conditions of the Lease to be performed by Landlord as a condition to the full effectiveness of the Lease have been satisfied, and Landlord has fulfilled all of its duties in the nature of inducements offered to Tenant to lease [Phase 1/Phase 2].

5. In accordance with the provisions of Article 4 of the Lease, the [Phase 1/Phase 2] Term Commencement Date is [ ], 2012, and, unless the Lease is terminated prior to the Term Expiration Date pursuant to its terms, the Term Expiration Date shall be [ ], 2012.

6. Tenant commenced occupancy of [Phase 1/Phase 2] for the Permitted Use on [ ], 2012.

7. The Lease is in full force and effect, and the same represents the entire agreement between Landlord and Tenant concerning the Premises[, except [ ]].

8. Tenant has no existing defenses against the enforcement of the Lease by Landlord, and there exist no offsets or credits against Rent owed or to be owed by Tenant.

9. The obligation to pay Rent is presently in effect and all Rent obligations on the part of Tenant under the Lease with respect to [Phase 1/Phase 2] commenced to accrue on [ ], 2012, with Base Rent payable on the dates and amounts set forth in the chart below:

C-1


Dates	Approximate Square Feet of Rentable Area	Base Rent per Square Foot of Rentable Area	Monthly Base Rent	Annual Base Rent
Months [ ]-[ ]	[ ]	$[ ] [monthly] [OR] [annually]	[ ]	[ ]

10. The undersigned Tenant has not made any prior assignment, transfer, hypothecation or pledge of the Lease or of the rents thereunder or sublease of the Premises or any portion thereof.

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C-2

IN WITNESS WHEREOF, Tenant has executed this Acknowledgment of [Phase 1/Phase 2] Term Commencement Date and Term Expiration Date as of the date first written above.


TENANT:

aTyr Pharma, Inc., a Delaware corporation

By:
Name:
Title:

C-3

EXHIBIT D

FORM OF ADDITIONAL TI ALLOWANCE ACCEPTANCE LETTER

[TENANT LETTERHEAD]

BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC

▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇

▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇

Attn: Vice President, Real Estate Counsel

[Date]

Re:

Additional TI Allowance

To Whom It May Concern:

This letter concerns that certain Lease dated as of December [ ], 2011 (the “Lease”), between BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC (“Landlord”) and aTyr Pharma, Inc. (“Tenant”). Capitalized terms not otherwise defined herein shall have the meanings given them in the Lease.

Tenant hereby notifies Landlord that it wishes to exercise its right to utilize the Additional TI Allowance pursuant to Article 4 of the Lease.

If you have any questions, please do not hesitate to call [ ] at ([ ]) [ ]-[ ].

Sincerely,

[Name]

[Title of Authorized Signatory]


cc:		▇▇▇▇ Lubushkin
		▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇
		▇▇▇▇ ▇▇▇▇▇▇▇
		▇▇▇▇▇ ▇▇▇▇▇▇▇▇

D-1

EXHIBIT E

FORM OF LETTER OF CREDIT

[On letterhead or L/C letterhead of Issuer.]

LETTER OF CREDIT

Date: , 200


				(the “Beneficiary”)


Attention:
L/C. No.:
Loan No.:

Ladies and Gentlemen:

We establish in favor of Beneficiary our irrevocable and unconditional Letter of Credit numbered as identified above (the “L/C”) for an aggregate amount of $ , expiring at :00 p.m, on or, if such day is not a Banking Day, then the next succeeding Banking Day (such date, as extended from time to time, the “Expiry Date”). “Banking Day” means a weekday except a weekday when commercial banks in are authorized or required to close.

We authorize Beneficiary to draw on us (the “Issuer”) for the account of (the “Account Party”), under the terms and conditions of this L/C.

Funds under this L/C are available by presenting the following documentation (the “Drawing Documentation”): (a) the original L/C and (b) a sight draft substantially in the form of Attachment 1, with blanks filled in and bracketed items provided as appropriate. No other evidence of authority, certificate, or documentation is required.

Drawing Documentation must be presented at Issuer’s office at on or before the Expiry Date by personal presentation, courier or messenger service, or fax. Presentation by fax shall be effective upon electronic confirmation of transmission as evidenced by a printed report from the sender’s fax machine. After any fax presentation, but not as a condition to its effectiveness, Beneficiary shall with reasonable promptness deliver the original Drawing Documentation by any other means. Issuer will on request issue a receipt for Drawing Documentation.

We agree, irrevocably, and irrespective of any claim by any other person, to honor drafts drawn under and in conformity with this L/C, within the maximum amount of this L/C, presented

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to us on or before the Expiry Date, provided we also receive (on or before the Expiry Date) any other Drawing Documentation this L/C requires.

We shall pay this L/C only from our own funds by check or wire transfer, in compliance with the Drawing Documentation.

If Beneficiary presents proper Drawing Documentation to us on or before the Expiry Date, then we shall pay under this L/C at or before the following time (the “Payment Deadline”): (a) if presentment is made at or before noon of any Banking Day, then the close of such Banking Day; and (b) otherwise, the close of the next Banking Day. We waive any right to delay payment beyond the Payment Deadline. If we determine that Drawing Documentation is not proper, then we shall so advise Beneficiary in writing, specifying all grounds for our determination, within one Banking Day after the Payment Deadline.

Partial drawings are permitted. This L/C shall, except to the extent reduced thereby, survive any partial drawings.

We shall have no duty or right to inquire into the validity of or basis for any draw under this L/C or any Drawing Documentation. We waive any defense based on fraud or any claim of fraud.

The Expiry Date shall automatically be extended by one year (but never beyond (the “Outside Date”)) unless, on or before the date 90 days before any Expiry Date, we have given Beneficiary notice that the Expiry Date shall not be so extended (a “Nonrenewal Notice”). We shall promptly upon request confirm any extension of the Expiry Date under the preceding sentence by issuing an amendment to this L/C, but such an amendment is not required for the extension to be effective. We need not give any notice of the Outside Date.

