SHORELINE TECHNOLOGY PARK
                            MOUNTAIN VIEW CALIFORNIA
                             OFFICE LEASE AGREEMENT
                                    BETWEEN
   EOP-SHORELINE TECHNOLOGY PARK, L.L.C., a Delaware limited liability company
                                  ("LANDLORD")
                                      AND
               COMMTOUCH SOFTWARE, INC., a California corporation
                                   ("TENANT")
                               TABLE OF CONTENTS
I.      Basic Lease Information .............................................  1
II.     Lease Grant .........................................................  3
III.    Possession ..........................................................  3
IV.     Rent ................................................................  4
V.      Compliance with Laws; Use ...........................................  8
VI.     Security Deposit ....................................................  8
VII.    Services to be Furnished by Landlord ................................  8
VIII.   Leasehold Improvements ..............................................  9
IX.     Repairs, Maintenance and Alterations ................................  9
X.      Use of Utility Services by Tenant ................................... 11
XI.     Entry by Landlord ................................................... 12
XII.    Assignment and Subletting ........................................... 12
XIII.   Liens ............................................................... 13
XIV.    Indemnity and Waiver of Claims ...................................... 14
XV.     Insurance ........................................................... 14
XVI.    Subrogation ......................................................... 15
XVII.   Casualty Damage ..................................................... 15
XVIII.  Condemnation ........................................................ 15
XIX.    Events of Default ................................................... 16
XX.     Remedies ............................................................ 16
XXI.    Limitation of Liability ............................................. 18
XXII.   No Waiver ........................................................... 18
XXIII.  Quiet Enjoyment ..................................................... 18
XXIV.   Relocation .......................................................... 18
XXV.    Holding Over ........................................................ 18
XXVI.   Subordination to Mortgages; Estoppel Certificate .................... 19
XXVII.  Attorneys' Fees ..................................................... 19
XXVIII. Notice .............................................................. 19
XXIX.   Excepted Rights ..................................................... 19
XXX.    Surrender of Premises ............................................... 20
XXXI.   Miscellaneous ....................................................... 20
XXXII.  Entire Agreement .................................................... 22
                                       i
                             OFFICE LEASE AGREEMENT
         THIS OFFICE LEASE  AGREEMENT  (the "Lease") is made and entered into as
of the 28th day of October 1999, by and between  EOP-SHORELINE  TECHNOLOGY PARK,
L.L.C.,  a  Delaware  limited  liability  company   ("Landlord")  and  COMMTOUCH
SOFTWARE, INC., a California corporation ("Tenant").
I.       Basic Lease Information.
         A.       "Building"  shall mean the building  located at ▇▇▇▇  ▇▇▇▇▇▇▇▇
                  ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
         B.       "Premises"  shall mean the area  shown on Exhibit  A-1 to this
                  Lease. The "Rentable Square Footage of the Premises" is deemed
                  to be 71,404 square feet.
         C.       "Rentable  Square  Footage  of the  Building"  is deemed to be
                  71,404  square feet.  Landlord and Tenant  stipulate  that the
                  Premises  include  all of the  floors in their  entirety,  all
                  corridors and restroom  facilities located in the Building and
                  accordingly,  all such full floors shall be considered part of
                  the Premises.  Landlord and Tenant further stipulate and agree
                  that the  Rentable  Square  Footage  of the  Building  and the
                  Rentable  Square Footage of the Premises are correct and shall
                  not be remeasured.
         D.       "Base Rent":
                                    Annual Rate
                                    Per Square      Annual           Monthly
                       Period          Foot        Base Rent        Base Rent
                  ----------------    ------     -------------     -----------
                  3/1/00 - 2/28/01    $34.20     $2,442,016.80     $203,501.40
                  3/1/01 - 2/28/02    $35.40     $2,527,701.60     $210,641.80
                  3/1/02 - 2/28/03    $36.60     $2,613,386.40     $217,782.20
                  3/1/03 - 2/29/04    $37.80     $2,699,071.20     $224,922.60
                  3/1/04 - 2/28/05    $39.00     $2,784,756.00     $232,063.00
                  3/1/05 - 2/28/06    $40.20     $2,870,440.80     $239,203.40
                  3/1/06 - 5/14/07    $41.40     $2,956,125.60     $246,343.80
                  Notwithstanding  the  above  schedule  of  Base  Rent  to  the
                  contrary, as long as Tenant is not in default, Tenant shall be
                  entitled  to (i) an  abatement  of Base Rent in the  amount of
                  $6,783.38  per  day  for  75  consecutive  days  of  the  Term
                  beginning with the Commencement Date (the "Abatement  Period")
                  for a total amount of $508,753.50  (the "Abated Base Rent") of
                  Base Rent  abated  during the  Abatement  Period;  and (ii) an
                  abatement  of 75  consecutive  days of Expenses  and Taxes (as
                  hereinafter defined) (the "Abated Expenses and Taxes") for the
                  Abatement  Period.  In the  event of a  monetary  or  material
                  non-monetary default by Tenant which occurs at any time during
                  the Term and  extends  beyond any  applicable  notice and cure
                  period  provided  herein,  all  Abated  Base  Rent and  Abated
                  Expenses and Taxes shall  immediately  become due and payable.
                  The  payment by Tenant of the Abated  Base Rent and the Abated
                  Expenses  and Taxes in the event of a default  shall not limit
                  or affect any of  Landlord's  other  rights,  pursuant to this
                  Lease or at law or in  equity.  During the  Abatement  Period,
                  only Base Rent and Expenses and Taxes shall be abated, and all
                  Additional Rent and other costs and charges  specified in this
                  Lease  shall  remain  as  due  and  payable  pursuant  to  the
                  provisions   of  this   Lease.   In  the  event  that   Tenant
                  substantially  completes  all of the Initial  Alterations  (as
                  defined in Exhibit D of this  Lease)  prior to the last day of
                  the Abatement  Period,  this paragraph shall expire and Tenant
                  shall commence  paying Base Rent in accordance  with the above
                  Base Rent schedule and Expenses and Taxes in  accordance  with
                  Article  IV of this  Lease  commencing  with the day after the
                  date  all  of  the  Initial   Alterations  are   substantially
                  completed.   For  purposes  of  this  paragraph,  the  Initial
                  Alterations  in the  Premises  shall be  deemed  substantially
                  completed on the date that, in Landlord's reasonable judgment,
                  all Initial  Alterations  have been performed,  other than any
                  details of  construction,  mechanical  adjustment or any other
                  similar matter, the noncompletion of which does not materially
                  interfere with Tenant's use of the Premises.
         E.       "Tenant's Pro Rata Share": 100%.
                                       1
         F.       "Term":  A period of 84  months  and 75 days.  The Term  shall
                  commence  on March 1,  2000  (the  "Commencement  Date")  and,
                  unless  terminated  early or extended in accordance  with this
                  Lease, end on May 14, 2007 (the "Termination Date").
         G.       Tenant  allowance(s):  $357,020.00 as more fully  described on
                  Exhibit D of this Lease.
         H.       "Security Deposit":  $1,100,000.00. The Security Deposit shall
                  be in the form of an irrevocable letter of credit (the "Letter
                  of  Credit"),  which  Letter  of Credit  shall:  (a) be in the
                  amount of  $1,100,000.00;  (b) be issued on the form  attached
                  hereto as Exhibit G; (c) name Landlord as its beneficiary; (d)
                  be drawn on an FDIC insured financial institution satisfactory
                  to Landlord;  (e) be delivered to Landlord  upon  execution of
                  this Lease,  and (f) expire no earlier  than 90 days after the
                  Termination Date of this Lease.
         I.       "Guarantor(s)":  As of the date of this  Lease,  there  are no
                  Guarantors.
         J.       "Broker(s)":   Cornish  &  ▇▇▇▇▇   Commercial   and   Colliers
                  International.
         K.       "Permitted   Use":    Office,    research   and   development,
                  manufacturing,  storage and other legal uses as  permitted  by
                  local zoning laws  applicable  to the  Premises and  otherwise
                  permitted by the Governing  Documents (as that term is defined
                  in Article XXXI.M. below).
         L.       "Notice Addresses.
                  Tenant:
                  On and after the Commencement  Date,  notices shall be sent to
                  Tenant  at  the  Premises.  Prior  to the  Commencement  Date,
                  notices shall be sent to Tenant at the following address:
                  ▇▇▇▇ ▇▇▇▇▇-CommTouch Software
                  ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇. ▇▇▇
                  ▇▇▇▇▇ ▇▇▇▇▇, ▇▇ ▇▇▇▇▇
                  Phone #: ▇▇▇-▇▇▇-▇▇▇▇
                  Fax #: ▇▇▇-▇▇▇-▇▇▇▇
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                  Landlord:                       With a copy  to:
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                  EOP-SHORELINE  TECHNOLOGY       Equity Office Properties Trust
                  PARK, L.L.C.                    Two North Riverside Plaza
                  c/o Equity Office Properties    Suite 2200
                  Trust                           ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇
                  4 Palo Alto Square              Attention: Regional Counsel -
                  3000 El Camino Real, Suite ▇▇▇  ▇▇▇▇▇▇▇ ▇▇▇▇▇▇
                  ▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇-▇▇▇▇
                  Attention: Building Manager
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                  Rent  (defined  in  Section  IV.A) is  payable to the order of
                  Equity  Office  Properties  at  the  following  address:   EOP
                  Operating  Limited  Partnership,  as agent  for  EOP-Shoreline
                  Technology   Park,  Dept.   #8824,  ▇▇▇  ▇▇▇▇▇▇▇,   ▇▇▇▇▇▇▇▇▇▇
                  ▇▇▇▇▇-▇▇▇▇.
         M.       "Business  Day(s)"  are  Monday  through  Friday of each week,
                  exclusive of New Year's Day,  Memorial Day,  Independence Day,
                  Labor Day,  Thanksgiving  Day and Christmas Day  ("Holidays").
                  Landlord may designate additional Holidays,  provided that the
                  additional  Holidays are commonly  recognized  by other office
                  buildings in the area where the Building is located.
         N.       "Landlord  Work"  means the work,  if any,  that  Landlord  is
                  obligated  to perform in the  Premises  pursuant to a separate
                  work letter agreement (the "Work Letter"), if any, attached as
                  Exhibit D. If a Work  Letter is not  attached to this Lease or
                  if an  attached  Work  Letter  does not  require  Landlord  to
                  perform any work,  the  occurrence  of the  Commencement  Date
                  shall  not be  conditioned  upon  the  performance  of work by
                  Landlord  and,  accordingly,   Section  lll.A.  shall  not  be
                  applicable to the determination of the Commencement Date.
                                       2
         0.       "Law(s)" means all  applicable  statutes,  codes,  ordinances,
                  orders, rules and regulations of any municipal or governmental
                  entity.
         P.       "Normal  Business Hours" for the Building are 8 A.M. to 5 P.M.
                  on Business Days.
         Q.       "Property"  means the  Building  and the  parcel(s) of land on
                  which  it  is  located  and,  at  Landlord's  discretion,  the
                  Building's  parking  area and other  improvements  serving the
                  Building,  if any, and the parcel(s) of land on which they are
                  located.
         R.       "Project" shall mean the development  located on approximately
                  51.83 acres commonly  described as Shoreline  Technology Park,
                  which  includes the Building,  the Property,  as well as other
                  buildings  and  property as  outlined on Exhibit A-2  attached
                  hereto and incorporated herein.
         S.       "Rentable  Square  Footage  of the  Project"  is  deemed to be
                  726,508 square feet.
II.      Lease Grant.
         Landlord  leases the Premises to Tenant and Tenant  leases the Premises
from Landlord, together with the right in common with others to use any portions
of the Project that are designated by Landlord for the common use of tenants and
others, such as sidewalks,  unreserved parking areas, common corridors, elevator
foyers, restrooms, vending areas, lobby areas, artificial lakes, walkways, water
amenities,   landscaping,   plaza,  roads,   driveways,   and  recreation  areas
(collectively,  the "Common  Areas"),  including but not limited to that certain
recreation area (the "Recreational Area") which is maintained by Landlord in the
location and configuration shown on Exhibit A-3 attached hereto. Notwithstanding
the foregoing to the contrary, Tenant's right to use the Recreational Area shall
be subject to the right of the City of Mountain  View ("City") to require that a
portion of the  Recreational  Area be paved and used for  parking  purposes at a
time to be  determined at the  discretion  of the City.  The area to be used for
parking purposes is indicated as "Potential Parking Area" on Exhibit A-3. If the
City requires the parking,  Tenant shall have the non-exclusive right to use the
parking spaces created thereby.
III.     Possession.
         A.       Intentionally Omitted.
         B.       Subject to Landlord's obligation,  if any, to perform Landlord
                  Work and  Landlord's  obligations  under  Section  IX.B.,  the
                  Premises  are  accepted  by  Tenant in "as is"  condition  and
                  configuration.  By taking  possession of the Premises,  Tenant
                  agrees that the  Premises  are in good order and  satisfactory
                  condition, and that there are no representations or warranties
                  by Landlord  regarding  the  condition  of the Premises or the
                  Building.  If Landlord is delayed delivering possession of the
                  Premises  or any other  space due to the  holdover or unlawful
                  possession  of such  space by any  party,  Landlord  shall use
                  reasonable  efforts to obtain possession of the space. In such
                  event, the Commencement Date shall be postponed until the date
                  Landlord  delivers  possession  of the Premises to Tenant free
                  from occupancy by any party, and the Termination  Date, at the
                  option of  Landlord,  may be  postponed  by an equal number of
                  days.  In the event  the  Commencement  Date is so  postponed,
                  Landlord  and Tenant  shall enter into a  commencement  letter
                  agreement in the form  attached as Exhibit C.  Notwithstanding
                  the foregoing,  if there have been no delays caused by Tenant,
                  and Landlord has not  tendered  possession  of the Premises to
                  Tenant  by July  1,  2000  (the  "Outside  Possession  Date"),
                  Tenant, as its sole remedy, may terminate this Lease by giving
                  Landlord  written  notice  of  termination  on or  before  the
                  earlier  to occur of: (i) 5  Business  Days after the  Outside
                  Possession  Date;  and (ii)  the  Commencement  Date.  In such
                  event,  this  Lease  shall be  deemed  null and void and of no
                  further force and effect and Landlord  shall  promptly  refund
                  any Prepaid Rental and Security Deposit previously advanced by
                  Tenant  under  this  Lease  and,  so  long as  Tenant  has not
                  previously  defaulted under any of its  obligations  under the
                  Work  Letter,   the  parties  hereto  shall  have  no  further
                  responsibilities  or obligations to each other with respect to
                  this Lease.  Landlord and Tenant  acknowledge  and agree that:
                  (i) the determination of the Commencement Date shall take into
                  consideration the effect of any delays by
                                       3
                  Tenant;   and  (ii)  the  Outside  Possession  Date  shall  be
                  postponed  by the  number  of days  the  Commencement  Date is
                  delayed  due  to  events  of  Force  Majeure.  Notwithstanding
                  anything herein to the contrary,  if Landlord  determines that
                  it will be unable  to tender  possession  of the  Premises  to
                  Tenant,  Landlord  shall have the right to provide Tenant with
                  written  notice  (the  "Outside  Extension  Notice")  of  such
                  inability,  which Outside Extension Notice shall set forth the
                  date  on  which   Landlord   reasonably   believes   that  the
                  Commencement  Date will  occur.  Upon  receipt of the  Outside
                  Extension  Notice,  Tenant  shall have the right to  terminate
                  this  Lease by  providing  written  notice of  termination  to
                  Landlord  within 5 Business Days after the date of the Outside
                  Extension  Notice. In the event that Tenant does not terminate
                  this Lease  within  such 5 Business  Day  period,  the Outside
                  Possession Date shall  automatically be amended to be the date
                  set forth in Landlord's Outside Extension Notice.
         C.       If  Tenant  takes   possession  of  the  Premises  before  the
                  Commencement  Date,  such  possession  shall be subject to the
                  terms and  conditions  of this Lease and Tenant shall pay Rent
                  (defined  in  Section  IV.A.)  to  Landlord  for  each  day of
                  possession before the Commencement Date.  However,  except for
                  the  cost  of  services  requested  by  Tenant  (e.g.  freight
                  elevator usage),  Tenant shall not be required to pay Rent for
                  any days of  possession  before the  Commencement  Date during
                  which Tenant, with the approval of Landlord,  is in possession
                  of  the   Premises   for  the  sole   purpose  of   performing
                  improvements  or  installing  furniture,  equipment  or  other
                  personal property.
IV.      Rent.
         A.       Payments.  As consideration  for this Lease,  Tenant shall pay
                  Landlord, without any setoff or deduction, the total amount of
                  Base Rent and  Additional  Rent due for the Term.  "Additional
                  Rent" means all sums  (exclusive  of Base Rent) that Tenant is
                  required to pay  Landlord.  Additional  Rent and Base Rent are
                  sometimes collectively referred to as "Rent". Tenant shall pay
                  and be  liable  for  all  rental,  sales  and use  taxes  (but
                  excluding  income taxes),  if any, imposed upon or measured by
                  Rent under  applicable  Law. Base Rent and  recurring  monthly
                  charges of Additional Rent shall be due and payable in advance
                  on the  first day of each  calendar  month  without  notice or
                  demand, provided that the installment of Base Rent for the 4th
                  full  calendar  month of the Term  shall be  payable  upon the
                  execution  of this  Lease by Tenant.  All other  items of Rent
                  shall be due and  payable by Tenant on or before 30 days after
                  billing by Landlord. All payments of Rent shall be by good and
                  sufficient check or by other means (such as automatic debit or
                  electronic transfer)  acceptable to Landlord.  If Tenant fails
                  to pay any item or installment of Rent when due,  Tenant shall
                  pay Landlord an administration fee equal to 5% of the past due
                  Rent, provided that Tenant shall be entitled to a grace period
                  of 5 days after  receipt of written  notice from  Landlord for
                  the first 2 late payments of Rent in a given calendar year. If
                  the Term  commences  on a day  other  than the  first day of a
                  calendar  month or terminates on a day other than the last day
                  of a calendar  month,  the monthly  Base Rent and Tenant's Pro
                  Rata Share of Expenses  (defined  in Section  IV.C.) and Taxes
                  (defined  in Section  IV.D.) for the month  shall be  prorated
                  based on the number of days in such calendar month. Landlord's
                  acceptance  of less than the  correct  amount of Rent shall be
                  considered a payment on account of the  earliest  Rent due. No
                  endorsement  or statement on a check or letter  accompanying a
                  check  or   payment   shall  be   considered   an  accord  and
                  satisfaction, and either party may accept the check or payment
                  without prejudice to that party's right to recover the balance
                  or pursue other available  remedies.  Tenant's covenant to pay
                  Rent is independent of every other covenant in this Lease.
         B.       Payment  of  Tenant's  Pro Rata Share of  Expenses  and Taxes.
                  Tenant  shall pay  Tenant's Pro Rata Share of the total amount
                  of Expenses  (defined in Section  IV.C.) and Taxes (defined in
                  Section IV.D) for each calendar year during the Term. Landlord
                  shall provide  Tenant with a good faith  estimate of the total
                  amount of Expenses and Taxes for each calendar year during the
                  Term.  On or before the first day of each month,  Tenant shall
                  pay to Landlord a monthly  installment equal to one-twelfth of
                  Tenant's  Pro Rata Share of  Landlord's  estimate of the total
                  amount of Expenses and Taxes. If Landlord  determines that its
                  good  faith  estimate  was  incorrect  by a  material  amount,
                  Landlord may provide Tenant with a revised estimate. After its
                  receipt of the revised estimate, Tenant's
                                       4
                  monthly payments shall be based upon the revised estimate.  If
                  Landlord does not provide Tenant with an estimate of the total
                  amount of Expenses and Taxes by January 1 of a calendar  year,
                  Tenant shall continue to pay monthly installments based on the
                  previous year's  estimate until Landlord  provides Tenant with
                  the  new  estimate.  Upon  delivery  of the new  estimate,  an
                  adjustment  shall be made for any month for which  Tenant paid
                  monthly  installments  based on the previous year's  estimate.
                  Tenant  shall pay  Landlord  the  amount  of any  underpayment
                  within  30  days  after  receipt  of  the  new  estimate.  Any
                  overpayment  shall be  refunded  to  Tenant  within 30 days or
                  credited  against  the  next  due  future   installment(s)  of
                  Additional Rent.
