<PAGE>   1
                                                                   Exhibit 10.32


                                  LEASE BETWEEN


                       BEDFORD WOODS LIMITED PARTNERSHIP I


                                       AND

                               RSA SECURITY, INC.

                                       FOR

   111,780 SQUARE FEET AT BEDFORD WOODS, BUILDING 4 - 176 MIDDLESEX TURNPIKE,

                                    BEDFORD,
                                  MASSACHUSETTS


                                      INDEX
                                      -----
<TABLE>
<S>                                                                                              <C>
REFERENCE DATA
--------------

Section 1.1                         Subject Referred To                                          1
Section 1.2                         Exhibits                                                     4

ARTICLE II - PREMISES AND TERM:
------------------------------

Section 2.1                         Premises                                                     5
</TABLE>


<PAGE>   2


<TABLE>
<S>                                                                                              <C>
Section 2.2                         Term                                                          5

ARTICLE III - CONSTRUCTION:
--------------------------

Section 3.1                         Initial Construction                                          6
Section 3.1.1                       Tenant's Work                                                10
Section 3.1.2                       Tenant's Construction Work                                   11
Section 3.2                         Preparation of Premises for Occupancy                        12
Section 3.2.1                       Partial Occupancy and Rent Commencement                      14
Section 3.3                         General Provisions Applicable to Construction                15
Section 3.4                         Representatives                                              15
Section 3.5                         Force Majeure                                                16
Section 3.6                         Arbitration by Architects                                    16
Section 3.7                         Warranty of Landlord's Work and Tenant's Work                17
Section 3.8                         Tenant's Contribution to Landlord's Work                     17

ARTICLE IV - RENT:
-----------------

Section 4.1                         Rent                                                         18
Section 4.2                         Operating Cost Reimbursement                                 18
Section 4.2.1                       Landlord's Operating Costs                                   18
Section 4.2.2                       Real Estate Taxes                                            22
Section 4.2.3                       Utilities                                                    23
Section 4.3                         Payments                                                     24

ARTICLE V - LANDLORD'S COVENANTS:
--------------------------------

Section 5.1                         Landlord's Covenants During the Term                         25
Section 5.1.1                       Building Services                                            25
Section 5.1.2                       Additional Building Services                                 25
Section 5.1.3                       Repairs                                                      25
Section 5.1.4                       Quiet Enjoyment                                              26
Section 5.1.5                       Intentionally Deleted                                        26
Section 5.1.6                       Landlord's Insurance                                         26
Section 5.1.7                       Landlord's Indemnity                                         26
Section 5.1.8                       Hazardous Materials                                          27
Section 5.1.9                       Tenant's Costs                                               27
Section 5.1.10                      Park Common Areas                                            27
Section 5.2                         Interruptions                                                28

ARTICLE VI - TENANT'S COVENANTS:
-------------------------------

Section 6.1                         Tenant's Covenants During the Term                           28
Section 6.1.1                       Tenant's Payments                                            29
Section 6.1.2                       Repairs and Yielding Up                                      29
</TABLE>


                                       ii
<PAGE>   3


<TABLE>
<S>                                                                                              <C>
Section 6.1.3                       Occupancy and Use                                            29
Section 6.1.4                       Rules and Regulations                                        29
Section 6.1.5                       Compliance with Laws and Safety Appliances                   30
Section 6.1.6                       Assignment and Subletting                                    30
Section 6.1.7                       Indemnity                                                    33
Section 6.1.8                       Tenant's Liability Insurance                                 33
Section 6.1.9                       Tenant's Workers' Compensation Insurance                     33
Section 6.1.10                      Landlord's Right of Entry                                    33
Section 6.1.11                      Loading                                                      34
Section 6.1.12                      Landlord's Costs                                             34
Section 6.1.13                      Tenant's Property                                            34
Section 6.1.14                      Labor or Materialmen's Liens                                 35
Section 6.1.15                      Changes or Additions                                         35
Section 6.1.16                      Holdover                                                     36
Section 6.1.17                      Hazardous Materials                                          36
Section 6.1.18                      Signs                                                        37
Section 6.1.19                      Lighting Restrictions                                        39
Section 6.1.20                      Transportation Demand Management Plan                        39
Section 6.1.21                      Telecommunications and Rooftop Installations                 39
Section 6.1.22                      Tenant's Authority                                           41
Section 6.1.23                      Confidentiality                                              41

ARTICLE VII - CASUALTY AND TAKING:
---------------------------------

Section 7.1                         Casualty and Taking                                          41
Section 7.2                         Reservation of Award                                         45
Section 7.3                         Additional Casualty Provisions                               45

ARTICLE VIII - RIGHTS OF MORTGAGEE:
----------------------------------

Section 8.1                         Priority of Lease                                            46
Section 8.2                         Limitation on Mortgagee's Liability                          46
Section 8.3                         Mortgagee's Election                                         46
Section 8.4                         No Prepayment or Modification, etc.                          47
Section 8.5                         No Release or Termination                                    47
Section 8.6                         Continuing Offer                                             47
Section 8.7                         Submittal of Financial Statement                             48

ARTICLE IX - DEFAULT:
--------------------

Section 9.1                         Events of Default by Tenant                                  48
Section 9.2                         Tenant's Obligations After Termination                       49

ARTICLE X - MISCELLANEOUS:
-------------------------
</TABLE>


                                      iii
<PAGE>   4


<TABLE>
<S>                                                                                              <C>
Section 10.1                        Titles                                                       50
Section 10.2                        Notice of Lease                                              50
Section 10.3                        Notices from One Party to the Other                          50
Section 10.4                        Bind and Inure                                               50
Section 10.5                        No Surrender                                                 51
Section 10.6                        No Waiver, etc.                                              51
Section 10.7                        No Accord and Satisfaction                                   51
Section 10.8                        Cumulative Remedies                                          51
Section 10.9                        Partial Invalidity                                           52
Section 10.10(a)                    Landlord's Right to Cure                                     52
Section 10.10(b)                    Tenant's Right to Cure                                       52
Section 10.11                       Estoppel Certificate                                         52
Section 10.12                       Waiver of Subrogation                                        53
Section 10.13                       Brokerage                                                    53
Section 10.14                       Access and Security System                                   53
Section 10.15                       Entire Agreement                                             54
Section 10.16                       Governing Law                                                54
Section 10.17                       Additional Representations                                   54
Section 10.18                       Parking                                                      54
Section 10.19                       Right of First Offer                                         55
Section 10.19.1                     Affiliates                                                   57
</TABLE>


                                       iv
<PAGE>   5


                   Date of Lease Execution: November 17, 2000


                                 REFERENCE DATA
                                 ---------------
1.1  SUBJECTS REFERRED TO:
     ---------------------
     Each reference in this Lease to any of the following subjects shall
     incorporate the data stated for that subject in this Section 1.1.

     LANDLORD:                          Bedford Woods Limited Partnership I, a
                                        Massachusetts limited partnership

     MANAGING AGENT:                    The Gutierrez Company, a Delaware
                                        Corporation

     LANDLORD'S AND MANAGING            Burlington Office Park
     AGENT'S ADDRESS:                   One Wall Street
                                        Burlington, Massachusetts 01803

     LANDLORD'S REPRESENTATIVE:         John A. Cataldo

     LANDLORD'S CONSTRUCTION            Arturo J. Gutierrez or John A. Cataldo
     REPRESENTATIVES:

     TENANT:                            RSA Security, Inc., a Delaware
                                        corporation

     TENANT'S ADDRESS                   Prior to Term Commencement Date:
     (FOR NOTICE & BILLING):
                                        20 Crosby Drive
                                        Bedford, MA 01730

                                        After Term Commencement Date:
                                        Building 4 - Bedford Woods
                                        176 Middlesex Turnpike
                                        Bedford, Massachusetts 01730

     TENANT'S REPRESENTATIVE(S):        John F. Kennedy

     TENANT'S CONSTRUCTION
     REPRESENTATIVE(S):                 Richard White


<PAGE>   6


     BUILDING:                          Four (4) story building consisting of
                                        188,220 rentable square feet constructed
                                        upon the land described on Exhibit A
                                        attached hereto (the "Lot") in
                                        accordance with the final Landlord's
                                        Plans and Tenant's Plans (as defined in
                                        Article III hereof, and any replacements
                                        thereof) and any alterations and
                                        additions thereto, including the
                                        Tenant's Work (as hereinafter defined).

     RENTABLE FLOOR AREA OF             111,780 rentable square feet
     TENANT'S SPACE:

     TOTAL RENTABLE FLOOR AREA          140,012 rentable square feet
     OF THE BUILDING:

     SCHEDULED TENANT'S DESIGN          March 30, 2001, subject to the
     COMPLETION DATE                    provisions of Section 3.1

     SCHEDULED TERM                     March 2, 2002
     COMMENCEMENT DATE:

     OUTSIDE DELIVERY DATE:             Per Section 3.2

     TERM EXPIRATION DATE:              Fifteen (15) years following the Term
                                        Commencement Date determined in
                                        accordance with Section 3.2 subject to
                                        extension in accordance with Exhibit F.

     TERM:                              Fifteen (15) years, subject to extension
                                        in accordance with Exhibit F.

     FIXED RENT:                        Years 1-3: $1,970,681.00/Year;
                                        ($17.63/RSF); $164,223.42/month
                                        Years 4-6:  $2,194,241.00/Year;
                                        ($19.63/RSF); $182,853.42/month
                                        Year 7-10: $2,529,581.00/Year;
                                        ($22.63/RSF); $210,798.42/month
                                        Years 11-15: $2,976,701.00/Year;
                                        ($26.63/RSF); $248,058.42/Month


                                       2
<PAGE>   7


     INITIAL ANNUAL ESTIMATED
     OPERATING COSTS: (Not Including
     Real Estate Taxes)                 $175,015.00/Year; $14,584.58 Month;
                                        ($1.25/RSF)

     INITIAL ANNUAL ESTIMATED REAL
     ESTATE TAXES                       $273,023.00/Year; $22,751.92/Month;
                                        ($1.95/SF)

     SECURITY DEPOSIT:                  Not Applicable

     GUARANTOR:                         Not Applicable

     PERMITTED USES:                    Research, development, general office,
                                        including training and administrative
                                        purposes, light manufacturing, assembly
                                        and such other uses that are ancillary
                                        and accessory thereto.

     REAL ESTATE BROKERS:               Grubb & Ellis Company
                                        Meredith & Grew, Inc.

     PUBLIC LIABILITY INSURANCE:
     BODILY INJURY AND PROPERTY DAMAGE:

                                        Each Occurrence: $1,000,000.00
                                        Aggregate: $2,000,000.00
                                        Umbrella: $3,000,000.00

     SPECIAL PROVISIONS:                Option to Extend:     Per Exhibit F
                                        Premises Expansion:   Per Exhibit O
                                        Market Rent:          Per Exhibit P

                                        Right of First Offer: Per Section 10.19


                                       3
<PAGE>   8


1.2  EXHIBITS

     The Exhibits listed below in this Section are incorporated in this Lease by
     reference and are to be construed as part of this Lease:

<TABLE>
<S>                      <C>
     EXHIBIT A           Plans Showing Tenant's Space, the Lot and the Park (including the
                         Building Parking Area and Common Areas)
     EXHIBIT A-1         Legal Description of the Lot
     EXHIBIT B-1         Preliminary Base Building Plans
     EXHIBIT B-2         Base Building Outline Specifications
     EXHIBIT C-1         Form of Certificate of Substantial Completion
     EXHIBIT C-2         Form of Certificate of Final Completion
     EXHIBIT D           Intentionally Deleted
     EXHIBIT E           Rules and Regulations
     EXHIBIT F           Option to Extend
     EXHIBIT G           Tenant Estoppel Certificate
     EXHIBIT H           Tenant's Contractors and Subcontractors Minimum Insurance
                         Requirements
     EXHIBIT I           Park Covenants
     EXHIBIT J           Subordination, Non-Disturbance and Attornment Agreement
     EXHIBIT K           Form of Work Change Order
     EXHIBIT L           Definition of Cost of the Work
     EXHIBIT M           Intentionally Deleted
     EXHIBIT N           Intentionally Deleted
     EXHIBIT O           Premises Expansion
     EXHIBIT P           Definition of Market Rent
     EXHIBIT Q           Intentionally Deleted
     EXHIBIT R           Intentionally Deleted
     EXHIBIT S           Schedule
     EXHIBIT T           Form of Notice of Lease
</TABLE>


                                       4
<PAGE>   9


                                   ARTICLE II
                                PREMISES AND TERM

2.1  PREMISES

     Subject to and with the benefit of the provisions of this Lease, Landlord
hereby leases to Tenant and Tenant leases from Landlord, the Rentable Floor Area
of Tenant's Space in the Building (hereinafter, the "Tenant's Space"), together
with the appurtenances described below. Tenant's Space as the same may be
expanded pursuant to Exhibit R, with such appurtenances, is hereinafter
collectively referred to as "the Premises".

     Tenant shall have, as appurtenant to the Premises, the right to use in
common with other tenants of the Park, as hereinafter defined, the areas shown
on the Plan attached hereto as part of Exhibit A as "Building Parking Area", all
subject to and as further provided in Section 10.18 hereof.

     Tenant shall also have, as appurtenant to the Premises, the right to use in
common with others entitled thereto, subject to reasonable rules of general
applicability to tenants and owners of other lots in the park, commonly known
and referred to as the Bedford Woods Office Park and shown on the Plan of the
Park attached hereto as part of Exhibit A (the "Park") from time to time made by
Landlord in accordance with Section 6.1.4 of which Tenant is given written
notice: (a) the common areas now or hereafter located at the Park (the "Common
Areas"), including, without limitation, the Common Areas shown on the Plan of
the Park attached hereto as Exhibit A, as such Common Areas may be amended or
modified by Landlord from time to time during the Term hereof provided however
that (i) any amendments or modifications to such Common Area will not materially
adversely effect Tenant's ability to access the Premises (ii) Landlord will
provide Tenant prior written notice thereof and (iii) provided further that any
such amendments or modifications to the Common Areas are reasonably functionally
equivalent to the portion of the Common Areas that they amend or replace, (b)
all rights of ingress and egress to and from the Building and to and from the
Park, all service areas, drainage structures and areas for surface water runoff,
including, without limitation, storm drainage systems, ground water recharge
areas and detention areas, (c) all driveways, roadways, sidewalks and footways
and lighting systems, (d) all parking areas designated as common or visitors
parking areas for use of the entire Park, if any, (e) all other rights
appurtenant to the Lot and the Building, and (f) all utility lines, electricity,
water and sewage disposal pipes and structures.

2.2  TERM

     To have and to hold for a period (the "Term") commencing on the Term
Commencement Date determined in accordance with Section 3.2 (which said date is
at times being hereafter referred to as the "Commencement Date") and continuing
until the Term Expiration Date, unless sooner terminated as provided in Sections
3.2, 7.1 or in Article IX, or unless extended pursuant to Exhibit F.


                                       5
<PAGE>   10


                                   ARTICLE III
                                  CONSTRUCTION

3.1  INITIAL CONSTRUCTION

     Landlord shall fully construct the base Building in accordance with the
preliminary base building plans, including, without limitation, floor plans,
elevations and site plan(s) (collectively, the "PBBP") and Base Building Outline
Specifications attached hereto as Exhibits B-1 and B-2, respectively (all of
such work being collectively referred to as the "Landlord's Work"). In the event
of differences between the PBBP or the Landlord's Plans (as hereinafter defined)
and the Base Building Outline Specifications, the Base Building Outline
Specifications shall govern and control until the Landlord's Plans (as
hereinafter defined) are prepared.

     A complete set of final base Building plans and construction drawings and
specifications, such drawings and specifications to include a detailed schedule
of core base Building finish items such as, but not limited to, carpets, doors,
hardware, ceiling grids/tiles, lavatory fixtures, light fixtures, window blinds,
lobby allowance and paint (collectively, the "Landlord's Plans") shall be
prepared by Landlord, at its sole cost and expense. Landlord and Tenant agree to
work together with Landlord's architect, Symmes Maini & McKee Associates, Inc.
in order to achieve a design that meets the standard set forth below.
Furthermore, Landlord has delivered, except for interior details, Landlord's
Plans to Tenant entitled "The Gutierrez Company, Building 4, Bedford Woods,
Bedford, MA, Tenant Review A1.1, A1.2, A1.3, A1.4, A2.1, A3.1" dated November
13, 2000 and Landlord's Site Plans entitled "the Gutierrez Company, Building 4,
Bedford Woods, Bedford, MA, Revised Notice of Intent dated February 4, 1999
Revised thorough November 8, 2000 and November 10, 2000 C1.1, C2.1, C2.2, C3.1,
C3.2, C4.1, C4.2, C5.1, C5.2, C6.1, C6.2, C6.3 and C6.4, prepared by Symmes,
Maini & McKee Associates and Tenant has approved same. Landlord agrees to use
good faith and diligent efforts to deliver the interior details of Landlord's
Plans to Tenant on or before January 15, 2001. Upon receipt, Tenant shall have
five (5) business days to comment upon the interior details of Landlord's Plans.
Landlord and Tenant shall use reasonable efforts to reach agreement on the
interior details of Landlord's Plans by January 26, 2001. In reaching agreement,
Landlord and Tenant shall each approve portions of the Landlord's Plans that are
in acceptable form and shall note their respective objections to the portions
that are unacceptable to each of them so as to enable Landlord to start
construction and order materials in a timely manner. In the event that
Landlord's Plans conform with the PBBP, but Tenant does not approve the interior
details of Landlord's Plans within five (5) business days of receipt thereof
from Landlord, then the Outside Delivery Date (as hereinafter defined) shall be
extended for a number of days equal to the number of Tenant Plan Delay Days, as
such term is hereinafter defined. The number of Tenant Plan Delay Days are
defined as and shall be calculated by determining the actual number of days as
certified by Landlord and its architect that the Term Commencement Date was
delayed by such Tenant's failure to approve the Landlord's Plans within the
required five (5) business days. Landlord agrees to provide Tenant with written
notice of such determination, such notice to include reasonable detail
describing the cause of the delay and the number of Tenant Plan Delay Days as
certified by Landlord and its architect. In addition to such notice of such
determination, Landlord shall promptly provide Tenant a courtesy


                                       6
<PAGE>   11


notice upon Tenant's failure to comply with the dates set forth in this
paragraph. If Tenant and Tenant's Architect (as hereinafter defined) disagree
with the existence or calculation of Tenant Plan Delay Days as determined by
Landlord and its architect, then Tenant shall, within five (5) business days of
receipt of Landlord's notice, notify Landlord of its disagreement, whereupon the
dispute shall be determined pursuant to the arbitration procedures described in
Section 3.6 hereof.

     Landlord and Tenant hereby acknowledge and agree that, except as otherwise
set forth herein, following approval by Landlord and Tenant (which shall be in
writing as hereinafter provided), no amendments, modifications or changes shall
be made to the Landlord's Plans without Tenant's prior written approval in each
instance, which such approval shall not be unreasonably withheld or delayed;
provided, however, no such prior approval of Tenant shall be required if the
proposed amendments, modifications or changes are, in Landlord's reasonable
opinion (i) non-material in nature, (ii) replaced by substantially equivalent or
better items and at all times equal to or better than that of the building
located at (the so-called "GenRad Office Building")Westford Technology Park,
Westford, Massachusetts, and (iii) do not adversely affect the Premises. Without
limiting the foregoing, Landlord shall exercise reasonable efforts to provide
Tenant with prior written notice of all proposed amendments, modifications or
changes to the Landlord's Plans.

     Landlord shall, at Tenant's sole cost and expense, cause its architects and
engineers to design enclosed, heated and cooled bridges between the Building and
the proposed Buildings 2 and 4, and provide Tenant with a budget cost estimate
for such bridges and the required Base Building modifications to accommodate
such bridges. Landlord will, at Tenant's sole cost and expense, modify its Base
Building steel, precast, glazing and foundation design to accommodate such
bridges. Unless otherwise directed by Tenant, such materials as specified in the
modified design will be ordered to accommodate the proposed bridges. Any
additional costs associated with such materials, modifications and upgrades to
the Base Building as previously designed and specified will be paid by Tenant to
Landlord whether or not Tenant elects to have Landlord construct the bridges. In
order to expedite the permitting of the Building, Landlord may elect to apply
for any permits required for the construction of the bridges after receiving the
building permit for the Building. Therefore, completion of the bridge shall NOT
be required of Landlord as a condition of Substantial Completion of Landlord's
Work or Tenant's Work or Punch List Work. Notwithstanding the foregoing, once
construction of the bridge to Building 4 is authorized by Tenant in writing then
Landlord shall proceed with diligence to design and order the bridge materials,
apply for permits for construction of the bridge and construct and complete same
with due diligence and speed. The failure of the Tenant to pay Landlord the
costs and expenses incurred as set forth in this paragraph within ten (10) days
of the billing thereof by Landlord shall be an event of default under this
Lease.

     A complete set of construction plans and specifications for Tenant's Work
(as hereinafter defined) shall be prepared by Tenant's Architect, as hereinafter
defined (collectively, the "Tenant's Plans"). The Tenant's Plans shall be
furnished to Landlord as herein provided. Landlord and Tenant hereby acknowledge
and agree that Tenant has selected Margulies & Associates to be Tenant's
Architect for preparation of Tenant's Plans, and the costs of services of


                                       7
<PAGE>   12


such Tenant's Architect shall be borne solely by Tenant. Tenant's Architect (and
Tenant's Representatives) shall be actively involved in the design decisions and
shall be allowed reasonable access to the Lot and the Premises during
construction to monitor Landlord's compliance with the terms and provisions of
this Lease. Landlord and Tenant hereby further agree that Tenant shall be solely
responsible for coordinating with Tenant's Architect for the timely preparation
of Tenant's Plans in accordance with the terms and provisions of this Section
3.1. Attached as Exhibit S is a schedule (the "Schedule") setting forth the
respective dates by which Landlord and Tenant anticipate that (i) Landlord's
Plans shall have been delivered to and approved by Tenant, (ii) Tenant's Plans
shall have been delivered to and approved by Landlord, and (iii) certain
portions of Landlord's Work and Tenant's Work shall be substantially completed.
The parties agree to cooperate with each other and to exercise reasonable
efforts to complete the tasks described in the Schedule by the respective dates
set forth therein, Landlord and Tenant hereby further agreeing that, unless
otherwise expressly set forth herein, failure to meet any of such dates on the
Schedule shall not constitute a default or a delay of any type hereunder.

     Tenant shall deliver the Tenant's Plans to the Landlord by not later than
the Scheduled Tenant's Design Completion Date, provided, however, that (i)
Tenant furnishes to Landlord by not later than December 10, 2000 any information
in the Tenant Plans that affect the Lobby Plans in the Landlord Plans; and (ii)
Tenant furnishes to Landlord by not later than January 8, 2001 any such
information to be contained in the Tenant's Plans that affects Landlord's Work
which shall include but not be limited to the roof and slab penetrations of the
Building. Tenant shall permit Landlord to review and provide input during the
preparation of Tenant's Plans. Upon receipt, Landlord shall have ten (10)
business days to comment upon the Tenant's Plans. Landlord and Tenant shall use
reasonable efforts to reach agreement on the Tenant's Plans within ten (10) days
of Tenant's receipt of Landlord's comments thereto. In reaching such agreement,
Landlord and Tenant shall each approve portions of Tenant's Plans that are
acceptable and shall note their respective objections to the portions that are
unacceptable to each of them so as to enable Landlord to continue construction
and order materials in a timely manner. In connection with Landlord's review of
the Tenant's Plans, or if Tenant fails to deliver Tenant's Plans (or any
modifications thereto) by the date set forth above, Landlord may require by
prompt written notice to Tenant (i) modifications in Tenant's Plans (i.e. if
Tenant's Plans are not compatible with Landlord's Plans), and/or (ii) an
adjustment in the Outside Delivery Date (such adjustment to be determined by
Landlord in its reasonable judgment). Landlord's notice to Tenant shall include
reasonable detail describing the cause of the adjustment and/or the extent of
the incompatibility with reasonable specificity. Any such extension in time,
whether mutually agreed to by Landlord and Tenant or determined by their
respective architects in the event of dispute pursuant to Section 3.6, shall
result in Tenant's Plan Delay Days as hereinbefore determined. In addition,
Landlord will not approve Tenant's Plans which involve any construction,
alterations or additions requiring unusual expense to readapt the Premises to
normal office use on the Term Expiration Date, unless Tenant first gives
assurances acceptable to Landlord that such readaptation shall be made prior to
such termination without expense to Landlord. All revisions and modifications to
the Tenant's Plans shall be made promptly by Tenant and revised sets of Tenant's
Plans shall be forthwith furnished to Landlord upon Tenant's receipt thereof,
Landlord hereby agreeing to inform Tenant in writing during the plan approval
process and, in any event,


                                       8
<PAGE>   13


prior to the installation thereof, of any such items that may require unusual
expense to readapt the Premises as aforesaid and any items that must be removed
by Tenant at the end of the Term or earlier termination of this Lease. All
revisions and modifications to the Tenant's Plans shall be made promptly by
Tenant and revised sets of Tenant's Plans shall be forthwith furnished to
Landlord upon Tenant's receipt thereof. Landlord and Tenant hereby further agree
to acknowledge in writing when final approval by Landlord and Tenant of Tenant's
Plans (and Landlord's Plans) has occurred.

     Landlord shall have fifteen (15) business days after final approval of
Tenant's Plans and Landlord's receipt of final and complete sets of approved
Tenant's Plans, which such final approval has been acknowledged in writing by
Landlord and Tenant as aforesaid, to price the cost of Tenant's Work (as
hereinafter defined) in accordance with the last Section of Section 3.1.1.

     Landlord and Tenant shall cooperate during the above time periods so that
each party makes the other aware of their progress with respect to the foregoing
plans, selections and pricing, as well as timing, availability or cost
constraints of Tenant's selections or specifications and proposed alternates.

     Landlord shall cause the Premises to be completed in accordance with
Landlord's Plans and Tenant's Plans, all of such work to be performed by
Landlord's general contractor, Gutierrez Construction Co., Inc. After final
approval of Landlord's Plans and Tenant's Plans by Landlord and Tenant, the
Tenant may request changes to Landlord's Work or Tenant's Work (as applicable)
by altering, adding to, or deducting from Landlord's Work or Tenant's Work (as
applicable) as set forth in the agreed form of Landlord's Plans or Tenant's
Plans, as applicable (each such requested change is referred to herein as a
"Change Order"). A Change Order requested by Tenant in Landlord's Work (or in
Tenant's Work as such term is defined in Section 3.1.1 hereof) which affects
Landlord's Work, or Tenant's Work, may also necessitate an adjustment in the
Outside Delivery Date (as defined in Section 3.2 hereof) and may result in
Tenant Alteration Delay Days (as hereinafter defined), in accordance with and
subject to the terms and conditions set forth below. Landlord shall notify
Tenant promptly in writing if such requested Change Order shall result in Tenant
Alteration Delay Days, and therefore an adjustment in the Outside Delivery Date.
In addition, Landlord agrees to provide Tenant, upon Tenant's request, with
sufficient itemization and back-up documentation to facilitate analysis and to
confirm the cost of any such changes in the Landlord's Work or the Tenant's Work
initiated by Tenant. Tenant shall pay to Landlord an amount equal to the actual
cost (as defined in Section 3.1.1 hereof) of Landlord's Work, including the
costs of any such changes initiated by Tenant, less any appropriate credits for
any Landlord's Work deleted, (hereinafter, the "Net Additional Cost of
Landlord's Work"). The Net Additional Cost of Landlord's Work shall be due and
payable to Landlord in the manner provided for in Section 3.1.1 hereof.

     In the event that Tenant requests a Change Order which would, due to
materials or equipment having long delivery times or due to resulting sequencing
delays, and notwithstanding Landlord's diligent efforts, result in a delay in
the Term Commencement Date, then Tenant shall be deemed to have agreed that it
will pay Fixed Rent (as hereinafter provided in Section 4.1) and


                                       7
<PAGE>   14


additional rent hereunder for a number of days equal to the actual number of
days (the "Tenant Alteration Delay Days") as certified by Landlord and its
architect, by which the Term Commencement Date would be delayed by such
alterations or additions, giving due consideration to Landlord's obligation to
use diligent efforts to accelerate construction to make up for lost time due to
delays. Landlord agrees to promptly provide Tenant with written notice of such
determination, such notice to include reasonable detail describing the cause of
the delay and the number of Tenant Alteration Delay Days as certified by
Landlord and its architect. Should Tenant and Tenant's Architect disagree with
the calculation of Tenant Alteration Delay Days as hereinabove determined, then
such disagreement shall be resolved pursuant to the provisions of Section 3.6
hereof.

     All Tenant improvements, changes and additions shall be part of the
Premises (and shall remain therein at the end of the Term), except for Tenant's
business fixtures, equipment and personal property (which such personal property
shall include, without limitation, demountable partitions, equipment and
telephone or computer systems), all of which fixtures, equipment and personal
property shall remain the property of the Tenant and shall be removed at the
expiration of the Term; and such other items installed during the initial
construction of the Building or Tenant's Work shall be removed or left as the
Landlord and Tenant agree in writing at the time of Landlord's approval of the
plans and specifications therefor. Landlord acknowledges and agrees that any
wiring placed within the conduits, plenums and interior of the walls of the
Premises shall remain in the Premises following the termination of this Lease.
Landlord agreeing however that any supplemental HVAC units that are in addition
to and not in substitution for upgrades of any HVAC units in the Landlord's
Plans and any emergency generators and UPS systems in addition to and not in
substitution for or upgrades of any emergency generator or UPS system in
Landlord's Plans may be removed by Tenant at the expiration of the Term provided
the Tenant restores the Building to its prior condition, and repairs any damage
to the Building caused by such removal. In addition Tenant may request certain
additional items contained in Tenant Plans to be removable by Tenant upon the
expiration of the Term, which if agreed to by the Landlord, may be removed by
Tenant in accordance with the provisions of this paragraph. Should Landlord fail
to so agree in writing then at Tenant's option the parties shall use the
arbitration procedure set forth in Section 3.6 of this Lease to determine if
removal of such items would normally be allowed as a standard practice in
Suburban Boston office leases. Tenant agrees to repair and restore, at its sole
cost and expense, any damage to the Premises caused by any such removal by
Tenant in accordance with this Section.

3.1.1 TENANT'S WORK.

     So long as Landlord has approved Tenant's Plans in writing, as hereinabove
referenced, Landlord and Tenant agree that Landlord's general contractor will
construct the tenant improvements set forth on the Tenant's Plans (hereinafter
"Tenant's Work") with respect to the Premises at cost (as hereinafter defined),
plus a Landlord's contractor's fee of five and one half percent (5 1/2%) of such
aggregate cost as hereinafter provided. In order to provide for payment by
Tenant of the cost of Tenant's Work, the Net Additional Cost of Landlord's Work,
and any additional costs due to Change Orders provided for hereunder, Tenant
expressly covenants with Landlord that Tenant agrees to pay Landlord, or its
contractor, as the case may be, within ten (10)


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<PAGE>   15


business days of receipt of each of Landlord's monthly Tenant's Work
requisitions therefor, the amount of such requisition for the Tenant's Work, the
Net Additional Cost of Landlord's Work, and/or any Change Orders, performed in
the Premises for the preceding month based on a percentage of completion basis.
Such requisitions shall not include the five (5%) percent retainage of all
payments to be made to subcontractors until such subcontractors have fully
completed their work. At Tenant's request, each requisition shall include copies
of all subcontractor's and supplier's applications for payment and satisfactory
evidence of payment of all previous invoices submitted by subcontractors and
suppliers. In addition, Landlord's architect shall certify that the subject work
specified in each of such monthly requisitions has been substantially completed,
and a copy of such certification shall accompany each requisition furnished to
Tenant hereunder. In the event Tenant's Architect disagrees with the Landlord's
architect's certification as set forth in the immediately preceding sentence,
then such disagreement shall be resolved pursuant to the provisions of Section
3.6 hereof except that the time for each architect to establish the amount in
dispute shall be six (6) calendar days. In no event shall any of such costs due
and payable hereunder remain unpaid by Tenant for more than fifteen (15) days
after receipt of such Landlord's requisition, or as of the Term Commencement
Date.

     For purposes hereof, Landlord and Tenant further agree that the
certification of cost by Gutierrez Construction Co., Inc. shall be based on the
definition of cost as more particularly set forth in Exhibit L hereto. Any
changes to the Tenant's Plans after the approval of the Tenant's Plans (and any
changes to Landlord's Plans after the approval thereof as set forth in Section
3.1 above) shall be in accordance with the form of Change Order attached hereto
as Exhibit K.

     In addition, in the event that Landlord and Tenant are unable to agree on
the cost of any portion of Tenant's Work hereunder, any disagreement shall be
resolved pursuant to the provisions of Section 3.6 hereof.

     Upon commencement of the Tenant's Work, Landlord and Tenant hereby further
agree, each acting reasonably and in good faith, to attend and participate in
weekly construction meetings with Landlord's general contractor's construction
manager(s) during such construction process.

