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                                   L E A S E


  THIS INSTRUMENT IS A LEASE, dated as of January 30, 1998, in which the
Landlord and the Tenant are the parties hereinafter named, and which relates to
space in the building (the "Building") located at 400-2 Totten Pond Road,
Waltham, Massachusetts.  The parties to this instrument hereby agree with each
other as follows:


                                   ARTICLE 1
                                   ---------

                            BASIC LEASE PROVISIONS
                            ----------------------


1.1   INTRODUCTION.  The following set forth basic data and, where appropriate,
      ------------                                                             
      constitute definitions of the terms hereinafter listed.

1.2   BASIC DATA.
      ---------- 

      Landlord:  400/460 Totten Pond Road Limited Partnership, a Delaware
limited partnership.

      Landlord's Original Address:  c/o Leggat McCall Properties, L.P., 10 Post
Office Square, Boston, MA 02109.

      Tenant: LYCOS, INC., a Delaware corporation.

      Tenant's Original Address: 500 Old Connecticut Path, Framingham,
Massachusetts.

      Guarantor: None.

      Basic Rent:  Subject to the provisions of Sections 3.1 and 4.1, (i) for
the period commencing on the earliest Rent Commencement Date and expiring on the
day immediately preceding the first anniversary of the Area B Rent Commencement
Date of the entire Premises, as determined in accordance with Section 4.2,
$1,852,039.35 ($24.15 per square foot of Premises Rentable Area) per annum, (ii)
for the next twelve (12) months, $1,871,211.60 ($24.40 per square foot of
Premises Rentable Area) per annum, (iii) for the next twelve (12) months,
$1,890,383.85 ($24.65 per square foot of Premises Rentable Area) per annum, (iv)
for the next twelve (12) months, $1,909,556.10 ($24.90 per square foot of
Premises Rentable Area) per annum, and (v) for the remainder of the Initial
Term, $1,928,728.35 ($25.15) per square foot of Premises Rentable Area) per
annum, as all of the same may be adjusted and/or abated pursuant to Sections 3.2
and 12.1.

      Premises Rentable Area:  Agreed to be 76,689 square feet.

      Permitted Uses:  Executive or professional offices, of the type generally
found in first-class office buildings in the suburban Boston area, and customary
ancillary uses, subject to the provisions of Section 5.1(a).

      Escalation Factor:  With respect to (i) Park Costs (as defined in Exhibit
OC), 27%, (ii) 400 Costs, 50%, and (iii) Building Costs, 100%.

                                       1
<PAGE>
 
      Initial Term: The period commencing on the Commencement Date and expiring
at the close of the day immediately preceding the fifth anniversary of the Area
B Rent Commencement Date, as determined in accordance with Section 4.2, except
that if the Commencement Date shall be other than the first day of a calendar
month, the expiration of the Initial Term shall be at the close of the day on
the last day of the calendar month on which such anniversary shall fall, but in
no event later than September 30, 2003.

      Security Deposit: Not to exceed $1,466,677.13, and subject to reduction in
accordance with the provisions of Section 14.17. As of the date of execution
hereof by Tenant, according to the formula set forth in Section 14.17 and base
upon Tenant's current financial condition, the required security deposit is
$325,928.25.

      Base Operating Expenses: The actual Operating Expenses (as that term is
defined and determined in accordance with Section 9.1 and Exhibit OC) incurred
for the calendar year ending December 31, 1998, exclusive of (i) any operating
subsidies for the Cafeteria, and (ii) the cost of utilities provided to the
Building and the surrounding areas of the Property.

      Base Taxes: The actual Taxes assessed with respect to the fiscal year
ending June 30, 1999, as the same may be reduced by the amount of any abatement,
determined in accordance with Section 8.1.

      Broker: Lynch, Murphy Walsh & Partners, Inc., and Leggat McCall Properties
Management, L.P.


1.3   ADDITIONAL DEFINITIONS.
      ---------------------- 

      Agent:  Leggat McCall Properties Management, L.P., 460 Totten Pond Road,
Waltham, MA, Attn:  Property Manager, or such other person or entity from time
to time designated by Landlord.

      Business Days:  All days except Saturday, Sunday, New Year's Day, Martin
Luther King Day, President's Day, Patriots' Day, Memorial Day, Independence Day,
Labor Day, Columbus Day, Veterans' Day, Thanksgiving Day, Christmas Day (and the
following day when any such day occurs on Sunday).

      Commencement Date:  As determined in Section 4.1.

      Default of Tenant:  As defined in Section 13.1.

      Escalation Charges:  The amounts prescribed in Sections 8.1 and 9.2.

      Extended Term: As defined in Section 15.1.

      Fair Market Rental Value: As determined in accordance with Section 17.1.

      Force Majeure:  Collectively and individually, strike or other labor
trouble, fire or other casualty, governmental preemption of priorities or other
controls in connection with a national or other public emergency or shortages of
fuel, supplies or labor resulting therefrom, or any other cause, whether similar
or dissimilar, beyond Landlord's reasonable control.

      Initial Public Liability Insurance:  $3,000,000 per occurrence/$5,000,000
aggregate (combined single limit) for property damage, bodily injury or death.

                                       2
<PAGE>
 
      Landlord's Work: As defined in Section 4.1.

      Operating Expenses:  As determined in accordance with Section 9.1 and
                                                                           
Exhibit OC.
---------- 

      Operating Year:  As defined in Section 9.1.

      Premises:  Subject to Sections 2.2 and 3.2, the entire ground, second,
third and fourth floors of the Building.

      Property:  The Building and the land parcel on which it is located
(including adjacent sidewalks).

      Tax Year:  As defined in Section 8.1.

      Taxes:  As determined in accordance with Section 8.1.

      Tenant's Removable Property:  As defined in Section 5.2.

      Term of this Lease:  The Initial Term and any extension thereof in
accordance with the provisions hereof.

      TPR Properties: Properties owned by Landlord or an affiliate of Landlord
and currently known as 400-1, 400-2 and 460 Totten Pond Road, Waltham,
Massachusetts.


                                   ARTICLE 2
                                   ---------

                        PREMISES AND APPURTENANT RIGHTS
                        -------------------------------


2.1   LEASE OF PREMISES.  Landlord hereby demises and leases to Tenant for the
      -----------------                                                       
      Term of this Lease and upon the terms and conditions hereinafter set
      forth, and Tenant hereby accepts from Landlord, the Premises.

2.2   APPURTENANT RIGHTS AND RESERVATIONS.  (a)  Tenant shall have, as
      -----------------------------------                             
      appurtenant to the Premises, the non-exclusive right to use, and permit
      its invitees to use in common with others, public or common walkways
      necessary for access to the Building; but such rights shall always be
      subject to reasonable rules and regulations from time to time established
      by Landlord pursuant to Section 14.7 and to the right of Landlord to
      designate and change from time to time areas and facilities so to be used.

                                       3
<PAGE>
 
      (b) Excepted and excluded from the Premises are the structural elements of
      the Building, including without limitation the roof, exterior walls,
      foundations and exterior windows (except the inner surface thereof), and
      any space in the Premises used for shafts, stacks, pipes, conduits, fan
      rooms, ducts, electric or other utilities, sinks or other Building
      facilities, but the exterior entry doors (and related glass and finish
      work), interior partitions and doors, hung ceilings and lobby areas are a
      part thereof.  Landlord shall have the right to place in the Premises (but
      in such manner as to minimize to the extent reasonably practicable
      interference with Tenant's use of the Premises) interior storm windows,
      utility lines, equipment, stacks, pipes, conduits, ducts and the like.
      Landlord shall notify Tenant in advance of the installation of any such
      utility lines, stacks, pipes, conduits, ducts and the like so as to
      minimize any adverse impact on Tenant's business operations. In addition,
      but subject to Tenant's reasonable security restrictions set forth in
      Exhibit TS, Landlord and its agents, employees and contractors shall have
      ----------                                                               
      the right to pass through that portion of the Premises located on the
      ground floor of the Building to gain access to the basement of the
      Building. In the event that Tenant shall install any hung ceilings or
      walls in the Premises, Tenant shall install and maintain, as Landlord may
      require, proper access panels therein to afford access to any facilities
      above the ceiling or within or behind the walls.

      (c) Tenant shall also have the right (subject to reasonable rules and
      regulations from time to time established by Landlord) to use, on an non-
      exclusive, unreserved basis, up to four parking spaces located on the
      Property for each 1,000 square feet of Premises Rentable Area. Landlord
      shall not be responsible for policing the parking areas or for restricting
      access thereto by parties other than tenants of Landlord's buildings. Such
      spaces shall be used for private passenger automobiles only, and not for
      delivery trucks or other like vehicles.

                                       4
<PAGE>
 
                                   ARTICLE 3
                                   ---------

                      BASIC RENT; LANDLORD'S USE OF SPACE
                      -----------------------------------

3.1   PAYMENT.  (a) Tenant agrees to pay to Landlord, or as directed by
      -------                                                          
      Landlord, commencing on the Commencement Date without offset, abatement
      (except as provided in Section 12.1), deduction or demand, the Basic Rent.
      Such Basic Rent shall be payable in equal monthly installments, in
      advance, on the first day of each and every calendar month during the Term
      of this Lease, to Landlord at P.O. Box 3737, Boston, MA 02241-3737, or at
      such other place as Landlord shall from time to time designate by notice,
      in lawful money of the United States. In the event that any installment of
      Basic Rent is not paid within five (5) Business Days of when due, Tenant
      shall pay, in an addition to any charges under Section 14.18, at
      Landlord's request an administrative fee equal to 5% of the overdue
      payment. Landlord and Tenant agree that all amounts due from Tenant under
      or in respect of this Lease, whether labeled Basic Rent, Escalation
      Charges, additional charges or otherwise, shall be considered as rental
      reserved under this Lease for all purposes, including without limitation
      regulations promulgated pursuant to the Bankruptcy Code, and including
      further without limitation Section 502(b) thereof.

      (b)  Basic Rent for any partial month shall be pro-rated on a daily basis,
      and if the first day on which Tenant must pay Basic Rent shall be other
      than the first day of a calendar month, the first payment which Tenant
      shall make to Landlord shall be equal to a proportionate part of the
      monthly installment of Basic Rent for the partial month from the first day
      on which Tenant must pay Basic Rent to the last day of the month in which
      such day occurs, plus the installment of Basic Rent for the succeeding
      calendar month.


                                   ARTICLE 4
                                   ---------

                          COMMENCEMENT AND CONDITION
                          --------------------------


4.1   ACCESS AND COMMENCEMENT DATES. (a) Landlord and Tenant acknowledge that
      -----------------------------                                          
      two different Areas (described in paragraph (c) below) of the Premises,
      Area A and Area B, are being delivered to, and accepted by, Tenant at
      different times. As provided in Section 5.2, Tenant may desire to perform
      Tenant's Work therein to make the Premises more acceptable for Tenant's
      occupancy. Tenant may have access to Area A immediately upon execution of
      this Lease. The date on which Tenant first occupies all or any portion of
      Area A shall be the Commencement Date. The expiration of the Initial Term
      shall be based on the Area B Rent Commencement Date, which Date cannot be
      established with certainty as of the date hereof (but such expiration
      shall in no event be later than September 30, 2003). Tenant shall not be
      required to pay Basic Rent or Escalation Charges on account of Area A
      prior to the "Area A Rent Commencement Date," as hereafter defined.
      However, Tenant shall pay amounts due on account of utilities furnished to
      Area A during any occupancy.