                  As soon as is  practical  following  the end of each  calendar
                  year,  Landlord  shall furnish  Tenant with a statement of the
                  actual  amount of  Expenses  and Taxes for the prior  calendar
                  year and  Tenant's  Pro Rata  Share of the  actual  amount  of
                  Expenses  and  Taxes  for  the  prior  calendar  year.  If the
                  estimated  amount of Expenses and Taxes for the prior calendar
                  year is more than the actual  amount of Expenses and Taxes for
                  the prior calendar year,  Landlord shall apply any overpayment
                  by Tenant  against  Additional  Rent due or next becoming due,
                  provided if the Term expires before the  determination  of the
                  overpayment,  Landlord shall refund any  overpayment to Tenant
                  after first  deducting  any Rent still due.  If the  estimated
                  amount of Expenses  and Taxes for the prior  calendar  year is
                  less than the  actual  amount of  Expenses  and Taxes for such
                  prior year,  Tenant shall pay  Landlord,  within 30 days after
                  its  receipt of the  statement  of  Expenses  and  Taxes,  any
                  underpayment for the prior calendar year.
         C.       Expenses Defined.  "Expenses" means the sum of (y) 100% of all
                  direct  and  indirect  costs  and  expenses  incurred  in each
                  calendar  year  in  connection  with  operating,  maintaining,
                  repairing, managing and owning the Premises, the Building, the
                  Property,  and the  parking  structure(s)  or  parking  lot(s)
                  predominantly  serving the  Building,  and (z) the  Building's
                  allocable  share of the direct and indirect costs of operating
                  and  maintaining   the  Common  Areas  of  the  Project,   the
                  Building's  applicable share of all costs,  fees,  expenses or
                  other amounts payable by Landlord to the Association,  if any,
                  and the Building's applicable share of all fees payable to the
                  company  or  the  Association,  if  applicable,  managing  the
                  parking   areas   within  the  Project,   including,   without
                  limitation, the following:
                  1.       Labor  costs,  including,   wages,  salaries,  social
                           security  and  employment  taxes,  medical  and other
                           types   of   insurance,   uniforms,   training,   and
                           retirement  and pension  plans,  provided  that if an
                           employee  performs  services in  connection  with the
                           Project and other  projects,  costs  associated  with
                           such  employee  may be  proportionately  included  in
                           Expenses   based  on  the  percentage  of  time  such
                           employee  spends in  connection  with the  operation,
                           maintenance and management of the Project.
                  2.       Management fees, including,  without limitation,  the
                           cost  of  equipping  and   maintaining  a  management
                           office,  accounting and bookkeeping  services,  legal
                           fees  not   attributable  to  leasing  or  collection
                           activity,  and other administrative costs.  Landlord,
                           by itself or  through  an  affiliate,  shall have the
                           right to  directly  perform or provide  any  services
                           under this  Lease  (including  management  services),
                           provided that the cost of any such services shall not
                           exceed  the cost that would  have been  incurred  had
                           Landlord  entered  into an  arms-length  contract for
                           such   services  with  an   unaffiliated   entity  of
                           comparable skill and experience.
                  3.       The reasonable  cost of services,  including  amounts
                           paid to service providers and the rental and purchase
                           cost of parts, supplies, tools and equipment.
                  4.       Premiums  and   deductibles   paid  by  Landlord  for
                           insurance,  including workers compensation,  fire and
                           extended  coverage,  earthquake,  general  liability,
                           rental  loss,  elevator,  boiler and other  insurance
                           customarily  carried  from  time to time by owners of
                           comparable office buildings.
                  5.       Electrical  Costs  (defined  below) and  charges  for
                           water,  gas,  steam and sewer,  but  excluding  those
                           charges for which Landlord is reimbursed by
                                       5
                           tenants.  "Electrical  Costs" means: (a) charges paid
                           by Landlord for  electricity;  (b) costs  incurred in
                           connection with an energy management  program for the
                           Property and/or Project; and (c) if and to the extent
                           permitted by Law, a fee for the services  provided by
                           Landlord in connection  with the selection of utility
                           companies and the negotiation and  administration  of
                           contracts  for  electricity,  provided  that such fee
                           shall  not  exceed  50% of any  savings  obtained  by
                           Landlord.
                  6.       The  amortized  cost  of  capital   improvements  (as
                           distinguished  from  replacement  parts or components
                           installed in the ordinary course of business) made to
                           the Project  which are:  (a)  performed  primarily to
                           reduce operating  expense costs or otherwise  improve
                           the  operating  efficiency  of  the  Project;  or (b)
                           required to comply with any Laws that are enacted, or
                           first interpreted to apply to the Project,  after the
                           date of this Lease;  or (c) made necessary due to (i)
                           the negligent  act or omission or willful  misconduct
                           of Tenant or the Tenant  Related  Parties (as defined
                           below)  or  (ii)  the  Initial   Alterations  or  any
                           subsequent Alterations to the Premises made by or for
                           the   benefit   of   Tenant.   The  cost  of  capital
                           improvements  shall be amortized by Landlord over the
                           lesser of the Payback  Period  (defined  below) or 10
                           years.  The  amortized  cost of capital  improvements
                           may, at Landlord's option,  include actual or imputed
                           interest at the rate that Landlord  would  reasonably
                           be required to pay to finance the cost of the capital
                           improvement.  "Payback  Period" means the  reasonably
                           estimated  period  of time that it takes for the cost
                           savings resulting from a capital improvement to equal
                           the total cost of the capital improvement.
                  If Landlord incurs Expenses for the Project  together with one
                  or more other buildings or properties,  whether  pursuant to a
                  reciprocal  easement  agreement,   common  area  agreement  or
                  otherwise,  the shared costs and  expenses  shall be equitably
                  prorated  and  apportioned  between  the Project and the other
                  buildings or properties.  Expenses shall not include: the cost
                  of capital improvements,  including repairs or replacements to
                  the structural  elements of the Building  (except as set forth
                  above);  depreciation;  interest (except as provided above for
                  the amortization of capital improvements);  principal payments
                  of mortgage and other  non-operating  debts of  Landlord;  the
                  cost of  repairs  or  other  work to the  extent  Landlord  is
                  reimbursed  by insurance or  condemnation  proceeds;  costs in
                  connection  with  leasing  space  in  the  Building  or  other
                  buildings in the  Project,  including  brokerage  commissions;
                  lease    concessions,    including   rental   abatements   and
                  construction  allowances,  granted to specific tenants;  costs
                  incurred in connection with the sale, financing or refinancing
                  of the  Building or other  buildings  in the  Project;  fines,
                  interest  and  penalties  incurred  due to the late payment of
                  Taxes  (defined in Section  IV.D) or Expenses;  organizational
                  expenses  associated  with the creation  and  operation of the
                  entity which constitutes Landlord; or any penalties or damages
                  that  Landlord  pays to Tenant  under  this  Lease or to other
                  tenants in the  Building or other  buildings  in the  Project,
                  under their respective  leases. If the Project is not at least
                  95% occupied  during any  calendar  year or if Landlord is not
                  supplying  services  to at  least  95% of the  total  Rentable
                  Square  Footage of the  Project at any time  during a calendar
                  year,  Expenses shall, at Landlord's  option, be determined as
                  if the Project had been 95%  occupied  and  Landlord  had been
                  supplying  services to 95% of the Rentable  Square  Footage of
                  the Project during that calendar year.  The  extrapolation  of
                  Expenses   under   this   Section   shall  be   performed   by
                  appropriately  adjusting  the  cost  of  those  components  of
                  Expenses  that are impacted by changes in the occupancy of the
                  Project.
         D.       Taxes  Defined.  "Taxes" shall mean: (1) all real estate taxes
                  and  other  assessments  on  the  Building,   Property  and/or
                  Project,  including,  but  not  limited  to,  assessments  for
                  special   improvement   districts  and  building   improvement
                  districts,  taxes and  assessments  levied in  substitution or
                  supplementation  in  whole or in part of any  such  taxes  and
                  assessments  and the Project's  share of any real estate taxes
                  and  assessments  under  any  reciprocal  easement  agreement,
                  common area agreement or similar  agreement as to the Project;
                  (2) all personal  property taxes for property that is owned by
                  Landlord   and  used  in   connection   with  the   operation,
                  maintenance  and repair of the Project;  and (3) all costs and
                  fees incurred in connection with seeking reductions in any tax
                  liabilities  described  in (1)  and  (2),  including,  without
                  limitation, any costs incurred by
                                       6
                  Landlord for compliance, review and appeal of tax liabilities.
                  Without  limitation,  Taxes  shall  not  include  any  income,
                  capital  levy,  franchise,  capital  stock,  gift,  estate  or
                  inheritance  tax. If an assessment is payable in installments,
                  Taxes for the year shall include the amount of the installment
                  and any  interest  due and payable  during that year.  For all
                  other  real  estate  taxes,  Taxes  for that  year  shall,  at
                  Landlord's  election,   include  either  the  amount  accrued,
                  assessed or  otherwise  imposed for the year or the amount due
                  and payable for that year,  provided that Landlord's  election
                  shall be applied consistently throughout the Term. If a change
                  in Taxes is obtained for any year of the Term,  then Taxes for
                  that year will be  retroactively  adjusted and Landlord  shall
                  provide Tenant with a credit, if any, based on the adjustment.
                  Tenant  shall be  responsible  for,  and  shall  pay  prior to
                  delinquency,  taxes or governmental  service fees,  possessory
                  interest  taxes,  fees or charges  in lieu of any such  taxes,
                  capital  levies,  or other charges  imposed upon,  levied with
                  respect to, or assessed against,  its personal  property,  and
                  its  interest  pursuant to this Lease.  To the extent that any
                  such taxes are not  separately  assessed  or billed to Tenant,
                  Tenant  shall pay the amount  thereof as invoiced to Tenant by
                  Landlord prior to the  delinquency of such taxes. In the event
                  that the tenant  improvements in the Building which correspond
                  to the  Initial  Alterations,  as defined in this  Lease,  are
                  assessed  and  taxed  separately  by  the  applicable   taxing
                  authority,  then  Tenant  shall be  liable  and shall pay that
                  portion of the Taxes  applicable  to the value of the  Initial
                  Alterations  in the  Premises  based on the  value  attributed
                  thereto by the applicable  taxing  authority to either (a) the
                  applicable  taxing  authority prior to the delinquency of such
                  taxes in the  event  Tenant  billed  directly  by such  taxing
                  authority,  or (b) the Landlord  within 30 days after  written
                  demand,  in the  event  Landlord  is  billed  directly  by the
                  applicable taxing authority.
         E.       Audit  Rights.  Tenant  may,  within 90 days  after  receiving
                  Landlord's statement of Expenses, give Landlord written notice
                  ("Review  Notice")  that Tenant  intends to review  Landlord's
                  records  of the  Expenses  for that  calendar  year.  Within a
                  reasonable  time after receipt of the Review Notice,  Landlord
                  shall make all pertinent records available for inspection that
                  are reasonably  necessary for Tenant to conduct its review. If
                  any records are maintained at a location other than the office
                  of the Project,  Tenant may either inspect the records at such
                  other location or pay for the  reasonable  cost of copying and
                  shipping  the  records.  If Tenant  retains an agent to review
                  Landlord's  records,  the agent  must be with a  licensed  CPA
                  firm.  Tenant  shall  be  solely  responsible  for all  costs,
                  expenses and fees incurred for the audit. Within 60 days after
                  the records are made  available  to Tenant,  Tenant shall have
                  the  right to give  Landlord  written  notice  (an  "Objection
                  Notice")  stating  in  reasonable   detail  any  objection  to
                  Landlord's  statement  of  Expenses  for that year.  If Tenant
                  fails to give  Landlord an Objection  Notice within the 60 day
                  period  or  fails to  provide  Landlord  with a Review  Notice
                  within  the 90 day period  described  above,  Tenant  shall be
                  deemed to have approved  Landlord's  statement of Expenses and
                  shall be barred from raising any claims regarding the Expenses
                  for that  year.  If  Tenant  provides  Landlord  with a timely
                  Objection  Notice,  Landlord and Tenant shall work together in
                  good faith to resolve any issues raised in Tenant's  Objection
                  Notice. If Landlord and Tenant determine that Expenses for the
                  calendar year are less than  reported,  Landlord shall provide
                  Tenant with a credit  against the next  installment of Rent in
                  the amount of the overpayment by Tenant. Likewise, if Landlord
                  and Tenant  determine  that Expenses for the calendar year are
                  greater than reported, Tenant shall pay Landlord the amount of
                  any underpayment within 30 days. In addition,  if Landlord and
                  Tenant  determine  that Expenses for the Building for the year
                  in question  were less than stated by more than 5%,  Landlord,
                  within 30 days  after its  receipt of paid  invoices  therefor
                  from Tenant, shall reimburse Tenant for any reasonable amounts
                  paid by Tenant to third parties in connection with such review
                  by Tenant.  The records obtained by Tenant shall be treated as
                  confidential. In no event shall Tenant be permitted to examine
                  Landlord's  records or to dispute  any  statement  of Expenses
                  unless Tenant has paid and continues to pay all Rent when due.
                                       7
V.       Compliance with Laws; Use.
         The Premises  shall be used only for the Permitted Use and for no other
use  whatsoever.  Tenant shall not use or permit the use of the Premises for any
purpose  which is  illegal,  dangerous  to  persons  or  property  or which,  in
Landlord's  reasonable opinion,  unreasonably  disturbs any other tenants of the
Building or the Project or interferes  with the operation of the Building or the
Project.  Tenant  shall  comply  with all Laws,  including  the  Americans  with
Disabilities  Act,  regarding  the  operation of Tenant's  business and the use,
condition,  configuration and occupancy of the Premises.  Tenant, within 10 days
after  receipt,  shall  provide  Landlord with copies of any notices it receives
regarding a violation or alleged violation of any Laws. Tenant shall comply with
the rules and  regulations  of the Project  attached as Exhibit B and such other
reasonable rules and regulations  adopted by Landlord from time to time.  Tenant
shall also cause its agents, contractors, subcontractors,  employees, customers,
and  subtenants  to comply with all rules and  regulations.  Landlord  shall not
knowingly discriminate against Tenant in Landlord's enforcement of the rules and
regulations.
VI.      Security Deposit.
         A.       The Security  Deposit  shall be delivered to Landlord upon the
                  execution  of  this  Lease  by  Tenant  and  shall  be held by
                  Landlord  without  liability for interest  (unless required by
                  Law) as security for the performance of Tenant's  obligations.
                  The  Security  Deposit is not an advance  payment of Rent or a
                  measure of Tenant's liability for damages.  Landlord may, from
                  time to time,  without prejudice to any other remedy,  use all
                  or a portion of the Security  Deposit to satisfy past due Rent
                  or to cure any uncured default by Tenant. If Landlord uses the
                  Security Deposit,  Tenant shall on demand restore the Security
                  Deposit to its  original  amount.  Landlord  shall  return any
                  unapplied  portion of the Security Deposit to Tenant within 45
                  days  after the later to occur of:  (1) the  determination  of
                  Tenant's  Pro Rata Share of  Expenses  and Taxes for the final
                  year of the Term; (2) the date Tenant surrenders possession of
                  the Premises to Landlord in accordance with this Lease; or (3)
                  the  Termination  Date. If Landlord  transfers its interest in
                  the Premises,  Landlord may assign the Security Deposit to the
                  transferee and, following the assignment,  Landlord shall have
                  no further  liability for the return of the Security  Deposit.
                  Landlord  shall not be required to keep the  Security  Deposit
                  separate from its other accounts.  The Security Deposit may be
                  in the form of an irrevocable letter of credit (the "Letter of
                  Credit"),  which Letter of Credit shall:  (a) be in the amount
                  of $1,100,000.00; (b) be issued on the form attached hereto as
                  Exhibit G; (c) name Landlord as its beneficiary;  (d) be drawn
                  on an  FDIC  insured  financial  institution  satisfactory  to
                  Landlord;  (e) be delivered to Landlord upon execution of this
                  Lease;  and (f)  expire  no  earlier  than 90 days  after  the
                  Termination Date of this Lease.
         B.       Notwithstanding  anything  herein  to the  contrary,  provided
                  Tenant  is (1) not in  default  under  this  Lease  after  the
                  expiration of any applicable notice and cure periods,  and (2)
                  occupying  at least 75% of the  Premises  as of the  effective
                  date of any  reduction of the Security  Deposit,  Tenant shall
                  have the right to reduce  the amount of the  Security  Deposit
                  (i.e., the Letter of Credit) to be as follows: (i) $975,000.00
                  effective as of the 13th full calendar month of the Term; (ii)
                  $850,000.00  effective as of the 25th full  calendar  month of
                  the  Term;  (iii)  $725,000.00  effective  as of the 37th full
                  calendar month of the Term; (iv)  $600,000.00  effective as of
                  the 49th full calendar month of the Term; and (v)  $492,687.60
                  effective as of the 61st full calendar month of the Term. Such
                  reduction  shall be  accomplished  by  having  Tenant  provide
                  Landlord  with a  substitute  Letter of Credit in the  reduced
                  amount.
VII.     Services to be Furnished by Landlord.
         A.       Tenant  will be  responsible,  at its sole cost and expense to
                  the extent provided in Article X below,  for the furnishing of
                  all services and utilities to the Premises, including, but not
                  limited  to,  heating,   ventilation   and   air-conditioning,
                  electricity,   water,  light,  power,  trash  pick-up,   sewer
                  charges, telephone,  janitorial and interior Building security
                  services  and  all  other  utility  services  supplied  to the
                  Premises,  and all  taxes  and  surcharges  thereon.  Landlord
                  agrees to maintain  and repair the  Property as  described  in
                  Article IX.B.
         B.       Any  interruption  or  termination  of,  services  due  to the
                  application  of  Laws,  the  failure  of  any  equipment,  the
                  performance of repairs, improvements or
                                       8
                  alterations,  or the  occurrence of any other event not caused
                  by the  negligent  act or willful  misconduct  of  Landlord (a
                  "Service Failure") shall not render Landlord liable to Tenant,
                  constitute a constructive  eviction of Tenant, give rise to an
                  abatement of Rent,  nor relieve  Tenant from the obligation to
                  fulfill any covenant or  agreement.  Furthermore,  in no event
                  shall  Landlord  be liable to Tenant  for any loss or  damage,
                  including the theft of Tenant's  Property  (defined in Article
                  XV),  arising out of or in connection  with the failure of any
                  security services, personnel or equipment.
VIII.    Leasehold Improvements.
         All   improvements   to   the   Premises   (collectively,    "Leasehold
Improvements")  shall be owned by Landlord  and shall  remain upon the  Premises
without compensation to Tenant.  However,  Landlord, by written notice to Tenant
within 30 days prior to the Termination  Date, may require Tenant to remove,  at
Tenant's  expense:  (1) Cable (defined in Section IX.A)  installed by or for the
exclusive benefit of Tenant and located in the Premises or other portions of the
Project; and (2) any Leasehold Improvements (other than the Initial Alterations)
that are  performed  by or for the  benefit  of Tenant  after the date  Landlord
tenders  possession  of the  Premises to Tenant and,  in  Landlord's  reasonable
judgment,  are of a nature that would require  removal and repair costs that are
materially  in excess of the removal and repair costs  associated  with standard
office improvements (collectively referred to as "Required Removables"). Without
limitation,  it is agreed that Required  Removables include internal  stairways,
raised  floors,  personal  baths and showers,  vaults,  rolling file systems and
structural  alterations and  modifications of any type. The Required  Removables
designated by Landlord shall be removed by Tenant before the  Termination  Date,
provided  that upon prior written  notice to Landlord,  Tenant may remain in the
Premises  for up to 5 days after the  Termination  Date for the sole  purpose of
removing the Required  Removables.  Tenant's possession of the Premises shall be
subject  to all of the  terms  and  conditions  of  this  Lease,  including  the
obligation  to pay Rent on a per diem  basis at the rate in effect  for the last
month of the Term.  Tenant shall repair  damage  caused by the  installation  or
removal  of  Required  Removables.  If  Tenant  fails  to  remove  any  Required
Removables or perform related repairs in a timely manner,  Landlord, at Tenant's
expense,  may remove and  dispose of the  Required  Removables  and  perform the
required  repairs.  Tenant,  within 30 days after  receipt of an invoice,  shall
reimburse   Landlord   for  the   reasonable   costs   incurred   by   Landlord.
Notwithstanding  the foregoing,  Tenant,  at the time it requests approval for a
proposed  Alteration  (defined in Section  IX.C),  may  request in writing  that
Landlcrd  advise Tenant  whether the Alteration or any portion of the Alteration
will be  designated  as a Required  Removable.  Within 10 days after  receipt of
Tenant's  request,  Landlord shall advise Tenant in writing as to which portions
of the Alteration, if any, will be considered to be Required Removables.