3.1.2 TENANT'S CONSTRUCTION WORK.

     Tenant agrees that any construction included in Tenant's Plans which Tenant
specifies to be done by itself or its contractors (hereinafter referred to as
"Tenant's Construction Work"), which shall include, for example, Tenant's
installation of furnishings, computers, lab equipment, IT/MIS, security and
later changes or additions, shall be completed by and coordinated with any work
being performed by Landlord in such manner as to maintain harmonious labor
relations and not materially damage the Premises, Lot or Park or materially
interfere with the operation of the Building or with any of Landlord's
construction work hereunder, including but not limited to the construction of
the Landlord's Work and Tenant's Work. Tenant shall ensure that its contractors
or subcontractors procure and maintain insurance as required by Tenant's
Contractor's and Subcontractor Minimum Insurance Requirements set forth in
Exhibit "H" to this Lease. Tenant


                                       11
<PAGE>   16


(including its contractors, agents or employees) shall have access to the
Premises and may perform Tenant's Construction Work prior to the Scheduled Term
Commencement Date and prior to the commencement of the Term so as to prepare the
Premises for occupancy by Tenant, provided that (i) Tenant's contractors, agents
or employees work in a harmonious labor relationship with Landlord's general
contractor, (ii) reasonable prior written notice is given to Landlord's general
contractor specifying the work to be done, and (iii) no work, as reasonably
determined by Landlord, shall be done or fixtures or equipment installed by
Tenant in such manner as to materially interfere with the completion of
Landlord's Work and the Tenant's Work being done by or for Landlord on the
Premises. During the period of preoccupancy of the Premises by Tenant in
connection with Tenant's Construction Work prior to the commencement of the
Term, no Fixed Rent or additional rent or other charges shall accrue or be
payable, but otherwise such preoccupancy shall be subject to all the terms,
covenants and conditions contained in this Lease.

3.2  PREPARATION OF PREMISES FOR OCCUPANCY.

     Landlord shall perform the construction work set forth in the Landlord's
Plans and the Tenant's Plans, and, therefore, Landlord agrees to use diligent
efforts to have the Premises ready for occupancy on the Scheduled Term
Commencement Date.

     Landlord and Tenant agree that time is of the essence, and Landlord agrees
to use diligent efforts to accelerate construction to make up for time lost due
to any delay. Unless sooner terminated by Tenant pursuant to the provisions of
Section 3.2, the Term of this Lease shall commence on the date the Premises are
deemed ready for occupancy as set forth below (the "Term Commencement Date").

     The Premises shall be deemed "ready for occupancy" on the earlier of:

     (a)  the date on which Tenant occupies all or any portion of the Premises
for the Permitted Uses; or

     (b)  (1) the date on which the construction of all of the Landlord's Work
and the Tenant's Work is Substantially Completed, as defined below, and (2)
Landlord has delivered to Tenant copies of all permits and approvals (the
"Permits") required to be obtained from any governmental agency in connection
with the (i) construction of the Building or (ii) prior to occupancy of the
Premises by Tenant, including, without limitation, a permanent certificate of
occupancy from the Town of Bedford or a temporary certificate of occupancy from
the Town of Bedford which allows Tenant to use and occupy the Premises,
including in all cases use of the elevator(s), and which temporary certificate
of occupancy is not conditional on the performance of any work other than the
Punch List Work as defined below, except that such Permits shall not be required
as a condition of Substantial Completion if Landlord is unable to secure the
same due solely to Tenant's failure to complete Tenant's Construction Work as
specified in Section 3.1.2 above (which such date, subject to additional terms
and provisions of this Section 3.2, shall hereinafter be referred to as the date
of "Substantial Completion" or which such work shall hereinafter be referred to
as "Substantially Completed"). In any event, notwithstanding the


                                       12
<PAGE>   17


achievement of Substantial Completion, all Punch List Work shall be completed by
no later than sixty (60) days following Substantial Completion, except as
hereinafter provided.

     An AIA Certificate of Substantial Completion by the Landlord's architect
(which such Certificate shall be in the form attached hereto as Exhibit C-1)
shall evidence the Landlord's determination that it has performed all such
obligations, except for completing the landscaping work and completing the final
paving course, and minor items stated in such Certificate to be incomplete or
not in conformity with such requirements, or will not materially interfere with
Tenant's use or occupancy of the Premises and all of which work shall be
identified and specified in the Certificate of Substantial Completion
(collectively such landscaping work, finish paving course work and minor items
are referred to herein as the "Punch List Work") shall be promptly completed.
Tenant shall have the right within fifteen (15) days after Tenant's receipt of
said Certificate of Substantial Completion to notify Landlord of its
disagreement with said Certificate and to identify additional items of Punch
List Work, all of which shall be completed by Landlord no later than July 30,
2002.

     If weather materially and adversely interferes with Landlord's ability to
finish the final course of paving and outside work or such other Punch List
Work, which such work does not materially interfere with Tenant's occupancy, and
the operation of Tenant's business therein, said work can be completed by
Landlord reasonably thereafter, so long as such delay does not and will not
interfere with or prevent Tenant from obtaining a certificate of occupancy upon
completion of all other work herein described.

     After Landlord has completed all Landlord's Work and Tenant's Work,
including all Punch List Work, Landlord's architect shall forward to Tenant its
Certificate of Final Completion, such Certificate to be in the form attached
hereto as Exhibit C-2. In addition, promptly after completion of all such work,
including all Tenant's Construction Work by Tenant, Landlord shall forward to
Tenant a final certificate of occupancy from the Town of Bedford.

     The phrase "Tenant's Delay" shall mean the aggregate number of days
(excluding any days of delay caused by or resulting from Force Majeure) equal to
the actual number of days that, notwithstanding its diligent and good faith
efforts to complete construction by the Scheduled Term Commencement Date, the
Landlord is delayed in completing its construction by the Scheduled Term
Commencement Date due to (i) the failure of the Tenant to deliver the Tenant's
Plans (or portions or modifications thereto) to Landlord on the dates
established pursuant to Section 3.1 hereof, or (ii) a delay caused by Tenant
performing the Tenant's Construction Work pursuant to Section 3.1.2 hereof, or
(iii) a delay or stoppage requested in writing by Tenant, or (iv) the number of
Tenant Alteration Delay Days resulting from Change Orders requested by Tenant
pursuant to Section 3.1 hereof, or (v) the number of Tenant Plan Delay Day(s)
pursuant to Section 3.1 hereof, then the Term Commencement Date shall be deemed
to have occurred on the date, as certified by Landlord and its architect, that
Substantial Completion would have occurred had there not occurred such Tenant's
Delay, calculated by determining the number of days of Tenant's Delay as
aforesaid, giving consideration to Landlord's obligation under the second
Section of this Section 3.2 to accelerate to make up for time lost due to any
delays. Landlord agrees to promptly provide Tenant with written notice of such
Tenant's Delay promptly after the


                                       13
<PAGE>   18


occurrence of such Tenant's Delay, such notice to include reasonable detail
describing the cause of the delay as certified by Landlord's architect.

     Notwithstanding the foregoing provisions, if the Premises are not deemed
ready for occupancy on or before the Outside Delivery Date (as defined below)
for whatever reason, Tenant may elect (i) to cancel this Lease at any time
thereafter while the Premises are not deemed ready for occupancy by giving
notice to Landlord of such cancellation which shall be effective ten (10) days
after such notice, unless within such ten (10) day period Landlord delivers the
Premises ready for occupancy as defined herein, in which event such notice of
cancellation shall be rendered null and void and of no further force or effect,
or (ii) to enforce Landlord's covenants to construct the Premises in accordance
with the terms of this Lease. In the event Tenant elects to enforce Landlord's
agreement to construct the Premises in accordance with this Lease, Tenant shall
also have the right to terminate this Lease if Landlord fails to complete the
Premises within the period of time set by any court of competent jurisdiction
for such work to be completed, or within such additional period of time from the
date of Landlord's default as may be mutually agreed to by Landlord and Tenant.
Notwithstanding any provision of this Lease to the contrary, in the event that
the Premises are not deemed ready for occupancy on or prior to the Scheduled
Term Commencement Date (as such date may be extended for reasons due to Force
Majeure and/or to Tenant's Delay), then Tenant may elect to receive from
Landlord as liquidated damages an abatement of Fixed Rent (following the
commencement of rental obligations pursuant to Section 4.1 hereof) equal to (a)
one hundred percent (100%) of the Fixed Rent for each day the Landlord's Work
and the Tenant's Work is not Substantially Completed forty five (45) days beyond
the Scheduled Term Commencement Date, as such date may be extended as aforesaid,
(b) one hundred twenty-fifty percent (125%) of the Fixed Rent for each day the
Landlord's Work and Tenant's Work is not completed one hundred twenty (120) days
beyond the Scheduled Term Commencement Date (as such date may be extended as
aforesaid). If the Premises are not Substantially Completed and therefore not
deemed ready for occupancy on or before such date which is one hundred sixty
(160) days beyond the Scheduled Term Commencement Date, as such date may be
extended as aforesaid, then Tenant may elect to terminate this Lease or enforce
Landlord's covenants to construct as hereinbefore provided. The foregoing
remedies shall be Tenant's sole and exclusive remedies for not having the
Premises ready for occupancy as required hereunder.

     For purposes hereof, the Outside Delivery Date shall be deemed to refer to
that certain date which is one hundred sixty (160) days following the Scheduled
Term Commencement Date, as such date may be extended for a period equal to that
of (i) any delays due to Force Majeure as defined in Section 3.5 hereof, (ii)
the number of delay days caused by a Tenant's Delay as hereinbefore determined.

3.2.1 PARTIAL OCCUPANCY AND RENT COMMENCEMENT.

     If the entire Premises are not ready for occupancy on the Scheduled Term
Commencement Date, the Tenant may elect, but shall have no obligation to, occupy
any portion or portions of the Premises which are ready for occupancy when, in
Landlord's opinion, it can be done without material interference with remaining
work. In such event, Tenant agrees not to


                                       14
<PAGE>   19


materially interfere with Landlord's construction of the Premises. In the event
Tenant elects to take occupancy of a portion of the Premises, that portion shall
be deemed ready for occupancy as to said portion on the date of occupancy of
such portion and Tenant's obligation to pay Fixed Rent and additional rent shall
commence on said date pro rata based on the square footage occupied compared to
the total square footage in the Premises.

3.3  GENERAL PROVISIONS APPLICABLE TO CONSTRUCTION

     All construction work required or permitted by this Lease, whether by
Landlord or by Tenant (or their respective subcontractors), shall be done in a
good and workmanlike manner and in compliance with all applicable laws and all
lawful ordinances, regulations and orders of governmental authority and insurers
of the Building which laws, ordinances and regulations shall include, but shall
not be limited to the Americans with Disabilities Act of 1990 (ADA), the
Massachusetts State Building Code and the Bedford Massachusetts Zoning By-Laws.
Either party may inspect the work of the other at reasonable times and shall
promptly give notice of observed defects. Notice of said defects shall be in
writing and shall be rectified by Landlord or Tenant, as the case may be, within
thirty (30) days of the original date of notice if capable of being corrected
within such time period, otherwise the correction shall be commenced within such
time period and diligently pursued to completion. Failure to provide notice
hereunder shall not be the basis for any liability or for injury or damage
caused by such defect of or waiver of right to cause any defect to be corrected.

3.4  REPRESENTATIVES

     Landlord hereby acknowledges and agrees that only the following person,
John F. Kennedy or Richard P. White or any successor to either of them holding
the same title or any other person delegated the authority from either of them
in writing (hereinafter "Tenant's Construction Representatives") have the
authority to act on Tenant's behalf and represent Tenant's interest with respect
to all matters requiring Tenant's action in this Article. No consent,
authorization or other action by Tenant with respect to matters set forth in
this Article shall bind Tenant unless in writing and signed by one of the
aforementioned persons. Landlord hereby expressly recognizes and agrees that no
other person claiming to act on behalf of Tenant is authorized to do so. If
Landlord complies with any request or direction presented to it by anyone
claiming to act on behalf of Tenant who does not have the title and position
mentioned above, such compliance shall be at Landlord's sole risk and
responsibility and shall not in any way alter or diminish the obligations and
requirements created and imposed by this Article, and Tenant shall have the
right to enforce compliance with this Article without suffering any waiver or
abrogation of any of its rights hereunder.

     Tenant hereby acknowledges and agrees that only the following persons,
Arturo J. Gutierrez, John A. Cataldo or any successors to either of them holding
the same title or any other person delegated the authority from either of them
in writing (hereinafter "Landlord's Construction Representatives") have the
authority to act on Landlord's behalf and represent Landlord's interests with
respect to all matters requiring Landlord's action in this Article. No consent,
authorization or other action by Landlord with respect to matters set forth in
this Article


                                       15
<PAGE>   20


shall bind Landlord unless in writing and signed by one of the aforementioned
persons. Tenant hereby expressly recognizes and agrees that no other person
claiming to act on behalf of Landlord is authorized to do so. If Tenant complies
with any request or direction presented to it by anyone claiming to act on
behalf of Landlord who does not have the title and position mentioned above,
such compliance shall be at Tenant's sole risk and responsibility and shall not
in any way alter or diminish the obligations and requirements created and
imposed by this Article, and Landlord shall have the right to enforce compliance
with this Article without suffering any waiver or abrogation of any of its
rights hereunder.

3.5  FORCE MAJEURE.

     As used in this Article and elsewhere in the Lease, "Force Majeure" shall
mean a time extension equal to that of any delays when the party required to
perform the respective obligation is prevented from doing so, despite the
exercise of reasonable diligence, and such delay is caused by: (i) Acts of God,
(ii) changes in government regulations, (iii) casualty, (iv) strike or other
such labor difficulties, (v) unusual weather conditions, (vi) unusual scarcity
of or inability to obtain supplies, parts or labor to furnish such services with
no reasonably practical alternatives therefor, or (vii) other acts reasonably
beyond Landlord's control, but in no event shall the term include economic or
financing difficulties. Landlord shall provide Tenant with written notice of the
occurrence of a Force Majeure event promptly after the occurrence thereof, and
shall comply with its respective obligation(s) as soon as the cause for the
delay has (have) been eliminated.

3.6  ARBITRATION BY ARCHITECTS.

     Whenever there is a disagreement between the parties with respect to
construction by Landlord of Landlord's Work or Tenant's Work, such disagreement
shall be definitively determined by the following procedure: Each of Landlord
and Tenant shall appoint one (1) independent architect (which such architect may
be Landlord's Architect and Tenant's Architect referenced in Section 3.1 above),
such two (2) architects will then (within five (5) days of their appointment)
appoint a third independent architect licensed in the Commonwealth of
Massachusetts with not less than fifteen (15) years experience. Each architect
shall establish within ten (10) days of their appointment the matter in dispute.
In case of any dispute with respect to dollar amounts or lengths of time or
dates such as the date of Substantial Completion, the dollar amount or length of
time or date shall be the average of the two closest determinations by the three
(3) architects, with the determination of the architect which was not closest to
another architect's determination excluded from such calculation. In case of any
dispute not involving dollar amounts or lengths of time or dates (i.e. the
approval of plans) the determination by at least two (2) of the three (3)
architects shall be required in order to resolve the matter in dispute. Landlord
and Tenant shall each bear the cost of the architect selected by them
respectively and shall share equally the cost of the third architect. During
such arbitration period, the parties agree to cooperate with one another so as
to proceed with construction and with their respective obligations hereunder in
a timely manner. Each determination under this Section 3.6 shall be binding upon
Landlord and Tenant.


                                       16
<PAGE>   21


3.7  WARRANTY OF LANDLORD'S WORK AND TENANT'S WORK.

     Landlord hereby warrants and guarantees that the Landlord's Work and the
Tenant's Work shall be free from defects in workmanship and materials for a
period of one (1) year after the Term Commencement Date. Upon the expiration of
said one (1) year period, Landlord shall assign to Tenant any and all warranties
and guarantees with respect to Landlord's Work and Tenant's Work and, to the
extent that any such warranties and guarantees are not assignable, Landlord
agrees to enforce the same for the benefit of Tenant, at Tenant's sole cost and
expense. Tenant shall not be responsible to pay for any such warranties of less
than one (1) year duration or enforcement by Landlord against its own employees
or against Gutierrez Construction Co., Inc. or against any of its other
affiliates (including their respective employees). Landlord agrees to repair, at
its sole cost and expense any latent defects in Landlord's Work or Tenant's Work
promptly after receipt of notice therefrom from Tenant, provided that such
notice from Tenant is received by Landlord within said one (1) year period. In
connection therewith, Tenant shall notify Landlord promptly after it becomes
aware of any such latent defects. Any repairs or replacements or alterations to
Landlord's Work or Tenant's Work after said initial one (1) year period shall be
chargeable to Tenant in accordance with and subject to the provisions of Section
4.2 hereof.

     In addition to the foregoing, Landlord hereby warrants that Landlord's Work
upon Substantial Completion will comply with all applicable laws then in effect
and as interpreted on the date of Substantial Completion, including but not
limited to all applicable building codes, governmental requirements and the
regulations of the Americans with Disabilities Act of 1990 (ADA) for a period of
one (1) year after the Term Commencement Date. Upon the expiration of said one
(1) year period, Landlord agrees to assign to Tenant any and all warranties and
guarantees with respect to Landlord's Work and any claims that Landlord may have
against any subcontractors for their failure to design or construct the
Landlord's Work in compliance with all applicable laws in effect and as
interpreted on the date of Substantial Completion, including but not limited to
all applicable building codes, governmental requirements and the regulations of
the Americans with Disabilities Act of 1990 (ADA) to the extent such warranties,
guarantees and claims are not assignable, Landlord agrees to use reasonable
efforts, at Tenant's sole cost and expense, to enforce the same for the benefit
of Tenant. Tenant shall not be responsible to pay for any such enforcement
during the one (1) year period following the Term Commencement Date or
enforcement by Landlord against its own employees or against Gutierrez
Construction Co., Inc. or against any of its other affiliates (including their
respective employees).

3.8  TENANT'S CONTRIBUTION TO LANDLORD'S WORK

     Tenant has elected to contribute One Million Six Hundred Seventy-Six
Thousand Seven Hundred Dollars ($1,676,700.00) (i.e., $15.00/s.f.) toward the
cost of Landlord's Work ("Tenant Contribution to Landlord's Work.") In
consideration thereof, Landlord has reduced the Fixed Rent payable in each year
of the Initial Term of this Lease by One Hundred Eighty One Thousand
Eighty-Three Dollars and Sixty Cents ($181,083.60)(i.e., $1.62/s.f.) per year
during each year. Such Fixed Rent as reduced by said amounts is set forth in
Section 1.1 of this Lease. Such Rent Reduction is calculated on the basis of One
Million Six Hundred Seventy Six Thousand Seven


                                       17
<PAGE>   22


Hundred Dollars ($1,676,700.00 times (x) .108. If there was no Tenant
Contribution to Landlord's Work, the Fixed Rent that would otherwise be payable
hereunder during the Initial Term would be as follows: Years 1 through 3: $19.25
per square foot; Years 4 through 6: $21.25 per square foot; Years 7 through 10:
$24.25 per square foot; and Years 11 through 15: $28.25 per square foot. Any
determination of the rent for any Expansion Premises, as the same are defined in
Exhibit "O", or Extensions under the terms of this Lease shall be calculated on
the basis of the unreduced rents set forth in the immediately preceding sentence
rather than the Fixed Rent set forth in Section 1.1 of this Lease which reflects
the reduction thereof in recognition of Tenant Contribution to Landlord's Work
for this Building. Any reduction of Fixed Rent payable for such Expansion
Building(s), or Expansion Premises, or Extension, if any, shall be calculated
after the determination of Fixed Rent for any such Expansion Building(s), or
Expansion Premises, or Extension as provided in the applicable Exhibit to this
Lease.

     Such Tenant Contribution to Landlord's Work will be paid to Landlord within
fifteen (15) days of Substantial Completion of the Building. In order to
guarantee Tenant's obligation to make such Contribution toward the cost of
Landlord's Work, Tenant shall, on or before ten (10) business days following the
execution of this Lease by both parties, provide an irrevocable letter of credit
satisfactory in form and substance to Landlord's proposed construction mortgagee
payable to Landlord and assignable to Landlord's construction mortgagee and its
assigns in the amount of One Million Six Hundred Seventy-Six Thousand Seven
Hundred Dollars ($1,676,700.00). The failure of the Tenant to provide such
letter of credit to the Landlord within said timeframe, or the failure of the
Tenant to pay to Landlord the Tenant Contribution to Landlord's Work, as
specified herein, shall be an event of default under this Lease.

                                   ARTICLE IV
                                      RENT

4.1  RENT

     Tenant agrees to pay, without any offset or reduction, except as expressly
set forth in Section 3.2, 7.1 or 7.2, Fixed Rent equal to 1/12th of the annual
Fixed Rent in the monthly installments set forth in Section 1.1 in equal
installments in advance on the first day of each calendar month included in the
Term; and for any portion of a calendar month occurring at the beginning or end
of the Term, at the rate payable for such portion in advance.

4.2  OPERATING COST REIMBURSEMENT

     Tenant shall pay to Landlord, as additional rent for Landlord's Operating
Costs, an additional payment on the first day of each month occurring during the
Term hereof one-twelfth (1/12) of the amount of estimated annual Landlord's
Operating Costs and estimated annual Real Estate Taxes.

     4.2.1 The Landlord's Operating Costs shall include, without limitation:


                                       18
<PAGE>   23


     (A) The following Building and Lot services which shall be provided by
Landlord: Building and Lot Expenses such as but not limited to (i) the
operation, maintenance and repair of the Building parking lot, Building parking
lot lighting and exterior lighting for the Building and for the Building drives;
(ii) snow removal and sanding of the Building drives and parking lots
specifically not including shoveling and snow removal, sanding and sweeping of
Building or Lot sidewalks which shall be the responsibility of Tenant; (iii)
maintenance and repair of roadways and driveways within the Lot; (iv)
maintenance and repair of exterior sewer, utility and drainage facilities on the
Lot; (v) maintenance and repair of detention areas, ground water recharge areas,
and exterior fire main and exterior fire hydrant facilities on the Lot; (vi)
striping, changing of street and parking lot lamp-post lights on any portion of
the Lot and keeping the same in proper working condition; (vii) fertilization,
mowing and watering of lawns and landscaping, care of shrubbery and general
grounds upkeep on any portion of the Lot (viii) cleaning exterior windows; (ix)
maintaining the caulking, or recaulking of the windows, the precast panels, or
other portions of the Building exterior (specifically excluding Landlord's
structural obligations); (x) obtaining and maintaining real property and rental
interruption special form insurance, including earthquake and flood insurance as
well as commercial general liability insurance on the Building, and "all risk"
insurance, including earthquake and fire coverage on the Building as required by
article 5.1.6 of this Lease. The cost of all such insurance coverage obtained by
the Landlord shall be included in the Landlord's Operating Costs; (xi) after the
initial ten (10) years of Term, the cost of repairing and maintaining and
replacing the roof shall be included in Landlord's Operating Costs; and (xii)
all other reasonable and necessary expenses paid in connection with the
operation, cleaning, maintenance, and repair of the Building and Lot or Park, or
either, and properly chargeable against income, it being agreed that if Landlord
installs a new or replacement capital item for the purpose of reducing
Landlord's Operating Costs (provided Landlord reasonably anticipates such new or
replacement capital item will reduce Landlord's Operating Costs), the costs
thereof as reasonably amortized by Landlord over the useful life in years of the
capital item so installed with legal interest on the unamortized amounts, shall
be included in Landlord's Operating Costs, except as otherwise set forth below
to the contrary. Landlord agrees that all of such services to be included in
Landlord's Operating Costs shall be obtained by Landlord at commercially
reasonable, competitive market rates consistent with the operation and
management of comparable "Class A" office buildings in the suburban Boston area.
Tenant may participate with Landlord in the section of all major service
provider contracts for the Building so as to help control both the cost and
quality of service provided to the Building, so long as Tenant is leasing at
least seventy-five percent (75%) of the Building and is not then in default of
this Lease beyond applicable cure periods, if any, and;

     (B) All Park Services to be provided by the Landlord: Park Expenses, such
as but not limited to, (i) lighting for the Park Common Areas; (ii) snow removal
and sanding and maintenance and repair of roadways and driveways within the Park
Common Areas; (iii) maintenance and repair of common Park exterior sewer,
utility, and drainage facilities; (iv) maintenance and repair of common Park
detention, ground water recharge areas, and exterior fire main and exterior fire
hydrant facilities; (v) striping, changing of street and common drive lamp post
lights, electrical charges for same, and keeping the same in proper working
condition, (vi) lighting, traffic signals, electrical costs of the foregoing,
and traffic control personnel for the park; (vii) fertilization, mowing and
watering of lawns and landscaping, care of shrubbery and


                                       19
<PAGE>   24


general grounds upkeep on common portion of the Park; (viii) operating
Landlord's or the Park's Transportation Demand Management Plan as required by
the Park covenants as set forth in Exhibit "I" hereto, (ix) obtaining and
maintaining commercial general liability insurance covering the Common Areas of
the Park. The Park common areas shall be maintained in a first-class manner,
similar to office/R&D parks in the Billerica/Bedford/Burlington Massachusetts
area.

     Allocation for the Park Common Areas shall be based upon the share of such
costs allocated to the Lot based on the ratio of the square footage of the
Building to the aggregate square footage of all buildings on all lots in the
Bedford Woods Park, and with respect to the costs of snow removal and sanding
and with respect to maintenance of traffic signals and traffic control
personnel, such costs shall be allocated by Landlord on a reasonable basis
taking into consideration the usage of the roadways and the necessity of
additional snow removal and sanding due to overtime and weekend use of certain
buildings within The Bedford Woods Park, and such other pertinent factors as
reasonably determined by Landlord, subject to Tenant's approval, not to be
unreasonably withheld, delayed or conditioned.

     Landlord's Operating Costs as used herein shall mean the sum of one hundred
percent (100%) of the expenses for Landlord's maintenance and repair obligations
related to the Building and its Lot as set forth in Section 4.2.1 A above,
exclusive of utilities which shall be paid by Tenant as provided in this Article
4.2.3, plus a pro rata share for the Park Common Area Expenses as set forth in
Section 4.2.1 B above, which total shall constitute "Landlord's Operating
Costs".

     Notwithstanding anything to the contrary in this Lease contained, Tenant
shall not be required to pay Landlord's Operating Costs for:

     (a)  repairs which are the responsibility of the Landlord, including
          repairs required to be completed by Landlord as set forth in Section
          3.7 of this Lease, structural repairs, as well as repairs or other
          work occasioned by fire or other casualty, not caused by the
          negligence or willful action of Tenant, or by the exercise of eminent
          domain, or any work required for Landlord to comply with its
          construction guarantees;

     (b)  any leasing commissions;

     (c)  any attorney's fees, costs and disbursements and other expenses
          incurred in connection with negotiations or disputes with other
          tenants, occupants or prospective tenants or occupants of the Building
          or Park;

     (d)  interest, principal, ground rent, or other payments under any
          mortgage, ground lease or other financing or refinancing of the
          Building, the Lot or the Park;

     (e)  any advertising or promotional expenditures;


                                       20
<PAGE>   25


     (f)  overhead or profit increment paid to subsidiaries or affiliates of
          Landlord for services on or to the Premises to the extent that the
          costs of such services exceed competitive costs of such services were
          they not so rendered by a subsidiary or affiliate; and

     (g)  real estate taxes for any other lot or building within the Park,
          except to the extent such real estate taxes relate to certain land or
          building(s) which benefit Tenant and are appurtenances to the Building
          (by way of example but not limitation, detention basins serving the
          Lot, driveways, roads, and sidewalks).

     (h)  Costs of corrective defects in the Building or the Building equipment
          or replacing defective equipment solely to the extent such costs
          relate to items covered by warranties of manufacturers, suppliers or
          contractors or are otherwise borne by parties other than Landlord and
          for which Landlord receives full reimbursement provided, however, the
          cost of correcting any defects in the Landlord's Work and Tenant's
          Work in the first year following the Term Commencement Date as set
          forth in Section 3.7 of this Lease shall be excluded from Landlord's
          Operating Costs.

     (i)  Costs of installations paid by or constructed for specific other
          tenants, other than Tenant, or other occupants of the Building or the
          Park.

     (j)  All amounts which are specifically charged to or otherwise paid by any
          other tenant or other occupant of the Building or the Park, or for
          items or services which Landlord provides selectively to one or more
          tenants (other than Tenant) without reimbursement.

     (k)  Any bad debt loss, rent loss or reserves for bad debts or rent loss.

     (l)  Expenses related to third-party landlord-tenant disputes.

     The initial payments for the first calendar year will be based on the
budgets for Landlord's Operating Costs heretofore provided to Tenant, which may
be adjusted as provided in this Section 4.2.

     Tenant shall receive from Landlord within five (5) months of the end of
each calendar year an annual accounting, in writing, of actual charges and shall
have access to the Landlord's records at reasonable times with prior written
notice to verify these charges. If the funds were not fully spent, the Landlord
shall then promptly provide for a rebate to Tenant of all unspent funds within
thirty (30) days of such accountings, and if Landlord's Operating Costs fund was
insufficient to pay such charges, the Tenant shall pay any deficiency to the
Landlord within thirty (30) days of billing by Landlord. Landlord reserves the
right to adjust the estimated Landlord's Operating Costs annually effective on
the first day of each calendar year during the Term hereof upon thirty (30) days
prior written notice to Tenant and upon prior receipt by Tenant of


                                       21
<PAGE>   26


documentation evidencing the reasons for such change. Any such change shall be
effective retroactively to the first day of the calendar year during which the
adjustment is made.

     Notwithstanding anything contained herein, Landlord reserves the right to
separately invoice Tenant during the calendar year for Tenant's share of any
actual expense for items reasonably beyond the Landlord's control contained in
the Landlord's Operating Costs fund which exceeds the amount for such item in
the estimated Landlord's Operating Costs for that year by greater than five
percent (5%) provided: (a) that such special invoicing shall be no more frequent
than twice annually, and (b) that Tenant shall have sixty (60) days to make
payment thereon.

     If the total of the monthly payments paid by Tenant with respect to any
Fiscal Year exceeds the actual Operating Cost Escalation for such Fiscal Year,
then, at Landlord's option, such excess shall be either (i) credited against
payments on account of Operating Cost Escalation next due hereunder, or (ii)
refunded by Landlord to Tenant.

     The term "Fiscal Year" as used in this Article shall mean the period of
twelve (12) consecutive months commencing on January 1 and ending on December
31.

     4.2.2 REAL ESTATE TAXES - Tenant shall pay to Landlord as Additional Rent
the Real Estate Taxes within ten (10) days prior to the due date of any Real
Estate Tax bill. In the event the mortgagee on the Property requires the Real
Estate Taxes to be escrowed, Tenant agrees to pay to Landlord as Additional Rent
with the Fixed Rent payment on the first date of each calendar month included in
the Term, one twelfth (1/12) of the Real Estate Taxes. The Term "Real Estate
Taxes" as used above shall mean all taxes of every kind and nature assessed by
any governmental authority on the Lot, the Building and improvements, or both,
and on the Common Areas of the Park which the Landlord shall become obligated to
pay because of or in connection with the ownership, leasing and operating of the
Lot, the Building and improvements, or both, subject to the following: There
shall be excluded for such taxes all income taxes, excess profits taxes, excise
taxes, franchise taxes, estate, succession, inheritance and transfer taxes,
provided, however, that if at any time during the Term the present system of ad
valorem taxation of real property shall be changed so that in lieu of the whole
or any part of the ad valorem tax on real property, there shall be assessed on
Landlord a capital levy or other tax on the gross rents received with respect to
the Lot, Building and improvements, or both, and the Common Areas of the Park, a
federal, state, county, municipal, or other local income, franchise, excise or
similar tax, assessment, levy or charge (distinct from any now in effect)
measured by or based, in whole or in part, upon any such gross rents, then any
and all of such taxes, assessments, levies or charges, to the extent so measured
or based, shall be deemed to be included within the term "real estate taxes".
Landlord agrees to promptly give Tenant notice of any Real Estate Tax bills
received by Landlord. Tenant shall have the right, upon prior notice to
Landlord, to seek an abatement of or contest or review by legal proceedings or
otherwise any such Taxes, and at the request of Tenant, Landlord shall join and
otherwise cooperate in any such proceedings, provided that Tenant shall defend,
indemnify and save harmless Landlord from and against any cost or expense
incurred by Landlord in connection with any such proceedings. Tenant shall be
entitled


                                       22
<PAGE>   27


to any rebate or refund of Taxes received by Landlord or Tenant to Taxes in
respect of the Premises for the Term of the Lease.

     The amount of any refund of real estate taxes shall be credited against
real estate taxes for the Fiscal Year in which such refund is received;
provided, however, in the event that Landlord receives a refund on account of
real estate taxes after the expiration of the Term, which refund relates to a
Fiscal Year during the Term, the amount of such refund fairly allocable to
Tenant shall be refunded to Tenant by Landlord. All references to real estate
taxes "for" a particular Fiscal Year shall be deemed to refer to real estate
taxes due and payable during such Fiscal Year without regard to when such
impositions are assessed or levied.