                                       5
<PAGE>
 
      (b) Tenant acknowledges that Area B is currently occupied by an existing
      tenant, Molten Metal Technologies, Inc. ("Molten"), which is scheduled to
      vacate Area B on or before June 15, 1998. If Molten vacates Area B and
      delivers possession thereof to Landlord before June 15, 1998, Landlord
      shall so advise Tenant and Tenant shall have access to Area B for the
      purpose of performing Tenant's Work therein. Tenant may elect to accept
      possession of different portions of Area B at different times, and Tenant
      shall not be required to pay Basic Rent or Escalation Charges with respect
      to Area B until the Area B Rent Commencement Date; however, Tenant shall
      pay amounts due on account of utilities furnished to Area B during any
      occupancy. If Molten does not vacate Area B before June 15, 1998, then
      Landlord shall so advise Tenant and Tenant's access to Area B shall be
      delayed until the day after the day on which Molten delivers possession of
      Area B to Landlord. In the event that for any reason Landlord is unable to
      deliver possession of Area B to Tenant on or before July 16, 1998, then
      for each day thereafter that Landlord is unable so to deliver possession
      to Tenant, Tenant shall be granted one (1) day's credit of Basic Rent
      allocable to Area B.

      (c) The Premises contain 76,689 square feet of Premises Rentable Area. It
      is contemplated that Tenant will be able to have access to the Premises
      according to the following schedule:

 
          PROPOSED ACCESS DATE         FLOOR       SQUARE FEET
          -------------------------------------------------------
          The date hereof              First           1,414 
          ("Area A")                   Third          20,327 
                                       Fourth         20,327 
                                                             
          June 16, 1998                First          15,417 
          ("Area B")                   Second         19,204 
                                                      ------ 
                                                      76,689  

      Areas A and B are shown on Exhibit FP hereto. Although the Commencement
                                 ----------                                  
      Date will occur on the date on which Tenant first occupies any Area of the
      Premises for any purpose (including without limitation the performance of
      Tenant's Work, as hereinafter provided), it is understood and agreed that,
      until the date on which Tenant occupies any portion of Area B, the
      definition of "Premises" will include only Area A. Tenant shall be
      required to pay Basic Rent, Escalation Charges and all other charges
      hereunder for Area A as of that day (the "Area A Rent Commencement Date")
      which is the first to occur of (i) the first day on which Tenant occupies
      any portion of Area A for the conduct of Tenant's business, and (ii) March
      1, 1998. Tenant shall be required to pay Basic Rent, Escalation Charges
      and all other charges hereunder for Area B as of that day (the "Area B
      Rent Commencement Date") which is the first to occur of (i) the first day
      on which Tenant occupies any portion of Area B for the conduct of Tenant's
      business, and (ii) June 16, 1998 (or such later date on which Landlord
      shall first deliver possession of Area B to Tenant as hereinabove
      provided). If Landlord has not delivered possession of Area B to Tenant on
      or before June 15, 1998, the Area B Rent Commencement Date shall occur on
      June 16, 1998, regardless of whether Tenant shall have elected to accept
      possession of all or any portion thereof. If prior to June 16, 1998 Tenant
      occupies less than all of Area B for the conduct of Tenant's business,
      then the Basic Rent and Escalation Charges for Area B shall be prorated on
      the basis of square footage so occupied.

                                       6
<PAGE>
 
4.2   CONDITION OF PREMISES. The Premises are being leased in their condition AS
      ---------------------                                                     
      IS WITHOUT REPRESENTATION OR WARRANTY by Landlord (it being agreed that
      the foregoing shall not derogate from Landlord's repair obligations set
      forth in Section 7.1 hereof), provided that Landlord represents that as of
      the date hereof, the mechanical, electrical and plumbing systems located
      in and serving the Premises are in good working order and condition.
      Tenant acknowledges that it has inspected the Premises and has found the
      same satisfactory for their intended uses.

                                       7
<PAGE>
 
                                   ARTICLE 5
                                   ---------

                                USE OF PREMISES
                                ---------------


5.1   PERMITTED USE.  (a)  Tenant agrees that the Premises shall be used and
      -------------                                                         
      occupied by Tenant only for Permitted Uses specifically excluding, without
      limitation, use for medical, dental, governmental, utility company or
      employment agency offices.

      (b)  Tenant agrees to conform to the following provisions during the Term
      of this Lease:

          (i)  Tenant shall cause all freight to be delivered to or removed from
          the Premises in accordance with reasonable rules and regulations
          established by Landlord therefor;

          (ii)  Tenant will not place on the exterior of the Premises (including
          both interior and exterior surfaces of doors and interior surfaces of
          windows) or on any part of the Building outside the Premises, any
          signs, symbol, advertisement or the like visible to public view
          outside of the Premises. Notwithstanding the foregoing, Landlord
          agrees that, so long as Tenant leases not less than fifty-one percent
          (51%) of Premises Rentable Area, Tenant shall have the right to place
          two (2) signs bearing Tenant's name and logo, on the exterior of the
          Building, provided that (i) Tenant shall comply with all applicable
          laws, regulations and ordinances and shall obtain at its expense any
          necessary permits or approvals, and (ii) Landlord shall have first
          approved detailed plans and specifications therefor, which shall show,
          at a minimum, the size and style of such sign, the materials to be
          used, and the method of affixation. Tenant shall remove such signs
          (and repair any damage arising from such signs) upon the request of
          Landlord at the expiration or earlier termination of this Lease, or if
          Tenant shall cease to lease more than fifty-one percent (51%) of
          Premises Rentable Area. In addition, Landlord agrees to maintain at
          its expense a monument sign at the driveway entrance to the business
          park of which the Building is a part, on which will be placed Tenant's
          name (as well as the names of other tenants, if Landlord so chooses)
          and the location of the Premises. Tenant's name signage on such
          monument sign will not be entitled to a priority of placement or
          visibility over those of other tenants;

          (iii)  Tenant shall not perform any act or carry on any practice which
          may injure the Premises, or any other part of the Building, or cause
          any offensive odors or loud noise or constitute a nuisance or a menace
          to any other tenant or tenants or other persons;

          (iv)  Tenant shall, in its use of the Premises, comply with the
          requirements of all applicable governmental laws, rules and
          regulations, including without limitation the Americans With
          Disabilities Act of 1990; and

                                       8
<PAGE>
 
          (v)  Tenant (or its permitted sublessees or assignees) shall
          continuously throughout the Term of this Lease occupy the Premises for
          Permitted Uses.

      (b) Tenant acknowledges that the first floor of the Building contains a
      cafeteria as shown on Exhibit FP (the "Cafeteria"), which Tenant shall
                            ----------                                      
      operate during the Term of this Lease. From and after the Area B
      Commencement Date, the Cafeteria shall be operated by Tenant for the sole
      use and enjoyment of Tenant and its employees and invitees, and Tenant
      shall contract with a reputable and experienced operator of similar
      establishments, first approved in writing by Landlord, provided that
      Tenant may from time to time elect to change operators, and further
      provided that any such replacement operator shall be subject to the
      approval of Landlord, which shall not be unreasonably withheld or delayed.
      Between the Area A Commencement Date and the Area B Commencement Date,
      Tenant may operate the Cafeteria, but shall allow employees of Molten to
      use the same in common with Tenant. Tenant acknowledges that the Cafeteria
      contains furniture and kitchen and operating equipment (described on
                                                                          
      Exhibit KE), which is and shall remain the property of Landlord. Tenant
      ----------                                                             
      shall during the Term of this Lease be responsible for maintaining all
      such furniture and equipment in good and serviceable condition and repair,
      including without limitation repairing (but not replacing) the same if and
      as necessary. Provided that Tenant has properly maintained and repaired
      such equipment, Landlord shall be responsible for replacing the same if
      and as necessary.

      (c) Tenant acknowledges that Area B also contains a fitness facility (the
      "Gym") as shown on Exhibit FP, which Tenant's employees may use during the
                         ----------                                             
      Term of this Lease. From and after the Area B Commencement Date, the Gym
      shall be for the sole use and enjoyment of Tenant and its employees and
      invitees and the use and occupancy of the Gym by Tenant and its employees
      and invitees shall be at the sole risk of Tenant and/or such employees and
      invitees, and Landlord shall have no risk or obligation therefor. Except
      to the extent that the same arises from the negligent or wrongful act or
      omission of Landlord or its agents or contractors, Tenant expressly (i)
      releases Landlord, Landlord's mortgagee(s) from time to time, Landlord's
      Agent and their respective officers, directors, agents, employees and
      contractors, and each of them, of and from any and all damage, liability,
      responsibility, claims, counterclaims and causes of action arising
      directly or indirectly from or as a result of any bodily injury, property
      damage or death in connection with any use of the Gym; and (ii) agrees to
      indemnify and hold Landlord and each such released person(s) harmless from
      and against any loss, cost, damage or expense (including without
      limitation reasonable attorneys' fees) suffered by Landlord or any such
      released person(s) as a result of any use or occupancy of the Gym. As an
      ongoing condition to Landlord's permission to Tenant's use of the Gym,
      Tenant covenants with Landlord to maintain at all times a list of persons
      who are using, or who have requested permission to use, the Gym, and to
      keep on file for Landlord's inspection a duly executed and witnessed
      release and indemnification agreement from each such person, in the form
      attached hereto as Exhibit REL, or in such other form as Landlord may from
                         -----------                                            
      time to time approve or require. Tenant acknowledges that the Gym contains
      furniture and exercise equipment (described on Exhibit GE), which is and
                                                     ----------               
      shall remain the property of Landlord. Tenant shall during the Term of
      this Lease be responsible for maintaining all such furniture and equipment
      in good and serviceable condition and repair, including without limitation
      repairing (but not replacing) the same if and as necessary.

                                       9
<PAGE>
 
5.2   INSTALLATIONS AND ALTERATIONS BY TENANT.  (a)  Tenant shall make no
      ---------------------------------------                            
      alterations, additions (including, for the purposes hereof, wall-to-wall
      carpeting), or improvements in or to the Premises (including any
      improvements necessary for Tenant's initial occupancy of the Premises)
      without Landlord's prior written consent, which consent shall not be
      unreasonably withheld or delayed with respect to non-structural
      alterations, additions and improvements that do not affect the Building's
      electrical, plumbing or mechanical systems. Any such alterations,
      additions or improvements shall be in accordance with complete plans and
      specifications meeting the requirements set forth in the rules and
      regulations from time to time in effect and approved in advance by
      Landlord.  Such work shall (i) be performed in a good and workmanlike
      manner and in compliance with all applicable laws, (ii) be made at
      Tenant's sole cost and expense and in such a manner as Landlord may from
      time to time reasonably designate, (iii) be made only in accordance with
      the rules and regulations from time to time in effect with respect
      thereto, and (iv) become part of the Premises and the property of
      Landlord.  If any alterations or improvements shall involve the removal of
      fixtures, equipment or other property in the Premises which are not
      Tenant's Removable Property, such fixtures, equipment or property shall be
      promptly replaced by Tenant at its expense with new fixtures, equipment or
      property of like utility and of at least equal quality.

      (b) All articles of personal property and all business fixtures, machinery
      and equipment and furniture owned or installed by Tenant solely at its
      expense in the Premises ("Tenant's Removable Property") shall remain the
      property of Tenant and may be removed by Tenant at any time prior to the
      expiration of this Lease, provided that Tenant, at its expense, shall
      repair any damage to the Building caused by such removal.

      (c) Notice is hereby given that Landlord shall not be liable for any labor
      or materials furnished or to be furnished to Tenant upon credit, and that
      no mechanic's or other lien for any such labor or materials shall attach
      to or affect the reversion or other estate or interest of Landlord in and
      to the Premises.  To the maximum extent permitted by law, before such time
      as any contractor commences to perform work on behalf of Tenant, such
      contractor (and any subcontractors) shall furnish a written statement
      acknowledging the provisions set forth in the prior clause.  Whenever and
      as often as any mechanic's lien shall have been filed against the Property
      based upon any act or interest of Tenant or of anyone claiming through
      Tenant, Tenant shall forthwith take such action by bonding, deposit or
      payment as will remove or satisfy the lien.

                                       10
<PAGE>
 
      (d) Notwithstanding the foregoing, Landlord acknowledges that Tenant may
      desire to make certain alterations or improvements in the Premises from
      time to time to make the same more suitable for Tenant's occupancy
      ("Tenant's Work"). Such alterations or improvements may include tenant
      improvements to the Premises, and installation of fixtures (excluding
      furniture and equipment) in the Premises. All such Work shall be performed
      in a good and workmanlike manner, using first quality materials of recent
      manufacture, and shall be undertaken by Tenant in strict accordance with
      the applicable requirements of this Lease, and in accordance with
      applicable laws, codes, ordinances, permit or license conditions and
      regulations. As provided elsewhere in this Section 5.2, Tenant shall first
      prepare full plans and specifications reflecting such Tenant's Work, and
      shall submit the same to Landlord for review and approval prior to
      commencing any such Work. Landlord's approval thereof will not be
      unreasonably delayed or withheld. Each contractor retained by Tenant to
      perform Tenant's Work shall be subject to Landlord's prior review and
      approval, which will not be unreasonably delayed or withheld. With respect
      to any Tenant's Work that is completed in accordance with such
      requirements, Landlord shall make a contribution ("Landlord's
      Contribution") toward the actual cost thereof in an amount equal to the
      lesser of such actual cost or Four Dollars ($4.00) per square foot of
      Premises Rentable Area. Payments on account of Landlord's Contribution
      shall be made from time to time but not more frequently than monthly,
      against requisitions by Tenant, which shall specify in reasonable detail
      the work done and materials supplied, and shall be accompanied by
      receipted invoices showing the actual cost thereof, and lien waivers
      therefor. Any such requisition shall be presented to Landlord for payment.
      Landlord shall have no obligation to make any advance on account of
      Landlord's Contribution (i) to reimburse architectural, engineering or
      legal fees or expenses (or other so-called "soft" costs of construction),
      or (ii) if there exists any Default of Tenant or any event or circumstance
      which, with the giving of notice or the passage of time, or both, would
      constitute a Default of Tenant, it being agreed that Landlord may apply
      any payment of Landlord's Contribution toward curing such Default, or
      (iii) for Tenant's Work completed after the fourth anniversary of the
      first Commencement Date (unless, prior to such fourth anniversary, Tenant
      shall have validly extended the Term of this Lease for the Extended Term).

      (e) In the course of any work being performed by Tenant (including without
      limitation the "field installation" of any Tenant's Removable Property),
      Tenant agrees to use labor compatible with that being employed by Landlord
      for work in or to the Building or other buildings owned by Landlord or its
      affiliates (which term, for purposes of this Lease, shall include, without
      limitation, entities which control or are under common control with
      Landlord, or which are controlled by Landlord or, if Landlord is a
      partnership, by any partner of Landlord) and not to employ or permit the
      use of any labor or otherwise take any action which might result in a
      labor dispute involving personnel providing services in the Building
      pursuant to arrangements made by Landlord.

                                       11
<PAGE>
 
                                   ARTICLE 6
                                   ---------

                           ASSIGNMENT AND SUBLETTING
                           -------------------------

6.1   PROHIBITION.  (a) Except as expressly permitted in this Article 6, Tenant
      -----------                                                              
      covenants and agrees that whether voluntarily, involuntarily, by operation
      of law or otherwise neither this Lease nor the term and estate hereby
      granted, nor any interest herein or therein, will be assigned, mortgaged,
      pledged, encumbered or otherwise transferred and that neither the Premises
      nor any part thereof will be encumbered in any manner by reason of any act
      or omission on the part of Tenant, or used or occupied or permitted to be
      used or occupied, by anyone other than Tenant, or for any use or purpose
      other than a Permitted Use, or be sublet (which term, without limitation,
      shall include granting of concessions, licenses and the like) in whole or
      in part, or be offered or advertised for assignment or subletting. Without
      limiting the foregoing, any agreement pursuant to which: (x) Tenant is
      relieved from the obligation to pay, or a third party agrees to pay on
      Tenant's behalf, all or any portion of Basic Rent, Escalation Charges or
      other charges due under this Lease; and/or (y) a third party undertakes or
      is granted the right to assign or attempt to assign this Lease or sublet
      or attempt to sublet all or any portion of the Premises, shall for all
      purposes hereof be deemed to be an assignment of this Lease and subject to
      the provisions of this Article 6. Unless Tenant shall be a corporation
      whose stock is publicly traded on the New York or American Stock Exchange,
      or on the NASDAQ system or another nationally recognized securities
      exchange that is regulated by the Securities and Exchange Commission, the
      provisions of this paragraph (a) shall apply to a transfer (by one or more
      transfers) of twenty percent (20%) or more of the stock or partnership
      interests or other evidences of ownership of Tenant as if such transfer
      were an assignment of this Lease.

      (b) The provisions of paragraph (a) shall not apply to either:
      transactions with an entity into or with which Tenant is merged or
      consolidated, or to which substantially all of Tenant's assets are
      transferred; or transactions with any entity which controls or is
      controlled by Tenant or is under common control with Tenant; provided that
      in either such event:

          (i) the successor to Tenant has a net worth computed in accordance
          with generally accepted accounting principles consistently applied at
          least equal to the greater of (1) the net worth of Tenant immediately
          prior to such merger, consolidation or transfer, or (2) the net worth
          of Tenant herein named on the date of this Lease,

          (ii) proof satisfactory to Landlord of such net worth shall have been
          delivered to Landlord at least 10 days prior to the effective date of
          any such transaction, and

          (iii) the assignee agrees directly with Landlord, by written
          instrument in form satisfactory to Landlord, to be bound by all the
          obligations of Tenant hereunder including, without limitation, the
          covenant against further assignment and subletting.

                                       12
<PAGE>
 
      (c) Any consent by Landlord to a particular subletting or occupancy shall
      not in any way diminish the prohibition stated in paragraph (a) of this
      Section 6.1 or the continuing liability of the original named Tenant. No
      assignment or subletting hereunder shall relieve Tenant from its
      obligations hereunder and Tenant shall remain fully and primarily liable
      therefor.  No such assignment, subletting, or occupancy shall affect or be
      contrary to Permitted Uses. Any consent by Landlord to a particular
      assignment, subletting or occupancy shall be revocable, and any
      assignment, subletting or occupancy shall be void ab initio, if the same
      shall fail to require that such assignee, subtenant or occupant agree
      therein to be independently bound by and upon all of the covenants,
      agreements, terms, provisions and conditions set forth in this Lease on
      the part of Tenant to be kept and performed.

6.2   CONSENT TO SUBLEASE. Notwithstanding the prohibition set forth in Section
      --------------------                                                     
      6.1(a), in the event that Tenant shall desire to enter into any sublease
      of the Premises or any portion thereof, Tenant shall notify Landlord
      thereof, and (i) shall identify the proposed subtenant, (ii) shall state
      the proposed terms and conditions thereof, and (iii) shall identify the
      space proposed to be sublet. Provided that Landlord cannot or will not
      provide to such subtenant, within thirty (30) days after the proposed
      effective date of such sublease, reasonably comparable space in one of the
      TPR Properties on substantially comparable terms and conditions, then
      Landlord shall not withhold its consent to the subletting requested by
      Tenant, on the further conditions that:

          (i) The business of each proposed subtenant and its use of the
          Premises shall: (A) be consistent with the Permitted Uses; (B) in
          Landlord's good faith judgment, be in keeping with the standards of
          the Building and the surrounding office buildings; and (C) not violate
          any "exclusive use" right or other similar restriction theretofore
          granted to or in favor of any other tenant or occupant of any other
          building owned or operated by Landlord or any affiliate of Landlord.

          (ii) The proposed subtenant shall, in Landlord's reasonable judgment,
          be of good business character and reputation.

          (iii) Neither the proposed subtenant, nor any person who directly or
          indirectly, controls, is controlled by, or is under common control
          with, the proposed subtenant or any person who controls the proposed
          subtenant, shall be a government (or subdivision or agency thereof).
          In addition, neither the proposed subtenant, nor any person who
          directly or indirectly, controls, is controlled by, or is under common
          control with, the proposed subtenant or any person who controls the
          proposed subtenant, shall be an occupant of any TPR Property on the
          date such consent request is delivered, unless within ten (10) days
          after Landlord's receipt of Tenant's request for Landlord's consent,
          Landlord shall have notified Tenant that Landlord is unwilling or
          unable to accommodate such occupant's reasonable space requirements in
          another TPR Property;

          (iv) The form of the proposed sublease shall be reasonably
          satisfactory to Landlord and shall comply with the applicable
          provisions of this Article 6;

          (v) No proposed sublease shall cover less than 2,500 square feet of
          Premises Rentable Area or have a term of less than one (1) year; and

                                       13
<PAGE>
 
          (vi) not later than thirty (30) days prior to the proposed
          commencement of such sublease, Landlord shall have received
          information reasonably sufficient to determine compliance with the
          foregoing conditions.

          Moreover, notwithstanding such sublease, Tenant shall in all cases
          remain fully and primarily liable hereunder.

6.3   EXCESS PAYMENTS. In the event that Tenant shall enter into one or more
      ----------------                                                      
      subleases pursuant to Section 6.2, if the rent and other sums (including
      without limitation the fair value of any services provided by such
      subtenant for Tenant) on account of any such sublease exceed the Basic
      Rent and Escalation Charges allocable to that portion of the Premises
      subject to such sublease, plus actual out-of-pocket third party legal and
      brokerage expenses reasonably incurred and actually paid in connection
      with such sublease (such expenses to be pro-rated evenly over the term of
      such sublease, including any exercised options to extend or renew), Tenant
      shall pay to Landlord, as an additional charge, 50% of such excess, such
      amount to be paid monthly with payments by Tenant of Basic Rent hereunder.

6.4   TERMINATION. Notwithstanding any other provision of this Article VI to the
      ------------                                                              
      contrary, if and at each such time as Tenant shall intend to enter into
      any sublease, which sublease either (i) covers all or substantially all of
      the Premises, or (ii) covers less than all or substantially all of the
      Premises, but covers at least 2,500 square feet of Premises Rentable Area
      and has a term (including options to extend or renew) covering all or
      substantially all of the remainder of the Term of this Lease (excluding
      any extension options with respect to which Tenant shall not then have
      exercised its options), then Tenant shall give Landlord notice of such
      intent not earlier than sixty (60), and not later than thirty (30), days
      prior to the effective date of such proposed sublease, and Landlord may
      then elect to terminate this Lease (if less than all or substantially all
      of the Premises are covered by such sublease, then such termination shall
      affect only that portion of the Premises proposed to be covered by such
      sublease) by giving notice to Tenant of such election not later than
      thirty (30) days after receipt of Tenant's notice and, upon the giving of
      such notice by Landlord, this Lease shall terminate with respect to such
      portion thirty (30) days after the giving of such notice by Landlord with
      the same force and effect as if such date were the date originally set
      forth herein as the expiration date hereof. If Landlord shall elect to
      terminate this Lease with respect to any portion of the Premises as
      hereinabove provided, then from and after the effective date of such
      termination, the definitions of Basic Rent, Premises, Premises Rentable
      Area and Escalation Factor shall be adjusted to reflect that portion of
      the Premises that remains subject to this Lease after such termination.

6.5   MISCELLANEOUS. (a) Any sublease consented to by Landlord shall be
      --------------                                                   
      expressly subject and subordinate to all of the covenants, agreements,
      terms, provisions and conditions contained in this Lease.  Any proposed
      sub-sublease or proposed assignment of a sublease shall be subject to the
      provisions of this Article.  Tenant shall reimburse Landlord on demand, as
      an additional charge, for any out-of-pocket costs (including reasonable
      attorneys' fees and expenses, not to exceed $2,500) incurred by Landlord
      in connection with any actual or proposed assignment or sublease, whether
      or not consummated, including the costs of making investigations as to the
      acceptability of the proposed assignee or subtenant.  Any sublease to
      which Landlord gives its consent shall not be valid or binding on Landlord
      unless and until Tenant and the sublessee execute a consent agreement in
      form and substance reasonably satisfactory to Landlord.

                                       14
<PAGE>
 
      (b) Notwithstanding any sublease, or any amendments or modifications
      subsequent thereto, Tenant will remain fully liable for the payment of
      Basic Rent, Escalation Charges and other charges and for the performance
      of all other obligations of Tenant contained in this Lease.  Any act or
      omission of any subtenant, or of anyone claiming under or through any
      subtenant, that violates any of the obligations of this Lease shall be
      deemed a violation of this Lease by Tenant.

      (c) The consent by Landlord to any sublease shall not relieve Tenant or
      any person claiming through or under Tenant of the obligation to obtain
      the consent of Landlord, pursuant to the provisions of this Article, to
      any subsequent sublease.

      (d) With respect to each and every sublease authorized by Landlord under
      the provisions of this Article, it is further agreed that any such
      sublease shall provide that: (i) the term of the sublease must end no
      later than one day before the last day of the Term of this Lease; (ii) no
      sublease shall be valid, and no subtenant shall take possession of all or
      any part of the Premises until a fully executed counterpart of such
      sublease has been delivered to Landlord; (iii) each sublease shall provide
      that it is subject and subordinate to this Lease; (iv) Landlord may
      enforce the provisions of the sublease, including collection of rents; (v)
      in the event of termination of this Lease or reentry or repossession of
      the Premises by Landlord, Landlord may, at its option, take over all of
      the right, title and interest of Tenant, as sublessor, under such
      sublease, and such subtenant shall, at Landlord's option, attorn to
      Landlord but nevertheless Landlord shall not (A) be liable for any
      previous act or omission of Tenant under such sublease; (B) be subject to
      any defense or offset previously accrued in favor of the subtenant against
      Tenant; or (C) be bound by any previous modification of such sublease made
      without Landlord's written consent or by any previous prepayment of more
      than one month's rent.

6.6   ACCEPTANCE OF RENT. If this Lease is assigned, whether or not in violation
      -------------------                                                       
      of the provisions of this Lease, Landlord may collect rent and other
      charges from the assignee.  If all or any part of the Premises are sublet,
      whether or not in violation of this Lease, Landlord may collect rent and
      other charges from the subtenant.  In either event, Landlord may apply the
      net amount collected to payment of Basic Rent, Escalation Charges and
      other charges due in respect of this Lease, but no such assignment,
      subletting, or collection shall be deemed a waiver of any of the
      provisions of this Article, an acceptance of the assignee or subtenant as
      a lessee, or a release of Tenant from the performance by Tenant of
      Tenant's covenants and obligations under this Lease.
 

                                   ARTICLE 7
                                   ---------

            RESPONSIBILITY FOR REPAIRS AND CONDITION OF PREMISES; 
            ------------------------------------------------------
                     SERVICES TO BE FURNISHED BY LANDLORD
                     ------------------------------------

                                       15
<PAGE>
 
7.1   LANDLORD REPAIRS.  (a)  Except as otherwise provided in this Lease,
      ----------------                                                   
      Landlord agrees to keep in good order, condition and repair the roof,
      exterior walls (including exterior glass) and structure of the Building
      (including all plumbing, mechanical and electrical systems, but
      specifically excluding any supplemental heating, ventilation or air
      conditioning equipment or systems installed by Tenant or at Tenant's
      request or as a result of Tenant's requirements in excess of building
      standard design criteria), all insofar as they affect the Premises, except
      that Landlord shall in no event be responsible to Tenant for the repair of
      glass in the Premises, the entry doors (or related glass and finish work)
      leading to the Premises, or any condition in the Premises or the Building
      caused by any act or neglect of Tenant, its agents, employees, invitees or
      contractors. Landlord shall not be responsible to make any improvements or
      repairs to the Building other than as expressly in this Section 7.1
      provided, unless expressly provided otherwise in this Lease.

      (b) Landlord shall never be liable for any failure to make repairs which
      Landlord has undertaken to make under the provisions of this Section 7.1
      or elsewhere in this Lease, unless Tenant has given notice to Landlord of
      the need to make such repairs, and Landlord has failed to commence to make
      such repairs within a reasonable time after receipt of such notice, or
      Landlord thereafter fails to proceed with reasonable diligence to complete
      such repairs.

      (c) If Landlord shall be required to make any repairs or alterations to
      the Premises to comply with any laws and requirements of public
      authorities hereafter in effect, or with any directions, rules or
      regulations of governmental agencies having or purporting to have
      jurisdiction, and if the cost to Landlord of making such repairs or
      alterations, together with the cost of other such repairs or alterations
      theretofore required, would exceed an amount equal to twelve months' Basic
      Rent in the aggregate, Landlord may (but shall not be required to) elect
      to terminate this Lease by giving Tenant notice of its desire to do so,
      which notice shall set forth a date not less than thirty days from the
      giving of such notice on which this Lease shall terminate with the same
      force and effect as if such date were the date originally set forth herein
      as the expiration hereof.  Tenant may, however, void Landlord's election
      to so terminate this Lease by giving Landlord notice, within fifteen days
      after the date of Landlord's notice to Tenant, to the effect that Tenant
      shall, at Tenant's expense, promptly and diligently cause all such repairs
      or alterations to be performed in the Premises, and Tenant shall hold
      Landlord harmless from and against any and all costs, expenses, penalties
      and/or liabilities (including without limitation reasonable legal fees and
      costs) in connection therewith.


                                      16
<PAGE>
 
7.2   TENANT'S AGREEMENT.  (a) Tenant will keep neat and clean and maintain in
      ------------------                                                      
      good order, condition and repair the Premises and every part thereof,
      excepting only those repairs for which Landlord is responsible under the
      terms of this Lease, reasonable wear and tear of the Premises, and damage
      by fire or other casualty or as a consequence of the exercise of the power
      of eminent domain; and shall surrender the Premises, at the end of the
      Term, in such condition. Tenant acknowledges that Tenant has requested
      that Landlord not provide daily cleaning services, on the condition that
      Tenant will do so at its own cost and expense. Tenant shall, on or before
      the date hereof, enter into and maintain in full force and effect
      throughout the Term of this Lease, one or more cleaning contracts with
      Prospect Cleaning Company or another reputable contractor(s) first
      approved by Landlord, which approval will not be unreasonably withheld or
      delayed. Tenant shall pay all sums from time to time due in respect of
      such contract(s), and shall provide copies thereof to Landlord on request.
      All trash and refuse removed from the Premises shall be placed, treated
      and disposed of in accordance with Landlord's rules and regulations from
      time to time in effect. Without limitation of any of the foregoing, Tenant
      shall continually during the Term of this Lease maintain the Premises in
      accordance with all laws, codes and ordinances from time to time in effect
      and all directions, rules and regulations of the proper officers of
      governmental agencies having jurisdiction, and the standards recommended
      by the Boston Board of Fire Underwriters, and shall, at Tenant's expense,
      obtain all permits, licenses and the like required by applicable law for
      the conduct of Tenant's particular business (it being understood that
      Tenant shall not be required to make any changes or improvements to the
      Premises in order to comply with requirements applicable to office
      buildings generally in the area in which the Property is located). To the
      extent that the Premises constitute a "Place of Public Accommodation"
      within the meaning of the Americans With Disabilities Act of 1990, Tenant
      shall be responsible, subject to the requirements of Section 5.2, for
      making the Premises comply with such Act. Notwithstanding the foregoing or
      the provisions of Article 12, but subject to the provisions of Section
      14.20, to the maximum extent this provision may be enforceable according
      to law, Tenant shall be responsible for the cost of repairs which may be
      made necessary by reason of damage to the Building caused by any act or
      neglect of Tenant, or its contractors or invitees (including any damage by
      fire or other casualty arising therefrom) and, if the premium or rates
      payable with respect to any policy or policies of insurance purchased by
      Landlord or Agent with respect to the Property increases as a result of
      payment by the insurer of any claim arising from the any act or neglect of
      Tenant, or its contractors or invitees, Tenant shall be pay such increase,
      from time to time, within fifteen (15) days after demand therefor by
      Landlord, as an additional charge.

      (b) If repairs are required to be made by Tenant pursuant to the terms
      hereof, Landlord may demand that Tenant make the same forthwith, and if
      Tenant refuses or neglects to commence such repairs and complete the same
      with reasonable dispatch, after such demand (except in the case of an
      emergency, in which event Landlord may make such repairs immediately),
      Landlord may (but shall not be required to do so) make or cause such
      repairs to be made (the provisions of Section 14.18 being applicable to
      the costs thereof), and shall not be responsible to Tenant for any loss or
      damage whatsoever that may accrue to Tenant's business or possessions by
      reason thereof.


                                      17
<PAGE>
 
7.3   FLOOR LOAD - HEAVY MACHINERY. (a)  Tenant shall not place a load upon any
      ----------------------------                                             
      floor in the Premises exceeding the floor load per square foot of area
      which such floor was designed to carry and which is allowed by law.
      Landlord reserves the right to prescribe the weight and position of all
      business machines and mechanical equipment, including safes, which shall
      be placed so as to distribute the weight. Business machines and mechanical
      equipment shall be placed and maintained by Tenant at Tenant's expense in
      settings sufficient, in Landlord's judgment, to absorb and prevent
      vibration, noise and annoyance.  Tenant shall not move any safe, heavy
      machinery, heavy equipment, freight, bulky matter or fixtures into or out
      of the Building without Landlord's prior consent, which consent may
      include a requirement to provide insurance, naming Landlord as an insured,
      in such amounts as Landlord may deem reasonable.

      (b) If any such safe, machinery, equipment, freight, bulky matter or
      fixtures requires special handling, Tenant agrees to employ only persons
      holding a Master Rigger's License to do such work, and that all work in
      connection therewith shall comply with applicable laws and regulations.
      Any such moving shall be at the sole risk and hazard of Tenant, and Tenant
      will exonerate, indemnify and save Landlord harmless against and from any
      liability, loss, injury, claim or suit resulting directly or indirectly
      from such moving.

7.4   BUILDING SERVICES.  (a) Landlord shall furnish, 24 hours per day, 7 days
      -----------------                                                       
      per week, heating and cooling as normal seasonal changes may require to
      provide reasonably comfortable space temperature and ventilation for
      occupants of the Premises under normal business operation at an occupancy
      of not more than one person per 150 square feet of Premises Rentable Area
      and an electrical load not exceeding 3.0 watts per square foot of Premises
      Rentable Area. In the event Tenant introduces into the Premises personnel
      or equipment which overloads the capacity of the Building system or in any
      other way interferes with the system's ability to perform adequately its
      proper functions, supplementary systems may, if and as needed, at
      Landlord's option (but after consultation with Tenant), be provided by
      Landlord, at Tenant's expense.

      (b) Landlord shall also provide:

          (i)  Passenger elevator service from the existing passenger elevator
          system.

          (ii) Domestic water service (at temperatures supplied by the city in
          which the Property is located) for drinking, lavatory and toilet
          purposes, and connection to the municipal sewer system.

          (iii)  Snow and ice removal to the walks, driveways and parking areas
          which Tenant is entitled to use under this Lease, and landscaping of
          the surrounding grounds.

          (iv)  Free access to the Premises at all times, subject to security
          precautions from time to time in effect, and subject always to
          restrictions based on emergency conditions.


                                      18
<PAGE>
 
      (c) Landlord shall have no obligation whatsoever to provide any security
      for the Premises or the Property. If and to the extent that Tenant desires
      to provide security for the Premises or for Tenant's employees and
      invitees or their property, Tenant shall be responsible for so doing.
      Tenant agrees that, as between Landlord and Tenant, it is Tenant's
      responsibility to advise its agents, employees, contractors and invitees
      as to the foregoing and as to necessary and appropriate safety
      precautions. Without in any way limiting the operation of Article 10
      hereof, Tenant, for itself and its agents, employees, contractors and
      invitees, hereby expressly waives any claim, action, cause of action or
      other right which may accrue or arise against Landlord as a result of any
      damage or injury to the person or property of Tenant or any such agent,
      invitee, contractor or employee, except to the extent that the same arises
      from the negligent act or omission of Landlord or its agents, employees or
      contractors, and will indemnify and hold Landlord harmless from and
      against any loss, cost, damage or expense suffered by Landlord as a result
      of any such claim, action, cause of action or other right.

7.5   UTILITIES.  Tenant acknowledges that Basic Rent does not include the cost
      ---------                                                                
      of providing any utilities to the Premises and the Property (including
      without limitation the cost of providing parking lot and other exterior
      lighting and the cost of water for landscaping irrigation on the
      Property). Tenant shall pay for all utilities provided separately to the
      Premises and, in addition, Tenant shall pay one-half (?) of the cost of
      providing parking lot and other exterior lighting and the cost of water
      for landscaping irrigation on the Property and the adjacent property on
      which 400-1 Totten Pond Road is located. Landlord shall arrange for
      Tenant's reasonable and customary requirements for utilities, including,
      but not limited to, gas, water, electricity, sewer charges, and the like,
      including all utilities necessary for heating and air-conditioning the
      Building and the Premises, and Tenant shall reimburse Landlord for the
      costs and expenses incurred in connection therewith, as an additional
      charge, within thirty (30) days after receipt of Landlord's invoice
      therefor. Landlord shall have no liability for interruption or
      unavailability of any utility or service. Tenant shall purchase and
      install, at its expense, all lamps, tubes, bulbs, starters and ballasts
      for the Premises, and shall operate the utility systems for only their
      intended uses, consistent with accepted building operating standards.


                                   ARTICLE 8
                                   ---------

                               REAL ESTATE TAXES
                               -----------------


8.1   PAYMENTS ON ACCOUNT OF REAL ESTATE TAXES.  (a)  For the purposes of this
      ----------------------------------------                                
      Article, the term "Tax Year" shall mean the twelve-month period commencing
      on the July 1 immediately preceding the Commencement Date and each twelve-
      month period thereafter commencing during the Term of this Lease; and the
      term "Taxes" shall mean an amount equal to fifty percent (50%) of real
      estate taxes assessed with respect to the Property and 400-1 Totten Pond
      Road for any Tax Year commencing with the Tax Year ending on June 30,
      1999. If the Property shall hereafter be assessed as a taxable parcel
      separate and apart from 400-1 Totten Pond Road, then 100% thereof shall be
      included in the definition of "Taxes."

      (b) In the event that for any reason, Taxes during any Tax Year commencing
      on or after July 1, 1999 shall exceed Base Taxes, Tenant shall pay to
      Landlord, as an Escalation Charge, an amount equal to (i) the excess of
      Taxes over Base Taxes for such Tax Year, multiplied by (ii) the Escalation
      Factor, such amount to be apportioned for any portion of a Tax Year in
      which the Commencement Date falls or the Term of this Lease ends.


                                      19
<PAGE>
 
      (c) Estimated payments by Tenant on account of Taxes shall be made,
      commencing July 1, 1999, on the first day of each and every calendar month
      during the Term of this Lease, in the fashion herein provided for the
      payment of Basic Rent.  The monthly amount so to be paid to Landlord shall
      be sufficient to provide Landlord by the time real estate tax payments are
      due with a sum equal to Tenant's required payments, as estimated by
      Landlord from time to time, on account of Taxes for the then current Tax
      Year.  Promptly after receipt by Landlord of bills for such Taxes,
      Landlord shall advise Tenant of the amount thereof and the computation of
      Tenant's payment on account thereof.  If estimated payments theretofore
      made by Tenant for the Tax Year covered by such bills exceed the required
      payments on account thereof for such Year, Landlord shall credit the
      amount of overpayment against subsequent obligations of Tenant on account
      of Basic Rent (or refund such overpayment if the Term of this Lease has
      ended and Tenant has no further obligation to Landlord); but if the
      required payments on account thereof for such Year are greater than
      estimated payments theretofore made on account thereof for such Year,
      Tenant shall make payment to Landlord within 30 days after being so
      advised by Landlord.

8.2   ABATEMENT.  If Landlord shall receive any tax refund or reimbursement of
      ---------                                                               
      Taxes or sum in lieu thereof with respect to any Tax Year, then out of any
      balance remaining thereof after deducting Landlord's expenses reasonably
      incurred in obtaining such refund, Landlord shall pay to Tenant, provided
      there does not then exist a Default of Tenant of the sort described in
      Section 13.1(a)(i), an amount equal to such refund or reimbursement or sum
      in lieu thereof (together with Tenant's share of any interest actually
      received by Landlord in connection with such abatement) multiplied by the
      Escalation Factor; provided, that in no event, shall Tenant be entitled to
      receive more than the payments made by Tenant on account of Taxes for such
      Tax Year pursuant to paragraph (b) of Section 8.1 or to receive any
      payments or abatement of Basic Rent if Taxes for any year are less than
      Base Taxes or Base Taxes are abated.

8.3   ALTERNATE TAXES.  (a)  If some method or type of taxation shall replace
      ---------------                                                        
      the current method of assessment of real estate taxes in whole or part, or
      the type thereof, or if additional types of taxes are imposed upon the
      Property or Landlord, Tenant agrees that such taxes or other charges shall
      be deemed to be, and shall be, Taxes hereunder and Tenant shall pay an
      equitable share of the same as an additional charge computed in a fashion
      consistent with the method of computation herein provided, to the end that
      Tenant's share thereof shall be, to the maximum extent practicable,
      comparable to that which Tenant would bear under the foregoing provisions.

      (b) If a tax (other than a Federal or State net income tax) is assessed on
      account of the rents or other charges payable by Tenant to Landlord under
      this Lease, Tenant agrees to pay the same as an additional charge within
      ten (10) days after billing therefor, unless applicable law prohibits the
      payment of such tax by Tenant.


                                   ARTICLE 9
                                   ---------

                        OPERATING AND UTILITY EXPENSES
                        ------------------------------


9.1   DEFINITIONS.  For the purposes of this Article, the following terms shall
      -----------                                                              
      have the following respective meanings:


                                      20
<PAGE>
 
      Operating Year:  Each calendar year in which any part of the Term of this
      Lease shall fall.

      Operating Expenses:  aggregate costs or expenses reasonably incurred by
      Landlord with respect to the operation, administration, cleaning, repair,
      maintenance and management of the Premises and the Property, all as set
      forth in Exhibit OC annexed hereto: Tenant acknowledges that the Building
               ----------                                                      
      is a part of a larger office park comprising the TPR Properties, and that
      some costs of operating the TPR Properties are chargeable to the Building.
      If during any portion of any Operating Year for which Operating Expenses
      are being computed, less than all of the TPR Properties are occupied by
      tenants or if Landlord was not supplying all tenants with the services
      being supplied to Tenant hereunder, actual Operating Expenses incurred
      shall be reasonably extrapolated by Landlord on an item-by-item basis to
      the reasonable Operating Expenses that would have been incurred if the TPR
      Properties were fully occupied and such services were being supplied to
      all tenants, and such extrapolated Operating Expenses shall, for all
      purposes hereof, be deemed to be the Operating Expenses for such Operating
      Year.

9.2   TENANT'S PAYMENTS.  (a)  In the event that, for any Operating Year,
      -----------------                                                  
      Operating Expenses shall exceed Base Operating Expenses, Tenant shall pay
      to Landlord, as an Escalation Charge, an amount equal to (i) such excess
      Operating Expenses multiplied by (ii) the Escalation Factor, such amount
      to be apportioned for any portion of an Operating Year in which the
      Commencement Date falls or the Term of this Lease ends.

      (b) Estimated payments by Tenant on account of Operating Expenses shall be
      made, commencing January 1, 1999, on the first day of each and every
      calendar month during the Term of this Lease, in the fashion herein
      provided for the payment of Basic Rent.  The monthly amount so to be paid
      to Landlord shall be sufficient to provide Landlord by the end of each
      Operating Year a sum equal to Tenant's required payments, as estimated by
      Landlord from time to time during each Operating Year, on account of
      Operating Expenses for such Operating Year.  After the end of each
      Operating Year, Landlord shall submit to Tenant a reasonably detailed
      accounting of Operating Expenses for such Year, and Landlord shall certify
      to the accuracy thereof.  If estimated payments theretofore made for such
      Year by Tenant exceed Tenant's required payment on account thereof for
      such Year, according to such statement, Landlord shall credit the amount
      of overpayment against subsequent obligations of Tenant with respect to
      Basic Rent (or refund such overpayment if the Term of this Lease has ended
      and Tenant has no further obligation to Landlord); but, if the required
      payments on account thereof for such Year are greater than the estimated
      payments (if any) theretofore made on account thereof for such Year,
      Tenant shall make payment to Landlord within 30 days after being so
      advised by Landlord.  Landlord shall have the same rights and remedies for
      the nonpayment by Tenant of any payments due on account of Operating
      Expenses as Landlord has hereunder for the failure of Tenant to pay Basic
      Rent.


                                  ARTICLE 10
                                  ----------

                   INDEMNITY AND PUBLIC LIABILITY INSURANCE
                   ----------------------------------------


                                      21
<PAGE>
 
10.1  INDEMNITY.  (a) Except to the extent that such claims arise from the
      ---------                                                           
      negligent or wrongful acts or omissions of Landlord or Landlord's agents
      or employees, and without in any way limiting the provisions of Sections
      5.1(c) and 7.4(c), Tenant agrees to indemnify and save harmless Landlord
      from and against all claims, loss, cost, damage or expense of whatever
      nature arising: (i) from any accident, injury or damage whatsoever to any
      person, or to the property of any person, occurring in or about the
      Premises; (ii) from any accident, injury or damage occurring outside of
      the Premises but on the Property where such accident, damage or injury
      results or is claimed to have resulted from an act or omission on the part
      of Tenant or Tenant's agents or employees or independent contractors; or
      (iii) in connection with the conduct or management of the Premises or of
      any business therein, or any thing or work whatsoever done, or any
      condition created (other than by Landlord or its agents or employees) in
      or about the Premises; and, in any case, occurring after the date of this
      Lease until the end of the Term of this Lease and thereafter so long as
      Tenant is in occupancy of any part of the Premises.  This indemnity and
      hold harmless agreement shall include indemnity against all losses, costs,
      damages, expenses and liabilities incurred in or in connection with any
      such claim or proceeding brought thereon, and the defense thereof,
      including, without limitation, reasonable attorneys' fees and costs at
      both the trial and appellate levels.

      (b) Landlord agrees to indemnify and save harmless Tenant from and against
      all claims, loss, cost, damage or expense of whatever nature arising from
      any accident, injury or damage, to the extent that such accident, damage
      or injury results from an act or omission on the part of Landlord or
      Landlord's agents or employees and occurring after the date of this Lease
      until the end of the Term of this Lease. This indemnity and hold harmless
      agreement shall include indemnity against all losses, costs, damages,
      expenses and liabilities incurred in or in connection with any such claim
      or proceeding brought thereon, and the defense thereof, including, without
      limitation, reasonable attorneys' fees and costs at both the trial and
      appellate levels.

      (c) When any claim of the sort described in paragraphs (a) and (b) above
      is the result of the jointly negligent or wrongful act or omission on the
      part of the indemnifying party and a third party unrelated to the
      indemnifying party (other than the indemnifying party's agents or
      employees), then the indemnification obligation shall be in proportion to
      the indemnifying party's allocable share of the joint negligence or
      wrongful conduct.

10.2  PUBLIC LIABILITY INSURANCE.  Tenant agrees to maintain in full force from
      --------------------------                                               
      the date upon which Tenant first enters the Premises for any reason,
      throughout the Term of this Lease, and thereafter so long as Tenant is in
      occupancy of any part of the Premises, a policy of commercial general
      liability and property damage insurance (including broad form contractual
      liability, independent contractor's hazard and completed operations
      coverage) under which Tenant is named as an insured and Landlord, Agent
      (and such other persons as are in privity of estate with Landlord as may
      be set out in a notice from time to time) are named as additional
      insureds, and under which the insurer agrees to indemnify and hold
      Landlord, Agent and those in privity of estate with Landlord, harmless
      from and against all cost, expense and/or liability arising out of or
      based upon any and all claims, accidents, injuries and damages set forth
      in Section 10.1.  Each such policy shall be non-cancelable and non-
      amendable with respect to Landlord, Agent and Landlord's said designees
      without thirty (30) days' prior notice, shall be written on an
      "occurrence" basis, and shall be in at least the amounts of the Initial
      Public Liability Insurance specified in Section 1.3 or such greater
      amounts as Landlord shall from time to time request, and a duplicate
      original thereof shall be delivered to Landlord.


                                      22
<PAGE>
 
10.3  TENANT'S RISK.  Tenant agrees to use and occupy the Premises and to use
      -------------                                                          
      such other portions of the Property as Tenant is herein given the right to
      use at Tenant's own risk. Except to the extent that such claims arise from
      the negligent acts or omissions of Landlord or its agents or employees,
      neither Landlord nor Landlord's insurers shall have any responsibility or
      liability for any loss of or damage to Tenant's Removable Property. Tenant
      shall carry "all-risk" property insurance on a "replacement cost" basis,
      insuring Tenant's Removable Property and any alterations, additions or
      improvements installed by Tenant pursuant to Section 5.2, to the extent
      that the same have not become the property of Landlord, and other so-
      called improvements and betterments. The provisions of this Section 10.3
      shall be applicable from and after the execution of this Lease and until
      the end of the Term of this Lease, and during such further period as
      Tenant may use or be in occupancy of any part of the Premises or of the
      Building.

10.4  INJURY CAUSED BY THIRD PARTIES. To the maximum extent that this agreement
      ------------------------------                                           
      may be effective under applicable law, Tenant agrees that Landlord shall
      not be responsible or liable to Tenant, or to those claiming by, through
      or under Tenant, for any loss or damage that may be occasioned by or
      through the acts or omissions of persons occupying adjoining premises or
      any part of the Property adjacent to or connecting with the Premises or
      any part of the Property or otherwise.


                                  ARTICLE 11
                                  ----------

                         LANDLORD'S ACCESS TO PREMISES
                         -----------------------------


11.1  LANDLORD'S RIGHTS. Landlord and Agent shall have the right, subject to
      -----------------                                                     
      Tenant's reasonable security restrictions set forth in Exhibit TS, to
                                                             ----------    
      enter the Premises at all reasonable hours and upon reasonable advance
      notice (which need not be in writing, and which need not be given at all
      in the event of an emergency) for the purpose of inspecting or making
      repairs to the same, and Landlord and Agent shall also have the right,
      subject to such restrictions, to make access available at all reasonable
      hours to prospective or existing mortgagees, purchasers or tenants of any
      part of the TPR Properties.

                                      23
<PAGE>
 
                                  ARTICLE 12
                                  ----------

                          FIRE, EMINENT DOMAIN, ETC.
                          --------------------------


12.1  ABATEMENT OF RENT.  If (a) the Premises shall be damaged by fire or
      -----------------                                                  
      casualty, or (b) the Property is damaged by fire or casualty such that the
      Tenant's use of the Premises for the conduct of Tenant's business is
      materially and adversely affected, Basic Rent and Escalation Charges
      payable by Tenant shall abate proportionately for the period in which, by
      reason of such damage, there is substantial interference with Tenant's use
      of the Premises, having regard for the extent to which Tenant may be
      required to discontinue Tenant's use of all or a portion of the Premises,
      but such abatement or reduction shall end if and when Landlord shall have
      substantially restored the Premises (excluding any alterations, additions
      or improvements made by Tenant pursuant to Section 5.2) to the condition
      in which they were prior to such damage.  If the Premises shall be
      affected by any exercise of the power of eminent domain, Basic Rent and
      Escalation Charges payable by Tenant shall be justly and equitably abated
      and reduced according to the nature and extent of the loss of use thereof
      suffered by Tenant.  In no event shall Landlord have any liability for
      damages to Tenant for inconvenience, annoyance, or interruption of
      business arising from such fire, casualty or eminent domain.

12.2  RIGHTS OF TERMINATION. (a) If the Premises or the Building are
      ---------------------                                         
      substantially damaged by fire or casualty (the term "substantially
      damaged" meaning damage of such a character that the same cannot, in
      ordinary course, reasonably be expected to be repaired within one hundred
      thirty-five (135) days from the time that repair work would commence), or
      if any part of the Building is taken by any exercise of the right of
      eminent domain, then Landlord shall have the right to terminate this Lease
      (even if Landlord's entire interest in the Premises may have been
      divested) by giving notice of Landlord's election so to do within sixty
      (60) days after the occurrence of such casualty or the effective date of
      such taking, whereupon this Lease shall terminate 30 days after the date
      of such notice with the same force and effect as if such date were the
      date originally established as the expiration date hereof.

      b) If Landlord does not elect to terminate this Lease pursuant to
      paragraph (a), then Landlord shall obtain from Landlord's architect or
      engineer, and deliver to Tenant within forty-five (45) days after the
      occurrence of such casualty or the effective date of such taking, as the
      case may be, a written and stamped determination and certification as to
      such architect's or engineer's opinion as to the time that would
      reasonably be required to substantially complete the necessary repair and
      restoration of such damage. If such certification reflects that such
      damage cannot reasonably be expected to be substantially repaired within
      six (6) months from date of commencement of such work, Tenant shall have
      the right to terminate this Lease by giving notice to Landlord thereof
      within fifteen (15) days after the receipt of such certification (or, if
      such certification is not delivered by Landlord, then within 15 days after
      the expiration of such 45-day period). This Lease shall cease and come to
      an end without further liability or obligation on the part of either party
      thirty (30) days after such giving of notice by Tenant.


                                      24
<PAGE>
 
12.3  RESTORATION. If this Lease shall not have been terminated pursuant to
      -----------                                                          
      Section 12.2, Landlord shall thereafter use due diligence to restore the
      Premises (excluding any alterations, additions or improvements made by
      Tenant pursuant to Section 5.2, except those that have been sufficiently
      incorporated into the Premises as to become a part thereof and be covered
      by Landlord's property damage insurance) to proper condition for Tenant's
      use and occupation, provided that Landlord's obligation shall be limited
      to the amount of insurance proceeds available therefor.  If, for any
      reason, such restoration shall not be substantially completed within six
      months after the expiration of the 45-day period referred to in Section
      12.2 (which six-month period may be extended for such periods of time as
      Landlord is prevented from proceeding with or completing such restoration
      for any cause beyond Landlord's reasonable control, but in no event for
      more than an additional three months), Tenant shall have the right to
      terminate this Lease by giving notice to Landlord thereof within thirty
      (30) days after the expiration of such period (as so extended) provided
      that such restoration is not completed within such period.  This Lease
      shall cease and come to an end without further liability or obligation on
      the part of either party thirty (30) days after such giving of notice by
      Tenant unless, within such 30-day period, Landlord substantially completes
      such restoration.  Such right of termination shall be Tenant's sole and
      exclusive remedy at law or in equity for Landlord's failure so to complete
      such restoration, and time shall be of the essence with respect thereto.

12.4  AWARD.  Landlord shall have and hereby reserves and excepts, and Tenant
      -----                                                                  
      hereby grants and assigns to Landlord, all rights to recover for damages
      to the Property and the leasehold interest hereby created, and to
      compensation accrued or hereafter to accrue by reason of such taking,
      damage or destruction, and by way of confirming the foregoing, Tenant
      hereby grants and assigns, and covenants with Landlord to grant and assign
      to Landlord, all rights to such damages or compensation, and covenants to
      deliver such further assignments and assurances thereof as Landlord may
      from time to time request, and Tenant hereby irrevocably appoints Landlord
      its attorney-in-fact to execute and deliver in Tenant's name all such
      assignments and assurances.  Nothing contained herein shall be construed
      to prevent Tenant from prosecuting in any condemnation proceedings a claim
      for the value of any of Tenant's Removable Property installed in the
      Premises by Tenant at Tenant's expense and for relocation expenses,
      provided that such action shall not affect the amount of compensation
      otherwise recoverable by Landlord from the taking authority.

12.5  LANDLORD'S INSURANCE.  Landlord agrees to maintain in full force and
      --------------------                                                
      effect, during the Term of this Lease, property damage insurance with such
      deductibles and in such amounts as may from time to time be carried by
      reasonably prudent owners of similar buildings in the area in which the
      Property is located, provided that in no event shall Landlord be required
      to carry other than fire and extended coverage insurance or insurance in
      amounts greater than the actual insurable cash value of the Building
      (excluding footings and foundations). Landlord may satisfy such insurance
      requirements by including the Property in a so-called "blanket" insurance
      policy, provided that the amount of coverage allocated to the Property
      shall fulfill the foregoing requirements.


                                  ARTICLE 13
                                  ----------

                                    DEFAULT
                                    -------


13.1  TENANT'S DEFAULT.  (a) If at any time subsequent to the date of this Lease
      ----------------                                                          
      any one or more of the following events (herein referred to as a "Default
      of Tenant") shall happen:


                                      25
<PAGE>
 
          (i) Tenant shall fail to pay the Basic Rent, Escalation Charges or
          additional charges hereunder when due and such failure shall continue
          for five (5) full Business Days after notice to Tenant from Landlord;
          or

          (ii) Tenant shall neglect or fail to perform or observe any other
          covenant herein contained on Tenant's part to be performed or observed
          and Tenant shall fail to remedy the same within thirty (30) days after
          notice to Tenant specifying such neglect or failure, or if such
          failure is of such a nature that Tenant cannot reasonably remedy the
          same within such thirty (30) day period, Tenant shall fail to commence
          promptly to remedy the same and to prosecute such remedy to completion
          with diligence and continuity; or

          (iii) Tenant's leasehold interest in the Premises shall be taken on
          execution or by other process of law directed against Tenant; or

          (iv) Tenant shall make an assignment for the benefit of creditors or
          shall be adjudicated insolvent, or shall file any petition or answer
          seeking any reorganization, arrangement, composition, readjustment,
          liquidation, dissolution or similar relief for itself under any
          present or future Federal, State or other statute, law or regulation
          for the relief of debtors (other than the Bankruptcy Code, as
          hereinafter defined), or shall seek or consent to or acquiesce in the
          appointment of any trustee, receiver or liquidator of Tenant or of all
          or any substantial part of its properties, or shall admit in writing
          its inability to pay its debts generally as they become due; or

          (v) An Event of Bankruptcy (as hereinafter defined) shall occur with
          respect to Tenant; or

          (vi) A petition shall be filed against Tenant under any law (other
          than the Bankruptcy Code) seeking any reorganization, arrangement,
          composition, readjustment, liquidation, dissolution, or similar relief
          under any present or future Federal, State or other statute, law or
          regulation and shall remain undismissed or unstayed for an aggregate
          of sixty (60) days (whether or not consecutive), or if any trustee,
          conservator, receiver or liquidator of Tenant or of all or any
          substantial part of its properties shall be appointed without the
          consent or acquiescence of Tenant and such appointment shall remain
          unvacated or unstayed for an aggregate of sixty (60) days (whether or
          not consecutive); or


                                      26
<PAGE>
 
          (vii) If: (x) Tenant shall fail to pay the Basic Rent, Escalation
          Charges, additional charges or other charges hereunder when due or
          shall fail to perform or observe any other covenant herein contained
          on Tenant's part to be performed or observed and Tenant shall cure any
          such failure within the applicable grace period set forth in clauses
          (i) or (ii) above; or (y) a Default of Tenant of the kind set forth in
          clauses (i) or (ii) above shall occur and Landlord shall, in its sole
          discretion, permit Tenant to cure such Default after the applicable
          grace period has expired; and a similar failure or Default shall occur
                                    ---                                         
          more than two (2) times within the next 365 days (whether or not such
          similar failure is cured within the applicable grace period);

      then in any such case Landlord may terminate this Lease by notice to
      Tenant, specifying a date not less than five (5) days after the giving of
      such notice on which this Lease shall terminate and this Lease shall come
      to an end on the date specified therein as fully and completely as if such
      date were the date herein originally fixed for the expiration of the Term
      of this Lease, and Tenant will then quit and surrender the Premises to
      Landlord, but Tenant shall remain liable as hereinafter provided.