IX.      Repairs, Maintenance and Alterations.
         A.       Tenant's Repair and Maintenance Obligations.  Tenant shall, at
                  its sole cost and expense,  promptly  perform all  maintenance
                  and repairs to the Premises  that are not  Landlord's  express
                  responsibility  under this Lease,  and shall keep the Premises
                  (interior   and   exterior)  in  good   condition  and  repair
                  (including the replacement of any applicable  improvements and
                  appurtenances  when  necessary),   reasonable  wear  and  tear
                  excepted. Tenant's repair and replacement obligations include,
                  without limitation,  repairs to and replacements of: (1) floor
                  covering;  (2) interior  partitions;  (3) doors; (4) walls and
                  wall  coverings;  (5)  electronic,  phone and data cabling and
                  related equipment (collectively, "Cable") that is installed by
                  or for the  exclusive  benefit  of Tenant  and  located in the
                  Premises or other portions of the Project; (6) private showers
                  and  kitchens,   including  hot  water  heaters,  and  similar
                  facilities;  (7) mechanical (including HVAC), plumbing,  sewer
                  connections,  wiring,  electrical,  lighting,  and fire,  life
                  safety  equipment  and systems  serving the  Building  and the
                  Premises;  (8) windows,  glass and plate glass;  (9) ceilings;
                  (10) roof  membrane(s);  (11)  skylights;  (12)  fixtures  and
                  equipment;  and  (13)  Alterations  performed  by  contractors
                  retained by Tenant, including related HVAC balancing. All work
                  shall be performed in accordance with the rules and procedures
                  described in Section IX.C.  below. In addition,  Tenant shall,
                  at its sole cost and expense,  provide  janitorial  service to
                  the Premises in a manner  consistent with  first-class  office
                  buildings  in  the  Mountain   View,   California   area.  The
                  janitorial service to be provided by Tenant shall include, but
                  not be  limited  to,  the  obligation  to clean  the  exterior
                  windows and to keep the interior of the  Premises  such as the
                  windows,  floors,  walls, doors,  showcases and fixtures clean
                  and neat in  appearance  and to remove  all  trash and  debris
                  which may be found in or around the Premises.
                                       9
                  Tenant  shall also enter into and keep and maintain in effect,
                  service  contracts  reasonably  acceptable  to  Landlord  with
                  contractors   reasonably   acceptable   to  Landlord  for  the
                  maintenance and repair of those systems servicing the Building
                  as  Landlord  may  reasonably  designate,  including,  without
                  limitation,  the HVAC, electrical,  and life safety systems of
                  the Building. Without limiting the foregoing, Tenant shall, at
                  Tenant's sole cost and expense,  (a)  immediately  replace all
                  broken glass in the Premises  with glass equal to or in excess
                  of the  specification  and quality of the original glass;  and
                  (b)  repair  any damage  caused by  Tenant,  Tenant's  agents,
                  employees,  invitees, visitors,  subtenants or contractors. If
                  Tenant  fails to make any repairs to the  Premises or fails to
                  perform the  required  janitorial  work in the Premises at the
                  level  required  for  more  than 15  days  after  notice  from
                  Landlord (although notice shall not be required if there is an
                  emergency),  Landlord  may make the  repairs  or  perform  the
                  janitorial  work, as the case may be, and Tenant shall pay the
                  reasonable cost of the repairs or janitorial work, as the case
                  may be,  to  Landlord  within  30  days  after  receipt  of an
                  invoice,  together with an administrative  charge in an amount
                  equal to 5% of the cost of the work  performed.  Tenant  shall
                  maintain  written  records  of  maintenance  and  repairs,  as
                  required  by Law,  and  shall  use  certified  technicians  to
                  perform any such maintenance and repairs, as so required.
                  Notwithstanding  the foregoing to the  contrary,  in the event
                  either   Landlord  or  Tenant   believe   that  the   Tenant's
                  obligations  pursuant to the terms of this Article IX.A. would
                  require  Tenant to make major  replacements  of certain  items
                  which are more properly in the nature of a capital improvement
                  (as  distinguished  from  replacement  of parts or  components
                  installed  in the  ordinary  course of  business)  (a "Capital
                  Improvement  Expense"),  the party  making such  determination
                  shall  promptly  notify the other party  hereto of the need to
                  make such Capital  Improvement  Expense.  Upon receipt of such
                  notification,   the  parties   shall  enter  into  good  faith
                  negotiations to determine  whether the appropriate  work to be
                  performed is more in the nature of a repair or  replacement of
                  parts or a capital  improvement.  In the event the parties are
                  unable to agree within 30 days after the  commencement of such
                  discussions,  the parties shall seek the  determination of the
                  applicable  Landlord-approved  third party service  contractor
                  for  the   applicable   building   system  at   issue,   which
                  determination  shall be binding upon  Landlord and Tenant.  In
                  the event the parties  determine  that the required work to be
                  performed is not in the nature of a capital  improvement,  the
                  Tenant  shall make such  repairs or  replacements  at Tenant's
                  sole  cost  as  provided  above.  In  the  event  the  parties
                  determine  that the  required  work to be  performed is in the
                  nature of a capital  improvement,  Landlord shall perform such
                  Capital  Improvement  Expense  in  a  timely  and  workmanlike
                  manner.  Provided that such Capital Improvement Expense is not
                  made necessary due to (i) the negligent act or omission or the
                  willful  misconduct  of  Tenant or any of the  Tenant  Related
                  Parties,  or (ii) the construction of the Initial  Alterations
                  or any  subsequent  Alterations to the Premises made by or for
                  the benefit of Tenant  (collectively,  a "Tenant Fault"),  the
                  cost of such Capital  Improvement Expense shall be apportioned
                  between Landlord and Tenant such that Tenant shall pay, within
                  30 days after written demand thereof from Landlord,  an amount
                  equal to the  product  of (x) the  total  cost of the  Capital
                  Improvement Expense divided by the lesser of (a) the number of
                  years  of the  useful  life of such  capital  improvement  (as
                  reasonably  determined  by  Landlord)  and (b) 10  years,  and
                  multiplied  by (y) the number of years  remaining in the Lease
                  Term subsequent to the date the capital improvement work first
                  commences  (the  "Remaining  Years");  provided,  that  if the
                  number of Remaining Years is greater than the lesser of (a) or
                  (b)  above,  then  for  purposes  of  the  calculation  of the
                  Tenant's  share  of  the  Capital  Improvement   Expense,  the
                  Remaining Years shall equal the lesser of (a) or (b) above. In
                  the event the Capital  Improvement  Expense is made  necessary
                  due to a Tenant Fault, Tenant shall pay to Landlord, within 30
                  days after written  demand  thereof from  Landlord,  the total
                  amount of such Capital Improvement Expense.
         B.       Landlord's  Repair   Obligations.   Landlord  shall  keep  and
                  maintain in good repair and working  order and make repairs to
                  and perform  maintenance upon: (1) structural  elements of the
                  Building;  (2)  Common  Areas;  (3) the  roof of the  Building
                  (other than the roof  membrane);  and (4)  elevators  (if any)
                  serving the  Building.  Landlord  shall  promptly make repairs
                  (considering  the nature and  urgency of the repair) for which
                  Landlord is responsible.
                                       10
         C.       Alterations.  Tenant shall not make alterations,  additions or
                  improvements  to the  Premises  or  install  any  Cable in the
                  Premises  or other  portions  of the  Building  or the Project
                  (collectively  referred  to as  "Alterations")  without  first
                  obtaining  the written  consent of Landlord in each  instance,
                  which consent shall not be  unreasonably  withheld or delayed.
                  However,  Landlord's  consent  shall not be  required  for any
                  Alteration  that  satisfies all of the  following  criteria (a
                  "Cosmetic  Alteration"):  (1) is of a cosmetic  nature such as
                  painting,   wallpapering,   hanging  pictures  and  installing
                  carpeting;  (2)  is  not  visible  from  the  exterior  of the
                  Premises  or  Building;  (3) will not  affect  the  systems or
                  structure  of the  Building;  (4) does not require  work to be
                  performed  inside  the  walls  or  above  the  ceiling  of the
                  Premises;  and (5) costs less than $30,000.00 in the aggregate
                  per project. However, even though consent is not required, the
                  performance  of Cosmetic  Alterations  shall be subject to all
                  the other  provisions of this Section IX.C.  Prior to starting
                  work,   Tenant   shall   furnish   Landlord   with  plans  and
                  specifications  reasonably acceptable to Landlord (which plans
                  and  specifications  shall  be  subject  to  Landlord's  prior
                  approval);  names  of  contractors  reasonably  acceptable  to
                  Landlord   (provided  that  Landlord  may  designate  specific
                  contractors  with  respect  to  Building  systems);  copies of
                  contracts;   necessary  permits  and  approvals;  evidence  of
                  contractor's   and   subcontractor's   insurance   in  amounts
                  reasonably   required  by  Landlord;   and  any  security  for
                  performance that is reasonably  required by Landlord.  Changes
                  to the plans and  specifications  must  also be  submitted  to
                  Landlord for its approval. Alterations shall be constructed in
                  a good and  workmanlike  manner  using  materials of a quality
                  that is at least equal to the quality  designated  by Landlord
                  as the minimum  standard  for the  Building  and the  Project.
                  Landlord  may  designate  reasonable  rules,  regulations  and
                  procedures for the performance of work in the Building and the
                  Project  and,  to the  extent  reasonably  necessary  to avoid
                  disruption  to the  occupants of the Building and the Project,
                  shall have the right to  designate  the time when  Alterations
                  may be performed.  Tenant shall  reimburse  Landlord within 30
                  days after receipt of an invoice for sums paid by Landlord for
                  third party  examination  of Tenant's  plans for  non-Cosmetic
                  Alterations.  In addition,  within 30 days after receipt of an
                  invoice  from  Landlord,  Tenant  shall pay Landlord a fee for
                  Landlord's  oversight  and  coordination  of any  non-Cosmetic
                  Alterations equal to Landlord's  actual,  out-of-pocket  costs
                  incurred  in  overseeing  and  coordinating  any  non-Cosmetic
                  Alterations.  Upon completion, Tenant shall furnish "as-built"
                  plans   (except   for   Cosmetic   Alterations),    completion
                  affidavits, full and final waivers of lien in recordable form,
                  and receipted  bills covering all labor and materials.  Tenant
                  shall assure that the  Alterations  comply with all  insurance
                  requirements  and Laws.  Landlord's  approval of an Alteration
                  shall not be a representation  by Landlord that the Alteration
                  complies with applicable Laws or will be adequate for Tenant's
                  use.
X.       Use of Utility Services by Tenant.
         A.       Electricity,  gas,  water and other  utility  services used by
                  Tenant in the Premises  shall, at Landlord's  option,  be paid
                  for by  Tenant  either:  (1)  through  inclusion  in  Expenses
                  (except as provided in Section X.B. for excess usage);  (2) by
                  a separate charge payable by Tenant to Landlord within 30 days
                  after billing by Landlord; or (3) by separate charge billed by
                  the applicable utility company and payable directly by Tenant.
                  Electrical  service to the Premises may be furnished by one or
                  more companies providing electrical  generation,  transmission
                  and  distribution  services,  and the cost of electricity  may
                  consist of several  different  components or separate  charges
                  for  such  services,  such  as  generation,  distribution  and
                  stranded cost charges. Landlord shall have the exclusive right
                  to select  any  company  providing  electrical  service to the
                  Premises, to aggregate the electrical service for the Project,
                  Property  and  Premises  with  other  buildings,  to  purchase
                  electricity through a broker and/or buyers group and to change
                  the providers and manner of purchasing  electricity.  Landlord
                  shall be entitled to receive a fee (if  permitted  by Law) for
                  the  selection of utility  companies and the  negotiation  and
                  administration of contracts for electricity, provided that the
                  amount  of  such  fee  shall  not  exceed  50% of any  savings
                  obtained by Landlord.
         B.       Tenant's use of electrical service shall not exceed, either in
                  voltage,  rated capacity or overall load,  that which Landlord
                  reasonably deems to be standard for the Building. In addition,
                  in  the  event  electricity  is  paid  for by  Tenant  through
                  inclusion in Expenses,  Tenant's use of electricity  shall not
                  exceed use beyond Normal  Business  Hours.  If Tenant requests
                  permission to consume excess
                                       11
                  electrical  service,  Landlord  may  refuse to  consent or may
                  condition  consent upon  conditions  that Landlord  reasonably
                  elects  (including,  without  limitation,  the installation of
                  utility service upgrades,  meters,  submeters, air handlers or
                  cooling  units),  and the  additional  usage  (to  the  extent
                  permitted by Law), installation and maintenance costs shall be
                  paid by Tenant.  Landlord  shall have the right to  separately
                  meter  electrical  usage  for  the  Premises  and  to  measure
                  electrical usage by survey or other commonly accepted methods.
XI.      Entry by Landlord.
         Landlord,  its agents,  contractors and  representatives  may enter the
Premises to inspect or show the Premises, to clean and make repairs, alterations
or additions to the Premises, and to conduct or facilitate repairs,  alterations
or  additions to any portion of the  Building or the  Project,  including  other
tenants'  premises.  Except in emergencies or to provide  janitorial service (if
Landlord so elects in accordance  with Article IX.A.  above) and other  services
after Normal Business Hours, Landlord shall provide Tenant with reasonable prior
notice of entry into the  Premises,  which may be given  orally.  If  reasonably
necessary for the protection  and safety of Tenant and its  employees,  Landlord
shall have the right to  temporarily  close all or a portion of the  Premises to
perform  repairs,  alterations  and additions.  However,  except in emergencies,
Landlord will not close the Premises if the work can  reasonably be completed on
weekends and after Normal Business Hours. Entry by Landlord shall not constitute
constructive eviction or entitle Tenant to an abatement or reduction of Rent.
XII.     Assignment and Subletting.
         A.       Except in  connection  with a Permitted  Transfer  (defined in
                  Section  XII.E.  below),  Tenant  shall not assign,  sublease,
                  transfer or encumber  any  interest in this Lease or allow any
                  third party to use any portion of the  Premises  (collectively
                  or  individually,  a  "Transfer")  without  the prior  written
                  consent of Landlord,  which consent shall not be  unreasonably
                  withheld   if  Landlord   does  not  elect  to  exercise   its
                  termination   rights  under  Section   XII.B  below.   Without
                  limitation,  it is agreed that Landlord's consent shall not be
                  considered   unreasonably   withheld   if:  (1)  the  proposed
                  transferee's  financial  condition  does not meet the criteria
                  Landlord  uses  to  select  Project   tenants  having  similar
                  leasehold obligations;  (2) the proposed transferee's business
                  is not suitable  for the  Building or the Project  considering
                  the business of the other tenants and the Project's  prestige,
                  or would result in a violation of another tenant's rights; (3)
                  the  proposed  transferee  is a  governmental  agency  or then
                  existing  occupant  of the  Project;  (4) Tenant is in default
                  after the  expiration  of the notice and cure  periods in this
                  Lease; or (5) any portion of the Building, Project or Premises
                  would likely become subject to additional or different Laws as
                  a consequence of the proposed  Transfer.  Notwithstanding  the
                  foregoing,  Landlord  will not  withhold  its  consent  solely
                  because the proposed  subtenant or assignee is a then existing
                  occupant  of the  Project  if  Landlord  does not  have  space
                  available  for lease in the Project that is  comparable to the
                  space Tenant desires to sublet or assign. For purposes hereof,
                  Landlord  shall be deemed to have  comparable  space if it has
                  space available  anywhere in the Project that is approximately
                  the same size as the space Tenant  desires to sublet or assign
                  within  six (6)  months of the  proposed  commencement  of the
                  proposed sublease or assignment.  Tenant shall not be entitled
                  to receive  monetary  damages based upon a claim that Landlord
                  unreasonably  withheld its consent to a proposed  Transfer and
                  Tenant's  sole  remedy  shall be an action to enforce any such
                  provision   through   specific   performance   or  declaratory
                  judgment.  Any attempted Transfer in violation of this Article
                  shall, at Landlord's  option, be void.  Consent by Landlord to
                  one or more  Transfer(s)  shall  not  operate  as a waiver  of
                  Landlord's rights to approve any subsequent  Transfers.  In no
                  event shall any  Transfer  or  Permitted  Transfer  release or
                  relieve Tenant from any obligation under this Lease.
         B.       As part of its request for  Landlord's  consent to a Transfer,
                  Tenant shall provide  Landlord with  financial  statements for
                  the  proposed  transferee,  a  complete  copy of the  proposed
                  assignment,  sublease and other contractual documents and such
                  other information as Landlord may reasonably request. Landlord
                  shall,  by  written  notice  to  Tenant  within 20 days of its
                  receipt of the required information and documentation, either:
                  (1)  consent to the  Transfer  by the  execution  of a consent
                  agreement  in a form  reasonably  designated  by  Landlord  or
                  reasonably  refuse to consent to the  Transfer in writing;  or
                  (2) in the case of an  assignment of the Lease or a subletting
                  which would result in 50% or more of the Premises
                                       12
                  (in the aggregate)  being sublet for more than 75% of the then
                  remaining  Term,  exercise its right to  terminate  this Lease
                  with  respect to the  portion of the  Premises  that Tenant is
                  proposing to assign or sublet.  Any such termination  shall be
                  effective on the proposed  effective  date of the Transfer for
                  which Tenant  requested  consent.  Tenant shall pay Landlord a
                  review fee of $750.00 for  Landlord's  review of any Permitted
                  Transfer or requested Transfer,  provided if Landlord's actual
                  reasonable costs and expenses (including reasonable attorney's
                  fees) exceed $750.00,  Tenant shall reimburse Landlord for its
                  actual reasonable costs and expenses in lieu of a fixed review
                  fee.
         C.       Tenant   shall  pay   Landlord  50%  of  all  rent  and  other
                  consideration  which Tenant receives as a result of a Transfer
                  that is in  excess of the Rent  payable  to  Landlord  for the
                  portion of the  Premises  and Term  covered  by the  Transfer.
                  Tenant shall pay Landlord for  Landlord's  share of any excess
                  within  30  days  after   Tenant's   receipt  of  such  excess
                  consideration.  Tenant may, on an amortized basis, deduct from
                  the excess all brokerage  fees,  construction  costs and legal
                  fees directly  incurred by Tenant and  attributable  solely to
                  the  Transfer.  If Tenant is in Monetary  Default  (defined in
                  Section XIX.A. below),  Landlord may require that all sublease
                  payments be made  directly to  Landlord,  in which case Tenant
                  shall  receive  a credit  against  Rent in the  amount  of any
                  payments received (less Landlord's share of any excess).
         D.       Except as provided below with respect to a Permitted Transfer,
                  if  Tenant  is  a  corporation,   limited  liability  company,
                  partnership,  or similar entity,  and if the entity which owns
                  or controls a majority of the voting shares/rights at any time
                  changes for any reason (including but not limited to a merger,
                  consolidation or reorganization),  such change of ownership or
                  control shall constitute a Transfer  provided,  however,  that
                  none of the  following  shall  constitute  a  Transfer,  or be
                  considered in  determining  whether or not a change of control
                  has occurred:  (i) any transfer of stock in a corporation that
                  is the  Tenant if the stock of such  corporation  is  publicly
                  held and traded through a recognized  security  exchange;  and
                  (ii) if Tenant is a corporation,  any initial public  offering
                  of such stock.  Additionally,  the foregoing change of control
                  provisions shall not apply if at least 80% of its voting stock
                  is owned  by  another  entity,  the  voting  stock of which is
                  listed on a recognized security exchange.
         E.       Tenant may assign  its entire  interest  under this Lease to a
                  successor  to Tenant by  purchase,  merger,  consolidation  or
                  reorganization without the consent of Landlord,  provided that
                  all of the  following  conditions  are satisfied (a "Permitted
                  Transfer"): (1) Tenant is not in default under this Lease; (2)
                  Tenant's  successor shall own all or substantially  all of the
                  assets of  Tenant;  (3)  Tenant's  successor  shall have a net
                  worth which is at least  equal to the greater of Tenant's  net
                  worth at the date of this  Lease or  Tenant's  net worth as of
                  the day prior to the proposed purchase, merger,  consolidation
                  or  reorganization;  (4) the  Permitted Use does not allow the
                  Premises to be used for retail purposes;  and (5) Tenant shall
                  give  Landlord  written  notice at least 15 days  prior to the
                  effective date of the proposed purchase, merger, consolidation
                  or  reorganization.  Tenant's notice to Landlord shall include
                  information and  documentation  showing that each of the above
                  conditions  has been  satisfied.  If  requested  by  Landlord,
                  Tenant's  successor shall sign a commercially  reasonable form
                  of assumption agreement.
