EXHIBIT 10.3
                                NORTHWEST PARK
   
                                   L E A S E
                                   ARTICLE 1
                                Reference Data
                                ---------------
1.1   Subject Referred To.
      ---------------------
      Each reference in this Lease to any of the following subjects shall be
      construed to incorporate the data stated for that subject in this
      Section 1.1
           Date of this Lease:          July 31,1996
           Building:                    The single level building containing 
                                        approximately 38,801 square feet of
                                        floor area located on the Property.
           Property:                    The parcel of land at ▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇,
                                        ▇▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ as shown on
                                        Exhibit A hereto as Lots D, 61 and 70,
                                        together with the Building located
                                        thereon.
           Premises:                    The entire Property.
           Landlord:                    ▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇,
                                        ▇▇▇▇ ▇▇▇▇▇▇▇▇ and ▇▇▇▇▇▇ ▇.▇▇▇▇▇▇▇ as
                                        Trustees of Maryland Buildings Trust
                                        under Declaration of Trust dated June
                                        22, 1954 filed for registration with the
                                        Middlesex South Registry District of the
                                        Landlord Court as Document No. 552724
                                        noted on Certificate of Title No. 150413
                                        in Registration Book 882, Page 63, as 
                                        amended.
           Original Notice
           Address of Landlord:         c/▇ ▇▇▇▇▇▇▇▇ Management Company Inc.
                                        ▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇
                                        ▇▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
           Tenant:                      INTERMETRICS, INC.
           Original Notice
           Address of Tenant:           ▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                        ▇▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
                                        with a copy to
                                        ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ & ▇▇▇▇,L.L.P.
                                        ▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇
                                        ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
                                        Attention: ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇, P.C
           Landlord's Construction
           Representative:              ▇▇▇▇▇ ▇▇▇▇▇
           Tenant's Construction
           Representative:              ▇▇▇▇▇▇▇ ▇'▇▇▇▇▇▇▇▇
           Term:                        Seven (7) years
           Delivery Date:               December 1,1996
           Annual Fixed Rent Rate:      $350,000.00 during the first four years
                                        of the original term; and $400,000.00
                                        thereafter.
           Monthly Fixed Rent Rate:     $29,166.67 during the first four years
                                        of the original term, and $33,333.33
                                        thereafter.
           Security and 
           Restoration Deposit:         $400,000 in the form of an irrevocable
                                        letter of credit in accordance with
                                        Section 4.4 below.
           Initial Estimate of
           Taxes for the Tax Year:      $54,528   
           Initial Estimate of
           Operating Costs for the
           Calendar Year:               $54,324
           Permitted Uses:              General business offices, light 
                                        assembly and storage.
           Public Liability Insurance Limits:
                Comprehensive General Liability:     $3,000,000 per occurrence
                                       1
 
 
                                        $5,000,000 general aggregate
1.2  Exhibits.
     --------
     The Exhibits listed below in this section are incorporated in this Lease 
     by reference and are to be construed as a part of this Lease.
     
         EXHIBIT A            Plan of Property
         EXHIBIT B            Commencement Date Agreement
         EXHIBIT C            Work Letter
         EXHIBIT D            Work Change Order
1.3  Table of Articles and Sections.
     ------------------------------
     ARTICLE I -- Reference Data
     --------------------------- 
     1.1     Subjects Referred To ......................................
     1.2     Exhibits ..................................................
     1.3     Table of Articles and Sections ............................
     
     ARTICLE II -- Premises and Term
     -------------------------------
         
     2.1     Premises ..................................................
     2.2     Term ......................................................
     2.3     Extension Option ..........................................
          
     ARTICLE III -- Improvements
     ---------------------------
     
     3.1     Performance of Work and Approval
             of Landlord's Work ........................................
     3.2     Acceptance of the Premises ................................
     3.3     Construction Representatives ..............................
         
     ARTICLE IV -- Rent
     ------------------
      
     4.1    The Fixed Rent ............................................. 
     4.2    Additional Rent ............................................
            4.2.1    Real Estate Taxes .................................
            4.2.2    Betterment Assessments ............................
            4.2.3    Tax Fund Payments .................................
            4.2.4    Operating Costs ...................................    
            4.2.5    Insurance .........................................
            4.2.6    Utilities .........................................
     4.3    Late Payment of Rent .......................................
     4.4    Security and Restoration Deposit ...........................
     ARTICLE V -- Landlord's Covenants
     ---------------------------------
     5.1     Affirmative Covenants .....................................
             5.1.1   Repairs ...........................................
             5.1.2   Landscaping .......................................
             5.1.3   Insurance .........................................
             5.1.4   Payment of Tenant's Cost of Enforcement ...........
             5.1.5   Estoppel Certificate ..............................
             5.1.6   Pre-existing Hazardous Materials ..................
     ARTICLE VI -- Tenant's Additional Covenants
     -------------------------------------------
         
     6.1     Affirmative Covenants .....................................   
             6.1.1   Perform Obligations ...............................    
             6.1.2   Use ...............................................
             6.1.3   Repair and Maintenance ............................
             6.1.4   Compliance with Law ...............................
             6.1.5   Indemnification ...................................
             6.1.6   Landlord's Right to Enter .........................
             6.1.7   Personal Property at Tenant's Risk ................
             6.1.8   Payment of Landlord's Cost of Enforcement .........   
             6.1.9   Yield Up ..........................................
             6.1.10  Estoppel Certificate ..............................   
             6.1.11  Landlord's Expenses Re: Consents ..................
     6.2     Negative Covenants ........................................
             6.2.1   Assignment and Subletting .........................
             6.2.2   Overloading and Nuisance ..........................
             6.2.3   Hazardous Wastes and Materials ....................
             6.2.4   Installation, Alterations or Additions ............   
             6.2.5   Signs .............................................
             6.2.6   Parking and Storage ...............................
     ARTICLE VII -- Casualty or Taking 
     ---------------------------------      
                                       
                                       2
 
     7.1       Termination .................................... 
     7.2       Restoration .................................... 
     7.3       Award .......................................... 
     ARTICLE VII - Defaults
     ----------------------
     8.1       Events of Default .............................. 
     8.2       Remedies........................................ 
     8.3       Remedies Cumulative ............................
     8.4       Landlord's Right to Cure Defaults ..............
     8.5       Effect of Waivers of Default ...................
     8.6       No Waiver, etc. ................................
     8.7       No Accord and Satisfaction .....................
     ARTICLE IX - Rights of Holders
     ------------------------------
     9.1       Rights of Holders ..............................
     9.2       Lease Superior or Subordinate to Mortgages .....
     ARTICLE X - Miscellaneous Provisions
     ------------------------------------
     10.1      Notices From One Party to the Other ............
     10.2      Quiet Enjoyment ................................
     10.3      Lease Not to be Recorded .......................
     10.4      Limitation of Landlord's Liability .............
     10.5      Acts of God ....................................
     10.6      Landlord's Default .............................
     10.7      Brokerage ......................................
     10.8      Applicable Law and Construction ................
     10.9      Expansion ......................................
                                   ARTICLE 2
                                   ---------
                               PREMISES AND TERM
                               -----------------
2.1  Premises. Landlord hereby leases to Tenant and Tenant hereby leases from 
     --------
     Landlord, subject to and with the benefit of the terms, covenants,
     conditions and provisions of this Lease, the Premises.
     Tenant shall have, as appurtenant to the Premises, rights for Tenant and
     its agents, employees, contractors and visitors to use in common, with
     others entitled thereto, subject to reasonable rules and regulations from
     time to time made by Landlord of which Tenant is given notice, the common
     roadways, sidewalks and walkways necessary for access to the Property from
     public roads, common parking areas, walkways and grounds, including,
     without limitation, the 25' wide rights of way abutting the Premises (as
     shown on Exhibit A). Approximately 157 parking spaces are located on the
     Premises. In the event that less than 157 parking spaces are available for
     use by Tenant on the Premises for any reason other than the fault or
     neglect of Tenant or any of Tenant's agents, employees, contractors or
     invitees, then, upon ▇▇▇▇▇▇'s request, Landlord shall make available to
     Tenant sufficient additional parking spaces within a reasonable distance
     from the Property so that a total of 157 parking spaces shall be available
     to Tenant between such additional spaces and those which remain available
     on the Premises.
2.2  Term. (A) TO HAVE AND TO HOLD for a term (the "original term") beginning on
     ----
     the Commencement Date, which shall be the earlier of (a) the later of (i)
     the date on which the work to be performed by Landlord pursuant to Exhibit
     C has been substantially completed, and (ii) the date of issuance of a
     temporary or permanent certificate of occupancy, provided that the
     conditions in any such temporary certificate of occupancy can be satisfied
     after Tenant occupies the Premises without material interference with
     Tenant, or (b) the opening by Tenant of its business in the Premises (which
     shall not include merely moving furniture, equipment or supplies into the
     Premises or the installation of wiring or performing other work to prepare
     the Premises for the operation of Tenant's business), and continuing for
     the Term, unless sooner terminated as hereinafter provided. The term
     "substantially completed" as used herein shall mean that the work to be
     performed by Landlord pursuant to Exhibit C has been completed with the
     exception of minor items which can be fully completed without material
     interference with Tenant and other items which because of the season or
     weather or the nature of the item are not practicable to do at the time,
     provided that none of said items is necessary to make the Premises
     tenantable for the Permitted Uses. Landlord shall apply for and take all
     necessary action to obtain such certificate of occupancy, and if a
     temporary certificate of occupancy is issued, Landlord shall be
     responsible for obtaining a permanent certificate of occupancy as soon as
     reasonably possible. Upon ▇▇▇▇▇▇'s request, from time to time, Landlord
     will advise Tenant of Landlord's estimate of when ▇▇▇▇▇▇▇▇'s Work will be
     substantially completed to facilitate ▇▇▇▇▇▇'s efforts to schedule its move
     into the Premises to coincide as nearly as practicable therewith. When the
     dates of the beginning and end of the term have been determined, such dates
     shall be evidenced by a document, in the form attached hereto as Exhibit B,
     executed by Landlord and Tenant and delivered each to the other.
     (B) The parties acknowledge that the Premises are currently occupied an
     existing tenant (the "Existing Tenant") who has held over in the Premises
     after the expiration of its lease which has delayed Landlord's ability to
     commence ▇▇▇▇▇▇▇▇'s Work in order to meet ▇▇▇▇▇▇'s time requirements.
     Accordingly, within 5 business days after the execution and delivery of
     this Lease by Landlord and Tenant, Landlord shall cause to be paid to
     Tenant a one-time payment of $50,000 which is to compensate Tenant for
     delay in the schedule for delivery of the Premises to Tenant caused by the
     Existing ▇▇▇▇▇▇'s continued occupancy of the Premises. Promptly after the
     Existing Tenant vacates and yields up the Premises to Landlord, Landlord
     shall commence and diligently prosecute Landlord's Work under Section 3.1
     hereof, subject to delays caused by Tenant or its agents, employees or
     contractors or other causes beyond ▇▇▇▇▇▇▇▇'s reasonable control. If the
     Commencement Date has not occurred on or before December 31, 1996, then
     Landlord shall pay Tenant a one-time payment of $20,000. The payments to be
     made by Landlord to Tenant under this Section 2.2(B) shall be Tenant's sole
     and exclusive rights and remedies under this Lease, at Law and in equity on
     account of any delay in the performance of Landlord's Work and/or the
     delivery of the Premises to Tenant.
2.3  Extension Option. Tenant shall have the right to extend the term of this 
     ----------------
     Lease for one additional period of five (5) years, to begin immediately
     upon the expiration of the original term of this Lease (the "extended
     term"). All of the terms, covenants and provisions of this Lease shall
     apply to such extended term except that the Annual Fixed Rent Rate for such
     extended term shall be the market rate at time of Tenant's exercise notice
     hereunder timely given during the months specified below, as designated by
     Landlord. If Tenant shall elect to exercise the aforesaid option, it shall
     do so by giving Landlord notice in writing of its intention to do so either
     during the fifty-first (51st) month or the seventy-fifth (75th) month of
     the original term of this Lease. If Tenant timely gives such notice, the
     extension of this Lease shall be automatically affected without the
     execution of any additional documents. The original term and the extended
     term are hereinafter collectively called the "term."
                                       3
          