Beneficiary may from time to time without charge transfer this L/C, in whole but not in part, to any transferee (the “Transferee”). Issuer shall look solely to Account Party for payment of any fee for any transfer of this L/C. Such payment is not a condition to any such transfer. Beneficiary or Transferee shall consummate such transfer by delivering to Issuer the original of this L/C and a Transfer Notice substantially in the form of Attachment 2, purportedly signed by Beneficiary, and designating Transferee. Issuer shall promptly reissue or amend this L/C in favor of Transferee as Beneficiary. Upon any transfer, all references to Beneficiary shall automatically refer to Transferee, who may then exercise all rights of Beneficiary. Issuer expressly consents to any transfers made from time to time in compliance with this paragraph.

Any notice to Beneficiary shall be in writing and delivered by hand with receipt acknowledged or by overnight delivery service such as FedEx (with proof of delivery) at the above address, or such other address as Beneficiary may specify by written notice to Issuer. A copy of any such notice shall also be delivered, as a condition to the effectiveness of such notice, to: (or such replacement as Beneficiary designates from time to time by written notice).

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No amendment that adversely affects Beneficiary shall be effective without Beneficiary’s written consent.

This L/C is subject to and incorporates by reference: (a) the International Standby Practices 98 (“ISP 98”): and (b) to the extent not inconsistent with ISP 98, Article 5 of the Uniform Commercial Code of the State of New York.

Very truly yours,

[Issuer Signature]

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ATTACHMENT 1 TO EXHIBIT E

FORM OF SIGHT DRAFT

[BENEFICIARY LETTERHEAD]

TO:

[Name and Address of Issuer]

SIGHT DRAFT

AT SIGHT, pay to the Order of , the sum of United States Dollars ($ ). Drawn under [Issuer] Letter of Credit No. dated , .

[Issuer is hereby directed to pay the proceeds of this Sight Draft solely to the following account: .]

[Name and signature block, with signature or purported signature of Beneficiary]

Date:

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ATTACHMENT 2 TO EXHIBIT E

FORM OF TRANSFER NOTICE

[BENEFICIARY LETTERHEAD]

TO:

[Name and Address of Issuer] (the “Issuer”)

TRANSFER NOTICE

By signing below, the undersigned, Beneficiary (the “Beneficiary”) under Issuer’s Letter of Credit No. dated , (the “L/C”), transfers the L/C to the following transferee (the “Transferee”):

[Transferee Name and Address]

The original L/C is enclosed. Beneficiary directs Issuer to reissue or amend the L/C in favor of Transferee as Beneficiary. Beneficiary represents and warrants that Beneficiary has not transferred, assigned, or encumbered the L/C or any interest in the L/C, which transfer, assignment, or encumbrance remains in effect.

[Name and signature block, with signature or purported signature of Beneficiary]

Date: ]

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EXHIBIT F

RULES AND REGULATIONS

NOTHING IN THESE RULES AND REGULATIONS (“RULES AND REGULATIONS”) SHALL SUPPLANT ANY PROVISION OF THE LEASE. IN THE EVENT OF A CONFLICT OR INCONSISTENCY BETWEEN THESE RULES AND REGULATIONS AND THE LEASE, THE LEASE SHALL PREVAIL.

1. Neither Tenant nor Tenant’s employees, agents, contractors or invitees shall encumber or obstruct the common entrances, lobbies, elevators, sidewalks and stairways of the Building(s) or the Project or use them for any purposes other than ingress or egress to and from the Building(s) or the Project.

2. Except as specifically provided in the Lease, no sign, placard, picture, advertisement, name or notice shall be installed or displayed on any part of the outside of the Premises or the Building(s) without Landlord’s prior written consent. Landlord shall have the right to remove, at Tenant’s sole cost and expense and without notice, any sign installed or displayed in violation of this rule.

3. If Landlord objects in writing to any curtains, blinds, shades, screens, hanging plants or other objects attached to or used in connection with any window or door of the Premises or placed on any windowsill, and (a) such window, door or windowsill is visible from the exterior of the Premises and (b) such curtain, blind, shade, screen, hanging plant or other object is not included in plans approved by Landlord, then Tenant shall promptly remove said curtains, blinds, shades, screens, hanging plants or similar objects at its sole cost and expense.

4. No deliveries shall be made that impede or interfere with other tenants in or the operation of the Project.

5. Tenant shall not place a load upon any floor of the Premises that exceeds the load per square foot that (a) such floor was designed to carry or (b) is allowed by Applicable Laws. Fixtures and equipment that cause noises or vibrations that may be transmitted to the structure of the Building(s) to such a degree as to be objectionable to other tenants shall be placed and maintained by Tenant, at Tenant’s sole cost and expense, on vibration eliminators or other devices sufficient to eliminate such noises and vibrations to levels reasonably acceptable to Landlord and the affected tenants of the Project.

6. Tenant shall not use any method of heating or air conditioning other than that present at the Project and serving the Premises as of the Execution Date.

7. Tenant shall not install any radio, television or other antennae; cell or other communications equipment; or other devices on the roof or exterior walls of the Premises except in accordance with the Lease. Tenant shall not interfere with radio, television or other digital or electronic communications at the Project or elsewhere.

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8. Canvassing, peddling, soliciting and distributing handbills or any other written material within, on or around the Project (other than within the Premises) are prohibited. Tenant shall cooperate with Landlord to prevent such activities by Tenant or its employees, agents, contractors and invitees.

9. Tenant shall store all of its trash, garbage and Hazardous Materials within its Premises or in receptacles designated by Landlord outside of the Premises. Tenant shall not place in any such receptacle any material that cannot be disposed of in the ordinary and customary manner of trash, garbage and Hazardous Materials disposal. Any Hazardous Materials transported through Common Areas shall be held in secondary containment devices.