XIII.    Liens.
         Tenant shall not permit mechanic's or other liens to be placed upon the
Project,  Property,  Premises or Tenant's  leasehold interest in connection with
any work or service done or purportedly  done by or for benefit of Tenant.  If a
lien is so placed,  Tenant shall,  within 10 days of notice from Landlord of the
filing  of the lien,  fully  discharge  the lien by  settling  the  claim  which
resulted  in the lien or by  bonding  or  insuring  over the lien in the  manner
prescribed  by the  applicable  lien Law. If Tenant fails to discharge the lien,
then, in addition to any other right or remedy of Landlord, Landlord may bond or
insure over the lien or otherwise  discharge  the lien.  Tenant shall  reimburse
Landlord  for any amount  paid by  Landlord  to bond or insure  over the lien or
discharge the lien,  including,  without limitation,  reasonable attorneys' fees
(if and to the  extent  permitted  by Law)  within 30 days  after  receipt of an
invoice from Landlord.
                                       13
XIV.     Indemnity and Waiver of Claims.
         A.       Except to the  extent  caused  by the  negligence  or  willful
                  misconduct  of  Landlord  or  any  Landlord   Related  Parties
                  (defined  below),  Tenant  shall  indemnify,  defend  and hold
                  Landlord, its trustees,  members,  principals,  beneficiaries,
                  partners,   officers,   directors,   employees,   Mortgagee(s)
                  (defined  in  Article  XXVI)  and  agents  ("Landlord  Related
                  Parties")   harmless   against   and  from  all   liabilities,
                  obligations,   damages,  penalties,  claims,  actions,  costs,
                  charges   and   expenses,   including,   without   limitation,
                  reasonable attorneys' fees and other professional fees (if and
                  to the extent  permitted by Law),  which may be imposed  upon,
                  incurred  by or  asserted  against  Landlord  or  any  of  the
                  Landlord  Related  Parties and arising out of or in connection
                  with any damage or injury  occurring  in the  Premises  or any
                  acts or omissions (including violations of Law) of Tenant, the
                  Tenant  Related  Parties  (defined  below) or any of  Tenant's
                  transferees, contractors or licensees.
         B.       Except to the  extent  caused  by the  negligence  or  willful
                  misconduct of Tenant or any Tenant  Related  Parties  (defined
                  below), Landlord shall indemnify,  defend and hold Tenant, its
                  trustees,  members,   principals,   beneficiaries,   partners,
                  officers,  directors,  employees and agents  ("Tenant  Related
                  Parties")   harmless   against   and  from  all   liabilities,
                  obligations,   damages,  penalties,  claims,  actions,  costs,
                  charges   and   expenses,   including,   without   limitation,
                  reasonable  attorneys fees and other professional fees (if and
                  to the extent  permitted by Law),  which may be imposed  upon,
                  incurred  by or asserted  against  Tenant or any of the Tenant
                  Related  Parties and arising out of or in connection  with the
                  acts or omissions  (including  violations of Law) of Landlord,
                  the Landlord Related Parties or any of Landlord's contractors.
         C.       Landlord and the Landlord  Related Parties shall not be liable
                  for,  and  Tenant  waives,  all  claims  for loss or damage to
                  Tenant's  business  or  loss,  theft  or  damage  to  Tenant's
                  Property or the property of any person claiming by, through or
                  under  Tenant  resulting  from:  (1) wind or weather;  (2) the
                  failure  of  any   sprinkler,   heating  or   air-conditioning
                  equipment,  any  electric  wiring  or any gas,  water or steam
                  pipes; (3) the backing up of any sewer pipe or downspout;  (4)
                  the  bursting,  leaking or running of any tank,  water closet,
                  drain or other  pipe;  (5)  water,  snow or ice upon or coming
                  through the roof, skylight,  stairs, doorways,  windows, walks
                  or any other place upon or near the  Building or the  Project;
                  (6) any act or omission  of any party  other than  Landlord or
                  Landlord  Related  Parties;  and (7) any causes not reasonably
                  within the control of Landlord.  Tenant  shall  insure  itself
                  against such losses under Article XV below.
XV.      Insurance.
         Tenant  shall carry and  maintain the  following  insurance  ("Tenant's
Insurance"),  at its sole cost and expense:  (1)  Commercial  General  Liability
Insurance  applicable  to the Premises and its  appurtenances  providing,  on an
occurrence basis, a minimum combined single limit of $3,000,000.00; (2) All Risk
Property/Business   Interruption  Insurance,  including  flood  and  earthquake,
written  at  replacement  cost  value and with a  replacement  cost  endorsement
covering all of Tenant's trade fixtures, equipment, furniture and other personal
property within the Premises ("Tenant's  Property");  (3) Workers'  Compensation
Insurance  as  required  by the state in which the  Premises  is located  and in
amounts as may be required by applicable  statute;  and (4) Employers  Liability
Coverage of at least  $1,000,000.00  per occurrence.  Any company writing any of
Tenant's  Insurance shall have an A.M. Best rating of not less than A-VIII.  All
Commercial  General  Liability  Insurance  policies shall name Tenant as a named
insured and Landlord (or any  successor),  Equity  Office  Properties  Trust,  a
Maryland real estate  investment  trust, EOP Operating  Limited  Partnership,  a
Delaware  limited  partnership,   and  their  respective  members,   principals,
beneficiaries,  partners, officers, directors,  employees, and agents, and other
designees  of  Landlord as the  interest  of such  designees  shall  appear,  as
additional   insureds.   All  policies  of  Tenant's   Insurance  shall  contain
endorsements  that the insurer(s) shall give Landlord and its designees at least
30 days' advance  written  notice of any change,  cancellation,  termination  or
lapse  of  insurance.  Tenant  shall  provide  Landlord  with a  certificate  of
insurance  evidencing  Tenant's  Insurance  prior to the earlier to occur of the
Commencement Date or the date Tenant is provided with possession of the Premises
for any reason,  and upon  renewals at least 15 days prior to the  expiration of
the  insurance  coverage.  Landlord  shall  maintain so called All Risk property
insurance  on the  Building in an amount  equal to 90% of the  replacement  cost
thereof, as reasonably estimated by Landlord. Except as specifically provided to
the  contrary,  the  limits of either  party's'  insurance  shall not limit such
party's liability under this Lease.
                                       14
XVI.     Subrogation.
         Notwithstanding  anything in this Lease to the  contrary,  Landlord and
Tenant hereby waive and shall cause their respective insurance carriers to waive
any and all rights of recovery,  claim,  action or causes of action  against the
other  and  their  respective  trustees,  principals,  beneficiaries,  partners,
officers,  directors,  agents,  and  employees,  for any loss or damage that may
occur to Landlord or Tenant or any party  claiming by, through or under Landlord
or Tenant, as the case may be, with respect to Tenant's  Property,  the Project,
the  Building,  the  Premises,  any  additions or  improvements  to the Project,
Building or Premises, or any contents thereof, including all rights of recovery,
claims, actions or causes of action arising out of the negligence of Landlord or
any Landlord  Related  Parties or the negligence of Tenant or any Tenant Related
Parties, which loss or damage is (or would have been, had the insurance required
by this Lease been carried) covered by insurance.
XVII.    Casualty Damage.
         A.       If all or any part of the Premises is damaged by fire or other
                  casualty, Tenant shall immediately notify Landlord in writing.
                  During any  period of time that all or a  material  portion of
                  the Premises is rendered untenantable as a result of a fire or
                  other  casualty,  the Rent shall  ▇▇▇▇▇ for the portion of the
                  Premises that is untenantable and not used by Tenant. Landlord
                  shall  have the right to  terminate  this  Lease  if:  (1) the
                  Building  or  the  Project   shall  be  damaged  so  that,  in
                  Landlord's  reasonable  judgment,  substantial  alteration  or
                  reconstruction  of  the  Building  or  the  Project  shall  be
                  required  (whether or not the Premises has been damaged);  (2)
                  Landlord is not  permitted  by Law to rebuild the  Building or
                  the Project in  substantially  the same form as existed before
                  the fire or casualty;  (3) the Premises  have been  materially
                  damaged  and there is less than 2 years of the Term  remaining
                  on the date of the casualty;  (4) any Mortgagee  requires that
                  the  insurance  proceeds  be  applied  to the  payment  of the
                  mortgage  debt;  or  (5) a  material  uninsured  loss  to  the
                  Building or the Project  occurs.  Landlord  may  exercise  its
                  right to terminate  this Lease by notifying  Tenant in writing
                  within 90 days  after the date of the  casualty.  If  Landlord
                  does  not  terminate  this  Lease,   Landlord  shall  promptly
                  commence and proceed with  reasonable  diligence to repair and
                  restore the Building and the Leasehold Improvements (excluding
                  any Alterations  that were performed by Tenant in violation of
                  this Lease).  However,  in no event shall Landlord be required
                  to  spend  more  than  the  insurance   proceeds  received  by
                  Landlord.  Landlord shall not be liable for any loss or damage
                  to Tenant's Property or to the business of Tenant resulting in
                  any way from the fire or other casualty or from the repair and
                  restoration  of the damage.  Landlord and Tenant  hereby waive
                  the provisions of any Law relating to the matters addressed in
                  this  Article,  and agree  that  their  respective  rights for
                  damage  to or  destruction  of the  Premises  shall  be  those
                  specifically provided in this Lease.
         B.       If  all  or  any  portion  of  the  Premises   shall  be  made
                  untenantable by fire or other casualty,  Landlord shall,  with
                  reasonable   promptness,   cause  an   architect   or  general
                  contractor selected by Landlord to provide Landlord and Tenant
                  with a written  estimate  of the  amount of time  required  to
                  substantially  complete  the  repair  and  restoration  of the
                  Premises  and  make  the  Premises   tenantable  again,  using
                  standard  working  methods  ("Completion  Estimate").  If  the
                  Completion Estimate indicates that the Premises cannot be made
                  tenantable  within  210 days  from the  date  the  repair  and
                  restoration is started, then regardless of anything in Section
                  XVII.A  above to the  contrary,  either  party  shall have the
                  right to terminate  this Lease by giving written notice to the
                  other of such  election  within 10 days  after  receipt of the
                  Completion Estimate. Tenant, however, shall not have the right
                  to terminate  this Lease if the fire or casualty was caused by
                  the  negligence or  intentional  misconduct of Tenant,  Tenant
                  Related Parties or any of Tenant's transferees, contractors or
                  licensees.
XVIII.   Condemnation.
         Either party may terminate this Lease if the whole or any material part
of the Premises shall be taken or condemned for any public or  quasi-public  use
under Law, by eminent  domain or private  purchase in lieu thereof (a "Taking").
Landlord  shall also have the right to terminate this Lease if there is a Taking
of any  portion of the  Building,  Property  or Project  which  would  leave the
remainder  of the  Building  or the  Project  unsuitable  for  use as an  office
building or an
                                       15
office  park,  as the case  may be,  in a  manner  comparable  to the use of the
Building  and/or Project prior to the Taking.  In order to exercise its right to
terminate  the Lease,  Landlord  or  Tenant,  as the case may be,  must  provide
written notice of termination to the other within 45 days after the  terminating
party  first  receives  notice  of the  Taking.  Any such  termination  shall be
effective as of the date the  physical  taking of the Premises or the portion of
the Project,  Building or Property occurs. If this Lease is not terminated,  the
Rentable  Square  Footage of the Building,  the Rentable  Square  Footage of the
Premises, the Rentable Square Footage of the Project and Tenant's Pro Rata Share
shall,  if applicable,  be  appropriately  adjusted.  In addition,  Rent for any
portion of the Premises taken or condemned  shall be abated during the unexpired
Term of this Lease  effective  when the  physical  taking of the  portion of the
Premises occurs. All compensation awarded for a Taking, or sale proceeds,  shall
be the property of Landlord, any right to receive compensation or proceeds being
expressly  waived by Tenant.  However,  Tenant may file a separate  claim at its
sole cost and expense for Tenant's Property and Tenant's  reasonable  relocation
expenses,  provided  the filing of the claim does not  diminish  the award which
would otherwise be receivable by Landlord.
XIX.     Events of Default.
         Tenant  shall be  considered  to be in  default  of this Lease upon the
occurrence of any of the following events of default:
         A.       Tenant's  failure  to pay when due all or any  portion  of the
                  Rent, if the failure continues for 3 days after written notice
                  to Tenant ("Monetary Default").
         B.       Tenant's  failure  (other  than a Monetary  Default) to comply
                  with any term,  provision  or covenant  of this Lease,  if the
                  failure is not cured  within 30 days after  written  notice to
                  Tenant.   However,   if  Tenant's  failure  to  comply  cannot
                  reasonably  be cured  within 30 days,  Tenant shall be allowed
                  additional  time (not to exceed 60 days,  subject to extension
                  due to Force  Majeure) as is reasonably  necessary to cure the
                  failure so long as: (1) Tenant  commences  to cure the failure
                  within 30 days, and (2) Tenant diligently  pursues a course of
                  action that will cure the  failure and bring  Tenant back into
                  compliance  with the Lease.  However,  if Tenant's  failure to
                  comply  creates a hazardous  condition,  the  failure  must be
                  cured  immediately  upon  notice to Tenant.  In  addition,  if
                  Landlord  provides  Tenant with notice of Tenant's  failure to
                  comply with any particular term,  provision or covenant of the
                  Lease on 3  occasions  during  any 12 month  period,  Tenant's
                  subsequent  violation  of such  term,  provision  or  covenant
                  shall, at Landlord's  option, be an incurable event of default
                  by Tenant.
         C.       Tenant or any Guarantor becomes insolvent, makes a transfer in
                  fraud of creditors or makes an  assignment  for the benefit of
                  creditors, or admits in writing its inability to pay its debts
                  when due.
         D.       The leasehold estate is taken by process or operation of Law.
         E        Tenant is in default  beyond any notice and cure period  under
                  any other lease or  agreement  with  Landlord at the  Project,
                  including,  without  limitation,  any lease or  agreement  for
                  parking.
XX.      Remedies.
         A.       Upon the  occurrence  of any event or events of default  under
                  this Lease, whether enumerated in Article XIX or not, Landlord
                  shall  have  the  option  to  pursue  any  one or  more of the
                  following  remedies  without any notice  (except as  expressly
                  prescribed  herein) or demand whatsoever (and without limiting
                  the  generality of the foregoing,  Tenant hereby  specifically
                  waives  notice  and  demand  for  payment  of  Rent  or  other
                  obligations  and  waives  any and all other  notices or demand
                  requirements  imposed by  applicable  law,  provided  that any
                  notice of default given  pursuant to this Lease  complies with
                  the  requirements  specified in California  Civil Code Section
                  1161 et. seq.):
                  1.       Terminate this Lease and Tenant's right to possession
                           of the  Premises  and recover from Tenant an award of
                           damages equal to the sum of the following:
                           (a)      The Worth at the Time of Award of the unpaid
                                    Rent  which  had been  earned at the time of
                                    termination;
                                       16
                           (b)      The Worth at the Time of Award of the amount
                                    by which the unpaid  Rent  which  would have
                                    been earned after termination until the time
                                    of award  exceeds  the  amount  of such Rent
                                    loss that Tenant  affirmatively proves could
                                    have been reasonably avoided;
                           (c)      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 the
                                    amount  of  such   Rent  loss  that   Tenant
                                    affirmatively  proves  could  be  reasonably
                                    avoided;
                           (d)      Any other  amount  necessary  to  compensate
                                    Landlord  for  all  the   detriment   either
                                    proximately  caused by  Tenant's  failure to
                                    perform  Tenant's   obligations  under  this
                                    Lease  or which in the  ordinary  course  of
                                    things would be likely to result  therefrom;
                                    and
                           (e)      All such other  amounts in addition to or in
                                    lieu of the  foregoing  as may be  permitted
                                    from time to time under applicable law.
                           The  "Worth  at the  Time of  Award"  of the  amounts
                           referred  to in  parts  (a) and (b)  above,  shall be
                           computed by allowing  interest at the lesser of a per
                           annum rate equal to: (i) the  greatest per annum rate
                           of  interest   permitted  from  time  to  time  under
                           applicable  law,  or (ii) the  Prime  Rate  plus four
                           percent (4%). For purposes  hereof,  the "Prime Rate"
                           shall  be  the  per  annum   interest  rate  publicly
                           announced  as its prime or base  rate by a  federally
                           insured  bank  selected  by  Landlord in the State of
                           California.  The  "Worth at the Time of Award" of the
                           amount  referred  to in part  (c),  above,  shall  be
                           computed by  discounting  such amount at the discount
                           rate of the Federal  Reserve Bank of San Francisco at
                           the time of award plus one percent (1%);
                  2.       Employ the remedy  described in California Civil Code
                           ss.  1951.4  (Landlord  may  continue  this  Lease in
                           effect  after  Tenant's  breach and  abandonment  and
                           recover  Rent as it  becomes  due,  if Tenant has the
                           right to sublet or assign, subject only to reasonable
                           limitations); or
                  3.       Notwithstanding  Landlord's  exercise  of the  remedy
                           described  in  California  Civil  Code ss.  1951.4 in
                           respect  of an event or  events of  default,  at such
                           time thereafter as Landlord may elect in writing,  to
                           terminate this Lease and Tenant's right to possession
                           of the  Premises  and  recover an award of damages as
                           provided above in Paragraph XX.A.1.
         B.       The subsequent  acceptance of Rent hereunder by Landlord shall
                  not be deemed to be a waiver of any preceding breach by Tenant
                  of any term,  covenant or condition of this Lease,  other than
                  the failure of Tenant to pay the particular  Rent so accepted,
                  regardless of Landlord's knowledge of such preceding breach at
                  the time of  acceptance of such Rent. No waiver by Landlord of
                  any breach hereof shall be effective  unless such waiver is in
                  writing and signed by Landlord.
         C.       TENANT HEREBY  WAIVES ANY AND ALL RIGHTS  CONFERRED BY SECTION
                  3275 OF THE CIVIL CODE OF CALIFORNIA  AND BY SECTIONS 1174 (c)
                  AND 1179 OF THE CODE OF CIVIL  PROCEDURE OF CALIFORNIA AND ANY
                  AND ALL  OTHER  LAWS AND  RULES  OF LAW  FROM  TIME TO TIME IN
                  EFFECT DURING THE LEASE TERM  PROVIDING THAT TENANT SHALL HAVE
                  ANY RIGHT TO REDEEM, REINSTATE OR RESTORE THIS LEASE FOLLOWING
                  ITS  TERMINATION  BY REASON OF  TENANT'S  BREACH.  TENANT ALSO
                  HEREBY  WAIVES,  TO THE FULLEST  EXTENT  PERMITTED BY LAW, THE
                  RIGHT  TO TRIAL BY JURY IN ANY  LITIGATION  ARISING  OUT OF OR
                  RELATING TO THIS LEASE.
         D.       No  right or  remedy  herein  conferred  upon or  reserved  to
                  Landlord  is intended  to be  exclusive  of any other right or
                  remedy,   and  each  and  every  right  and  remedy  shall  be
                  cumulative  and in addition to any other right or remedy given
                  hereunder   or  now  or  hereafter   existing  by   agreement,
                  applicable  law or in equity.  In addition  to other  remedies
                  provided in this Lease,  Landlord  shall be  entitled,  to the
                  extent permitted by applicable law, to injunctive  relief,  or
                  to a decree  compelling  performance  of any of the covenants,
                  agreements,  conditions or provisions of this Lease, or to any
                  other remedy allowed to Landlord at law or in
                                       17
                  equity.  Forbearance by Landlord to enforce one or more of the
                  remedies herein provided upon an event of default shall not be
                  deemed or construed to constitute a waiver of such default.
         E.       This  Article XX shall be  enforceable  to the maximum  extent
                  such  enforcement is not prohibited by applicable law, and the
                  unenforceability  of any  portion  thereof  shall not  thereby
                  render unenforceable any other portion.