      (b) For purposes of clause (a)(v) above, an "Event of Bankruptcy" means
      the filing of a voluntary petition by Tenant, or the entry of an order for
      relief against Tenant, under Chapter 7, 11, or 13 of the Bankruptcy Code,
      and the term "Bankruptcy Code" means 11 U.S.C `101, et seq.. If an Event
                                                          -------             
      of Bankruptcy occurs, then the trustee of Tenant's bankruptcy estate or
      Tenant as debtor-in-possession may (subject to final approval of the
      court) assume this Lease, and may subsequently assign it, only if it does
      the following within 60 days after the date of the filing of the voluntary
      petition, the entry of the order for relief (or such additional time as a
      court of competent jurisdiction may grant, for cause, upon a motion made
      within the original 60-day period):

           (i) file a motion to assume the Lease with the appropriate court;

          (ii) satisfy all of the following conditions, which Landlord and
               Tenant acknowledge to be commercially reasonable:

               (A)  cure all Defaults of Tenant under this Lease or provide
                    Landlord with Adequate Assurance (as defined below) that it
                    will (x) cure all monetary Defaults of Tenant hereunder
                    within 10 days from the date of the assumption; and (y) cure
                    all nonmonetary Defaults of Tenant hereunder within 30 days
                    from the date of the assumption;

               (B)  compensate Landlord and any other person or entity, or
                    provide Landlord with Adequate Assurance that within 10 days
                    after the date of the assumption, it will compensate
                    Landlord and such other person or entity, for any pecuniary
                    loss that Landlord and such other person or entity incurred
                    as a result of any Default of Tenant, the trustee, or the
                    debtor-in-possession;

               (C)  provide Landlord with Adequate Assurance of Future
                    Performance (as defined below) of all of Tenant's
                    obligations under this Lease; and

               (D)  deliver to Landlord a written statement that the conditions
                    herein have been satisfied.


                                      27
<PAGE>
 
      (c)  For purposes only of the foregoing paragraph (b), and in addition to
      any other requirements under the Bankruptcy Code, any future federal
      bankruptcy law and applicable case law, "Adequate Assurance" means at
      least meeting the following conditions, which Landlord and Tenant
      acknowledge to be commercially reasonable:

          (i)  entering an order segregating sufficient cash to pay Landlord and
               any other person or entity under paragraph (b) above, and

         (ii)  granting to Landlord a valid first lien and security interest (in
               form acceptable to Landlord) in all property comprising the
               Tenant's "property of the estate," as that term is defined in
               Section 541 of the Bankruptcy Code, which lien and security
               interest secures the trustee's or debtor-in-possession's
               obligation to cure the monetary and nonmonetary defaults under
               the Lease within the periods set forth in paragraph (b) above;

      (d)  For purposes only of paragraph (b), and in addition to any other
      requirements under the Bankruptcy Code, any future federal bankruptcy law
      and applicable case law, "Adequate Assurance of Future Performance" means
      at least meeting the following conditions, which Landlord and Tenant
      acknowledge to be commercially reasonable:

          (i)  the trustee or debtor-in-possession depositing with Landlord, as
               security for the timely payment of rent and other monetary
               obligations, an amount which, together with any security deposit
               then being held by Landlord, will equal two (2) months' Basic
               Rent and two (2) months' installments on account of Operating
               Expenses and Taxes, computed in accordance with Articles 8 and 9;

         (ii)  the trustee or the debtor-in-possession agreeing to pay in
               advance, on each day that the Basic Rent is payable, the monthly
               installments on account of Operating Expenses and Taxes, computed
               in accordance with Articles 8 and 9 hereof;

        (iii)  the trustee or debtor-in-possession providing adequate assurance
               of the source of the rent and other consideration due under this
               Lease;

         (iv)  Tenant's bankruptcy estate and the trustee or debtor-in-
               possession providing Adequate Assurance that the bankruptcy
               estate (and any successor after the conclusion of the Tenant's
               bankruptcy proceedings) will continue to have sufficient
               unencumbered assets after the payment of all secured obligations
               and administrative expenses to assure Landlord that the
               bankruptcy estate (and any successor after the conclusion of the
               Tenant's bankruptcy proceedings) will have sufficient funds to
               fulfill Tenant's obligations hereunder; and


                                      28
<PAGE>
 
      (e) If the trustee or the debtor-in-possession assumes the Lease under
      paragraph (b) above and applicable bankruptcy law, it may assign its
      interest in this Lease only if the proposed assignee first provides
      Landlord with Adequate Assurance of Future Performance of all of Tenant's
      obligations under the Lease, and if Landlord determines, in the exercise
      of its reasonable business judgment, that the assignment of this Lease
      will not breach any other lease, or any mortgage, financing agreement, or
      other agreement relating to the Property by which Landlord or the Property
      is then bound (and Landlord shall not be required to obtain consents or
      waivers from any third party required under any lease, mortgage, financing
      agreement, or other such agreement by which Landlord is then bound).

      (f) For purposes only of paragraph (e) above, and in addition to any other
      requirements under the Bankruptcy Code, any future federal bankruptcy law
      and applicable case law, "Adequate Assurance of Future Performance" means
      at least the satisfaction of the following condition, which Landlord and
      Tenant acknowledge to be commercially reasonable: the proposed assignee
      submitting a current financial statement, audited by a certified public
      accountant, that allows a net worth and working capital in amounts
      determined in the reasonable business judgment of Landlord to be
      sufficient to assure the future performance by the assignee of Tenant's
      obligation under this Lease;

      (g) If this Lease shall have been terminated as provided in this Article,
      or if any execution or attachment shall be issued against Tenant or any of
      Tenant's property whereupon the Premises shall be taken or occupied by
      someone other than Tenant, then Landlord may re-enter the Premises, either
      by summary proceedings, ejectment or otherwise, and remove and dispossess
      Tenant and all other persons and any and all property from the same, as if
      this Lease had not been made.

      (h) In the event of any termination, Tenant shall pay the Basic Rent,
      Escalation Charges and other sums payable hereunder up to the time of such
      termination, and thereafter Tenant, until the end of what would have been
      the Term of this Lease in the absence of such termination, and whether or
      not the Premises shall have been relet, shall be liable to Landlord for,
      and shall pay to Landlord, as liquidated current damages:  (x) the Basic
      Rent, Escalation Charges and other sums that would be payable hereunder if
      such termination had not occurred, less the net proceeds, if any, of any
      reletting of the Premises, after deducting all expenses reasonably
      incurred in connection with such reletting, including, without limitation,
      all repossession costs, brokerage commissions, legal expenses, attorneys'
      fees, advertising, expenses of employees, alteration costs and expenses of
      preparation for such reletting; and (y) if, in accordance with Section
      3.1(a), Tenant commenced payment of the full amount of Basic Rent on any
      day other than the Commencement Date, the amount of Basic Rent that would
      have been payable during the period beginning on the Commencement Date and
      ending on the day Tenant commenced payment of the full amount of Basic
      Rent under such Section 3.1(a). Tenant shall pay the portion of such
      current damages referred to in clause (x) above to Landlord monthly on the
      days which the Basic Rent would have been payable hereunder if this Lease
      had not been terminated, and Tenant shall pay the portion of such current
      damages referred to in clause (y) above to Landlord upon such termination.


                                      29
<PAGE>
 
      (i) At any time after such termination, whether or not Landlord shall have
      collected any such current damages, as liquidated final damages and in
      lieu of all such current damages beyond the date of such demand, at
      Landlord's election Tenant shall pay to Landlord an amount equal to the
      excess, if any, of the Basic Rent, Escalation Charges and other sums as
      hereinbefore provided which would be payable hereunder from the date of
      such demand assuming that, for the purposes of this paragraph, annual
      payments by Tenant on account of Taxes and Operating Expenses would be the
      same as the payments required for the immediately preceding Operating or
      Tax Year for what would be the then unexpired Term of this Lease if the
      same remained in effect, and discounted to then present value using an
      interest factor equal to the then "prime rate" as set by the Wall Street
      Journal (or other authoritative source designated by Landlord), over the
      then fair net rental value of the Premises for the same period, also
      discounted to then present value at the same rate.

      (j) In case of any Default by Tenant, re-entry, expiration and
      dispossession by summary proceedings or otherwise, Landlord may (i) re-let
      the Premises or any part or parts thereof, either in the name of Landlord
      or otherwise, 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 of this Lease and may grant
      concessions or free rent to the extent that Landlord considers advisable
      and necessary to re-let the same and (ii) may make such reasonable
      alterations, repairs and decorations in the Premises as Landlord in its
      sole judgment considers advisable and necessary for the purpose of
      reletting the Premises; and the making of such alterations, repairs and
      decorations shall not operate or be construed to release Tenant from
      liability hereunder as aforesaid.  Landlord shall in no event be liable in
      any way whatsoever for failure to re-let the Premises, or, in the event
      that the Premises are re-let, for failure to collect the rent under such
      re-letting, provided that Landlord agrees to use commercially reasonable
      efforts to relet the Premises (subject to the foregoing terms and
      qualifications), but Landlord shall not be required to give the Premises
      any preference or priority over other office space that Landlord may then
      have available for lease. Tenant hereby expressly waives any and all
      rights of redemption granted by or under any present or future laws in the
      event of Tenant being evicted or dispossessed, or in the event of Landlord
      obtaining possession of the Premises, by reason of the violation by Tenant
      of any of the covenants and conditions of this Lease.

      (k) If a Guarantor of this Lease is named in Section 1.2, the happening of
      any of the events described in paragraphs (a)(iv)-(a)(vi) of this Section
      13.1 with respect to the Guarantor shall constitute a Default of Tenant
      hereunder.

      (l) The specified remedies to which Landlord may resort hereunder are not
      intended to be exclusive of any remedies or means of redress to which
      Landlord may at any time be entitled lawfully, and Landlord may invoke any
      remedy (including the remedy of specific performance) allowed at law or in
      equity as if specific remedies were not herein provided for.

      (m) All costs and expenses reasonably incurred by or on behalf of Landlord
      (including, without limitation, attorneys' fees and expenses at both the
      trial and appellate levels) in enforcing its rights hereunder or
      occasioned by any Default of Tenant shall be paid by Tenant.


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<PAGE>
 
13.2  LANDLORD'S DEFAULT. Except as may be otherwise expressly provided in this
      ------------------                                                       
      Lease, Landlord shall in no event be in default in the performance of any
      of Landlord's obligations hereunder unless and until Landlord shall have
      failed to perform such obligations within thirty (30) days, or if such
      failure is of such a nature that Landlord cannot reasonably remedy the
      same within such thirty (30) day period, Landlord shall fail to commence
      promptly (and in any event within such thirty (30) day period) to remedy
      the same and to prosecute such remedy to completion with diligence and
      continuity.


                                  ARTICLE 14
                                  ----------

                           MISCELLANEOUS PROVISIONS
                           ------------------------


14.1  EXTRA HAZARDOUS USE. Tenant covenants and agrees that Tenant will not do
      -------------------
      or permit anything to be done in or upon the Premises, or bring in
      anything or keep anything therein, which shall increase the rate of
      property or liability insurance on the Premises or the Property above the
      standard rate applicable to Premises being occupied for Permitted Uses;
      and Tenant further agrees that, in the event that Tenant shall do any of
      the foregoing, Tenant will promptly pay to Landlord, on demand, any such
      increase resulting therefrom, which shall be due and payable as an
      additional charge hereunder.

14.2  WAIVER. (a) Failure on the part of Landlord to complain of any action or
      ------
      non-action on the part of Tenant, no matter how long the same may
      continue, shall never be a waiver by Landlord of any of Landlord's rights
      hereunder. Further, no waiver at any time of any of the provisions hereof
      by Landlord shall be construed as a waiver of any of the other provisions
      hereof, and a waiver at any time of any of the provisions hereof shall not
      be construed as a waiver at any subsequent time of the same provisions.
      The consent or approval of Landlord to or of any action by Tenant
      requiring such consent or approval shall not be construed to waive or
      render unnecessary Landlord's consent or approval to or of any subsequent
      similar act by the other.

      (b) No payment by Tenant, or acceptance by Landlord, of a lesser amount
      than shall be due from Tenant to Landlord shall be treated otherwise than
      as a payment on account of the earliest installment of any payment due
      from Tenant under the provisions hereof.  The acceptance by Landlord of a
      check for a lesser amount with an endorsement or statement thereon, or
      upon any letter accompanying such check, that such lesser amount is
      payment in full, shall be given no effect, and Landlord may accept such
      check without prejudice to any other rights or remedies which Landlord may
      have against Tenant.

14.3  COVENANT OF QUIET ENJOYMENT. Landlord represents to Tenant that, as of
      ---------------------------
      the date hereof, Landlord holds title to the Premises and has the right to
      enter into this Lease (subject to approval by Landlord's lender). Tenant,
      subject to the terms and provisions of this Lease, on payment of the Basic
      Rent and Escalation Charges and observing, keeping and performing all of
      the other terms and provisions of this Lease on Tenant's part to be
      observed, kept and performed, shall lawfully, peaceably and quietly have,
      hold, occupy and enjoy the Premises during the term hereof, without
      hindrance or ejection by any persons lawfully claiming under Landlord to
      have title to the Premises superior to Tenant; the foregoing covenant of
      quiet enjoyment is in lieu of any other covenant, express or implied.


                                      31
<PAGE>
 
14.4  LANDLORD'S LIABILITY. (a) Tenant specifically agrees to look solely to
      --------------------
      Landlord's then equity interest in the Property at the time owned, for
      recovery of any judgment from Landlord; it being specifically agreed that
      Landlord (original or successor) shall never be personally liable for any
      such judgment, or for the payment of any monetary obligation to Tenant.
      The provision contained in the foregoing sentence is not intended to, and
      shall not, limit any right that Tenant might otherwise have to obtain
      injunctive relief against Landlord or Landlord's successors in interest,
      or to take any action not involving the personal liability of Landlord
      (original or successor) to respond in monetary damages from Landlord's
      assets other than Landlord's equity interest in the Property.

      (b) With respect to any services or utilities to be furnished by Landlord
      to Tenant, Landlord shall in no event be liable for failure to furnish the
      same when prevented from doing so by strike, lockout, breakdown, accident,
      order or regulation of or by any governmental authority, or failure of
      supply, or failure whenever and for so long as may be necessary by reason
      of the making of repairs or changes which Landlord is required or is
      permitted by this Lease or by law to make or in good faith deems
      necessary, or inability by the exercise of reasonable diligence to obtain
      supplies, parts or employees necessary to furnish such services, or
      because of war or other emergency, or for any other cause beyond
      Landlord's reasonable control, or for any cause due to any act or neglect
      of Tenant or Tenant's servants, agents, employees, licensees or any person
      claiming by, through or under Tenant, nor shall any such failure give rise
      to any claim in Tenant's favor that Tenant has been evicted, either
      constructively or actually, partially or wholly.

      (c) Notwithstanding the foregoing to the contrary, if, due to any act or
      omission on the part of Landlord in violation of this Lease, Tenant is
      prevented from receiving essential services or utilities that Landlord is
      obligated to perform or deliver under this Lease, and such interruption of
      essential services or utilities renders the Premises untenantable, and if
      such interruption shall continue for a period of five (5) consecutive days
      after notice thereof from Tenant to Landlord that the Premises are
      untenantable as a result thereof, Basic Rent and Escalation Charges shall
      abate commencing on the sixth day after such notice (and, if less than all
      of the Premises are affected by such interruption, such abatement shall be
      pro-rated according to the area so affected) until such time as such
      services or utilities are restored. Except as expressly provided in
      paragraph (d) below, Tenant's rights herein granted shall be Tenant's sole
      remedies for any such interruption. The foregoing rights shall not apply
      to repairs or changes necessitated by fire or other casualty, or by the
      exercise of the right of eminent domain, which shall be governed by
      Article 12, or to interruptions resulting from matters beyond Landlord's
      reasonable control as described in paragraph (b) above.


                                      32
<PAGE>
 
      (d) If, due to any act or omission on the part of Landlord in violation of
      this Lease, Tenant is prevented from receiving essential services or
      utilities that Landlord is obligated to perform or deliver under this
      Lease, and such interruption of essential services or utilities renders
      the Premises untenantable, and if such interruption shall continue for a
      period of twenty (20) consecutive days after notice thereof from Tenant to
      Landlord that the Premises are untenantable as a result thereof, Tenant
      may give Landlord notice that Tenant intends to cure such act or omission
      to the extent necessary to restore the delivery of such essential services
      or utilities. Such notice shall bear, on the exterior envelope, the
      following legend in prominent lettering: "NOTICE OF TENANT'S EXERCISE OF
      SELF-HELP REMEDIES," and shall be delivered to all required addressees by
      hand delivery. If Landlord shall fail to advise Tenant within five (5)
      additional Business Days after delivery of such notice, that Landlord has
      commenced to restore such services or utilities, then Tenant may give
      Landlord a final notice of Tenant's intent to restore such services or
      utilities, with the same legend and delivered as above, and after the
      expiration of two (2) additional Business Days without Landlord's notice
      that it has commenced necessary restoration, Tenant may commence and
      thereafter diligently pursue the same to completion. Tenant shall
      undertake any such work using qualified contractors and suppliers, and in
      complete accordance with all applicable laws, codes and ordinances. Once
      Tenant commences such restoration, Tenant shall not discontinue or abandon
      the same without Landlord's consent. Landlord shall reimburse Tenant for
      the actual and reasonable cost to Tenant of completing such restoration,
      within thirty (30) days after receipt from Tenant of invoices evidencing
      the same, provided that Tenant shall in no event be entitled to withhold
      such amounts from, or otherwise set off such amounts against, payments of
      Basic Rent, Escalation Charges or other amounts due from Tenant to
      Landlord hereunder.

      (e) In no event shall Landlord ever be liable to Tenant for any loss of
      business or any other indirect or consequential damages suffered by Tenant
      from whatever cause.

      (e) Where provision is made in this Lease for Landlord's consent and
      Tenant shall request such consent and Landlord shall fail or refuse to
      give such consent, Tenant shall not be entitled to any damages for any
      withholding by Landlord of its consent, it being intended that Tenant's
      sole remedy shall be an action for specific performance or injunction, and
      that such remedy shall be available only in those cases where Landlord has
      expressly agreed in writing not to unreasonably withhold its consent.
      Furthermore, whenever Tenant requests Landlord's consent or approval
      (whether or not provided for herein), Tenant shall pay to Landlord, on
      demand, as an additional charge, any expenses incurred by Landlord
      (including without limitation legal fees and costs, if any) in connection
      therewith.

      (f) With respect to any repairs or restoration which are required or
      permitted to be made by Landlord, the same may be made during normal
      business hours and Landlord shall have no liability for damages to Tenant
      for inconvenience, annoyance or interruption of business arising
      therefrom. Landlord agrees, however, to use commercially reasonable
      efforts to minimize any unreasonable interference with Tenant's business
      operations in the Premises.

14.5  NOTICE TO MORTGAGEE OR GROUND LESSOR. After receiving notice from any
      ------------------------------------
      person, firm or other entity that it holds a mortgage or a ground lease
      which includes the Premises, no notice from Tenant to Landlord alleging
      any default by Landlord shall be effective unless and until a copy of the
      same is given to such holder or ground lessor (provided Tenant shall have
      been furnished with the name and address of such holder or ground lessor),
      and the curing of any of Landlord's defaults by such holder or ground
      lessor shall be treated as performance by Landlord.


                                      33
<PAGE>
 
14.6  ASSIGNMENT OF RENTS AND TRANSFER OF TITLE. (a) With reference to any
      -----------------------------------------
      assignment by Landlord of Landlord's interest in this Lease, or the rents
      payable hereunder, conditional in nature or otherwise, which assignment is
      made to the holder of a mortgage on property which includes the Premises,
      Tenant agrees that the execution thereof by Landlord, and the acceptance
      thereof by the holder of such mortgage shall never be treated as an
      assumption by such holder of any of the obligations of Landlord hereunder
      unless such holder shall, by notice sent to Tenant, specifically otherwise
      elect and that, except as aforesaid, such holder shall be treated as
      having assumed Landlord's obligations hereunder only upon foreclosure of
      such holder's mortgage and the taking of possession of the Premises.

      (b) In no event shall the acquisition of Landlord's interest in the
      Property by a purchaser which, simultaneously therewith, leases Landlord's
      entire interest in the Property back to the seller thereof be treated as
      an assumption by operation of law or otherwise, of Landlord's obligations
      hereunder, but Tenant shall look solely to such seller-lessee, and its
      successors from time to time in title, for performance of Landlord's
      obligations hereunder.  In any such event, this Lease shall be subject and
      subordinate to the lease to such purchaser-lessor, provided that Landlord
      shall obtain the agreement of such purchaser-lessor that, subject to such
      reasonable qualifications as such purchaser-lessor may impose, in the
      event of the termination of such lease, so long as no Default of Tenant
      exists hereunder, Tenant's right to possession of the Premises shall not
      be disturbed and Tenant's other rights hereunder shall not be adversely
      affected. For all purposes, such seller-lessee, and its successors in
      title, shall be the Landlord hereunder unless and until Landlord's
      position shall have been assumed by such purchaser-lessor.

      (c) Except as provided in paragraph (b) of this Section, in the event of
      any transfer of title to the Property by Landlord, Landlord shall
      thereafter be entirely freed and relieved from the performance and
      observance of all covenants and obligations hereunder.

14.7  RULES AND REGULATIONS. Tenant shall abide by rules and regulations from
      ---------------------
      time to time established by Landlord, it being agreed that such rules and
      regulations will be established and applied by Landlord in a non-
      discriminatory fashion, such that all rules and regulations shall be
      generally applicable to other tenants, if any, of similar nature to the
      Tenant named herein, of the Building. Landlord agrees to use reasonable
      efforts to insure that any such rules and regulations are uniformly
      enforced, but Landlord shall not be liable to Tenant for violation of the
      same by any other tenant or occupant of the Building, or persons having
      business with them. In the event that there shall be a conflict between
      such rules and regulations and the provisions of this Lease, the
      provisions of this Lease shall control. Rules and Regulations currently in
      effect are set forth in Exhibit RR.
                              ---------- 

14.8  ADDITIONAL CHARGES. If Tenant shall fail to pay when due any sums under
      ------------------
      this Lease designated as an Escalation Charge or additional charge,
      Landlord shall have the same rights and remedies as Landlord has hereunder
      for failure to pay Basic Rent.

14.9  INVALIDITY OF PARTICULAR PROVISIONS. If any term or provision of this
      -----------------------------------
      Lease, or the application thereof to any person or circumstance shall, to
      any extent, be invalid or unenforceable, the remainder of this Lease, or
      the application of such term or provision to persons or circumstances
      other than those as to which it is held invalid or unenforceable, shall
      not be affected thereby, and each term and provision of this Lease shall
      be valid and be enforced to the fullest extent permitted by law.


                                      34
<PAGE>
 
14.10 PROVISIONS BINDING, ETC. Except as herein otherwise provided, the terms
      -----------------------
      hereo