     Notwithstanding any language to the contrary contained herein, Landlord's
Operating Costs shall be reduced by reimbursements, credits, discounts,
reductions or other allowances received or receivable by Landlord for items of
cost included in Landlord's Operating Costs (except for reimbursements to
Landlord by tenants under the additional rent provisions of their respective
leases), including any tax refunds realized as a result of any abatement
proceeding or otherwise. Landlord hereby covenants and agrees that, provided
Tenant has paid Real Estate Taxes to Landlord in a timely manner as hereunder
set forth, Landlord will pay such Real Estate Taxes to the taxing authority when
the same are due and payable.

     4.2.3 UTILITIES - Tenant shall pay directly to the proper authorities
charged with the collection thereof all deposits and charges for water, sewer,
gas, electricity, telephone and other utilities or services used or consumed in
the Building, whether called charge, tax, assessment, fee or otherwise,
including, without limitation, water and sewer use charges and taxes, if any,
all such charges to be paid as the same from time to time become due, which
bills shall be placed in Tenant's name and billed directly by the respective
utilities to Tenant, Landlord reserving the right to pay such bills if unpaid by
Tenant beyond any applicable grace period, and to recover such payment from
Tenant with any interest and/or penalties chargeable thereon as Additional Rent.

     All records that the Landlord is required to maintain hereunder shall be
maintained by the Landlord for a period of two (2) years following the
expiration of the Fiscal Year to which such records relate. Tenant shall have
the right, through its representatives, to examine, copy and audit such records
at reasonable times, but no more than once per Fiscal Year, upon not less than
ten (10) days prior written notice. Such records shall be maintained at
Landlord's Address set forth in Section 1.1, or such other place within the
Commonwealth of Massachusetts as Landlord shall designate from time to time for
the keeping of such records. The costs of such audits shall be borne by Tenant;
provided, however, that if such audit establishes that the actual Operating Cost
for the Fiscal Year in question is less than the Landlord's final determination
of the Operating Cost as set forth in the Landlord's Statement submitted to
Tenant by at least six (6%) percent, then Landlord shall pay the reasonable cost
of such audit. If, as a result of such audit, it is determined that Tenant must
pay additional amounts to Landlord on account of the Operating Cost, or that
Tenant has overpaid Landlord on account of the Operating Cost, then the
undercharged or overpaid party shall reimburse the other party for the payment
due, together with


                                       23
<PAGE>   28


interest thereon from the date of Landlord's Statement at the interest rate set
forth in Section 4.3 hereof.

     Notwithstanding anything contained to the contrary in this Lease, the
initial responsibility for the payment of all real estate taxes with respect to
the Building and the Park shall be upon the Landlord and the Landlord agrees to
pay the same as required by law. Landlord shall provide Tenant with a
computation of Tenant's pro rata share thereof, and upon Tenant's request,
copies of all tax bills.

     Landlord shall have the right from time to time to change the periods of
accounting under this Section 4.2 to any annual period other than the Fiscal
Year and upon any such change all items referred to in this Section shall be
appropriately apportioned. In all Landlord's Statements, rendered under this
Section, amounts for periods partially within and partially without the
accounting periods shall be appropriately apportioned, and any items which are
not determinable at the time of a Landlord's Statement shall be included therein
on the basis of Landlord's estimate, and with respect thereto Landlord shall
render promptly after determination a supplemental Landlord's Statement, and
appropriate adjustment shall be made according thereto.

     Notwithstanding any other provision of this Section 4.2, if the Term
expires or is terminated as of a date other than the last day of a Fiscal Year
at the end of the Term, Tenant's last payment to Landlord under this Section 4.2
shall be made on the basis of Landlord's best estimate of the items otherwise
includable in Landlord's Statement and shall be made on or before the later of
(a) ten (10) days after Landlord delivers such estimate to Tenant, or (b) the
last day of the Term, with an appropriate payment or refund to be made upon
submission of Landlord's Statement. Without limitation, the obligation of Tenant
to pay the Operating Cost with respect to any Fiscal Year during the Term (or
portion thereof) shall survive the expiration or earlier termination of the
Term.

4.3  PAYMENTS

     All payments of Fixed Rent and additional rent shall be made to Managing
Agent, or to such other person as Landlord may from time to time designate in
writing. If any installment of rent, Fixed Rent or additional, or on account of
leasehold improvements is paid more than five (5) days after the due date
thereof, at Landlord's election, it shall bear interest at the rate of the prime
rate of Fleet National Bank or a major New York Bank selected by Landlord plus
five (5) percent per annum (or, if lower, the maximum rate permitted by law).


                                       24
<PAGE>   29


                                    ARTICLE V
                              LANDLORD'S COVENANTS

5.1  LANDLORD'S COVENANTS DURING THE TERM

     Landlord covenants during the Term:

     5.1.1 Building Services - To furnish, through Landlord's employees or
           independent contractors, the services set forth in Section 4.2.1
           hereof;

     5.1.2 Additional Building Services - To furnish, through Landlord's
           employees or independent contractors, reasonable additional Building
           operation services upon reasonable advance request of Tenant at
           reasonable and competitive rates from time to time established by
           Landlord to be paid by Tenant;

     5.1.3 Repairs - Except as otherwise provided in Article VII, or except as
           resulting from Tenant's negligence, overloading or misuse, or by
           Tenant's failure to perform its obligations under the Lease, except
           as resulting from settling or sagging within standard engineering
           tolerance (provided that the settling or sagging does not affect the
           surface or structural integrity of the Building or in any way
           materially affect the ordinary and customary use of the Premises, or
           any part thereof by Tenant), or except for damage or deterioration
           resulting from reasonable wear and damage, Landlord shall keep in
           good order, condition and repair, the roof of the Building, all
           gutters and downspouts, foundations, exterior (including exterior
           painting and finish) and structural portions of the Building, all
           building systems serving the Building, and all plumbing and utility
           lines serving the Premises, whether located within or outside of the
           Premises. The Landlord's obligations shall include, without
           limitation, the obligation to make all necessary repairs,
           replacements or alterations to the roof, the exterior walls, the
           foundation, the floor slabs and all other structural elements of the
           Building, as well as caulking windows and precast panels and other
           portions of the Building exterior, to clean the exterior windows of
           the building to maintain the Building Parking Area and to maintain in
           good order and condition the other buildings and improvements located
           within the Park, including but not limited to the Common Areas of the
           Park. Landlord shall also maintain, repair and replace the rooftop
           HVAC equipment (specifically excluding all interior portions of the
           HVAC system including but not limited to VAV boxes, duct work,
           circulating pumps control systems, in the Building) in accordance
           with the requirements of the Landlord's Plans and Tenant's Plans, and
           shall assign (to the extent assignable) all warranties and guarantees
           with respect thereto to Tenant. Tenant may elect, at its cost and
           expense and upon the prior consent of Landlord (which such consent
           shall not be unreasonably withheld or delayed), to bring actions to
           enforce remedies under said warranties or guarantees in the name of
           the Landlord or jointly with Landlord, at no expense to Landlord;


                                       25
<PAGE>   30


     5.1.4 Quiet Enjoyment - That Landlord has the right to make this Lease and
           that Tenant, on paying the rent and performing its obligations
           hereunder, shall peacefully and quietly have, hold and enjoy the
           Premises throughout the Term without any manner of hindrance or
           molestation from Landlord or anyone claiming under Landlord, subject,
           however, to all the terms and provisions hereof;

     5.1.5 Intentionally Deleted.

     5.1.6 Landlord's Insurance - Beginning with the commencement of Landlord's
           Work and thereafter throughout the Term, Landlord shall purchase and
           keep in force, broad-form commercial general liability insurance, or
           the equivalent then-customary form providing comparable coverages,
           written out on an occurrence basis containing provisions adequate to
           protect the Landlord from and against claims for bodily injury,
           including death and personal injury and claims for property damage
           occurring within the Park and/or the Building, such insurance having
           body injury and property damage combined limits of not less than five
           million dollars ($5,000,000) per occurrence. In addition, Landlord,
           for itself and for Tenant as an additional insured as their interest
           may appear, shall procure and continue in force during the Term, as
           the same may be extended hereunder, fire and extended coverage
           insurance, including vandalism, sprinkler leakage and malicious
           mischief, upon the Building on a full replacement cost basis and upon
           the Tenant's Work installed initially by the Landlord in the Building
           on a full replacement cost basis; agreed cost value endorsement with
           agreed values for the Building and other tenant improvements and
           alterations, as determined annually by the Landlord's insurer.
           Landlord shall also procure and continue in force during the Term, as
           the same may be extended hereunder, (i) rental interruption insurance
           for twelve (12) months or the maximum amounts permitted, and (ii)
           Pollution and Remediation Legal Liability insurance. Copies of
           certificates of insurance evidencing the foregoing shall be furnished
           to Tenant, upon Tenant's reasonable request. All insurance required
           of Landlord pursuant to this Section shall be effected under policies
           issued by insurers or recognized responsibility (which are rated A or
           A+ by Best's Rating Service or a comparable rating by an equivalent
           service). The coverages required by this Section 5.1.6 may be
           provided by a single "package policy";

     5.1.7 Landlord's Indemnity - Landlord covenants and agrees to defend, with
           counsel reasonably acceptable to Tenant, save harmless and indemnify
           Tenant from any liability for injury, loss, accident or damage to any
           person or property on the Premises or the Park, and from any claims,
           actions, proceedings and reasonable expenses and costs in connection
           therewith (including, without implied limitation, reasonable counsel
           fees), arising directly from the negligence acts and/or gross
           misconduct of Landlord and not caused directly by the negligent acts
           or gross misconduct of Tenant. In no event shall Landlord be
           obligated to indemnify Tenant for any willful or negligent act or
           omission of Tenant or of any of Tenant's employees, agents,
           contractors or licensees;


                                       26
<PAGE>   31


     5.1.8  Hazardous Materials - Landlord represents and warrants that, to the
            best of Landlord's knowledge as of the date of this Lease (i) there
            does not exist any leak, spill, release, discharge, emissions or
            disposal of Hazardous Materials on the Lot (including the Building
            to be located thereon), and (ii) the Premises do not (and will not
            as of the date of Substantial Completion) contain any Hazardous
            Materials, except as may be specified in Tenant's Plans or as may be
            contained in customary cleaning supplies or in such other supplies
            that are necessary for Landlord to perform its obligations
            hereunder. In the event that any such leak, spill, release,
            discharge, emission or disposal of Hazardous Materials shall occur
            on the Lot or (apart from DE MINIMIS amounts of such materials used
            for cleaning and maintenance purposes or in connection with the
            operation of loading docks) the Building as result of any negligent
            acts or gross misconduct of Landlord, Landlord shall take any and
            all actions necessary to bring the Premises, and/or the Building
            (excluding all portions thereof leased or leasable to tenants) into
            compliance with applicable law and other governmental requirements
            relating thereto.

            Landlord agrees to notify Tenant immediately upon discovery of any
            Hazardous Materials on the Premises and to indemnify, defend and
            hold harmless Tenant and its officers, employees and agents from and
            against any claims, judgments, damages, penalties, fines, costs,
            liabilities or loss which arise (a) before the commencement of the
            Term and (b) during or after the Term from or in connection with the
            presence or suspected presence of Hazardous Materials on the
            Premises or in the Park caused directly by the negligent acts or
            gross misconduct of Landlord. In no event shall Landlord be
            obligated to indemnify Tenant for any Hazardous Materials which
            arise, as a result of the negligent acts or gross misconduct of
            Tenant, its officers, employees, agents, contractors or licensees.
            The covenants and indemnifications set forth in this Section 5.1.8
            shall survive the expiration or earlier termination of this Lease;
            and

     5.1.9  Tenant's Costs - In case Tenant shall, without any fault on its
            part, be made party to any litigation commenced by or against
            Landlord or by or against any parties in possession of the Premises
            or any part thereof claiming under Landlord, Landlord agrees to
            reimburse Tenant for all reasonable costs, including without implied
            limitation, reasonable counsel fees, incurred by or imposed upon
            Tenant in connection with such litigation and to pay all such
            reasonable costs and fees incurred in connection with the successful
            enforcement by Tenant of any obligations of Landlord under this
            Lease.

     5.1.10 Park Common Areas - To maintain the Building Park Area, Lot and
            Common Areas of the Park in the same manner as other first class
            office parks in the Bedford or Billerica, Massachusetts area.


                                       27
<PAGE>   32


     Except as specifically provided to the contrary in Section 4.2, Landlord
shall charge Tenant under the provisions of Section 4.2 for the costs incurred
by Landlord in connection with the services and/or repairs set forth in Sections
5.1.1, 5.1.2, 5.1.3, 5.1.6 and 5.1.10 above; provided, however, Landlord shall
be responsible to pay the following, at its sole cost and expense: (i)
replacements which are necessary to maintain the structural integrity of the
Building and (ii) during the initial ten (10) years of the Term, the water tight
integrity of the roof, reasonable wear and tear and damage and destruction due
to casualty or eminent domain or resulting from Tenant's negligence, or misuse,
or overloading as prohibited by Section 6.12, or by reason of Tenant's use of
the Premises other than for the Permitted Uses of the Lease, or by Tenant's
failure to perform its obligations under the Lease, or resulting from actions of
Tenant, Tenant's contractors, or Tenant's subcontractors which damage the roof
or wall systems or otherwise void or impair any then existing roof guarantees or
warranties excepted and (iii) maintenance and repairs (and replacements, if
necessary) covered by Landlord's or manufacturers warranties described in
Section 3.7 above.

5.2  INTERRUPTIONS

     Except as otherwise set forth in Article VII Landlord shall not be liable
to Tenant for any compensation or reduction of rent by reason of inconvenience
or annoyance or for loss of business arising from power losses or shortages or
from the necessity of Landlord's entering the Premises for any of the purposes
in this Lease authorized, or for repairing the Premises or any portion of the
Building or Lot. In case, notwithstanding Landlord's diligent efforts in
connection therewith (which such efforts shall never obligate Landlord to pay
for overtime and/or premium time work, or to pay a premium for expedited
delivery, except as such additional costs are so authorized and paid for by
Tenant), Landlord is prevented or delayed from making any repairs, alterations
or improvements, or furnishing any service or performing any other covenant or
duty to be performed on Landlord's part, by reason of any cause reasonably
beyond Landlord's control (expressly excluding Landlord's financial inability),
Landlord shall not be liable to Tenant therefore, nor, except as expressly
otherwise provided in Article VII, shall Tenant be entitled to any abatement or
reduction of rent by reason thereof, nor shall the same give rise to a claim in
Tenant's favor that such failure constitutes, actual or constructive, total or
partial, eviction from the Premises.

     Landlord reserves the right to stop any service or utility system when
necessary by reason of accident or emergency or until necessary repairs have
been completed. Except in case of emergency repairs, Landlord will give Tenant
reasonable advance notice of any contemplated stoppage and will use reasonable
efforts to avoid unnecessary inconvenience to Tenant by reason thereof.

                                   ARTICLE VI
                               TENANT'S COVENANTS

6.1  TENANT'S COVENANTS DURING THE TERM

     Tenant covenants during the Term:


                                       28
<PAGE>   33


     6.1.1 Tenant's Payments - To pay when due (a) all Fixed Rent and additional
           rent, (b) all taxes which may be imposed on Tenant's personal
           property in the Premises (including, without limitation, Tenant's
           fixtures and equipment) (c) directly to the utility provider (if not
           payable to Landlord), subject however, to Tenant's right to contest
           and seek abatement thereof, all charges by public utility for
           electricity, gas, telephone and other utility services (including
           service inspections therefor and the charges as may be imposed
           pursuant to Exhibit D hereof) rendered to the Premises and (d) as
           additional rent, all reasonable charges of Landlord for services
           rendered pursuant to Section 5.1.1, 5.1.2, 5.1.3, 5.1.6 and 5.1.10
           hereof, except as set forth in the last Section of Section 5.1.

     6.1.2 Repairs and Yielding Up - Except as otherwise provided in Article VII
           and Section 5.1.3, to keep the interior, non-structural elements of
           the Premises in good order, repair and condition, reasonable wear and
           damage or destruction by casualty or eminent domain excepted, and at
           the expiration or termination of this Lease peaceably to yield up the
           Premises and all changes and additions therein in such order, repair
           and condition, first removing all goods and effects of Tenant and any
           items, the removal of which is required by Sections 3.1 or 6.1.15 or
           by agreement or specified therein to be removed at Tenant's election
           and which Tenant elects to remove, and repairing all damage caused by
           such removal and leaving them clean and neat; any property not so
           removed shall be deemed abandoned and may be removed and disposed of
           by Landlord, in such manner as Landlord shall determine, and Tenant
           shall pay Landlord the entire reasonable cost and expense incurred by
           it by effecting such removal and disposition;

     6.1.3 Occupancy and Use - To use and occupy the Premises only for the
           Permitted Uses; and not to injure or deface the Premises, Building or
           Lot; and not to permit in the Premises any auction sale, nuisance, or
           the emission from the Premises of any objectionable noise or odor,
           nor to permit any use thereof which is improper, offensive, contrary
           to law or ordinances, or liable to invalidate or increase the
           premiums for any insurance on the Building or its contents or liable
           to render necessary any alteration or addition to the Building,
           unless Tenant agrees to pay such increased premiums and/or costs, and
           such use (if other than Permitted Uses) is approved by Landlord in
           advance;

     6.1.4 Rules and Regulations - To comply with the Rules and Regulations set
           forth in Exhibit E and all other reasonable Rules and Regulations
           hereafter made by Landlord, of which Tenant has been given notice,
           for the care and use of the Building, Lot and Common Areas of the
           Park (and their facilities and approaches as further described in the
           Park Covenants attached hereto as Exhibit I), it being understood
           that Landlord shall not be liable to Tenant for the failure of other
           tenants of the Building or Park to conform to such Rules and
           Regulations; provided that (i) such Rules and Regulations are
           enforced in a non-discriminatory


                                       29
<PAGE>   34


           fashion, and (ii) such Rules and Regulations do not materially
           interfere with Tenant's use of the Premises and the Building Parking
           Area.

     6.1.5 Compliance with Laws and Safety Appliances - To keep, from and after
           the initial installation thereof by Landlord, the Premises equipped
           with all safety appliances required by law or ordinance or any other
           regulation of any and public authority and to procure and comply with
           all licenses and permits so required, it being understood that the
           foregoing provisions shall not be construed to broaden in any way
           Tenant's Permitted Uses. Tenant shall have the right, upon giving
           notice to the Landlord, to contest any obligation imposed upon it
           pursuant to the provisions of this Section 6.1.5, and provided the
           enforcement of such requirement or law is stayed during such contest
           and such contest will not subject the Landlord to penalty or
           jeopardize the title to the Premises or otherwise affect the Premises
           in any adverse way. Landlord shall cooperate with Tenant in such
           contest and shall execute any documents reasonably required in the
           furtherance of such purpose. During the last three (3) years of the
           Term, as it may be extended, any capital items in the Base Building
           required to be installed by Tenant in the Premises after the Term
           Commencement Date as hereinabove provided, having a useful life
           greater than the remaining Term of the Lease shall be paid for by
           Tenant in an amount equal to the cost of such capital item multiplied
           by a fraction, the numerator of which shall be equal to the number of
           months remaining in the balance of the Term (including any exercised
           Extension Options) and the denominator equal to the number of months
           of the useful life of such capital item. Should Tenant later extend
           the Term of this Lease, then on the first day of any such Extension
           Term, Tenant shall pay as additional rent, an additional
           reimbursement toward the cost of such previously replaced capita item
           equal to the cost of such replaced item multiplied by a fraction, the
           numerator of which equal the number of months in the Extension Term,
           and the denominator equal to the remaining useful life of said
           replaced item as originally estimated hereunder. Whenever the
           fraction is equal to or greater than one, then the fractional value
           shall be equal to one (1). Notwithstanding the foregoing or any other
           provision of this Lease, however, Tenant shall not be responsible for
           compliance with any such laws, regulations, or the like requiring (i)
           structural repairs or modifications or (ii) repairs or modifications
           to the utility or building service equipment located outside of and
           not exclusively serving the Premises;

     6.1.6 Assignment and Subletting - Tenant shall have the right, subject to
           the requirement of obtaining Landlord's prior written consent, such
           consent not to be unreasonably withheld or delayed by Landlord, to
           assign this Lease or sublet the whole or any portion of the Premises,
           which assignment or sublease shall be only for the Permitted Uses, it
           being understood that Tenant shall, as additional rent, reimburse
           Landlord promptly for reasonable legal and other expenses incurred by
           Landlord in connection with any request by Tenant for consent to
           assignment or subletting. No assignment or subletting shall affect
           the continuing primary liability of Tenant (which, following
           assignment, shall be joint and several with


                                       30
<PAGE>   35


          the assignee). Such consent by Landlord to any of the foregoing in a
          specific instance (i) shall be reasonable, subject to the provisions
          hereinafter provided, and (ii) shall be subject to the prior written
          approval of Landlord's mortgagee(s). Landlord's consent shall not be
          treated as having been withheld unreasonably if, in connection with
          any such proposed assignment or subletting: (i) the terms of the
          proposed assignment or subletting do not prohibit further assignments
          of the Lease or subletting of the Premises without the written consent
          of Landlord, the granting of which consent shall be subject to the
          terms and conditions hereof, and in any event shall not be
          unreasonably withheld or delayed; and/or (ii) in connection with an
          assignment of this Lease, the assignee does not agree 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
          without the written consent of Landlord; and/or (iii) the proposed
          assignment or subletting violates an exclusive use restriction of the
          Building or Park. Tenant hereby acknowledges and agrees that the
          foregoing is not intended to be an exclusive list of the reasons for
          which Landlord may reasonably withhold consent to a proposed request
          by Tenant for consent to assignment or subletting. No consent to any
          of the foregoing in a specific instance shall operate as waiver in any
          subsequent instance. In addition, Tenant shall not have the right to
          transfer or convey to any sublessee(s) other than to a Permitted
          Transferee (as defined below), any renewal, expansion, or first
          refusal rights of Tenant set forth in this Lease.

          If an assignment or subletting is proposed to be made and Landlord's
          consent is required as hereinabove provided, Tenant shall give
          Landlord prior notice of such proposal, which such notice shall
          include such information as Landlord may reasonably request relative
          to facts which would bear upon the factors entering into the
          determination whether Landlord's approval is to be granted, and it is
          understood that Landlord shall use diligent efforts within a period of
          thirty (30) days after the submission of such information by Tenant to
          make its determination whether Landlord's approval is to be granted
          hereunder.

          Notwithstanding any provision contained in this Lease, no consent of
          Landlord shall be required for the assignment of this Lease or the
          subletting of any portion (or all) of the Premises for the Permitted
          Uses, (i) to a subsidiary of Tenant, (ii) to a corporation or other
          entity into or with which Tenant has merged or consolidated or to
          which substantially all of Tenant's stock or assets are transferred,
          (iii) to any corporation or other entity which controls, is controlled
          by, or is under common control with Tenant, or (iv) to any corporation
          or other entity with which Tenant is otherwise affiliated
          (collectively, the "Permitted Transferees"); provided that, in any of
          such events, (x) Tenant shall remain directly and primarily liable,
          and (y) any such sublessee or assignee agrees directly with Landlord
          by written instrument reasonably satisfactory to Landlord and such
          assignee or sublessee to be bound by all of the obligations of Tenant.
          In the event of any such assignment


                                       31
<PAGE>   36


          or subletting for which no consent by Landlord is required hereunder,
          Tenant shall not be obligated to share Rent Differential as
          hereinafter set forth.

          If this Lease shall be assigned, or if the Premises or any part hereof
          shall be sublet or occupied by any person other than Tenant, Landlord
          may, at any time and from time to time, collect rent from the
          assignee, subtenant or occupant and apply the net amount collected to
          the annual Fixed Rent, additional rent and all other charges herein
          reserved, but no such assignment, subletting, occupancy or collection
          shall be deemed a waiver of the provisions of this Section 6.1.6, or
          acceptance of the assignee, subtenant or occupant as tenant, or a
          release of Tenant from the further performance of the terms, covenants
          and conditions of this Lease on the part of Tenant to be performed.
          Further, no liability hereunder of Tenant shall be discharged,
          reduced, released or impaired in any respect by any waiver, indulgence
          or extension of time which Landlord may grant to the then owner of
          Tenant's interest in this Lease, whether or not notice thereof has
          been given or consent from Tenant has been obtained.

          Landlord shall have the option to require that any portion of rental
          received by Tenant from subtenant or assignee to which Landlord is
          entitled pursuant to this Section 6.1.6 be remitted directly to
          Landlord, provided that such amounts are credited pro tanto against
          Tenant's rental obligations.

          If Landlord approves a sublease or assignment, and said sublease or
          assignment is for a total rental amount which on an annualized basis
          is greater than the unreduced Fixed Rent plus three dollars and sixty
          three cents ($3.63) per square foot (as set forth in Section 3.8 of
          this Lease) and additional rent due from Tenant to Landlord under this
          Lease, Tenant shall pay to Landlord, forthwith upon Tenant's receipt
          of each installment of such excess rent, during the term of any
          approved sublease or assignment, as additional rent hereunder, in
          addition to the Fixed Rent and other payments due under this Lease, an
          amount equal to fifty percent (50%) of the positive excess between all
          fixed rent and additional rent received by Tenant under the sublease
          or assignment and the unreduced Fixed Rent (as set forth in Section
          3.8 of this Lease) plus three dollars and sixty three cents ($3.63)
          per square foot and the additional rent due hereunder after Tenant has
          recouped its reasonable out-of-pocket expenses with respect to such
          sublease or assignment, including without limitation, reasonable real
          estate brokerage commissions, reasonable legal fees, reasonable free
          rent, reasonable marketing costs and the reasonable costs of
          refurbishment of the Premises for such sublease or assignment (the
          "Rent Differential"). The fifty percent (50%) figure set forth in the
          immediately preceding sentence shall apply unless and until the Tenant
          has sublet or assigned fifty percent (50%) of the Premises; after the
          time in which Tenant subleases more than fifty percent (50%) of the
          Premises the percentage payable to the Landlord as hereinabove
          provided shall increase on all sublease(s) and any assignment to equal
          the percentage of the Premises being subleased or assigned (by way of
          example and not limitation if Tenant subleased seventy-five


                                       32
<PAGE>   37


            percent (75%) of the Premises, Landlord would be entitled to
            seventy-five percent (75%) in the calculation of the Rent
            Differential set forth above). In the event the sublease is for less
            than the full Premises hereunder, the above rent adjustment shall be
            equitably pro rated on a square foot basis. Anything contained in
            the foregoing provisions of this section to the contrary
            notwithstanding, neither Tenant nor any other person having interest
            in the possession, use, occupancy or utilization of the Premises
            shall enter into any lease, sublease, license, concession or other
            agreement for use, occupancy or utilization of space in the Premises
            which provides for rental or other payment for such use, occupancy
            or utilization based, in whole or primarily on the net income or
            profits derived by any person from the Premises leased, used,
            occupied or utilized (other than an amount based on a fixed
            percentage or percentages of receipts or sales), and any such
            purported lease, sublease, license, concession or other agreement
            shall be absolutely void and ineffective as a conveyance of any
            right or interest in the possession use, occupancy or utilization of
            any part of the Premises;

     6.1.7  Indemnity - To defend, with counsel reasonably acceptable to
            Landlord, save harmless, and indemnify Landlord from any liability
            for injury, loss, accident or damage to any person or property
            occurring on the Premises, in the Building, or elsewhere in the
            Park, and from any claims, actions, proceedings and expenses and
            costs in connection therewith or elsewhere in the Park (including,
            without implied limitation, reasonable counsel fees): (i) arising
            from the negligent acts or gross misconduct of Tenant or any of
            Tenant's employees, agents, contractors, licensees or invitees and
            not caused directly by the negligent acts or gross misconduct of
            Landlord, or (ii) resulting from the failure of Tenant to perform
            and discharge its covenants and obligations under this Lease. In no
            event shall Tenant be obligated to indemnify Landlord for any
            willful or negligent act or omission of Landlord or any of
            Landlord's employees, agents, contractors or licensees. The
            covenants and indemnifications set forth in this Section 6.1.7 shall
            survive the expiration or earlier termination of this Lease;

     6.1.8  Tenant's Liability Insurance - To maintain public liability
            insurance in the Premises in amounts which shall, at the beginning
            of the Term, be at least equal to the limits set forth in Section
            1.1 and from time to time during the Term, shall be for such higher
            limits, if any, as are customarily carried in the area in which the
            Premises are located on property similar to the Premises and used
            for similar purposes and, upon written request therefor, to furnish
            Landlord (and/or its mortgagees) with certificates thereof;

     6.1.9  Tenant's Workers' Compensation Insurance - To keep all Tenant's
            employees working in the Premises covered by workers' compensation
            insurance in statutory amounts and to furnish Landlord with
            certificates thereof;

     6.1.10 Landlord's Right of Entry - Signs and Flags - Upon not less than
            twenty-four (24) hours advance notice (except in the event of
            emergencies), to permit Landlord and


                                       33
<PAGE>   38


            Landlord's agents entry; to examine the Premises at reasonable times
            and, if Landlord shall so elect, to make repairs or replacements; to
            remove, at Tenant's expense, any changes, additions, signs,
            curtains, blinds, shades, awnings, aerials, flagpoles, or other
            improvements visible outside the Building not consented to in
            writing; Landlord acknowledging and agreeing however that Tenant
            shall have the right, subject to Tenant obtaining all necessary
            governmental permits and approvals, to install and maintain three
            flag poles as well as one placard monument sign with Tenant's logo,
            the latter only if permitted as of right by the Town of Bedford,
            Massachusetts Bylaws, to be located in front of the Building,
            outside of the Building Parking Area and mutually acceptable to
            Landlord and Tenant. Tenant shall reimburse Landlord for the actual
            third party costs and expenses incurred by Landlord in connection
            with obtaining said permits and approvals, including reasonable
            attorney fees and disbursements; Tenant agrees to cooperate with
            Landlord during the permitting process by (i) promptly executing the
            necessary documentation requested by Landlord, and (ii) by
            furnishing the same to Landlord promptly upon Landlord's request,
            but in no event later than seven (7) days following Landlord's
            request. Further the construction, erection and maintenance of such
            flag poles and such placard monument signage shall be the Tenant's
            sole responsibility and at Tenant's sole cost and expense; and to
            show the Premises to prospective tenants during the twelve (12)
            months preceding expiration of the Term and to prospective
            purchasers and mortgagees at all reasonable times;

     6.1.11 Loading - Not to place a load upon the Premises exceeding an average
            rate of one hundred (100) pounds of live load per square foot of
            floor area; and not to move any safe, vault or other heavy equipment
            in, about or out of the Premises except in such a manner and at such
            times as Landlord shall in each instance approve; Tenant's business
            machines and mechanical equipment which cause vibration or noise
            that may be transmitted to the Building structure shall be placed
            and maintained by Tenant in settings of cork, rubber, spring, or
            other types of vibration eliminators sufficient to eliminate such
            vibration or noise;

     6.1.12 Landlord's Costs - In case Landlord shall, without any fault on its
            part, be made party to any litigation commenced by or against Tenant
            or by any party claiming under Tenant, to pay, as additional rent,
            all actual third party reasonable costs including, without implied
            limitation, reasonable counsel fees incurred by or imposed upon
            Landlord in connection with such litigation, and, as additional
            rent, also to pay all such reasonable costs and fees incurred by
            Landlord in connection with the successful enforcement by Landlord
            of any obligations of Tenant under this Lease;

     6.1.13 Tenant's Property - All the furnishings, fixtures, equipment,
            effects and property of every kind, nature and description of Tenant
            and of all persons claiming by, through or under Tenant which,
            during the continuance of this Lease or any occupancy of the
            Premises by Tenant or anyone claiming under Tenant, may be on


                                       34
<PAGE>   39


            the Premises or on the Lot shall be at the sole risk and hazard of
            Tenant, except for Landlord's gross negligence or willful act or
            omission, and if the whole or any part thereof shall be destroyed or
            damaged by fire, water or otherwise, or by the leakage or bursting
            of water pipes, steam pipes, or other pipes, by theft, or from any
            other cause, no part of said loss or damage is to be charged to or
            to be borne by Landlord, except if caused directly by Landlord's
            gross negligence or willful misconduct;

     6.1.14 Labor or Materialmen's Liens - To pay promptly when due the entire
            cost of any work done on the Premises by Tenant, its agents,
            employees, or independent contractors; not to cause or permit any
            liens for labor or material performed or furnished in connection
            therewith to attach to the Premises; and within ten (10) days after
            Tenant's receipt of notice thereof, to discharge or bond over with a
            bond satisfactory to Landlord and Landlord's mortgagee(s) any such
            liens which may so attach;

     6.1.15 Changes or Additions - Not to make any material changes or additions
            to the Premises without Landlord's prior written consent, which such
            consent shall not be unreasonably withheld or delayed.
            Notwithstanding the foregoing, Tenant may, from time to time, at its
            own cost and expense and without the consent of Landlord, make
            non-structural alterations, additions or improvements to the
            Premises, so long as they do not affect any of the mechanical,
            electrical or plumbing systems of the Building (collectively herein
            called "Alterations") whose cost in any one instance is Fifty
            Thousand Dollars ($50,000.00) or less, provided that Tenant first
            notifies Landlord in writing of any such Alterations. If Tenant
            desires to make any Alterations costing in excess of Fifty Thousand
            Dollars ($50,000.00) in any one instance or any other alteration,
            including any structural alteration or alteration affecting any of
            the mechanical, electrical or plumbing systems of the Building,
            Tenant must first obtain the consent of Landlord thereto, which
            consent shall not be unreasonably withheld or delayed. If Landlord
            reasonably concludes that the Alterations involve any construction,
            alterations or additions requiring unusual expense to readapt the
            Premises to normal office use on the Term Expiration Date, Landlord
            shall notify Tenant in writing at the time of approval that such
            readaptation will be required to be made by Tenant prior to such
            Term Expiration Date without expense to Landlord.

            Any and all such alterations, including Alterations, may be done by
            any contractor chosen by Tenant provided any such contractor is
            reputable, bondable by reputable bonding companies, carries the kind
            of insurance and in the amounts set forth herein, and will work in
            harmony with Landlord's contractors and laborers in the Building;

            Tenant shall ensure that its contractors and subcontractors procure
            and maintain insurance as required by Tenant's Contractors and
            Subcontractors Minimum Insurance Requirements set forth in Exhibit
            "H" of this Lease.


                                       35
<PAGE>   40


            Tenant in making any alterations, including Alterations, shall cause
            all work to be done in a good and workmanlike manner using materials
            substantially equal to or better than those used in the construction
            of the Premises or original Tenant's Work and shall comply with or
            cause compliance with all laws and with any direction given by any
            public officer pursuant to law. Tenant shall obtain or cause to be
            obtained and maintain in effect, as necessary, all building permits,
            licenses, temporary and permanent certificates of occupancy and
            other governmental approvals which may be required in connection
            with the making of the alterations, including the Alterations.
            Landlord shall cooperate with Tenant in the obtaining such permits,
            licenses and approvals and shall execute any documents reasonably
            required in furtherance of such purpose, provided any such
            cooperation shall be without expense and/or liability to Landlord.

            At least annually if such Alterations or any other alterations
            hereunder have occurred during the past calendar year, Tenant shall
            furnish to Landlord as-built sepias and, if applicable, operating
            manuals, or, at Landlord's option and only if Tenant's computer
            system is compatible with that of Landlord's, computer disk
            specifications compatible with Landlord's computer system of the
            work done by Tenant during such past year and copies of all permits
            issued in connection therewith.

            Tenant shall have its contractor procure and maintain in effect
            during the term of such alterations, including Alterations,
            satisfactory insurance coverages with an insurance company or
            companies authorized to do business in the Commonwealth of
            Massachusetts, and shall, upon Landlord's request, furnish Landlord
            with certificates thereof;

     6.1.16 Holdover - To pay to Landlord two hundred percent (200%) the total
            of the Fixed and additional rent then applicable for each month or
            portion thereof Tenant shall retain possession of the Premises or
            any part thereof after the termination of this Lease, whether by
            lapse of time or otherwise; provided however that Tenant shall be
            responsible to pay to Landlord only one hundred twenty-five (125%)
            percent of the total Fixed Rent and additional rent then applicable
            for the first (60) sixty days Tenant retains possession of the
            Premises or any part thereof after termination of this Lease. The
            provisions of this subsection shall not operate as a waiver by
            Landlord of any right of re-entry provided in this Lease;

     6.1.17 Hazardous Materials - Tenant shall not (either with or without
            negligence) cause or permit the escape, disposal or release of any
            biologically or chemically active or other hazardous substances or
            materials onto the Premises or the Lot, except in accordance with
            the requirements of applicable laws and regulations. Tenant shall
            not allow the storage or use of such substances or materials in any
            manner not permitted by law, nor allow to be brought into the
            Premises any such materials or substances except to use in the
            ordinary course of Tenant's business. Upon


                                       36
<PAGE>   41


            Landlord's written request, Tenant shall furnish to Landlord an
            inventory of the identity of such substances or materials used in
            the ordinary course of Tenant's business. Without limitation,
            hazardous substances and materials shall include those described in
            the Comprehensive Environmental Response, Compensation and Liability
            Act of 1980, as amended, 42 U.S.C. Section 9601 et seq., the
            Resource Conservation and Recovery Act, as amended, 42 U.S.C.
            Section 6901 et seq., the Massachusetts Hazardous Waste Management
            Act, as amended, M.G.L. c.21C, the Massachusetts Oil and Hazardous
            Material Release Prevention and Response Act, as amended, M.G.L.
            c.21E, any applicable local ordinance or bylaw, and the regulations
            adopted under these acts, as amended (collectively, the "Hazardous
            Waste Laws"). If any lender or governmental agency shall ever
            require testing to ascertain whether or not there has been any
            release of hazardous substances or materials, then the reasonable
            costs thereof shall be reimbursed by Tenant to Landlord upon demand
            as additional charges if and only if the following conditions are
            satisfied; (i) if such requirement applies to the Premises and (ii)
            if an independent, reputable third party engineer employed by
            Landlord or persons acting under Landlord conclusively determines
            that such release had been or is likely to have been solely and
            exclusively caused by Tenant or persons acting under Tenant. If
            Tenant receives from any federal, state or local governmental agency
            any notice of violation or alleged violation of any Hazardous Waste
            Law, or if Tenant is obligated to give any notice under any
            Hazardous Waste Law, Tenant agrees to forward to Landlord a copy of
            any such notice within three (3) days of Tenant's receipt or
            transmittal thereof. In addition, Tenant shall execute affidavits,
            representations and the like from time to time at Landlord's request
            concerning Tenant's best knowledge or belief regarding the presence
            of hazardous substances or materials on the Premises. In all events,
            Tenant shall indemnify Landlord in the manner provided in Section
            6.1.7 of this Lease from any release of hazardous substances or
            materials on the Premises or elsewhere in the Park to the extent
            caused by Tenant or persons acting under Tenant. Notwithstanding the
            immediately preceding sentence, after deducting all of Landlord's
            costs, if any, Landlord will credit Tenant with any net insurance
            proceeds received by Landlord from any Pollution and Remediation
            Legal Liability insurance policy in effect covering the Premises.
            Landlord retains the right to inspect the Premises at all reasonable
            times, upon reasonable notice to Tenant, to ensure compliance with
            this Section. The within covenants shall survive the expiration or
            earlier termination of the Term;

     6.1.18 Signs - Tenant shall not, without prior written consent of Landlord
            (which such consent shall not be unreasonably withheld or denied but
            may be withheld in Landlord's sole discretion if Tenant is then in
            default of this Lease beyond any applicable cure periods or if
            Tenant is not then leasing at least seventy-five percent (75%) of
            the Building) (for purposes of this 75% determination, space
            subleased to others by Tenant will not be deducted from Tenant's
            Leased Premises), (a) place any exterior signs visible outside the
            Building, on the Lot or the Premises or anywhere on the exterior of
            the Building, or (b) place any


                                       37
<PAGE>   42


          curtains, blinds (other than standard vertical blinds), shades,
          awnings, or flagpoles, or the like, in the Premises or anywhere on or
          in the Building visible from outside the Premises, except as otherwise
          expressly set forth below in this Section 6.1.18 or elsewhere in this
          Lease. Tenant shall pay the expenses involved in the erection of any
          sign and of obtaining all necessary permits and approvals therefor.
          Except as otherwise provided below with respect to the initial
          Building signage, Tenant warrants that it shall obtain (and furnish
          copies thereof to Landlord) all necessary permits and approvals in
          compliance with local codes and ordinances prior to erecting any such
          sign(s) and that all of such signage shall be in accordance with
          first-class building standards. Tenant shall remove any of such
          sign(s) erected by Tenant or on behalf of Tenant upon the termination
          of this Lease.

          In connection with Tenant's initial Building signage, Landlord shall
          use reasonable efforts to obtain, on Tenant's behalf, all necessary
          permits and approvals required pursuant to local codes and ordinances
          for the building and site signage (i.e., two signs on the Building
          facade, signage on the entrance sign of the Park, and signage on the
          Building directory and on any other applicable floor directories of
          the Building) set forth and described in Exhibit H hereto. Tenant's
          Building and Lot signage shall be exclusive until such time as Tenant
          fails to lease at least seventy-five percent (75%) of the Building or
          Tenant defaults in the terms of this Lease beyond applicable cure
          periods. In addition thereto, provided Tenant is the sole tenant in
          the Park, Tenant shall have the right, subject to all applicable laws,
          ordinances and regulations and subject to Tenant obtaining all
          necessary permits and approvals required pursuant to all applicable
          laws to install and maintain one placard monument sign at the entrance
          to the Park and one monument sign immediately adjacent to the
          Building. If Tenant is not the sole tenant in the Park then so long as
          Tenant is leasing at least two (2) entire buildings in the Park, if
          Tenant can obtain the required permits and approvals for two (2)
          monument signs at the entrance to the Park, subject to Tenant
          obtaining all necessary permits and approvals for both such signs,
          then Tenant shall be entitled to install and maintain one such sign,
          the choice of the two sign locations to be the Landlord's. Tenant
          shall reimburse Landlord for the actual third-party reasonable costs
          and expenses incurred by Landlord in connection with obtaining said
          permits and approvals, including reasonable attorneys fees and
          disbursements. Tenant agrees to cooperate with Landlord during the
          permitting process by (i) promptly executing the necessary
          documentation reasonably requested by Landlord, and (ii) by furnishing
          the same to Landlord promptly upon Landlord's request, but in no event
          later than seven (7) days following Landlord's request. Further, the
          construction, erection and maintenance of any such signage shall be
          Tenant's sole responsibility and at Tenant's sole cost and expense.
          Notwithstanding the foregoing, Landlord and Tenant agree (i) that the
          cost of the signage on the Building's directory and on other
          applicable floor directories shall be borne by Landlord, with the
          graphics cost/placement being the responsibility of the Tenant, and
          (ii) that Tenant shall have the right, at its sole cost, to place its


                                       38
<PAGE>   43


            corporate logo on the entrance door to the Premises and elsewhere
            within the Premises;

     6.1.19 LIGHTING RESTRICTIONS - Landlord is obliged under agreements with
            the Town of Bedford, Massachusetts to ensure that all interior
            lights in the Building (except for emergency lights) that are on the
            northwest (front) side of the Building, or are readily visible from
            the northwest side of the Building be controlled by motion detector
            shut offs that will turn off such lights in such spaces when motion
            is not detected therein. Such switches will be installed in such
            Tenant Space. Landlord shall reimburse Tenant the initial marginal
            cost of installing such motion detector switches.

     6.1.20 TRANSPORTATION DEMAND MANAGEMENT PLAN - This property is subject to
            a Special Permit from the Town of Bedford, Massachusetts for
            increased number of parking spaces. The Tenant agrees to
            cooperatively participate in, and actively support, Landlord's
            and/or the Park's Transportation Demand Management Plan wherever
            possible to achieve the Park's goal of peak hour traffic reduction.
            Tenant shall reimburse Landlord for its pro rata share of Landlord's
            Transportation Demand Management Plan expenses which may include
            such services as:

               -    Access GIS/Rideshare to assist in matching interested
                    employees into car-pools and vanpools.

               -    Provide a "Guaranteed Ride" program which provides a back-up
                    in the event of an emergency;

               -    Promotional events at their facilities to distribute
                    transportation information and answer questions;

               -    Operate a "transportation store" to provide up-to-date
                    information on transit schedules, services, and fares;

               -    Organize van-pools;

               -    Work with state agencies including MassHighway, EOTC,
                    CARAVAN Commuters, or others, as necessary on transportation
                    matters; and

               -    Implement preferential parking for rideshares.

     6.1.21 TELECOMMUNICATIONS AND ROOFTOP INSTALLATIONS - Tenant is hereby
            granted the right, subject to applicable law and the last sentence
            of this Section 6.1.21 to use the roof of the Building (the "Roof")
            for the installation, operation and maintenance, at Tenant's sole
            cost and expense, of such telecommunications equipment and devices
            thereon as Tenant shall elect to install and operate in its
            reasonable discretion (subject to the limitations in this Section
            6.1.21). Tenant's


                                       39
<PAGE>   44


          Rooftop Improvements shall not (a) have any material adverse impact on
          the structural integrity of the Building or roof, (b) void a roof
          membrane warranty or guaranty, or materially and adversely disturb or
          otherwise affect the architectural integrity of the Building, (c) be
          substantially dissimilar from those generally installed on other
          similar office and research and development buildings of which Tenant
          is the owner or a substantial occupant, or (d) be used for
          telecommunications services for the benefit of persons or entities
          other than Tenant or any subtenant or assignee of Tenant (it being
          agreed that the sale of telecommunications services to members of the
          public is not included within the rights granted to Tenant under this
          Section 6.1.21), but is reserved to Landlord. Prior to the
          installation of any Rooftop Improvements, Tenant shall obtain and
          submit to Landlord (x) for its approval, plans and specifications for
          the proposed Rooftop Improvements (including its size, location,
          height, weight and function), along with copies of all required
          permits and licenses required from all applicable governmental
          authorities, and (y) if Tenant so elects, a request that Landlord not
          require Tenant to remove the Rooftop Improvements at the end of the
          Term. Such approval under clause (x) shall be limited to determining
          only that Tenant has obtained all required permits and licenses for
          the installation and operation of the Rooftop Improvement(s), that the
          Rooftop Improvement(s) comply with all applicable laws, and that
          Tenant has satisfied the other conditions set forth in this Section
          6.1.21 and such decision regarding non-removal under clause (y) shall
          be at Landlord's sole discretion. Should Landlord, in its reasonable
          judgment, deem it necessary to have Tenant's plans and specifications
          for Rooftop Improvements reviewed by a structural engineer, Tenant
          shall reimburse Landlord the reasonable cost of such review as
          Additional Rent within sixty (60) days of billing therefore. In the
          event this Lease is subsequently amended and Tenant is no longer the
          sole tenant in the Building and a third-party is also a tenant in the
          Building, Tenant's rights to use the roof shall be proportionate to
          the portion of the Building then leased by Tenant and Tenant agrees to
          abide by the following terms and conditions: (1) Prior to the
          commencement of installation of any Rooftop Improvement, Tenant shall
          have in effect and shall deliver to Landlord evidence of the insurance
          coverages required under this Lease and that such insurance includes
          coverage of the Rooftop Improvement. Such insurance shall name
          Landlord and each mortgagee of the Premises of which Tenant has notice
          as an additional insured or loss payee, as its interest may appear,
          where appropriate; (2) At all times during the installation process,
          Tenant will exhibit any required low voltage permit, building permit,
          and/or any other permits to be issued. Tenant hereby confirms that it
          shall at all times during the installation or removal process or
          during any use, maintenance and repair of any Rooftop Improvement,
          comply with all building, safety, fire, plumbing, electrical and other
          codes and governmental insurance requirements and roof warranty
          requirements, as more fully set forth in the Lease; (3) As soon as
          practicable during the installation of any Rooftop Improvement,
          Tenant, at its sol cost and expense (i) will seal any wall
          penetrations occurring by reason of the installation process inside
          the ceiling plenum, and (ii) will have any roof penetrations occurring
          by reason of the


                                       40
<PAGE>   45


          installation process sealed by a roofing subcontractor selected by
          Tenant and approved by Landlord; (4) Tenant agrees to indemnify,
          defend and hold Landlord and any Landlord related party and each
          mortgagee of the Premises and Landlord's contractors harmless from any
          damage to any tangible property or bodily injury to, or death of, any
          person arising from the installation, maintenance, operation and
          continued use of the Rooftop Improvements by Tenant or its agents,
          assignees, subtenants, employees, representatives, contractors or
          invitees; (5) Tenant shall keep the Premises, the Building and the
          Rooftop Improvements free and clear of any liens arising from any work
          performed, materials furnished or obligations incurred by or at the
          request of Tenant, its agents, employees or independent contractors
          and (6) Tenant shall keep the Rooftop Improvements, and every part
          thereof, in good condition and repair at all times during the Term and
          at Tenant's sole cost and expense.

     Unless Landlord has previously approved Tenant's non-removal of the Rooftop
Improvements at the end of the term pursuant to Section 6.1.21 B, Tenant shall
remove all Rooftop Improvements at the expiration of the Term and restore the
area where the Rooftop Improvements were located to its original condition, at
Tenant's sole expense; all such removal of Rooftop Improvements shall be done in
a manner that will not have any material adverse impact on the structural
integrity of the Building or Roof and will not void a Roof membrane warranty or
guaranty.

     6.1.22 Tenant's Authority - Tenant has the power and authority to enter
            into this Lease and perform the obligations of Tenant hereunder.
            This Lease and all other documents executed and delivered by Tenant
            in connection herewith constitute legal, valid, binding and
            enforceable obligations of Tenant; and

     6.1.23 Confidentiality - This Lease document is a confidential document by
            and between Landlord and Tenant and Tenant agrees that this Lease
            shall not be copied and distributed or circulated to any person(s)
            other than to such parties, and their respective mortgagees,
            successors or assigns, their legal counsel or their accountants or
            to any prospective sublessees and assignees or affiliates of Tenant,
            or to any prospective acquirers, investors, or lenders of Tenant, or
            to regulatory authorities, or to the directors, shareholders or
            officers of Tenant, or as required by law, without the prior written
            consent of Landlord. Nothing contained in this Section shall
            prohibit the disclosure by Tenant of the essential terms of this
            Lease.

                                   ARTICLE VII
                               CASUALTY AND TAKING

7.1  CASUALTY AND TAKING

     In case during the Term all or any substantial part of the Premises, and/or
the Building Parking Area, or any part thereof, or both (i.e. in the case of a
fire or casualty, requiring greater than twelve (12) months to rebuild in
Landlord's reasonable judgment; or in the case of a


                                       41
<PAGE>   46


condemnation or a taking, more than thirty-five percent (35%) of the floor area
of the Premises or any material part of the means of access thereto or more than
twenty-five percent (25%) of Building Parking Area) are damaged by fire or any
other casualty or by action of public or other authority in consequence thereof
or are taken by eminent domain Landlord shall give prompt notice, (i.e. within
thirty (30) days thereof) to Tenant (the "Landlord's Notice") and this Lease
shall terminate either at Landlord's or Tenant's election, which may be made by
notice given to the other within thirty (30) days after the date of Landlord's
Notice, which termination shall be effective (i) in the event of a casualty, not
less than thirty (30) nor more than sixty (60) days after the date of notice of
such termination and (ii) in the event of eminent domain event, as of the date
on which such taking becomes effective and Tenant is deprived of the use and
enjoyment of the Premises, or part thereof, and/or the Building Parking Area, or
part thereof. In the event Landlord elects not to rebuild, then any insurance
proceeds actually received by Landlord shall, during the initial Term, be
allocated between Landlord and Tenant as follows: first, to Landlord's
mortgagee(s) up to the amount of the mortgage(s) then, to the Tenant an amount
equal to the sum of the amounts actually paid by Tenant to Landlord for the
Tenant's Work installed hereunder multiplied by a fraction the numerator of
which is the number of months remaining in the initial Term and denominator of
which is one hundred and eighty (180), plus the total amount of the Tenant's
Contribution to Landlord's Work multiplied by a fraction the numerator of which
is the number of months remaining in the initial Term plus (one hundred twenty
(120) months less any expired months in any extended terms) and denominator of
which is three hundred (300); then to Landlord or its mortgagee(s), as their
interests may appear, that certain portion of any remaining insurance proceeds.
Notwithstanding any language to the contrary, any and all of Landlord's
obligations to allocate to Tenant any such portion of the insurance proceeds
described in the preceding sentence shall be limited to the extent such proceeds
are actually received by Landlord.If in any such case the Lease is not so
terminated, Landlord shall proceed promptly and use due diligence to put the
Premises, or part thereof, and/or the Building Parking Area, or part thereof, or
in case of taking, what may remain thereof (excluding any items installed by
Tenant which Tenant may be permitted to remove upon the expiration of the Term)
into as near as possible to the condition and character thereof prior to such
damage or taking, and in any event shall apply all insurance proceeds or eminent
domain awards received by it toward such work, for use and occupation to the
extent permitted by the net award of insurance plus any deductibles and such
amounts as Tenant may elect to make available for such work as hereinafter
provided, or the amount of the eminent domain award, and an equitable proportion
of the Fixed Rent and additional rent according to the nature and extent of the
injury shall be abated until the Premises or such remainder and the Building
Parking Area shall have been put by Landlord in such condition; and in case of a
taking which permanently reduces the area of the Premises, an equitable
proportion of the Fixed Rent and additional rent shall be abated for the
remainder of the Term and an appropriate adjustment shall be made to the Annual
Estimated Operating Costs and other additional rent payable hereunder.


                                       42
<PAGE>   47


     However, in the case of a casualty, if such damage is not repaired and the
Premises, or portion thereof, and/or Building Parking Area or part thereof,
restored to the same condition as they were prior to such damage within twelve
(12) months from the date of Landlord's Notice, then Tenant, within thirty (30)
days from the expiration of such twelve (12) month period or from the expiration
of any extension thereof by reason of any Tenant's Delay (as defined in Section
3.2 hereof) and/or Force Majeure (as defined in Section 3.5 hereof and subject
to the provisions set forth below) as hereinafter provided, may terminate this
Lease by notice to Landlord and Landlord's mortgagee(s), given in accordance
with Section 10.3 hereof, specifying a date not more than thirty (30) days after
the giving of such notice on which the Term of this Lease shall terminate.
Notwithstanding such termination notice by Tenant, in the event that Landlord
repairs such damage and restores the Premises to the same condition prior to
such casualty during such period, not to exceed thirty (30) days, as specified
in Tenant's notice, then such notice of termination given by Tenant to Landlord
hereunder shall be null and void and of no further force or effect. The period
within which the required repairs may be accomplished hereunder shall be
extended by (a) the number of days lost as a result of a Tenant's Delay, as
defined in and subject to the provisions of Section 3.2, with such term,
however, relating to restoration or repair as referenced herein and not to the
initial construction of the Building, and (b) the number of days lost as a
result of Force Majeure, as defined in Section 3.5.

     If less than a substantial part of the Premises or Lot, or portion thereof,
and/or the Building Parking Area, or portion thereof (i.e. in the case of a fire
or casualty, requiring less than twelve (12) months to rebuild in Landlord's
reasonable judgment; or in the case of a condemnation or taking thirty-five
percent (35%) or less of the floor area of the Premises or any part of the means
of access thereto or twenty-five percent (25%) or less of the Building Parking
Area) are damaged by fire or any other casualty or are taken by eminent domain,
then Landlord shall give prompt notice (i.e. within thirty (30) days) thereof to
Tenant, which notice shall specify Landlord's estimation of the time period
within which such repairs shall be completed, and thereafter Landlord shall
proceed promptly and with due diligence to repair such damage and restore the
Premises to the extent permitted by the net award of insurance plus any
deductible amounts and such amount as Tenant may elect to make available for
such work as hereinafter provided, or the amount of the eminent domain award. In
the event that Landlord fails to repair such damage and restore the Premises to
substantially the same condition that existed prior to such fire or other
casualty within the time period as reasonably estimated by Landlord, plus sixty
(60) days but in no event greater than such twelve (12) month period from the
date of such Landlord's notice to Tenant, or any extension thereof permitted for
delays lost due to any Tenant's Delay and/or Force Majeure (as hereinbefore
provided), then Tenant may (i) terminate this Lease by written notice to
Landlord and to Landlord's mortgagee(s), as provided in Section 10.3 hereof,
specifying a date not more than thirty (30) days after the giving of such notice
on which the Term of this Lease shall terminate or (ii) after fifteen (15) days
written notice to Landlord, repair such damage itself, in which event, Landlord
shall pay to Tenant, after deducting Landlord's costs, if any, any net insurance
proceeds received by Landlord that are received for such casualty.
Notwithstanding such termination notice by Tenant, in the event that Landlord
repairs such damage and restores the Premises to substantially the same
condition prior to such fire or other casualty during such period, not to exceed
thirty (30) days, as specified in Tenant's notice, then such notice of
termination given by Tenant to Landlord hereunder shall be null and


                                       43
<PAGE>   48


void and of no further force and effect. If less than a substantial part of the
Premises and/or the Building Parking Area shall be so damaged, then Fixed Rent
and additional rent due hereunder shall be equitably abated until thirty (30)
days after the Premises and/or the Building Parking Area are so restored as set
forth hereunder.

     Landlord's architect's certificate, given in good faith, shall be deemed
conclusive statements therein contained and binding upon Tenant with respect to
the performance and completion of any repair or restoration work undertaken by
Landlord pursuant to this Section, except in the event of disagreement between
Landlord and Tenant relating to this Section, in which event the dispute
resolution provisions of Section 3.6 shall apply.

     Notwithstanding any language to the contrary, Landlord may construct
"Replacement Parking" pursuant to the following: If not more than thirty-five
percent (35%) of the Building Parking Area shall be so damaged, taken,
appropriated, or condemned as aforesaid, then Landlord may elect to provide
Replacement Parking and render Tenant's notice of termination nugatory (if
applicable) by, within thirty (30) days following the effective date of such
destruction, taking, appropriation or condemnation, giving to Tenant notice in
writing that Landlord will, at Landlord's expense, construct replacement parking
spaces of the same quantity and quality and convenience as the parking spaces so
taken, appropriated or condemned (i.e., Landlord using best efforts to locate
the replacement parking spaces as close to the Building as possible). Any of
such Replacement Parking shall be constructed by Landlord within a reasonable
time period following the effective date of such destruction, taking,
appropriation or condemnation, but in no event later than ninety (90) days after
the occurrence of such destruction, taking, appropriation or condemnation, it
being agreed by Landlord and Tenant that such time period shall be extended to
include weather-related delays as aforesaid, in which event such Replacement
Parking will be completed as reasonably possible thereafter, Landlord agreeing
to proceed promptly and with due diligence to complete construction of any
Replacement Parking. Landlord and Tenant acknowledge that if Landlord is
prevented from performing the final paving for said Replacement Parking on
account of weather, such final paving may be performed as soon thereafter as is
feasible. Such notice shall be accompanied by (A) a site plan showing (i) the
location of the Replacement Parking spaces, and (B) an opinion from counsel for
Landlord that such Replacement Parking may be constructed as-of-right under then
applicable zoning and land use regulations.

     In the event of any other taking of the Premises, or any part thereof, for
temporary use or for less than one (1) year, (i) this Lease shall be and remain
unaffected thereby; and (ii) Landlord shall pay to Tenant its pro rata share of
any such award, provided that if any taking is for a period extending beyond the
Term of this Lease, such award shall be appointed between Landlord and Tenant as
of the Term Expiration Date.

     Tenant has the option but not the obligation, in any fire or other casualty
which creates a Landlord repair obligation in accordance with the terms of this
Section to make available for such reconstruction all or a portion of the amount
by which the cost of repair as certified by Landlord's architect exceeds the
amount of proceeds received by Landlord.


                                       44
<PAGE>   49


7.2  RESERVATION OF AWARD

     Landlord reserves to itself any and all rights to receive awards made for
damages to the Premises or Lot and the leasehold hereby created, or any one or
more of them, accruing by reason of exercise of eminent domain or by reason of
anything lawfully done in pursuance of public or other authority. Tenant hereby
releases and assigns to Landlord all Tenant's rights to such awards, and
covenants to deliver such further assignments and assurances thereof as Landlord
may from time to time request. It is agreed and understood, however, that
Landlord does not reserve to itself, and Tenant does not assign to Landlord, any
damages payable for (i) movable trade fixtures installed by Tenant or anybody
claiming under Tenant, at its own expense, or (ii) relocation expenses
recoverable by Tenant from such authority in a separate action, or (iii) the
value of Tenant's improvements installed in the Premises by or on behalf of
Tenant, but not by Landlord provided, however, if damages payable for (i) and
(ii) above are not awarded by such authority in a separate action, then Tenant
shall only be entitled to recover such damages if such authority expressly
provides that portion of the awards received allocable to (i) and (ii) above AND
if payment to Tenant of such damages does not otherwise reduce or limit
Landlord's award hereunder. Notwithstanding the foregoing, Landlord agrees that
the award from any such taking shall, during the initial Term, be allocated
between Landlord and Tenant as follows: first, to Landlord's mortgagee(s) up to
the amount of the mortgage(s) then, to the Tenant an amount equal to the sum of
the amounts actually paid by Tenant to Landlord for the Tenant's Work installed
hereunder multiplied by a fraction the numerator of which is the number of
months remaining in the initial Term and denominator of which is one hundred and
eighty (180) plus, the total amount of the Tenant's Contribution to Landlord's
Work multiplied by a fraction the numerator of which is the number of months
remaining in the initial Term plus (one hundred twenty (120) months less any
expired months in any Extended Terms) and denominator of which is three hundred
(300); then to Landlord or its mortgagee(s), as their interests may appear, that
certain portion of any remaining award. Notwithstanding any language to the
contrary, any and all of Landlord's obligations to allocate to Tenant any such
portion of the award described in the preceding sentence shall be limited to the
extent such proceeds are actually received by Landlord.

7.3  ADDITIONAL CASUALTY PROVISIONS

     (a)  Landlord shall not be required to repair or replace any of Tenant's
business machinery, equipment, cabinet work, furniture, personal property or
other installations not originally installed by Landlord.

     (b)  In the event of any termination of this Lease pursuant to this Article
VII, the Term of this Lease shall expire as of the effective termination date as
fully and completely as if such date were the date herein originally scheduled
as the Term Expiration Date, and Landlord shall assist Tenant to the extent
necessary to secure Tenant's share of any insurance award relative to the
Tenant's Work hereunder. Tenant shall have access to the Premises at Tenant's
sole risk for a period of thirty (30) days after the date of termination in
order to remove Tenant's personal property except as prohibited by any
applicable governmental agency or official.


                                       45
<PAGE>   50


     (c)  Notwithstanding any language to the contrary contained in this Article
VII, if all or any substantial part of the Premises and/or the Building Parking
Areas or any part thereof (as hereinabove defined), shall be damaged by fire or
other casualty or taken by eminent domain during the last two (2) years of the
Term of this Lease or the last two (2) years of either of the Extended Terms, as
the case may be, then either Landlord or Tenant may terminate this Lease
effective as of the date of such fire or other casualty or taking upon notice to
the other as aforesaid, except that Tenant may render Landlord's notice of
termination nugatory by exercising early its option to extend the initial Term,
or the applicable Extended Term, as the case may be, of this Lease for five (5)
additional years in accordance with Exhibit F. In the event of such early
exercise, Landlord and Tenant agree to determine the Fixed Rent for the
applicable Extended Term at least nine (9) months prior to the commencement date
of the applicable Extended Term in accordance with and in the manner set forth
in said Exhibit F.

                                  ARTICLE VIII
                               RIGHTS OF MORTGAGEE

8.1  PRIORITY OF LEASE

     Landlord shall have the option to subordinate this Lease to any mortgagee
or deed of trust of the Lot or Premises, or both ("the mortgaged premises"),
provided that the holder thereof enters into a Subordination, Non-Disturbance
and Attornment Agreement substantially in the form attached hereto as Exhibit J
(or such other form mutually agreeable to Landlord, Tenant and Landlord's
mortgagee, each party agreeing to reasonably cooperate with each other in
reaching mutual agreement on the content of any such other form).

8.2  LIMITATION ON MORTGAGEE'S LIABILITY

     Upon entry and taking possession of the mortgaged premises for any purpose
other than foreclosure, the holder of a mortgage shall have all rights of
Landlord, and during the period of such possession, the duty to perform all
Landlord's obligations hereunder. Except during such period of possession, no
such holder shall be liable, either as mortgagee or as holder of a collateral
assignment of this Lease, to perform, or be liable in damages for failure to
perform any of the obligations of Landlord unless and until such holder shall
enter and take possession of the mortgaged premises for the purpose of
foreclosing a mortgage. Upon entry for the purpose of foreclosing a mortgage,
such holder shall be liable to perform all of the obligations of Landlord,
subject to the provisions of Section 8.3 provided that a discontinuance of any
foreclosure proceeding shall be deemed a conveyance under the provisions of
Section 10.4 to the owner of the equity of the mortgaged premises. From and
after making entry and taking possession of the Premises, any such mortgagee
shall be fully and completely liable for the obligations hereunder.

8.3  MORTGAGEE'S ELECTION

     Notwithstanding any other provision to the contrary contained in this
Lease, if prior to the substantial completion of Landlord's obligations under
Article III, any holder of a first mortgage on the mortgaged premises enters and
takes possession thereof for the purpose of foreclosing the


                                       46
<PAGE>   51


mortgage, such holder may elect, by written notice given to Tenant and Landlord
at any time within thirty (30) days after such entry and taking of possession,
not to perform Landlord's obligations under Article III, and in such event such
holder and all persons claiming under it shall be relieved of all obligations to
perform, and all liability for failure to perform, said Landlord's obligations
under Article III, and Tenant may terminate this Lease and all its obligations
hereunder by written notice to Landlord and such holder given within thirty (30)
days after the day on which such holder shall have given its notice as
aforesaid.

8.4  NO PREPAYMENT OR MODIFICATION, ETC.

     No Fixed Rent, additional rent, or any other charge shall be paid more than
thirty (30) days prior to the due dates thereof, and payments made in violation
of this provision shall (except to the extent that such payments are actually
received by a mortgagee in possession or in the process of foreclosing its
mortgage) be a nullity as against such mortgagee. No assignment of this Lease
(excepting only in accordance with the provisions of this Lease) and no
agreement to make or accept any surrender, termination or cancellation of this
Lease (excepting only in accordance with the provisions of this Lease) and no
agreement to modify so as to reduce the rent, change the Term, or otherwise
materially change the rights of Landlord under this Lease, or to relieve Tenant
of any obligations or liability under this Lease, shall be valid unless
consented to in writing by Landlord's mortgagees of which Tenant has received
notice.

8.5  NO RELEASE OR TERMINATION

     No act or failure to act on the part of Landlord which would entitle Tenant
under the terms of this Lease, or by law, to be relieved of Tenant's obligations
hereunder or to terminate this Lease, shall result in a release or termination
of such obligations or a termination of this Lease unless (i) Tenant shall have
first given thirty (30) days prior written notice of Landlord's act or failure
to act to Landlord's mortgagees of which Landlord has provided written notice to
Tenant, if any, specifying the act or failure to act on the part of Landlord
which could or would give basis to Tenant's rights, and (ii) such mortgagees,
after receipt of such notice, have failed or refused to correct or cure the
condition complained of within a reasonable time thereafter, but nothing
contained in this Section 8.5 shall be deemed to impose any obligation on any
such mortgagee to correct or cure any such condition. "Reasonable time" as used
above means and includes a reasonable time to obtain possession of the mortgaged
premises, if the mortgagee elects to do so, and a reasonable time to correct or
cure the condition if such condition is determined to exist, however, in no
event shall such time extend beyond one hundred twenty (120) days from the date
Tenant provides notice to Landlord's mortgagee(s) as aforesaid.

8.6  CONTINUING OFFER

     The covenants and agreements contained in this Lease with respect to the
rights, powers and benefits of a mortgagee (particularly, without limitation
thereby, the covenants and agreements contained in this Article VIII) constitute
a continuing offer to any person, corporation or other entity, which by
accepting or requiring an assignment of this Lease or by entry or foreclosure
assumes the obligations herein set forth with respect to such mortgagee, and
such


                                       47
<PAGE>   52


mortgagee shall be entitled to enforce such provisions in its own name. Tenant
agrees on request of Landlord to execute and deliver from time to time any
agreement which may reasonably be deemed necessary to implement the provisions
of this Article VIII.

8.7  SUBMITTAL OF FINANCIAL STATEMENT

     At any time, but not more than annually during the Term of this Lease,
within fifteen (15) days after request therefor by Landlord (i.e. if requested
by Landlord' mortgagee(s)), Tenant shall supply to Landlord and/or any mortgagee
of Landlord a current financial statement, which such financial statement may be
given by Tenant to Landlord in the form of Tenant's current annual report, or
such other financial information as may be reasonably required by any such
party.

                                   ARTICLE IX
                                     DEFAULT

9.1  EVENTS OF DEFAULT BY TENANT

     It shall be an "Event of Default" under this Lease, if (i) Tenant fails to
pay Fixed Rent or additional rent for more than ten (10) days, after notice
thereof specifying such failure and that such failure may be an Event of Default
hereunder; (ii) Tenant fails to perform its other non-monetary obligations
hereunder for more than thirty (30) days after notice thereof from Landlord,
together with such additional time, if any, as is reasonably required to cure
the default if the default is of such a nature that it cannot reasonably be
cured in thirty (30) days; or (iii) if Tenant makes any assignment for the
benefit of creditors, or files a petition under any bankruptcy or insolvency
law; or (iv) if such a petition is filed against Tenant and is not dismissed
within thirty (30) days; or (v) if a receiver becomes entitled to Tenant's
leasehold hereunder and it is not returned to Tenant within ninety (90) days; or
(vi) such leasehold is taken on execution or other process of law in any action
against Tenant; then, and in any such cases, Landlord and the agents and
servants of Landlord may, in addition to and not in derogation of any remedies
for any preceding breach of covenant, immediately or at any time thereafter
while such default continues and without further notice, enter into and upon the
Premises or any part thereof in the name of the whole or mail a notice of
termination addressed to Tenant at the Premises and repossess the same as of
Landlord's former estate and expel Tenant and those claiming through or under
Tenant and remove its and their effects without being deemed guilty of any
manner of trespass and without prejudice to any remedies which might otherwise
be used for arrears of rent or prior breach of covenant, and upon such entry or
mailing as aforesaid, this Lease shall terminate, but Tenant shall remain liable
as hereinafter provided. After the occurrence of an Event of Default as
aforesaid, Tenant hereby waives all statutory rights of redemption, if any to
the extent such rights may be lawfully waived, and Landlord, without notice to
Tenant, may store Tenant's effects and those of any person claiming through or
under Tenant at the expense and risk of Tenant and, if Landlord so elects, may
sell such effects at public auction or private sale and apply the net proceeds
to the payment of all sums due to Landlord from Tenant, if any, and pay over the
balance, if any, to Tenant.


                                       48
<PAGE>   53


9.2  TENANT'S OBLIGATIONS AFTER TERMINATION

     In the event that this Lease is terminated under any of the provisions
contained in Section 9.1, Tenant covenants to pay forthwith to Landlord, as
compensation, a single lump-sum payment equal to the excess of the net present
value of the total rent reserved for the residue of the Term (exclusive of any
unexercised Extended Term(s) remaining at the time of termination) over the fair
market rental value of the Premises (including additional rent) for said residue
of the Term estimated as of the date of termination. If Landlord does not elect
to receive a single lump-sum payment from Tenant as aforesaid, Tenant covenants
and agrees to pay punctually to Landlord all the sums and perform all the
obligations which Tenant covenants in this Lease to pay and to perform in the
same manner and to the same extent and at the same time as if this Lease had not
been terminated. In calculating the amounts to be paid by Tenant under the
foregoing covenants, Tenant shall be credited with any amount paid to Landlord
as compensation as provided in the first sentence of this Section 9.2 and also
with the net proceeds of any rents obtained by Landlord by reletting the
Premises, after deducting all Landlord's expenses in connection with such
reletting, including, without implied limitation, all repossession costs,
brokerage commissions, fees for legal services and expense of preparing the
Premises for such reletting, it being agreed by Tenant that Landlord may (i)
relet the Premises or any part or parts thereof for a term or terms which may,
at Landlord's option, be equal to or less than or exceed the period which would
otherwise have constituted the balance of the Term and may grant such
concessions and free rent as Landlord in its sole judgment considers advisable
or necessary to relet the same, and (ii) make such alterations, repairs and
decorations in the Premises as Landlord in its sole judgment considers advisable
or necessary to relet the same, and no action of Landlord in accordance with the
foregoing on failure to relet or to collect rent under reletting shall operate
or be construed to release or reduce Tenant's liability as aforesaid. If
required by Massachusetts law, and to the extent required by Massachusetts law,
Landlord will use reasonable efforts to mitigate its damages hereunder, except
as hereinafter provided in the next following paragraph.

     So long as at least twelve (12) months of the Term remain unexpired at the
time of such termination, in lieu of any other damages of indemnity and in lieu
of full recovery by Landlord of all sums payable under all the foregoing
provisions of this Section 9.2, Landlord may, by written notice to Tenant, at
any time after this Lease is terminated under any of the provisions contained in
Section 9.1, or is otherwise terminated for breach of any obligation of Tenant
and before such full recovery, elect to recover, and Tenant shall thereupon pay,
as liquidated damages, an amount equal to the aggregate of the Fixed Rent and
additional rent accrued under Article IV in the twelve (12) months ended next
prior to such termination plus the amount of Fixed Rent and additional rent of
any kind accrued and unpaid at the time of termination and less the amount of
any recovery by Landlord under the foregoing provisions of this Section 9.2 up
to the time of payment of such liquidated damages, Tenant agreeing that Landlord
shall have no obligation to use reasonable efforts to mitigate its damages in
the event Landlord so elects to proceed under the provisions of this paragraph.

     Nothing contained in this Lease shall, however, limit or prejudice the
right of Landlord to prove and obtain in proceedings for bankruptcy or
insolvency by reason of the termination of this


                                       49
<PAGE>   54


Lease, an amount equal to the maximum allowed by any statute or rule of law in
effect at the time when, and governing the proceedings in which, the damages are
to be proved, whether or not the amount be greater, equal to, or less than the
amount of the loss or damages referred to above.

                                    ARTICLE X
                                  MISCELLANEOUS

10.1 TITLES

     The titles of the Articles are for convenience and are not to be considered
in construing this Lease.

10.2 NOTICE OF LEASE

     Concurrently with the executing of this Lease, Landlord and Tenant have
executed and recorded (or shall execute and record) a notice of lease in the
form attached hereto as Exhibit T. If this Lease is terminated before the Term
expires the parties will execute an instrument in such form acknowledging the
date of termination.

10.3 NOTICES FROM ONE PARTY TO THE OTHER

     No notice, approval, consent requested or election required or permitted to
be given or made pursuant to this Lease shall be effective unless the same is in
writing. Communications shall be addressed, if to Landlord, at Landlord's
Address with a copy to David Barry Connolly, Esq., Hinckley, Allen & Snyder LLP,
28 State Street, Boston, Massachusetts 02109, or at such other address as may
have been specified by prior notice to Tenant and, if to Tenant, at Tenant's
Address with a copy to Robert Tuchmann, Esq., Hale and Dorr LLP, 60 State
Street, Boston, MA 02109, or at such other place as may have been specified by
prior notice to Landlord. Any communication so addressed shall be deemed duly
served if actually received or delivery is refused at the foregoing addresses
mailed by registered or certified mail, return receipt requested, delivered by
hand, or by overnight express service by a courier providing a receipt of
delivery.

10.4 BIND AND INURE

     The obligations of this Lease shall run with the land, and this Lease shall
be binding upon and inure to the benefit of the parties hereto and their
respective heirs, successors and assigns, except that the Landlord named herein
and each successive owner of the Premises shall be liable only for the
obligations accruing during the period of its ownership, said liability
terminating as to future liability upon termination of such ownership and
passing to the successor in ownership. Neither the Landlord named herein nor any
successive owner of the Premises whether an individual, trust, a corporation or
otherwise shall have any personal liability beyond their equity interest in the
Premises.


                                       50
<PAGE>   55


10.5 NO SURRENDER

     The delivery of keys to any employees of Landlord or to Landlord's agent or
any employee thereof shall not operate as a termination of this Lease or a
surrender of the Premises.

10.6 NO WAIVER, ETC.

     The failure of Landlord or of Tenant to seek redress for violation of, or
to insist upon the strict performance of any covenant or condition of this Lease
or, with respect to such failure of Landlord, any of the Rules and Regulations
or Park Covenants referred to in Section 6.1.4, whether heretofore or hereafter
adopted by Landlord, shall not be deemed a waiver of such violation nor prevent
a subsequent act, which would have originally constituted a violation, from
having all the force and effect of an original violation, nor shall the failure
of Landlord to enforce any of said Rules and Regulations or Park Covenants
against any other tenant in the Park be deemed a waiver of any such Rules or
Regulations or Park Covenants, as applicable. The receipt by Landlord of Fixed
Rent or additional rent with knowledge of the breach of any covenant of this
Lease shall not be deemed a waiver of such breach by Landlord, unless such
waiver be in writing signed by Landlord. No consent or waiver, express or
implied, by Landlord or Tenant to or of any breach of any agreement or duty
shall be construed as a waiver or consent to or of any other breach of the same
agreement or duty in a previous or subsequent instance, or any other agreement
or duty.

10.7 NO ACCORD AND SATISFACTION

     No acceptance by Landlord of a lesser sum than the Fixed Rent and
additional rent then due shall be deemed to be other than on account of the
earliest installment of such rent due, nor shall any endorsement or statement on
any check or any letter accompanying any check or payment as rent be deemed as
accord and satisfaction, and Landlord may accept such check or payment without
prejudice to Landlord's right to recover the balance of such installment or
pursue any other remedy in this Lease provided.

10.8 CUMULATIVE REMEDIES

     The specific remedies to which Landlord may resort under the terms of this
Lease are cumulative and are not intended to be exclusive of any other remedies
or means of redress to which it may be lawfully entitled in case of any breach
or threatened breach by Tenant of any provisions of this Lease. In addition to
the other remedies provided in this Lease, Landlord shall be entitled to the
restraint by injunction of the violation or attempted or threatened violation of
any of the covenants, conditions or provisions of this Lease or to a decree
compelling specific performance of any such covenants, conditions or provisions.


                                       51
<PAGE>   56


10.9 PARTIAL INVALIDITY

     If any term of this Lease, or the application thereof to any person or
circumstances shall to any extent be invalid or unenforceable, the remainder of
this Lease, or the application of such term to persons or circumstances other
than those as to which it is invalid or unenforceable, shall not be affected
thereby, and each term of this Lease shall be valid and enforceable to the
fullest extent permitted by law.

10.10(a)  LANDLORD'S RIGHT TO CURE

     If Tenant shall at any time fail to perform its obligation in accordance
with the provisions of this Lease and Tenant does not commence the cure of such
failure within thirty (30) days of notice thereof (except in the event of
emergencies), and thereafter diligently prosecute such cure to completion, then
Landlord shall have the right, but shall not be obligated, to enter upon the
Premises and to perform such obligation, notwithstanding the fact that no
specific provision for such substituted performance by Landlord is made in this
Lease with respect to such default. In performing such obligation, Landlord may
make any payment of money or perform any other act. All sums so paid by Landlord
(together with interest at the rate set forth in Section 4.3 hereof), and all
necessary incidental reasonable third party costs and expenses in connection
with the performance of any such acts by Landlord, shall be deemed to be
additional rent under this Lease and shall be payable to Landlord immediately on
demand. Landlord may exercise the foregoing rights without waiving any other of
its rights or releasing Tenant from any of its obligations under this Lease.

10.10(b)  TENANT'S RIGHT TO CURE

     If Landlord shall at any time fail to perform any of Landlord's obligations
in accordance with the provisions of this Lease relating to the Premises and
Tenant has provided Landlord and any mortgagee on the Property of which Tenant
has been give notice, with thirty (30) days written notice to cure such default
and Landlord or Landlord's mortgagee does not commence the cure of such failure
as soon as reasonably practicable and thereafter diligently prosecute such cure
to completion, then Tenant shall have the right, but not the obligation, to cure
any such default for the account of Landlord. If Tenant shall undertake such
performance, Landlord shall reimburse Tenant for all costs and expenses
reasonably incurred by Tenant in connection with such performance within thirty
(30) days after receipt of an invoice therefor from Tenant (together with any
such back up documentation reasonably requested by Landlord). If Landlord fails
to reimburse Tenant within said thirty (30) day period, then Tenant shall be
entitled to offset the unreimbursed costs against fifteen percent (15%) of the
monthly Fixed Rent due hereunder until such costs due to Tenant hereunder have
been reimbursed in full.

10.11 ESTOPPEL CERTIFICATE

     Tenant agrees on the Commencement Date, and from time to time thereafter,
upon not less than thirty (30) days' prior written request by Landlord, to
execute, acknowledge and deliver


                                       52
<PAGE>   57


to Landlord a statement in writing in substantially the form attached hereto as
Exhibit G, certifying if true (and where not true, indicating where not true),
as follows: that this Lease is unmodified and in full force and effect; that
except as set forth in this Lease, Tenant has no defenses, offsets or
counterclaims against its obligations to pay the Fixed Rent and additional rent
and to perform its other covenants under this Lease; that there are no uncured
defaults of Landlord or Tenant under this Lease (or, if there are any defenses,
offsets, counterclaims, or defaults, setting them forth in reasonable detail);
and the dates to which the Fixed Rent, additional rent and other charges have
been paid. Any such statements delivered pursuant to this Section 10.11 may be
relied upon by any prospective purchaser or mortgage of premises which include
the Premises or any prospective assignee of any such mortgagee.

10.12 WAIVER OF SUBROGATION

     Landlord and Tenant mutually agree, with respect to any hazard which is
covered by casualty or property insurance then being carried by them, or
required to be carried hereunder (whether or not such insurance is then in
effect) to release each other from any and all claims with respect to such loss;
and they further mutually agree that their respective insurance companies shall
have no right of subrogation against the other on account thereof. If extra
premium is payable by either party as a result of this provision, the other
party shall reimburse the party paying such premium the amount of such extra
premium. The parties further agree that if said waiver of subrogation shall be
unobtainable or unenforceable or shall void the respective policies, then their
respective insurance policies shall not be invalidated, and said waiver shall
become null and void and of no further force and effect.

10.13 BROKERAGE

     Tenant represents and warrants to Landlord, and Landlord represents and
warrants to Tenant, that it has dealt with no broker, other than such broker(s)
listed in Section 1.1, in connection with this transaction and agrees to defend,
indemnify and save the other party harmless from and against any and all claims
for a commission arising out of this Lease made by anyone, other than such
broker(s) in Section 1.1. Landlord shall be responsible for payment of all fees
and commissions payable to such broker(s) in accordance with the terms of those
certain Agreements dated November 14, 2000 and October 31, 1997 and executed by
and between Landlord, Meredith & Grew and Grubb & Ellis.

10.14 ACCESS AND SECURITY SYSTEM

     Subject to the terms and provisions of this Lease, Tenant shall have
twenty-four (24) hours, seven (7) days per week, access to the Premises. If
desired, Tenant shall be responsible for providing its own security system and
card access system within the Premises as part of the Tenant's Work.


                                       53
<PAGE>   58


10.15 ENTIRE AGREEMENT

     This instrument contains the entire and only agreement between the parties
as to the Premises, and no oral statements or representations or prior written
matter not contained in this instrument shall have any force or effect. This
Lease shall not be modified in any way except by a writing subscribed by both
parties.

10.16 GOVERNING LAW

     This Lease shall be governed by and construed and enforced in accordance
with the laws and courts of the Commonwealth of Massachusetts.

10.17 ADDITIONAL REPRESENTATIONS

     Landlord represents and warrants to Tenant as follows:

     (a)  that Landlord has the right and authority to enter into this Lease and
grant Tenant possession of the Premises and other rights set forth herein;

     (b)  that Landlord is the fee simple owner of the Lot and that Landlord (or
its affiliate(s) or an affiliate(s) of The Gutierrez Company) are the fee simple
owners of the Park;

     (c)  that the Premises, the Building (including all common areas,
entrances, restrooms, elevators, water fountains and signage), the Building
Parking Area and the Lot will, upon Substantial Completion and issuance of all
necessary permits and approvals required to be obtained from any and all
necessary governmental agencies prior to occupancy of the Premises by Tenant,
including without limitation, a certificate of occupancy from the Town of
Bedford, Massachusetts which allows Tenant to use and occupy the Premises as
specified in Article III hereof, comply with all dimensional, use, parking,
loading and other zoning requirements of the Town of Bedford, Massachusetts, and
all applicable building codes and governmental requirements, including without
limitation the regulations of the Americans with Disabilities Act of 1990 (ADA);
and

     (d)  that, upon Substantial Completion, the Building's structural
components and Building systems shall be in good working order.

10.18 PARKING

     Tenant's occupancy of the Premises shall initially include the use of 302
parking spaces to be expanded to 389 parking spaces when permitted by lifting of
the MEPA Limitation (as hereinafter defined) allowing for the construction and
use of additional parking, which Landlord shall diligently pursue. Tenant's
parking spaces, specifically including sufficient paved area to accommodate up
to 389 spaces, (which shall include visitor spaces in front of the Building)
shall be known and referred to in this Lease as the "Building Parking Area," and
shall be shown as


                                       54
<PAGE>   59


such on the Landlord's Plans. As set forth in Section 2.1 hereof, the Building
Parking Area shall be used by Tenant in common with other tenants of the Park.
Upon Tenant giving Landlord at least sixty (60) days prior written notice,
Landlord agrees to provide traffic control personnel at peak hours to enforce
Tenant's rights to exclusively park in the Building Parking Area, the costs
thereof shall be reimbursable to Landlord pursuant to Sections 4.2 and 5.1.2
hereof.

10.19 RIGHT OF FIRST OFFER

     Landlord hereby grants to Tenant but specifically not to any subtenant or
any assignee (that is not a Permitted Transferee) the following right with
regard to the Premises or any portion thereof so long as in any case (i) there
does not then exist an Event of Default under this Lease, (ii) this Lease is in
full force and effect, and (iii) Tenant is then leasing at least seventy-five
percent (75%) of the Premises. In the event Landlord shall decide to offer for
sale the Premises, or any portion thereof, Landlord shall forthwith give notice
to Tenant of its intention to sell the same at Landlord's specified price
("Landlord's Price"). Tenant shall have the right, for a period of fifteen (15)
calendar days, or in the last year of the Term or of any Extended Term for a
period of ten (10) calendar days, after such notice of intention to sell, to
notify Landlord of Tenant's interest in purchasing the same at Landlord's Price.
If (i) Tenant so notifies Landlord in writing, and (ii) Landlord and Tenant
agree on terms and conditions of purchase and sale within fifteen (15) calendar
days of such Tenant notification, or in the last year of the Term or of any
Extended Term within ten (10) calendar days of such Tenant notification, Tenant
shall post with Landlord a ten percent (10%) deposit and the Premises, or such
portion thereof, shall be sold by Landlord to Tenant, in the same condition as
at the time of the posting of the deposit, within sixty (60) days of Tenant's
acceptance at that price and upon those terms and conditions. If Tenant does not
accept Landlord's Price, Tenant may within a period of fifteen (15) calendar
days, or in the last year of the Term or of any Extended Term ten (10) calendar
days, after such notice of Landlord's intention to sell, specify a price to
Landlord (the "Tenant's Price"). If (i) Tenant so notifies Landlord, and (ii)
Landlord and Tenant agree on the Tenant's Price and terms and conditions of
purchase and sale within fifteen (15) calendar days of said Tenant notification,
or in the last year of the Term or of any Extended Term within ten (10) calendar
days of said Tenant notification, Tenant shall post with Landlord a ten percent
(10%) deposit and the Premises, or such portion thereof, shall be sold by
Landlord to Tenant, in the same condition as at the time of the posting of the
deposit, within sixty (60) calendar days of such Tenant's offer at the Tenant's
Price. Provided, however, that if Tenant thereafter defaults in its obligations
to Landlord under this subsection, Landlord shall retain as liquidated damages
the Tenant's deposit and all interest earned thereon, and Tenant shall pay to
Landlord as additional rent hereunder the costs and expenses reasonably incurred
by Landlord in connection with the proposed sale to Tenant under this
subsection, and all of Tenant's rights under this Section 10.19 and the rights
and options referenced in the sideletters referred to in Section 10.20 herein
and in Exhibits Q and R attached hereto shall thereafter be null and void and of
no further force and effect. If Tenant does not exercise its option of first
offer, or if Landlord and Tenant do not agree on a purchase price and/or terms
and conditions of purchase and sale, then Landlord shall promptly after the end
of such fifteen (15) calendar day period, or in the last year of the Term or of
any Extended Term within such ten (10) calendar day period, for negotiation of
terms and conditions of either the Landlord's Price or Tenant's Price, as the
case may be, notify Tenant of Landlord's Adjusted


                                       55
<PAGE>   60


Price, which may be the same as Landlord's Price (but not less than the lowest
price for the Premises at which Landlord has offered to sell the Premises to
Tenant within the applicable negotiation period), and Landlord shall be free for
a period of two hundred ten (210) days thereafter to enter into a purchase and
sale agreement for the sale of the Premises, or such portion thereof, and/or to
sell the Premises, or such portion thereof, subject to this Lease, to any third
party for a price equal to or greater than the Landlord's Adjusted Price with
closing to take place within a reasonable period of time thereafter. After such
two hundred ten (210) day period, unless the Lease is sooner terminated, thus
extinguishing this Right of First Offer, such Right of First Offer will be
reinstated. (Upon reinstatement of such Right of First Offer, if Landlord still
wishes to sell the Premises or any portion thereof, it shall re-offer for sale
the Premises, or any portion thereof, to Tenant at any Landlord's Price which
Landlord may in its sole discretion then determine, and Tenant's rights may be
exercised as previously set forth in this Section 10.19, except that Tenant's
period of notification to Landlord of its interest in purchasing (i) at
Landlord's Price, or (ii) to specify an alternate Tenant's Price shall be five
(5) calendar days). Landlord and Tenant shall use good faith efforts to
negotiate the terms of the purchase and sale agreement and the purchase price.

     If Tenant exercises its option of first offer pursuant to this Section
10.19, the purchase price shall be paid by certified check or checks drawn by a
Boston bank or banks on the Federal Reserve Bank of Boston or in such other
manner as will make the consideration available in Boston to Landlord for
investment on the Closing Date, and the Premises in the same condition as at the
time the Deposit was made shall be simultaneously conveyed on the Closing Date
by a good and sufficient quitclaim deed running to Tenant delivered at the
offices of Hinckley, Allen, & Snyder LLP, 28 State Street, Boston, Massachusetts
02109, or such other location in the metropolitan Boston area selected by
Tenant, conveying a good and clear record and marketable title thereto subject
only to, and with the benefit of, the following matters affecting the Premises
on the closing date (the "Permitted Encumbrances"):

     l.   Rights, easements, covenants, agreements and restrictions specifically
including but not limited to parking rights and easements, covenants and
restrictions necessary or convenient for the development, construction and use
of additional office buildings within the Park and rights, easements, covenants,
agreements and restrictions affecting the Premises on the Term Commencement
Date, but the same shall not include any leasehold interests therein except for
this Lease and any other leases for occupancy of space within the Building.

     2.   Rights, easements, restrictions, covenants and agreements hereafter
affecting the Premises so far as in force and applicable on the closing date,
which do not secure or create a voluntary lien for the payment of money.

     3.   Real estate taxes and municipal betterments not yet due and payable
assessed or to be assessed upon the Premises.

     4.   Balances, if any, remaining due and unpaid on account of betterment
assessments on the Premises.


                                       56
<PAGE>   61


     5.   Laws and regulations of any government authority.

     6.   Any changes in the Premises which may have occurred as a result of,
and any easements or restrictions imposed by, takings by eminent domain.

     Closing adjustments of the usual and customary items shall be made between
the parties taking into account the provisions of this Lease if applicable and
the respective obligations of the parties with respect to the payment of such
items.

     If the Landlord shall be unable to give title or to make conveyance, or to
deliver possession, all as herein stipulated, or if at the time for delivery of
the deed the Premises does not conform with the provisions hereof, the Landlord
shall use commercially reasonable efforts to remove any defects in title, or to
deliver possession as provided herein, or to make the said Premises conform to
the provisions hereof, as the case may be, and thereupon the time for
performance hereof shall be extended for a period of 60 days. To enable the
Landlord to make conveyance as herein provided, the Landlord shall, at the time
of delivery of the deed, use up to a maximum of one hundred thousand dollars
($100,000.00) of the purchase money or any portion thereof to clear the title of
any or all encumbrances or interests, provided that all instruments so procured
are recorded simultaneously with the delivery of said deed or arrangements are
made reasonably satisfactory to Tenant and its counsel to procure the same
within a reasonable period of time after the closing.

     In regard to mortgages to which the Premises is subject immediately prior
to the purchase, there shall be paid directly by official bank or certified
check to the holder of such mortgage, for the purpose of discharging the same,
such portion of the purchase price as is necessary to pay all amounts (including
without limitation any prepayment penalties) secured by such mortgage relating
to the Premises, and the remaining balance of the purchase price shall be paid
to Landlord. Tenant shall have the right, at Tenant's option, and with the
consent of any applicable mortgagee, to assume any mortgages thereon, in which
event the purchase price shall be reduced by the outstanding balance of
principal, interest and other charges under such mortgages as of the closing
date provided, however, that Tenant may assume said mortgage only if the
mortgagee simultaneously releases Landlord, its Affiliates or any other parties
liable therefor from any further obligation on the mortgage debt.

     Tenant agrees, at Landlord's request, to allow Landlord to attempt to
effectuate a tax free exchange at Landlord's sole risk in connection with the
exercise by Tenant of its first offer right contained in this Lease, provided,
however, that Landlord pays all of Tenant's reasonable costs in connection with
such tax free exchange. Tenant shall cooperate with Landlord in connection
therewith provided that the same does not result in substantial delays in
completing the purchase and Tenant in its sole reasonable opinion bears no
additional liability as a result thereof.

     10.19.1   AFFILIATES. The foregoing rights of Tenant set forth in Section
10.19 shall not be applicable to (i) transfers and sales to Affiliates of
Landlord or Affiliates of The Gutierrez Company, (ii) transfers or sales to any
party of any limited partnership interest in the limited partnership which
transferee is Landlord or the affiliates of the General Partner, family


                                       57
<PAGE>   62


members or affiliates of the General Partner or of any limited partner, or
employees of the General Partner(s) or limited partners, (iii) transfers, or
sales of any general partnership interest in the limited partnership which is
Landlord to an Affiliate, (iv) the placing of any bona fide mortgage on the
Premises or any portion thereof or to the foreclosure thereof or to the delivery
of a deed or any other transfer in lieu of such foreclosure, or (v) any sale and
leaseback transaction, (vi) any exercise of an option to acquire an ownership
interest in the Premises pursuant to any equity or convertible mortgage, and
(vii) to any partial sale of an undivided interest or any joint venture
transaction in lieu of conventional refinancing of the Building.

     This Right of First Offer shall be extinguished by any foreclosure or deed
in lieu of foreclosure given to any mortgagee of the Premises or any part
thereof. The Right of First Offer shall not be binding on any mortgagee of the
Premises or any part thereof or any party obtaining title to the Premises or any
part thereof from such mortgagee, provided however, that Landlord shall give
notice to Tenant (i) ten (10) days before the grant by Landlord of any deed in
lieu of such foreclosure, and (ii) forthwith (which notice may be given by
mortgagee as well as Landlord) of the institution of any foreclosure under any
mortgage of the Premises. Any other such transfer or sale shall be subject to
this Right of First Offer.

     As used herein an Affiliate shall mean as to any Landlord (i) Arturo J.
Gutierrez, John A. Cataldo, or members of their immediate family (as defined
below); (ii) the legal representative, successor or assignee of, or any trustee
of a trust for the benefit of Arturo J. Gutierrez, John A. Cataldo, or members
of their immediate family; or (iii) any entity of which a majority of the voting
interests is owned by any one or more of the persons referred to in the
preceding clauses (i) and (ii). Immediate family shall mean, with respect to any
person, his spouse, children, adopted children, parents, parents-in-law,
grandchildren and great-grandchildren.


                                       58
<PAGE>   63


     IN WITNESS WHEREOF, the parties hereto have duly executed this Lease as of
this ___ day of November, 2000.

                                        LANDLORD:
                                        BEDFORD WOODS LIMITED
                                        PARTNERSHIP I
                                        BY: THE GUTIERREZ COMPANY,
                                        GENERAL PARTNER


                                        By: /s/ Arturo J. Gutierrez
                                            ------------------------------------
                                            Its: President
                                            Dated: November 17, 2000

                                        TENANT:
                                        RSA SECURITY, INC.


                                        By: /s/ John F. Kennedy
                                            ------------------------------------
                                            Its: Chief Financial Officer
                                            Dated: November 17, 2000


                                       59
<PAGE>   64


                                   EXHIBIT "A"

               PLANS SHOWING TENANT'S SPACE, THE LOT AND THE PARK

     Plans entitled "C1.1, C2.1, C2.2, C3.1, C3.2, C4.1, C4.2, C5.1, C5.2, C6.1,
C6.2, C6.3, C6.4 Revised Notice of Intent The Gutierrez Company, Building 4,
Bedford Woods, Bedford, MA dated September 29, 1999 revised November 16, 1999
and revised November 8, 2000 and November 10, 2000" by Symmes, Maini & McKee
Associates; Park plan entitled "Bedford Woods, Middlesex Turnpike, Bedford, MA,
Lot Plan by Symmes, Maini & McKee Associates dated November 10, 2000; and
Proposed subdivision plan entitled "Plan of Land in Bedford, MA, Prepared for
the Gutierrez Company, dated November 13, 2000" by Hancock Survey Associates,
Inc.


<PAGE>   65


                                  EXHIBIT "A-1"

                          LEGAL DESCRIPTION OF THE LOT


     A certain parcel of land located on Middlesex Turnpike in the Bedford Woods
Office Park, Bedford, Massachusetts shown as Lot 1-4 on that certain plan
entitled "Plan of Land in Bedford, MA prepared for The Gutierrez Company"
prepared by Hancock Survey Associates, Inc. Scale 1" = 100' dated November 13,
2000 and to be recorded with the Middlesex South Registry of Deeds when executed
by the Town of Bedford, Massachusetts Planning Board. Said Lot 1-4 contains
approximately 25.58 acres according to said plan (a copy of which is attached
hereto and made a part hereof). Landlord and Tenant hereby acknowledge and agree
that this Exhibit A-1 shall be replaced by amendment to this Lease upon creation
of the Lot and recording of said plan.


<PAGE>   66


                                  EXHIBIT "B-1"

                               BASE BUILDING PLANS

     Attached hereto are plans entitled "Building 4, Bedford Woods, Bedford, MA,
Tenant Review A1.1, A1.2, A1.3, A1.4, A2.1, A3.1" dated November 13, 2000
prepared by Symmes, Maini & McKee Associates.


<PAGE>   67


                                  EXHIBIT "B-2"


                        GUTIERREZ CONSTRUCTION CO., INC.

                             OUTLINE SPECIFICATIONS
                                       FOR
                                  BEDFORD WOODS
                                   BUILDING #4
                             BEDFORD, MASSACHUSETTS
                                NOVEMBER 14, 2000


<PAGE>   68


                             OUTLINE SPECIFICATIONS

                                      INDEX


<TABLE>
<CAPTION>
                                                                                          PAGE NO.
                                                                                          --------
<S>                                                                                       <C>
DIVISION 1 - GENERAL REQUIREMENTS                                                            3
---------------------------------
             Section 1A - Scope of the Work
             Section 1B - Assumptions
             Section 1C - Area Summary

DIVISION 2 - SITE WORK                                                                       4
----------------------
             Section 2A - Site Preparation and Earthwork
             Section 2B - Site Improvements
             Section 2C - Lawns and Plantings
             Section 2D - Site Drainage
             Section 2E - Site Utilities
             Section 2F - Irrigation

DIVISION 3 - CONCRETE                                                                        6
---------------------
             Section 3A - Concrete
             Section 3B - Precast Concrete

DIVISION 5 - METALS                                                                          7
-------------------
             Section 5A - Structural Steel
             Section 5B - Miscellaneous and Ornamental Iron

DIVISION 6 - CARPENTRY                                                                       8
----------------------
             Section 6A - Rough Carpentry
             Section 6B - Millwork

DIVISION 7 - MOISTURE PROTECTION                                                             9
--------------------------------
             Section 7A - Roofing and Flashing
             Section 7B - Waterproofing, Dampproofing and Caulking

DIVISION 8 - DOORS, WINDOWS AND GLASS                                                       10
-------------------------------------
             Section 8A - Wood Doors
             Section 8B - Metal Door Frames
             Section 8C - Finish Hardware
             Section 8D - Aluminum Entrance
             Section 8E - Glass and Glazing
             Section 8F - Overhead Doors
</TABLE>


                                       1
<PAGE>   69


Outline Specifications - Index

<TABLE>
<S>                                                                                        <C>
DIVISION 9 - FINISHES                                                                       12
---------------------
             Section 9A - Resilient Base
             Section 9B - Acoustical
             Section 9C - Painting and Vinyl Wallcovering
             Section 9D - Gypsum Drywall
             Section 9E - Exterior Soffits
             Section 9F - Insulation
             Section 9G - Carpeting
             Section 9H - Ceramic Tile

DIVISION 10 - SPECIALTIES                                                                   14
-------------------------
             Section 10A - Toilet Partitions
             Section 10B - Toilet Accessories
             Section 10C - Dock Equipment

DIVISION 12 - FURNISHINGS                                                                   15
-------------------------
             Section 12A - Blinds

DIVISION 14 - CONVEYING SYSTEM                                                              16
------------------------------
             Section 14A - Elevator

DIVISION 15 - MECHANICAL                                                                    17
------------------------
             Section 15A - Plumbing
             Section 15B - Heating, Ventilating and Air Conditioning
             Section 15C - Sprinklers

DIVISION 16 - ELECTRICAL                                                                    20
------------------------
             Section 16A - Electrical Work

DIVISION 17 - EXCLUSIONS                                                                    23
------------------------
</TABLE>


                                       2
<PAGE>   70


                                   DIVISION 1

                              GENERAL REQUIREMENTS


SECTION 1A - SCOPE OF THE WORK

1A-01     Gutierrez Construction Co., Inc. will provide all labor, material and
          equipment necessary to complete the construction of the subject
          building in accordance with these Outline Specifications dated May 19,
          2000, the preliminary drawings as prepared by Symmes, Maini & McKee
          Associates, Inc. dated November 13, 2000, and the Site Plan of Land
          dated February 4, 1999, revised through November 16, 1999 and November
          8, 2000, as prepared by Symmes, Maini & McKee Associates, Inc.


SECTION 1B - ASSUMPTIONS

1B-01     All required utilities of adequate size and capacity will be available
          at the property line or in the Subdivision Road immediately adjacent
          to the property line.

1B-02     This proposal is based on Class II-C construction as specified in the
          Massachusetts State Building Code.


SECTION 1C - AREA SUMMARY

1C-01     The building is a three (3) story, "open shell" office building for a
          total of 140,012 square feet.

1C-02     Parking spaces to be provided at 3.18 spaces per 1,000 square feet of
          building area.

1C-03     Provide two (2) truck docks and a dumpster pad.


                                       3
<PAGE>   71


                                   DIVISION 2

                                    SITE WORK


SECTION 2A - SITE PREPARATION AND EARTH WORK

2A-01     The building site, including landscaped areas, shall be graded to
          +0.1' elevations with positive drainage, free of pockets, using
          existing granular materials. All grading is to be done in accordance
          with the site plan developed from the preliminary drawings adjusted so
          as to produce a balanced site.

2A-02     The building pad shall be graded and compacted with six inches (6") of
          suitable granular material to an elevation of minus five inches (-5")
          from finished floor elevation. Compaction shall be 95% proctor method,
          ASTM D 1557.

2A-03     All paved areas shall receive a minimum of eight inches (8") of
          suitable granular material compacted to 92% of its maximum density.


SECTION 2B - SITE IMPROVEMENTS

2B-01     Parking areas shall be paved with two and one half inches (2 1/2") of
          bituminous concrete to consist of one and one-half inches (1 1/2")
          binder coarse and one inch (1") finish. Material and workmanship shall
          be based on State Highway Department specifications.

2B-02     Roads shall be paved as specified for parking areas.

2B-03     Sidewalks shall be paved with four inches (4") of concrete around the
          building and 2 1/2" bituminous paving at parking lots.

2B-04     All necessary curbing shall be granite or bituminous berm as shown on
          the drawings.


SECTION 2C - LAWNS AND PLANTINGS

2C-01     Lawns and planting will be designed to meet the Town Planning Board's
          requirements per Symmes, Maini & McKee Associates, Inc.'s Site Plans.


SECTION 2D - SITE DRAINAGE

2D-01     Parking areas, roadways and trucking areas shall be surface drained
          and underground drainage shall be installed as required.


                                       4
<PAGE>   72


                       DIVISION 2 - SITE WORK (Continued)


SECTION 2E - SITE UTILITIES

2E-01     Domestic water service and fire sprinkler shall be from a water main
          at the property line. The water meter and piping shall be sized to
          suit the building requirements. Fire sprinkler service will be sized
          per NFPA 13 for light hazard.

2E-02     Sanitary sewer shall be connected to the existing sewer main at the
          property line.

2E-03     Electrical service shall be provided by the electric UTILITY COMPANY'S
          pad-mounted transformer.

2E-04     Provide six (6) 4" PVC Conduits for telephone/fiber optics service
          entrance.

2E-05     Gas service will be provided by the local utility company.

2E-06     Provide two (2) 4" PC Conduits between Building #3 and Building #2 for
          Tenant's use.


SECTION 2F - IRRIGATION

2F-01     An automatic, underground lawn irrigation system will be provided for
          all lawn areas adjacent to the building and at the main entrance.


                                       5
<PAGE>   73


                                   DIVISION 3

                                    CONCRETE


SECTION 3A - CONCRETE

3A-01     Provide all plain and reinforced concrete work, including all
          necessary form work, sleeves, inserts, etc. Concrete material shall be
          3,000 p.s.i.

3A-02     Floor slab-on-grade shall be five inch (5") thick concrete reinforced
          with welded wire fabric for a live load rating of 200 p.s.f. Second
          and third floor slabs shall be designed for a load of 100 p.s.f. with
          live load reduction allowed by the Massachusetts State Code.

3A-03     Foundations shall be continuous reinforced concrete footings and walls
          and individual spread reinforced concrete footings under columns. All
          foundations shall bear on engineered fill, natural soil or ledge.

3A-04     Floors shall meet the following level and flatness criteria. Slab on
          grade shall be within FF (flatness) 25 and F1 (level) 20. Suspended
          slabs shall be within FF (flatness) = 20.


SECTION 3B - PRECAST CONCRETE

3B-01     Precast concrete exterior spandrel panels shall be designed to meet
          wind loading as required by the governing code(s) and shall have an
          exposed aggregate finish as approved by the Architect and Owner.


                                       6
<PAGE>   74


                                   DIVISION 5

                                     METALS


SECTION 5A - STRUCTURAL STEEL

5A-01     All structural steel work shall conform to the "Specifications for
          Design, Fabrication and Erection of Structural Steel for Buildings" of
          the American Institute of Steel Construction and the requirements of
          the local building code. All steel shall be ASTM-A-36.

5A-02     The structure shall be steel columns, beams or trusses, and bar
          joists. The building shall be designed in accordance with the building
          code requirements.

5A-03     The roof construction shall be 22 gauge, prime-painted metal roof
          decking. Roof shall be designed to support a live load of 35 p.s.f.
          plus the loading required for a rubber or EPDM ballasted roofing
          system.

5A-04     Second and third floor framing systems shall be designed to support a
          total live and dead load of 100 p.s.f. with live load reduction
          allowed by the Massachusetts State Code. Floor decking shall be 28
          gauge Fab-Form metal deck or equal.

5A-05     Provide thirteen feet (13'-0"') from first floor slab to second floor
          slab. Provide thirteen feet (13'-0") from second floor slab to the
          third floor slab. Provide thirteen feet six inches (13'-6") from third
          floor slab to the top of the roof steel at the high point.

5A-06     Provide wind framing and attachment for precast concrete.

5A-07     Provide framing and supports for roof top equipment as may be
          required.


SECTION 5B - MISCELLANEOUS AND ORNAMENTAL IRON

5B-01     Provide manhole and catch basin frames and covers where required.

5B-02     Stairs shall be metal pan, concrete filled type. Stairs shall be
          provided with integral nosings. Handrails shall be tubular steel,
          except as otherwise indicated on the drawings. One stair will service
          the roof.

5B-03     All necessary channel iron supports and hanging rods for toilet
          partitions and glass entrances shall be provided.

5B-04     Provide elevator sill angles.

5B-05     Provide one ornamental stair from the first to the second floor at the
          Atrium. Alternately, the Tenant may elect to take a cash allowance.


                                       7
<PAGE>   75


                                   DIVISION 6

                                    CARPENTRY


SECTION 6A - ROUGH CARPENTRY

6A-01     Provide all wood blocking and rough carpentry required.

6A-02     Install wood doors, metal door frames and finish hardware.

6A-03     Install toilet partitions.


SECTION 6B - MILLWORK

6B-01     All men's and women's toilet rooms shall have Corian lavatory counter
          tops with integral bowls, backsplash, endsplash and apron.

6B-03     Provide a four inch (4") oak base at the walls of the lobbies and
          toilet room vestibule areas, or alternate type base as selected.
          Alternately, the Tenant may elect to take a cash allowance.

6B-04     Provide a plastic laminate sill at all perimeter wall office windows.

6B-05     Provide a plastic laminate backsplash at the mop sink in the janitor's
          closet.


                                       8
<PAGE>   76


                                   DIVISION 7

                               MOISTURE PROTECTION


SECTION 7A - ROOFING AND FLASHING

7A-01     The roof shall be insulated to yield a "U" factor of .06. Roof loading
          is to be in accordance with the building code requirements. The
          roofing shall be a ballasted rubber or EDPM roofing system as
          manufactured by Carlysle, Firestone, General Tile or approved equal. A
          ten (10) year labor and material and an additional ten (10) years on
          material, manufacturer's standard guarantee is included.

7A-02     Flashing at the precast concrete parapets and HVAC equipment shall be
          provided.

7A-03     Vent pipe flashings shall be provided as necessary.


SECTION 7B - WATERPROOFING, DAMPPROOFING AND CAULKING

7B-01     Interior caulking shall be the type appropriate for the application.

7B-02     Caulk perimeter of all exterior doors and windows with monolastic,
          meric Thiokol caulking or approved equal.

7B-03     All precast concrete joints shall be caulked with monolastomeric
          Thiokol caulking or approved equal.

7B-04     Waterproof and/or dampproof the elevator pit as required.


                                       9
<PAGE>   77


                                   DIVISION 8
                            DOORS, WINDOWS AND GLASS

SECTION 8A - WOOD DOORS

8A-01     Interior base building wood doors shall be 3'0" x 8'-0" by 1 3/4"
          solid core, plain sliced, red oak and/or 3'0" x 7'0" by 1 3/4" solid
          core, stain grade oak. Provide fire rated doors as required by code.
          All oak doors are to have matching edges.

SECTION 8B - METAL DOORS AND FRAMES

8B-01     All interior base building door frames shall be welded type or three
          piece, pressed metal, single and/or double rabbet door frames with
          proper anchors for partitions. Provide fire rated frames as required
          by code.

8B-02     Provide a 3'-0" x 7'-0" metal insulated door adjacent to loading dock.

SECTION 8C - FINISH HARDWARE

8C-01     Finish hardware shall be heavy duty grade Russwin, Schlage, or
          approved equal.

8C-02     Key schedule shall be per the Owner's requirements.

8C-03     Lockset to have removable cores.


SECTION 8D - ALUMINUM ENTRANCE

8D-01     Aluminum door frame assemblies, including window trim, shall be
          anodized aluminum as indicated on the drawings.

8D-02     Aluminum entrances shall be complete with all hardware (pivot hinges,
          push/pulls, closers, etc.) except cylinder, which is to be furnished
          under Section 8C, Finish Hardware.


SECTION 8E - GLASS AND GLAZING

8E-01     Glass for entrances shall be 1/4" tinted. Entrance doors shall be 3'0"
          x 7'0" with glass transom.

8E-02     Mirrors shall be provided over each lavatory at the men's and women's
          toilet rooms. In addition, women's toilet rooms shall be provided with
          a full height mirror located on the wall opposite the lavatories.

8E-03     The exterior glass shall be 1" insulating, butt glazed, tinted as
          manufactured by LOF, PPG or approved equal. Glass area shall be kept
          under 50% of the exterior wall area. Includes Manufacturer's Standard
          ten (10) year warranty for the insulated glass units.


                                       10
<PAGE>   78


                DIVISION 8 - DOORS, WINDOWS AND GLASS (Continued)


SECTION 8E - GLASS AND GLAZING (Continued)

8E-04     The aluminum framing for glass shall be anodized aluminum with a
          thermal break as manufactured by Alumiline, Kawneer or approved equal.
          All windows are to be the fixed type.


SECTION 8F - OVERHEAD DOORS

8F-01     Provide two (2) electrically operated, 8' x 8', insulated overhead
          door with weather seal for the truck dock.


                                       11
<PAGE>   79


                                   DIVISION 9

                                    FINISHES


SECTION 9A - RESILIENT BASE FOR THE BASE BUILDING

9A-01     Resilient base shall be 4" high, vinyl cove or straight as applicable.
          Alternately, the Tenant may elect to take a cash allowance.

SECTION 9B - ACOUSTICAL WORK FOR THE BASE BUILDING

9B-01     All base building toilet rooms, stairways and main lobby shall have
          lay-in, reveal edge units of 3/4" x 24" x 24", mineral acoustic tile.
          Suspension system shall be exposed grid "T" suspension system. Ceiling
          height shall be 8'-6", except toilet rooms shall be 7'6". Tile and
          suspension system shall be white. Alternately, the Tenant may elect to
          take a cash allowance.


SECTION 9C - PAINTING FOR THE BASE BUILDING

9C-01     All exposed ferrous metals shall receive a primer coat and one coat of
          enamel.

9C-02     Interior painted walls are to receive two coats of latex paint. The
          lobby will be painted with Zolatone, polymix or approved equal.

9C-03     Interior, base building doors shall receive two coats of semi-gloss
          enamel paint, or one coat of sealer and two coats of polyurethane.

9C-04     Toilet room walls that are not to receive ceramic tile shall be
          painted with Zolatone, polymix or approved equal, or shall receive
          vinyl wall covering at the contractor's option.


SECTION 9D - GYPSUM DRYWALL FOR THE BASE BUILDING

9D-01     Interior, ceiling high partitions shall be 25 ga., 2 1/2" galvanized
          metal studs, 24" O.C. with _" gypsum wallboard on each side, taped,
          sanded and ready for paint. All full-height partitions shall be 25
          ga., 3 5/8" galvanized metal studs, 24" O.C. with _" gypsum wallboard
          on each side, taped, sanded and ready for paint. Insulation in
          partitions shall be as indicated on the drawings. Provide fire rating
          as required by code. All required fire rated walls shall be
          constructed with approved fire rated drywall assembly systems.

9D-02     The interior of the exterior walls shall be furred with metal studs,
          insulated and covered with drywall in all finished areas. The interior
          face of all precast concrete will be insulated with a minimum of 3
          1/2" of fiberglass insulation.


                                       12
<PAGE>   80


                        DIVISION 9 - FINISHES (Continued)


SECTION 9D - GYPSUM DRYWALL FOR THE BASE BUILDING  (Continued)

9D-03     Interior steel columns will be tubular type, or "H" columns covered
          with drywall, taped, sanded and prepared for finish or exposed tube
          type.


SECTION 9E - EXTERIOR SOFFITS

9E-01     All exposed exterior soffits shall be synthetic plaster.


SECTION 9F - INSULATION

9F-01     Fiberglass blanket type insulation shall be provided behind all
          exterior walls, except behind the spandrel panels where rigid
          insulation may be used.

9F-02     Rigid insulation shall be provided at the perimeter foundation walls.


SECTION 9G - CARPETING

9H-01     An allowance of Twenty Eight Dollars ($28.00) per square yard has been
          included for all carpet at the base building areas.


SECTION 9H - CERAMIC TILE

9I-01     Toilet rooms and showers shall have 1" x 1" or 2" x 2", unglazed,
          ceramic floor tile and 4 1/4" x 4 1/4" glazed, ceramic tile, full
          height, at wet walls. Ceramic tile to be selected from Color Group I.


                                       13
<PAGE>   81


                                   DIVISION 10

                                   SPECIALTIES


SECTION 10A - TOILET PARTITIONS

10A-01    Partitions shall be ceiling hung with a baked enamel finish. Provide
          toilet partitions as indicated on the drawings.


SECTION 10B - TOILET ACCESSORIES

10B-01    Provide brushed stainless steel accessories as indicated on the
          drawings. Accessories shall include double roll toilet paper holders,
          recessed paper towel dispenser/disposals, liquid soap dispensers,
          sanitary napkin vendors and disposals and grab bars at handicap
          toilets. Also, provide mop hooks at janitor's closets.


SECTION 10C - DOCK EQUIPMENT

10C-01    Provide two (2) mechanical edge of dock leveler. Leveler shall be
          Kelley E-Z Ramp Series STD-66, or approved equal. Dock bumper integral
          with the dock leveler shall be provided. Provide space next to truck
          dock for the compactor. Truck dock will be standard 48" height. Also,
          provide seals and/or shelters, swivel dock lights and bollards.

SECTION 10D - LOBBY ALLOWANCE

10D-01    Provide a $25,000.00 allowance for upgrades to main lobby finishes.


                                       14
<PAGE>   82


                                   DIVISION 12

                                   FURNISHINGS


SECTION 12A - BLINDS

12A-01    Vertical blinds shall be LouverDrape, Model EL (Elite) or approved
          equal, both traversing and rotating types.

12A-02    Blinds shall have top track only with manufacturer's standard baked
          enamel finish.

12A-03    Vertical blind blades are to be PVC solid core, 3 1/2" wide, .03"
          thickness. Color shall be manufacturer's standard color as selected by
          the Owner and Architect.

12A-04    Blinds shall be installed at all exterior wall windows.


                                       15
<PAGE>   83


                                   DIVISION 14

                                CONVEYING SYSTEM



SECTION 14A - ELEVATOR

14A-01    Two (2) standard package, 3,500 pound capacity hydraulic passenger
          elevators shall be provided at the main entrance lobby and one (1)
          standard package 5,000 pound capacity hydraulic passenger/material
          elevator near the truck dock. Speed shall be 125 feet per minute. Cab
          finish shall be stainless steel on front panels and doors, plastic
          laminate walls, and baked enamel frame and entrance doors on hall
          side. Include protective pads and hooks, handrail at rear, telephone
          box and cable, removable ceiling, certificate frame, emergency car
          lighting, exhaust fan, handicapped code requirements and 3'6" center
          opening doors.


                                       16
<PAGE>   84


                                   DIVISION 15
                                   MECHANICAL

DIVISION 15A - PLUMBING

15A-01    CODES, ORDINANCES AND PERMITS

          1.   All material and workmanship shall be in strict accordance with
               the following codes:

               A.  Massachusetts State Plumbing Code
               B.  Massachusetts State Building Code
               C.  National Fire Codes
               D.  Requirements of the Town of Bedford, Massachusetts
               E.  Department of Public Health

15A-02    SANITARY WASTE AND VENT SYSTEM
          1.   Interior waste and vent piping shall convey wastes to the
               underground sanitary waste system and shall be vented through the
               roof as required by code.

          2.   Exterior sanitary waste shall be connected to the Town's Sewer
               System as indicated on the site plan.

15A-03    ROOF DRAINAGE SYSTEM
          1.   Interior roof drains shall be adequately sized and installed to
               drain all roof surfaces and shall be connected to the storm drain
               outside the building line.

15A-04    COLD AND HOT WATER SYSTEMS
          1.   Cold and hot water systems shall be installed to service all
               fixtures and equipment indicated on the drawings requiring cold
               and hot water.

          2.   Cold and hot water shall be sized in accordance with the latest
               requirements of the applicable plumbing code.

Provide isolation valves at each toilet room by floor.

15A-05    GAS PIPING
          1.   Provide gas piping from the meter to the rooftop HVAC Units.


15A-06    PIPING AND FITTINGS
          1.   Piping and fittings shall be cast iron for sanitary and storm,
               and copper for water - all conforming to the latest ASTM and/or
               F.S. standards.

15A-07    PIPING AND DRAINAGE ACCESSORIES

          1.   Roof drains, wall/ground hydrants, cleanouts, and fixture
               carriers shall be as manufactured by J.R. Smith, Josam, Zurn or
               approved equal. pressure-reducing valves and back flow preventors
               shall be as manufactured by Watts or approved equal.


                                       17
<PAGE>   85


                      DIVISION 15 - MECHANICAL (Continued)

SECTION 15A - PLUMBING  (Continued)

15A-08    INSULATION
          1.   All above-ground cold water piping, valves and fittings shall be
               insulated, including the air chamber. Horizontal rain leaders and
               all roof drains shall be insulated.

15A-09    WATER METER
          1.   Water meter and piping shall be furnished and installed in
               accordance with the Town of Bedford, Massachusetts' requirements.

15A-10    PLUMBING FIXTURES
          1.   Water closets shall be wall-hung, elongated, flush valved closets
               with 1 1/2" top spuds and exposed valves as manufactured by
               Kohler Company or approved equal, with white, open front seats,
               no cover.
          2.   Urinals shall be wall-hung, white with 1 1/2" top spuds, exposed
               valves as manufactured by Kohler Company or approved equal.
          3.   Lavatories shall be Intregal Corian Type included in Section 6B.
          4.   Drinking fountains (one on each floor) shall be electric,
               semi-recessed, wall-mounted type as manufactured by Halsey Taylor
               or approved equal.
          5.   Electric hot water heater(s), sized to suit the base building
               requirements, shall be provided.
          6.   Handicap type fixtures will be provided in the toilet rooms as
               required by applicable codes.

15A-11    TESTING
          1.   All piping systems shall be tested in accordance with the
               applicable codes.


SECTION 15B - HEATING, VENTILATING AND AIR CONDITIONING

15B-01    Provide rooftop, variable volume, heating, ventilating and air
          conditioning to provide comfort heating and cooling on a year-round
          basis with controlled night set back and economizing features, and
          shall meet all applicable code requirements. Capacity will be based on
          350 S.F./Ton. Equipment shall be as manufactured by Trane or approved
          equal as selected by Gutierrez Construction Co., Inc. A low voltage,
          automatic temperature control system will also be provided. Includes
          HVAC distribution for the base building areas. Does not include HVAC
          distribution at tenant areas. The rooftop HVAC Units will provide gas
          fired morning warm-up to meet the requirements of the Massachusetts
          Energy Code. The rooftop HVAC Units will be provided with three feet
          (3') high vibration/insulated curbs to minimize noise and vibration.
          Rooftop units will not be operated without filters. Filters used
          during construction will be changed prior to Tenant's occupancy. The
          ventilation for the building will be designed per the Massachusetts
          State Code.


                                       18
<PAGE>   86


                       DIVISION 15 -MECHANICAL (Continued)


SECTION 15B - HEATING, VENTILATING AND AIR CONDITIONING (Continued)


15B-02    DUCT WORK

          all duct work shall be galvanized steel to meet the ASHRAE standards.
          Flexible duct run-outs shall not exceed six feet (6').

15B-03    GRILLES AND DIFFUSERS

          As required for the base building.

15B-04    TOILET ROOM EXHAUST

          A toilet room exhaust system shall be installed in accordance with the
          code requirements.

15B-05    NOISE LEVELS
          The HVAC System will be designed to meet or exceed an NCR of 35 to 40.


15B-06    HEATING, VENTILATING AND AIR CONDITIONING FOR TENANT AREAS

          A zoned heating, ventilating and air conditioning system, including
          distribution duct work, diffusers, return air grilles and thermostatic
          control for general office use is not included. Duct shafts and ducts
          will be provided from the rooftop equipment to the first, second and
          third floors. Above the ceiling will be used as a return air plenum.
          Return ductwork is not anticipated.


SECTION 15C - SPRINKLERS

15C-01    An automatic wet pipe, light hazard sprinkler system shall be provided
          for the base building. System shall be designed to meet the I.S.O. and
          NFPA #13 requirements. Heads at acoustical ceilings shall be chrome
          plated, semi-recessed, pendant type located at the center one third
          (_) of the 24" x 24" ceiling tile. Heads in open areas shall be the
          brass upright type. Testing shall be in accordance with NFPA Pamphlet
          No. 13. Furnish and install tamper and flow switches. Wiring shall be
          by the electrical subcontractor. Sprinkler distribution for the tenant
          areas is not included. Stub outs will be provided on each floor for
          Tenant distribution which will be sized for a density of one hundred
          twenty square feet (120 S.F.) to one hundred fifty square feet (150
          S.F.) per sprinkler head. Includes standpipe and fire hose connections
          as required.


                                       19
<PAGE>   87


                                   DIVISION 16

                                   ELECTRICAL

SECTION 16A - ELECTRICAL WORK

16A-01    SERVICE ENTRANCE

          The primary electric service and pad mounted transformer will be
          provided by the local utility company at no cost to Gutierrez
          Construction Co., Inc. Provide underground PVC conduit for electric
          and telephone as required by the utility companies. The secondary side
          of the electrical service will be 3,000 Amps at 480 Volt, 3-phase,
          4-wire.


16A-02    CODES AND STANDARDS

          Materials and workmanship shall conform with the latest editions of
          the following applicable codes, standards and specifications:

          1.   National Board of Fire Underwriters
          2.   Underwriter's Laboratories, Inc.
          3.   National Electrical Code
          4.   National Bureau of Standards Handbook 11-30, National Safety Code
          5.   Local and State Building Codes, and all other authorities having
               jurisdiction

16A-03    RACEWAYS AND CONDUCTORS

          Generally, wiring will consist of insulated conductors installed in
          3/4" minimum size, EMT. Flexible conduit (BX) will be used for
          terminal connection at all motors. Electrical metallic tubing will be
          used in areas above hung ceilings. Aluminum conduit may be used in
          concealed areas or in areas eight feet (8') above the floor. No
          aluminum conduit will be used in concrete or underground. BX may be
          used where allowed by applicable codes. Above the ceiling is used as a
          return air plenum. Conductors will be 600 volt copper, except where
          otherwise noted. Wire/cable #2 and larger may be aluminum. The
          following conductors will be used:

          1.   Power:         #12 Minimum 75(Degrees)C THWN
          2.   Lighting:      #12 Minimum 75(Degrees)C THWN
          3.   Control:       #14 Minimum 75(Degrees)C THW
          4.   Fixture:       #16 Minimum 90(Degrees)C MTW
          5.   Alarm:         #14 Minimum 75(Degrees)C THW


                                       20
<PAGE>   88


                      DIVISION 16 - ELECTRICAL (Continued)

SECTION 16A - ELECTRICAL WORK (Continued)
16A-04    GROUNDING SYSTEM

          Grounding will consist of copper clad steel rods connected with bare
          copper cable. The grounding system will be connected to the existing
          ground in the power plant at the pad mounted transformer. The
          interconnection conductors will be built into the main feeder cable.
          Building steel and all electrical equipment enclosures will be
          grounded.

16A-05    FEEDER CIRCUITS

          Feeders will supply 480/277 volt power from the main distributor to
          distribution panels. Main service will be adequately sized to serve
          the building's requirements as specified in these outline
          specifications. Includes transient voltage surge protection at the
          service entrance and branch circuit panel boards.

16A-06    TRANSFORMERS
          Dry-type K13 rated transformers will be provided for 120/208 volt
          panels.

16A-07    PANELBOARDS

          Panelboards will be 480/277 volt, 3-phase, 4-wire and 120/208 volt,
          3-phase, 4-wire with 200% neutrals with provisions for bolt in circuit
          breakers. Panelboards will be sized for the HVAC, 2 watts per square
          foot for the 277 volt light fixtures and 6 watts per square foot at
          for 120/208 volt power. Panelboards will be located in electrical
          closets on each floor.

16A-08    WIRING DEVICES, OUTLETS AND SWITCHES

          1.   Switches will be the quiet toggle type, NEMA standard.
          2.   Convenience outlets will be duplex grounding type, 20 amp rates,
               NEMA standard.
          3.   Device plates will be ivory-colored plastic.

16A-09    INDOOR LIGHTING
          Lighting will be fluorescent parabolic and/or fluorescent down lights
          for the base building. Lighting in tenant areas is not included.
          Alternately, the Tenant may elect to take a cash allowance.

16A-10    OUTDOOR LIGHTING

          Building lighting will be provided for security lighting and provide
          400 watt, high pressure sodium fixtures, energized at 277/480 volt
          with photocell control and time clock override. High pressure sodium
          fixtures will have integral ballasts. Fixtures will be pole-mounted in
          parking areas. Provide lighting at sidewalks for pedestrians. Lighting
          at the parking areas will be in accordance with the latest energy code
          requirements, but will provide a minimum of 0.5 foot candles at the
          remote parking areas.


                                       21
<PAGE>   89


                      DIVISION 16 - ELECTRICAL (Continued)


SECTION 16A - ELECTRICAL WORK (Continued)

16A-11    EMERGENCY LIGHTING AND POWER SYSTEM

          Provide emergency power for exit lights, emergency lighting and fire
          alarm system. Power source for emergency power shall be wet cell
          batteries located in the electrical rooms or a natural gas fired, roof
          mounted emergency generator as selected by the Landlord. Provide exit
          lights, emergency lights and fire alarm at all common areas as
          required by applicable codes. Exit lights, emergency lights and fire
          alarm distribution at tenant areas are not included.

16A-12    TELEPHONE EQUIPMENT

          Provide four (4) 4" sleeves at each telephone room through the second
          and third floor slabs. Interconnection and telephone equipment will be
          by the telephone company. Telephone interface will be the
          responsibility of the tenant and will be installed in the tenant's
          space.

16A-13    FIRE ALARM SYSTEM

          A local fully addressable fire alarm system with horn/light
          combinations, pull stations and annunciator panel will be provided for
          the base building. The main fire alarm panel and annunciator panel
          will be sized to accommodate the tenant area. Location of horn/lights,
          pull stations and annunciator panel shall be in accordance with
          applicable codes and the local fire department's requirements. Connect
          to the local fire department if available. Double shielded cable will
          be used.


                                       22
<PAGE>   90


                                   DIVISION 17

                                   EXCLUSIONS

1.   Power wiring for any special equipment or outlets other than those
     specified in these Outline Specifications.

2.   Special floor finishes, other than those previously mentioned.

3.   Special wall finishes, other than those previously mentioned.

4.   Special millwork items, other than those previously mentioned.

5.   Health Department or other regulatory agency requirements resulting from
     tenant's operations unknown to Gutierrez Construction Co., Inc.

6.   Furniture, furnishings, etc.

7.   Security, intercom or sound system.

8.   Vending machines or provisions for such.

9.   Kitchen equipment.

10.  Moveable partitions.

11.  Special exhaust systems.

12.  Underfloor duct systems.

13.  Drinking fountains, other than those specified.

14.  Drywall partitions, including demising walls and painting for tenant areas.

15.  Doors, frames and hardware for tenant areas.

16.  Vinyl base for tenant areas.

17.  Power distribution, lights, outlets, light switches, exit signs/lights, and
     emergency lights at tenant areas.

18.  Special modifications required for a day care center, if any.

19.  Sprinkler piping and heads at tenant areas.

20.  HVAC air terminal units, duct work, grilles and diffusers at tenant areas.


                                       23
<PAGE>   91


                                  EXHIBIT "C-2"

                         CERTIFICATE OF FINAL COMPLETION


Project: Building 4 Bedford Woods Office Park     Lease Date: ____________, 2000

Tenant:    RSA Security, Inc.

Location:  174 Middlesex Turnpike                 Date:
           Bedford, Massachusetts

Owner:                              Trade:
Bedford Woods Limited Partnership I


( )  All work has been completed in accordance with Article III of the Lease.

( )  All work has been completed in accordance with Article III of the Lease,
     except for that listed in attached schedule for which a credit has been
     taken.

Final Inspection was made _________________ in the presence of:

Remarks:

Owner must have completed or corrected all punch list items or accepted credit
for unsatisfactory or incomplete work and submitted all Close-out Documents as
listed on Close-out Documents - Record & Transmittal Form.

This is to certify that RSA Security, Inc. will not be held responsible for any
bills, liens, claims or demands in connection with the above noted project. All
workmanship and materials are hereby guaranteed in accordance with stipulations
in the Contract Documents and Lease on Certificate of Substantial Completion.

By:________________________________         By:_________________________________

Title:_____________________________         Title:______________________________

Date:______________________________         Date:_______________________________

NOTE: See also definition of Substantial Completion in Article III of the Lease.


                                       24
<PAGE>   92


                                   EXHIBIT "D"
                              INTENTIONALLY DELETED


<PAGE>   93


                                   EXHIBIT "E"
                              RULES AND REGULATIONS


1.   No curtains, blinds, shades, screens, or signs other than those furnished
     by Landlord shall be attached to, hung in, or used in connection with any
     window or door of the Premises without the prior written consent of the
     Landlord. All interior Tenant signage is at Tenant's expense and must be
     installed or affixed by a contractor first approved by Landlord acting
     reasonably and without delay. The style, size and color of any interior
     signage visible from the exterior of the Premises must also be reasonably
     acceptable to Landlord.

2.   As well as any security (door access) system provided and installed by
     Tenant, as reasonably approved by Landlord, Tenant shall be allowed to
     place additional locks or bolts upon doors and windows within the Premises.
     Tenant recognizes that these additional locks and bolts could prove to be a
     hindrance to Landlord providing building services such as cleaning and
     maintenance. Tenant must, upon the termination of its tenancy, remove all
     additional locks and bolts and restore all original door hardware and
     provide Landlord all Building keys either furnished to or otherwise
     procured by Tenant; and in the event of the loss of any keys so furnished,
     Tenant shall pay to Landlord the reasonable cost thereof.

3.   Canvassing, soliciting and peddling in the Building are prohibited, and
     Tenant shall cooperate to prevent the same.

4.   Tenant shall comply with all reasonably necessary security measures from
     time to time established by Landlord for the Park.

5.   Should Tenant's organization have a non-smoking policy presently in effect
     for their visitors and/or employees or institute such a policy during the
     Term of this Lease, Tenant shall set aside a smoking area within the
     Premises, properly ventilated and/or with smoke filtration units, so as not
     to interfere with any fire protection devices, such as smoke detectors, or
     the quality of air recirculated in the Building's HVAC system.

6.   Tenant shall comply with the Park Covenants attached hereto as Exhibit "I".


<PAGE>   94


                                   EXHIBIT "F"
                                OPTION TO EXTEND


     The Tenant has the option to extend this Lease for two (2) successive five
(5) year terms ("Extended Term(s)", and separately the "First Extended Term" and
the "Second Extended Term"), the exercise of each of which shall automatically
extend the Term of this Lease without the necessity of additional documentation,
so long as there does not exist any Event of Default hereunder at such time and
so long as Tenant is then leasing at least seventy-five percent (75%) of the
Premises. The option to extend shall be deemed to have been exercised as to the
First Extended Term by Tenant's notification to Landlord that it elects to
exercise its first option to extend at least twelve (12) months but not more
than eighteen (18) months prior to the end of the initial Term hereunder, and as
to the Second Extended Term by Tenant's notification to Landlord that it elects
to exercise its second option to extend at least twelve (12) months but not more
than eighteen (18) months prior to the end of the First Extended Term. Each
Extended Term shall be upon the same terms and conditions as are set forth in
this Lease, including, without limitation, the Tenant's obligations to pay
Operating Cost Reimbursement set forth in Section 4.2.1 and Real Estate Tax
Reimbursement set forth in Section 4.2.2, except that (i) there shall be no
additional option to extend after the termination of the Second Extended Term or
the failure to exercise the first option, whichever shall first occur, (ii) the
annual Fixed Rent for the First Extended Term shall be equal to the Market Rent
(as defined in and determined in accordance with Exhibit P), and (iii) the
annual Fixed Rent for the Second Extended Term shall be equal to the Market Rent
(as defined and determined in accordance with Exhibit P). In no event, however,
shall the annual Fixed Rent and additional rent for the First Extended Term and
for the Second Extended Term be less than the Annual Fixed Rent and Additional
Rent adjusted in accordance with Section 3.8 of this Lease then in effect as of
the last day immediately preceding the First Extended Term or Second Extended
Term, as applicable.


<PAGE>   95


                                   EXHIBIT "G"

                              ESTOPPEL CERTIFICATE


     THIS CERTIFICATE is made to ___________________________ (the "Bank") with
respect to a lease dated _________________ execute by and between
________________________ (the "Landlord") and the undersigned (as "Tenant"),
covering a building (a portion of a building) located in _____________ (the
"Lease"), as amended by (list all amendments):

     The undersigned has been advised that the Bank is about to enter into a
transaction whereby the Bank is making a loan secured by the aforesaid real
estate and the Lease to the undersigned, and under which the Bank may acquire an
ownership interest in such real estate. In connection with this transaction, the
entire interest of the Landlord under the Lease to the undersigned will be
assigned to the Bank. The undersigned acknowledges that the Bank is and will be
relying upon the truth, accuracy and completeness of this letter in proceeding
with the transaction described above.

     The undersigned, for the benefit of the bank, their successors and assigns,
hereby certifies, represents, warrants, agrees and acknowledges that:

     1.   The Lease is in full force and effect in accordance with its terms
without modification or amendment except as noted above and the undersigned is
the holder of the Tenant's interest under the Lease.

     2.   The undersigned is in possession of all of the Premises described in
the Lease under and pursuant to the Lease and is doing business thereon; and the
Premises are completed as required by the Lease.

     3.   The undersigned has no claims or offsets with respect to any of its
obligations as Tenant under the Lease, and neither the undersigned nor the
Landlord is claimed to be in default under the Lease.

     4.   The undersigned has not paid any rental or installments thereof in
advance of the due date as set forth in the Lease.

     5.   The undersigned has no notice of prior assignment, hypothecation or
pledge of rents of the Lease or the Landlord's interest thereunder or of the
Tenant's interest thereunder.

     6.   The term of the Lease has commenced and is presently scheduled to
expire on __________, ____. If there are any rights of extension or renewal
under the terms of the Lease, the same have not, as of the date of this letter,
been exercised.

     7.   Until such time as the Bank shall become the Landlord, if the
undersigned should assert a claim that the Landlord has failed to perform an
obligation to the undersigned under the terms of the Lease or otherwise, notice
thereof shall promptly be furnished to the Bank; and the undersigned agrees that
the undersigned will not exercise any rights which the undersigned might
otherwise have on account


<PAGE>   96


of any such failure until notice thereof has been given to the Bank, and the
Bank has had the same opportunity to cure any such failure as the Landlord may
have under the terms of the Lease.

     8.   Each of the statements set forth in Paragraphs 1 through 7 are true,
accurate and complete except as follows (state specifically any exception):


DATED

ATTEST:

                                             By:
                                                 -------------------------------

                                             Its:
                                                  ------------------------------


                                       2
<PAGE>   97


                                   EXHIBIT "H"

                     TENANT'S CONTRACTORS AND SUBCONTRACTORS
                         MINIMUM INSURANCE REQUIREMENTS


INSURANCE

Before commencing work, the Subcontractor shall procure and maintain at its own
expense until final acceptance of the work, upon all operations and the
operations of its Subcontractors, suppliers or material men on the Project, the
following policies of insurance with Gutierrez Construction Co., Inc., and the
Landlord as additional insured. All policies, including Workers' Compensation,
will include a "Waiver of Rights of Subrogation" against Gutierrez Construction
Co., Inc., and the Landlord.

     a.   WORKER'S COMPENSATION AND EMPLOYERS LIABILITY INSURANCE

          Subcontractor shall provide and maintain Workers' Compensation and
          Employer's Liability Insurance covering all of its employees in
          conformance with laws of the state in which the work and/or Contract
          Documents are to be performed. Such insurance shall not have a limit
          of less than the following:

          Employer's Liability -        $100,000 Each Accident
                                        $500,000 Disease Policy Limit
                                        $100,000 Disease each Employee

     b.   COMMERCIAL GENERAL LIABILITY

          Subcontractor shall procure and maintain coverage to include all
          operations of the insured and/or Contract Documents and coverage for
          all liability assumed with the following limits and extensions of
          coverage.

          Coverage to be on an Occurrence Form
          Coverage to include: Premises and Operations (including X-Explosion,
          C-Collapse and A-Underground Coverages as applicable); Independent
          Contractor's Protective Personal Injury; Contractual; Broad Form
          Property Damage, including Completed Operations with the following
          limits:

          Bodily Injury and Property Damage - $1,000,000 Each Occurrence
                                              $2,000,000 General Aggregate
                                              $1,000,000 Personal Injury

Products and Completed Operations Insurance Aggregate Limit of $2,000,000 shall
be maintained for two (2) years after final payment and Subcontractor shall
continue to provide evidence of such coverage to Gutierrez Construction Co.,
Inc., and the Landlord on an annual basis during the two year period.

     c.   BUSINESS AUTOMOBILE LIABILITY


<PAGE>   98


          Subcontractor shall procure and maintain Business Automobile Liability
          Insurance covering owned, non-owned and hired motor vehicles with the
          following combined single limits:

          Bodily Injury and Property Damage - $1,000,000 Each Occurrence
          (C.S.L.)

     d.   UMBRELLA LIABILITY

Subcontractor shall procure and maintain an Umbrella Liability Policy with
limits of $2,000,000.


<PAGE>   99


                                   EXHIBIT "I"

                                 PARK COVENANTS

     Landlord agrees with Tenant to enforce, or cause to be enforced, these Park
Covenants with all due diligence to preserve the quality and appearance of the
Park.

     The Lot is approximately 25,5806 acres and is located in an approximately
seventy-nine (79) acre office/research and development park shown on the Plan of
the Park attached hereto as part of Exhibit A and more particularly described
therein and elsewhere in this Lease, as the same, including without limitation
the Common Areas of the Park, may be amended by Landlord from time to time in
accordance with and subject to the provisions of Section 2.1 of this Lease.

     All lots of land comprising the Park (which lots, including without
limitations the Lot, are individually called the "Parcel" and collectively the
"Parcels") are subject to the following restrictions which shall bind Bedford
Woods Limited Partnership I (collectively "Grantor") as original owner of the
Park and its successors in title.

     A.   All parcels shall have facilities for parking, loading and unloading
sufficient to serve any uses of the Parcels without using adjacent streets for
such purpose. On-street parking shall be prohibited. All parking, trucking and
vehicular maneuvering areas for a Parcel shall be contained within such Parcel.

     B.   No exterior loading platforms shall be visible from any primary way or
proposed primary way serving the Park. Screening and planting may be used for
this purpose.

     C.   No open or outside storage shall be done on any Parcel, other than
normal and customary trash compactors and containers on locations to be
reasonably approved by Landlord in advance.

     D.   Signs shall conform to the sign ordinances of the Town of Bedford. Any
variance from such ordinance granted by the Town of Bedford must also be
approved by Grantor in the manner provided below in Section I.

     E.   No condition or use of any Parcel will be permitted which is
objectionable by reason of noise, odor, vibration, smoke, radiation, the
hazardous nature of the use, or the violation of environmental laws or
regulations adopted by the Town of Bedford, the Commonwealth of Massachusetts,
the Federal Government or any Court.

     F.   All utilities serving a Parcel shall be placed underground, unless
prohibited by the utility company. Any exterior lighting on a Parcel shall
either be indirect or of such controlled focus and intensity as not to disturb
street traffic or the occupancy of any adjacent Parcel.

     G.   The exterior appearance of any buildings in the Park, including
landscaping thereon, shall be kept neat and orderly and free from litter.

     H.   No building, exterior sign, fence, wall, exterior lighting or other
structure shall be erected or allowed to maintain on any portion of the Park or
exterior structural alteration or addition made,


<PAGE>   100


except pursuant to plans approved in writing by Grantor as to landscaping,
parking and architectural conformity with existing buildings in the Park.

     I.   The Grantor may from time to time by written instrument in recordable
form grant variance from any one or more of these restrictions (except
restriction H for which variances may not be granted) where the Grantor
reasonably determines that the variance can be granted without substantial
detriment to the intent and purpose of the restrictions and without substantial
detriment to the Land, and portions of the Park theretofore built upon. If
Tenant is occupying seventy-five percent (75%) or more of both this Building and
Building 3 in the Park then variances from these restrictions shall require the
consent of Tenant which consent shall not be unreasonably withheld, conditioned
or delayed. Failure by Tenant to respond in writing to a proposed variance
request within ten (10) days of receipt of such variance request shall be deemed
acceptance by Tenant of such variance request.

     J.   Written approval by the Grantor as to any buildings, signs,
structures, alterations, additions and landscaping approved by Grantor in good
faith shall be conclusive evidence of compliance with these restrictions. The
Grantor agrees to furnish to any grantee such written instruments in recordable
form as may reasonably be requested by the grantee as evidence of such
compliance.

     K.   Building 3 and Building 4 (i.e. those buildings closest to Noreen
Drive, Bedford, Massachusetts) shall install and maintain as operable all
interior non-emergency lighting on those sides of the Building 3 and Building 4
which face Noreen Drive (i.e. the Northwest) and in the case of Building 4 the
Southwest, on motion detector shutoff switches which turn off the lights in
those offices or spaces when motion is not detected therein.

     L.   The term "Grantor", as herein used, shall mean Bedford Woods Limited
Partnership I and any of its successors in title to whom the Grantor has
expressly granted of record the rights to enforce these restrictions.

     This property is subject to a Special Permit from the Town of Bedford,
Massachusetts for increased number of parking spaces. The Landlord and Tenant
agree to cooperatively participate in, and actively support, Landlord's and/or
the Park's Transportation Demand Management Plan wherever possible to achieve
the Park's goal of peak hour traffic reduction. Tenant shall reimburse Landlord
for its pro rata share of Landlord's Transportation Demand Management Plan
expenses.

     This Plan may include such services as:

          -    Access GIS/Rideshare to assist in matching interested employees
               into car-pools;

          -    Provide a "Guaranteed Ride" program which provides a back-up in
               the event of an emergency;

          -    Promotional events at their facilities to distribute
               transportation information and answer questions;

          -    Operate a "transportation store" to provide up-to-date
               information on transit schedules, services, and fares;


                                       2
<PAGE>   101


          -    Organize van-pools;

          -    Work with state agencies including MassHighway, EOTC, CARAVAN
               Commuters, or others, as necessary on transportation matters; and

          -    Implement preferential parking for rideshares.


                                       3
<PAGE>   102


                                   EXHIBIT "J"

                            LESSEE'S LEASE STATEMENT
                                       AND
             SUBORDINATION, NON-DISTURBANCE AND ATTORNMENT AGREEMENT

     THIS AGREEMENT is made and entered into as of this _____ day of November,
2000, by and among WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking
association (hereinafter called the "Lender"), RSA SECURITY, INC., a
________________ corporation (hereinafter called the "Tenant"), and BEDFORD
WOODS LIMITED PARTNERSHIP I (hereinafter called the "Landlord").

                                   WITNESSETH:

     WHEREAS, Landlord owns certain real property commonly known as Building
Three of Bedford Woods, and located in Bedford, Middlesex County, Massachusetts,
and more particularly described in Exhibit "A" attached hereto and made a part
hereof (said property being hereinafter called the "Property"); and

     WHEREAS, Landlord and Tenant made and entered into that certain Lease dated
as of the _____ day of November, 2000, with respect to certain premises located
on the Property constituting the Premises therein described (said Lease being
hereinafter called the "Lease", and said premises being hereinafter called the
"Leased Premises"); all capitalized terms used herein and not otherwise defined
shall have the same meaning as set forth in the Lease; and

     WHEREAS, Landlord has entered into and delivered that certain Construction
Mortgage and Security Agreement in favor of Lender recorded in the Middlesex
North district Registry of Deeds on _____________, 2000 as Instrument No.
_____________ prior to the recording of this Agreement (said Construction
Mortgage and Security Agreement being hereinafter called the "Mortgage"),
granting a lien on the Property to secure the payment of the indebtedness
described in the Mortgage; and

     WHEREAS, on or about the date hereof, Landlord has entered into and
delivered that certain Assignment of Leases and Rents in favor of Lender
recorded in the Middlesex North District Registry of Deeds on
__________________, 2000 as Instrument No. ________ prior to the recording of
this Agreement (said Assignment of Leases and Rents being hereinafter called the
"Assignment of Leases"), assigning all of Landlord's right, title and interest
as Lessor under the Lease to further secure the indebtedness described in the
Mortgage; and

     WHEREAS, the Mortgage and the Assignment of Leases secure the repayment of
a loan from Lender to Landlord in the principal amount of $______________ (the
"Loan") as evidenced by that certain Promissory Note of Landlord to Lender dated
_______________, 2000 (the "Note"); and

     WHEREAS, the proceeds of the Note are being advanced pursuant to the terms
of that certain Construction Loan Agreement between Landlord and Lender dated
____________, 2000 (the "Construction Loan Agreement"): the Note, Mortgage,
Assignment of Leases, Construction Loan


<PAGE>   103


Agreement and all other documents extended in connection with the Loan are
sometimes hereinafter collectively referred to as the "Loan Documents"; and

     WHEREAS, The Gutierrez Company, The Gutierrez Construction Co., Inc.,
Arturo J. Gutierrez and John A. Cataldo (collectively, the "Guarantors") have
executed and delivered to Lender certain guaranties in connection with the Loan;
and

     WHEREAS, the Lender represents that it is the sole holder of the Mortgage
and the Note and other loan documents secured thereby; and

     WHEREAS, the parties hereto desire to enter into this Non-Disturbance,
Attornment and Subordination Agreement;

     NOW, THEREFORE, for and in consideration of the mutual covenants
hereinafter set forth and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Lender, Tenant and Landlord hereby
covenant and agree as follows:

     1.   ESTOPPEL - Tenant hereby certifies to Lender that, as of the date of
this Agreement: (i) the Lease, as described above, is the true, correct and
complete Lease and has not been modified or amended and constitutes the entire
agreement between Landlord and Tenant, (ii) to the best of Tenant's knowledge,
there are no defaults of Landlord under the Lease and there are no existing
circumstances which with the passage of time, or giving of notice, or both,
would give rise to default under the Lease and/or allow Tenant to terminate the
Lease, (iii) Tenant is satisfied with all of the work done by and required of
Landlord to date, such work has been done in accordance with plans and
specifications approved by Tenant, and as of the date hereof Tenant is not aware
of any defect in the work or has not rejected any of the work done by Landlord
on the Leased Premises (only includable if Tenant agrees with, after work is
completed), (iv) that no rent under the Lease has been paid more than thirty
(30) days in advance of its due date; (v) that the Tenant, as of this date, has
no charge, lien or claim of offset under the Lease or otherwise, against rents
or other charges due to become due thereunder; and (vi) that Tenant has not
assigned any of its rights under the Lease nor has Tenant sublet any portion of
the Demised Premises to any other party. If this Agreement is being delivered
prior to completion of all of Landlord's Work (as such term is defined in the
Lease) on the Leased Premises, Tenant agrees that, promptly after request of the
Lender therefor, it will provide an estoppel certificate to Lender following
completion of such work indicating whether Tenant has accepted the work and
begun payment of rent.

     2.   NON-DISTURBANCE - Lender agrees that if Lender comes into possession
of or acquires title to all or any part of the Leased Premises or the Lot (as
defined in the Lease) as a result of foreclosure or other enforcement of the
Mortgage or the Assignment of Leases, or both, then so long as no default under
the Lease by Tenant exists and continues beyond the expiration of all applicable
cure periods (after notice, if any, required by the Lease) as would entitle the
Landlord under the Lease to terminate the Lease or would cause, without any
further action on the part of such Landlord, the termination of the Lease, the
Lease shall not be terminated, nor shall Tenant's use, possession or enjoyment
of the Leased Premises and appurtenant rights and interests or rights under the
Lease be interfered with. Following a foreclosure or other action or proceeding
in the nature of foreclosure instituted under or in connection with the Mortgage
or the Assignment of Leases, or the acquisition of title to the Leased Premises,
the person or entity acquiring the interest of the Landlord under the Lease as a
result of any such action or


                                       2
<PAGE>   104


proceeding or deed in lieu of any such action or proceeding (hereinafter called
the "Purchaser") or Lender if Lender takes possession of the Property shall have
all rights and obligations of Landlord under the Lease, except as expressly
otherwise set forth herein, provided, however, that neither the Purchaser nor
the Lender shall be (a) liable for any act or omission of any prior lessor under
the Lease provided that nothing herein shall (i) relieve such Purchaser or
Lender from curing any continuing non-monetary defaults of Landlord after
receipt of requisite notices from Tenant, all in accordance with the Lease or
(ii) impair the Tenant's offset or abatement rights as provided in clause 2(c)
below with respect to any continuing monetary defaults of Landlord under the
Lease; or (b) liable for the return of any security deposit which Tenant under
the Lease has paid under the Lease unless such security deposit is received by
Lender; or (c) subject to any offsets, abatements or defenses which the Tenant
under the Lease might have against any prior lessor under the Lease unless
Lender has received prior written notice of the offset, abatement or defense and
opportunity to cure the same in accordance with Paragraph 9 below; or (d) bound
by any base rent, or any other payments which the Tenant under the Lease might
have paid for more than the current month to any prior lessor under the Lease;
or (e) bound by any amendment or modification of the Lease made without Lender's
prior written consent (Lender hereby agreeing not to unreasonably withhold or
delay its consent); or (f) bound by any assignment or sublease of the Tenant's
interest in the Lease made without obtaining Lender's prior written consent
(such consent not to be unreasonably withheld or delayed), except where the
consent of the Landlord is not required pursuant to the provisions of Section
6.1.6 of the Lease; or (g) personally liable for any default under the Lease or
any covenant or obligation on its part to be performed thereunder as Landlord,
it being acknowledged that Tenant's sole remedy in the event of such default
shall be to proceed against Purchaser's or Lender's interest in the Property and
the rents, or other proceeds arising therefrom.

     3.   TENANT'S ELECTIONS - Notwithstanding any other provision to the
contrary contained in the Lease, if prior to the substantial completion of the
Landlord's Work or Tenant's Work (as defined in the first paragraph of Section
3.1 and Section 3.1.1 of the Lease), Lender accelerates the Note and demands
payment of same, Lender then will give written notice of such acceleration and
demand (the "Demand Notice") to Tenant. Upon receipt by Tenant of the Demand
Notice, in a written notice (the "Election Notice") to Lender, provided a copy
thereof is simultaneously given by Tenant to Landlord and further provided
Lender receives the Election Notice within sixty (60) days of Tenant's receipt
of the Demand Notice (the "Election Period"), Tenant may elect the option set
forth below. Lender agrees not to acquire title to or take possession of the
Leased Premises (a) during the Election Period and (b) if Tenant exercises its
election below, for a period of forty-five (45) days after Lender receives the
Election Notice (the "Standstill Period"). If Tenant shall fail to deliver to
Lender the Election Notice prior to the expiration of the Election Period, then
all rights and obligations of Tenant and Lender under this Paragraph 3 shall
automatically cease and terminate.

     In the Election Notice, Tenant may elect to purchase from Lender all of
Lender's right, title and interest in and to the Loan Documents, for a sum equal
to the total amount then due and owing to Lender thereunder (the "Sale") as of
the closing (the "Sale Closing") of the Sale, including, but not limited to, all
outstanding principal, interest, late fees, charges and attorney's fees due
under the Loan Documents as of the Sale Closing, together with all fees, costs
and expenses incurred by Lender in connection with the preparation of all
documents reasonably required by Lender to evidence the Sale (collectively, the
"Obligations"), which documents shall be in form and substance reasonably
satisfactory to Lender and which shall be without recourse to Lender and shall
not contain any warranties or representations other than a representation from
Lender to Tenant that (x) it owns the Loan Documents, (y) the Loan


                                       3
<PAGE>   105


Documents are free and clear of any liens or any other person's or entity's
interest therein and (z) Lender has all necessary power and authority without
need for consent from any other person or entity to sell the Loan Documents or
has obtained all necessary consents therefor; PROVIDED, HOWEVER, Tenant's right
to purchase the Loan Documents hereunder automatically shall expire and Lender
no longer shall have any obligations to Tenant under this clause (i) or clause
(ii) below if the Sale Closing and payment to Lender of the Obligations in
immediately available funds have not occurred on or before forty-five (45) days
after Lender receives the Election Notice.

     4.   LENDER'S ELECTIONS - In the event that Lender acquires title to or
possession of all or any part of the Leased Premises at any time after the
expiration of the Standstill Period, whether pursuant to a foreclosure
proceeding or otherwise, then within thirty (30) days thereafter, the Lender may
elect to deliver a written notice to the Tenant stating that either (i) the
Lender intends to perform the construction obligations of the Landlord set forth
in Article 3 of the Lease (the "Construction Obligations"), or (ii) the Lender
does not intend to perform the Construction Obligations. A notice delivered by
the Lender pursuant to clause (i) is referred to herein as an "Opt-In
Construction Notice" and a notice delivered by the Lender pursuant to clause
(ii) is referred to herein as an "Opt-Out Construction Notice".

     In the event that Lender does not deliver either an Opt-Out Construction
Notice or an Opt-In Construction Notice to the Tenant within said thirty (30)
days after acquisition of title or possession, then Tenant may elect to deliver
a written request (a "Construction Confirmation Request") to the Lender
requesting that Lender deliver either an Opt-Out Construction Notice or an
Opt-In Construction Notice.

     If either (a) Lender delivers an Opt-Out Construction Notice to Tenant, as
aforesaid, or (b) Lender does not deliver an Opt-In Construction Notice to
Tenant by not later than thirty (30) days after receipt of Tenant's Construction
Confirmation Request, then Lender shall not be obligated to perform the
Construction Obligations in accordance with the terms and provisions of the
Lease. If Lender delivers an Opt-In Construction Notice as aforesaid, then
Lender shall be obligated to perform the Construction Obligations in accordance
with the terms and provisions of the Lease. If Lender timely delivers an Opt-Out
Construction Notice to Tenant by not later than thirty (30) days after receipt
of Tenant's Construction Confirmation Request as aforesaid, or Lender does not
deliver an Opt-In Construction Notice to Tenant by not later than thirty (30)
days of its receipt of Tenant's Construction Confirmation Request, then (a)
Lender shall have no obligation to perform the Construction Obligations, and (b)
Tenant may elect to terminate the Lease by providing written notice of such
election to Lender. If Tenant elects to terminate the Lease, the Lease shall be
terminated effective as of the date specified in Tenant's notice. Thereafter,
the Lease shall be null and void and of no further force or effect, and neither
the Tenant nor the Lender shall have any further liabilities or obligations
thereunder.

     If (a) Lender sells, conveys, assigns, pledges or transfers its interest in
the Loan, or (b) Lender sells the Leased Premises, or any part thereof, at a
foreclosure sale, or (c) if Lender acquires title to the Leased Premises and
subsequently conveys the Leased Premises, then, in any such event, concurrently
with such transaction, Lender shall transfer, assign and convey all right, title
and interest of the Lender in and to the Security Deposit then held by it, if
applicable, to such purchaser, assignee, or transferee. Notwithstanding anything
to the contrary contained in this Section, if Lender so transfers, assigns or
conveys all right, title and interest of the Lender in and to the Security
Deposit, if applicable, as


                                       4
<PAGE>   106


aforesaid, then Lender shall have no liability for the return of the Security
Deposit.

     5.   ATTORNMENT - Unless the Lease is terminated in accordance with
Paragraphs 2 or 4 of this Agreement or in accordance with the terms of the
Lease, if the interests of the Landlord under the Lease shall be transferred by
reason of the exercise of power of sale contained in the Mortgage (if
applicable), or by any foreclosure or other proceeding for enforcement of the
Mortgage, or by deed in lieu of foreclosure or such other proceeding, or if
Lender takes possession of the Property pursuant to any provisions of the
Mortgage, Tenant shall be bound to the Purchaser or Lender, as the case may be,
under all of the terms, covenants and conditions of the Lease for the balance of
the term thereof and any extensions or renewals thereof which may be effected in
accordance with any option therefor in the Leases with the same force and effect
as if the Purchaser or Lender were the lessor under the Lease, and Tenant, as
Lessee under the Lease, does hereby agree to attorn to the Purchaser and Lender
if it takes possession of the Property, as its lessor under the Lease. Such
attornment shall be effective and self-operative without the execution of any
further instruments upon succession by Purchaser to the interest of the lessor
under the lease or the taking of possession of the Property by Lender.
Nevertheless, Tenant shall, from time to time, execute and deliver such
instruments evidencing such attornment as Purchaser or Lender may reasonably
require. The respective rights and obligations of Purchaser, Lender and of the
lessee under the Lease upon such attornment, to the extent of the then remaining
balance of the term of the Lease and any extensions and renewals, shall be and
are the same as now set forth in the Lease, except as otherwise expressly
provided herein.

     6.   SUBORDINATION - Subject to the provisions of this Agreement, Tenant
hereby subordinates all of its right, title and interest as Lessee under the
Lease to the right, title and interest of Lender under the Mortgage, and Tenant
further agrees that the Lease now is and shall at all times continue to be
subject and subordinate in each and every respect to the Mortgage and to any and
all increases, renewals, modifications, extensions, substitutions, replacements
and/or consolidations of the Mortgage and to all sums secured thereby with the
same force and effect as if the Mortgage had been executed, delivered and
recorded prior to the execution and delivery of the Lease. Notwithstanding the
foregoing, such subordination shall not decrease or impair the rights of Tenant
under the Lease, except as specifically set forth herein.

     7.   OTHER CONDITIONS - Notwithstanding anything to the contrary contained
in this Agreement or in the Lease, Lender, Tenant and Landlord agree that to the
extent required by the Lease, and provided that (i) Tenant has not defaulted in
the payment of rent or other charges under the Lease, (ii) Landlord has not
defaulted in the payment of debt service or other payments under the loan
documents and (iii) neither Landlord nor Tenant has filed a voluntary petition
in bankruptcy under Title 11 of the United States Code or had an order for
relief issued against it and not dismissed within thirty (30) days of issuance
or has filed any petition or answer seeking or acquiescing in any
reorganization, arrangement, composition, readjustment, liquidation, dissolution
or similar relief for itself under any present of future federal, state or other
law or regulation relating to bankruptcy, insolvency or other relief of debtors
or consented to or acquiesced in the appointment of any custodian, trustee,
receiver, conservator or liquidator for it or all or any substantial part of its
property or made an assignment of a substantial portion of its assets for the
benefit of creditors (or if any of the foregoing has occurred only with respect
to Landlord and Tenant has exercised its election under clause (ii) of Paragraph
3 above by giving Lender the Election Notice required therein), then in the
event of an insured casualty to the Leased Premises, and if Landlord satisfies
the conditions provided for hereafter, Lender shall hold the


                                       5
<PAGE>   107


balance of any casualty and rental interruption proceeds after proof and
adjustment and shall use such funds for the following purposes: (x) to pay costs
and obligations secured by the Mortgage (the "Secured Obligations") as such
become due during the course of reconstruction or repair of the Leased Premises,
(y) to reimburse Landlord, in accordance with the terms and conditions set forth
below, for the costs of reconstruction or repair of the Leased Premises, and (z)
upon completion of such reconstruction or repair, to apply any excess to the
payment of the Secured Obligations. Such funds shall be made available as
provided above and as provided in Section 4.8(b) of the Mortgage upon the
Landlord's prior satisfaction of such conditions as the Lender may reasonably
establish with respect thereto (each of which must be complied with in a manner
reasonably satisfactory to the Lender, with all documents, instruments,
agreements, or evidence to be in form and substance satisfactory to the Lender),
within sixty (60) days of the date of such damage or destruction to the Leased
Premises, including without limitation, the following (hereinafter referred to
as the "Funding Requirements"):

     (i)    delivery of estoppel certificate(s) or other satisfactory evidence
            that the Lease remains in full force and effect and will remain in
            full force and effect after such repair and restoration, without any
            right of termination or cancellation during the projected course of
            said repair or restoration;

     (ii)   delivery of plans and specifications, construction budget,
            construction contract, and construction schedule for such repair and
            restoration, satisfactory to Lender;

     (iii)  delivery of evidence of compliance with all applicable state,
            federal and local laws, ordinances and regulations relating to such
            repair and restoration, and the issuance of all required permits,
            licenses and approvals relative thereto;

     (iv)   delivery of evidence of the availability of any funds necessary to
            complete such repairs and restoration in excess of such proceeds,
            which funds, at the request of the Lender, shall be deposited with
            the Lender to be disbursed with such proceeds;

     (v)    builder's all risk insurance;

     (vi)   rent loss insurance sufficient to pay all operating costs and debt
            service confirmed by the insurer to be available for the period of
            repair and restoration;

     (vii)  evidence that the insurer under such policies of fire or other
            casualty insurance does not assert any defense to payment under such
            policies against Lender, Landlord or any tenant of the Leased
            Premises;

     (viii) execution of any documentation deemed reasonably necessary by the
            Lender to provide for the disbursement of such funds in a manner
            typical to a construction loan;

     (ix)   delivery of evidence that the repair or restoration can be completed
            prior to the then applicable maturity date of the note;

     (x)    Landlord delivers to Lender a written undertaking to expeditiously
            commence and to satisfactorily complete with due diligence the
            necessary restoration;


                                       6
<PAGE>   108


     (xi)  compliance of such other reasonable non-financial terms and
           conditions customary for construction loans of the size and scope
           involved with such repairs and restoration; and

     (xii) such other requirements as provided in Section 4.8(a) of the Mortgage
           provided that such requirements do not include the execution of a
           separate guaranty of completion by Tenant for the purpose of making
           funds available for restoration under this Paragraph 6.

     8.    ASSIGNMENT OF LEASES - Tenant hereby acknowledges that all of
Landlord's right, title and interest as Lessor under the Lease is being duly
assigned to Lender pursuant to the terms of the Assignment of Leases, and that
pursuant to the terms thereof, all rental payments under the Lease shall
continue to be paid to Landlord in accordance with the terms of the Lease unless
and until Tenant is otherwise notified in writing by Lender. Upon receipt of any
such written notice from Lender, Tenant covenants and agrees to make payment of
all rental payments then due or to become due under the Lease directly to Lender
or to Lender's agent designated in such notice and to continue to do so until
otherwise notified in writing by Lender. Landlord hereby irrevocably directs and
authorizes Tenant to make rental payments directly to Lender following receipt
of such notice and covenants and agrees that Tenant shall have the right to rely
on such notice without any obligation to inquire as to whether any default
exists under the Mortgage or the Assignment of Leases or the indebtedness
secured thereby, and notwithstanding any notice of claim of Landlord to the
contrary, that Landlord shall have no right or claim against Tenant for or by
reason of any rental payments made by Tenant to Lender following receipt of such
notice, and all such payments by Tenant to Lender are fully authorized by
Landlord and treated for all purposes as payments of Fixed or Additional Rent
under the Lease. Except as otherwise specifically set forth in the Lease, Tenant
further acknowledges and agrees: (a) that under the provisions of the Assignment
of Leases, the Lease cannot be terminated (nor can Landlord accept any surrender
of the Lease) or modified in any of its terms, or consent be given to the waiver
or release of Tenant from the performance or observance of any obligation under
the Lease without the prior written consent of Lender, and without such consent,
no rent may be collected or accepted by Landlord more than one month in advance;
and (b) that the interest of Landlord as Lessor under the Lease has been
assigned to Lender for the purposes specified in the Assignment of Leases, and
Lender assumes no duty, liability or obligation under the Lease, except only
under the circumstances, terms and conditions specifically set forth in the
Assignment of Leases or this Agreement.

     9.   NOTICE OF DEFAULT BY LESSOR - Tenant, as Lessee under the Lease,
hereby covenants and agrees to give Lender written notice properly specifying
wherein the Lessor under the Lease has failed to perform any of the covenants or
obligations of the Lessor under the Lease simultaneously with the giving of any
notice of such default to the Lessor under the provisions of the Lease. Tenant
agrees that Lender shall have the right, but not the obligation, within thirty
(30) days after receipt by Lender of such notice (or, with respect to
non-monetary defaults only, within such additional time as is reasonably
required to correct any such default) to correct or remedy, or cause to be
corrected or remedied, each such default before the Lessee under the Lease may
take any action under the Lease by reason of such default; provided, however, in
no event shall such time extend for more than sixty (60) days after Tenant
provides such notice to Lender, except if Lender has commenced to cure any such
non-monetary default under the Lease (which shall in no event include
foreclosure or exercise of other remedies available under the Mortgage) within
thirty (30) days after such written notice to Lender and is diligently
proceeding to cure such default and such non-monetary default cannot be cured
within sixty (60) days


                                       7
<PAGE>   109


despite such diligent efforts to cure on the part of Lender, in which event such
time period may be extended for such additional period as may be necessary to
complete the curing of such non-monetary default with diligence and continuity;
and provided further such cure period shall not affect the right of Tenant to
terminate the lease (i) under Section 2.4 of the Lease ("Early Termination
Opinion"), (ii) under Paragraph 3.2 of the Lease if the Leased Premises are not
deemed ready for occupancy by the "Outside Delivery Date" (as defined therein)
or (iii) in the event Lender has delivered to Tenant an Opt-Out Construction
Notice pursuant to Paragraph 4 above. Such notices to Lender shall be delivered
in duplicate in writing by registered or certified mail, return receipt
requested, or by depositing the same with an overnight commercial courier (such
as Federal Express) or by hand delivery to:

               Wells Fargo Bank, National Association
               121 High Street, 5th Floor
               Boston, MA 02110
               Attention: Kimberly A Dail

With copy to:  Wells Fargo Bank, National Association
               Real Estate Group
               420 Montgomery Street, Sixth Floor
               San Francisco, California 94111
               Attention: Chief Credit Officer - Real Estate Group

               and

               Wells Fargo Bank, National Association
               Real Estate Group
               Suite 420
               2020 K Street, N.W.
               Washington, D.C. 20006
               Attention: Manager, Loan Administration Department

or to such other address as the Lender shall have designated to Tenant by giving
written notice to Tenant at:

               RSA Security, Inc.
               20 Crosby Drive
               Bedford, Massachusetts  01730

With copy to:  Robert Tuchmann, Esq.
               Hall & Dorr LLP
               60 State Street
               Boston, Massachusetts  02109


or to such other address as may be designated by written notice from Tenant to
Lender.


                                       8
<PAGE>   110


     10.  NO FURTHER SUBORDINATION - Except as expressly provided to the
contrary in Paragraph 6 hereof, Landlord and Tenant covenant and agree with
Lender that there shall be no further subordination of the interest of Lessee
under the Lease to any lender or to any other party without first obtaining the
prior written consent of Lender. Any attempt to effect a further subordination
of Lessee's interest under the Lease without first obtaining the first written
consent of Lender shall be null and void.

     11.  CONSENT - Lender hereby consents to the Lease.

     12.  TRADE FIXTURES OR EQUIPMENT - The lien of the Mortgage does not
encumber any trade fixtures or equipment or other personal property used and
paid for by Tenant in its business on the Property.

     13.  AS TO LANDLORD AND TENANT - As between Landlord and Tenant, Landlord
and Tenant covenant and agree that nothing herein contained, nor anything done
pursuant to the provisions hereof, shall be deemed or construed to modify the
Lease.

     14.  AS TO LANDLORD AND LENDER - As between Landlord and Lender, Landlord
and Lender covenant and agree that nothing herein contained, nor anything done
pursuant to the provisions hereof, shall be deemed or construed to modify the
Mortgage or the Assignment of Leases.

     15.  TITLE OF PARAGRAPHS - The titles of the paragraphs of this agreement
are for convenience and reference only, and the words contained therein shall in
no way be held to explain, modify, amplify or aid in the interpretation,
construction or meaning of the provisions of this agreement.

     16.  GOVERNING, LAW - This agreement shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts.

     17.  PROVISIONS BINDING - The terms and provisions hereof shall be binding
upon and shall inure to the benefit of the heirs, executors, administrators,
successors and permitted assigns, respectively, of Lender, Tenant and Landlord.
The reference contained to successors and assigns of Tenant is not intended to
constitute and does not constitute a consent by Landlord or Lender to an
assignment by Tenant where such consent is required under the Lease, but has
reference only to those instances in which the Lessor under the Lease and Lender
shall have given written consent to a particular assignment by Tenant thereunder
where such consent is required under the Lease. In the event of a conflict
between the provisions of this Agreement and the provisions of the Lease, the
provisions of this Agreement shall prevail.

     In the event of any transfer of the Mortgage or the note secured thereby,
the Lender shall transfer and deliver to the transferee any security deposit
under the Lease held by Lender or its agent, and provided the transferee assumes
the obligations of Lender hereunder or otherwise recognizes the provisions
hereof by written instrument delivered to Tenant, Lender shall thereupon become
freed and relieved of all covenants and obligations of the Lender hereunder,
except with respect to any breaches of this Agreement as shall have theretofore
occurred.

     18.  COUNTERPARTS - This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same


                                       9
<PAGE>   111


instrument.

     19.  MODIFICATION - This Agreement may not be modified orally or in any
manner other than by an agreement in writing signed by the parties hereto or
their respective successors in interest.

     20.  INFORMATION. So long as the Loan is outstanding, Tenant covenants to
provide Lender with all information, including, but not limited to evidence of
payment of taxes and insurance (if Tenant is obligated for such payments under
the Lease) to which the Landlord may be entitled under the Lease.

     21.  INSPECTIONS. So long as the Loan is outstanding, Lender or its
designee may enter upon the Property at all reasonable times, upon reasonable
notice to Tenant, to visit or inspect the Property and discuss the affairs,
finances and accounts of Tenant applicable to the Property or the Lease at such
reasonable times as Lender or its designee may request.

     22.  ENFORCEABILITY. Each of Tenant, Landlord and Mortgagee hereby
represents and warrants that the Lease and this Agreement have been duly
authorized, executed and delivered by such party and constitute legal, valid and
binding instruments, enforceable against such party in accordance with their
respective terms, except as such terms may be limited by bankruptcy, insolvency
or similar laws affecting creditors' rights generally.

     IN WITNESS WHEREOF, the parties have executed this Agreement as an
instrument under seal and hereunto set their respective hands and seals as of
the day, month and year first above written.

                                        LENDER:

                                        WELLS FARGO BANK, NATIONAL ASSOCIATION


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                        TENANT:

                                        RSA SECURITY, INC.


                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------


                                       10
<PAGE>   112



                                        LANDLORD:

                                        BEDFORD WOODS LIMITED PARTNERSHIP I
---------------------------------------------------------------------------
                                        By: THE GUTIERREZ COMPANY,
------------------------------------------------------------------
                                               its general partner
------------------------------------------------------------------



                                        By:
                                            ------------------------------------
                                        Name:
                                               ---------------------------------
                                        Title:
                                               ---------------------------------


STATE OF
         -------------------------------

___________________________ County, SS                ____________________, 2000

Then personally appeared before me _______________, the _______________________
of WELLS FARGO BANK, NATIONAL ASSOCIATION, to me personally known, who I am
satisfied signed the foregoing instrument, and who did acknowledge under oath
that he/she signed and delivered the same in his/her capacity as
____________________, and that the foregoing instrument is his/her free act and
deed and the free act and deed of such WELLS FARGO BANK, NATIONAL ASSOCIATION.


                                        ________________________________________
                                        Notary Public
                                        My Commission Expires:


STATE OF
         -------------------------------

___________________________ County, SS                ____________________, 2000

Then personally appeared before me _______________, the ________________________
of RSA SECURITY, INC., to me personally known, who I am satisfied signed the
foregoing instrument, and who did acknowledge under oath that he/she signed and
delivered the same in his/her capacity as ____________________________, and that
the foregoing instrument is his/her free act and deed and the free act and deed
of such RSA SECURITY, INC.


                                        ________________________________________
                                        Notary Public
                                        My Commission Expires:


                                       11
<PAGE>   113


                                   EXHIBIT "L"

                         DEFINITION OF COST OF THE WORK


REIMBURSABLE COSTS:

The following 18 numbered items shall be used to determine and calculate the
Cost of the Work:


1.   The term Cost of the Work shall mean costs necessarily incurred and paid by
     the Contractor in the proper performance of the Work. Such costs shall be
     at rates not higher than the standard paid in the greater Boston area and
     shall include the items set forth below. The Contractor, as hereinafter
     defined, agrees to solicit bids from at least three (3) subcontractors on
     each major trade for all items costing more than $50,000.00. Landlord shall
     have the right to select the subcontractors to bid on the Tenant Work;
     however Tenant may propose qualified subcontractors to participate in the
     competitive bidding process, provided that any such subcontractors must be
     approved by Landlord in its reasonable judgment.

2.   Wages paid for labor in the direct employ of Gutierrez Construction Co.,
     Inc. ("Contractor") in the performance of the Work under applicable
     collective bargaining agreements, or under a salary or wage schedule agreed
     upon by the Landlord, and Contractor, and including such welfare or other
     benefits, if any, as may be payable with respect thereto.

3.   Salaries of Contractor's personnel when stationed at the field office, in
     whatever capacity employed, and a proportionate share of the project
     manager and construction managers' salaries, whether at the job site or in
     the main office. Personnel engaged at shops or on the road in expediting
     the production or transportation of materials or equipment shall be
     considered as stationed at the field office and their salaries paid for
     that portions of their time spent on the work.

4.   Cost of contributions, assessments or taxes incurred during the performance
     of the work for such items as unemployment compensation and social
     security, insofar as such cost is based on wages, salaries or other
     remuneration paid to employees of the Contractor and included in the Cost
     of the Work under subsections 2 and 3.

5.   Costs of all materials, supplies and equipment incorporated in the work,
     including costs of transportation thereof.

6.   Payments made by the Contractor to subcontractors for work performed
     pursuant to subcontracts.

7.   Cost, including transportation and maintenance, of all materials, supplies,
     equipment, temporary facilities and hand tools not owned by the workers,
     which are consumed in the performance of


<PAGE>   114


     the work, and cost less salvage value on such items used by not consumed
     which remain the property of the Contractor.

8.   Rental charges of all necessary machinery and equipment, exclusive of hand
     tools, used at the site in performance of the work, whether rented from the
     Contractor or others including installation, minor repairs and
     replacements, dismantling, removal, transportation and delivery costs
     thereof, at rental charges consistent with those prevailing in the greater
     Boston area.

9.   Cost of premiums for all bonds and insurance, which the Contractor is
     required by the construction contract or this Lease, to purchase and
     maintain.

10.  Sales, use, or similar taxes related to the work and for which the
     Contractor is liable, which are imposed by any governmental authority.

11.  Permit fees, royalties, damage or infringement of patents and costs of
     defending suits therefor, and deposits lost for causes other than due to
     the Contractor's negligence.

12.  Losses and expenses, not compensated by insurance or otherwise, sustained
     by the Contractor in connection with the work, provided they have resulted
     from causes other than the fault or neglect of the Contractor. Such losses
     shall include settlements made with the written consent and reasonable
     approval by Landlord and Tenant. If, however, such loss requires
     reconstruction and the Contractor is placed in charge thereof, he shall be
     paid for his services a fee of ten percent (10%) of the cost of such work.

13.  Minor expenses such as telegrams, long distance telephone calls, telephone
     service at the site, expressage, drawing reproduction, mail service,
     special deliveries, and similar petty cash items incurred in connection
     with the Tenant's Work.

14.  Cost of all removal of debris and clean up.

15.  Costs incurred due to an emergency affecting the safety of persons and
     property.

16.  Other costs incurred in the performance of the work if and to the extent
     approved in advance in writing by the Tenant.

17.  The cost of temporary power and heat.


<PAGE>   115


                                   EXHIBIT "M"

                              INTENTIONALLY DELETED


<PAGE>   116


                                   EXHIBIT "N"

                              INTENTIONALLY DELETED


<PAGE>   117


                                   EXHIBIT "O"
                               PREMISES EXPANSION

BUILDING 4 EXPANSION

Landlord is currently subject to limitation on the amount of square feet of R&D
space, which may be constructed in the park. Such limitation is imposed by
Massachusetts Secretary of Environmental Affairs (the "MEPA Limitation"). When
expanded to its full footprint as approved by the Bedford Planning Board's
Special Permit, Building No. 4 is planned as 140,012 square feet. Except as
otherwise provided in subparagraph (A) hereof, Landlord covenants that when
permitted by all federal, state, and local authorities, it will construct such
additional 28.232 square foot addition to Building No. 4 and lease it to Tenant,
subject to all of the other terms and conditions of this Lease and as specified
in this paragraph.

Landlord may elect to either: (i) erect such 28,232 square foot expansion (the
"Building No. 4 Expansion") at the same time as it erects the rest of the
Building containing the original 112,000 square foot "Original Premises" (if
allowed by federal, town, and state authorities), in which case, at such time as
Landlord is granted the permits to finish such space for Tenant's occupancy, and
received indications from the requisite authority that a Certificate of
Occupancy for such Building No. 4 Expansion Premises will be issued upon
completion of its tenant fit up, then Landlord will so notify Tenant, and within
twenty (20) days thereof, Tenant will select and hire "Tenant's Expansion
Architect" to prepare tenant fit up plans for such Building No. 4 Expansion
Premises. Such tenant plans will be completed expeditiously by the Tenant's
Expansion Architect but in no event later than one hundred (100) days after
Landlord's notice to Tenant of the availability of such Building No. 4 Expansion
Premises. Upon receipt of the tenant plans, Landlord will proceed to price such
plans and bid them all in accordance with Article III hereof. Landlord and
Tenant will negotiate in good faith to establish a completion date for the
construction of Tenant's work after Landlord has received complete plans for
such work; or (ii) alternatively, should Landlord not elect, or not be
permitted, to construct such Building No. 4 Expansion Premises at the same time
as the Original Premises, then Landlord covenants it will use good faith efforts
to obtain the permits required for the construction of such Building No. 4
Expansion Premises as soon as possible after the completion of the Original
Premises and, upon obtaining all such permits required for such construction,
shall notify Tenant as provided in the previous paragraph, and Tenant and
Landlord shall proceed, as provided in the previous paragraph, with tenant
plans, pricing, and construction.

Upon Substantial Completion of such Building No. 4 Expansion Premises, the Fixed
Rent under this Lease shall be increased to reflect the additional square
footage added to the Premises at the Fixed Rent per Square Foot Rates set forth
in this Exhibit "O".

Tenant will be granted the option to contribute up to Fifteen Dollars per square
foot ($15.00/SF) Four Hundred Twenty Three Thousand Eight Hundred Forty Dollars
($423,840.00) toward the Cost of Landlord's Work on such Building No. 4
Expansion. Such election to be made within thirty (30) days of Landlord's notice
to Tenant of its obtaining the required permits to finish or construct such
Building No. 4 Expansion. Should Tenant make such election, then the Fixed Rent
payable in each year of the Initial Term of this Lease for such Building No. 4
Expansion Premises shall be reduced by an annual amount equal to the amount so
contributed times (x) .108 per year during each year. But for such rent
reduction, the Fixed Rent payable hereunder during the Initial Term would be as
follows: Years 1


<PAGE>   118


through 3: $19.25 per square foot; Years 4 through 6: $21.25 per square foot;
Years 7 through 10: $24.25 per square foot; and Years 11 through 15: $28.25 per
square foot.

Any such Tenant Contribution toward the cost of Landlord's Work will be paid to
Landlord within fifteen (15) days of Substantial Completion of the Building No.
4 Expansion Premises. In order to guarantee Tenant's obligation to make such
Contribution toward the cost of Landlord's Work, Tenant shall provide a letter
of credit satisfactory to Landlord's construction mortgagee in the amount so
elected. After such election, failure to make such Contribution, or provide such
letter of credit, as specified herein shall be an event of default under this
Lease.

Notwithstanding Landlord's obligations as set forth in this Exhibit "O", in the
event that Landlord's mortgage lender institutes foreclosure proceedings and/or
becomes mortgagee in possession of the Building, then Landlord's Building No. 4
Expansion obligations hereunder shall be of no force and effect, and Landlord's
failure to comply with such obligations shall not constitute a default by
Landlord under the Lease until such time, if ever, as such foreclosure
proceedings and/or Landlord's lender's mortgagee in possession status shall
terminate and the immediate pre-foreclosure or pre-mortgagee in possession
Landlord again controls the Building. Further, should Landlord's lender or
anyone acquiring title to the property through it, either by deed in lieu of
foreclosure, foreclosure or otherwise, become Landlord, then such Building No. 4
Expansion Option shall terminate. In the event that Landlord or Landlord's
lender or anyone acquiring title to the property through it, either by deed in
lieu of foreclosure, foreclosure or otherwise, fail to complete the construction
of the Building No. 4 Expansion Premises then the Tenant shall have the right,
but not the obligation, to complete the construction of such Building No. 4
Expansion Premises, at Tenant's sole cost and expense, in compliance with all
other terms and provisions in this Lease, and the Landlord shall cooperate in
connection with such work including assigning and making available to Tenant all
plans, permits, surveys, tests, drawings and all other documents necessary or
appropriate in connection with such work.


                                       2
<PAGE>   119


                                   EXHIBIT "P"

                                   MARKET RENT


     The market rent for the Premises shall be the then fair market rent for
comparable leases completed in comparable office space located along and near
Route 3 and the Middlesex Turnpike between Route 128 and Route 495 in the Towns
of Bedford, Burlington, Billerica and Chelmsford, Massachusetts, taking into
account, but not limited to, rental rate, brokerage fees, lease term, base year,
tenant improvements, and leasing concessions offered to tenants in the
marketplace, which such rent (the "Market Rent") shall be determined as follows:

(a)  The Market Rent shall be proposed by Landlord within fifteen (15) days of
     receipt of Tenant's notice that it intends to exercise its option to extend
     the Term as specified in Exhibit F of this Lease hereof (the "Landlord's
     Proposed Market Rent"). The Landlord's Proposed Market Rent shall be the
     Market Rent unless Tenant notifies Landlord, within fifteen (15) days of
     Tenant's receipt of Landlord's Proposed Market Rent, that Landlord's
     Proposed Market Rent is not satisfactory to Tenant ("Tenant's Rejection
     Notice").

(b)  If Tenant delivers Tenant's Rejection Notice and the Market Rent is not
     otherwise agreed upon by Landlord and Tenant within forty-five (45) days
     after Landlord's receipt of Tenant's notice that it intends to exercise its
     option to extend the Term, then the Market Rent shall be determined by the
     following appraisal procedure:

     1.   Within five (5) days of the expiration of said forty-five (45) day
          period, Tenant shall give notice to Landlord, which notice shall
          specify the name and address of the commercial real estate broker
          designated by Tenant (the "Tenant's Appraisal Notice"). All such real
          estate brokers shall have at least ten (10) years experience in the
          Boston Real Estate Market. The last five (5) years of which is in the
          Suburban Boston office/R&D market. Landlord shall within five (5) days
          after receipt of Tenant's Appraisal Notice, notify Tenant of the name
          and address of the real estate broker designated by Landlord. Such two
          real estate brokers shall, within twenty (20) days after the
          designation of the second real estate broker, make their
          determinations of the Market Rent in writing and give notice thereof
          to each other and to Landlord and Tenant. Such two (2) real estate
          brokers shall have twenty (20) days after the receipt of notice of
          each other's determination to confer with each other and to attempt to
          reach agreement as to the determination of the Market Rent. If such
          real estate brokers shall concur in such determination, they shall
          give notice thereof to Landlord and Tenant and such concurrence shall
          be final and binding upon Landlord and Tenant. If such real estate
          brokers shall fail to concur as to such determination within said
          twenty (20) day period, they shall give notice thereof to Landlord and
          Tenant and shall immediately designate a third real estate broker. If
          the two real estate brokers shall fail to agree upon the designation
          of such third real estate broker within five (5) days after said
          twenty (20) day period, then they or either of them shall give notice
          of such failure to agree to Landlord and Tenant and if Landlord and
          Tenant fail to agree upon the selection of such third real estate
          broker within five (5) days after the real estate broker(s) appointed
          by the parties give notice as aforesaid, then either party on behalf
          of both may apply to the American Arbitration Association or any


<PAGE>   120


          successor thereto, or on his or her failure, refusal or inability to
          act, to a court of competent jurisdiction, for the designation of such
          third real estate broker.

     2.   All real estate brokers shall be independent real estate real estate
          brokers or consultants who shall have had at least fifteen (15) years
          continuous experience in the business of appraising real estate in
          said market.

     3.   The third real estate broker shall conduct such investigations as he
          or she may deem appropriate and shall, within ten (10) days after the
          date of his or her designation, make an independent determination of
          the Market Rent.

     4.   If none of the determinations of the real estate brokers varies from
          the mean of the determinations of the other real estate brokers by
          more than ten (10%) percent, the mean of the determinations of the
          three (3) real estate brokers shall be the Market Rent for the
          Premises. If, on the other hand, the determination of any single real
          estate broker varies from the mean of the determinations of the other
          two (2) real estate brokers by more than ten (10%) percent, the mean
          of the determination of the two (2) real estate brokers whose
          determinations are closest shall be the Market Rent.

     5.   The determination of the real estate brokers, as provided above, shall
          be conclusive upon the parties and shall have the same force and
          effect as a judgment made in a court of competent jurisdiction.

     6.   Each party shall pay fees, costs and expenses of the real estate
          broker selected by it, its own counsel fees, and one-half (1/2) of all
          other expenses and fees of any such appraisal.


                                       2
<PAGE>   121


                                   EXHIBIT "Q"
                              INTENTIONALLY DELETED


<PAGE>   122


                                   EXHIBIT "R"
                              INTENTIONALLY DELETED


<PAGE>   123


                                   EXHIBIT "S"

Bedford Woods - BUILDING NO. 4

                                    SCHEDULE
--------------------------------------------------------------------------------
                 (Assumes Lease signed not later than 11/14/00)


RELEASE TENANT ARCHITECT                                    (MARGULIES)
                                                                 10/20/00

BASE BUILDING DESIGN EXTERIOR PLUS                                     (3 weeks)

                                                                 10/3/00-
                                                                 10/20/00
     INTERIOR FLOOR PLANS ARCHITECTURE
     (BOTH BUILDINGS 3 AND 4)      (SMM)

TENANT PROGRAM DEVELOPMENT AND
                                                                 11/15/00
     ESTIMATE OF ROOFTOP MECHANICAL
     EQUIPMENT LOAD FOR STEEL STRUCTURAL
     DRAWINGS & BUILDING ELECTRICAL LOAD

CONSTRUCTION SITE PLANS
                                                                           (SMM)
                                                                       (4 weeks)
                                                                 10/9/00-11/8/00


BUILDING STRUCTURAL DRAWINGS, BUILDING
                                                                 10/27/00
     PERMIT, AND MILL ORDER SET         (PATTI)

SITE WORK FOR FOUNDATIONS
                                                                      (15 weeks)

                                                                 1/15/01-4/27/01
     (BALANCE SPRING AND SUMMER 2001)

BASE BUILDING MECHANICAL, ELECTRICAL,
                                                                 11/27/00
     PLUMBING FOR BUILDING PERMIT       (SMM)

SUBMIT PLANS TO BUILDING INSPECTOR FOR
                                                                 12/4/00
     BUILDING PERMIT                    (SMM)


<PAGE>   124


BUILDING INSPECTOR REVIEW & ISSUE PERMIT           (6 weeks ?)   12/4/00-1/12/01

STEEL AND PRECAST FABRICATION                                         (24 weeks)
                                                                 11/15/00-5/1/01
     (AFTER LEASE EXECUTION)

11.  COMPLETE BASE BUILDING PLANS INCLUDING
                                                                          1/8/01
     ALL PARTITIONS, ELECTRICAL, PLUMBING, ETC.
     (BOTH BUILDINGS 3 AND 4)              (SMM)

LOCATE ALL MAJOR TENANT ROOF & SLAB
                                                                          1/8/01
     PENETRATIONS (BOTH BUILDINGS 3 AND 4) (MARGULIES)

13.  COMPLETE TENANT PLANS
                                                                      (24 weeks)
                                                                10/16/00-3/30/01
     (BOTH BUILDINGS 3 AND 4)     (MARGULIES)

14.  STEEL AND PRECAST ERECTION PLUS ROOF                             (15 weeks)
                                                                 6/4/01-9/14/01
     AND WINDOWS

15.  FIRST FLOOR UNDERGROUND AND SLAB ?                                (4 weeks)
                                                                 7/16/01-8/10/01

16.  TENANT WORK
                                                                      (25 weeks)
                                                                 9/10/01-3/1/01
(START ABOVE CEILING BEFORE ROOF AND WINDOWS)


<PAGE>   125


                                   EXHIBIT "T"

                                 NOTICE OF LEASE


     In accordance with the provisions of Massachusetts General Laws (Ter. Ed.)
Chapter 183, Section 4, as amended, notice is hereby given of a certain lease
(hereinafter referred to as the "Lease") dated as of November ___, 2000 by and
between Bedford Woods Limited Partnership I ("Landlord") and RSA Security, Inc.
(hereinafter referred to as "Tenant").

                                   WITNESSETH:

     1.   The address of the Landlord is c/o The Gutierrez Company, One Wall
          Street, Burlington, Massachusetts 01803.

     2.   The address of the Tenant is 20 Crosby Drive, Bedford, Massachusetts
          01730 (prior to the Term Commencement Date) and Building 4, Bedford
          Woods, 176 Middlesex Turnpike, Bedford, Massachusetts 01730 (after the
          Term Commencement Date).

     3.   The Lease was executed on November __, 2000.

     4.   The Term of the Lease is a period of fifteen (15) years beginning on
          the Term Commencement Date determined in accordance with Section 3.2
          of the Lease, currently scheduled for March 2, 2002.

     5.   Subject to the provisions of the Lease, the Tenant has the option to
          extend the Term of the Lease for two (2) successive five (5) year
          terms pursuant to Exhibit "F" of the Lease.

     6.   The Tenant has the obligation to expand into the Building 4 Expansion
          Premises of an additional 28,232 rentable square feet at such time as
          Landlord obtains all required permits for such space, as set forth in
          Exhibit "O" to the Lease.

     7.   The Lot and the Park, as such terms are defined in the Lease, are
          subject to the covenants and agreements contained in Exhibit "I" of
          the Lease.

     8.   The demised premises is one hundred eleven thousand, seven hundred
          eighty (111,780) rentable square feet located within a four (4) story
          building containing approximately one hundred forty thousand twelve
          (140,012) rentable square feet located at 176 Middlesex Turnpike,
          4 Bedford Woods Drive, Bedford, Massachusetts 01730, and the areas of
          which are the subject of all appurtenant rights and easements set
          forth in Sections 2.1 and 10.14 of the Lease to be located on Lot 1-4
          as further described on Exhibit A-1 attached hereto.

     9.   The deed for the real estate of which the demised premises under the
          Lease is a part was recorded on __________________ with the Middlesex
          North Registry of Deeds in Book ________, Page _________, as more
          particularly described in Exhibit "A" attached hereto.


<PAGE>   126


     This Notice of Lease has been executed merely to give notice of the Lease,
and all of the terms, conditions and covenants of which are incorporated herein
by reference. The parties hereto do not intend this Notice of Lease to modify or
amend the terms, conditions and covenants of the Lease which are incorporated
herein by reference.

     IN WITNESS WHEREOF, the parties hereto have duly executed this Notice of
Lease this ___ day of November, 2000.

                                             LANDLORD:
                                             BEDFORD WOODS LIMITED
                                             PARTNERSHIP I

                                             BY THE GUTIERREZ COMPANY
                                             ITS GENERAL PARTNER

                                             BY:
                                             ITS:

                                             DATED:

                                             TENANT:
                                             RSA SECURITY, INC.


                                             By:
                                                 -------------------------------

                                             Its:
                                                  ------------------------------

                                             Dated:
                                                    ----------------------------


                                       2
<PAGE>   127


                          COMMONWEALTH OF MASSACHUSETTS

MIDDLESEX, SS.                                                ____________, 2000

     Then personally appeared before me , as trustee of and acknowledged the
foregoing instrument to be his free act and deed as trustee aforesaid.


                                             ___________________________________
                                             NOTARY PUBLIC
                                             My Commission Expires:


                                       3
<PAGE>   128


                          COMMONWEALTH OF MASSACHUSETTS

_______________, SS.                                          ____________, 2000


     Then personally appeared before me ________________, as ________________,
and acknowledged the foregoing instrument to be his/her free act and deed as
_________ aforesaid.


                                             ___________________________________
                                             NOTARY PUBLIC
                                             My Commission Expires:


                                       4
<PAGE>   129


                                  EXHIBIT "A-1"


     A certain parcel of land located on Middlesex Turnpike in the Bedford Woods
Office Park, Bedford, Massachusetts shown as Lot 1-4 on that certain plan
entitled "Plan of Land in Bedford, MA prepared for The Gutierrez Company"
prepared by Hancock Survey Associates, Inc. Scale 1" = 100' dated November 13,
2000 and to be recorded with the Middlesex South Registry of Deeds when executed
by the Town of Bedford, Massachusetts Planning Board. Said Lot 1-4 contains
approximately 25.58 acres according to said plan (a copy of which is attached
hereto and made a part hereof). Landlord and Tenant hereby acknowledge and agree
that this Exhibit A-1 shall be replaced by amendment to this Notice of Lease
upon creation of the Lot and recording of said plan. Landlord and Tenant agree
not to record this Notice of Lease until said plan is recorded in the Middlesex
South Registry of Deeds.