XXI.     Limitation of Liability.
         NOTWITHSTANDING  ANYTHING TO THE CONTRARY  CONTAINED IN THIS LEASE, THE
LIABILITY OF LANDLORD (AND OF ANY SUCCESSOR LANDLORD) TO TENANT SHALL BE LIMITED
TO THE  INTEREST  OF  LANDLORD  IN THE  PROJECT.  TENANT  SHALL  LOOK  SOLELY TO
LANDLORD'S  INTEREST IN THE PROJECT  FOR THE  RECOVERY OF ANY  JUDGMENT OR AWARD
AGAINST  LANDLORD.  NEITHER  LANDLORD  NOR ANY LANDLORD  RELATED  PARTY SHALL BE
PERSONALLY  LIABLE FOR ANY  JUDGMENT OR  DEFICIENCY.  BEFORE  FILING SUIT FOR AN
ALLEGED  DEFAULT BY LANDLORD,  TENANT SHALL GIVE  LANDLORD AND THE  MORTGAGEE(S)
(DEFINED IN ARTICLE  XXVI BELOW) WHOM TENANT HAS BEEN  NOTIFIED  HOLD  MORTGAGES
(DEFINED IN ARTICLE XXVI BELOW) ON THE PROJECT, PROPERTY,  BUILDING OR PREMISES,
NOTICE AND COMMERCIALLY  REASONABLE TIME TO CURE THE ALLEGED  DEFAULT.  LANDLORD
AGREES TO USE GOOD FAITH,  COMMERCIALLY REASONABLE EFFORTS TO COMMENCE TO CURE A
FAILURE BY LANDLORD TO COMPLY WITH THE TERMS OF THIS LEASE  WITHIN 30 DAYS AFTER
LANDLORD'S RECEIPT OF NOTIFICATION OF SUCH FAILURE FROM TENANT.
XXII.    No Waiver.
         Either  party's  failure  to  declare  a default  immediately  upon its
occurrence,  or delay in taking  action  for a default  shall not  constitute  a
waiver of the  default,  nor shall it  constitute  an estoppel.  Either  party's
failure to enforce its rights for a default shall not constitute a waiver of its
rights regarding any subsequent default. Receipt by Landlord of Tenant's keys to
the Premises shall not constitute an acceptance or surrender of the Premises.
XXIII.   Quiet Enjoyment
         Tenant shall,  and may  peacefully  have,  hold and enjoy the Premises,
subject  to the terms of this  Lease,  provided  Tenant  pays the Rent and fully
performs  all of its  covenants  and  agreements.  This  covenant  and all other
covenants of Landlord  shall be binding upon  Landlord and its  successors  only
during its or their respective  periods of ownership of the Building,  and shall
not be a personal covenant of Landlord or the Landlord Related Parties.
XXIV.    Relocation.
         INTENTIONALLY OMITTED.
XXV.     Holding Over.
         Except for any  permitted  occupancy by Tenant under  Article  VIII, if
Tenant fails to surrender the Premises at the expiration or earlier  termination
of this Lease,  occupancy of the Premises  after the  termination  or expiration
shall be that of a tenancy at  sufferance.  Tenant's  occupancy  of the Premises
during the  holdover  shall be subject to all the terms and  provisions  of this
Lease and Tenant shall pay an amount (on a per month basis without reduction for
partial months during the holdover) equal to 150% of the greater of: (1) the sum
of the Base Rent and Additional  Rent due for the period  immediately  preceding
the holdover; or (2) the fair market gross rental for the Premises as reasonably
determined  by  Landlord.  No holdover by Tenant or payment by Tenant  after the
expiration or early  termination  of this Lease shall be construed to extend the
Term or prevent  Landlord from immediate  recovery of possession of the Premises
by summary  proceedings or otherwise.  In addition to the payment of the amounts
provided above, if Landlord is unable to deliver possession of the Premises to a
new tenant, or to perform improvements for a new tenant, as a result of Tenant's
holdover and Tenant fails to vacate the Premises  within 15 days after  Landlord
notifies  Tenant of  Landlord's  inability  to  deliver  possession,  or perform
improvements,  Tenant shall be liable to Landlord  for all  damages,  including,
without  limitation,  consequential  damages,  that  Landlord  suffers  from the
holdover.
                                       18
XXVI.    Subordination to Mortgages; Estoppel Certificate.
         Tenant accepts this Lease subject and  subordinate to any  mortgage(s),
deed(s) of trust,  ground lease(s) or other lien(s) now or subsequently  arising
upon the Premises, the Building or the Property or the Project, and to renewals,
modifications,  refinancings and extensions thereof (collectively referred to as
a  "Mortgage").  The party having the benefit of a Mortgage shall be referred to
as a "Mortgagee".  This clause shall be self-operative,  but upon request from a
Mortgagee,   Tenant  shall  execute  a  commercially  reasonable   subordination
agreement in favor of the Mortgagee.  In lieu of having the Mortgage be superior
to this Lease, a Mortgagee  shall have the right at any time to subordinate  its
Mortgage to this Lease. If requested by a successor-in-interest to all or a part
of Landlord's interest in the Lease, Tenant shall,  without charge, attom to the
successor-in-interest.  Landlord  and Tenant  shall  each,  within 10 days after
receipt of a written  request  from the other,  execute  and deliver an estoppel
certificate to those parties as are reasonably requested by the other (including
a Mortgagee or prospective purchaser).  The estoppel certificate shall include a
statement  certifying that this Lease is unmodified (except as identified in the
estoppel  certificate)  and in full force and  effect,  describing  the dates to
which Rent and other charges have been paid,  representing that, to such party's
actual  knowledge,  there is no default  (or  stating  the nature of the alleged
default)  and  indicating  other  matters  with  respect  to the Lease  that may
reasonably be requested. Notwithstanding the foregoing, as a condition precedent
to the subordination of this Lease, Landlord shall be required to provide Tenant
with a  non-disturbance,  subordination  and  attornment  agreement  in favor of
Tenant from any Mortgagee who comes into existence after the Commencement  Date.
Such non-disturbance,  subordination and attornment agreement in favor of Tenant
shall provide that, so long as Tenant is paying the rent due under the Lease and
is not otherwise in default under the Lease,  its right to possession  and other
terms of the Lease shall remain in full force and effect. Such  non-disturbance,
subordination and attornment  agreement may include additional time on behalf of
the  Mortgagee  to cure  defaults of the  Landlord  and provide that (a) neither
Mortgagee nor any successor-in-interest shall be bound by (i) any payment of the
Base Rent,  Additional Rent, or other sum due hereunder for more than 1 month in
advance or (ii) any  amendment  or  modification  to the Lease made  without the
express written consent of Mortgagee or any  successor-in-interest;  (b) neither
Mortgagee  nor  any  successor-in-interest  will  be  liable  for (i) any act or
omission or  warranties of any prior  landlord  (including  Landlord),  (ii) the
breach of any warranties or obligations relating to construction of improvements
on the property or any tenant finish work performed or to have been performed by
any prior  landlord  (including  Landlord),  or (iii) the return of any security
deposit, except to the extent such deposits have been received by Mortgagee; and
(c)  neither  Mortgagee  nor any  successor-in-interest  shall be subject to any
offsets  or  defenses  which  Tenant  might  have  against  any  prior  landlord
(including Landlord).
XXVII.   Attorneys' Fees.
         If either party institutes a suit against the other for violation of or
to  enforce  any  covenant  or  condition  of this  Lease,  or if  either  party
intervenes  in any suit in which the other is a party to enforce or protect  its
interest or rights,  the prevailing  party shall be entitled to all of its costs
and expenses, including, without limitation, reasonable attorneys' fees.
XXVIII.  Notice.
         If  a  demand,  request,  approval,  consent  or  notice  (collectively
referred to as a "notice")  shall or may be given to either  party by the other,
the notice shall be in writing and  delivered by hand or sent by  registered  or
certified mail with return receipt  requested,  or sent by overnight or same day
courier  service  at the  party's  respective  Notice  Address(es)  set forth in
Article I,  except that if Tenant has  vacated  the  Premises  (or if the Notice
Address  for Tenant is other than the  Premises,  and  Tenant has  vacated  such
address)  without  providing  Landlord a new Notice Address,  Landlord may serve
notice in any manner  described in this Article or in any other manner permitted
by Law.  Each  notice  shall be  deemed to have  been  received  or given on the
earlier to occur of actual  delivery  or the date on which  delivery is refused,
or, if Tenant has vacated the  Premises  or the other  Notice  Address of Tenant
without providing a new Notice Address, three (3) days after notice is deposited
in the U.S. mail or with a courier service in the manner described above. Either
party may,  at any time,  change its  Notice  Address by giving the other  party
written notice of the new address in the manner described in this Article.
XXIX.    Excepted Rights.
         This  Lease does not grant any rights to light or air over or about the
Building or the Project. Landlord excepts and reserves exclusively to itself the
use of: (1)  roofs,  (2)  telephone,  electrical  and  janitorial  closets,  (3)
equipment rooms, Building risers or similar areas, (4) rights
                                       19
to the  land  and  improvements  below  the  floor  of  the  Premises,  (5)  the
improvements  and  air  rights  above  the  Premises  and the  Project,  (6) the
improvements and air rights outside the demising walls of the Premises,  and (7)
the areas within the Premises  used for the  installation  of utility  lines and
other  installations  serving  occupants  of the  Building  and/or the  Project.
Landlord has the right to change the name or address of the Building  and/or the
Project.  Landlord also has the right to make such other changes to the Project,
Property and Building as Landlord deems appropriate, provided the changes do not
materially  affect  Tenant's  ability to use the Premises for the Permitted Use.
Landlord shall also have the right (but not the obligation) to temporarily close
the Building and/or the Project if Landlord reasonably  determines that there is
an imminent  danger of  significant  damage to the Building or the Project or of
personal injury to Landlord's  employees or the occupants of the Building and/or
the Project.  The  circumstances  under which Landlord may temporarily close the
Building  and/or the  Project  shall  include,  without  limitation,  electrical
interruptions,  hurricanes  and civil  disturbances.  A closure of the  Building
and/or the Project under such circumstances  shall not constitute a constructive
eviction nor entitle Tenant to an abatement or reduction of Rent.
XXX.     Surrender of Premises.
         At the  expiration  or earlier  termination  of this Lease or  Tenant's
right of possession,  Tenant shall remove Tenant's  Property (defined in Article
XV) from the Premises,  and quit and  surrender the Premises to Landlord,  broom
clean, and in good order, condition and repair, ordinary wear and tear excepted.
Tenant shall also be required to remove the Required  Removables  in  accordance
with Article VIII. If Tenant fails to remove any of Tenant's  Property  within 2
days after the  termination  of this Lease or of Tenant's  right to  possession,
Landlord,  at  Tenant's  sole  cost  and  expense,  shall be  entitled  (but not
obligated)  to  remove  and  store  Tenant's  Property.  Landlord  shall  not be
responsible  for the value,  preservation  or safekeeping of Tenant's  Property.
Tenant  shall pay  Landlord,  upon  demand,  the  expenses  and storage  charges
incurred for Tenant's Property.  In addition, if Tenant fails to remove Tenant's
Property from the Premises or storage,  as the case may be, within 30 days after
written  notice,  Landlord  may deem all or any part of Tenant's  Property to be
abandoned,  and title to  Tenant's  Property  shall be deemed to be  immediately
vested in Landlord.
XXXI.    Miscellaneous.
         A.       This Lease and the rights and obligations of the parties shall
                  be interpreted,  construed and enforced in accordance with the
                  Laws of the State of California and Landlord and Tenant hereby
                  irrevocably  consent to the  jurisdiction  and proper venue of
                  such state.  If any term or  provision  of this Lease shall to
                  any extent be invalid or unenforceable,  the remainder of this
                  Lease shall not be affected,  and each provision of this Lease
                  shall be valid and enforced to the fullest extent permitted by
                  Law.  The  headings and titles to the Articles and Sections of
                  this Lease are for  convenience  only and shall have no effect
                  on the interpretation of any part of the Lease.
         B.       Tenant shall not record this Lease or any  memorandum  without
                  Landlord's prior written consent.
         C.       Landlord and Tenant hereby waive any right to trial by jury in
                  any eviction or forcible entry and detainer  action or similar
                  proceeding  based upon,  or related to, the subject  matter of
                  this Lease.
         D.       Whenever a period of time is  prescribed  for the taking of an
                  action  by  Landlord  or  Tenant,  the  period of time for the
                  performance  of such action shall be extended by the number of
                  days that the performance is actually  delayed due to strikes,
                  acts of God,  shortages  of labor  or  materials,  war,  civil
                  disturbances and other causes beyond the reasonable control of
                  the performing  party ("Force  Majeure").  However,  events of
                  Force  Majeure  shall not  extend  any  period of time for the
                  payment of Rent or other sums  payable by either  party or any
                  period of time for the written  exercise of an option or right
                  by either party.
         E.       Landlord shall have the right to transfer and assign, in whole
                  or in part, all of its rights and obligations under this Lease
                  and in the  Project,  Building  and/or  Property  referred  to
                  herein, and upon such transfer Landlord shall be released from
                  any further obligations  hereunder,  and Tenant agrees to look
                  solely  to the  successor  in  interest  of  Landlord  for the
                  performance   of   such   obligations.   Notwithstanding   the
                  foregoing,  unless such liability is assumed in writing by its
                  successor in interest hereunder,  Landlord shall remain liable
                  after its period of
                                       20
                  ownership  with respect to any sums due in  connection  with a
                  breach or default that arose during such period of ownership.
         F.       Tenant  represents  that it has dealt  directly  with and only
                  with the  Broker as a broker in  connection  with this  Lease.
                  Tenant  shall  indemnify  and hold  Landlord  and the Landlord
                  Related Parties  harmless from all claims of any other brokers
                  claiming to have  represented  Tenant in connection  with this
                  Lease.  Landlord  agrees to indemnify  and hold Tenant and the
                  Tenant Related Parties harmless from all claims of any brokers
                  claiming to have represented  Landlord in connection with this
                  Lease.
         G.       Tenant  covenants,  warrants  and  represents  that:  (1) each
                  individual  executing,  attesting and/or delivering this Lease
                  on  behalf  of  Tenant  is  authorized  to do so on  behalf of
                  Tenant;  (2) this Lease is binding upon Tenant; and (3) Tenant
                  is duly  organized  and  legally  existing in the state of its
                  organization  and is  qualified to do business in the State of
                  California.  If there is more than one Tenant, or if Tenant is
                  comprised  of more than one party or entity,  the  obligations
                  imposed upon Tenant shall be joint and several  obligations of
                  all the parties and entities. Notices, payments and agreements
                  given or made by, with or to any one person or entity shall be
                  deemed to have been given or made by, with and to all of them.
         H.       Time is of the essence  with  respect to Tenant's  exercise of
                  any expansion,  renewal or extension rights granted to Tenant.
                  This Lease shall create only the  relationship of landlord and
                  tenant  between  the  parties,  and not a  partnership,  joint
                  venture  or  any  other  relationship.   This  Lease  and  the
                  covenants and conditions in this Lease shall inure only to the
                  benefit of and be binding  only upon  Landlord  and Tenant and
                  their permitted successors and assigns.
         I.       The  expiration  of the  Term,  whether  by  lapse  of time or
                  otherwise,  shall not relieve either party of any  obligations
                  which  accrued  prior to or which may continue to accrue after
                  the  expiration or early  termination  of this Lease.  Without
                  limiting  the scope of the prior  sentence,  it is agreed that
                  Tenant's obligations under Articles IV, VIIl, XIV, XX, XXV and
                  XXX shall survive the expiration or early  termination of this
                  Lease.
         J.       Landlord  has  delivered  a copy of this  Lease to Tenant  for
                  Tenant's  review  only,  and  the  delivery  of  it  does  not
                  constitute  an offer to Tenant or an option.  This Lease shall
                  not be  effective  against any party  hereto until an original
                  copy of this Lease has been signed by such party.
         K.       All understandings and agreements  previously made between the
                  parties are  superseded  by this Lease,  and neither  party is
                  relying upon any  warranty,  statement or  representation  not
                  contained in this Lease.  This Lease may be modified only by a
                  written agreement signed by Landlord and Tenant.
         L.       Tenant,  within 15 days after request,  shall provide Landlord
                  with a current financial  statement and such other information
                  as  Landlord  may  reasonably  request  in order  to  create a
                  "business profile" of Tenant and determine Tenant's ability to
                  fulfill its obligations under this Lease.  Landlord,  however,
                  shall not require  Tenant to provide such  information  unless
                  Landlord is requested to produce the information in connection
                  with a  proposed  financing  or  sale  of the  Building.  Upon
                  written  request  by  Tenant,  Landlord  shall  enter  into  a
                  commercially reasonable confidentiality agreement covering any
                  confidential information that is disclosed by Tenant.
         M.       This Lease shall be subject to the terms and conditions of (a)
                  Declaration  Of  Covenants,  Conditions  And  Restrictions  Of
                  Shoreline  Technology Park  ("Declaration")  imposing  certain
                  covenants,   conditions  and   restrictions  on  the  use  and
                  management of Shoreline  Technology  Park,  (b) all applicable
                  Laws, (c) the Bylaws  ("Bylaws") and Articles of Incorporation
                  ("Articles")  of  any  association   ("Association")   now  or
                  hereafter  created  and  charged  with the  responsibility  of
                  managing  Shoreline  Technology  Park in  accordance  with the
                  Declaration,  and (d) the rules ("Rules") adopted from time to
                  time by the  Association  in accordance  with the  Declaration
                  providing for restrictions on the use of Shoreline  Technology
                  Park. Any failure to comply with the Governing Documents shall
                  be a default under the terms of this Lease.
                                       21
XXXlI.   Entire Agreement.
         This Lease and the following  exhibits and  attachments  constitute the
entire  agreement  between the parties and  supersede all prior  agreements  and
understandings related to the Premises,  including all lease proposals,  letters
of intent and other  documents:  Exhibit A-I (Outline and Location of Premises),
Exhibit A-2 (Outline and Location of Project), Exhibit A-3 (Outline and Location
of  Recreational   Area),   Exhibit  B  (Rules  and   Regulations),   Exhibit  C
(Commencement Letter), Exhibit D (Work Letter Agreement),  Exhibit E (Additional
Provisions),  Exhibit F  (Parking  Agreement)  and  Exhibit G (Form of Letter of
Credit).
         Landlord  and Tenant  have  executed  this Lease as of the day and year
first above written.
                             LANDLORD:
                             EOP-SHORELINE TECHNOLOGY PARK, L.L.C., a
                             Delaware limited liability company
                             By: EOP Operating Limited Partnership,
                                 a Delaware limited partnership, its sole member
                                 By: Equity Office Properties Trust, a Maryland
                                     real estate investment rust, its managing
                                     general partner
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                           ----------------------------
                                     Title: Senior Vice President
                                            ---------------------------
                             TENANT:
                             COMMTOUCH SOFTWARE, INC., a California
                             corporation
                                     By: /s/ ▇▇▇▇▇ ▇. ???????
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ???????
                                           ----------------------------
                                     Title: Chief Financial Officer
                                            ---------------------------
                                     By: /s/ ▇. ▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                           ----------------------------
                                     Title: Chief Financial Officer
                                            ---------------------------
                                       22
                                  EXHIBIT A-1
                        OUTLINE AND LOCATION OF PREMISES
         This  Exhibit is  attached  to and made a part of the Lease dated as of
1999, by and between  EOP-SHORELINE  TECHNOLOGY PARK, L.L.C., a Delaware limited
liability  company  ("Landlord")  and  COMMTOUCH  SOFTWARE,  INC.,  a California
corporation ("Tenant") for space in the Building located at ▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇,
▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇. EXHIBIT A-2
                               [Graphic Omitted]
                                  EXHIBIT A-2
                        OUTLINE AND LOCATION OF PROJECT
         This  Exhibit is  attached  to and made a part of the Lease dated as of
October 28,  1999,  by and between  EOP-SHORELINE  TECHNOLOGY  PARK,  L.L.C.,  a
Delaware limited liability company ("Landlord") and COMMTOUCH SOFTWARE,  INC., a
California  corporation  ("Tenant")  for space in the  Building  located at ▇▇▇▇
▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
                               [Graphic Omitted]
                                       2
                                  EXHIBIT A-3
                   OUTLINE AND LOCATION OF RECREATIONAL AREA
         This  Exhibit is  attached  to and made a part of the Lease dated as of
October 28,  1999,  by and between  EOP-SHORELINE  TECHNOLOGY  PARK,  L.L.C.,  a
Delaware limited liability company ("Landlord") and COMMTOUCH SOFTWARE,  INC., a
California  corporation  ("Tenant")  for space in the  Building  located at ▇▇▇▇
▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
                               [Graphic Omitted]
                                       3
                                   EXHIBIT B
                         PROJECT RULES AND REGULATIONS
         The following rules and regulations shall apply,  where applicable,  to
the  Premises,  the Building,  the parking  garage (if any),  the Property,  the
Project  and the  appurtenances.  Capitalized  terms  have the same  meaning  as
defined in the Lease.