10. The Premises shall not be used for lodging or for any improper, immoral or objectionable purpose. No cooking shall be done or permitted in the Premises; provided, however, that Tenant may use (a) equipment approved in accordance with the requirements of insurance policies that Landlord or Tenant is required to purchase and maintain pursuant to the Lease for brewing coffee, tea, hot chocolate and similar beverages, (b) microwave ovens for employees’ use and (c) equipment shown on Tenant Improvement plans approved by Landlord; provided, further, that any such equipment and microwave ovens are used in accordance with Applicable Laws.

11. Tenant shall not, without Landlord’s prior written consent, use the name of the Project, if any, in connection with or in promoting or advertising Tenant’s business except as Tenant’s address.

12. Tenant shall comply with all safety, fire protection and evacuation procedures and regulations established by Landlord or any Governmental Authority.

13. Tenant assumes any and all responsibility for protecting the Premises from theft, robbery and pilferage, which responsibility includes keeping doors locked and other means of entry to the Premises closed.

14. Tenant shall furnish Landlord with copies of keys, pass cards or similar devices for locks to the Premises.

15. Tenant shall cooperate and participate in all reasonable security programs affecting the Premises.

16. Tenant shall not permit any animals in the Project, other than for guide animals or for use in laboratory experiments.

17. Bicycles shall not be taken into the Building(s) except into areas designated by Landlord.

18. The water and wash closets and other plumbing fixtures shall not be used for any purposes other than those for which they were constructed, and no sweepings, rubbish, rags or other substances shall be deposited therein.

19. Discharge of industrial sewage shall only be permitted if Tenant, at its sole expense, first obtains all necessary permits and licenses therefor from all applicable Governmental Authorities.

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20. Smoking is prohibited at the Project.

21. The Project’s hours of operation are currently 24 hours a day seven days a week.

22. Tenant shall comply with all orders, requirements and conditions now or hereafter imposed by Applicable Laws or Landlord (“Waste Regulations”) regarding the collection, sorting, separation and recycling of waste products, garbage, refuse and trash generated by Tenant (collectively, “Waste Products”), including (without limitation) the separation of Waste Products into receptacles reasonably approved by Landlord and the removal of such receptacles in accordance with any collection schedules prescribed by Waste Regulations.

23. Tenant, at Tenant’s sole cost and expense, shall cause the Premises to be exterminated on a monthly basis to Landlord’s reasonable satisfaction and shall cause all portions of the Premises used for the storage, preparation, service or consumption of food or beverages to be cleaned daily in a manner reasonably satisfactory to Landlord, and to be treated against infestation by insects, rodents and other vermin and pests whenever there is evidence of any infestation. Tenant shall not permit any person to enter the Premises or the Project for the purpose of providing such extermination services, unless such persons have been approved by Landlord. If requested by Landlord, Tenant shall, at Tenant’s sole cost and expense, store any refuse generated in the Premises by the consumption of food or beverages in a cold box or similar facility.

Landlord may waive any one or more of these Rules and Regulations for the benefit of Tenant or any other tenant, but no such waiver by Landlord shall be construed as a waiver of such Rules and Regulations in favor of Tenant or any other tenant, nor prevent Landlord from thereafter enforcing any such Rules and Regulations against any or all of the tenants of the Project, including Tenant. These Rules and Regulations are in addition to, and shall not be construed to in any way modify or amend, in whole or in part, the terms covenants, agreements and conditions of the Lease. Landlord reserves the right to make such other and reasonable rules and regulations as, in its judgment, may from time to time be needed for safety and security, the care and cleanliness of the Project, or the preservation of good order therein; provided, however, that Tenant shall not be obligated to adhere to such additional rules or regulations until Landlord has provided Tenant with written notice thereof. Tenant agrees to abide by these Rules and Regulations and any additional rules and regulations issued or adopted by Landlord. Tenant shall be responsible for the observance of these Rules and Regulations by Tenant’s employees, agents, contractors and invitees.

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EXHIBIT G

FORM OF ESTOPPEL CERTIFICATE


To:		BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC
		▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇
		▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
		Attention: Vice President, Real Estate Counsel

		BioMed Realty, L.P.
		▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇
		▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇

Re:		▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇ (the “Premises”) at 3545-3575 ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇ (the “Property”)

The undersigned tenant (“Tenant”) hereby certifies to you as follows:

1. Tenant is a tenant at the Property under a lease (the “Lease”) for the Premises dated as of December [ ], 2011. The Lease has not been cancelled, modified, assigned, extended or amended [except as follows: [ ]], and there are no other agreements, written or oral, affecting or relating to Tenant’s lease of the Premises or any other space at the Property. The lease term expires on [ ], 20[ ].

2. Tenant took possession of the Premises, currently consisting of [ ] square feet, on [ ], 20[ ], and commenced to pay rent on [ ], 20[ ]. Tenant has full possession of the Premises, has not assigned the Lease or sublet any part of the Premises, and does not hold the Premises under an assignment or sublease[, except as follows: [ ]].

3. All base rent, rent escalations and additional rent under the Lease have been paid through [ ], 20[ ]. There is no prepaid rent[, except $[ ]][, and the amount of security deposit is $[ ] [in cash][OR][in the form of a letter of credit]]. Tenant currently has no right to any future rent abatement under the Lease.

4. Base rent is currently payable in the amount of $[ ] per month.

5. Tenant is currently paying estimated payments of additional rent of $[ ] per month on account of real estate taxes, insurance, management fees and common area maintenance expenses.

6. All work to be performed for Tenant under the Lease has been performed as required under the Lease and has been accepted by Tenant[, except [ ]], and all allowances to be paid to Tenant, including allowances for tenant improvements, moving expenses or other items, have been paid.