 
     If the Tenant disagrees with Landlord's designation of the market rate, and
     the parties cannot agree upon the market rate, then the market rate shall
     be submitted to arbitration as follows: market rate shall be determined by
     impartial arbitrators who shall be real estate professionals with
     experience in leasing similar properties, one to be chosen by the Landlord,
     one to be chosen by ▇▇▇▇▇▇, and a third to be selected, if necessary, as
     below provided. The unanimous written decision of the two first chosen,
     without selection and participation of a third arbitrator, or otherwise,
     the written decision of a majority of three arbitrators chosen and selected
     as aforesaid, shall be conclusive and binding upon Landlord and Tenant.
     Landlord and Tenant shall each notify the other of its chosen arbitrator
     within ten (10) days following the call for arbitration and, unless such
     two arbitrators shall have reached a unanimous decision within thirty (30)
     days after their designation, they shall so notify the then President of
     the Boston Bar Association and request him to select an impartial third
     arbitrator, who shall be a real estate professional with experience in
     leasing like types of properties, to determine market rate as herein
     defined. Such third arbitrator and the first two chosen shall hear the
     parties and their evidence and render their decision within thirty (30)
     days following the conclusion of such hearing and notify Landlord and
     Tenant thereof. Landlord and Tenant shall share equally the expense of the
     third arbitrator (if any). If the dispute between the parties as to a
     market rate has not been resolved before the commencement of Tenant's
     obligation to pay Fixed Rent based upon such market rate, then Tenant shall
     pay Fixed Rent under the Lease based upon the market rate designated in
     good faith by Landlord until either the agreement of the parties as to the
     market rate, or the decision of the arbitrators, as the case may be, at
     which time Tenant shall pay any underpayment of Fixed Rent to Landlord, or
     any overpayment shall be credited against the Fixed Rent next payable by
     Tenant hereunder.
     In no event, however, shall the Annual Fixed Rent Rate for the Extended
     Term be less than $400,000.
                                   ARTICLE 3
                                   ---------
                                 IMPROVEMENTS
                                 ------------
3.1  Performance of Work and Approval of Landlord's Work. Landlord shall cause 
     ----------------------------------------------------
     to be performed the work ("Landlord's Work") required by Exhibit C, the
     Work Letter. The final plans and specifications for the work set forth in
     Part B of Exhibit C (the "Part B Work") which have not been completed as of
     the date of this Lease shall be subject to approval by Landlord, which
     approval shall not be unreasonably withheld so long as they emanate from
     and are consistent with Part B of Exhibit C. All such work shall be done in
     a good and workmanlike manner employing new, first quality materials and so
     as to conform to all applicable laws. Tenant agrees that Landlord may make
     any changes in such work which may become reasonably necessary or advisable
     with the written approval of Tenant, which shall not be unreasonably
     withheld or delayed provided that such changes are not inconsistent with
     Part B of Exhibit C. Landlord shall use reasonable diligence to cause
     Landlord's Work to be substantially completed by the Delivery Date, subject
     to the provisions of Section 10.5 hereof. ▇▇▇▇▇▇▇▇ agrees that Tenant may
     make changes in such work with the approval of Landlord, which approval
     shall not be unreasonably withheld so long as ▇▇▇▇▇▇ agrees to be
     responsible for any cost increases and/or delays associated therewith, and
     the execution by Landlord and Tenant of a Work Change Order, in the form
     attached hereto as Exhibit D. Promptly after ▇▇▇▇▇▇▇▇'s approval of any
     changes requested by Tenant hereunder, Landlord and Tenant shall execute a
     Work Change Order reflecting the same. Tenant shall pay Landlord, as
     additional rent, the amount (if any) by which the Part B Price (as defined
     below) exceeds $400,000, payment to be made against Landlord's invoice
     therefor on the Commencement Date. For the purposes hereof the "Part B
     Price" shall mean the aggregate of all costs and expenses reasonably
     incurred by Landlord in performing the Part B Work, being the cost of the
     contract with Landlord's contractor (which shall be based upon the cost of
     the Part B Work plus a contractor's fee not to exceed 6% thereof), plus
     architectural and engineering fees incurred by Landlord in connection with
     the Part B Work, plus a development fee to Landlord equal to 3% of the
     aggregate of the foregoing. Landlord agrees that the Building shall be as
     weathertight as other comparable buildings in comparable office parks in
     the Burlington Bedford areas.
3.2  Acceptance of the Premises. Tenant or its representatives may, at 
     -------------------------- 
     reasonable times, enter upon the Premises during the progress of the work
     to inspect the progress thereof and to determine if the work is being
     performed in accordance with the requirements of Section 3.1 and the Work
     Letter. Tenant shall promptly give to Landlord notices of any alleged
     failure by Landlord to comply with those requirements. Landlord's Work
     shall be deemed approved by Tenant when Tenant occupies the Premises for
     the conduct of its business, expect for items of Landlord's Work which are
     uncompleted or do not conform to Exhibit C which are, in either case,
     included on a punch list submitted by Tenant to Landlord on the date of
     such occupancy, or (b) latent defects or failures to complete or conform to
     Exhibit C not then discoverable by a reasonable, visual examination and as
     to which Tenant shall have given Landlord written notice within one (1)
     year after such occupancy. Landlord shall complete such punch list items,
     and shall cure such failures to complete or conform, with reasonable
     diligence after such occupancy, and shall promptly cure any such latent
     defects.
3.3  Construction Representatives. Each party authorizes the other to rely in 
     -----------------------------
     connection with plans and construction upon written approval and other
     actions on the party's behalf by any Construction Representative of the
     party named in Section 1.1 or any person hereafter designated in
     substitution or addition by notice to the party relying.
                                    ARTICLE 4
                                    ---------
                                     RENT
                                     ----
4.1  The Fixed Rent. Tenant covenants and agrees to pay rent to Landlord at the 
     -------------- 
     Original Address of Landlord or at such other place or to such other person
     or entity as Landlord may by notice in writing to Tenant from time to time
     direct, at the Annal Fixed Rent Rate, in equal installments at the Monthly
     Fixed Rent Rate (which is 1/12th of the Annual Fixed Rent Rate), in
     advance, on the first day of each calendar month included in the term; and
     for any portion of a calendar month at the beginning or end of the term, at
     that rate payable in advance for such portion. Notwithstanding the
     occurence of the Commencement Date on or after the Delivery Date pursuant
     to clause (b) of the first sentence of Section 2.2, Fixed Rent shall not
     accrue or be payable until the Landlord's Work has been substantially
     completed (as that term is defined in Section 2.2).
     If Landlord shall give notice to Tenant that all rent and other payments
     due hereunder are to be made to Landlord by electronic funds transfers, so
     called, or by similar means, Tenant shall make all such payments as shall
     be due more than ten (10) days after receipt of said notice by means of
     said electronic funds transfers (or such similar means as designated by
     Landlord).
4.2  Additional Rent. In order that the Fixed Rent shall be absolutely net to 
     ---------------
     Landlord (except to the extent otherwise expressly provided herein), Tenant
     covenants and agrees to pay, as Additional Rent, taxes, betterment
     assessments, operating costs, insurance costs, and utility charges with
     respect to the Premises as provided in this Section 4.2 as follows:
4.2.1     Real Estate Taxes. Tenant shall pay to Landlord all taxes levied or 
          ------------------
          assessed by, or becoming payable to the municipality or any
          governmental authority having jurisdiction of the Property, for or in
          respect of the Property or which may become a lien on the Property,
          for each tax period partially or wholly included in the term, such
          payments to be made to Landlord in the manner provided in Subsection
          4.2.3 of this section 4.2. For any fraction of a tax period included
          in the term at the beginning or end thereof, Tenant shall pay to
          Landlord the fraction of taxes so levied or assessed or becoming
          payable which is allocable to such included period. Tenant may
          prosecute
          