1.       Sidewalks,  doorways,  vestibules,  halls,  stairways and other similar
         areas  shall not be  obstructed  by  Tenant  or used by Tenant  for any
         purpose  other than  ingress  and egress to and from the  Premises.  No
         rubbish, litter, trash, or material shall be placed, emptied, or thrown
         in those areas.  At no time shall Tenant permit  Tenant's  employees to
         loiter in Common Areas or  elsewhere  about the  Building,  Property or
         Project.
2.       Plumbing  fixtures and  appliances  shall be used only for the purposes
         for which designed, and no sweepings, rubbish, rags or other unsuitable
         material  shall be  thrown or placed  in the  fixtures  or  appliances.
         Damage  resulting  to fixtures  or  appliances  by Tenant,  its agents,
         employees or invitees,  shall be paid for by Tenant, and Landlord shall
         not be responsible for the damage.
3.       No signs,  advertisements  or  notices  shall be  painted or affixed to
         windows,  doors or other parts of the Building or the  Project,  except
         those of such  color,  size,  style  and in such  places  as are  first
         approved in writing by Landlord.  Except in connection with the hanging
         of lightweight pictures and wall decorations, no nails, hooks or screws
         shall be inserted  into any part of the  Premises,  Building or Project
         except by Landlord's maintenance personnel.
4.       No directory  listing  tenants or employees  shall be permitted  unless
         previously consented to by Landlord in writing.
5.       Tenant  shall  not  place  any  lock(s)  on any  door in the  Premises,
         Building  or Project  without  Landlord's  prior  written  consent  and
         Landlord shall have the right to retain at all times and to use keys to
         all locks within and into the Premises.  A reasonable number of keys to
         the locks on the entry  doors in the  Premises  shall be  furnished  by
         Landlord  to Tenant at  Tenant's  cost,  and Tenant  shall not make any
         duplicate  keys.  All  keys  shall  be  returned  to  Landlord  at  the
         expiration or early termination of this Lease.
6.       All   contractors,   contractor's   representatives   and  installation
         technicians performing work in the Building and/or the Project shall be
         subject to  Landlord's  prior  approval and shall be required to comply
         with Landlord's standard rules,  regulations,  policies and procedures,
         which may be revised from time to time.
7.       Movement  in or out of the  Building  or the  Project of  furniture  or
         office  equipment,  or dispatch or receipt by Tenant of  merchandise or
         materials  requiring  the use of elevators,  stairways,  lobby areas or
         loading  dock  areas,  shall  be  restricted  to  hours  designated  by
         Landlord.  Tenant shall obtain Landlord's prior approval by providing a
         detailed listing of the activity. If approved by Landlord, the activity
         shall be under the  supervision of Landlord and performed in the manner
         required  by  Landlord.  Tenant  shall  assume  all risk for  damage to
         articles  moved and injury to any persons  resulting from the activity.
         If equipment,  property, or personnel of Landlord or of any other party
         is  damaged  or  injured  as a  result  of or in  connection  with  the
         activity,  Tenant shall be solely  liable for any  resulting  damage or
         loss.
8.       Landlord shall have the right to approve the weight,  size, or location
         of heavy equipment or articles in and about the Premises. Damage to the
         Building and/or Project by the  installation,  maintenance,  operation,
         existence or removal of Tenant's Property shall be repaired at Tenant's
         sole expense.
9.       Corridor doors, when not in use, shall be kept closed.
10.      Tenant shall not:  (1) make or permit any  improper,  objectionable  or
         unpleasant  noises or odors in the  Building or Project,  or  otherwise
         interfere in any way with other tenants or persons having business with
         them; (2) solicit  business or distribute,  or cause to be distributed,
         in any  portion of the  Building  or  Project,  handbills,  promotional
         materials  or  other  advertising;  or  (3)  conduct  or  permit  other
         activities in the Building or Project that might,  in  Landlord's  sole
         opinion,  constitute a nuisance.
11.      No  animals,   except  those  assisting  handicapped  persons,  and  no
         aquariums  shall be brought into the Building or the Project or kept in
         or about the Premises.
12.      No inflammable,  explosive or dangerous  fluids or substances  shall be
         used or kept by Tenant in the Premises,  Building, Project or about the
         Property.  Tenant shall not, without  Landlord's prior written consent,
         use, store,  install,  spill, remove,  release or dispose of, within or
         about the Premises or any other portion of the Property or Project, any
         asbestos-containing  materials or any solid, liquid or gaseous material
         now or subsequently  considered toxic or hazardous under the provisions
         of 42 U.S.C. Section 9601 et seq. or any other applicable environmental
         Law which may now or later be in effect.  Tenant  shall comply with all
         Laws  pertaining to and governing the use of these materials by Tenant,
         and shall remain solely liable for the costs of abatement and removal.
13.      Tenant  shall not use or occupy the  Premises  in any manner or for any
         purpose  which  might  injure the  reputation  or impair the present or
         future value of the Premises, the Building or the Project. Tenant shall
         not use, or permit any part of the  Premises to be used,  for  lodging,
         sleeping or for any illegal purpose.
14.      Tenant shall not take any action which would violate  Landlord's  labor
         contracts  or  which  would  cause a work  stoppage,  picketing,  labor
         disruption  or  dispute,  or  interfere  with  Landlord's  or any other
         tenant's or  occupant's  business or with the rights and  privileges of
         any  person  lawfully  in  the  Building  and/or  the  Project  ("Labor
         Disruption").  Tenant  shall take the actions  necessary to resolve the
         Labor Disruption, and shall have pickets removed and, at the request of
         Landlord, immediately terminate any work in the Premises that gave rise
         to the Labor  Disruption,  until Landlord gives its written consent for
         the work to  resume.  Tenant  shall have no claim for  damages  against
         Landlord  or  any  of the  Landlord  Related  Parties,  nor  shall  the
         Commencement  Date of the Term be  extended  as a result  of the  above
         actions.
15.      Tenant shall not install, operate or maintain in the Premises or in any
         other area of the Building or the Project,  electrical  equipment  that
         would  overload the  electrical  system beyond its capacity for proper,
         efficient and safe operation as determined  solely by Landlord.  Tenant
         shall not  furnish  cooling  or  heating  to the  Premises,  including,
         without  limitation,  the use of  electronic  or gas  heating  devices,
         without  Landlord's  prior written  consent.  Tenant shall not use more
         than  its   proportionate   share  of   telephone   lines   and   other
         telecommunication  facilities  available to service the Building and/or
         the Project.
16.      Tenant  shall not  operate  or permit  to be  operated  a coin or token
         operated  vending  machine  or  similar  device   (including,   without
         limitation, telephones, lockers, toilets, scales, amusement devices and
         machines for sale of  beverages,  foods,  candy,  cigarettes  and other
         goods),   except  for  machines  for  the  exclusive  use  of  Tenant's
         employees, and then only if the operation does not violate the lease of
         any other tenant in the Building or the Project.
17.      Bicycles and other vehicles are not permitted inside the Building or on
         the  walkways  outside  the  Building,  except in areas  designated  by
         Landlord.
18.      Landlord  may from time to time adopt  systems and  procedures  for the
         security and safety of the Building the Project,  and their  occupants,
         entry, use and contents.  Tenant, its agents,  employees,  contractors,
         guests  and  invitees   shall  comply  with   Landlord's   systems  and
         procedures.
19.      Landlord  shall have the right to  prohibit  the use of the name of the
         Building  and/or the Project or any other  publicity  by Tenant that in
         Landlord's  sole  opinion  may impair the  reputation  of the  Building
         and/or the  Project or their  desirability.  Upon  written  notice from
         Landlord,  Tenant shall  refrain from and  discontinue  such  publicity
         immediately.
20.      Tenant shall not canvass,  solicit or peddle in or about the  Building,
         the Property or the Project.
21.      Neither  Tenant  nor its  agents,  employees,  contractors,  guests  or
         invitees shall smoke or permit smoking in the Common Areas,  unless the
         Common Areas have been declared a designated  smoking area by Landlord,
         nor shall the above  parties  allow smoke from the  Premises to emanate
         into the Common  Areas or any other part of the  Building  or  Project.
         Landlord shall have the right to designate the Building  (including the
         Premises) and/or the Project as a non-smoking building or area.
22.      Landlord shall have the right to designate and approve  standard window
         coverings  for the Premises  and to establish  rules to assure that the
         Building  and Project  present a uniform  exterior  appearance.  Tenant
         shall  ensure,  to  the  extent  reasonably  practicable,  that  window
         coverings are closed on windows in the Premises  while they are exposed
         to the direct rays of the sun.
23.      Deliveries to and from the Premises shall be made only at the times, in
         the areas and through the entrances  and exits  designated by Landlord.
         Tenant  shall not make  deliveries  to or from the Premises in a manner
         that might  interfere  with the use by any other tenant of its premises
         or of the  Common  Areas,  any  pedestrian  use,  or any use  which  is
         inconsistent with good business practice.
24.      The work of cleaning  personnel  shall not be hindered by Tenant  after
         5:30 P.M.,  and cleaning  work may be done at any time when the offices
         are vacant.  Windows,  doors and  fixtures  may be cleaned at any time.
         Tenant shall provide adequate waste and rubbish  receptacles to prevent
         unreasonable hardship to the cleaning service.
                                   EXHIBIT C
                              COMMENCEMENT LETTER
                                   (EXAMPLE)
Date    _______________________
Tenant  _______________________
Address _______________________
        _______________________
        _______________________
Re:      Commencement  Letter  with  respect to that  certain  Lease dated as of
         _________________,  __, by and between  EOP-SHORELINE  TECHNOLOGY PARK,
         L.L.C.,  a  Delaware  limited  liability  company,  as  Landlord,   and
         COMMTOUCH  SOFTWARE,  INC., a California  corporation,  as Tenant,  for
         71,404  rentable  square feet in the Building  located at ▇▇▇▇ ▇▇▇▇▇▇▇▇
         ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
Dear _______________________:
         In accordance  with the terms and  conditions  of the above  referenced
Lease, Tenant accepts possession of the Premises and agrees:
         1. The Commencement Date of the Lease is _______________________.
         2. The Termination Date of the Lease is _______________________.
         Please  acknowledge  your acceptance of possession and agreement to the
terms set forth above by signing all 3 counterparts of this Commencement  Letter
in the  space  provided  and  returning  2  fully  executed  counterparts  to my
attention.
Sincerely,
_______________________
Property Manager
Agreed and Accepted:
         Tenant:  _______________________
         By:    _______________________
         Name:  _______________________
         Title: _______________________
         Date:  _______________________
                                   EXHIBIT D
                                  WORK LETTER
         This  Exhibit is  attached  to and made a part of the Lease dated as of
October 28,  1999,  by and between  EOP-SHORELlNE  TECHNOLOGY  PARK,  L.L.C.,  a
Delaware limited liability company ("Landlord") and COMMTOUCH SOFTWARE,  INC., a
California  corporation  ("Tenant")  for space in the  Building  located at ▇▇▇▇
▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
I.       Alterations and Allowance.
         A.       Tenant, following the delivery of the Premises by Landlord and
                  the full and final  execution  and  delivery of this Lease and
                  all prepaid rental and security deposits  required  hereunder,
                  shall have the right to perform  alterations and  improvements
                  in the Premises (the "Initial  Alterations").  Notwithstanding
                  the foregoing,  Tenant and its contractors  shall not have the
                  right to perform  Initial  Alterations in the Premises  unless
                  and  until  Tenant  has  complied  with all of the  terms  and
                  conditions of Article IX.C. of this Lease, including,  without
                  limitation,  approval  by  Landlord of the final plans for the
                  Initial  Alterations  and the  contractors  to be  retained by
                  Tenant to perform  such Initial  Alterations.  Tenant shall be
                  responsible  for all elements of the design of Tenant's  plans
                  (including,   without   limitation,   compliance   with   law,
                  functionality  of  design,  the  structural  integrity  of the
                  design, the configuration of the premises and the placement of
                  Tenant's furniture,  appliances and equipment), and Landlord's
                  approval of Tenant's plans shall in no event relieve Tenant of
                  the  responsibility  for such  design.  Tenant  may choose the
                  general contractor that shall perform the Initial  Alterations
                  in the Premises,  subject to Landlord's  approval.  Landlord's
                  approval of the contractors to perform the Initial Alterations
                  shall not be  unreasonably  withheld.  The parties  agree that
                  Landlord's  approval of the general  contractor to perform the
                  Initial Alterations shall not be considered to be unreasonably
                  withheld  if any  such  general  contractor  (i) does not have
                  trade references reasonably acceptable to Landlord,  (ii) does
                  not maintain  insurance  as required  pursuant to the terms of
                  this  Lease,  (iii) does not have the ability to be bonded for
                  the work in an amount of no less than  $500,000.00,  (iv) does
                  not provide current financial statements reasonably acceptable
                  to Landlord,  or (v) is not  licensed as a  contractor  in the
                  state/municipality  in which the  Premises is located.  Tenant
                  acknowledges  the foregoing is not intended to be an exclusive
                  list of the reasons why Landlord may  reasonably  withhold its
                  consent to a general contractor.
         B.       Provided  Tenant  is  not  in  default,   Landlord  agrees  to
                  contribute  the sum of $357,020.00  (i.e.,  $5.00 per rentable
                  square foot of the Premises) (the "Allowance") toward the cost
                  of  performing  the  Initial  Alterations  in  preparation  of
                  Tenant's occupancy of the Premises.  The Allowance may only be
                  used  for  the  cost  of  preparing  design  and  construction
                  documents and mechanical and electrical  plans for the Initial
                  Alterations  and for hard costs in connection with the Initial
                  Alterations.  The  Allowance  shall be paid to  Tenant  or, at
                  Landlord's option, to the order of the general contractor that
                  performed the Initial  Alterations,  within 30 days  following
                  receipt by Landlord of (1) receipted  bills covering all labor
                  and  materials  expended and used in the Initial  Alterations;
                  (2) a sworn contractors  affidavit from the general contractor
                  and a request to disburse  from Tenant  containing an approval
                  by Tenant of the work  done;  (3) full and  final  waivers  of
                  lien; (4) as-built plans of the Initial  Alterations;  and (5)
                  the certification of Tenant and its architect that the Initial
                  Alterations  have  been  installed  in a good and  workmanlike
                  manner  in  accordance  with  the  approved   plans,   and  in
                  accordance with  applicable  laws,  codes and ordinances.  The
                  Allowance  shall be disbursed  in the amount  reflected on the
                  receipted    bills    meeting    the    requirements    above.
                  Notwithstanding  anything  herein  to the  contrary,  Landlord
                  shall  not  be  obligated  to  disburse  any  portion  of  the
                  Allowance  during the  continuance of an uncured default under
                  the Lease,  and  Landlord's  obligation to disburse shall only
                  resume when and if such default is cured.
         C.       In no event shall the  Allowance  be used for the  purchase of
                  equipment,  furniture  or other items of personal  property of
                  Tenant.  In the event Tenant does not use the entire Allowance
                  by the date which is 6 months after the Commencement Date, any
                  unused amount shall accrue to the sole benefit of Landlord, it
                  being  understood  that  Tenant  shall not be  entitled to any
                  credit, abatement or other
                  concession   in   connection   therewith.   Tenant   shall  be
                  responsible  for all applicable  state sales or use taxes,  if
                  any, payable in connection with the Initial Alterations and/or
                  Allowance.
         D.       Tenant agrees to accept the Premises in its "as-is"  condition
                  and configuration,  it being agreed that Landlord shall not be
                  required to perform any work or, except as provided above with
                  respect to the Allowance,  incur any costs in connection  with
                  the  construction  or  demolition of any  improvements  in the
                  Premises.
         E.       This  Exhibit  D  shall  not  be  deemed   applicable  to  any
                  additional space added to the original Premises at any time or
                  from time to time,  whether by any options  under the Lease or
                  otherwise,  or to any portion of the original  Premises or any
                  additions  to  the  Premises  in the  event  of a  renewal  or
                  extension of the original  Term of this Lease,  whether by any
                  options  under the Lease or  otherwise,  unless  expressly  so
                  provided in the Lease or any  amendment or  supplement  to the
                  Lease.
         Landlord and Tenant have  executed  this Exhibit as of the day and year
first above written.
                             LANDLORD:
                             EOP-SHORELINE TECHNOLOGY PARK, L.L.C., a
                             Delaware limited liability company
                             By: EOP Operating Limited Partnership,
                                 a Delaware limited partnership, its sole member
                                 By: Equity Office Properties Trust, a Maryland
                                     real estate investment rust, its managing
                                     general partner
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                           ----------------------------
                                     Title: Senior Vice President
                                            ---------------------------
                             TENANT:
                             COMMTOUCH SOFTWARE, INC., a California
                             corporation
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                           ----------------------------
                                     Title: Chief Financial Officer
                                            ---------------------------
                                     By: /s/ ▇. ▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                           ----------------------------
                                     Title: Chief Executive Officer
                                            ---------------------------
                                   EXHIBIT E
                             ADDITIONAL PROVISIONS
         This  Exhibit  is a ached to and made a part of the  Lease  dated as of
October 28 , 1999,  by and between  EOP-SHORELINE  TECHNOLOGY  PARK,  L.L.C.,  a
Delaware limited liability company ("Landlord") and COMMTOUCH SOFTWARE,  INC., a
California  corporation  ("Tenant")  for space in the  Building  located at ▇▇▇▇
▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
I.       RENEWAL OPTION.
         A.       Tenant  shall have the right to extend the Term (the  "Renewal
                  Option") for one  additional  period of 5 years  commencing on
                  the day following the Termination Date of the initial Term and
                  ending on the 5th  anniversary  of the  Termination  Date (the
                  "Renewal Term"), if:
                  1.       Landlord  receives  notice of exercise of the Renewal
                           Option  ("Initial  Renewal  Notice') not less than 12
                           full calendar  months prior to the  expiration of the
                           initial  Term  and not  more  than  15 full  calendar
                           months prior to the  expiration  of the initial Term;
                           and
                  2.       Tenant is not in default  under the Lease  beyond any
                           applicable  cure  periods  at the  time  that  Tenant
                           delivers  its Initial  Renewal  Notice or at the time
                           Tenant  delivers its Binding  Notice (as  hereinafter
                           defined); and
                  3.       No  part  of  the  Premises  is  sublet  (other  than
                           pursuant  to a Permitted  Transfer)  at the time that
                           Tenant  delivers its Initial Renewal Notice or at the
                           time Tenant delivers its Binding Notice; and
                  4.       The  Lease  has not been  assigned  prior to the date
                           that Tenant  delivers its Initial  Renewal  Notice or
                           prior to the date Tenant delivers its Binding Notice;
                           and
                  5.       Tenant  executes  and returns  the Renewal  Amendment
                           (hereinafter   defined)  within  15  days  after  its
                           submission to Tenant.
         B.       The initial  Base Rent rate per  rentable  square foot for the
                  Premises  during the Renewal  Term shall equal the  Prevailing
                  Market (hereinafter defined) rate per rentable square foot for
                  the Premises.
         C.       Tenant shall pay Additional Rent (i.e. Expenses and Taxes) for
                  the  Premises  during  the  Renewal  Term in  accordance  with
                  Article IV of the Lease.
         D.       Within 30 days  after  receipt  of  Tenant's  Initial  Renewal
                  Notice,  Landlord shall advise Tenant of the  applicable  Base
                  Rent  rate for the  Premises  for the  Renewal  Term.  Tenant,
                  within 15 days after the date on which Landlord advises Tenant
                  of the applicable  Base Rent rate for the Renewal Term,  shall
                  either  (i)  give  Landlord   final  binding   written  notice
                  ("Binding Notice") of Tenant's exercise of its option, or (ii)
                  if Tenant  disagrees with  Landlord's  determination,  provide
                  Landlord  with  written  notice of rejection  (the  "Rejection
                  Notice").  If Tenant fails to provide  Landlord  with either a
                  Binding Notice or Rejection  Notice within such 15 day period,
                  Tenant's  Renewal  Option  shall  be null  and  void and of no
                  further force and effect.  If Tenant provides  Landlord with a
                  Binding  Notice,  Landlord  and  Tenant  shall  enter into the
                  Renewal  Amendment  upon the  terms and  conditions  set forth
                  herein.  If Tenant provides  Landlord with a Rejection Notice,
                  Landlord and Tenant shall work together in good faith to agree
                  upon the  Prevailing  Market  Base Rent rate for the  Premises
                  during the Renewal Term.  Upon agreement  Tenant shall provide
                  Landlord  with  Binding  Notice and  Landlord and Tenant shall
                  enter into the Renewal  Amendment in accordance with the terms
                  and  conditions  hereof.  Notwithstanding  the  foregoing,  if
                  Landlord  and Tenant  are unable to agree upon the  Prevailing
                  Market  Base Rent rate for the  Premises  within 30 days after
                  the date on which Tenant  provides  Landlord  with a Rejection
                  Notice,  Tenant may elect to either  rescind its  intention to
                  renew, or subject the process to binding arbitration. Tenant's
                  election  to  cause  the   disagreement   to  be  resolved  by
                  arbitration  shall be  deemed  to be its  Binding  Notice.  If
                  Tenant   fails  to   require   arbitration   by  notice   (the
                  "Arbitration  Notice")  within 3 days of the expiration of the
                  30 day period set forth  above,  Tenant's  right to extend the
                  Lease  shall  be null and void  and of no  further  force  and
                  effect.