7. The Lease is in full force and effect, free from default and free from any event that could become a default under the Lease, and Tenant has no claims against the landlord or

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offsets or defenses against rent, and there are no disputes with the landlord. Tenant has received no notice of prior sale, transfer, assignment, hypothecation or pledge of the Lease or of the rents payable thereunder[, except [ ]].

8. Tenant has no rights or options to purchase the Property.

9. To Tenant’s knowledge, no hazardous wastes have been generated, treated, stored or disposed of by or on behalf of Tenant in, on or around the Premises or the Project in violation of any environmental laws.

10. The undersigned has executed this Estoppel Certificate with the knowledge and understanding that [INSERT NAME OF LANDLORD, PURCHASER OR LENDER, AS APPROPRIATE] or its assignee is acquiring the Property in reliance on this certificate and that the undersigned shall be bound by this certificate. The statements contained herein may be relied upon by [INSERT NAME OF PURCHASER OR LENDER, AS APPROPRIATE], [LANDLORD], BioMed Realty, L.P., BioMed Realty Trust, Inc., and any [other] mortgagee of the Property and their respective successors and assigns.

Any capitalized terms not defined herein shall have the respective meanings given in the Lease.

Dated this [ ] day of [ ], 20[ ].

[ ],

a [ ]


By:
Name:
Title:

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EXHIBIT H

FORM OF CONVERTIBLE UNSECURED PROMISSORY NOTE

H-1

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”). OR ANY STATE SECURITIES LAWS. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM. HOLDERS SHOULD BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME.

SUBORDINATED CONVERTIBLE UNSECURED PROMISSORY NOTE

December 22, ▇▇▇▇

▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇

For value received, aTyr Pharma, Inc., a Delaware corporation (the “Company”), promises to pay to BioMed Realty, L.P., a Maryland limited partnership (“Holder”), the principal amount of Two Million Dollars ($2,000,000.00) (the “Principal Amount”). Reference is made to that certain Lease, dated as of December 22, 2011, as amended from time to time (the “Lease”), by and between the Company and BMR-▇▇▇▇ ▇▇▇▇▇▇▇ Court LLC, a wholly owned subsidiary of Holder (“Landlord”). Capitalized terms used herein but not defined herein shall have the meanings ascribed to them in the Lease. Interest on the Principal Amount shall accrue, compounded annually, at a rate equal to eight percent (8%) per annum (the “Interest Rate”), commencing on the date hereof. The Interest Rate shall be computed on the basis of the actual number of days elapsed and a year of 365 days. This Subordinated Convertible Unsecured Promissory Note (this “Note”) is subject to the following terms and conditions.

1 Maturity. Unless earlier converted pursuant to Section 3 hereof, the principal and any accrued but unpaid interest under this Note shall be due and payable on the earliest of (i) the three-year anniversary of the Phase I Term Commencement Date under the Lease, (ii) a Liquidation Event (as defined in the Company’s Amended and Restated Certificate of Incorporation as amended from time to time (the “COI”)) or (iii) the closing of an initial firm commitment underwritten public offering of common stock of the Company pursuant to a registration statement under the Act (such date, the “Maturity Date”).

2 Payment.

2.1 Unless this Note is converted pursuant to Section 3 hereof, or interest hereunder is forgiven pursuant to Section 9 hereof, any Principal Amount and any accrued but unpaid interest under this Note then outstanding shall be due and payable on the Maturity Date. Payment shall be credited first to costs of collection or enforcement, if any, then to accrued interest due and payable through such payment date, and the remainder applied to the Principal Amount.

2.2 With the prior written consent of the Holder, the Company may prepay this Note in full, but not in part. The Company shall deliver to the Holder written notice of its

intended prepayment at least twenty (20) days in advance of the intended prepayment date.

3 Conversion of the Note.

3.1 Elective Conversion into New Preferred Stock. If the Company completes a Threshold New Preferred Financing, then at any time prior to the Maturity Date, at Holder’s election and exercisable by written notice to the Company, Holder may elect to convert, in whole but not in part, the Principal Amount into that number of fully paid and nonassessable shares of the Company’s New Preferred Stock equal to the quotient obtained by dividing the Principal Amount by the New Series Price (as equitably adjusted to reflect any stock split, stock dividend, combination, consolidation, reorganization, recapitalization, reclassification or other similar event involving the New Preferred Stock after the date of issuance of the New Preferred Stock, but excluding any Stock Distribution (as defined below) received by Holder). Upon conversion into New Preferred Stock, Holder agrees to execute and shall become a party to and have substantially the same rights as the other holders of New Preferred Stock, including, but not limited to, those rights as set forth in the COI, any stock purchase agreement, registration rights agreement, investor rights agreement, voting agreement or similar agreement governing the New Preferred Stock and/or the holders thereof in effect as of the date of conversion. For the avoidance of doubt, if the Company completes a Threshold New Preferred Financing, Holder shall have the rights of conversion set forth in this Section 3.1, and shall not have rights of conversion as set forth in Section 3.2 below.

3.2 Elective Conversion into Series C Preferred Stock. If the Company does not complete a Threshold New Preferred Financing, or effects a Liquidation Event prior to a Threshold New Preferred Financing, then at any time and from time to time following the earlier of (i) Holder’s receipt of notice of the Liquidation Event under Section 14 below and (ii) June 30, 2013, at Holder’s election and exercisable by written notice to the Company, Holder may elect to convert, in whole but not in part, the Principal Amount into 1,934,236 fully paid and nonassessable shares of Series C Preferred Stock of the Company (as equitably adjusted to reflect any stock split, stock dividend, combination, consolidation, reorganization, recapitalization, reclassification or other similar event involving the Series C Preferred Stock after the Effective Time (as defined in the COI), but excluding any Stock Distribution received by Holder). Upon conversion into Series C Preferred Stock, Holder agrees to execute and shall become a party to and have substantially the same rights as the other holders of Series C Preferred Stock, including, but not limited to, those rights as set forth in the COI, any stock purchase agreement, registration rights agreement, investor rights agreement, voting agreement or similar agreement governing the Series C Preferred Stock and/or the holders thereof in effect as of the date of conversion. The Company shall take all actions reasonably necessary to give effect to the conversion rights set forth in this Section 3.

For purposes of this Note:

“Threshold New Preferred Financing” means the sale (or series of related sales) by the Company of New Preferred Stock on or before June 30, 2013 to one or more investors in an aggregate amount of not less than Fifteen Million Dollars ($15,000,000.00) (excluding the exchange, conversion or cancellation of this Note or any notes or warrants issued prior to the date hereof), which includes at least one investor (who is not a current investor in the Company as of the date hereof) that commits Two Million Dollars ($2,000,000.00) or more in such financing.

“New Series Price” means the lowest price paid per share for the New Preferred Stock by investors in the Threshold New Preferred Financing.

“New Preferred Stock” means the Company’s series of preferred stock issued in connection with the Threshold New Preferred Financing.

3.3 Mechanics and Effect of Conversion. Upon conversion of this Note, any interest payable in respect of the Principal Amount shall be immediately forgiven and shall not converted into New Preferred Stock, Series C Preferred Stock or any other shares of the capital stock of the Company. No fractional shares of the Company’s capital stock will be issued upon conversion of the Note. In lieu of any fractional share to which Holder would otherwise be entitled, the Company will pay to Holder in cash the amount of the unconverted principal balance of the Note that would otherwise be converted into such fractional share. Upon conversion of the Note pursuant to this Section 3. Holder shall surrender the Note, duly endorsed, at the principal offices of the Company or any transfer agent of the Company (or a notice to the effect that the original Note has been lost, stolen or destroyed and an agreement reasonably acceptable to the Company whereby the Holder agrees to indemnify the Company from any loss incurred by it in connection with this Note); provided, that upon conversion pursuant hereto, this Note shall be deemed cancelled and of no further force and effect, whether or not it is delivered for cancellation as set forth in this sentence. At its expense, the Company will, as soon as practicable and in any event within ten (10) days thereafter, issue and deliver to Holder, at Holder’s principal office, a certificate or certificates for the number of shares to which Holder is entitled upon such conversion, and a check payable to Holder for any cash amounts payable as described herein. Upon conversion of this Note, the Company will be forever released from all of its obligations and liabilities under this Note with regard to the Principal Amount being converted and any interest which has accrued thereon, including without limitation the obligation to pay such portion of the Principal Amount and any accrued interest.

3.4 No Rights as Stockholder. This Note does not by itself entitle the Holder to any voting rights or other rights as a stockholder of the Company, other than as set forth in Section 9 below. In the absence of conversion of this Note, no provision of this Note, and no enumeration herein of the rights or privileges of the Holder shall cause the Holder to be a stockholder of the Company for any purpose, other than as set forth in Section 9 below.

4 Representations and Warranties of the Company. The Company represents and warrants to Holder as of the date hereof, and with respect to Sections 4.6 and 4.7 for so

long as Holder, or an affiliate of Holder, holds the Note or any equity securities issued to Holder pursuant to the terms hereof, as follows:

4.1 Organization, Good Standing and Qualification. The Company is a corporation duly organized, validly existing and in good standing under the laws of the State of Delaware and has all requisite corporate power and authority to own and operate its properties and assets and to carry on its business as presently conducted. The Company is duly qualified to transact business and is in good standing in each jurisdiction in which the failure so to qualify would have a material adverse effect on its business or properties.

4.2 Authorization. All corporate action on the part of the Company, its officers, directors and stockholders necessary for the authorization, sale, issuance and delivery of the Note and the performance of all obligations of the Company under the Note has been taken prior to the date hereof. The Note constitutes a valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms, except (i) as limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance and other laws of general application affecting enforcement of creditors’ rights generally, and (ii) as limited by laws relating to the availability of specific performance, injunctive relief or other equitable remedies. Any equity securities of the Company or of any Related Entity (as defined below) issuable to Holder hereunder have been or will be duly reserved for issuance, and upon issuance in accordance with the terms of the Note, will be validly issued, fully paid and non- assessable and free of restrictions on transfer other than restrictions contained in this Note and applicable federal and state securities laws. The issuance of the Note and the issuance of any such equity securities issuable hereunder are not and will not be subject to preemptive rights of any present or future debt or equity holders of the Company or any Related Entity.

4.3 Governmental Consent. No consent, approval, order or authorization of, or registration, qualification, designation, declaration or filing with, any federal, state or local governmental authority on the part of the Company is required in connection with the valid execution, delivery and performance by the Company of the Note and the transactions contemplated thereby, except for filings pursuant to Section 25102(f) of the California Corporate Securities Law of 1968, as amended, and the rules thereunder, other applicable state securities laws and Regulation D of the Act, all of which filings will be timely effected after the date hereof.

4.4 Compliance with Other Instruments. The Company is not in violation or default of any provision of its COI or bylaws currently in effect. The Company is not in violation of, or default under any provision of any instrument, mortgage, deed of trust, loan, contract, commitment or obligation to which it is a party or by which it or any of its properties are bound, which violations or defaults, individually or in the aggregate, would materially adversely affect the business, properties or condition (financial or otherwise) of the Company. The Company is not in violation of any provision of any federal, state or local statute, rule or governmental regulation which would materially adversely affect the business, properties or condition (financial or otherwise) of the Company or any judgment, decree or order to which it is a party. The Company has all franchises,

permits, licenses and any similar authority necessary for the conduct of its business, the lack of which could materially adversely affect the business, properties or condition (financial or otherwise) of the Company. The Company is not in default in any material respect under any of such franchises, permits, licenses or other similar authority.