                                       4
 
          appropriate proceedings for abatement or reduction of any tax with
          respect to which Tenant is required to make payments as hereinbefore
          provided, such proceedings to be conducted jointly with any other
          parties, including Landlord, who have contributed to the payment of
          such taxes, and ▇▇▇▇▇▇ agrees to save Landlord harmless from all costs
          and expenses incurred on account of ▇▇▇▇▇▇'s participation in such
          proceedings. Landlord, without obligating itself to incur any costs or
          expenses in connection with such proceedings, shall cooperate with
          Tenant with respect to such proceedings so far as reasonably
          necessary. Any abatement or reduction effected by such proceedings
          shall accrue to the benefit of ▇▇▇▇▇▇ and Landlord and such other
          parties as their interests may appear according to their respective
          contributions to the taxes involved in any such proceedings. Nothing
          contained in this Lease shall however, require Tenant to pay any
          franchise, corporate, estate, inheritance, succession, capital levy or
          transfer tax of Landlord, or any income, profits or revenue tax or
          charge upon the rent payable by Tenant under this Lease, provided,
          however, that if, at any time during the term hereof, the present
          system of ad valorem taxation of real property shall be changed so
          that in lieu of, or in addition to, the whole or any part thereof
          there shall be assessed on Landlord a capital levy or other tax on the
          Fixed Rent, Additional Rentals or other charges payable by Tenant
          hereunder, or if there shall be assessed on Landlord a federal, state,
          county, municipal, or other local income, franchise, excise or similar
          tax, assessment, levy or charge measured by or based, in whole or in
          part, upon the Fixed Rentals, Additional Rents or other charges
          payable by Tenant hereunder, then any and all of such taxes,
          assessments, levies or charges, to the extent that the same would be
          payable if the Property were the only property of Landlord subject to
          same, and if the income from the Property were the only taxable income
          of Landlord during the year in question, shall be deemed to be
          included in the taxes to be paid by Tenant pursuant to this subsection
          4.2.1.
4.2.2     Betterment Assessments. Tenant shall pay to Landlord each installment 
          -----------------------   
          of all public, special or betterment assessments first levied or
          assessed by or becoming payable to any municipality or other
          governmental authority having jurisdiction of the Property after the
          Commencement Date, for or in respect of the Property for each 
          installment period partially or wholly included in the term, such 
          payments to be made to Landlord in the manner provided in Subsection 
          4.2.3 of this Section 4.2. For any fraction of an installment period 
          included in the term at the beginning or end thereof, Tenant shall pay
          to Landlord the fraction of such installment allocable to such 
          included period. Tenant may prosecute appropriate proceedings to 
          contest the validity or amount of any assessment with respect to which
          Tenant is required to make payments as hereinbefore provided, such
          proceedings to be conducted jointly with any other parties, including
          Landlord, who have contributed to the payment of such assessments, and
          ▇▇▇▇▇▇ agrees to save Landlord harmless from all costs and expenses
          incurred on account of ▇▇▇▇▇▇'s participation in such proceedings.
          Landlord, without obligating itself to incur any costs or expenses in
          connection with such proceedings, shall cooperate with Tenant with
          respect to such proceedings so far as reasonably necessary. Landlord
          shall promptly furnish to Tenant a copy of any notice of public,
          special or betterment assessment received by Landlord concerning the
          Property.
4.2.3     Tax Fund Payments. Tenant shall, as Addition Rent, on the first day of
          ------------------
          each month of the term, make tax fund payments to Landlord. "Tax fund
          payments" refer to such payments as Landlord shall reasonably 
          determine to be sufficient to provide in the aggregate a fund adequate
          to pay all taxes and assessments referred to in Subsection 4.2.1 and
          4.2.2 of this Section 4.2 when they become due and payable and all
          such payments shall, to the extent thereof, relieve Tenant of its
          obligations under said subsections. The initial calculation of the
          monthly estimated payments shall be based upon the Initial Estimate of
          Taxes of the Tax Year and upon quarterly payments being due to the
          governmental authority on August 1, November 1, February 1 and May 1,
          and shall be made when the Commencement Date has been determined. If
          the aggregate of said tax fund payments is not adequate to pay all
          said taxes and assessments, Tenant shall pay to Landlord the amount by
          which such aggregate is less than the amount equal to all said taxes
          and assessments, such payment to be made within ten (10) days after
          receipt by Tenant of notice from Landlord of such amount. If Tenant
          shall have made the aforesaid payments, Landlord shall on or before
          the last day on which the same may be paid without interest or
          penalty, pay to the proper authority charged with the collection
          thereof all taxes and assessments referred to in said subsections
          4.2.1 and 4.2.2 and furnish Tenant, upon request, reasonable evidence
          of such payment. Any balance remaining after such payment by Landlord
          shall be credited against the next accruing payments to be made by
          Tenant pursuant to this subsection 4.2.3, or refunded to Tenant if the
          term of this Lease has expired or terminated and Tenant has no further
          obligation to Landlord, as the case may be. Landlord shall deliver
          to Tenant a copy of all bills for taxes and assessments referred to in
          Section 4.2.1 and 4.2.2 hereof promptly after Landlord's receipt
          thereof.
4.2.4     Operating Costs. Tenant shall pay to Landlord, Operating Costs (as 
          ----------------
          hereinafter defined) incurred by Landlord in any calendar year. Tenant
          shall remit to Landlord, on the first day of each calendar month,
          estimated payments on account of Operating Costs, such monthly
          amounts to be sufficient to provide Landlord, by the end of the
          calendar year, a sum equal to the Operating Costs, as reasonably
          estimated by ▇▇▇▇▇▇▇▇ from time to time. The initial monthly estimated
          payments shall be in an amount equal to 1/12th of the Initial Estimate
          of Operating Costs for the Calendar Year. If, at the expiration of the
          year in respect of which monthly installments of Operating Costs shall
          have been made as aforesaid, the total of such monthly remittances is
          greater than the actual Operating Costs for such year, Landlord shall
          promptly pay to Tenant, or credit against the next accruing payments
          to be made by Tenant pursuant to this subsection 4.2.4, the
          difference; if the total of such remittances is less than the
          Operating Costs for such year, Tenant shall pay the difference to
          Landlord within twenty (20) days from the date Landlord shall furnish
          to Tenant an itemized statement of such Operating Costs, prepared and
          computed in accordance with generally accepted accounting principles.
          Any reimbursement for Operating Costs due and payable by Tenant with
          respect to periods of less than twelve (12) months shall be equitably
          prorated.
          The term "Operating Costs" shall mean:
          (a)  all reasonable costs incurred by Landlord in performing
               maintenance and making repairs and replacements pursuant to
               subsection 5.1.1;
          (b)  all reasonable costs incurred by Landlord in performing its 
               obligations under subsection 5.1.2;
          (c)  all reasonable costs of any insurance carried by Landlord 
               pursuant to subsection 5.1.3;
          (d)  all reasonable costs incurred by Landlord in connection with 
               maintenance and operation of common areas and facilities of the
               Property and Tenant's exclusive parking areas;
          (e)  reasonable payments under all service contracts relating to
               matters referred to in Items (a) through (d) hereof; and
          (f)  a reasonable and competitive management fee that does not exceed 
               the rate charged by managers of comparable buildings for similar
               services in comparable office parks in the Burlington Bedford
               area;.
          If, during the term of this Lease, Landlord shall replace any capital
          items or make any capital expenditures in connection with repair or
          replacement of the roof or the exterior walls or in connection with
          its obligations under
                                       5
 
               subsection 6.1.4(collectively called "capital expenditures") and
               such capital expenditures are not occasioned by any act or
               negligence of Tenant, its employees, customers, suppliers,
               contractors, and the like, the total amount of such capital
               expenditures shall not be included in Operating Costs for the
               calendar year in which they are made, but there shall
               nevertheless be included in Operating Costs for each calendar
               year in which and after such capital expenditure is made the
               annual charge-off of such capital expenditure. (Annual charge-off
               shall be determined by (i) dividing the original cost of the
               capital expenditure by the number of years of useful life thereof
               [The useful life shall be reasonably determined by Landlord in
               accordance with generally accepted accounting principles and
               practices in effect at the time of acquisition of the capital
               item.]; and (ii) adding to such quotient an interest factor
               computed on the unamortized balance of such capital expenditure
               based upon an interest rate reasonably determined by Landlord as
               being the interest rate then being charged for long-term
               mortgages by institutional lenders on like properties within the
               locality in which the Building is located).
               There shall not be including in Operating Costs:
               (1)       The costs of repairs incurred by Landlord in the event
                         of a fire or other casualty or in the event of a taking
                         by eminent domain or resulting from acts or omissions
                         of Landlord or its employees, agents or contractors; or
               (2)       Costs of performing Landlord's Work; or
               (3)       Costs of correcting defects in Landlord's Work during
                         the first year of Tenant's occupancy of the Premises or
                         failures to complete or conform of which Tenant gives
                         timely notice under Section 3.2, and Costs of
                         correcting defects in Landlord's Work thereafter to the
                         extent (if any) Landlord has received reimbursement
                         pursuant to any contractor's warranty relating thereto
                         [Landlord hereby agreeing to use reasonable efforts to
                         obtain reimbursements to which it is entitled
                         thereunder]; to
               (4)       Costs of correcting any violations of law existing in
                         the Premises as of the Commencement Date.
     4.2.5     Insurance. Tenant shall, at its expense, as Additional Rent,
               ---------
               take out and maintain throughout the term the following insurance
               protecting Landlord:
               4.2.5.1   Comprehensive liability insurance naming Landlord,
                         Tenant, and ▇▇▇▇▇▇▇▇'s managing agent and any mortgagee
                         of which ▇▇▇▇▇▇ has been given notice as insureds or
                         additional insureds and indemnifying the parties so
                         named against all claims and demands for death or any
                         injury to person or damage to property which may be
                         claimed to have occurred on the Property or on any
                         property, streets or ways adjoining the Property, in
                         amounts which shall, at the beginning of the term, be
                         at least equal to the limits set forth in Section 1.1,
                         and, which, from time to time during the term, shall be
                         for such higher limits, if any, as are customarily
                         carried in the area in which the Premises are located
                         on property similar to the Property and used for
                         similar purposes; and workmen's compensation insurance
                         with statutory limits covering all of Tenant's
                         employees working on the Premises.
               4.2.5.2.  Fire insurance with the usual extended coverage
                         endorsements covering all Tenant's furniture,
                         furnishings, fixtures and equipment and any other
                         contents or improvements not covered by the insurance
                         to be maintained under subsection 5.1.3.1.
               4.2.5.3   All such policies shall be obtained from responsible
                         companies not legally prohibited from doing business in
                         Massachusetts, which companies and the amount of
                         insurance allocated thereto shall be subject to
                         Landlord's reasonable approval, consistent with
                         practices in the vicinity of the Building. ▇▇▇▇▇▇
                         agrees to furnish Landlord with certificates evidencing
                         all such insurance prior to the beginning of the term
                         hereof and evidencing renewal thereof at least thirty
                         (30) days prior to the expiration of any such policy.
                         Each such certificate shall require the insurance
                         company to endeavor to give Landlord at least ten (10)
                         days' prior written notice of any cancellation thereof.
                         In the event provision for any such insurance is to be
                         by a blanket insurance policy, the policy shall
                         allocate a specific and sufficient amount of coverage
                         to the Property.
               4.2.5.4   All insurance which is carried by either party with
                         respect to the Building, Premises or to furniture,
                         furnishings, fixtures, or equipment therein or
                         alterations or improvements thereto, whether or not
                         required, shall include provisions which either
                         designate the other party as one of the insured or deny
                         to the insurer acquisition by subrogation of rights of
                         recovery against the other party, provided that such
                         provisions may be effective without making it
                         impossible to obtain insurance coverage from
                         responsible companies qualified to do business in the
                         state in which the Premises are located (even though
                         extra premium may result therefrom). In the event that
                         extra premium is payable by either party as a result of
                         this provision, the other party shall reimburse the
                         party paying such premium the amount of such extra
                         premium. If at the request of one party, this non-
                         subrogation provision for the benefit of that party is
                         waived, then the obligation of reimbursement shall
                         cease for such period of time as such waiver shall be
                         effective, but nothing contained in this subsection
                         shall derogate from or otherwise affect releases
                         elsewhere herein contained of either party for claims.
                         Each party shall be entitled to have certificates of
                         any policies containing such provisions. Each party
                         hereby waives all rights of recovery against the other
                         for loss or injury against which the waiving party is
                         protected by insurance containing said provisions.
                         Tenant shall not acquire as insured under any insurance
                         carried by Landlord on the Property any right to
                         participate in the adjustment of loss or to receive
                         insurance proceeds and agrees upon request promptly to
                         endorse and deliver to Landlord any checks or other
                         instruments in payment under such policies of loss in
                         which Tenant is named as payee.
     4.2.6     Utilities. Tenant shall pay directly to the proper authorities
               ---------
               charged with the collection thereof all charges for water, sewer,
               gas, oil, electricity, telephone and other utilities or services
               used or consumed on the Property during the term of this Lease,
               whether designated as a charge, tax, assessment, fee or
               otherwise, including, without limitation, water and sewer use
               charges and taxes, if any, all such charges to be paid as the
               same from time to time become due. The utilities presently
               available to the Premises are each separately metered. Except as
               otherwise provided in Exhibit C, it is understood and agreed that
               Tenant shall make its own arrangements for the installation or
               provision of all such utilities and that Landlord shall be under
               no obligation to furnish any utilities to the Premises and shall
               not be liable for any interruption or failure in the supply of
               any such utilities to the Property. Landlord shall pay any
               charges for any utilities furnished to the Premises prior to the
               Commencement Date to the extent additional requirements (such as
               a security deposit) would be imposed upon Tenant if such charges
               remain unpaid.
4.3  Late Payment of Rent. If any installment of rent is paid after the date the
     --------------------
     same was due, and if on a prior occasion in the twelve (12) month period
     prior to the date such installment was due an installment of rent was paid
     after the same was due, then Tenant shall pay Landlord a late payment fee
     equal to five (5%) percent of the overdue payment.
                                       6
 
4.4   Security and Restoration Deposit. Upon the execution of this Lease, Tenant
      --------------------------------
      shall deliver to Landlord an irrevocable letter of credit for the amount
      of the Security and Restoration Deposit, from a banking institution
      reasonably satisfactory to both Landlord and Tenant, to expire no earlier
      than one year from the date the letter of credit is delivered to Landlord.
      Landlord shall have the right to present the letter of credit, and draw
      the full amount thereof by a sight draft, accompanied by ▇▇▇▇▇▇▇▇'s
      certification that:
                    (a)  Tenant is in default in the performance of any of its
          obligations to pay the Fixed Rent or Additional Rent and such default
          has continued for ten (10) days after Landlord has not given written
          notice of such default;
                    (b)  Tenant is in default in the performance of any other
          covenant or condition of this Lease on the part of Tenant to be
          performed or observed and within thirty days after Landlord has given
          written notice of such default and Tenant has not commenced diligently
          to correct the default or defaults or has thereafter diligently
          pursued correction to completion; or
                    (c)  an event of the character described in clauses (b)
          through (f) of Section 8.1 of this Lease has occurred and is
          continuing at the time Landlord is permitted to give notice of
          termination described in Section 8.1; or
                    (d)  ▇▇▇▇▇▇▇▇ has not received within thirty days prior to
          the expiration of the letter of credit an irrevocable extension
          thereof for at least one year beyond the current expiration date, or a
          replacement thereof issued by a banking institution reasonably
          acceptable to Landlord with an expiration date at least one year
          following the expiration date of the letter of credit being replaced
          and otherwise satisfying the requirements hereof.
      Upon receipt of the proceeds of the letter of credit, Landlord shall hold
      the same as a security deposit for the faithful performance by Tenant of
      all the terms of this Lease by Tenant to be observed and performed. The
      security deposit shall not be mortgaged, assigned, transferred or
      encumbered by Tenant without the written consent of Landlord and any such
      act on the part of Tenant shall be without force and effect and shall not
      be binding upon Landlord. If the Fixed Rent or Additional Rent payable
      hereunder shall be overdue and unpaid or should Landlord make payments on
      behalf of the Tenant, or Tenant shall fail to perform any of the terms of
      this Lease, then Landlord may, at its option and without prejudice to any
      other remedy which Landlord may have on account thereof, appropriate and
      apply said entire deposit or so much thereof as may-be necessary to
      compensate Landlord toward the payment of Fixed Rent, Additional Rent or
      other sums or loss or damage sustained by Landlord due to such breach on
      the part of Tenant; and Tenant shall forthwith upon demand restore said
      security to the original sum deposited. Should Tenant comply with all of
      said terms and promptly pay all of the rentals as they fall due and all
      other sums payable by Tenant to Landlord, said deposit and any interest
      earned ▇▇▇▇▇▇▇ shall be returned in full to Tenant at the end of the term.
      In the event of bankruptcy or other creditor-debtor proceedings against
      Tenant, all securities shall be deemed to be applied first to the payment
      of rent and other charges due Landlord for all periods prior to the filing
      of such proceedings.
      Provided that Tenant is not then in default hereunder (after notice and
      expiration of any grace period), and ▇▇▇▇▇▇ continues to be profitable,
      the Security and Restoration Deposit shall be reduced by $60,000 on each
      of the first through sixth anniversaries of the Commencement Date, and
      shall remain at $40,000 thereafter. Prior to each anniversary date, Tenant
      shall provide proof reasonably satisfactory to Landlord of Tenant's
      profitability in order for such reduction to be permitted.
      If the letter of credit shall be in effect at the end of the Term,
      Landlord shall surrender the same for cancellation within one month after
      Tenant shall have vacated and delivered the Premises to Landlord in the
      condition required under this Lease, provided the Tenant is not then
      otherwise in default under this Lease.
                                   ARTICLE 5
                                   ---------
                             LANDLORD'S COVENANTS
                             --------------------
5.1   Affirmative Covenants. Landlord covenants with Tenant:
      ---------------------
      5.1.1 Repairs. To correct defects or omissions in Landlord's Work of which
            -------
            Tenant shall have given Landlord written notice within one (1) year
            after Tenant's occupancy of the Premises and to make such repairs
            and replacements to items of Landlord's Work, the roof, exterior
            walls, foundations and structural elements of, and utility lines and
            connections to, the Building (other than doors, windows and glass)
            and the parking areas, driveways and walkways on the Property, as
            may be necessary, and to maintain, and make such replacements and
            repairs to, the heating, ventilating and air conditioning systems of
            the Building, as may be necessary in order to maintain the same in a
            condition substantially equivalent to the condition of comparable
            buildings in comparable office parks in the Burlington Bedford area,
            it being agreed that said heating, ventilation and air conditioning
            system shall be sufficient to maintain the Premises at comfortable
            temperatures so long as Tenant's use does not produce demands in
            excess of normal office use or involve additional equipment not
            shown on the plans for Landlord's Work;
      5.1.2 Landscaping, Etc. To provide landscaping and grounds maintenance for
            ----------------
            the landscaped areas of the Property, and snow, ice and debris
            removal and service for the aforementioned right of way abutting the
            Premises and the parking area located on Lot 70 substantially
            equivalent to that provided in comparable office parks in the
            Burlington Bedford area;
      5.1.3 Insurance. To take out and maintain throughout the term the
            --------- 
            following insurance:
            5.1.3.1  All risk casualty insurance, with endorsement for
                     difference in conditions coverage, debris removal and
                     demolition, in an amount at least equal to the replacement
                     cost of the Building and other improvements on the
                     Premises, as such replacement cost may from time to time be
                     determined by Landlord. All such policies shall be obtained
                     from responsible companies not legally prohibited from
                     doing business in Massachusetts. ▇▇▇▇▇▇▇▇ agrees to furnish
                     Tenant promptly upon request with certificates evidencing
                     all such insurance under which the insurance company will
                     endeavor to give Tenant (10) days' prior written notice of
                     any cancellation thereof. In the event provision for any
                     such insurance is to be by a blanket insurance policy, the
                     policy shall allocate a specific and sufficient amount of
                     coverage to the Property.
            5.1.3.2  Insurance protecting Landlord against abatement or loss of
                     rent in an amount equal to at least all the Fixed Rent and
                     Additional Rent payable for one year under Article 4.
5.1.4 Payment of Tenant's Cost of Enforcement. To pay on demand Tenant's
      ---------------------------------------
      expenses, including reasonable attorneys' fees, incurred in enforcing any
      obligation of Landlord under this Lease, but only after a final judgement
      has been entered in favor of Tenant in an action seeking such enforcement
      which has become final beyond appeal.
                                       7
 
5.1.5     Estoppel Certificate.  Upon not less than fifteen (15) days' prior
          -------------------- 
          written request by ▇▇▇▇▇▇, to execute, acknowledge and deliver to
          Tenant a statement in writing certifying that this Lease is unmodified
          and in full force and effect and that to the best of Landlord's
          knowledge Tenant is not in default under the Lease beyond the
          expiration of any applicable grace periods (or, if there have been a
          modifications, that the Lease is in full force and effect as modified
          and stating the modifications and, if there are any such default known
          to the Landlord, setting them forth in reasonable detail), and the
          dates to which the Fixed Rent and Additional Rent and other charges
          have been paid. Any such statement delivered pursuant to this
          subsection 5.1.5 may be relied upon by any prospective purchaser,
          lender or investor of Tenant or a prospective subtenant or assignee.
5.1.6     Pre-existing Hazardous Materials. Landlord shall indemnify and save
          --------------------------------
          Tenant harmless from all claims, liability, loss or damage which may
          at any time be incurred by Tenant arising on account of a release or
          threatened release at, on or under the Property of hazardous wastes,
          hazardous materials or oil present at, on, under the Property as of
          the date of this Lease, including, without limitation, liability under
          any federal, state or local laws, requirements and regulations;
          provided, however, this indemnity shall not apply in the event Tenant
          uses or disposes at, on or under the Property the hazardous wastes,
          hazardous materials or oil which are the subject of such claim,
          liability, loss or damage except for any used in copy machines,
          printers or other commonly used office products, equipment or
          supplies.
                                   ARTICLE 6
                                   ---------
                         TENANT'S ADDITIONAL COVENANTS
                         -----------------------------
6.1       Affirmative Covenants. Tenant covenants at all times during the term
          ---------------------
          and for such further time (prior or subsequent thereto) as Tenant
          occupies the Premises or any part thereof:
          6.1.1    Perform Obligations. To perform promptly all of the
                   -------------------
                   obligations of Tenant set forth in this Lease; and to pay
                   when due the Fixed Rent and Additional Rent and all charges,
                   rates and other sums which by the terms of this Lease are to
                   be paid by ▇▇▇▇▇▇.
          6.1.2    Use. To use the Premises only for the Permitted Uses, and 
                   ---
                   from time to time to procure all licenses and permits
                   necessary therefor, at Tenant's sole expense. Failure to use
                   and/or occupy the Premises continuously shall not in and of
                   itself constitute a default hereunder so long as all of
                   Tenant's covenants and obligations under this Lease are being
                   performed and observed. With respect to any licenses or
                   permits for which Tenant may apply, pursuant to this
                   subsection 6.1.2 or any other provision hereof, Tenant shall
                   furnish Landlord copies of applications therefor on or before
                   their submission to the governmental authority.
          6.1.3    Repair and Maintenance. Except as otherwise provided in 
                   ----------------------
                   subsection 5.1.1, 5.1.2 and Article 7, to keep the Premises
                   (including, without limitation, the exterior of the Building,
                   all improvements thereon and all plumbing, electrical,
                   mechanical and other fixtures and equipment now or hereafter
                   on the Premises) in good order, condition and repair and at
                   least as good order, condition and repair as they are in on
                   the Commencement Date or may be put in during the term,
                   reasonable use and wear and damage by casualty or eminent
                   domain only excepted; to keep in good repair and clean and
                   neat and free of snow and ice all surfaced roadways, walks,
                   and parking and loading areas; and to make all repairs and
                   replacements and to do all other work necessary for the
                   foregoing purposes whether the same may be ordinary or
                   extraordinary, foreseen or unforseen. It is further agreed
                   that the exception of reasonable use and wear shall not apply
                   so as to permit Tenant to keep the Premises in anything less
                   than suitable, tenant like, and efficient and usable
                   condition, or in less than good and tenantlike repair.
         6.1.4     Compliance with Law. To make all repairs, alterations, 
                   -------------------
                   additions or replacements to the Premises required by any law
                   or ordinance or any order or regulation of any public
                   authority; to keep the Premises equipped with all safety
                   appliances so required; and to comply with the orders and
                   regulations of all governmental authorities with respect to
                   zoning, building, fire, health and other codes, regulations,
                   ordinances or laws applicable to the Premises, except that
                   Tenant may defer compliance so long as the validity of any
                   such law, ordinance, order or regulations shall be contested
                   by Tenant in good faith and by appropriate legal proceedings,
                   if Tenant first gives Landlord appropriate assurance or
                   security against any loss, cost or expense on account
                   thereof. Notwithstanding the foregoing, it is understood and
                   agreed that Tenant shall not be required to do any of the
                   foregoing in order to correct any violation of law existing
                   in the Premises as of the Commencement Date or in order to
                   cause the Premises to comply with any law which is applicable
                   to office buildings generally, which shall be Landlord's
                   obligation to comply with (as opposed to any which applies to
                   Tenant's particular use or manner or method of use, which
                   shall be Tenant's obligation to comply with).
         6.1.5     Indemnification. To save Landlord harmless, and to exonerate 
                   ---------------
                   and indemnify Landlord from and against any and all claims,
                   liabilities or penalties asserted by or on behalf of any
                   person, firm, corporation or public authority on account of
                   injury, death, damage or loss to person or property in or
                   upon the Premises or the Property (a) prior to the
                   Commencement Date, arising out of the negligence or willful
                   misconduct of Tenant or any of its agent, employees or
                   contractors, and (b) thereafter arising out of the use or
                   occupancy of the Premises by Tenant or by any person claiming
                   by, through or under Tenant (including, without limitation,
                   all patrons, employees and customers of Tenant), or
                   arising out of any delivery to or service supplied to the
                   Premises or the Property, or on account of or based upon
                   anything whatsoever done on the Premises or the Property,
                   except if the same was caused by the willful negligence,
                   fault or misconduct of Landlord, its agents, servants,
                   employees or contractors. In respect of all of the foregoing,
                   Tenant shall indemnify Landlord from and against all
                   reasonable costs, expenses (including reasonable attorneys'
                   fees), and liabilities incurred in or in connection with any
                   such claim, action or proceeding brought thereon; and, in
                   case of any action or proceeding brought against Landlord by
                   reason of any such claim, Tenant, upon reasonable advance
                   notice from Landlord and at Tenant's expense, shall resist
                   or defend such action or proceeding and employ counsel
                   therefor reasonably satisfactory to Landlord.
         6.1.6     Landlord's Right to Enter. To permit Landlord and its agents
                   -------------------------
                   to enter into and examine the Premises at reasonable times
                   and to show the Premises, and to make repairs to the
                   Premises, and, during the last six (6) months prior to the
                   expiration of this Lease, to keep affixed in suitable places
                   notices of availability of the Premises, provided that
                   Landlord shall use reasonable efforts to minimize
                   interference with Tenant's business operations. Landlord
                   acknowledges that portions of the Premises may be subject to
                   secrecy restrictions and security requirements imposed by the
                   Federal government and other customers of Tenant. Tenant may,
                   from time to time, notify Landlord of any area(s) of the
                   Premises that are subject to such restrictions and
                   requirements and the period of time for which they will be in
                   effect. Landlord agrees that (except in emergency situations)
                   if Landlord desires access to any area for which it has
                   received a notice hereunder during the time period specified
                   therein, Landlord shall give Tenant at least seven (7)
                   business days advance written notice thereof, and Tenant
                   shall make whatever arrangements may be necessary to permit
                   such access in compliance with the applicable security
                   requirements within such period, provided that if such
                   arrangements cannot reasonably be made within such seven
                                       8
 
               (7) day period, Tenant shall so notify Landlord and such period
               shall be extended by such additional time as may be reasonably
               necessary to do so, but in no event longer than an additional
               fourteen (14) business days.
     6.1.7     Personal Property at Tenant's Risk. All of the furnishings,
               ----------------------------------               
               fixtures, equipment, effects and property of every kind, nature
               and description of Tenant and of all persons claiming by, through
               or under Tenant which, during the continuance of this Lease or
               any occupancy of the Premises by Tenant or anyone claiming under
               Tenant, may be on the Premises, shall be at the sole risk and
               hazard of Tenant and if the whole or any part thereof shall be
               destroyed or damaged by fire, water or otherwise, or by the
               leakage or bursting of water pipes, steam pipes, or other pipes,
               by theft or from any other cause no part of said loss or damage
               is to be charged to or to be borne by Landlord, except that
               Landlord shall in no event be indemnified or held harmless or
               exonerated from any liability to Tenant or to any other person,
               for any injury, loss, damage or liability to the extent
               prohibited by law.
     6.1.8     Payment of Landlord's Cost of Enforcement. To pay on demand 
               -----------------------------------------
               Landlord's expenses, including reasonable attorneys' fees,
               incurred in enforcing any obligation of Tenant under this Lease
               or in curing any default by Tenant under this Lease as provided
               in Section 8.4, but only after a final judgment has been entered
               in favor of Landlord in an action seeking such enforcement or
               concerning such default which has become final beyond appeal.
     6.1.9     Yield Up. At the expiration of the term or earlier termination of
               --------
               this Lease: to surrender all keys to the Premises; to remove all
               of its trade fixtures and personal property in the Premises; to
               remove such installations made by it as Landlord may designate at
               the time of Landlord's approval of the installations in question
               (including computer and telecommunications wiring and cabling)
               and all Tenant's signs wherever located; to repair all damage
               caused by such removal and to yield up the Premises (including
               all installations and improvements made by Tenant except for
               trade fixtures and such of said installations or improvements as
               Landlord shall request Tenant to remove), broom-clean and in the
               same good order and repair in which Tenant is obliged to keep and
               maintain the Premises by the provisions of this Lease. Any
               property not so removed shall be deemed abandoned and, if
               Landlord so elects, deemed to be Landlord's property, and may be
               retained or removed and disposed of by Landlord in such manner as
               Landlord shall determine and Tenant shall pay Landlord the entire
               cost and expense incurred by it in effecting such removal and
               disposition and in making any incidental repairs and replacements
               to the Premises and for use and occupancy during the period after
               the expiration of the term and prior to its performance of its
               obligations under this subsection 6.1.9. Tenant shall further
               indemnify Landlord against all loss, cost and damage resulting
               from ▇▇▇▇▇▇'s failure and delay in surrendering the Premises as
               above provided.
          
               The parties acknowledge and agree that Landlord has approved the
               installation of the kitchen, lunchroom and shower facilities (the
               "Non-Standard Improvements") included in the Part B Work on the
               condition that at the expiration or earlier termination of the
               term hereof, Tenant shall pay $7,500 (the "Restoration Fund") to
               Landlord which may be used by Landlord to remove the Non-Standard
               Improvements, in whole or in part, and restore the demolished
               area to the condition of general office space within 9 months
               thereafter. All or any portion of the Restoration Fund which has
               not been expended for reasonable costs and expenses for such
               demolition and restoration at the end of such 9 month period
               shall be promptly paid to Tenant. Upon ▇▇▇▇▇▇'s request, Landlord
               shall provide Tenant with reasonable documentation supporting the
               expenditure of the Restoration Fund.
               
               If the Tenant remains in the Premises beyond the expiration or 
               earlier termination of this Lease, such holding over shall be 
               without right and shall not be deemed to create any tenancy, but
               the Tenant shall be a tenant at sufferance only at a daily rate
               of rent equal to two (2) times the rent and other charges in
               effect under this Lease as of the day prior to the date of
               expiration of this Lease.
     6.1.10    Estoppel Certificate. Upon not less than fifteen (15) days' prior
               --------------------                         
               written request by ▇▇▇▇▇▇▇▇, to execute, acknowledge and deliver
               to Landlord a statement in writing certifying that this Lease is
               unmodified and in full force and effect and that to the best of
               its knowledge Tenant has no defenses, offsets or counterclaims
               against its obligations to pay the Fixed Rent and Additional Rent
               and any other charges and to perform its other covenants under
               this Lease (or, if there have been any modifications, that the
               Lease is in full force and effect as modified and stating the
               modifications and, if there are any defenses, offsets or
               counterclaims known to Tenant, setting them forth in reasonable
               detail), and the dates to which the Fixed Rent and Additional 
               Rent and other charges have been paid. Any such statement
               delivered pursuant to this subsection 6.1.10 may be relied upon
               by any prospective purchaser or mortgagee of the Premises, or any
               prospective assignee of such mortgage. Tenant shall also deliver
               to Landlord such publicly available financial information as to
               Tenant as may be reasonably required by Landlord to be provided
               to any mortgagee or prospective purchaser of the Premises.
6.2  Negative Covenants. Tenant covenants at all times during the term and such 
     ------------------      
     further time (prior or subsequent thereto) as Tenant occupies the Premises
     or any part thereof:
     6.2.1     Assignment and Subletting. Not to assign, transfer, mortgage or
               -------------------------
               pledge this Lease or to sublease (which term shall be deemed to
               include the granting of concessions and licenses and the like)
               all or any part of the Premises or suffer or permit this Lease or
               the leasehold estate hereby created or any other rights arising
               under this Lease to be assigned, transferred or encumbered, in
               whole or in part, whether voluntarily, involuntarily or by
               operation of law, or permit the occupancy of the Premises by
               anyone other than Tenant without the prior written consent of
               Landlord. In the event Tenant desires to assign this Lease or
               sublet any portion or all of the Premises, Tenant shall notify
               Landlord in writing of ▇▇▇▇▇▇'s intent to so assign this Lease or
               sublet the Premises and the proposed effective date of such
               subletting or assignment, and shall request in such notification
               that Landlord consent thereto. Landlord may terminate this Lease
               in the case of a proposed assignment, or suspend this Lease pro
               tanto for the period and with respect to the space involved in
               the case of a proposed subletting, by giving written notice of
               termination or suspension to Tenant, with such termination or
               suspension to be effective as of the effective date of such
               assignment or subletting. If Landlord does not so terminate or
               suspend Landlord's consent shall not be unreasonably withheld to
               an assignment during the original term of this Lease or to a
               subletting during the term of this Lease, provided that the
               assignee or subtenant shall use the Premises only for the
               Permitted Uses. Tenant shall, as Additional Rent, reimburse
               Landlord promptly for Landlord's reasonable legal expenses
               incurred in connection with any request by Tenant for such
               consent. If Landlord consents thereto, no such subletting of
               assignment shall in any way impair the continuing primary
               liability of Tenant hereunder, and no consent to any subletting
               or assignment in a particular instance shall be deemed to be a
               waiver of the obligation to obtain the Landlord's written
               approval in the case of any other subletting or assignment. With
               respect to any assignment or sublease during the original term of
               this Lease, such assignment shall not include the right granted
               to Tenant under Section 2.3 above to extend the term and such
               sublease shall be for a term expiring no later than the
               expiration of the original term of this Lease.
               The provisions of the preceding paragraph shall not apply to
               transactions with an entity into which or with which Tenant is
               merged or consolidated or to which substantially all of Tenant's
               assets are transferred or to any entity which controls or is
               controlled by or under common control with Tenant, provided that
               in any of such events (i) the successor to Tenant
                                       9
 
               has a net worth computed in accordance with generally accepted
               accounting principles at least equal to the net worth of Tenant
               immediately prior to such merger, consolidation or transfer, (ii)
               proof reasonably satisfactory to Landlord of such net worth shall
               have been delivered to Landlord at least ten (10) days prior to
               the effective date of any such transaction, and (iii) the
               assignee agrees directly with Landlord, by written instrument in
               form reasonably acceptable to Landlord, to perform all of the
               obligations of Tenant.
               If for any assignment or sublease consented to by Landlord
               hereunder ▇▇▇▇▇▇ receives rent or other consideration, either
               initially or over the term of the assignment or sublease, in
               excess of the rent called for hereunder, or in case of sublease
               of all or part, in excess of such rent fairly allocable thereto,
               after appropriate adjustments to assure that all other payments
               called for hereunder are appropriately taken into account and
               after deduction for reasonable expenses of Tenant in connection
               with the assignment or sublease, to pay to Landlord as additional
               rent fifty (50%) percent of the excess of each such payment of
               rent or other consideration received by Tenant promptly after its
               receipt.
               Whenever Tenant lists with a broker or brokers or otherwise
               advertises, holds out or markets the Premises or any part thereof
               for sublease or assignment, Tenant shall give ▇▇▇▇▇▇▇▇ Company,
               as brokers, a non-exclusive listing with respect to such
               sublease or assignment.
               If, at any time during the term of this Lease, there is a
               transfer of a controlling interest in the stock or general
               partnership interests of Tenant, and the transferee's intention
               is to liquidate or dissolve Tenant, Landlord may terminate this
               Lease by notice to Tenant within ninety (90) days thereafter, and
               Landlord shall thereupon be entitled to the remedies set forth in
               Section 8.2. The foregoing shall not apply, however, if the
               transferee's intention is to liquidate or dissolve Tenant into a
               parent of Tenant which shall be permitted upon compliance by the
               parent with the second paragraph of this Section 6.2.1.
     6.2.2     Overloading and Nuisance. Not to injure, overload the capacity of
               ------------------------
               the five inch (5") slab-on-grade floor of the Building, deface or
               otherwise harm the Premises; nor commit any nuisance; nor permit
               the emission of any objectionable noise or odor, nor make, allow
               or suffer any waste; nor make any use of the Premises which is
               improper, offensive or contrary to any law or ordinance or which
               will violate customary insurance requirements for office use; nor
               conduct any auction, fire, "going out of business" or bankruptcy
               sales. Landlord represents and warrants that the Premises shall
               be in compliance with all laws applicable to use of the Building
               for office use as of the Commencement Date.
     6.2.3     Hazardous Wastes and Materials. Not to dispose of any hazardous
               ------------------------------
               wastes, hazardous materials or oil on the Premises or the
               Property, or into any of the plumbing, sewage, or drainage
               systems thereon, except to the extent contained in normal office
               products which are used and disposed of in compliance with law,
               and to indemnify and save Landlord harmless from all claims,
               liability, loss or damage arising on account of the use or
               disposal of hazardous wastes, hazardous materials or oil at the
               Premises, including, without limitation, liability under any
               federal, state or local laws, requirements and regulations, or
               damage to any of the aforesaid systems. Subject to subsection
               5.1.6, Tenant shall comply with all governmental reporting
               requirements with respect to hazardous wastes, hazardous
               materials and oil, and shall deliver to Landlord copies of all
               reports filed with governmental authorities.
     6.2.4     Installation, Alterations or Additions. Not to make any
               --------------------------------------
               installations, alterations or additions in, to or on the Premises
               nor to permit the making of any holes (other than by small nails
               and screws for hanging pictures and the like) in the walls,
               partitions, ceilings or floors without on each occasion obtaining
               the prior written consent of Landlord, and then only pursuant to
               plans and specifications approved by Landlord in advance in each
               instance. Notwithstanding the foregoing, Tenant may, without the
               prior consent of Landlord, make nonstructural, interior
               installations or alterations not exceeding $5,000 in cost
               individually or $10,000 in the aggregate during any twelve (12)
               month period, provided that (a) the same do not impair the
               structural integrity of the Building, reduce its value, or
               involve modifications to the Building heating, ventilation or air
               conditioning systems or penetrations of the roof or exterior
               walls and (b) in each instance Tenant shall furnish Landlord with
               "as built" plans upon completion of such work. Tenant shall pay
               promptly when due the entire cost of any work to the premises
               undertaken by Tenant so that the Premises shall at all times be
               free of liens for labor and materials, and at Landlord's request
               Tenant shall furnish to Landlord a bond or other security
               acceptable to Landlord assuring that any work commenced by Tenant
               will be completed in accordance with the plans and specifications
               theretofore approved by Landlord and assuring that the Premises
               will remain free of any mechanics' lien or other encumbrance
               arising out of such work. In any event, Tenant shall forthwith
               bond against or discharge any mechanics' liens or other
               encumbrances that may arise out of such work. Tenant shall
               procure all necessary licenses and permits at Tenant's sole
               expense before undertaking such work. All such work shall be done
               in a good and workmanlike manner employing materials of good
               quality and so as to conform with all applicable zoning,
               building, fire, health and other codes, regulations, ordinances
               and laws. Tenant shall save Landlord harmless and indemnified
               from all injury, loss, claims or damage to any person or property
               occasioned by or growing out of such work.
               Not to grant a security interest in, or to lease, any personal
               property being installed in the Premises (including, without
               limitation, demountable partitions) without first obtaining an
               agreement, for the benefit of Landlord, from the secured party or
               lessor that such property will be removed within ten (10)
               business days after notice from Landlord of the expiration or
               earlier termination of this Lease and that a failure to so remove
               will subject such property to the provisions of subsection 6.1.9
               of the Lease.
     6.2.5     Signs. Not to place any signs on the Building or elsewhere on the
               -----
               Premises except for an identifying sign on the Building which may
               be installed subject to compliance with the Northwest Park sign
               policy and Landlord's prior written approval, which shall not be
               unreasonably withheld. Such sign shall be maintained in good
               repair by Tenant and shall conform to applicable requirements of
               public authorities. In any event, Tenant shall not place any
               signs on the Building or elsewhere on the Premises regarding
               availability of the Premises. ▇▇▇▇▇▇▇▇ agrees that no other signs
               will be placed on the Building or Premises except for directional
               signs in parking areas.
     6.2.6     Parking and Storage. Not to permit any storage of materials
               -------------------     
               outside of the Building; to use reasonable diligence to prevent
               Tenant's employees and customers and other persons visiting the
               Premises from using any street abutting the Premises for parking;
               and, not to permit the use of the Premises for either temporary
               or permanent storage of trucks, or for any use for which heavy
               trucking to or from the site would be customary.
               
                                   ARTICLE 7
                                   ---------
                              CASUALTY OR TAKING
                              ------------------
7.1  Termination. In the event that the Premises or the Building, or any 
     -----------
     material part thereof, shall be taken by any public authority or for any
     public use, or shall be destroyed or damaged by fire or casualty, or by the
     action of any public authority, then this Lease may be terminated at the
     election of Landlord. Such election, which may be made notwithstanding the
     fact that Landlord's entire interest may have been divested, shall be made
     by the giving of notice by Landlord to Tenant within sixty (60) days after
     the date of the
                                      10
 
               taking or casualty. In the event that the Premises or any
               material part thereof shall be destroyed or damaged by fire or
               casualty, or by the action of public authority, and cannot
               reasonably be expected to be repaired or restored within one
               hundred eighty (180) days (or ninety (90) days, if the damage
               occurs during the last year of the term) from the time that
               repair or restoration work would be commenced, then this Lease
               may be terminated at the election of Landlord or Tenant, which
               election shall be made by giving of notice to the other party
               within thirty (30) days after the date of damage or destruction.
               In the event (a) the remainder of the Premises after a partial
               taking is not reasonably sufficient for the operation of Tenant's
               business or (b) a taking results in a permanent loss of adequate
               parking available for use by Tenant (and Landlord does not elect
               to furnish substitute parking in a convenient location on or in
               close proximity to the Property), or a permanent deprivation of
               convenient access to the Premises, then Tenant may terminate this
               Lease by giving Landlord written notice of its election to do so
               within thirty (30) days after the date of such taking.
     7.2       Restoration. If no termination right is exercised by any party
               -----------
               having one under to Section 7.1 above, then this Lease shall
               continue in force and a just proportion of the rent reserved,
               according to the nature and extent of the damages sustained by
               the Premises, shall be suspended or abated until the Premises, or
               what may remain thereof, shall be put by Landlord in proper
               condition for use, which Landlord covenants to do with reasonable
               diligence to the extent permitted by the net proceeds of
               insurance recovered under the insurance carried by Landlord in
               accordance with Section 5.1.3.1 (or which could have been
               recovered if Landlord had carried such insurance, if not in fact
               carried by Landlord) plus the amount of any deductible thereunder
               which shall be funded by Landlord or damages awarded for such
               taking, destruction or damage and subject to zoning and building
               laws or ordinances then in existence. "Net proceeds of insurance
               recovered or damages awarded" refers to the gross amount of such
               insurance or damages less the reasonable expenses of Landlord
               incurred in connection with the collection of the same, including
               without limitation, fees and expenses for legal and appraisal
               services. From and after any restoration resulting from a
               permanent taking of part of the Premises, a just proportion of
               the rent reserved, according to the nature and extent of the
               damages sustained by the Premises shall be permanently abated.
     7.3       Award. Irrespective of the form in which recovery may be had by
               -----
               law, all rights to damages or compensation shall belong to
               Landlord in all cases. Except for any award made to Tenant for
               the personal property of Tenant and relocation expenses of
               Tenant, Tenant hereby grants to Landlord all of Tenant's rights
               to such damages and covenants to deliver such further assignments
               thereof as Landlord may from time to time request. Tenant hereby
               grants to Landlord all of Tenant's rights to such damages and
               covenants to deliver such further assignments thereof as Landlord
               may from time to time request.
                                   ARTICLE 8
                                   ---------
                                   DEFAULTS
                                   --------
     8.1       Events of Default. (a) If Tenant shall default in the performance
               -----------------
               of any of its obligations to pay the Fixed Rent or Additional
               Rent hereunder and if such default shall continue for ten (10)
               days after written notice from Landlord designating such default
               or if within thirty (30) days after written notice from Landlord
               to Tenant specifying any other default or defaults Tenant has not
               commenced diligently to correct the default or defaults so
               specified or has not thereafter diligently pursued such
               correction to completion, or (b) if any assignment shall be made
               by Tenant or any guarantor of Tenant for the benefit of
               creditors, or (c)) if Tenant's leasehold interest shall be taken
               on execution, or (d) if a lien or other involuntary encumbrance
               is filed against Tenant's leasehold interest or a material
               portion of Tenant's other property, including said leasehold
               interest, and is not discharged within twenty (20) days
               thereafter, or (e) if a petition is filed by Tenant or any
               guarantor of Tenant for liquidation, or for reorganization or an
               arrangement under any provisions of any bankruptcy law or code as
               then in force and effect, or (f) if an involuntary petition under
               any of the provisions of any bankruptcy law or code is filed
               against Tenant or any guarantor of Tenant and such involuntary
               petition is not dismissed within thirty (30) days thereafter,
               then, and in any of such cases, Landlord and the agents and
               servants of Landlord lawfully may, in addition to and not in
               derogation of any remedies for any preceding breach of covenant,
               immediately or at any time thereafter without demand or notice
               and with or without process of law (forcibly, if necessary) enter
               into and upon the Premises or any part thereof in the name of the
               whole or mail a notice of termination addressed to Tenant, and
               repossess the same as of landlord's former estate and expel
               Tenant and those claiming through or under Tenant and remove its
               and their effects (forcibly, if necessary) without being deemed
               guilty of any manner of trespass and without prejudice to any
               remedies which might otherwise be used for arrears of rent or
               prior breach of covenants, and upon such entry or mailing as
               aforesaid this Lease shall terminate, Tenant hereby waiving all
               statutory rights to the Premises (including without limitation
               rights of redemption, if any, to the extent such rights may be
               lawfully waived) and Landlord, without notice to Tenant, may
               store Tenant's effects, and those of any person claiming through
               or under Tenant, at the expense and risk of Tenant, and, if
               Landlord so elects, may sell such effects at public auction or
               private sale and apply the net proceeds to the payment of all
               sums due to Landlord from Tenant, if any, and pay over the
               balance, if any, to Tenant.
     8.2       Remedies. In the event that this Lease is terminated under any of
               --------
               the provisions contained in Section 8.1 or the last paragraph of
               subsection 6.2.1. Tenant covenants to pay forthwith to Landlord,
               as compensation, the excess of the total rent reserved for the
               residue of the term over the rental value of the Premises for
               said residue of the term. In calculating the rent reserved there
               shall be included in addition to the Fixed Rent and Additional
               Rent, the value of all other considerations agreed to be paid or
               performed by ▇▇▇▇▇▇ for said residue. Tenant further covenants as
               additional and cumulative obligations after any such termination,
               to pay punctually to Landlord all the sums and to perform all the
               obligations which Tenant covenants in this Lease to pay and to
               perform in the same manner and to the same extent and at the same
               time as if this Lease had not been terminated. In calculating the
               amounts to be paid by Tenant pursuant to the next preceding
               sentence Tenant shall be credited with any amount paid to
               Landlord as compensation as in this Section 8.2 provided and also
               with the net proceeds of any rent obtained by Landlord by
               reletting the Premises, after deducting all Landlord's expense in
               connection with such reletting, including, without limitation,
               all reasonable repossession costs, brokerage commissions, fees
               for legal services and expenses of preparing the Premises for
               such reletting, it being agreed by Tenant that Landlord may (i)
               relet the Premises or any part or parts thereof, for a term or
               terms which may at Landlord's option be equal to or less than or
               exceed the period which would otherwise have constituted the
               balance of the term and may grant such concessions and free rent
               as Landlord in its sole judgment considers advisable or necessary
               to relet the same and (ii) make such alterations, repairs and
               decorations in the Premises as Landlord in its sole judgment
               considers advisable or necessary to relet the same, and no action
               of Landlord in accordance with the foregoing or failure to
               relet or to collect rent under reletting shall operate or be
               construed to release or reduce Tenant's liability as aforesaid.
               In lieu of any other damages or indemnity and in lieu of full
               recovery by Landlord of all sums payable under all the foregoing
               provisions of this Section 8.2., Landlord may by written notice
               to Tenant, at any time after this Lease is terminated under any
               of the provisions contained in Section 8.1 or is otherwise
               terminated for breach of any obligation of Tenant and before such
               full recovery, elect to recover, and Tenant shall thereupon pay,
               as liquidated damages, an amount equal to the aggregate of the
               Fixed Rent and Additional Rent accrued in the twelve (12) months
               ended next prior to such termination plus the amount of rent of
               any kind accrued and unpaid at the time of termination and less
               the amount of any recovery by Landlord under the foregoing
               provisions of this Section 8.2 up to the time of payment of such
               liquidated damages. Nothing contained in this Lease shall,
               however, limit or prejudice the right of Landlord to prove for
               and obtain in proceedings for bankruptcy or insolvency by reason
               of the termination of this Lease, an amount equal to the maximum
               allowed by any statute or rule of law in effect at the time when,
               and governing the proceedings in
                                      11
 
     which, the damages are to be proved, whether or not the amount be greater
     than, equal to, or less than the amount of the loss or damages referred to
     above.
8.3  Remedies Cumulative. Any and all rights and remedies which Landlord may
     -------------------
     have under this Lease, and at law and equity, shall be cumulative and shall
     not be deemed inconsistent with each other, and any two or more of all such
     rights and remedies may be exercised at the same time insofar as permitted
     by law.
8.4  Landlord's Right to Cure Defaults. Landlord may, but shall not be obligated
     ---------------------------------
     to, cure, at any time, any default by Tenant under this Lease without
     notice in emergency situations, or otherwise if such default continues
     uncured for ten (10) days after notice to Tenant (or such longer period of
     time as may be reasonably required to cure such default, provided that
     Tenant commences to cure such default within such ten (10) day period and
     diligently prosecutes such cure to completion); and whenever Landlord so
     elects, all reasonable costs and expenses incurred by Landlord, including
     reasonable attorneys' fees, in curing a default shall be paid, as
     Additional Rent, by Tenant to Landlord on demand, together with lawful
     interest thereon from the date of payment by Landlord to the date of
     payment by Tenant.
8.5  Effect of Waivers of Default. Any consent or permission by either party to
     ----------------------------
     any act or omission which otherwise would be a breach of any covenant or
     condition herein by the other party, shall not in any way be held or
     construed (unless expressly so declared) to operate so as to impair the
     continuing obligation of any covenant or condition herein, or otherwise,
     except as to the specific instance, operate to permit similar acts or
     omissions.
8.6  No Waiver, etc. The failure of either party to seek redress for violation
     --------------
     of, or to insist upon the strict performance of, any covenant or condition
     of this Lease shall not be deemed a waiver of such violation nor prevent a
     subsequent act, which would have originally constituted a violation, from
     having all the force and effect of an original violation. The receipt by
     Landlord of rent with knowledge of the breach of any covenant of this Lease
     shall not be deemed to have been a waiver of such breach by Landlord. No
     consent or waiver, express or implied, by either party to or for any breach
     of any agreement or duty shall be construed as a waiver or consent to or of
     any other breach of the same or any other agreement or duty.
8.7  No Accord and Satisfaction. No acceptance by Landlord of a lesser sum than
     --------------------------   
     the Fixed Rent, Additional Rent or any other charge then due shall be
     deemed to be other than on account of the earliest installment of such rent
     or charge due, nor shall any endorsement or statement on any check or any
     letter accompanying any check or payment as rent or other charge be deemed
     an accord and satisfaction, and Landlord may accept such check or payment
     without prejudice to Landlord's right to recover the balance of each
     installment or pursue any other remedy in this Lease provided. No
     acceptance by Tenant of a lesser sum than any amount due from Landlord
     under this Lease shall be deemed to be other than on account of the total
     amount due, nor shall any endorsement or statement on any check or any
     letter accompanying any check or payment be deemed an accord and
     satisfaction, and Tenant may accept such check or payment (or make a larger
     payment, claimed by Landlord but contested by Tenant) without prejudice to
     Tenant's right to recover the balance of such amount or pursue any other
     remedy in this Lease provided.
                                   ARTICLE 9
                                   ---------
                          RIGHTS OF MORTGAGE HOLDERS
                          --------------------------
9.1  Rights of Mortgage Holders. The word "mortgage" as used herein includes
     --------------------------
     mortgages, deeds of trust or other similar instruments evidencing other
     voluntary liens or encumbrances, and modifications, consolidations,
     extensions, renewals, replacements and substitutes thereof. The word
     "holder" shall mean a mortgagee, and any subsequent holder or holders of a
     mortgage. Until the holder of a mortgage shall enter and take possession of
     the Property for the purpose of foreclosure, such holder shall have only
     such rights of Landlord as are necessary to preserve the integrity of this
     Lease as security. Upon entry and taking possession of the Property for the
     purpose of foreclosure, such holder shall have all the rights of Landlord.
     No such holder of a mortgage shall be liable either as mortgagee or as
     assignee, to perform, or be liable in damages for failure to perform, any
     of the obligations of Landlord unless and until such holder shall enter and
     take possession of the Property. Upon taking possession of the Property,
     such holder shall be liable to perform all of the obligations of Landlord,
     subject to and with the benefit of the provisions of Section 10.4, provided
     that a discontinuance of any foreclosure proceeding shall be deemed a
     conveyance under said provisions to the owner of the equity of the
     Premises.
     The covenants and agreements contained in this Lease with respect to the
     rights, powers and benefits of a holder of a mortgage (particularly,
     without limitation thereby, the covenants and agreements contained in this
     Section 9.1) constitute a continuing offer to any person, corporation or
     other entity, which by accepting a mortgage subject to this Lease, assumes
     the obligations herein set forth with respect to such holder; such holder
     is hereby constituted a party of this Lease as an obligee hereunder to the
     same extent as though its name were written hereon as such; and such holder
     shall be entitled to enforce such provisions in its own name. ▇▇▇▇▇▇ agrees
     on request of ▇▇▇▇▇▇▇▇ to execute and deliver from time to time any
     agreement which may be reasonably necessary to implement the provisions of
     this Section 9.1.
9.2  Lease Superior or Subordinate to Mortgages. It is agreed that the rights
     ------------------------------------------
     and interest of Tenant under this Lease shall be (i) subject or subordinate
     to any present or future mortgage or mortgages and to any and all advances
     to be made thereunder, and to the interest of the holder thereof in the
     Premises or any property of which the Premises are a part if Landlord shall
     elect by notice to Tenant to subject or subordinate the rights and interest
     of Tenant under this Lease to such mortgage or (ii) prior to any present or
     future mortgage or mortgages, if Landlord shall elect, by notice to Tenant,
     to give the rights and interest of Tenant under this Lease priority to such
     mortgage; in the event of either of such elections and upon notification by
     Landlord to that effect, the rights and interest of Tenant under this Lease
     should be deemed to be subordinate to, or have priority over, as the case
     may be, said mortgage or mortgages, irrespective of the time of execution
     or time of recording of any such mortgage or mortgages (provided that, in
     the case of subordination of this Lease to any future mortgages, the holder
     thereof agrees not to disturb the possession and to recognize the rights of
     Tenant hereunder so long as Tenant is not in default hereunder). ▇▇▇▇▇▇
     agrees it will, upon request of Landlord, execute, acknowledge and deliver
     any and all instruments reasonably deemed by Landlord necessary or
     desirable to give effect to or notice of such subordination or priority,
     provided such instruments are in form and on terms customarily agreed to by
     tenants in Massachusetts under similar circumstances. ▇▇▇▇▇▇ also agrees
     that if it shall fail at any time to execute, acknowledge and deliver any
     such instrument requested by Landlord within seven (7) business days after
     ▇▇▇▇▇▇▇▇'s request therefor, Tenant shall in terminable default under
     this Lease without any further notice or opportunity to cure under Section
     8.1 or otherwise. Any Mortgage to which this Lease shall be subordinated
     may contain such terms, provisions and conditions as the holder deems usual
     or customary. ▇▇▇▇▇▇▇▇ agrees to obtain from each holder of a present
     mortgage, if any, an agreement that the possession of Tenant will not be
     disturbed and ▇▇▇▇▇▇'s rights hereunder will be recognized so long as
     Tenant is not in default hereunder.
                                      12
 
                                  ARTICLE 10
                                  ----------
                           Miscellaneous Provisions
                           ------------------------
10.1      Notices from One Party to the Other. All notices required or permitted
          -----------------------------------
          hereunder shall be in writing and addressed, if to the Tenant, at the
          Original Notice Address of Tenant or such other address (which may
          include one additional address to receive a copy) as Tenant shall have
          last designated by notice in writing to Landlord and, if to Landlord,
          at the Original Notice Address of Landlord or such other address
          (which may include one additional address to receive a copy) as
          Landlord shall have last designated by notice in writing to Tenant.
          Any notice shall be deemed duly given when mailed to such address
          postage prepaid, by registered or certified mail, return receipt
          requested, or when delivered to such address by hand.
10.2      Quiet Enjoyment. Landlord agrees that upon ▇▇▇▇▇▇'s paying the rent
          ---------------
          and performing and observing the agreements, conditions and other
          provisions on its part to be performed and observed, Tenant shall and
          may peaceably and quietly have, hold and enjoy the Premises during the
          term hereof without any manner of hindrance or molestation from
          Landlord or anyone claiming under Landlord, subject, however, to the
          terms of this Lease; provided, however, Landlord reserves the right,
          without the same constituting a breach of Landlord's covenant of quiet
          enjoyment, to make such changes, alterations, additions, improvements,
          repairs or replacements in or to the Premises as Landlord may deem
          necessary or desirable, provided further, however, that there be no
          unreasonable interference with ▇▇▇▇▇▇'s use of the Premises or the
          parking therefor or access thereto or unreasonable impact on the
          appearance or operation of the Building.
10.3      Lease not to be Recorded. Tenant agrees that it will not record this
          ------------------------
          Lease. Both parties shall, upon the request of either, execute and
          deliver a notice or short form of this Lease in such form, if any, as
          may be permitted by applicable statute.
10.4      Limitation of Landlord's Liability. The term "Landlord" as used in
          ----------------------------------
          this Lease, so far as covenants or obligations to be performed by
          Landlord are concerned, shall be limited to mean and include only the
          owner or owners at the time in question of the Property, and in the
          event of any transfer or transfers of title to said property, the
          Landlord (and in case of any subsequent transfers or conveyances, the
          then grantor) shall be concurrently freed and relieved from and after
          the date of such transfer or conveyance, without any further
          instrument or agreement of all liability as respects the performance
          of any covenants or obligations on the part of the Landlord contained
          in this Lease thereafter to be performed, it being intended hereby
          that the covenants and obligations contained in this Lease on the part
          of Landlord, shall, subject as aforesaid, be binding on the Landlord,
          its successors and assigns, only during and in respect of their
          respective successive periods of ownership of said leasehold interest
          or fee, as the case may be. Tenant, its successors and assigns, shall
          not assert nor seek to enforce any claim for breach of this Lease
          against any of Landlord's assets other than Landlord's interest in the
          Property and in the rents, issues and profits thereof, and ▇▇▇▇▇▇
          agrees to look solely to such interest for the satisfaction of any
          liability or claim against Landlord under this Lease, it being
          specifically agreed that in no event whatsoever shall Landlord (which
          term shall include, without limitation, any general or limited
          partner, trustees, beneficiaries, officers, directors, or stockholders
          of Landlord) ever be personally liable for any such liability.
10.5      Acts of God. In any case where either party hereto is required to do
          -----------
          any act, delays caused by or resulting from Acts of God, war, civil
          commotion, fire, flood or other casualty, labor difficulties,
          shortages of labor, materials or equipment, government regulations,
          unusually severe weather, or other causes beyond such party's
          reasonable control shall not be counted in determining the time during
          which work shall be completed, whether such time be designated by a
          fixed date, a fixed time or a "reasonable time," and such time shall
          be deemed to be extended by the period of such delay.
10.6      Landlord's Default. Landlord shall not be deemed to be in default in
          ------------------
          the performance of any of its obligations hereunder unless it shall
          fail to perform such obligations and such failure shall continue for a
          period of thirty (30) days or such additional time as is reasonably
          required to correct any such default after written notice has been
          given by Tenant to Landlord specifying the nature of Landlord's
          alleged default. Landlord shall not be liable in any event for
          incidental or consequential damages to Tenant by reason of ▇▇▇▇▇▇▇▇'s
          default, whether or not notice is given.
          Tenant may, but shall not be obligated to, cure, after reasonable
          notice, any default by Landlord under this Lease that is detrimental
          to Tenant's business not to have cured and a court has ordered
          Landlord to cure, and whenever Tenant so elects, all costs and
          expenses incurred by Tenant in curing a default shall be paid by
          Landlord to Tenant on demand, together with lawful interest thereon
          from the date of payment by Tenant to the date of payment by Landlord;
          provided, however, that Tenant shall indemnify Landlord against
          damage to the Premises resulting from ▇▇▇▇▇▇'s effecting such cure.
10.7      Brokerage. Tenant warrants and represents that it has dealt with no
          ---------
          broker in connection with the consummation of this Lease, other than
          ▇▇▇▇▇▇▇▇ Company and ▇▇▇▇▇▇▇▇▇ & ▇▇▇▇, and in the event of any
          brokerage claims, other than by ▇▇▇▇▇▇▇▇ Company or ▇▇▇▇▇▇▇▇▇ & ▇▇▇▇,
          against Landlord predicated upon prior dealings with ▇▇▇▇▇▇, ▇▇▇▇▇▇
          agrees to defend the same and indemnify and hold Landlord harmless
          against any such claim.
10.8      Applicable Law and Construction. This Lease shall be governed by and
          -------------------------------
          construed in accordance with the laws of the Commonwealth of
          Massachusetts and, if any provisions of this Lease shall to any extent
          be invalid, the remainder of this Lease shall not be affected thereby.
          There are no oral or written agreements between Landlord and Tenant
          affecting this Lease. This Lease may be amended, and the provisions
          hereof may be waived or modified, only by instruments in writing
          executed by Landlord and ▇▇▇▇▇▇. The titles of the several Articles
          and Sections contained herein are for convenience only and shall not
          be considered in construing this Lease. Unless repugnant to the
          context, the words "Landlord" and "Tenant" appearing in this Lease
          shall be construed to mean those named above and their respective
          heirs, executors, administrators, successors and assigns, and those
          claiming through or under them respectively. If there be more than one
          tenant, the obligations imposed by this Lease upon Tenant shall be
          joint and several.
10.9      Expansion. At any time after the first year of the term, Tenant may
          ---------
          notify Landlord that Tenant desires to expand into 5,000 square feet
          or more of additional office space. Landlord will respond reasonably
          promptly to any such notice received from Tenant with what space (if
          any) is or is likely to become available in Northwest Park within the
          time frame required by Tenant and shall engage in discussions with
          Tenant in order to attempt to achieve agreement on mutually acceptable
          terms for any space so identified in which Tenant may be interested;
          provided that neither party shall have any responsibility or
          liability to the other party in the event that mutually acceptable
          terms cannot be agreed upon within a reasonable time.
                                      13
 
WITNESS the execution hereof under seal on the day and year first above written:
                         Landlord:
                         /s/ [SIGNATURE ILLEGIBLE]
                         ----------------------------------------
                         As Trustee, but not individually
                         /s/ ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                         ----------------------------------------
                         As Trustee, but not individually
                         /s/ [SIGNATURE ILLEGIBLE]          
                         ----------------------------------------
                         As Trustee, but not individually
                         Tenant:
                         INTERMETRICS, INC.
                         By: /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇
                             -------------------------------------
                         Its: Chief Executive Officer & Chairman
                             -------------------------------------
                                      14
                         
 
                                  EXHIBIT A
                               PLAN OF PROPERTY
                              [PLAN APPEARS HERE]
 
                                   EXHIBIT B
                                   ---------
                          COMMENCEMENT DATE AGREEMENT
                          ---------------------------
______________________ ("Landlord") and _____________________ ("Tenant") are 
parties to a lease ("Lease") dated _______________ of premises in a building 
known as _____________, Massachusetts. Landlord and Tenant hereby acknowledge 
and agree that the term of the Lease commenced on __________________ and will 
end on ___________________.
Executed under seal this ___________ day of _____________, 19__.
                                   Landlord:
                                   ____________________________________________
                                   As Trustee, but not individually
                                   Tenant:
                                   By _________________________________________
 
                                                                       EXHIBIT C
                                ▇▇▇▇▇▇▇▇'S WORK
                               ▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇
                                ▇▇▇▇▇▇▇▇▇▇, ▇▇
PART A
------
The Landlord, at its expense, will provide the following improvements in 
conformance with the plans and specifications by ▇▇▇▇▇▇ Architects, Inc. revised
to July 3, 1996:
DEMOLITION:         All interior partitions, ceilings, finishes and mechanical
                    and electrical equipment will be removed. The raised
                    computer room flooring will be disassembled and stored on
                    site for reuse. The existing glass and frames at the
                    exterior walls will be removed, and the slab, exterior walls
                    and roof steel will be demolished at the location of the new
                    entrance. The tank and chemical storage building will be
                    removed from the rear parking lot, and the parking area
                    restored.
ENTRANCE:           A new fully handicapped accessible, aluminum curtainwall and
                    glass entrance will be constructed at the northwest corner
                    of the building.
WINDOWS:            New aluminum frames and thermopane, Low-E, tinted glass
                    windows will be installed in locations as indicated on the
                    plan.
ROOF:               The existing roof will be removed and a new single-ply, EPDM
                    membrane system with 2 1/2" of insulation providing an R16
                    with a 10 year manufacturer's warrantee will be installed.
SKYLIGHTS:          A grouping of four 3' x 3' skylights will be installed in 
                    one location as indicated on the plan.
PARTITIONS:         The inside of the exterior walls will receive steel studs
                    16" on center with hat insulation and 1/2" gypsum wall board
                    to 12 feet above finished floor. Interior drywall partitions
                    for the bathroom core and electrical and sprinkler rooms
                    will be steel studs, 16" on center with 1/2" gypsum wall
                    board to the underside of the steel deck.
DOORS &:            The interior doors will be 3'-0" x 7'-0" solid-core cherry 
FRAMES              in hollow metal frames with standard lever hardware.
PAINTING:           Two coats of latex paint to be provided on all new drywall
                    and door frames. Doors and window ▇▇▇▇▇ will be stained
                    and/or clear sealed. Paint colors will coordinate with the
                    paint used for the Part B work and will be subject to the
                    tenant's approval.
HVAC:               A new, variable-air-volume system, consisting of three 
                    state-of-the-art 30-ton Trane rooftop units with electric
                    cooling and gas fired early warm up heating and 32 VAV boxes
                    containing two-stage electric heat will be provided. The
                    system is designed to provide adequate capacity for standard
                    office use and will be installed and distributed throughout
                    the building. Separate HVAC for the computer room is not
                    included in the Part A work.
CEILINGS:           A new 2' x 4' ▇▇▇▇▇▇▇▇▇ "Second Look" suspended ceiling will
                    be installed throughout.
                                  Page 1 of 2
 
LANDLORD'S WORK
PAGE 2
TILE:          Porcelain tile will be provided in the bathrooms and shower rooms
               on the floors and the walls and on the floor of the new lobby.
               VCT will be provided as required by the Tenant's floor plan.
CARPET:        New carpeting (allowance of $14.00 per installed yard) will be
               installed via the glued down method as indicated on the Tenant's
               floor plan. Carpet selection to be made by Tenant.
ELECTRICAL:    The existing main service (1600 amp main switch board at 120/208
               volt, 3 phase, 4 wire) will remain and be reused. New
               distribution panels and feeders will be installed for the HVAC
               system, lighting and utility power. New 18 cell parabolic
               fluorescent lighting will be installed throughout. At least one
               general duty duplex outlet will be installed on the exterior wall
               in each perimeter office.
PLUMBING:      New fixtures and related plumbing will be installed at the
               restroom core, including one handicapped accessible, fiberglass
               shower stall in each of the men's and woman's rooms.
SPRINKLER:     The sprinkler system will be put in good repair and re-
               distributed to meet the new floor plan and all code requirements.
FIRE ALARM:    A new fire alarm system will be installed in conformance with 
               current State and Town of Burlington code requirements.
PARKING:       The cracks in the parking lot will be filled, the lots sealed and
               the parking spaces re-lined.
LANDSCAPING:   The landscape plantings around the building will be replaced and
               general landscape improvements made to the site. A lawn
               irrigation system will be installed.
PART B
------
The Landlord will build out the rest of the premises that is not defined as 
Part A work in conformance with the plans and specifications revised to July 3, 
1996 by ▇▇▇▇▇▇ Architects, Inc.
Telephone and data wiring is not included in the Landlord's work.
                                  Page 2 of 2