                  If  Tenant  provides  Landlord  with  an  Arbitration  Notice,
                  Landlord  and  Tenant,  within  10 days  after the date of the
                  Arbitration Notice,  shall each  simultaneously  submit to the
                  other,  in a sealed  envelope,  its good faith estimate of the
                  Prevailing  Market  rate  (collectively  referred  to  as  the
                  "Estimates"). If the higher of such Estimates is not more than
                  105% of the lower of such Estimates,  then  Prevailing  Market
                  rate  shall  be the  average  of  the  two  Estimates.  If the
                  Prevailing  Market  rate is not  resolved  by the  exchange of
                  Estimates,  Landlord  and  Tenant,  within  7 days  after  the
                  exchange  of  Estimates,  shall each  select an  appraiser  to
                  determine which of the two Estimates most closely reflects the
                  Prevailing  Market  rate for the  Premises  during the Renewal
                  Term.  Each appraiser so selected shall be certified as an MAI
                  appraiser or as an ASA appraiser and shall have had at least 5
                  years experience within the previous 10 years as a real estate
                  appraiser working in the Mountain View,  California area, with
                  working  knowledge of current rental rates and practices.  For
                  purposes of this Lease, an "MAI" appraiser means an individual
                  who  holds  an  MAI  designation   conferred  by,  and  is  an
                  independent  member of, the American  Institute of Real Estate
                  Appraisers  (or its  successor  organization,  or in the event
                  there  is no  successor  organization,  the  organization  and
                  designation  most similar),  and an "ASA"  appraiser  means an
                  individual who holds the Senior Member  designation  conferred
                  by, and is an independent  member of, the American  Society of
                  Appraisers  (or its successor  organization,  or, in the event
                  there  is no  successor  organization,  the  organization  and
                  designation  most  similar).  Upon  selection,  Landlord's and
                  Tenant's appraisers shall work together in good faith to agree
                  upon which of the two  Estimates  most  closely  reflects  the
                  Prevailing  Market  rate for the  Premises  during the Renewal
                  Term. The Estimate chosen by such appraisers  shall be binding
                  on both  Landlord  and  Tenant  as the Base  Rent rate for the
                  Premises during the Renewal Term. If either Landlord or Tenant
                  fails to  appoint  an  appraiser  within  the seven day period
                  referred to above, the appraiser  appointed by the other party
                  shall be the sole  appraiser for the purposes  hereof.  If the
                  two  appraisers  cannot agree upon which of the two  Estimates
                  most closely reflects the Prevailing Market within the 20 days
                  after  their  appointment,  then,  within  10 days  after  the
                  expiration  of  such 20 day  period,  the 2  appraisers  shall
                  select a third appraiser meeting the aforementioned  criteria.
                  Once the third  appraiser  has been  selected as provided  for
                  above, then, as soon thereafter as practicable but in any case
                  within  14  days,   the  third   appraiser   shall   make  his
                  determination  of  which  of the two  Estimates  most  closely
                  reflects the Prevailing Market rate and such Estimate shall be
                  binding on both  Landlord and Tenant as the Base Rent rate for
                  the Premises  during the Renewal Term. If the third  appraiser
                  believes  that expert advice would  materially  assist him, he
                  may  retain one or more  qualified  persons,  to provide  such
                  expert advice. The parties shall share equally in the costs of
                  the third  appraiser and of any experts  retained by the third
                  appraiser.  Any  fees of any  appraiser,  counsel  or  experts
                  engaged  directly  by Landlord  or Tenant,  however,  shall be
                  borne  by the  party  retaining  such  appraiser,  counsel  or
                  expert.  In the event that the Prevailing  Market rate has not
                  been determined by the commencement  date of the Renewal Term,
                  Tenant  shall pay Base Rent upon the terms and  conditions  in
                  effect for  initial  Term  until  such time as the  Prevailing
                  Market rate has been determined. Upon such determination,  the
                  Base Rent for the  Premises  during the Renewal  Term shall be
                  retroactively  adjusted  to the  commencement  of the  Renewal
                  Term. If such  adjustment  results in an  underpayment of Base
                  Rent by Tenant,  Tenant  shall pay Landlord the amount of such
                  underpayment  within 30 days after the determination  thereof.
                  If such  adjustment  results in an overpayment of Base Rent by
                  Tenant,  Landlord  shall credit such  overpayment  against the
                  next  installment of Base Rent due under the Lease and, to the
                  extent necessary, any subsequent installments until the entire
                  amount of such  overpayment  has been  credited  against  Base
                  Rent.
         E.       If Tenant is entitled to and  properly  exercises  its Renewal
                  Option,  Landlord  shall  prepare an amendment  (the  "Renewal
                  Amendment")  to  reflect  changes  in  the  Base  Rent,  Term,
                  Termination  Date and other  appropriate  terms.  The  Renewal
                  Amendment shall be:
                  1.       sent to Tenant within a reasonable time after receipt
                           of the Binding Notice;  and
                  2.       executed  by  Tenant  and  returned  to  Landlord  in
                           accordance with Paragraph A.5. above.
                  An otherwise  valid exercise of the Renewal  Option shall,  at
                  Landlord's  option,  be  fully  effective  whether  or not the
                  Renewal Amendment is executed.
         F.       In the event a Capital  Improvement  Expense is  incurred  and
                  Landlord  has had to pay a portion of the Capital  Improvement
                  Expense  because the number of Remaining  Years (as originally
                  determined  at the time the  Capital  Improvement  Expense was
                  incurred)  during the  initial  Term of the Lease is less than
                  the lesser of (a) the  number of years of the  useful  life of
                  the applicable capital  improvement (as reasonably  determined
                  by  Landlord)  and (b) 10  years,  then  Tenant  shall  pay to
                  Landlord,  on or before the  commencement  date of the Renewal
                  Term, as Additional  Rent due under the Lease, an amount equal
                  to (x) the  total  cost  of the  Capital  Improvement  Expense
                  divided by the lesser of (a) and (b) above,  multiplied by (y)
                  the difference  between the lesser of (a) or (b) above and the
                  Remaining  Years  (as  originally  determined  at the time the
                  Capital Improvement Expense was incurred).
         G.       For purpose hereof,  "Prevailing Market" shall mean the annual
                  rental rate per rentable  square foot under renewal leases and
                  amendments  entered  into on or about  the  date on which  the
                  Prevailing  Market  is being  determined  hereunder  for space
                  comparable to the Premises in the Project.  The  determination
                  of  Prevailing  Market  shall take into  account any  material
                  economic  differences  between the terms of this Lease and any
                  comparison lease, such as rent abatements,  construction costs
                  and other  concessions  and the  manner,  if any, in which the
                  Landlord  under any such  lease is  reimbursed  for  operating
                  expenses and taxes.  The  determination  of Prevailing  Market
                  shall also take into consideration any reasonably  anticipated
                  changes  in the  Prevailing  Market  rate  from the time  such
                  Prevailing  Market rate is being  determined and the time such
                  Prevailing Market rate will become effective under this Lease.
         H.       Landlord  and  Tenant  acknowledge  and  agree  that  Tenant's
                  Renewal  Option is  personal  to  Tenant  only and in no event
                  shall Tenant's Renewal Option be assignable or transferable.
         IN WITNESS  WHEREOF,  Landlord and Tenant have executed this Exhibit as
of the day and year first above written.
                             LANDLORD:
                             EOP-SHORELINE TECHNOLOGY PARK, L.L.C., a
                             Delaware limited liability company
                             By: EOP Operating Limited Partnership,
                                 a Delaware limited partnership, its sole member
                                 By: Equity Office Properties Trust, a Maryland
                                     real estate investment rust, its managing
                                     general partner
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                           ----------------------------
                                     Title: Senior Vice President
                                            ---------------------------
                             TENANT:
                             COMMTOUCH SOFTWARE, INC., a California
                             corporation
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                           ----------------------------
                                     Title: CFO
                                            ---------------------------
                                     By: /s/ ▇. ▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                           ----------------------------
                                     Title: CEO
                                            ---------------------------
                                   EXHIBIT F
                               PARKING AGREEMENT
         This  Exhibit is  attached  to and made a part of the Lease dated as of
October 28,  1999,  by and between  EOP-SHORELINE  TECHNOLOGY  PARK,  L.L.C.,  a
Delaware limited liability company (`Landlord") and COMMTOUCH SOFTWARE,  INC., a
California  corporation  (`Tenant")  for space in the  Building  located at ▇▇▇▇
▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇.
1.       Landlord  hereby  grants to Tenant and persons  designated  by Tenant a
         license to use 264  non-priority  parking  spaces in the parking  areas
         ("Parking Facility")  servicing the Building.  The term of such license
         shall  commence  on the  Commencement  Date  under  the Lease and shall
         continue until the earlier to occur of the  Termination  Date under the
         Lease, the sooner termination of the Lease, or Tenant's  abandonment of
         the Premises thereunder.
2.       Tenant shall at all times comply with all applicable ordinances, rules,
         regulations,  codes,  laws,  statutes and  requirements of all federal,
         state,  county and municipal  governmental bodies or their subdivisions
         respecting the use of the Parking Facility. Landlord reserves the right
         to adopt,  modify and enforce reasonable rules ("Rules")  governing the
         use of the Parking  Facility from time to time  including any key-card,
         sticker  or  other  identification  or  entrance  system  and  hours of
         operation. The rules set forth herein are currently in effect. Landlord
         may refuse to permit any person who violates  such rules to park in the
         Parking Facility,  and any violation of the rules shall subject the car
         to removal from the Parking Facility.
3.       Unless  specified to the contrary above,  the parking spaces  hereunder
         shall be provided on a non-designated "first-come, first-served" basis.
         Tenant  acknowledges  that Landlord has no liability for claims arising
         through acts or omissions of any Operator (as  hereinafter  defined) of
         the  Parking  Facility,  if  any.  Landlord  shall  have  no  liability
         whatsoever for any damage to items located in the Parking Facility, nor
         for any personal  injuries or death arising out of any matter  relating
         to the Parking Facility, and in all events, Tenant agrees to look first
         to its insurance  carrier and to require that Tenant's  employees  look
         first to their respective  insurance carriers for payment of any losses
         sustained in connection  with any use of the Parking  Facility.  Tenant
         shall cause its insurance  carriers to waive all rights of  subrogation
         against Landlord or Landlord's  agents.  Landlord reserves the right to
         assign  specific  parking  spaces,  and to reserve  parking  spaces for
         visitors, small cars, handicapped persons and for other tenants, guests
         of tenants or other parties, which assignment and reservation or spaces
         may be  relocated  as  determined  by Landlord  from time to time,  and
         Tenant and persons designated by Tenant hereunder shall not park in any
         location  designated  for such  assigned  or reserved  parking  spaces.
         Tenant acknowledges that the Parking Facility may be closed entirely or
         in part in order to make repairs or perform maintenance services, or to
         alter,  modify,  re-stripe  or  renovate  the Parking  Facility,  or if
         required by casualty,  strike,  condemnation,  act of God, governmental
         law or  requirement  or other reason beyond the  operator's  reasonable
         control.
4.       If Tenant shall default under this Parking  Agreement,  the Landlord or
         the  Operator,  as the case may be, shall have the right to remove from
         the  Parking  Facility  any  vehicles  hereunder  which shall have been
         involved  or shall  have been owned or driven by  parties  involved  in
         causing  such  default,  without  liability  therefor  whatsoever.   In
         addition,  if  Tenant  shall  default  under  this  Parking  Agreement,
         Landlord  shall have the right to cancel this  Parking  Agreement on 30
         days' written  notice,  unless within such 30 day period,  Tenant cures
         such default.  However,  if Tenant's default cannot reasonably be cured
         within 30 days, Tenant shall be allowed  additional time (not to exceed
         60 days,  subject to extension  due to Force  Majeure) as is reasonably
         necessary to cure such default, so long as (1) Tenant commences to cure
         the default within 30 days, and (2) Tenant diligently  pursues a course
         of action  that  will  cure the  default  and  bring  the  Tenant  into
         compliance  with  the  Lease  and this  Parking  Agreement.  If  Tenant
         defaults with respect to the same term or condition  under this Parking
         Agreement  more than 6 times during any 12 month  period,  and Landlord
         notifies  Tenant  thereof  promptly  after each such default,  the next
         default  of such  term or  condition  during  the  succeeding  12 month
         period, shall, at Landlord's election, constitute an incurable default.
         Such  cancellation  right  shall be  cumulative  and in addition to any
         other  rights or remedies  available  to Landlord at law or equity,  or
         provided  under the Lease (all of which rights and  remedies  under the
         Lease are hereby  incorporated  herein, as though fully set forth). Any
         default by Tenant under the Lease shall be a default under this Parking
         Agreement,  and any default  under this  Parking  Agreement  shall be a
         default under the Lease.
                                      RULES
         (i)      Tenant shall have access to the Parking  Facility on a 24 hour
                  basis,  7 days a week.  Tenant  shall not store or permit  its
                  employees  to store any  automobiles  in the Parking  Facility
                  without the prior written consent of the Landlord.  Except for
                  emergency repairs,  Tenant and its employees shall not perform
                  any  work on any  automobiles  while  located  in the  Parking
                  Facility, or on the Property. If it is necessary for Tenant or
                  its employees to leave an  automobile in the Parking  Facility
                  overnight, Tenant shall provide the Landlord with prior notice
                  thereof designating the license plate number and model of such
                  automobile.
         (ii)     Cars must be parked entirely within the stall lines painted on
                  the floor, and only small cars may be parked in areas reserved
                  for small cars.
         (iii)    All directional signs and arrows must be observed.
         (iv)     The speed limit shall be 5 miles per hour.
         (v)      Parking spaces reserved for  handicapped  persons must be used
                  only by vehicles properly designated.
         (vi)     Parking is prohibited  in all areas not  expressly  designated
                  for parking, including without limitation:
                  (a)      Areas not striped for parking
                  (b)      aisles
                  (c)      where "no parking" signs are posted
                  (d)      ramps
                  (e)      loading zones
         (vii)    Parking  stickers,  key cards or any other devices or forms of
                  identification  or  entry  supplied  by  the  Landlord  or the
                  Operator, as the case may be, shall remain the property of the
                  Landlord or the  Operator.  Such device must be  displayed  as
                  requested  and may not be mutilated in any manner.  The serial
                  number  of  the  parking  identification  device  may  not  be
                  obliterated.  Parking passes and devices are not  transferable
                  and any pass or device in the  possession  of an  unauthorized
                  holder will be void.
         (viii)   INTENTIONALLY OMITTED.
         (ix)     Parking Facility  managers or attendants are not authorized to
                  make or allow any exceptions to these Rules.
         (x)      Every ▇▇▇▇▇▇ is required to park and lock his/her own car.
         (xi)     Loss or theft of parking  pass,  identification,  key cards or
                  other such  devices  must be reported  to Landlord  and to the
                  Parking  Facility  manager  immediately.  Any parking  devices
                  reported  lost or stolen found on any  authorized  car will be
                  confiscated   and  the  illegal  holder  will  be  subject  to
                  prosecution. Lost or stolen passes and devices found by Tenant
                  or its employees  must be reported to the office of the garage
                  immediately.
         (xii)    Washing,  waxing,  cleaning or servicing of any vehicle by the
                  customer  and/or his agents is prohibited.  Parking spaces may
                  be used only for parking automobiles.
         (xiii)   By signing this Parking  Agreement,  Tenant agrees to acquaint
                  all persons to whom Tenant  assigns a parking  pass with these
                  Rules.
5.       Landlord may elect to provide  parking cards or keys to control  access
         to the  Parking  Facility  or surface  parking  areas,  if any. In such
         event,  Landlord  shall  provide  Tenant  with one card or key for each
         parking  space that  Tenant is  entitled to  hereunder,  provided  that
         Landlord  shall have the right to require  Tenant or its  employees  to
         place a deposit on such  access  cards or keys and to pay a fee for any
         lost or damaged cards or keys.
6.       Landlord hereby reserves the right to enter into a management agreement
         or lease with an entity for the Parking Facility ("Operator").  In such
         event,  Tenant  upon  request of  Landlord,  shall enter into a parking
         agreement  with the Operator  and pay the  Operator the monthly  charge
         established hereunder,  and Landlord shall have no liability for claims
         arising  through acts or omissions  of the  Operator  unless  caused by
         Landlord's  negligence  or willful  misconduct.  It is  understood  and
         agreed that the  identity of the  Operator may change from time to time
         during the Lease Term.  In connection  therewith,  any parking lease or
         agreement  entered into between  Tenant and an Operator shall be freely
         assignable by such Operator or any successors thereto.
7.       NO  LIABILITY.  TENANT  ACKNOWLEDGES  AND AGREES  THAT,  TO THE FULLEST
         EXTENT PERMITTED BY LAW, LANDLORD SHALL NOT BE RESPONSIBLE FOR ANY LOSS
         OR  DAMAGE  TO  TENANT  OR   TENANTS   PROPERTY   (INCLUDING,   WITHOUT
         LIMITATIONS,  ANY LOSS OR DAMAGE TO TENANTS  AUTOMOBILE OR THE CONTENTS
         THEREOF DUE TO THEFT, VANDALISM OR ACCIDENT) ARISING FROM OR RELATED TO
         TENANTS  USE OF THE PARKING  FACILITY  OR EXERCISE OF ANY RIGHTS  UNDER
         THIS PARKING AGREEMENT, WHETHER OR NOT SUCH LOSS OR DAMAGE RESULTS FROM
         LANDLORD'S ACTIVE NEGLIGENCE OR NEGLIGENT  OMISSION.  THE LIMITATION ON
         LANDLORD'S  LIABILITY  UNDER  THE  PRECEDING  SENTENCE  SHALL NOT APPLY
         HOWEVER  TO LOSS OR  DAMAGE  ARISING  DIRECTLY  FROM  LANDLORD'S  GROSS
         NEGLIGENCE OR WILLFUL MISCONDUCT.
8.       Release of Liability.  Without  limiting the  provisions of Paragraph 8
         above,  Tenant  hereby  voluntarily  releases,  discharges,  waives and
         relinquishes  any and all  actions  or causes of  action  for  personal
         injury or property  damage  occurring to Tenant  arising as a result of
         parking in the Parking Facility,  or any activities incidental thereto,
         wherever or however the same may occur,  and further agrees that Tenant
         will not  prosecute  any claim for personal  injury or property  damage
         against Landlord or any of its officers,  agents, servants or employees
         for any said causes of action.  It is the  intention  of Tenant by this
         instrument,  to exempt and relieve Landlord from liability for personal
         injury or property damage unless caused by Landlord's  gross negligence
         or willful misconduct.
9.       The provisions of Article XXI of the Lease are hereby  incorporated  by
         reference as if fully recited.
         Tenant acknowledges that Tenant has read the provisions of this Parking
Agreement,  has been  fully and  completely  advised  of the  potential  dangers
incidental  to parking in the Parking  Facility  and is fully aware of the legal
consequences of signing this instrument.
         IN WITNESS  WHEREOF,  Landlord and Tenant have executed this Exhibit as
of the day and year first above written.