4.5 Percentage of Outstanding Securities. This Note, together with the aggregate securities actually issued and/or potentially issuable under this Note (assuming for this purpose conversion of the Note into shares of Series C Preferred Stock pursuant to Section 3.2 above), represent less than ten percent (10.0%) of the voting interest and less than ten percent (10.0%) of the value of the outstanding debt and equity securities of the Company or any Related Entity, as applicable.

4.6 Health Care / Lodging Facilities. Neither the Company nor any Related Entity currently operates or manages, or in the future will operate or manage, any health care facilities (including a congregate care facility or assisted living facility) or lodging facilities or provide any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated.

4.7 Financial Information. The Company shall furnish to Holder, as soon as practicable and in any event within ten (10) days after the date of such request, a statement showing the capitalization of the Company and any Related Entity, including but not limited to the total number of outstanding securities of each class and series of capital stock of the Company and such Related Entity, in sufficient detail as to permit Holder to calculate its percentage ownership in securities of the Company and such Related Entity and voting power to elect directors to their respective Board of Directors.

5 Representations and Warranties of Holder. Holder hereby represents and warrants to the Company as of the date hereof that:

5.1 Experience. Holder is experienced in investing in the securities of development stage companies such as die Company and acknowledges that investment in the Securities (as defined below) involves a number of significant risks, it is able to fend for itself, it can bear the economic risk of its investment, including the full loss of its investment, and it has such knowledge and experience in financial or business matters that it is capable of evaluating the merits and risks of the investment in the Securities. Holder also represents it was not organized solely for the purpose of acquiring the Securities. As used herein, “Securities” shall mean this Note and the equity securities issuable hereunder (and the securities issuable upon conversion of such equity securities).

5.2 Accredited Investor. Holder represents that it is an “accredited investor” within the meaning of Rule 501(a) of the Act.

5.3 Purchase Entirely for Own Account. This Note is issued to Holder in reliance upon Holder’s representation to the Company, which by Holder’s purchase of this Note, Holder hereby confirms, that the Securities to be received by Holder will be acquired for investment for Holder’s own account, not as a nominee or agent, and not with a view to the resale or distribution of any part thereof, and that Holder has no present intention of

selling, granting any participation in, or otherwise distributing the same. Holder further represents that it does not have any contract, undertaking, agreement or arrangement with any person to sell, transfer or grant participations to such person or to any third person, with respect to the Securities.

5.4 Restricted Securities. Holder understands that the Securities are characterized as “restricted securities” under the federal securities laws inasmuch as they are being acquired from the Company in a transaction not involving a public offering and that under such laws and applicable regulations such Securities may be resold without registration under the Act only in certain limited circumstances. In this connection, Holder represents that it is familiar with Rule 144, as presently in effect, and understands the resale limitations imposed thereby and by the Act. Holder must bear the economic risk of this investment indefinitely unless the Securities are registered pursuant to the Act, or an exemption from registration is available. Holder understands that the Company has no present intention of registering the Securities. Holder also understands that there is no assurance that any exemption from registration under the Act will be available and that, even if available, such exemption may not allow Holder to transfer all or any portion of the Securities under the circumstances, in the amounts or at the times Holder might propose.

5.5 No Public Market. Holder understands that no public market now exists for any of the securities issued by the Company and that the Company has made no assurances that a public market will ever exist for the Securities.

6 Restrictions on Transfer. Holder hereby acknowledges that the Securities shall not be transferred except upon the conditions specified in this Section 6, which conditions are intended to insure compliance with the provisions of the Act. Holder may not assign, pledge, or otherwise transfer this Note without the prior written consent of the Company, except for transfers to any of the Holder’s affiliates, partners, members, affiliated funds or entities under common control, or to the estate of any of its partners or members. Holder will cause any proposed transferee of Securities held by Holder to agree to take and hold such Securities subject to the provisions and upon the conditions specified in the Note.

6.1 Legends. Each certificate representing the Securities or any securities of the Company issued to Holder upon any stock split, stock dividend, recapitalization, merger, consolidation or similar event, shall (unless otherwise permitted or unless the securities evidenced by such certificate shall have been registered under the Act) be stamped or otherwise imprinted with a legend substantially in the following form (in addition to any legend required under applicable state securities laws):

“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR ANY STATE SECURITIES LAWS. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER

THE ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM. HOLDERS SHOULD BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME.”

6.2 Notice of Proposed Transfers. The holder of each certificate representing the Securities required to bear the legend set forth in Section 6.1 by acceptance thereof agrees to comply in all respects with the provisions of this Section 6. Prior to any proposed transfer of any Securities, the holder thereof shall give written notice to the Company of such holder’s intention to effect such transfer. Each such notice shall describe the manner and circumstances of the proposed transfer in sufficient detail, and shall be accompanied (except in transactions involving the distribution without consideration of such Securities by a holder to any of its affiliates, partners, members, affiliated funds or entities under common control, or to die estate of any of its partners or members) by either:

6.2.1 a written opinion of legal counsel who shall be reasonably satisfactory to the Company, addressed to the Company and reasonably satisfactory in form and substance to the Company’s counsel, to the effect that the proposed transfer of the Securities may be effected without registration under the Act; or

6.2.2 a “no-action” letter from the Securities and Exchange Commission to the effect that the distribution of such Securities without registration will not result in a recommendation by the staff of the Securities and Exchange Commission that action be taken with respect thereto, whereupon the holder of such Securities shall be entitled to transfer such Securities in accordance with the terms of the notice delivered by such holder to the Company.

Each certificate evidencing the Securities transferred as above provided shall bear the restrictive legend set forth in Section 6.1 above, except that such certificate shall not bear such restrictive legend if the opinion of counsel or “no-action” letter referred to above expressly indicates that such legend is not required in order to establish compliance with the Act or if such legend is no longer required pursuant to Rule 144. Notwithstanding the foregoing, Holder may transfer the Securities at any time to an affiliate of Holder as deemed necessary or advisable, in Holder’s discretion, to ensure BioMed Realty Trust, Inc.’s compliance with requirements relating to BioMed Realty Trust, Inc.’s status as a real estate investment trust for federal income tax purposes, without having to provide to the Company the documentation contained in Section 6.2.1 or 6.2.2.

7 Assignment. Subject to the restrictions on transfer set forth in Section 6 and this Section 7 of the Note, the rights and obligations of the Company and Holder will be binding upon and inure to the benefit of the successors, assigns, heirs, administrators and transferees of the parties.

8 Events of Default. Upon the occurrence or existence of any Event of Default (as defined below) and at any time thereafter during the continuance of an Event of Default,

the entire Principal Amount of this Note, together with all unpaid accrued interest thereon, and all unpaid fees, charges, costs and expenses, if any, owed by the Company to the Holder hereunder, may become or may be declared by the Holder to be immediately due and payable. In addition to the foregoing remedies, upon the occurrence or existence of any Event of Default, the Holder may exercise any other right, power or remedy permitted to it by applicable law, either by suit in equity or by action at law, or both.

8.1 Events of Default. The occurrence of any one or more of the following events with respect to the Company constitutes an “Event of Default” hereunder:

(a) The Company breaches any covenant or obligation in this Note, and fails to cure such breach within thirty (30) days of such breach;

(b) The Company fails to pay timely any of the Principal Amount due under this Note on the date the same becomes due and payable or any accrued interest or other amounts due under this Note on the date the same becomes due and payable;

(c) The dissolution, termination of existence of the Company or inability of the Company to pay its debts as they become due, or appointment of a receiver, trustee or custodian, for all or any part of the property of the Company under any reorganization, bankruptcy, insolvency, arrangement, readjustment of debt, dissolution or liquidation law or statute of any jurisdiction, now or in the future in effect; or

(d) The commencement of any proceeding against the Company under any reorganization, bankruptcy, insolvency, arrangement, readjustment of debt, dissolution or liquidation law or statute of any jurisdiction, now or in the future, if within sixty (60) days after the commencement of such proceeding (i) such action has not been dismissed or all orders or proceedings thereunder affecting the operations or the business of the Company stayed, or (ii) the stay of any such order or proceedings has been set aside.

8.2 Default Rate. As long as any payment due under this Note remains past due (whether at the stated maturity, by acceleration or otherwise) for five (5) days or more, interest under this Note shall accrue on such overdue payment at a rate (the “Default Rate”) (which is in lieu of and not in addition to the Interest Rate) equal to the lesser of twelve percent (12%) per annum or the maximum rate permitted by applicable law from the date of such non-payment until such amount is paid in full (whether after or before judgment).

8.3 Payment of Expenses. Following the occurrence of an Event of Default, the Company shall pay, on demand, all reasonable costs and expenses of collection of this Note (including reasonable attorneys’ fees, costs and disbursements) in respect of such Event of Default, whether or not any suit or other legal proceedings shall be instituted.

8.4 No Usury. Payments of interest shall not be required, for any period for which interest is computed hereunder, to the extent that contracting for or receipt thereof would

be contrary to provisions of any applicable law to the Holder limiting the highest rate of interest that may be lawfully contracted for, charged or received by the Holder, as determined by a final judgment of a court of competent jurisdiction. Any interest paid in excess of such highest rate shall be applied to the unpaid principal balance of this Note. In the event that any such excess exceeds the principal amount, the amount of such xcess over the principal amount shall be refunded to the Company.

9 Certain Stock Distributions. In the case of any stock dividend, stock distribution or similar transaction (any such transaction, a “Stock Distribution”) by the Company of shares of the capital stock or other securities of any Related Entity (“Distribution Securities”) after the date of issuance of this Note and prior to the conversion of this Note by Holder, Holder shall be entitled to receive, and the Company shall promptly deliver to Holder, such number of the Distribution Securities as shall be issued or distributed pursuant to such Stock Distribution as if Holder is a holder of 1,934,236 shares of Series C Preferred Stock of the Company (as equitably adjusted to reflect any stock split, stock dividend, combination, consolidation, reorganization, recapitalization, reclassification or other similar event involving the Series C Preferred Stock after the Effective Time) (such shares of Series C Preferred Stock, the “Deemed Held Stock”) as of the record date determined by the Company’s Board of Directors for such Stock Distribution. Holder shall be deemed to be a holder of such Deemed Held Stock solely for purposes of this Section 9 and shall otherwise have no other rights in, to or by reason of this Section 9 in the Deemed Held Stock, including, but not limited to, any rights of a stockholder or rights otherwise associated with ownership of shares of capita] stock. The right of the Holder to receive any Distribution Securities pursuant to this Section 9 is subject to and conditioned upon Holder agreeing to enter into such agreements with the Company and/or any Related Entity as the holders of a majority of the shares of Series C Preferred Stock of the Company have entered into and/or are subject to with respect to such holders’ ownership of any Distribution Securities; provided that if Holder receives any Distribution Securities from the Company and thereafter elects not to convert the Note prior to the Maturity Date, upon payment in full by the Company of any and all principal and interest then due and payable hereunder, Holder shall promptly surrender all such Distribution Securities to the Company (or such Related Entity as may be designated by the Company) and waive any and all rights in and to such securities. As used herein, “Related Entity” shall mean any entity initially formed, organized or otherwise established as a subsidiary or other affiliate of the Company, either prior to, at or after the date of this Note, regardless of whether or not the Company thereafter continues to hold any equity or other ownership interest therein. In the event that Holder receives aggregate cash proceeds derived from Holder’s Distribution Securities exceeding Three Million Five Hundred Thousand Dollars ($3,500,000.00) prior to the Maturity Date, then any accrued but unpaid interest under this Note shall be forgiven and no interest under this Note shall thereafter accrue or otherwise be payable by the Company with respect hereto.

10 Subordination. Holder agrees that payment of amounts due under this Note is expressly subordinated to the prior payment of, and shall rank junior in priority to, all amounts due by the Company under that certain Loan and Security Agreement dated as of March 18, 2011 by and between the Company and Comerica Bank (“Comerica”), as

the same may be amended from time to time. To the extent requested by Comerica, the Holder and the Company shall enter into a reasonable and customary subordination agreement providing for such subordination and other related terms as described in the preceding sentence.

11 Early Termination of Lease. If at any time prior to the Maturity Date the Lease terminates, other than as a result of a Default by the Company, a portion of the Principal Amount equal to the amount to be deemed as a credit against the Base Rent (as defined in the Lease) for months under the Lease which have not, as of such termination date, elapsed, shall immediately be forgiven and no longer deemed to be outstanding, due or otherwise payable hereunder.

12 Governing Law. This Note and all acts and transactions pursuant hereto and the rights and obligations of the parties hereto shall be governed, construed and interpreted in accordance with the laws of the State of California, without giving effect to principles of conflicts of law.

13 Notices. All notices and other communications required or permitted hereunder shall be in writing and shall be deemed effectively given upon personal delivery, upon three (3) business days after deposit with the United States Post Office, by registered or certified mail, return receipt requested, postage prepaid, one (1) business day after deposit with a nationally recognized air courier, or upon receipt of confirmation with regard to delivery by facsimile and addressed: (a) if to Holder, at Holder’s address as set forth on Holder’s signature page hereto, or at such other address as Holder shall have furnished to the Company in writing, or (b) if to the Company, at its current address or at such other address as the Company shall have furnished to Holder in writing.

14 Notification of Certain Events. The Company shall provide Holder with at least ten (10) days prior written notice of any Liquidation Event.

15 Amendments and Waivers. Any term of this Note may be amended and the observance of any term of this Note may be waived (either generally or in a particular instance and either retroactively or prospectively), only with the written consent of the Company and the Holder. Any amendment or waiver effected in accordance with this Section 15 shall be binding upon Holder and the Company.

16 Lost Documents. Upon receipt by the Company of evidence and indemnity reasonably satisfactory to it of the loss, theft, destruction or mutilation of, and upon surrender and cancellation of this Note, if mutilated, the Company will make and deliver in lieu of this Note a new note of the same series and of like tenor and unpaid Principal Amount and dated as of the date to which interest, if any, has been paid on the unpaid Principal Amount of this Note.

17 Waivers and Rights of Holder. The Company hereby waives demand, presentment for payment, protest, notice of nonpayment, notice of protest, notice of dishonor, and any other notices of any kind, and any and all exemption rights that it holds at law or in equity with respect to the indebtedness evidenced by this Note.

18 Attorneys’ Fees. If any action at law or in equity is necessary to enforce or interpret the terms of this Note, the prevailing party shall be entitled to reasonable attorneys’ fees, costs and disbursements in addition to any other relief to which such party may be entitled.

19 Severability. If one or more provisions of this Note are held to be unenforceable under applicable law, such provision shall be excluded from this Note and the balance of this Note shall be interpreted as if such provision were so excluded and shall be enforceable in accordance with its terms.

20 California Corporate Securities Law. THE SALE OF THE SECURITIES WHICH ARE THE SUBJECT OF THIS NOTE HAS NOT BEEN QUALIFIED WITH THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO THE QUALIFICATION IS UNLAWFUL UNLESS THE SALE OF SECURITIES IS EXEMPT FROM THE QUALIFICATION BY SECTION 25100, 25102, OR 25105 OF THE CALIFORNIA CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS NOTE ARE EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

21 Counterparts. This Note may be executed in two or more counterparts (including by facsimile or PDF copy), each of which shall be deemed an original and all of which together shall constitute one instrument.

(Signature Page Follows)

The parties have executed this Subordinated Convertible Unsecured Promissory Note as of the date first written above.


COMPANY:		HOLDER:

ATYR PHARMA, INC.		BIOMED REALTY, L.P.

By:	/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇	By:	/s/ ▇▇▇▇▇ ▇▇▇▇▇
Name:	▇▇▇▇▇▇ ▇▇▇▇▇▇	Name:	▇▇▇▇▇ ▇▇▇▇▇
Title:	VP, Intellectual Property	Title:	Corporate Counsel, Asst. Secretary

		Address:	▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇▇, ▇▇ ▇▇▇▇▇ Attn: Corporate Legal

IN WITNESS WHEREOF, the parties hereto have executed this Lease as of the date first above written.


LANDLORD:

BMR-▇▇▇▇ ▇▇▇▇▇▇▇ COURT LLC, a Delaware limited liability company

By:		/s/ Brain ▇▇▇▇▇
Name:		▇▇▇▇▇ ▇▇▇▇▇
Title:		Corporate Counsel, Asst. Secretary

TENANT:

ATYR PHARMA, INC., a Delaware corporation

By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇
Name:		▇▇▇▇▇▇ ▇▇▇▇▇▇
Title:		VP, Intellectual Property

If the foregoing accurately sets forth the agreements that the Company and BioMed have reached with respect to the subject matter hereof, please indicate your agreement to the terms contained herein by countersigning in the place indicated below.


Sincerely,

ATYR PHARMA, INC.

By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇
Name:		▇▇▇▇▇▇ ▇▇▇▇▇▇
Title:		VP, Intellectual Property


AGREED AND ACCEPTED:

BIOMED REALTY, L.P.

By:		/s/ ▇▇▇▇▇ ▇▇▇▇▇
Name:		▇▇▇▇▇ ▇▇▇▇▇
Title:		Corporate Counsel, Asst. Secretary

LEASE by and between BMR-John Hopkins Court LLC, a Delaware limited liability company and aTyr Pharma, Inc., a Delaware corporation

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