                             LANDLORD:
                             EOP-SHORELINE TECHNOLOGY PARK, L.L.C., a
                             Delaware limited liability company
                             By: EOP Operating Limited Partnership,
                                 a Delaware limited partnership, its sole member
                                 By: Equity Office Properties Trust, a Maryland
                                     real estate investment rust, its managing
                                     general partner
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇
                                           ----------------------------
                                     Title: Senior Vice President
                                            ---------------------------
                             TENANT:
                             COMMTOUCH SOFTWARE, INC., a California
                             corporation
                                     By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
                                           ----------------------------
                                     Title: CFO
                                            ---------------------------
                                     By: /s/ ▇. ▇▇▇▇▇▇
                                         ------------------------------
                                     Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                           ----------------------------
                                     Title: CEO
                                            ---------------------------
EFFECTIVE DATE OF REDUCTION               NEW REDUCED AMOUNT OF LETTER OF CREDIT
MARCH 1, 2001                             US$975,000.00
MARCH 1, 2002                             US$850,000.00
MARCH 1, 2003                             US$725,000.00
MARCH 1, 2004                             US$600,000.00
MARCH 1, 2005                             US$492,687.68
THIS LETTER OF CREDIT SHALL BE AUTOMATICALLY  EXTENDED FOR AN ADDITIONAL  PERIOD
OF ONE YEAR, WITHOUT AMENDMENT,  FROM THE PRESENT OR EACH FUTURE EXPIRATION DATE
BUT IN ANY EVENT NOT BEYOND AUGUST 15, 2007, WHICH SHALL BE THE FINAL EXPIRATION
DATE OF THIS LETTER OF CREDIT,  UNLESS,  AT LEAST 60 DAYS PRIOR TO THEN  CURRENT
EXPIRATION  DATE WE NOTIFY YOU BY REGISTERED  MAIL/OVERNIGHT  COURIER SERVICE AT
THE ABOVE ADDRESS WITH A COPY OF SUCH NOTICE TO: EQUITY OFFICE PROPERTIES TRUST,
▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇,  ATTENTION:  SENIOR VICE
PRESIDENT-TREASURER,  THAT THIS LETTER OF CREDIT WILL NOT BE EXTENDED BEYOND THE
CURRENT  EXPIRATION  DATE.  UPON  RECEIPT OF SUCH NOTICE YOU MAY DRAW YOUR SIGHT
DRAFT DRAWN ON US FOR THE AVAILABLE  AMOUNT UNDER THIS STANDBY  LETTER OF CREDIT
ACCOMPANIED BY YOUR DATED STATEMENT  SIGNED BY ONE OF YOUR AUTHORIZED  OFFICERS,
FOLLOWED BY THEIR DESIGNATED TITLE, CERTIFYING THE FOLLOWING: "WE ARE IN RECEIPT
OF YOUR  NOTICE  THAT YOU HAVE  ELECTED  NOT TO RENEW YOUR  IRREVOCABLE  STANDBY
LETTER OF CREDIT NO.  _____________________  AND APPLICANT HAS FAILED TO PROVIDE
US WITH AN  ACCEPTABLE  SUBSTITUTE  IRREVOCABLE  STANDBY  LETTER  OF  CREDIT  IN
ACCORDANCE WITH THE TERMS OF THE ABOVE REFERENCED LEASE."
THIS  LETTER OF CREDIT MAY ONLY BE  TRANSFERRED  IN ITS  ENTIRETY BY THE ISSUING
BANK UPON OUR RECEIPT OF THE ATTACHED "EXHIBIT A" DULY COMPLETED AND EXECUTED BY
THE  BENEFICIARY  AND  ACCOMPANIED  BY THE  ORIGINAL  LETTER OF  CREDIT  AND ALL
AMENDMENT(S), IF ANY, AND OUR TRANSFER FEE OF 1/4 OF 1% (MIN. $250.00).
DRAFT(S)  AND  DOCUMENTS  MUST  INDICATE  THE NUMBER AND DATE OF THIS  LETTER OF
CREDIT.
DOCUMENTS  MUST  BE  FORWARDED  TO US BY  OVERNIGHT  DELIVERY  SERVICE  OR  HAND
DELIVERED TO: SILICON  VALLEY BANK,  ▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇,  ▇▇▇▇▇ ▇▇▇▇▇,  ▇▇ ▇▇▇▇▇,
ATTN: INTERNATIONAL DIVISION.
WE HEREBY AGREE WITH THE DRAWERS, ENDORSERS AND BONAFIDE HOLDERS THAT THE DRAFTS
DRAWN UNDER AND IN ACCORDANCE WITH THE TERMS AND CONDITIONS OF THIS CREDIT SHALL
BE DULY HONORED UPON  PRESENTATION TO THE DRAWEE, IF NEGOTIATED ON OR BEFORE THE
EXPIRATION DATE OF THIS CREDIT.
THIS  CREDIT IS SUBJECT TO THE  UNIFORM  CUSTOMS AND  PRACTICE  FOR  DOCUMENTARY
CREDITS (1993 REVISION), INTERNATIONAL CHAMBER OF COMMERCE, PUBLICATION NO. 500.
____________________________________        ____________________________________
AUTHORIZED SIGNATURE                        AUTHORIZED SIGNATURE
                                     RULES
         (i)      Tenant shall have access to the Parking  Facility on a 24 hour
                  basis,  7 days a week.  Tenant  shall not store or permit  its
                  employees  to store any  automobiles  in the Parking  Facility
                  without the prior written consent of the Landlord.  Except for
                  emergency repairs,  Tenant and its employees shall not perform
                  any  work on any  automobiles  while  located  in the  Parking
                  Facility, or on the Property. If it is necessary for Tenant or
                  its employees to leave an  automobile in the Parking  Facility
                  overnight, Tenant shall provide the Landlord with prior notice
                  thereof designating the license plate number and model of such
                  automobile.
         (ii)     Cars must be parked entirely within the stall lines painted on
                  the floor, and only small cars may be parked in areas reserved
                  for small cars.
         (iii)    All directional signs and arrows must be observed.
         (iv)     The speed limit shall be 5 miles per hour.
         (v)      Parking spaces reserved for  handicapped  persons must be used
                  only by vehicles properly designated.
         (vi)     Parking is prohibited  in all areas not  expressly  designated
                  for parking, including without limitation:
                  (a)      Areas not striped for parking
                  (b)      aisles
                  (c)      where "no parking' signs are posted
                  (d)      ramps
                  (e)      loading zones
         (vii)    Parking  stickers,  key cards or any other devices or forms of
                  identification  or  entry  supplied  by  the  Landlord  or the
                  Operator, as the case may be, shall remain the property of the
                  Landlord or the  Operator.  Such device must be  displayed  as
                  requested  and may not be mutilated in any manner.  The serial
                  number  of  the  parking  identification  device  may  not  be
                  obliterated.  Parking passes and devices are not  transferable
                  and any pass or device in the  possession  of an  unauthorized
                  holder will be void.
         (viii)   INTENTIONALLY OMITTED.
         (ix)     Parking Facility  managers or attendants are not authorized to
                  make or allow any exceptions to these Rules.
         (x)      Every ▇▇▇▇▇▇ is required to park and lock his/her own car.
         (xi)     Loss or theft of parking  pass,  identification,  key cards or
                  other such  devices  must be reported  to Landlord  and to the
                  Parking  Facility  manager  immediately.  Any parking  devices
                  reported  lost or stolen found on any  authorized  car will be
                  confiscated   and  the  illegal  holder  will  be  subject  to
                  prosecution. Lost or stolen passes and devices found by Tenant
                  or its employees  must be reported to the office of the garage
                  immediately.
         (xii)    Washing,  waxing,  cleaning or servicing of any vehicle by the
                  customer  and/or his agents is prohibited.  Parking spaces may
                  be used only for parking automobiles.
         (xiii)   By signing this Parking  Agreement,  Tenant agrees to acquaint
                  all persons to whom Tenant  assigns a parking  pass with these
                  Rules.
5.       Landlord may elect to provide  parking cards or keys to control  access
         to the  Parking  Facility  or surface  parking  areas,  if any. In such
         event,  Landlord  shall  provide  Tenant  with one card or key for each
         parking  space that  Tenant is  entitled to  hereunder,  provided  that
         Landlord  shall have the right to require  Tenant or its  employees  to
         place a deposit on such  access  cards or keys and to pay a fee for any
         lost or damaged cards or keys.
         0.       "Law(s)" means all  applicable  statutes,  codes,  ordinances,
                  orders, rules and regulations of any municipal or governmental
                  entity.
         P.       "Normal  Business Hours" for the Building are 8 A.M. to 5 P.M.
                  on Business Days.
         Q.       "Property,,  means the Building  and the  parcel(s) of land on
                  which  it  is  located  and,  at  Landlord's  discretion,  the
                  Building's  parking  area and other  improvements  serving the
                  Building,  if any, and the parcel(s) of land on which they are
                  located.
         R.       "Project" shall mean the development  located on approximately
                  51.83 acres commonly  described as Shoreline  Technology Park,
                  which  includes the Building,  the Property,  as well as other
                  buildings  and  property as  outlined on Exhibit A-2  attached
                  hereto and incorporated herein.
         S.       "Rentable  Square  Footage  of the  Project"  is  deemed to be
                  726,508 square feet.
II.      Lease Grant.
         Landlord  leases the Premises to Tenant and Tenant  leases the Premises
from Landlord, together with the right in common with others to use any portions
of the Project that are designated by Landlord for the common use of tenants and
others, such as sidewalks,  unreserved parking areas, common corridors, elevator
foyers, restrooms, vending areas, lobby areas, artificial lakes, walkways, water
amenities,   landscaping,   plaza,  roads,   driveways,   and  recreation  areas
(collectively,  the "Common  Areas"),  including but not limited to that certain
recreation area (the "Recreational Area") which is maintained by Landlord in the
location and configuration shown on Exhibit A-3 attached hereto. Notwithstanding
the foregoing to the contrary, Tenant's right to use the Recreational Area shall
be subject to the right of the City of Mountain  View ("City") to require that a
portion of the  Recreational  Area be paved and used for  parking  purposes at a
time to be  determined at the  discretion  of the City.  The area to be used for
parking purposes is indicated as "Potential Parking Area" on Exhibit A-3. If the
City requires the parking,  Tenant shall have the non-exclusive right to use the
parking spaces created thereby.
III.     Possession.
         A.       Intentionally Omitted.
         B.       Subject to Landlord's obligation,  if any, to perform Landlord
                  Work and  Landlord's  obligations  under  Section  IX.B.,  the
                  Premises  are  accepted  by  Tenant in "as is"  condition  and
                  configuration.  By taking  possession of the Premises,  Tenant
                  agrees that the  Premises  are in good order and  satisfactory
                  condition, and that there are no representations or warranties
                  by Landlord  regarding  the  condition  of the Premises or the
                  Building.  If Landlord is delayed delivering possession of the
                  Premises  or any other  space due to the  holdover or unlawful
                  possession  of such  space by any  party,  Landlord  shall use
                  reasonable  efforts to obtain possession of the space. In such
                  event, the Commencement Date shall be postponed until the date
                  Landlord  delivers  possession  of the Premises to Tenant free
                  from occupancy by any party, and the Termination  Date, at the
                  option of  Landlord,  may be  postponed  by an equal number of
                  days.  In the event  the  Commencement  Date is so  postponed,
                  Landlord  and Tenant  shall enter into a  commencement  letter
                  agreement in the form  attached as Exhibit C.  Notwithstanding
                  the foregoing,  if there have been no delays caused by Tenant,
                  and Landlord has not  tendered  possession  of the Premises to
                  Tenant  by July  1,  2000  (the  "Outside  Possession  Date"),
                  Tenant, as its sole remedy, may terminate this Lease by giving
                  Landlord  written  notice  of  termination  on or  before  the
                  earlier  to occur of: (i) 5  Business  Days after the  Outside
                  Possession  Date;  and (ii)  the  Commencement  Date.  In such
                  event,  this  Lease  shall be  deemed  null and void and of no
                  further force and effect and Landlord  shall  promptly  refund
                  any Prepaid Rental and Security Deposit previously advanced by
                  Tenant  under  this  Lease  and,  so  long as  Tenant  has not
                  previously  defaulted under any of its  obligations  under the
                  Work  Letter,   the  parties  hereto  shall  have  no  further
                  responsibilities  or obligations to each other with respect to
                  this Lease.  Landlord and Tenant  acknowledge  and agree that:
                  (i) the determination of the Commencement Date shall take into
                  consideration the effect of any delays by
                                       3
                  Landlord for compliance, review and appeal of tax liabilities.
                  Without  limitation,  Taxes  shall  not  include  any  income,
                  capital  levy,  franchise,  capital  stock,  gift,  estate  or
                  inheritance  tax. If an assessment is payable in installments,
                  Taxes for the year shall include the amount of the installment
                  and any  interest  due and payable  during that year.  For all
                  other  real  estate  taxes,  Taxes  for that  year  shall,  at
                  Landlord's  election,   include  either  the  amount  accrued,
                  assessed or  otherwise  imposed for the year or the amount due
                  and payable for that year,  provided that Landlord's  election
                  shall be applied consistently throughout the Term. If a change
                  in Taxes is obtained for any year of the Term,  then Taxes for
                  that year will be  retroactively  adjusted and Landlord  shall
                  provide Tenant with a credit, if any, based on the adjustment.
                  Tenant  shall be  responsible  for,  and  shall  pay  prior to
                  delinquency,  taxes or governmental  service fees,  possessory
                  interest  taxes,  fees or charges  in lieu of any such  taxes,
                  capital  levies,  or other charges  imposed upon,  levied with
                  respect to, or assessed against,  its personal  property,  and
                  its  interest  pursuant to this Lease.  To the extent that any
                  such taxes are not  separately  assessed  or billed to Tenant,
                  Tenant  shall pay the amount  thereof as invoiced to Tenant by
                  Landlord prior to the  delinquency of such taxes. In the event
                  that the tenant  improvements in the Building which correspond
                  to the  Initial  Alterations,  as defined in this  Lease,  are
                  assessed  and  taxed  separately  by  the  applicable   taxing
                  authority,  then  Tenant  shall be  liable  and shall pay that
                  portion of the Taxes  applicable  to the value of the  Initial
                  Alterations  in the  Premises  based on the  value  attributed
                  thereto by the applicable  taxing  authority to either (a) the
                  applicable  taxing  authority prior to the delinquency of such
                  taxes in the event  Tenant is billed  directly  by such taxing
                  authority,  or (b) the Landlord  within 30 days after  written
                  demand,  in the  event  Landlord  is  billed  directly  by the
                  applicable taxing authority.
         E.       Audit  Rights.  Tenant  may,  within 90 days  after  receiving
                  Landlord's statement of Expenses, give Landlord written notice
                  ("Review  Notice")  that Tenant  intends to review  Landlord's
                  records  of the  Expenses  for that  calendar  year.  Within a
                  reasonable  time after receipt of the Review Notice,  Landlord
                  shall make all pertinent records available for inspection that
                  are reasonably  necessary for Tenant to conduct its review. If
                  any records are maintained at a location other than the office
                  of the Project,  Tenant may either inspect the records at such
                  other location or pay for the  reasonable  cost of copying and
                  shipping  the  records.  If Tenant  retains an agent to review
                  Landlord's  records,  the agent  must be with a  licensed  CPA
                  firm.  Tenant  shall  be  solely  responsible  for all  costs,
                  expenses and fees incurred for the audit. Within 60 days after
                  the records are made  available  to Tenant,  Tenant shall have
                  the  right to give  Landlord  written  notice  (an  "Objection
                  Notice")  stating  in  reasonable   detail  any  objection  to
                  Landlord's  statement  of  Expenses  for that year.  If Tenant
                  fails to give  Landlord an Objection  Notice within the 60 day
                  period  or  fails to  provide  Landlord  with a Review  Notice
                  within  the 90 day period  described  above,  Tenant  shall be
                  deemed to have approved  Landlord's  statement of Expenses and
                  shall be barred from raising any claims regarding the Expenses
                  for that  year.  If  Tenant  provides  Landlord  with a timely
                  Objection  Notice,  Landlord and Tenant shall work together in
                  good faith to resolve any issues raised in Tenant's  Objection
                  Notice. If Landlord and Tenant determine that Expenses for the
                  calendar year are less than  reported,  Landlord shall provide
                  Tenant with a credit  against the next  installment of Rent in
                  the amount of the overpayment by Tenant. Likewise, if Landlord
                  and Tenant  determine  that Expenses for the calendar year are
                  greater than reported, Tenant shall pay Landlord the amount of
                  any underpayment within 30 days. In addition,  if Landlord and
                  Tenant  determine  that Expenses for the Building for the year
                  in question  were less than stated by more than 5%,  Landlord,
                  within 30 days  after its  receipt of paid  invoices  therefor
                  from Tenant, shall reimburse Tenant for any reasonable amounts
                  paid by Tenant to third parties in connection with such review
                  by Tenant.  The records obtained by Tenant shall be treated as
                  confidential. In no event shall Tenant be permitted to examine
                  Landlord's  records or to dispute  any  statement  of Expenses
                  unless Tenant has paid and continues to pay all Rent when due.
                                       7
                                    EXHIBIT G
                            FORM OF LETTER OF CREDIT
                              ____________________
                         [NAME OF FINANCIAL INSTITUTION]
IRREVOCABLE STANDBY LETTER OF CREDIT NO. _______________
DATE: _________________
BENEFICIARY:
EOP-SHORELINE TECHNOLOGY PARK, L.L.C.,
A DELAWARE LIMITED LIABILITY COMPANY
▇/▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
▇ ▇▇▇▇ ▇▇▇▇ SQUARE
▇▇▇▇ ▇▇ ▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇ ▇▇▇
▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇-▇▇▇▇
APPLICANT:
COMMTOUCH SOFTWARE, INC.,
A CALIFORNIA CORPORATION
____________________________
____________________________
____________________________
____________________________
AMOUNT:  US$1,100,000.00  (ONE  MILLION  ONE  HUNDRED  THOUSAND  AND 00/100 U.S.
         DOLLARS
EXPIRATION DATE: __________________
LOCATION: AT OUR COUNTERS lN SANTA CLARA, CALIFORNIA
GENTLEMEN:
WE  HEREBY   ESTABLISH   OUR   IRREVOCABLE   STANDBY   LETTER   OF  CREDIT   NO.
_________________  IN YOUR FAVOR  AVAILABLE  BY YOUR DRAFTS DRAWN ON US AT SIGHT
AND ACCOMPANIED BY THE FOLLOWING DOCUMENTS: ______________________
1.       THE ORIGINAL OF THIS LETTER OF CREDIT AND ALL AMENDMENT(S), IF ANY.
2.       BENEFICIARY'S  DATED  STATEMENT  SIGNED  BY  ONE  OF  THEIR  AUTHORIZED
         OFFICERS  FOLLOWED BY THEIR  DESIGNATED TITLE CERTIFYING THE FOLLOWING:
         "THIS DRAW IN THE AMOUNT OF US$ (SPECIFY AMOUNT) UNDER YOUR IRREVOCABLE
         LETTER OF CREDIT NO.  _________________  REPRESENTS FUNDS DUE AND OWING
         TO US AS A RESULT OF THE APPLICANT'S COMMISSION OF ANY EVENT OF DEFAULT
         OF ONE OR MORE  OF THE  TERMS  OF THAT  CERTAIN  LEASE  BY AND  BETWEEN
         EOP-SHORELINE  TECHNOLOGY  PARK,  L.L.C.,  AS LANDLORD,  AND  COMMTOUCH
         SOFTWARE, INC., AS TENANT."
PARTIAL  DRAWS ARE ALLOWED.  THIS LETTER OF CREDIT MUST  ACCOMPANY  ANY DRAWINGS
HEREUNDER  FOR  ENDORSEMENT  OF THE  DRAWING  AMOUNT AND WILL BE RETURNED TO THE
BENEFICIARY UNLESS IT IS FULLY UTILIZED.
PROVIDED  THAT YOU HAVE NOT  PROVIDED  US WITH  WRITTEN  NOTICE  OF  APPLICANT'S
DEFAULT, WHICH MUST BE SENT TO US AT SILICON VALLEY BANK,  INTERNATIONAL ▇▇▇▇▇▇▇
▇▇▇▇▇▇▇▇,  ▇▇▇▇ ▇▇▇▇ ▇▇▇▇ 1,3003 ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇, ▇▇ ▇▇▇▇▇, ATTENTION:
LETTERS OF CREDIT DEPARTMENT BY FEDEX OR OTHER OVERNIGHT COURIER SERVICE,  UNDER
THE ABOVE REFERENCED LEASE ON OR BEFORE THE DATE WHICH IS TEN (10) DAYS PRIOR TO
THE EFFECTIVE DATE OF ANY REDUCTION,  AS SET FORTH BELOW,  AND FURTHER  PROVIDED
THAT THE  APPLICANT  IS  OCCUPYING AT LEAST 75% OF THE PREMISES (AS THAT TERM IS
DEFINED IN THE ABOVE REFERENCED LEASE),  THE AMOUNT OF THIS IRREVOCABLE  STANDBY
LETTER OF CREDIT SHALL  AUTOMATICALLY  REDUCE IN  ACCORDANCE  WITH THE FOLLOWING
SCHEDULE: