Document:

<PAGE>   1
                                                                   EXHIBIT 10.19

                               EXHIBIT 1, SHEET 1
                                 Two Apple Hill
                              598 Worcester Street
                              Natick, Massachusetts
                                (the "Building")

Execution Date:                  April 9, 1999

Tenant:                          Servicesoft Technologies, Inc.
                                          (name)

                                 a Delaware corporation
                                 (description of business organization)

                                 50 Cabot Street, Needham,
                                 Massachusetts 02194
                                 (principal place of business - mailing address)

Landlord:                        Metropolitan Life Insurance Company. Mailing
                                 Address: SSR Realty Advisors, Inc., One North
                                 Broadway, Suite 500, White Plains, New York
                                 10601, Attn: Director of Asset Management.
                                 Additional Notice Address: SSR Realty Advisors,
                                 Inc., One North Broadway, Suite 500, White
                                 Plains, New York 10601, Attn: Legal Department.

Building:                        The Building in the Town of Natick,
                                 Massachusetts, known as Two Apple Hill, located
                                 at 598 Worcester Street.

Art. 2   Premises:               An area on the third (3rd) floor of the
                                 Building, substantially as shown on Lease Plan,
                                 Exhibit 2

Art. 3.1  Specified Commencement Date: June 1, 1999

Art. 3.2  Termination Date: Five (5) years after the Term Commencement Date

Art. 4.3  Final Plans Date: April 15, 1999

Art. 5   Use of Premises:  General business offices

Art. 6   Yearly Rent:
<TABLE>
<CAPTION>
                Lease Year(1)               Yearly Rent                Monthly Payment

<S>                                        <C>                          <C>
                    1 - 3                   $662,500.08                  $55,208.34

                      4                     $687,500.04                  $57,291.67

                      5                     $700,000.08                  $58,333.34
</TABLE>

--------

1        For the purposes of this Lease, "Lease Year" shall be defined as any
         twelve-(12)-month period during the term of the Lease, commencing as of
         the Term Commencement Date, or as of any anniversary of the Term
         Commencement Date.
<PAGE>   2

                               EXHIBIT 1, SHEET 2
                                 Two Apple Hill
                              598 Worcester Street
                              Natick, Massachusetts
                                (the "Building")

                     Tenant: Servicesoft Technologies, Inc.
                          Execution Date: April 9, 1999

Art. 7       Total Rentable Area: Approximately 25,000 square feet

             Building Total Rentable Area:      125,000 square feet

Art. 8       Electric current will be furnished by Landlord to Tenant. In
             consideration of Landlord providing electric current to Tenant
             during the term of the Lease, in accordance with Article 8.1,
             Tenant shall pay to Landlord, as additional rent, at the same time
             and in the same manner as Yearly Rent is paid under the Lease,
             electricity rent ("Electricity Rent") in the initial amount of
             $31,250.04 per annum (i.e., a monthly payment of $2,604.17),
             subject to increase in accordance with Article 8.1(b).

Art. 9       Operating and Tax Escalation:

             Operating Costs in the Base Year:  The actual amount of Operating
                                                Costs for the first Lease Year

             Tax Base: The actual amount of Taxes for fiscal/tax year 2000
                       (i.e., July 1, 1999 - June 30, 2000)

             Tenant's Proportionate Share: Approximately 20.0%

Art. 29.3    Broker:         Lynch, Murphy, Walsh & Partners, Inc.

Art. 29.5    Arbitration:    Massachusetts, Superior Court

             Exhibit Dates: Lease Plan, Exhibit 2, dated April 9, 1999

LANDLORD:                                                     TENANT:
METROPOLITAN LIFE INSURANCE COMPANY         SERVICESOFT TECHNOLOGIES, INC.
On behalf of a co-mingled separate
account

By:      SSR Realty Advisors, Inc.,
         its Investment Advisor

By: : /s/ ILLEGIBLE                         By:  /s/ ILLEGIBLE
     -------------------------------           ---------------------------
         (Name) (Title)                        (Name) (title)
         Hereunto Duly Authorized              Hereunto Duly Authorized
         Date Signed:  4/23/99                 Date Signed:  4/15/99
                      ----------                            ---------------

JOHN F. LOEHR
MANAGING DIRECTOR
<PAGE>   3

                                    CONTENTS
<TABLE>
<S>                                                                             <C>
 1.     REFERENCE DATA.........................................................     1
 2.     DESCRIPTION OF PREMISES  ..............................................     1
 2.1    Demised Premises  .....................................................     1
 2.2    Appurtenant Rights  ...................................................     1
 2.3    Exclusions and Reservations  ..........................................     1
 3.     TERM OF LEASE
 3.1    Definitions............................................................     2
 3.2    Habendurn  ............................................................     2
 3.3    Declaration Fixing Term Commencement Date  ............................     2
 4.     READINESS FOR OCCUPANCY - ENTRY BY TENANT
        PRIOR TO TERM COMMENCEMENT DATE  ......................................     2
 4.1    Completion Date - Delays  .............................................     3
 4.2    When Premises Deemed Ready  ...........................................     3
 4.3    Plans and Specifications  .............................................     3
 4.4    Preparation of Premises  ..............................................     4
 4.5    Quality and Cost of Materials  ........................................     4
 4.6    Tenant's Delay - Additional Costs  ....................................     4
 4.7    Entry by Tenant Prior to Term Commencement Date  ......................     5
 4.8    Conclusiveness of Landlord's Performance  .............................     5
 4.9    Tenant Payments of Construction Cost  .................................     5
 5.     USE OF PREMISES  ......................................................     5
 5.1    Permitted Use  ........................................................     5
 5.2    Prohibited Uses  ......................................................     5
 5.3    Licenses and Permits  .................................................     6
 6.     RENT:  ................................................................     6
 7.     RENTABLE AREA - ADJUSTMENT OF RENT  ...................................     6
 8.     SERVICES FURNISHED BY LANDLORD  .......................................     6
 8.1    Electric Current.......................................................
 8.2    Water..................................................................
 8.3    Elevators, Heat, Cleaning  ............................................     7
 8.4    Air Conditioning  .....................................................     8
 8.5    Additional Heat, Cleaning and
        Air Conditioning Services  ............................................     8
 8.6    Additional Air Conditioning Equipment  ................................     8
 8.7    Repairs................................................................     9
 8.8    Interruption or Curtailment of Services  ..............................     9
 8.9    Energy Conservation  ..................................................     9
 8.10   Miscellaneous  ........................................................    10
 9.     ESCALATION  ...........................................................    10
 9.1    Definitions  ..........................................................    10
 9.2    Tax Excess  ...........................................................    13
 9.3    Operating Expense Excess  .............................................    13
 9.4    Part Years  ...........................................................    14
 9.5    Effect of Taking  .....................................................    14
 9.6    Adjustment of Operating Costs Base Upon Vacancy  ......................    14
 9.7    Survival  .............................................................    14
 10.    CHANGES OR ALTERATIONS BY LANDLORD  ...................................    14
 11.    FIXTURES, EQUIPMENT AND IMPROVEMENTS - REMOVAL BY TENANT  .............    15
 12.    ALTERATIONS AND IMPROVEMENTS BY TENANT  ...............................    15
 13.    TENANT'S CONTRACTORS - MECHANIC'S AND OTHER LIENS STANDARD OF
        TENANT'S PERFORMANCE - COMPLIANCE WITH LAWS ...........................    16
 14.    REPAIRS BY TENANT - FLOOR LOAD  .......................................    17
 14.1   Repairs by Tenant  ....................................................    17

</TABLE>
<PAGE>   4
<TABLE>

<S>                                                                              <C>
 14.2   Floor Load - Heavy Machinery  .........................................    17
 15.    INSURANCE, INDEMNIFICATION, EXONERATION AND EXCULPATION  ..............    17
 15.1   General Liability Insurance  ..........................................    17
 15.2   Certificates of Insurance  ............................................    17
 15.3   General................................................................    18
 15.4   Property of Tenant  ...................................................    18
 15.5   Bursting of Pipes, etc .  .............................................    19
 15.6   Repairs and Alterations - No Diminution  ..............................    19
        of Rental Value
 16.    ASSIGNMENT, MORTGAGING AND SUBLETTING  ................................    19
 17.    MISCELLANEOUS COVENANTS  ..............................................    22
 17.1   Rules and Regulations  ................................................    22
 17.2   Access to Premises - Shoring  .........................................    23
 17.3   Accidents to Sanitary and Other Systems  ..............................    23
 17.4   Signs, Blinds and Drapes  .............................................    24
 17.5   Estoppel Certificate  .................................................    24
 17.6   Prohibited Materials and Property  ....................................    24
 17.7   Requirements of Law - Fines and Penalties  ............................    25
 17.8   Tenant's Acts - Effect on Insurance  ..................................    25
 17.9   Miscellaneous  ........................................................    25
 18.    DAMAGE BY FIRE, ETC  ..................................................    25
 19.    WAIVER OF SUBROGATION  ................................................    26
 20.    CONDEMNATION - EMINENT DOMAIN  ........................................    27
 21.    DEFAULT  ..............................................................    28
 21.1   Conditions of Limitation - Re-entry - Termination....................      28
 21.2   Intentionally Omitted  ................................................    29
 21.3   Damages - Termination  ................................................    29
 21.4   Fees and Expenses  ....................................................    30
 21.5   Waiver of Redemption  .................................................    30
 21.6   Landlord's Remedies Not Exclusive  ....................................    30
 21.7   Grace Period  .........................................................    30
 22.    END OF TERM - ABANDONED PROPERTY  .....................................    31
 23.    SUBORDINATION  ........................................................    32
 24.    QUIET ENJOYMENT  ......................................................    33
 25.    ENTIRE AGREEMENT - WAIVER - SURRENDER  ................................    34
 25.1   Entire Agreement ......................................................    34
 25.2   Waiver by Landlord  ...................................................    34
 25.3   Surrender  . ..........................................................    34
 26.    INABILITY TO PERFORM - EXCULPATORY CLAUSE  ............................    34
 27.    BILLS AND NOTICES  ....................................................    35
 28.    PARTIES BOUND - SEIZING OF TITLE  .....................................    36
 29.    MISCELLANEOUS  ........................................................    36
 29.1   Separability  .........................................................    36
 29.2   Captions, etc.  .......................................................    36
 29.3   Broker  ...............................................................    36
 29.4   Modifications  ........................................................    36
 29.5   Arbitration  ..........................................................    36
 29.6   Governing Law  ........................................................    37
 29.7   Assignment of Rents  ..................................................    37
 29.8   Representation of Authority  ..........................................    37
 29.9   Expenses Incurred by Landlord Upon Tenant Requests  ...................    37
 29.10  Survival  .............................................................    38
</TABLE>
<PAGE>   5

EXHIBITS
Exhibit 2 Lease Plan
Exhibit 3 Building Standard Items
Exhibit 4 Building Services
Exhibit 5 Description of Landlord's Work
              Rider to Lease
<PAGE>   6
         THIS INDENTURE OF LEASE made and entered into on the Execution Date as
stated in Exhibit I and between the Landlord and the Tenant named in Exhibit 1.

Landlord does hereby demise and lease to Tenant, and Tenant does hereby hire and
take from Landlord, the premises hereinafter mentioned and described
(hereinafter referred to as "premises"), upon and subject to the covenants,
agreements, terms, provisions and conditions of this Lease for the term
hereinafter stated:

1.  REFERENCE DATA

         Each reference in this Lease to any of the terms and titles contained
in any Exhibit attached to this Lease shall be deemed and construed to
incorporate the data stated under that term or title in such Exhibit.

2.  DESCRIPTION OF DEMISED PREMISES

         2.1 Demised Premises. The premises are that portion of the Building as
described in Exhibit I (as the same may from time to time be constituted after
changes therein, additions thereto and eliminations therefrom pursuant to rights
of Landlord hereinafter reserved) and is hereinafter referred to as "Building",
substantially as shown hatched or outlined on the Lease Plan (Exhibit 2) hereto
attached and incorporated by reference as a part hereof

         2.2 Appurtenant Rights. Tenant shall have, as appurtenant to the
premises, rights to use in common, with others entitled thereto, subject to
reasonable rules from time to time made by Landlord of which Tenant is given
notice; (a) the common lobbies, hallways, stairways and elevators of the
Building, serving the premises in common with others, (b) common walkways
necessary for access to the Building, and (c) if the premises include less than
the entire rentable area of any floor, the common toilets and other common
facilities of such floor; and no other appurtenant rights or easements. Landlord
by the service provider of fees assessed by Landlord in its sole discretion.

         As of the Execution Date of this Lease, there are 3.5 parking spaces in
the surface parking lot and in the adjacent parking garage designated for use by
the tenants of the Building for every 1,000 square feet of Building Total
Rentable Area (as defined in Exhibit 1). Nothing contained in the Lease shall
prohibit or otherwise restrict Landlord from changing, from time to time,
following notice to Tenant, the location, layout or type of such parking areas,
provided that Landlord shall not, except as required by law or by takings,
reduce the number of parking spaces available for such tenants' use by more than
five (5%) percent. Subject to reasonable rules from time to time made by
Landlord of which Tenant is given at least ten (10) days prior written notice,
Tenant shall have the right, in common with all other tenants of the Building,
to use such parking areas, without charge, on a first-come first-served basis.
The parties acknowledge that Landlord shall have no obligation to Tenant to
police the use of said parking spaces; however, Landlord may implement systems,
as Landlord deems fit, to monitor the use of the surface parking lot.
<PAGE>   7
         2.3 Exclusions and Reservations. All the perimeter walls of the
premises except the inner surfaces thereof, any balconies (except to the extent
same are shown as part of the premises on the Lease Plan (Exhibit 2)), terraces
or roofs adjacent to the premises, and any space in or adjacent to the premises
used for shafts, stacks, pipes, conduits, wires and appurtenant fixtures, fan
rooms, ducts, electric or other utilities, sinks or other Building facilities,
and the use thereof, as well as the right of access through the premises for the
purposes of operation, maintenance, decoration and repair, are expressly
excluded from the premises and reserved to Landlord.

3.  TERM OF LEASE

         3.1 Definitions. As used in this Lease the words and terms which follow
mean and include the following:

             (a) "Specified Commencement Date" - The date (as stated in Exhibit
1) on which it is estimated that the premises will be ready for Tenant's
occupancy for its use as stated in Exhibit 1.

             (b) "Term Commencement Date" - The "Term Commencement Date" is the
date on which the premises are ready for Tenant's occupancy (as defined in
Article 4.2) for use as set forth in Exhibit 1. If the premises are not ready
for such occupancy but if, pursuant to permission therefor duly given by
Landlord, Tenant takes possession of the whole or any part of the premises for
use as set forth in Exhibit 1, "Term Commencement Date" shall be the date on
which Tenant takes such possession.

         3.2 Habendum. TO HAVE AND TO HOLD the premises for a term of years
commencing on the Term Commencement Date and ending on the Termination Date as
stated in Exhibit I or on such earlier date upon which said term may expire or
be terminated pursuant to any of the conditions of limitation or other
provisions of this Lease or pursuant to law (which date for the termination of
the terms hereof will hereafter be called "Termination Date"). Notwithstanding
the foregoing, if the Termination Date as stated in Exhibit I shall fall on
other than the last day of a calendar month, said Termination Date shall, at the
option of Landlord, be deemed to be the last day of the calendar month in which
said Termination Date occurs.

         3.3 Declaration Fixing Term Commencement Date. As soon as may be after
the execution date hereof, each of the parties hereto agrees, upon demand of the
other party to join in the execution, in recordable form, of a statutory notice,
memorandum, etc. of lease and/or written declaration in which shall be stated
such Term Commencement Date and (if need be) the Termination Date. If this Lease
is terminated before the term expires, then upon Landlord's request the parties
shall execute, deliver and record an instrument acknowledging such fact and the
date of termination of this Lease.

         4. READINESS FOR OCCUPANCY - ENTRY BY TENANT PRIOR TO TERM COMMENCEMENT
DATE

         4.1 Completion Date - Delays.
<PAGE>   8
         A. Subject to delay by causes beyond the reasonable control of Landlord
or caused by the action or inaction of Tenant, Landlord shall use reasonable
speed and diligence in the construction of the Building and to have the premises
ready for Tenant's occupancy on the Specified Commencement Date. The failure to
have the premises ready for Tenant's occupancy on the Specified Commencement
Date shall in no way affect the validity of this Lease or the obligations of
Tenant hereunder nor shall the same be construed in any way to extend the term
of this Lease. If the premises are not ready for Tenant's occupancy within the
meaning of Article 4.2 hereof on the Specified Commencement Date, Tenant shall
not have any claim against Landlord, and Landlord shall have no liability to
Tenant, by reason thereof.

         B. Notwithstanding the foregoing, if the Term Commencement Date shall
not have occurred on or before August 1, 1999 for any reason, then Tenant shall
have the right, exercisable by a written thirty (30) day termination notice
given on or after August 1, 1999, to terminate the Lease. If the Term
Commencement Date occurs on or before the thirtieth (30th) day after Landlord
receives such termination notice, Tenant's termination notice shall be deemed to
be void and of no force or effect. If the Term Commencement Date does not occur
on or before the thirtieth (30th) day after Landlord receives such termination
notice, then Landlord shall promptly to return to Tenant any payments paid by
Tenant to Landlord pursuant to this Lease, and this Lease shall be void and
without further force or effect.

         4.2 When Premises Deemed Ready. A. The premises shall be conclusively
deemed ready for Tenant's occupancy as soon as Landlord's Work, as defined in
Paragraph B of this Article 4.2 has been substantially completed by Landlord,
and the elevator, plumbing, air conditioning and electric facilities are
initially substantially available to Tenant, in accordance with the obligations
assumed by Landlord hereunder and Landlord has delivered to Tenant a certificate
of occupancy. Notwithstanding the foregoing, if Tenant engages its own
contractors to perform any portion of the work to be performed in the initial
preparation of the premises, Landlord shall be relieved of its responsibility
for obtaining such partial certificate of occupancy to the extent that
Landlord's failure to obtain such certificate of occupancy is based upon any
aspect of the work performed by Tenant's contractors. Such facilities shall not
be deemed to be unavailable if only minor or insubstantial details of
construction, decoration or mechanical adjustments remain to be done. The
premises shall not be deemed to be unready for Tenant's occupancy or incomplete
if only minor or insubstantial details of construction, decoration or mechanical
adjustments remain to be done in the premises or any part thereof, or if the
delay in the availability of the premises for occupancy could not reasonably
have been avoided by Landlord (provided however, that Landlord shall not be
required to incur additional expense in order to avoid delays caused by Tenant)
and is (i) due to special work, changes, alterations or additions required or
made by Tenant in the layout or finish of the premises or any part thereof, (ii)
caused in whole or in part by Tenant through the delay of Tenant in submitting
any plans and/or specifications, supplying information, approving plans,
specifications or estimates, giving authorizations or otherwise or (iii) caused
in whole or in part by delay and/or default on the part of Tenant or its
contractors including, without
<PAGE>   9
limitation, the utility companies and other entities furnishing communications,
data processing or other service or equipment. If the premises are deemed ready
for Tenant's occupancy, pursuant to the foregoing, (and the term shall have
commenced by reason thereof), but the premises are not in fact actually ready
for Tenant's occupancy, Tenant shall not (except with Landlord's consent) be
entitled to take possession of the premises for use as set forth in Exhibit 1
until the premises are in fact actually ready for such occupancy. Landlord's
architect's certificate of substantial completion, as hereinabove stated, given
in good faith, or of any other facts pertinent to this Article 4.2 shall be
deemed conclusive of the statements therein contained and binding upon Tenant.
Any of Landlord's work in the premises not fully completed on the Term
Commencement Date shall thereafter be so completed with reasonable diligence by
Landlord.

         B. Landlord shall, at Landlord's cost, perform the work ("Landlord's
Work") necessary to construct the premises substantially in accordance with the
plans and specifications referenced on Exhibit 5 (and with Tenant's final
approved plans which shall be consistent with the plans and specifications
referenced on Exhibit 5).

         C. Landlord shall contribute up to Thirty-One Thousand Two Hundred
Fifty and 00/100 ($31,250.00) Dollars ("Landlord's Contribution") towards
architectural and engineering fees in the preparation of Tenant's plans. Tenant
shall, within thirty (30) days of billing therefor, reimburse Landlord for all
costs of architectural and engineering fees in excess of Landlord's
Contribution. Tenant shall not be entitled to any unused portion of Landlord's
Contribution.

         4.3 Plans and Specifications. Tenant shall be solely responsible for
the timely preparation and submission to Landlord of the final architectural,
electrical and mechanical construction drawings, plans and specifications
(called "plans") necessary to construct the premises for Tenant's occupancy,
which plans shall be subject to approval by Landlord's architect and engineers
and shall comply with their requirements to avoid aesthetic or other conflicts
with the design and function of the balance of the Building, Landlord's approval
is solely given for the benefit of Landlord and neither Tenant nor any third
party shall have the right to rely upon Landlord's approval of Tenant's plans
for any purpose whatsoever. Without limiting the foregoing, Tenant shall be
responsible for all elements of the design of Tenant's plans (including, without
limitation, compliance with law, functionality of design, the structural
integrity of the design, the configuration of the premises and the placement of
Tenant's furniture, appliances and equipment), and Landlord's approval of
Tenant's plans shall in no event relieve Tenant of the responsibility for such
design. Tenant agrees to remain solely responsible for the timely preparation
and submission of all such plans and for all elements of the design of such
plans, except for Landlord's Contribution, and for all costs related thereto.
Tenant has assured itself by direct communication with the architect and
engineers (Landlord's or its own, as the case may be) that the final approved
plans can be delivered to Landlord on or before the Final Plans Date as stated
in Exhibit 1, provided that Tenant promptly furnishes complete information
concerning its requirements to said architect and engineers as and when
requested by them; and Tenant covenants
<PAGE>   10
and agrees to cause said final, approved plans and specifications to be
delivered to Landlord on or before said Final Plans Date and to devote such time
as may be necessary in consultation with said architect and engineers to enable
them to complete and submit all plans within the required time limit. Time is of
the essence in respect of preparation and submission of plans by Tenant. (The
word "architect" as used in this Article 4 shall include an interior designer or
space planner.)

         4.4 Preparation of Premises.

         (a) By Landlord. Except as is otherwise herein provided or as may be
otherwise approved by the Landlord, all work necessary to prepare the premises
for Tenant's occupancy, including work to be performed at Tenant's expense,
shall be performed by contractors employed by Landlord.

         (b) By Tenant. Subject always to the provisions of Articles 4.2 and
4.3, if Tenant engages any contractors in preparing the premises for Tenant's
occupancy, Landlord will give Tenant reasonable advance notice (at least two (2)
weeks) of the date on which the premises will be ready for such other
contractors and a reasonable time will be allowed from such date for doing the
work to be performed by such other contractors.

         (c) If any work, including but not by way of limitation, installation
of built-in equipment by the manufacturer or distributor thereof, shall be
performed by contractors not employed by Landlord, Tenant shall take necessary
reasonable measures to the end that such contractor shall cooperate in all ways
with Landlord's contractors to avoid any delay to the work being performed by
Landlord's contractors or conflict in any other way with the performance of such
work.

         4.5 Quality and Cost of Materials. Any construction or finish of
previously constructed premises, whether by Landlord or Tenant, shall equal or
exceed the specifications and quantities provided in Exhibit 3. Except for
Landlord's Contribution, Tenant shall bear all costs of preparing the premises
for its occupancy in accordance with the final plans.

         4.6 Tenants Delay - Additional Costs. If Tenant fails or omits to make
timely submission to Landlord of the layout and plans referred to in Article
4.3, or other pertinent information, or delays in submitting any other plans or
specifications, or in supplying information, or in approving plans,
specifications or estimates, or in giving authorizations or fails to comply with
Section 4.4(c) hereof, or otherwise fails to honor or perform its obligations
under this Lease, any additional cost to Landlord in connection with the
completion of the premises in accordance with the terms of this Lease and
Exhibit 3 shall be promptly paid by Tenant to Landlord if such additional cost
is in whole or in part the result of such failure, omission or delay of Tenant.
For the purposes of the next preceding sentence, the expression "additional cost
to Landlord" shall mean the cost over and above such cost as would have been the
aggregate cost to Landlord of completing the premises in accordance with the
terms of this Lease and Exhibit 3 had there been no such failure, omission or
delay. Nothing contained in this Article 4.6 shall limit or qualify or prejudice
any other covenants, agreements, terms, provisions and conditions contained in
this Lease, including, but not limited to Article 4.2.
<PAGE>   11
         4.7 Entry by Tenant Prior to Term Commencement Date. With Landlord's
prior written consent, which shall not be unreasonably withheld, Tenant shall
have the right to enter the premises at least two weeks prior to the Term
Commencement Date, during normal business hours and without payment of rent, to
perform such work or decoration as is to be performed by, or under the direction
or control of, Tenant and as is otherwise in compliance with the terms of this
Lease. Such right of entry shall be deemed a license from Landlord to Tenant,
and any entry thereunder shall be at the risk of Tenant.

         4.8 Conclusiveness of Landlord's Performance. Tenant shall be
conclusively deemed to have agreed that Landlord has performed all of its
obligations under this Article 4 unless not later than the end of the second
calendar month next beginning after the Term Commencement Date Tenant shall give
Landlord written notice specifying the respects in which Landlord has not
performed any such obligation.

         4.9 Tenant Payments of Construction Cost. Landlord shall have the same
rights and remedies which Landlord has upon the nonpayment of Yearly Rent and
other charges due under this Lease for nonpayment of any amounts which Tenant is
required to pay to Landlord or Landlord's contractor in connection with the
construction and initial preparation of the premises (including, without
limitation, any amounts which Tenant is required to pay in accordance with
Articles 4.5 and 4.6 hereof) or in connection with any construction in the
premises performed for Tenant by Landlord, Landlord's contractor or any other
person, firm or entity after the Term Commencement Date.

5.  USE OF PREMISES

         5.1 Permitted Use. Tenant shall continuously during the term hereof
occupy and use the premises only for the purposes as stated in Exhibit 1 and for
no other purposes. Service and utility areas (whether or not a part of the
premises) shall be used only for the particular purpose for which they were
designed. Without limiting the generality of the foregoing, Tenant agrees that
it shall not use the premises or any part thereof, or permit the premises or any
part thereof to be used for the preparation or dispensing of food, whether by
vending machines or otherwise. Notwithstanding the foregoing, but subject to the
other terms and provisions of this Lease, Tenant may, with Landlord's prior
written consent, which consent shall not be unreasonably withheld, install at
its own cost and expense so-called hot-cold water fountains, coffee makers and
so-called Dwyer refrigerator-sink-stove combinations for the preparation of
beverages and foods, provided that no cooking, frying, etc., are carried on in
the premises to such extent as requires special exhaust venting, Tenant hereby
acknowledging that the Building is not engineered to provide any such special
venting.

         5.2 Prohibited Uses. Notwithstanding any other provision of this Lease,
Tenant shall not use, or suffer or permit the use or occupancy of, or suffer or
permit anything to be done in or anything to be brought into or kept in or about
the premises or the Building or any part thereof (including, without limitation,
any materials appliances or equipment used in the construction or other
preparation of the premises and furniture and
<PAGE>   12
carpeting): (i) which would violate any of the covenants, agreements, terms,
provisions and conditions of this Lease or otherwise applicable to or binding
upon the premises; (ii) for any unlawful purposes or in any unlawful manner;
(iii) which, in the reasonable judgment of Landlord shall in any way (a) impair
the appearance or reputation of the Building; or (b) impair, interfere with or
otherwise diminish the quality of any of the Building services or the proper and
economic heating, cleaning, ventilating, air conditioning or other servicing of
the Building; or premises, or with the use or occupancy of any of the other
areas of the Building, or occasion discomfort, inconvenience or annoyance, or
injury or damage to any occupants of the premises or other tenants or occupants
of the Building; or (iv) which is inconsistent with the maintenance of the
Building as an office building of the first class in the quality of its
maintenance, use, or occupancy. Tenant shall not install or use any electrical
or other equipment of any kind which, in the reasonable judgment of Landlord,
might cause any such impairment, interference, discomfort, inconvenience,
annoyance or injury.

         5.3 Licenses and Permits. If any governmental license or permit shall
be required for the proper and lawful conduct of Tenant's business, and if the
failure to secure such license or permit would in any way affect Landlord, the
premises, the Building or Tenant's ability to perform any of its obligations
under this Lease, Tenant, at Tenant's expense, shall duly procure and thereafter
maintain such license and submit the same to inspection by Landlord. Tenant, at
Tenant's expense, shall at all times comply with the terms and conditions of
each such license or permit. Tenant shall furnish all data and information to
governmental authorities and Landlord as required in accordance with legal,
regulatory, licensing or other similar requirements as they relate to Tenant's
use or occupancy of the premises or the Building.

6.  RENT

         During the term of this Lease the Yearly Rent and other charges, at the
rate stated in Exhibit 1, shall be payable by Tenant to Landlord by monthly
payments, as stated in Exhibit 1, in advance and without demand on the first day
of each month for and in respect of such month. The rent and other charges
reserved and covenanted to be paid under this Lease shall commence on the Term
Commencement Date. Notwithstanding the provisions of the next preceding
sentence, Tenant shall pay the first monthly installment of rent on the
execution of this Lease. If, by reason of any provisions of this Lease, the rent
reserved hereunder shall commence or terminate on any day other than the first
day of a calendar month, the rent for such calendar month shall be prorated. The
rent shall be payable to Landlord or, if Landlord shall so direct in writing, to
Landlord's agent or nominee, in lawful money of the United States which shall be
legal tender for payment of all debts and dues, public and private, at the time
of payment, at the office of the Landlord or such place as Landlord may
designate, and the rent and other charges in all circumstances shall be payable
without any setoff or deduction whatsoever. Rental and any other sums due
hereunder not paid on or before the date due shall bear interest for each month
or fraction thereof from the due date until paid computed at the annual rate of
five percentage points over the so-called prime rate then currently from time to
time charged to its most favored corporate customers by the largest
<PAGE>   13

national bank (N.A.) located in the city in which the Building is located, or at
any applicable lesser maximum legally permissible rate for debts of this nature.

7.  TOTAL RENTABLE AREA

         Total Rentable Area of the premises and of the Building have been
agreed, by the parties, to be the amounts set forth on Exhibit 1.

8.  SERVICES FURNISHED BY LANDLORD

         8.1  Electric Current.

             (a) As stated in Exhibit 1, Landlord will provide electric current
to the premises for the purposes of serving plugs and lights within the premises
("Premises Electric Current"). In consideration for Landlord's agreement to
provide such Premises Electric Current, Tenant shall pay to Landlord, as
additional rent, Electricity Rent, as defined on Exhibit 1. electricity Rent
shall be payable on the first day of each month in advance.

             (b) If, in the reasonable judgment of either party, the cost of
Premises Electric Current differs from the amount set forth on Exhibit 1, then
the amount of Electricity Rent shall be adjusted based upon the actual cost to
Landlord of providing Premises Electric Current. Either party may exercise its
rights under this Article 8.1 (b) by giving written notice ("Electric Charge
Dispute Notice") to the other party. If the parties have not resolved such
dispute within thirty (30) days after the giving of an Electric Charge Dispute
Notice, then such dispute shall be submitted to arbitration in accordance with
Article 29.5 of the Lease. Commencing as of the date ("Electric Rent Adjustment
Date") which is the date that the parties agree in writing upon a revised amount
of Electric Rent or date that the arbitrator renders his decision, Electricity
Rent shall thereafter be adjusted until and unless either party again exercises
its rights under this Article 8.1(b). The decision of the arbitrator shall, in
no event, be deemed to adjust the amount of Electricity Rent payable prior to
the Electric Rent Adjustment Date in question.

             (c) If Tenant installs any equipment in the premises which consumes
any electric current in excess of Building standard consumption, as reasonably
determined by Landlord, then Tenant shall pay for the cost of such excess
consumption. At Landlord's election, such cost may be determined by a submeter
installed and maintained by Landlord at Tenant's costs and expense or on the
basis of a reasonable engineering estimate from a reputable engineering firm.

             (d) If Tenant shall require electric current for use in the
premises in excess of such reasonable quantity to be furnished for such use as
hereinabove provided and if (i) in Landlord's reasonable judgment, Landlord's
facilities are inadequate for such excess requirements or (ii) such excess use
shall result in an additional burden on the Building air conditioning system and
additional cost to Landlord on account thereof then, as the case may be, (x)
Landlord upon written request and at the sole cost and expense of Tenant, will
furnish and install such additional wire, conduits, feeders, switchboards and
appurtenances as reasonably may be
<PAGE>   14
required to supply such additional requirements of Tenant if current therefor be
available to Landlord, provided that the same shall be permitted by applicable
laws and insurance regulations and shall not cause damage to the Building or the
premises or cause or create a dangerous or hazardous condition or entail
excessive or unreasonable alterations or repairs or interfere with or disturb
other tenants or occupants of the Building or (y) Tenant shall reimburse
Landlord for such additional cost, as aforesaid.

             (e) Landlord, at Tenant's expense and upon Tenant's request, shall
purchase and install all replacement lamps of types generally commercially
available (including, but not limited to, incandescent and fluorescent) used in
the premises.

             (f) Subject to Article 8.8, Landlord shall not in any way be liable
or responsible to Tenant for any loss, damage or expense which Tenant may
sustain or incur if the quantity, character, or supply of electrical energy is
changed or is no longer available or suitable for Tenant's requirements.

             (g) Tenant agrees that it will not make any material alteration or
material addition to the electrical equipment and/or appliances in the premises
without the prior written consent of Landlord in each instance first obtained,
which consent will not be unreasonably withheld, and will promptly advise
Landlord of any other alteration or addition to such electrical equipment and/or
appliances.

         8.2 Water. Landlord shall furnish hot and cold water for ordinary
premises, cleaning, toilet, lavatory and drinking purposes. If Tenant requires,
uses or consumes water for any purpose other than for the aforementioned
purposes, Landlord may (i) assess a reasonable charge for the additional water
so used or consumed by Tenant or (ii) install a water meter and thereby measure
Tenant's water consumption for all purposes. In the latter event, Landlord shall
pay the cost of the meter and the cost of installation thereof and shall keep
said meter and installation equipment in good working order and repair. Tenant
agrees to pay for water consumed, as shown on said meter, together with the
sewer charge based on said meter charges, as and when bills are rendered, and on
default in making such payment Landlord may pay such charges and collect the
same from Tenant. All piping and other equipment and facilities for use of water
outside the building core will be installed and maintained by Landlord at
Tenant's sole cost and expense.

         8.3  Elevators, Heat, Cleaning.

             (a) Landlord at its expense shall: (i) provide necessary elevator
facilities (which may be manually or automatically operated, either or both, as
Landlord may from time to time elect) on Mondays through Fridays, excepting
legal holidays, from 8:00 a.m. to 6:00 p.m. and on Saturdays, excepting legal
holidays, from 8:00 a.m. to 1:00 p.m. (called "business days") and have one
elevator in operation available for Tenant's use, non-exclusively, together with
others having business in the Building, at all other times; (ii) furnish heat
(substantially equivalent to that being furnished in comparably aged similarly
equipped office buildings in the
<PAGE>   15
same city) to the premises during the normal heating season oil business days;
and (iii) cause the office areas of the premises to be cleaned on business days
(except on Saturdays) provided the same are kept in order by Tenant. Exhibit 4
shall represent substantially the extent and scope of the cleaning by Landlord
referred to in this Article 8.3.

             (b) The parties agree and acknowledge that, despite reasonable
precautions in selecting cleaning and maintenance contractors and personnel, any
property or equipment in the premises of a delicate, fragile or vulnerable
nature may nevertheless be damaged in the course of cleaning and maintenance
services being performed. Accordingly, Tenant shall take reasonable protective
precautions with such property and equipment (including, without limitation,
computers or other data processing components or equipment and optical or
electronic equipment, etc.), e.g., housing the property and equipment in a
separate, locked room, so as to render it inaccessible to the Building's
cleaning personnel.

         8.4 Air Conditioning. Landlord shall through the air conditioning
equipment of the Building furnish to and distribute in the premises air
conditioning as normal seasonal changes may require on business days during the
hours as aforesaid in Article 8.3 when air conditioning may reasonably be
required for the comfortable occupancy of the premises by Tenant. Tenant agrees
to lower and close the blinds or drapes when necessary because of the sun's
position, whenever the air conditioning, system is in operation, and to
cooperate fully with Landlord with regard to, and to abide by all the reasonable
regulations and requirements which Landlord may prescribe for the proper
functioning and protection of the air conditioning system. The air conditioning
system referred to in this Article 8.4 shall be capable of maintaining a
temperature range that is reasonably standard for buildings of similar class,
size, age and location.

         8.5 Additional Heat, Cleaning and Air Conditioning Services.

             (a) Landlord will use reasonable efforts upon reasonable advance
written notice from Tenant of its requirements in that regard, to furnish
additional heat, cleaning or air conditioning services to the premises on days
and at times other than as above provided.

             (b) Tenant will pay to Landlord a reasonable charge (i) for any
such additional heat, cleaning or air conditioning service required by Tenant,
(ii) for any extra cleaning of the premises required because of the carelessness
or indifference of Tenant or because of the nature of Tenant's business, and
(iii) for any cleaning done at the request of Tenant of any portions of the
premises which may be used for storage, shipping room or other non-office
purposes. As of the Term Commencement Date, the charge for overtime heating and
air-conditioning services is Forty and 00/100 ($40.00) Dollars per hour. Such
charge may be increased by Landlord, from time to time, based upon actual
increases in the cost of providing such overtime service. Such charge may be
increased by Landlord, from time to time, based upon actual increases in the
cost of providing such overtime service. If the cost to Landlord for cleaning
the premises shall be increased due to the installation in the premises, at
Tenant's request, of any materials or finish other than those which are building
standard, Tenant shall pay to Landlord an amount equal to such increase in cost.
<PAGE>   16
         8.6 Additional Air Conditioning Equipment. In the event Tenant requires
additional air conditioning for business machines, meeting rooms or other
special purposes, or because of occupancy or excess electrical loads, any
additional air conditioning units, chillers, condensers, compressors, ducts,
piping and other equipment, such additional air conditioning equipment will be
installed and maintained by Landlord at Tenant's sole cost and expense, but only
if, in Landlord's reasonable judgment, the same will not cause damage or injury
to the Building or create a dangerous or hazardous condition or entail excessive
or unreasonable alterations, repairs or expense or interfere with or disturb
other tenants; and Tenant shall reimburse Landlord in such an amount as will
compensate it for the cost incurred by it in operating, such additional air
conditioning equipment.

         8.7 Repairs. Except as otherwise provided in Articles 18 and 20, and
subject to Tenant's obligations in Article 14, Landlord shall keep and maintain
the roof, exterior walls, structural floor stabs, columns, elevators, public
stairways and corridors, lavatories, equipment (including, without limitation,
sanitary, electrical, heating, air conditioning, or other systems) and other
common facilities of the Building in good condition and repair.

         8.8  Interruption or Curtailment of Services.

             A. When necessary by reason of accident or emergency, or for
repairs, alterations, replacements or improvements which in the reasonable
judgment of Landlord are desirable or necessary to be made, or of difficulty or
inability in securing supplies or labor, or of strikes, or of any other cause
beyond the reasonable control of Landlord, whether such other cause be similar
or dissimilar to those hereinabove specifically mentioned until said cause has
been removed, Landlord reserves the right to interrupt, curtail, stop or suspend
(i) the furnishing of heating, elevator, air conditioning, and cleaning services
and (ii) the operation of the plumbing and electric systems. Landlord shall
exercise reasonable diligence to eliminate the cause of any such interruption,
curtailment, stoppage or suspension, but there shall be no diminution or
abatement of rent or other compensation due from Landlord to Tenant hereunder,
nor shall this Lease be affected or any of the Tenant's obligations hereunder
reduced, and the Landlord shall have no responsibility or liability for any such
interruption, curtailment, stoppage, or suspension of services or systems.
Notwithstanding anything to the contrary in the Lease contained, Landlord
agrees, that, in exercising any right which Landlord has to enter the premises
and in performance of any work by Landlord in the Building, Landlord shall use
reasonable efforts to minimize any interference with Tenant's use of the
premises.

             B. Notwithstanding anything to the contrary in this Lease
contained, if the premises shall lack any service including electric current
which Landlord is required to provide hereunder (thereby rendering the premises
or a portion thereof untenantable) so that, for the Landlord Service
Interruption Cure Period, as hereinafter defined, the continued operation in the
ordinary course of Tenant's business is materially adversely affected and if
Tenant ceases to use the affected portion of the premises during the period of
untenantability as the direct result of such lack of
<PAGE>   17
service, then, provided that Tenant ceases to use the affected portion of the
premises during the entirety of the Landlord Service Interruption Cure Period
and that such untenantability and Landlord's inability to cure such condition is
not caused by the fault or neglect of Tenant or Tenants agents, employees or
contractors, or as the result of other costs beyond Landlord's reasonable
control (See Article 26) Yearly Rent, Operating Expense Excess, Tax Excess, and
Electricity Rent shall thereafter be abated in proportion to such
untenantability until the day such condition is completely corrected. For the
purposes hereof, the "Landlord Service Interruption Cure Period" shall be
defined as three (3) consecutive business days after Landlord's receipt of
written notice from Tenant of the condition causing untenantability in the
premises.

             C. The provisions of Paragraph B of this Article 8.8 shall not
apply in the event of untenantability caused by fire or other casualty, or
taking (see Articles 18 and 20).

         8.9 Energy Conservation. Notwithstanding anything to the contrary in
this Article 8 or in this Lease contained, Landlord may institute, and Tenant
shall comply with, such policies, programs and measures as may be necessary,
required, or expedient for the conservation and/or preservation of energy or
energy services, or as may be necessary or required to comply with applicable
codes, rules regulations or standards.

         8.10 Miscellaneous. Other than air conditioning, all services provided
by Landlord to Tenant are based upon an assumed maximum premises population of
one person per two hundred (200) square feet of Total Rentable Area, which limit
Tenant shall in no event exceed.

9.  ESCALATION

         9.1 Definitions. As used in this Article 9, the words and terms which
follow mean and include the following:

             (a) "Operating Year" shall mean a calendar year in which occurs any
part of the term of this Lease.

             (b) "Operating Costs in the Base Year" shall be the amount as
stated in Exhibit 1.

             (c) "Tenant's Proportionate Share" shall be the figure as stated in
Exhibit 1.

             (d) "Taxes" shall mean the real estate taxes and other taxes,
levies and assessments imposed upon the Building and the land on which it stands
and upon any personal property of Landlord used in the operation thereof, or
Landlord's interest in the Building or such personal property; charges, fees and
assessments for transit, housing, police, fire or other governmental services or
purported benefits to the Building; service or user payments in lieu of taxes;
and any and all other taxes, levies, betterments, assessments and charges
arising from the ownership, leasing, operating, use or occupancy of the Building
or based upon rentals derived therefrom, which are or shall be imposed by
National, State, Municipal or other authorities. As of the Execution Date,
"Taxes" shall not include any franchise, rental, income or profit tax, capital
levy or excise, provided,
<PAGE>   18
however, that any of the same and any other tax, excise, fee, levy, charge or
assessment, however described, that may in the future be levied or assessed as a
substitute for or an addition to, in whole or in part, any tax, levy or
assessment which would otherwise constitute "Taxes," whether or not now
customary or in the contemplation of the parties on the Execution Date of this
Lease, shall constitute "Taxes," but only to the extent calculated as if the
Building and the land upon which it stands is the only real estate owned by
Landlord. "Taxes" shall also include expenses of tax abatement or other
proceedings contesting assessments or levies.

             (e) "Tax Base" shall be the amount stated in Exhibit 1 and shall
apply to a Tax Period of twelve (12) months. Tax Base shall be reduced pro rata
if and to the extent that the Tax Period contains fewer than twelve (12) months.

             (f) "Tax Period" shall be any fiscal/tax period in respect of which
Taxes are due and payable to the appropriate governmental taxing authority, any
portion of which period occurs during the term of this Lease, the first such
Period being the one in which the Term Commencement Date occurs.

             (g) "Operating Costs".

                    (1) Definition of Operating Costs. "Operating Costs" shall
mean all costs incurred and expenditures of whatever nature made by Landlord in
the operation and management, for repair and replacements, cleaning and
maintenance of the Building and grounds including, without limitation, vehicular
and pedestrian passageways related to the Building (but excluding those areas,
if any, outside the Building, and for which operating expenses are chargeable to
non-office (i.e., commercial) tenants), related equipment, facilities and
appurtenances, elevators, cooling and heating equipment. In the event that
Landlord or Landlord's managers or agents perform services for the benefit of
the Building off-site which would otherwise be performed on-site (e.g.,
accounting), the cost of such services shall be reasonably allocated among the
properties benefiting from such service and shall be included in Operating
Costs. Operating Costs shall include, without limitation, those categories of
"Specifically Included Operating Costs," as set forth below, but shall not
include "Excluded Costs," as hereinafter defined.

                     (2) Definition of Excluded Costs. "Excluded Costs" shall be
defined as mortgage charges, brokerage commissions, salaries of executives and
owners not directly employed in the management/operation of the Building, the
cost of work done by Landlord for a particular tenant for which Landlord has the
right to be reimbursed by such Tenant, and, subject to Subparagraph (3) below,
such portion of expenditures as are not property chargeable against income.

                     (3) Capital Expenditures.

                            (i) Replacements. If, during the term of this Lease,
Landlord shall replace any capital items or make any capital expenditures
(collectively called "capital expenditures") the total amount of which is not
properly includible in Operating Costs for the Operating Year in which
<PAGE>   19
they were made, there shall nevertheless be included in such Operating Costs and
in Operating Costs for each succeeding Operating Year the amount, if any, by
which the Annual Charge-Off (determined as hereinafter provided) of such capital
expenditure (less insurance proceeds, if any, collected by Landlord by reason of
damage to, or destruction of the capital item being replace) exceeds the Annual
Charge-Off of the capital expenditure for the item being replaced.

                            (ii) New Capital Items. If a new capital item is
acquired which does not replace another capital item which was worn out, has
become obsolete, etc., then there shall be included in Operating Costs for each
Operating Year in which and after such capital expenditure is made the Annual
Charge-Off of such capital expenditure. Notwithstanding anything to the contrary
herein contained, with respect to a new (i.e. as opposed to replacement) capital
expenditure, such capital expenditure shall be included in Operating Costs only
if:

                                  1. the new capital item being acquired is
required by law which first becomes applicable after the Term Commencement Date,
or

                                  2. the new capital item is reasonably
projected to reduce Operating Costs.

                          (iii) Annual Charge-Off. "Annual Charge-Off" shall be
defined as the annual amount of principal and interest payments which would be
required to repay a loan ("Capital Loan") in equal monthly installments over the
Useful Life, as hereinafter defined, of the capital item in question on a direct
reduction basis at an annual interest rate equal to the Capital Interest Rate,
as hereinafter defined, where the initial principal balance is the cost of the
capital item in question. Notwithstanding the foregoing, if Landlord reasonably
concludes on the basis of engineering estimates that a particular capital
expenditure will effect savings in Building operating expenses including,
without limitation, energy related costs, and that such projected savings will,
on an annual basis ("Projected Annual Savings"), exceed the Annual Charge-Off of
such capital expenditure computed as aforesaid, then and in such events, the
Annual Charge-Off shall be increased to an amount equal to the Projected Annual
Savings; and in such circumstances, the increased Annual Charge-Off (in the
amount of the Projected Annual Savings) shall be made for such period of time as
it would take to fully amortize the cost of the capital item in question,
together with interest thereon at the Capital Interest Rate as aforesaid, in
equal monthly payments, each in the amount of one-twelfth (1/12th) of the
Projected Annual Savings, with such payments being applied first to interest and
the balance to principal.

                          (iv) Useful Life. "Useful Life" shall be reasonably
determined by Landlord in accordance with generally accepted accounting
principles and practices in effect at the time of acquisition of the capital
item.

                          (v) Capital Interest Rate. "Capital Interest Rate"
shall be defined as an annual rate of either one percentage point over the AA
Bond rate (Standard & Poor's corporate composite or, if unavailable, its
equivalent) as reported in the financial press at the time the capital
<PAGE>   20
expenditure is made or, if the capital item is acquired through third-party
financing, then the actual (including fluctuating) rate paid by Landlord in
financing the acquisition of such capital item.

                  (4) Specifically Included Categories of Operating Costs.
Operating Costs shall include, but not be limited to, the following:

                  Taxes (other than real estate taxes): Sales, Federal Social
Security, Unemployment and Old Age Taxes and contributions and State
Unemployment taxes and contributions accruing to and paid by the Landlord on
account of all employees of Landlord and/or Landlord's managing agent, who are
employed in, about or on account of the Building, except that taxes levied upon
the net income of the Landlord and taxes withheld from employees, and "Taxes" as
defined in Article 9. 1 (d) shall not be included herein.

                  Water: All charges and rates connected with water supplied to
the Building and related sewer use charges.

                  Heat and Air Conditioning: All charges connected with heat and
air conditioning supplied to the Building.

                  Wages: Wages and cost of all employee benefits of all
employees of the Landlord and/or Landlord's managing agent who are employed in,
about or on account of the Building.

                  Cleaning: The cost of labor and material for cleaning the
Building, surrounding areaways and windows in the Building.

                  Elevator Maintenance: All expenses for or on account of the
upkeep and maintenance of all elevators in the Building.

                  Electricity: The cost of all electric current for the
operation of any machine, appliance or device used for the operation of the
premises and the Building, including the cost of electric current for the
elevators, lights, air conditioning and heating, but not including electric
current which is paid for directly to the utility by the user/tenant in the
Building. (If and so long as Tenant is billed directly by the electric utility
for its own consumption as determined by its separate meter, then Operating
Costs shall include only Building and public area electric current consumption
and not any demised premises electric current consumption. Wherever separate
metering is unlawful, prohibited by utility company regulation or tariff or is
otherwise impracticable, relevant consumption figures for the purposes of this
Article 9 shall be determined by fair and reasonable allocations and engineering
estimates made by Landlord. Furthermore, if and to the extent that the
Operating-Costs-in-the-Base-Year figure shall include any component representing
the cost to the Landlord of electric current supplied to any tenant's premises
under so-called "rent-inclusion" lease arrangements, then if such cost is
eliminated from Operating Costs in an Operating Year in accordance with the
foregoing provisions, the figure for Operating Costs in the Base Year for the
purposes of this Article 9 shall likewise be reduced by the amount for such cost
component.)
<PAGE>   21
         Insurance, etc.: Fire, casualty, liability, rent loss and such other
insurance as may from time to time be required by lending institutions on
first-class office buildings in the City or Town wherein the Building is located
and all other expenses customarily incurred in connection with the operation and
maintenance of first-class office buildings in the City or Town wherein the
Building is located including, without limitation, insurance deductible amounts
and rental costs associated with the Building's management office.

         9.2 Tax Excess. If in any Tax Period the Taxes exceed the Tax Base,
Tenant shall pay to Landlord Tenant's Proportionate Share of such excess, such
amount being hereinafter referred to as "Tax Excess". Tax Excess shall be due
when billed by Landlord. In implementation and not in limitation of the
foregoing, Tenant shall remit to Landlord pro rata monthly installments on
account of projected Tax Excess, calculated by Landlord on the basis of the most
recent Tax data or budget available. If the total of such monthly remittances on
account of any Tax Period is greater than the actual Tax Excess for such Tax
Period, Tenant may credit the difference against the next installment of rental
or other charges due to Landlord hereunder. If the total of such remittances is
less than the actual Tax Excess for such Tax Period, Tenant shall pay the
difference to Landlord when billed therefor.

         If, in the exercise of Landlord's bona fide business judgment, Landlord
determines that the amount of Taxes for any Tax Period is excessive, Landlord
shall initiate and prosecute such proceedings as are necessary to obtain an
abatement or reduction of Taxes for such Tax Period. Appropriate credit against
Tax Excess shall be given for any refund obtained by reason of a reduction in
any Taxes by the Assessors or the administrative, judicial or other governmental
agency responsible therefor. The original computations, as well as reimbursement
or payments of additional charges, if any, or allowances, if any, under the
provisions of this Article 9.2 shall be based on the original assessed
valuations with adjustments to be made at a later date when the tax refund, if
any, shall be paid to Landlord by the taxing authorities. Expenditures for legal
fees and for other similar or dissimilar expenses incurred in obtaining the tax
refund may be charged against the tax refund before the adjustments are made for
the Tax Period.

         9.3 Operating Expense Excess. If the Operating Costs in any Operating
Year exceed the Operating Costs in the Base Year, Tenant shall pay to Landlord
Tenant's Proportionate Share of such excess, such amount being hereinafter
referred to as "Operating Expense Excess." Operating Expense Excess shall be due
when billed by Landlord. In implementation and not in limitation of the
foregoing, Tenant shall remit to Landlord pro rata monthly installments on
account of projected Operating Expense Excess, calculated by Landlord on the
basis of the most recent Operating Costs data or budget available. If the total
of such monthly remittances on account of any Operating Year is greater than the
actual Operating Expense Excess for such Operating Year, Tenant may credit the
difference against the next installment of rent or other charges due to Landlord
hereunder. If the total of such remittances is less than actual Operating
Expense Excess for such Operating Year, Tenant shall pay the difference to
Landlord when billed therefor.
<PAGE>   22
         9.4 Part Years. If the Term Commencement Date or the Termination Date
occurs in the middle of an Operating Year or Tax Period, Tenant shall be liable
for only that portion of the Operating Expense or Tax Excess, as the case may
be, in respect of such Operating Year or Tax Period represented by a fraction
the numerator of which is the number of days of the herein term which falls
within the Operating Year or Tax Period and the denominator of which is three
hundred sixty-five (365), or the number of days in said Tax Period, as the case
may be.

         9.5 Effect of Taking. In the event of any taking of the Building or the
land upon which it stands under circumstances whereby this Lease shall not
terminate under the provisions of Article 20 then, for the purposes of
determining Tax Excess, there shall be substituted for the Tax Base originally
provided for herein a fraction of such Tax Base, the numerator of which fraction
shall be the Taxes for the first Tax Period subsequent to the condemnation or
taking which takes into account such condemnation or taking, and the denominator
of which shall be the Taxes for the last Tax Period prior to the condemnation or
taking, which did not take into account such condemnation or taking. Tenant's
Proportionate Share shall be adjusted appropriately to reflect the proportion of
the premises and/or the Building remaining after such taking.

         9.6 Adjustment of Operating Costs Based Upon Vacancy. If the Building
is not at least ninety-five percent (95%) occupied during any Operating Year
(including the Base Year) or if Landlord is not supplying services to at least
ninety-five percent (95%) of the Total Rentable Area of the Building at any time
during any Operating Year, actual Operating Costs for such Operating Year for
purposes hereof shall be determined as if the Building had been ninety-five
percent (95%) occupied and Landlord had been supplying services to ninety-five
percent (95%) of the Total Rentable Area of the Building during such year. Any
necessary extrapolation of Operating Costs under this Article 9 shall be
performed by adjusting the cost of those components of Operating Costs that are
impacted by changes in the occupancy of the Building to the cost that would have
been incurred if the Building had been ninety-five percent (95%) occupied and
Landlord had been supplying services to ninety-five percent (95%) of the Total
Rentable Area of the Building.

         9.7 Survival. Any obligations under this Article 9 which shall not have
been paid at the expiration or sooner termination of the term of this Lease
shall survive such expiration and shall be paid when and as the amount of same
shall be determined to be due.

10. CHANGES OR ALTERATIONS BY LANDLORD

         Landlord reserves the right, exercisable by itself or its nominee, at
any time and from time to time without the same constituting an actual or
constructive eviction and without incurring any liability to Tenant therefor or
otherwise affecting Tenant's obligations under this Lease, to make such changes,
alterations, additions, improvements, repairs or replacements in or to the
Building (including the premises) and the fixtures and equipment thereof, as
well as in or to the street entrances, halls, passages, elevators, escalators,
and stairways thereof, as it may deem necessary or desirable, and to change the
arrangement and/or location
<PAGE>   23
of entrances or passageways, doors and doorways, and corridors, elevators,
stairs, toilets, or other public parts of the Building, provided, however, that
there be no unreasonable obstruction of the right of access to, or unreasonable
interference with the use and enjoyment of, the premises by Tenant. Nothing
contained in this Article 10 shall be deemed to relieve Tenant of any duty,
obligation or liability of Tenant with respect to making any repair, replacement
or improvement or complying with any law, order or requirement of any
governmental or other authority. Landlord reserves the right to adopt and at any
time and from time to time to change the name or address of the Building.
Neither this Lease nor any use by Tenant shall give Tenant any right or easement
for the use of any door or any passage or any concourse connecting with any
other building or to any public convenience, and the use of such doors, passages
and concourses and of such conveniences may be regulated or discontinued at any
time and from time to time by Landlord without notice to Tenant and without
affecting the obligation of Tenant hereunder or incurring any liability to
Tenant therefor, provided, however, that there be no unreasonable obstruction of
the right of access to, or unreasonable interference with the use of the
premises by Tenant.

         If at any time any windows of the premises are temporarily closed or
darkened for any reason whatsoever including but not limited to, Landlord's own
acts, Landlord shall not be liable for any damage Tenant may sustain thereby and
Tenant shall not be entitled to any compensation therefor nor abatements of rent
nor shall the same release Tenant from its obligations hereunder nor constitute
an eviction.

11. FIXTURES, EQUIPMENT AND IMPROVEMENTS--REMOVAL BY TENANT

         All fixtures, equipment, improvements and appurtenances attached to or
built into the premises prior to or during the term, whether by Landlord at its
expense or at the expense of Tenant (either or both) or by Tenant shall be and
remain part of the premises and shall not be removed by Tenant during or at the
end of the term unless Landlord otherwise elects to require Tenant to remove
such fixtures, equipment, improvements and appurtenances, in accordance with
Articles 12 and/or 22 of the Lease. All electric, telephone, telegraph,
communication, radio, plumbing, heating and sprinkling systems, fixtures and
outlets, vaults, paneling, molding, shelving, radiator enclosures, cork, rubber,
linoleum and composition floors, ventilating, silencing, air conditioning and
cooling equipment, shall be deemed to be included in such fixtures, equipment,
improvements and appurtenances, whether or not attached to or built into the
premises. Where not built into the premises, all removable electric fixtures,
carpets, drinking or tap water facilities, furniture, or trade fixtures or
business equipment or Tenant's inventory or stock in trade shall not be deemed
to be included in such fixtures, equipment, improvements and appurtenances and
may be, and upon the request of Landlord will be, removed by Tenant upon the
condition that such removal shall not materially damage the premises or the
Building and that the cost of repairing any damage to the premises or the
Building arising from installation or such removal shall be paid by Tenant.

12. ALTERATIONS AND IMPROVEMENTS BY TENANT
<PAGE>   24
         Tenant shall make no alterations, decorations, installations, removals,
additions or improvements in or to the premises without Landlord's prior written
consent and then only those (i) which equal or exceed the specifications and
quantities provided in Exhibit 3, and (ii) made by contractors or mechanics
approved by Landlord. No installations or work shall be undertaken or begun by
Tenant until: (i) Landlord has approved written plans and specifications and a
time schedule for such work; (ii) Tenant has made provision for either written
waivers of liens from all contractors, laborers and suppliers of materials for
such installations or work, the filing of lien bonds on behalf of such
contractors, laborers and suppliers, or other appropriate protective measures
approved by Landlord; and (iii) Tenant has procured appropriate surety payment
and performance bonds. No amendments or additions to such plans and
specifications shall be made without the prior written consent of Landlord.
Landlord's consent and approval required under this Article 12 shall not be
unreasonably withheld. Landlord's approval is solely given for the benefit of
Landlord and neither Tenant nor any third party shall have the right to rely
upon Landlord's approval of Tenant's plans for any purpose whatsoever. Without
limiting the foregoing, Tenant shall be responsible for all elements of the
design of Tenant's plans (including, without limitation, compliance with law,
functionality of design, the structural integrity of the design, the
configuration of the premises and the placement of Tenant's furniture,
appliances and equipment), and Landlord's approval of Tenant's plans shall in no
event relieve Tenant of the responsibility for such design. Landlord shall have
no liability or responsibility for any claim, injury or damage alleged to have
been caused by the particular materials, whether building standard or
non-building standard, appliances or equipment selected by Tenant in connection
with any work performed by or on behalf of Tenant in the premises including,
without limitation, furniture, carpeting, copiers, laser printers, computers and
refrigerators. Any such work, alterations, decorations, installations, removals,
additions and improvements shall be done at Tenant's sole expense and at such
times and in such manner as Landlord may from time to time designate. If Tenant
shall make any alterations, decorations, installations, removals, additions or
improvements then Landlord may elect to require the Tenant at the expiration or
sooner termination of the term of this Lease to restore the premises to
substantially the same condition as existed at the Term Commencement Date.
Tenant shall pay, as an additional charge, the entire increase in real estate
taxes on the Building which shall, at any time prior to or after the Term
Commencement Date, result from or be attributable to any alteration, addition or
improvement to the premises made by or for the account of Tenant in excess of
the specifications and quantities provided in Exhibit 3.

13. TENANT'S CONTRACTORS-MECHANICS' AND OTHER LIENS-STANDARD OF TENANT'S
PERFORMANCE-COMPLIANCE WITH LAWS

         Whenever Tenant shall make any alterations, decorations, installations,
removals, additions or improvements in or to the premises--whether such work be
done prior to or after the Term Commencement Date--Tenant will strictly observe
the following covenants and agreements:

               (a) Tenant agrees that it will not, either directly or
indirectly, use any contractors and/or materials if their use will create
<PAGE>   25
any difficulty, whether in the nature of a labor dispute or otherwise, with
other contractors and/or labor engaged by Tenant or Landlord or others in the
construction, maintenance and/or operation of the Building or any part thereof.

               (b) In no event shall any material or equipment be incorporated
in or added to the premises, so as to become a fixture or otherwise a part of
the Building, in connection with any such alteration, decoration, installation,
addition or improvement which is subject to any lien, charge, mortgage or other
encumbrance of any kind whatsoever or is subject to any security interest or any
form of title retention agreement. No installations or work shall be undertaken
or begun by Tenant until (i) Tenant has made provision for written waiver of
liens from all contractors, laborers and suppliers of materials for such
installations or work, and taken other appropriate protective measures approved
by Landlord; and (ii) Tenant has procured appropriate surety payment and
performance bonds which shall name Landlord as an additional obligee and has
filed lien bond(s) (in jurisdictions where available) on behalf of such
contractors, laborers and suppliers.

               (c) Any mechanic's lien filed against the premises or the
Building for work claimed to have been done for, or materials claimed to have
been furnished to, Tenant shall be discharged by Tenant within ten (10) days
thereafter, at Tenant's expense by filing the bond required by law or otherwise.
If Tenant fails so to discharge any lien, Landlord may do so at Tenant's expense
and Tenant shall reimburse Landlord for any expense or cost incurred by Landlord
in so doing within fifteen (15) days after rendition of a bill therefor.

               (d) All installations or work done by Tenant shall be at its own
expense and shall at all times comply with (i) laws, rules, orders and
regulations of governmental authorities having jurisdiction thereof; (ii)
orders, rules and regulations of any Board of Fire Underwriters, or any other
body hereafter constituted exercising similar functions, and governing insurance
rating bureaus; (iii) Rules and Regulations of Landlord; and (iv) plans and
specifications prepared by and at the expense of Tenant theretofore submitted to
and approved by Landlord.

               (e) Tenant shall procure all necessary permits before undertaking
any work in the premises; do all of such work in a good and workmanlike manner,
employing materials of good quality and complying with all governmental
requirements; and defend, save harmless, exonerate and indemnify Landlord from
all injury, loss or damage to any person or property occasioned by or growing
out of such work. Tenant shall cause contractors employed by Tenant to carry
Worker's Compensation Insurance in accordance with statutory requirements,
Automobile Liability Insurance and, naming Landlord as an additional insured,
Commercial General Liability Insurance covering such contractors on or about the
premises in the amounts stated in Article 15 hereof or in such other reasonable
amounts as Landlord shall require and to submit certificates evidencing such
coverage to Landlord prior to the commencement of such work.

14. REPAIRS BY TENANT--FLOOR LOAD
<PAGE>   26

         14.1 Repairs by Tenant. Tenant shall keep all and singular the premises
neat and clean (including periodic rug shampoo and waxing of tiled floors and
cleaning of blinds and drapes) and in such repair, order and condition as the
same are in on the Term Commencement Date or may be put in during the term
hereof, reasonable use and wearing thereof and damage by fire or by other
casualty excepted. Tenant shall be solely responsible for the proper maintenance
of all equipment and appliances operated by Tenant, including, without
limitation, copiers, laser printers, computers and refrigerators. Tenant shall
make, as and when needed as a result of misuse by, or neglect or improper
conduct of, Tenant or Tenant's servants, employees, agents, contractors,
invitees, or licensees or otherwise, all repairs in and about the premises
necessary to preserve them in such repair, order and condition, which repairs
shall be in quality and class equal to the original work. Landlord may elect, at
the expense of Tenant, to make any such repairs or to repair any damage or
injury to the Building or the premises caused by moving property of Tenant in or
out of the Building, or by installation or removal of furniture or other
property, or by misuse by, or neglect, or improper conduct of, Tenant or
Tenant's servants, employees, agents, contractors, or licensees.

         14.2 Floor Load--Heavy Machinery. Tenant shall not place a load upon
any floor of the premises exceeding the floor load per square foot of area which
such floor was designed to carry and which is allowed by law. Landlord reserves
the right to prescribe the weight and position of all business machines and
mechanical equipment, including safes, which shall be placed so as to distribute
the weight. Business machines and mechanical equipment shall be placed and
maintained by Tenant at Tenant's expense in settings sufficient in Landlord's
judgment to absorb and prevent vibration, noise and annoyance. Tenant shall not
move any safe, heavy machinery, heavy equipment, freight, bulky matter, or
fixtures into or out of the Building without Landlord's prior written consent.
If such safe, machinery, equipment, freight, bulky matter or fixtures requires
special handling, Tenant agrees to employ only persons holding a Master Rigger's
License to do said work, and that all work in connection therewith shall comply
with applicable laws and regulations. Any such moving shall be at the sole risk
and hazard of Tenant and Tenant will defend, indemnify and save Landlord
harmless against and from any liability, loss, injury, claim or suit resulting
directly or indirectly from such moving. Proper placement of all such business
machines, etc., in the premises shall be Tenant's responsibility.

15. INSURANCE, INDEMNIFICATION, EXONERATION AND EXCULPATION

         15.1 General Liability Insurance. Tenant shall procure, and keep in
force and pay for Commercial General Liability Insurance insuring Tenant on an
occurrence basis against all claims and demands for personal injury liability
(including, without limitation, bodily injury, sickness, disease, and death) or
damage to property which may be claimed to have occurred from and after the time
Tenant and/or its contractors enter the premises in accordance with Article 4 of
this Lease, of not less than Two Million ($2,000,000) Dollars in the event of
personal injury to any number of persons or damage to property, arising out of
any one occurrence, and from time to time thereafter shall be not less than such
higher amounts, if procurable, as may be reasonably required by Landlord and are
customarily
<PAGE>   27
carried by responsible similar tenants in the City or Town wherein the Building
is located.

         15.2 Certificates of Insurance. Such insurance shall be effected with
insurers approved by Landlord, authorized to do business in the State wherein
the Building is situated under valid and enforceable policies wherein Tenant
names Landlord and Landlord's managing agent as additional insureds. Such
insurance shall provide that it shall not be canceled or modified without at
least thirty (30) days' prior written notice to each insured named therein. On
or before the time Tenant and/or its contractors enter the premises in
accordance with Articles 4 and 14 of this Lease and thereafter not less than
fifteen (15) days prior to the expiration date of each expiring policy, original
copies of the policies provided for in Article 15.1 issued by the respective
insurers, or certificates of such policies setting forth in full the provisions
thereof and issued by such insurers together with evidence satisfactory to
Landlord of the payment of all premiums for such policies, shall be delivered by
Tenant to Landlord and certificates as aforesaid of such policies shall upon
request of Landlord, be delivered by Tenant to the holder of any mortgage
affecting the premises.

         15.3 General. Tenant will save Landlord, its agents and employees,
harmless and will exonerate, defend and indemnify Landlord, its agents and
employees, from and against any and all claims, liabilities or penalties
asserted by or on behalf of any person, firm, corporation or public authority
arising from the Tenant's breach of the Lease or:

               (a) On account of or based upon any injury to person, or loss of
or damage to property, sustained or occurring on the premises on account of or
based upon the act, omission, fault, negligence or misconduct of any person
whomsoever (except to the extent the same is caused by Landlord, its agents,
contractors or employees or by a trespasser);

               (b) On account of or based upon any injury to person, or loss of
or damage to property, sustained or occurring elsewhere (other than on the
premises) in or about the Building, (and, in particular, without limiting the
generality of the foregoing, on or about the elevators, stairways, public
corridors, sidewalks, concourses, arcades, malls, galleries, vehicular tunnels,
approaches, areaways, roof, or other appurtenances and facilities used in
connection with the Building, or premises) arising out of the negligent or
wrongful use or occupancy of the Building or premises by the Tenant, or by any
person claiming by, through or under Tenant, or on account of or based upon the
act, omission, fault, negligence or misconduct of Tenant, its agents, employees
or contractors; and

               (c) On account of or based upon a breach by Tenant in its
obligations under Article 13 (c).

               (d) Tenant's obligations under this Article 15.3 shall be insured
either under the Commercial General Liability Insurance required under Article
15.1, above, or by a contractual insurance rider or other coverage; and
certificates of insurance in respect thereof shall be provided by Tenant to
Landlord upon request.
<PAGE>   28
         15.4 Property of Tenant. In addition to and not in limitation of the
foregoing Tenant covenants and agrees that, to the maximum extent permitted by
law, all merchandise, furniture, fixtures and property of every kind, nature and
description related or arising out of Tenant's leasehold estate hereunder, which
may be in or upon the premises or Building, in the public corridors, or on the
sidewalks, areaways and approaches adjacent thereto, shall be at the sole risk
and hazard of Tenant, and that if the whole or any part thereof shall be
damaged, destroyed, stolen or removed from any cause or reason whatsoever no
part of said damage or loss shall be charged to, or borne by, Landlord; unless,
subject to Article 19 hereof, such damage or loss is due to the negligence or
willful misconduct of Landlord or Landlord's agents, employees or contractors,
in which case Landlord shall bear loss or damage only to "ordinary office
property" (as hereinafter defined). For the purpose of this Article 15.4,
"ordinary office property" shall mean merchandise, furniture, and other tangible
personal property of the kind and quantity which may customarily be expected to
be found within comparable business offices in the greater Boston area, and
excluding any unusually valuable or exotic property, works of art, and the like.

         15.5 Bursting of Pipes, etc. Landlord shall not be liable for any
injury or damage to persons or property resulting from fire, explosion, falling
plaster, steam gas air contaminants or emissions, electricity, electrical or
electronic emanations or disturbance, water, rain or snow or leaks from any part
of the Building or from the pipes, appliances, equipment or plumbing works or
from the roof, street or subsurface or from any other place or caused by
dampness, vandalism, malicious mischief or by any other cause of whatever
nature, unless caused by or due to the negligence of Landlord, its agents,
servants or employees, and then, where notice and an opportunity to cure are
appropriate (i.e., where Tenant has an opportunity to know or should have known
of such condition sufficiently in advance of the occurrence of any such injury
or damage resulting therefrom as would have enabled Landlord to prevent such
damage or loss had Tenant notified Landlord of such condition) only after (i)
notice to Landlord of the condition claimed to constitute negligence and (ii)
the expiration of a reasonable time after such notice has been received by
Landlord without Landlord having taken all reasonable and practicable means to
cure or correct such condition; and pending such cure or correction by Landlord,
Tenant shall take all reasonably prudent temporary measures and safeguards to
prevent any injury, loss or damage to persons or property. In no event shall
Landlord be liable for any loss, the risk of which is covered by Tenant's
insurance or is required to be so covered by this Lease; nor shall Landlord or
its agents be liable for any such damage caused by other tenants or persons in
the Building or caused by operations in construction of any private, public, or
quasi-public work; nor shall Landlord be liable for any latent defect in the
premises or in the Building; provided however, that the foregoing shall not
relieve Landlord of its obligation to perform maintenance and repairs pursuant
to Article 8.7.

         15.6 Repairs and Alterations-No Diminution of Rental Value.

         A. Except as otherwise provided in Article 18, there shall be no
allowance to Tenant for diminution of rental value and no liability on the
<PAGE>   29
part of Landlord by reason of inconvenience, annoyance or injury to Tenant
arising from any repairs, alterations, additions, replacements or improvements
made by Landlord, or any related work, Tenant or others in or to any portion of
the Building or premises or any property adjoining the Building, or in or to
fixtures, appurtenances, or equipment thereof, or for failure of Landlord or
others to make any repairs, alterations, additions or improvements in or to any
portion of the Building, or of the premises, or in or to the fixtures,
appurtenances or equipment thereof.

         B. Notwithstanding anything to the contrary in this Lease contained, if
due to any such repairs, alterations, replacements, or improvements made by
Landlord or if due to Landlord's failure to make any repairs, alterations, or
improvements required to be made by Landlord, any portion of the premises
becomes untenantable so that for the Premises Untenantability Cure Period, as
hereinafter defined, the continued operation in the ordinary course of Tenants
business is materially adversely affected, then, provided that Tenant ceases to
use the affected portion of the premises during the entirety of the Premises
Untenantability Cure Period by reason of such untenantability, and that such
untenantability and Landlord's inability to cure such condition is not caused by
the fault or neglect of Tenant or Tenant's agents, employees or contractors or
other causes beyond Landlord's reasonable control, Yearly Rent, Operating
Expense Excess, Tax Excess, and Electricity Rent shall thereafter be abated in
proportion to such untenantability until the day such condition is completely
corrected. For the purposes hereof, the "Premises Untenantability Cure Period"
shall be defined as three (3) consecutive business days after Landlord's receipt
of written notice from Tenant of the condition causing untenantability in the
premises.

         C. The provisions of Paragraph B of this Article 15.6 shall not apply
in the event of untenantability caused by fire or other casualty, or taking (see
Articles 18 and 20).

16. ASSIGNMENT, MORTGAGING AND SUBLETTING

         A. Except as provided in this Article 16, Tenant covenants and agrees
that neither this Lease nor the term and estate hereby granted, nor any interest
herein or therein, will be assigned, mortgaged, pledged, encumbered or otherwise
transferred, voluntarily, by operation of law or otherwise, and that neither the
premises, nor any part thereof will be encumbered in any manner by reason of any
act or omission on the part of Tenant, or used or occupied, or permitted to be
used or occupied, or utilized for desk space or for mailing privileges, by
anyone other than Tenant, or for any use or purpose other than as stated in
Exhibit 1, or be sublet, or offered or advertised for subletting.
Notwithstanding the foregoing, it is hereby expressly understood and agreed
however, if Tenant is a corporation, that the assignment or transfer of this
Lease, and the term and estate hereby granted, to any corporation into which
Tenant is merged or with which Tenant is consolidated which corporation shall
have a net worth at least equal to that of Tenant immediately prior to such
merger or consolidation (such corporation being hereinafter called "Assignee"),
shall not be deemed to be prohibited hereby if, and upon the express condition
that Assignee and Tenant shall promptly execute, acknowledge and deliver to
Landlord an agreement in form and substance satisfactory to
<PAGE>   30
Landlord whereby Assignee shall agree to be independently bound by and upon all
the covenants, agreements, terms, provisions and conditions set forth in this
Lease on the part of Tenant to be performed, and whereby Assignee shall
expressly agree that the provisions of this Article 16 shall, notwithstanding
such assignment or transfer, continue to be binding upon it with respect to all
future assignments and transfers.

         B. Notwithstanding anything to the contrary in the Lease contained:

               1. Tenant shall, prior to offering or advertising the premises,
or any portion thereof for sublease or assignment give Landlord a Recapture
Offer, as hereinafter defined.

               2. For the purposes hereof a "Recapture Offer" shall be defined
as a notice in writing from Tenant to Landlord which:

                  (a) States that Tenant desires to sublet the premises, or a
portion thereof, or to assign its interest in this Lease.

                  (b) Identifies the affected portion of the premises
("Recapture Premises").

                  (c) Identifies the period of time ("Recapture Period") during
which Tenant proposes to sublet the Recapture Premises or to assign its interest
in the Lease.

                  (d) Offers to Landlord to terminate the Lease in respect of
the Recapture Premises (in the case of a proposed assignment of Tenant's
interest in the Lease or a subletting for the remainder of the term of the
Lease) or to suspend the term of the Lease pro tanto in respect of the Recapture
Period (i.e. the term of the Lease in respect of the Recapture Premises shall be
terminated during the Recapture Period and Tenant's rental obligations shall be
reduced in proportion to the ratio of the Total Rentable Area of the Recapture
Premises to the Total Rentable Area of the premises then demised to Tenant).

         3. Landlord shall have twenty (20) business days to accept a Recapture
Offer. If Landlord does not timely give written notice to Tenant accepting a
Recapture Offer, then Landlord agrees that it will not unreasonably withhold or
delay its consent to a sublease of the Recapture Premises for the Recapture
Period, or an assignment of Tenant's interest in the Lease, as the case may be,
to a Qualified Transferee, as hereinafter defined.

         4. For the purposes hereof, a "Qualified Transferee" shall be defined
as a person, firm or corporation which, in Landlord's reasonable opinion:

                  (a) is financially responsible and of good reputation;

                  (b) is engaged in a business, the functional aspects of which,
with respect to the premises, are similar to the use of other premises made by
other office space tenants in the Building; and
<PAGE>   31
                  (c) is not a tenant or subtenant of premises in the Building
or in the building known as Three Apple Hill, adjacent to the Building.

         5. Notwithstanding anything to the contrary in this Paragraph B
contained:

                  (a) If Tenant is in default of its obligations under the Lease
at the time that it makes the aforesaid offer to Landlord, such default shall be
deemed to be a "reasonable" reason for Landlord withholding its consent to any
proposed subletting or assignment; and

                  (b) If Tenant does not enter into a sublease with a subtenant
(or an assignment to an assignee, as the case may be) approved by Landlord, as
aforesaid, on or before the date which is one hundred (100) days after the
earlier of: (x) the expiration of said twenty (20) business day period, or (y)
the date that Landlord notifies Tenant that Landlord will not accept Tenant's
offer to terminate or suspend the Lease, then Landlord shall have the right
arbitrarily to withhold its consent to any subletting or assignment proposed to
be entered into by Tenant after the expiration of said one hundred (100) day
period unless Tenant again offers, in accordance with this Paragraph B, either
to terminate or to suspend the Lease in respect of the portion of the premises
proposed to be sublet (or in respect of the entirety of the premises in the
event of a proposed assignment, as the case may be). If Tenant shall make any
subsequent offers to terminate or suspend the Lease pursuant to this Paragraph
B, any such subsequent offers shall be treated in all respects as if it is
Tenant's first offer to suspend or terminate the Lease pursuant to this
Paragraph B, provided that the period of time Landlord shall have in which to
accept or reject such subsequent offer shall be twenty (20) business days.

         6. Notwithstanding anything to the contrary herein contained, Tenant
shall have no right, under this Paragraph B hereof, prior to the date one (1)
year after the Term Commencement Date. Without limiting the foregoing, Tenant
shall have no right to give Landlord a Recapture Offer prior to the date one (1)
year after the Term Commencement Date.

         7. No subletting or assignment shall relieve Tenant of its primary
obligation as party-Tenant hereunder, nor shall it reduce or increase Landlord's
obligations under the Lease.

         D. In the event of an assignment of this Lease or a sublease of the
premises or any portion thereof to anyone other than an Affiliate of Tenant,
Tenant shall pay to Landlord fifty (50%) percent of any Net Sublease Profits (as
defined below), payable in accordance with the following. In the case of an
assignment of this Lease, "Net Sublease Profit": (1) shall be defined as a lump
sum in the amount (if any) by which any consideration paid by the assignee in
consideration of or as an inducement to Tenant to make said assignment exceeds
the reasonable attorneys' fees, construction costs and brokerage fees incurred
by Tenant in order to effect such assignment (collectively, "Sublease
Expenses"), and (2) be payable concurrently with the payment to be made by the
assignee to Tenant. In the case of a sublease, "Net Sublease Profit": (3) shall
be defined as a monthly amount equal to the amount by which the sublease rent
and other charges payable by the subtenant to Tenant under the sublease
<PAGE>   32
exceed the sum of the rent and other charges payable under this Lease for the
premises or allocable to the sublet portion thereof, plus a monthly amount equal
to the Sublease Expenses divided by the number of months in the term of the
sublease, and (4) shall be payable on a monthly basis concurrently with the
subtenant's payment of rent to Tenant under the sublease.

         E. If Tenant is an individual who uses and/or occupies the premises
with partners, or if Tenant is a partnership, then:

               (i) Each present and future partner shall be personally bound by
and upon all of the covenants, agreements, terms, provisions and conditions set
forth in this Lease on the part of Tenant to be performed; and

               (ii) In confirmation of the foregoing, Landlord may (but without
being required to do so) request (and Tenant shall duly comply) that Tenant, at
the time that Tenant admits any new partner to its partnership, shall require
each such new partner to execute an agreement in form and substance satisfactory
to Landlord whereby such new partner shall agree to be personally bound by and
upon all of the covenants, agreements, terms, provisions and conditions of this
Lease on the part of Tenant to be performed, without regard to the time when
such new partner is admitted to partnership or when any obligations under any
such covenants, etc., accrue.

         F. The listing of any name other than that of Tenant, whether on the
doors of the premises or on the Building directory, or otherwise, shall not
operate to vest in any such other person, firm or corporation any right or
interest in this Lease or in the premises or be deemed to effect or evidence any
consent of Landlord, it being expressly understood that any such listing, is a
privilege extended by Landlord revocable at will by written notice to Tenant.

         G. If this Lease be assigned, or if the premises or any part thereof be
sublet or occupied by anybody other than Tenant, Landlord may, at any time and
from time to time, collect rent and other charges from the assignee, subtenant
or occupant, and apply the net amount collected to the rent and other charges
herein reserved then due and thereafter becoming due, but no such assignment,
subletting, occupancy or collection shall be deemed a waiver of this covenant,
or the acceptance of the assignee, subtenant or occupant as a tenant, or a
release of Tenant from the further performance by Tenant of covenants on the
part of Tenant herein contained. Any consent by Landlord to a particular
assignment or subletting shall not in any way diminish the prohibition stated in
the first sentence of this Article 16 or the continuing liability of the Tenant
named on Exhibit 1 as the party Tenant under this Lease. No assignment or
subletting shall affect the purpose for which the premises may be used as stated
in Exhibit 1.

17. MISCELLANEOUS COVENANTS

         Tenant covenants and agrees as follows:

         17.1 Rules and Regulations. Tenant will faithfully observe and comply
with the Rules and Regulations, if any, annexed hereto and such other and
further reasonable Rules and Regulations as Landlord hereafter at any time or
from time to time may make and may communicate in writing to Tenant,
<PAGE>   33
which in the reasonable judgment of Landlord shall be necessary for the
reputation, safety, care or appearance of the Building, or the preservation of
good order therein, or tile operation or maintenance of the Building, or the
equipment thereof, or the comfort of tenants or others in the Building,
provided, however, that in the case of any conflict between the provisions of
this Lease and any such regulations, the provisions of this Lease shall control,
and provided further that nothing contained in this Lease shall be construed to
impose upon Landlord any duty or obligation to enforce the Rules and Regulations
or the terms, covenants or conditions in any other lease as against any other
tenant and Landlord shall not be liable to Tenant for violation of the same by
any other tenant, its servants, employees, agents, contractors, visitors,
invitees or licensees.

         17.2 Access to Premises--Shoring. Tenant shall: (i) permit Landlord to
erect, use and maintain pipes, ducts and conduits in and through the premises,
provided the same do not materially reduce the floor area or materially
adversely affect the appearance thereof; (ii) upon prior oral notice (except
that no notice shall be required in emergency situations), permit Landlord and
any mortgagee of the Building or the Building and land or of the interest of
Landlord therein, and any lessor under any ground or underlying lease, and their
representatives, to have free and unrestricted access to and to enter upon the
premises at all reasonable hours for the purposes of inspection or of making
repairs, replacements or improvements in or to the premises or the Building or
equipment (including, without limitation, sanitary, electrical, heating, air
conditioning or other systems) or of complying with all laws, orders and
requirements of governmental or other authority or of exercising any right
reserved to Landlord by this Lease (including the right during the progress of
any such repairs, replacements or improvements or while performing work and
furnishing materials in connection with compliance with any such laws, orders or
requirements to take upon or through, or to keep and store within, the premises
all necessary materials, tools and equipment); and (iii) permit Landlord, at
reasonable times, to show the premises during ordinary business hours to any
existing or prospective mortgagee, ground lessor, space lessee, purchaser, or
assignee of any mortgage, of the Building or of the Building and the land or of
the interest of Landlord therein, and during the period of 12 months next
preceding the Termination Date to any person contemplating the leasing of the
premises or any part thereof. If, during the last month of the term, Tenant
shall have removed all or substantially all of Tenant's property therefrom,
Landlord may immediately enter and alter, renovate and redecorate the premises,
without elimination or abatement of rent, or incurring liability to Tenant for
any compensation, and such acts shall have no effect upon this Lease. If Tenant
shall not be personally present to open and permit an entry into the premises at
any time when for any reason an entry therein shall be necessary or permissible,
Landlord or Landlord's agents may enter the same by a master key, or may
forcibly enter the same, without rendering Landlord or such agents liable
therefor (if during such entry Landlord or Landlord's agents shall accord
reasonable care to Tenant's property), and without in any manner affecting the
obligations and covenants of this Lease. Provided that Landlord shall incur no
additional expense thereby, Landlord shall exercise its rights of access to the
premises permitted under any of the terms and provisions of this Lease in such
manner as to minimize to the extent practicable interference with Tenant's use
and occupation of the
<PAGE>   34
premises. If an excavation shall be made upon land adjacent to the premises or
shall be authorized to be made, Tenant shall afford to the person causing or
authorized to cause such excavation, license to enter upon the premises for the
purpose of doing such work as said person shall deem necessary to preserve the
Building from injury or damage and to support the same by proper foundations
without any claims for damages or indemnity against Landlord, or diminution or
abatement of rent.

         17.3 Accidents to Sanitary and Other Systems. Tenant shall give to
Landlord prompt notice of any fire or accident in the premises or in the
Building and of any damage to, or defective condition in, any part or
appurtenance of the Building including, without limitation, sanitary,
electrical, ventilation, heating and air conditioning or other systems located
in, or passing through, the premises. Except as otherwise provided in Articles
18 and 20, and subject to Tenant's obligations in Article 14, such damage or
defective condition shall be remedied by Landlord with reasonable diligence, but
if such damage or defective condition was caused by Tenant or by the employees,
licensees, contractors or invitees of Tenant, the cost to remedy the same shall
be paid by Tenant. In addition, all reasonable costs incurred by Landlord in
connection with the investigation of any notice given by Tenant shall be paid by
Tenant if the reported damage or defective condition was caused by Tenant or by
the employees, licensees, contractors, or invitees of Tenant.

         17.4 Signs, Blinds and Drapes. Tenant shall put no signs in any part of
the Building which are visible from the exterior of the premises. No signs or
blinds may be put on or in any window or elsewhere if visible from the exterior
of the Building, nor may the building standard drapes or blinds be removed by
Tenant. Notwithstanding the foregoing, Tenant shall have the right, during the
term of the Lease: (i) to list Tenant's name and the name of any permitted
subtenants or assignees on the Building directory, (ii) to install a Building
standard tenant identification sign at Tenant's entrance door, and (iii) to
install a sign identifying Tenant behind the reception desk in the reception
area within Tenant's premises. The initial listing of Tenant's name shall be at
Landlord's cost and expense. Any changes, replacements or additions by Tenant to
such directory shall be at Tenant's sole cost and expense. Tenant may hang its
own drapes, provided that they shall not in any way interfere with the building
standard drapery or blinds or be visible from the exterior of the Building and
that such drapes are so hung and installed that when drawn, the building
standard drapery or blinds are automatically also drawn. Any signs or lettering
in the public corridors or on the doors shall conform to Landlord's building
standard design. Neither Landlord's name, nor the name of the Building or any
Center, Office Park or other Park of which the Building is a part, or the name
of any other structure erected therein shall be used without Landlord's consent
in any advertising material (except on business stationery or as an address in
advertising matter), nor shall any such name, as aforesaid, be used in any
undignified, confusing, detrimental or misleading manner.

         17.5 Estoppel Certificate. Tenant shall at any time and from time to
time upon not less than ten (10) days' prior notice by Landlord to Tenant,
execute, acknowledge and deliver to Landlord a statement in writing certifying
that this Lease is unmodified and in full force and effect (or
<PAGE>   35
if there have been modifications, that the same is in full force and effect as
modified and stating the modifications), and the dates to which the Yearly Rent
and other charges have been paid in advance, if any, stating whether or not
Landlord is in default in performance of any covenant, agreement, term,
provision or condition contained in this Lease and, if so, specifying each such
default and such other facts as Landlord may reasonably request, it being
intended that any such statement delivered pursuant hereto may be relied upon by
any prospective purchaser of the Building or of the Building and the land or of
any interest of Landlord therein, any mortgagee or prospective mortgagee
thereof, any lessor or prospective lessor thereof, any lessee or prospective
lessee thereof, or any prospective assignee of any mortgage thereof. Time is of
the essence in respect of any such requested certificate, Tenant hereby
acknowledging the importance of such certificates in mortgage financing
arrangements, prospective sale and the like. Tenant hereby appoints Landlord
Tenant's attorney-in-fact in its name and behalf to execute such statement if
Tenant shall fail to execute such statement within such ten-(10)-day period,

         17.6 Prohibited Materials and Property. Tenant shall not bring or
permit to be brought or kept in or on the premises or elsewhere in the Building
(i) any inflammable, combustible or explosive fluid, material, chemical or
substance including, without limitation, any hazardous substances as defined
under Massachusetts General Laws chapter 21E, the Federal Comprehensive
Environmental Response Compensation and Liability Act (CERCLA), 42 USC
Section 9601 et seq., as amended, under Section 3001 of the Federal Resource
Conservation and Recovery Act of 1976, as amended, or under any regulation of
any governmental authority regulating environmental or health matters (except
for standard office supplies stored in proper containers), (ii) any materials,
appliances or equipment (including, without limitation, materials, appliances
and equipment selected by Tenant for the construction or other preparation of
the premises and furniture and carpeting) which pose any danger to life, safety
or health or may cause damage, injury or death; (iii) any unique, unusually
valuable, rare or exotic property, work of art or the like unless the same is
fully insured under all-risk coverage, or (iv) any data processing, electronic,
optical or other equipment or property of a delicate, fragile or vulnerable
nature unless the same are housed, shielded and protected against harm and
damage, whether by cleaning or maintenance personnel, radiations or emanations
from other equipment now or hereafter installed in the Building, or otherwise.
Nor shall Tenant cause or permit any potentially harmful air emissions, odors of
cooking or other processes, or any unusual or other objectionable odors or
emissions to emanate from or permeate the premises.

         17.7 Requirements of Law--Fines and Penalties. Tenant at its sole
expense shall comply with all laws, rules, orders and regulations, including,
without limitation, all energy-related requirements, of Federal, State, County
and Municipal Authorities and with any direction of any public officer or
officers, pursuant to law, which shall impose any duty upon Landlord or Tenant
with respect to or arising out of Tenant's use or occupancy of the premises.
Tenant shall reimburse and compensate Landlord for all expenditures made by, or
damages or fines sustained or incurred by, Landlord due to nonperformance or
noncompliance with or breach or failure to observe any item, covenant, or
condition of this Lease upon Tenant's part to be kept, observed, performed or
complied with. If Tenant receives
<PAGE>   36
notice of any violation of law, ordinance, order or regulation applicable to the
premises, it shall give prompt notice thereof to Landlord.

         17.8 Tenant's Acts-Effect on Insurance. Tenant shall not do or permit
to be done any act or thing upon the premises or elsewhere in the Building which
will invalidate or be in conflict with any insurance policies covering the
Building and the fixtures and property therein; and shall not do, or permit to
be done, any act or thing upon the premises which shall subject Landlord to any
liability or responsibility for injury to any person or persons or to property
by reason of any business or operation being carried on upon said premises or
for any other reason. Tenant at its own expense shall comply with all rules,
orders, regulations and requirements of the Board of Fire Underwriters, or any
other similar body having jurisdiction, and shall not (i) do, or permit anything
to be done, in or upon the premises, or bring or keep anything therein, except
as now or hereafter permitted by the Fire Department, Board of Underwriters,
Fire Insurance Rating Organization, or other authority having jurisdiction, and
then only in such quantity and manner of storage as will not increase the rate
for any insurance applicable to the Building, or (ii) use the premises in a
manner which shall increase such insurance rates on the Building, or on property
located therein, over that applicable when Tenant first took occupancy of the
premises hereunder. If by reason of the failure of Tenant to comply with the
provisions hereof the insurance rate applicable to any policy of insurance shall
at any time thereafter be higher than it otherwise would be, the Tenant shall
reimburse Landlord for that part of any insurance premiums thereafter paid by
Landlord, which shall have been charged because of such failure by Tenant.

         17.9 Miscellaneous. Tenant shall not suffer or permit the premises or
any fixtures, equipment or utilities therein or serving the same, to be
overloaded, damaged or defaced, nor permit any hole to be drilled or made in any
part thereof. Tenant shall not suffer or permit any employee, contractor,
business invitee or visitor to violate any covenant, agreement or obligations of
the Tenant under this Lease.

18. DAMAGE BY FIRE, ETC.

         During the entire term of this Lease, and adjusting insurance coverages
to reflect current values from time to time:--(i) Landlord shall keep the
Building (excluding work, installations, improvements and betterments in the
premises which exceed the specifications provided in Exhibit 3, [called
"Over-Building-Standard Property"] and any other property installed by or at the
expense of Tenant) insured against loss or damage caused by any peril covered
under fire, extended coverage and all risk insurance in an amount equal to one
hundred percent (100%) replacement cost value above foundation walls; and (ii)
Tenant shall keep its personal property in and about the premises and the
Over-Building-Standard Property insured against loss or damage caused by any
peril covered under fire, extended coverage and all risk insurance in an amount
equal to one hundred percent (100%) replacement cost value. Such Tenant's
insurance shall insure the interests of both Landlord and Tenant as their
respective interests may appear from time to time and shall name Landlord as an
additional insured; and the proceeds thereof shall be used only for the
replacement or
<PAGE>   37
restoration of such personal property and the Over-Building-Standard Property.

         If any portion of the premises required to be insured by Landlord under
the preceding paragraph shall be damaged by fire or other insured casualty,
Landlord shall proceed with diligence, subject to the then applicable statutes,
building codes, zoning ordinances, and regulations of any governmental
authority, and at the expense of Landlord (but only to the extent of insurance
proceeds made available to Landlord by any mortgagee and/or ground lessor of the
real property of which the premises are a part) to repair or cause to be
repaired such damage, provided, however, in respect of any over-Building
Standard Property as shall have been damaged by such fire or other casualty and
which (in the judgment of Landlord) can more effectively be repaired as an
integral part of Landlord's repair work on the premises, that such repairs to
such Tenant's alterations, decorations, additions and improvements shall be
performed by Landlord but at Tenant's expense; in all other respects, all
repairs to and replacements of Tenant's property and Over-Building-Standard
Property shall be made by and at the expense of Tenant. If the premises or any
part thereof shall have been rendered unfit for use and occupation hereunder by
reason of such damage the Yearly Rent or a just and proportionate part thereof,
according to the nature and extent to which the premises shall have been so
rendered unfit, shall be suspended or abated until the premises (except as to
the property which is to be repaired by or at the expense of Tenant) shall have
been restored as nearly as practicably may be to the condition in which they
were immediately prior to such fire or other casualty, provided, however, that
if Landlord or any mortgagee of the Building or of the Building and the land
shall be unable to collect the insurance proceeds (including rent insurance
proceeds) applicable to such damage because of some action or inaction on the
part of Tenant, or the employees, licensees or invitees of Tenant, the cost of
repairing such damage shall be paid by Tenant and there shall be no abatement of
rent. Landlord shall not be liable for delays in the making of any such repairs
which are due to government regulation, casualties and strikes, unavailability
of labor and materials, and other causes beyond the reasonable control of
Landlord, nor shall Landlord be liable for any inconvenience or annoyance to
Tenant or injury to the business of Tenant resulting from delays in repairing
such damage. If (i) the premises are so damaged by fire or other casualty
(whether or not insured) at any time during the last thirty months of the term
hereof that the cost to repair such damage is reasonably estimated to exceed one
third of the total Yearly Rent payable hereunder for the period from the
estimated date of restoration until the Termination Date, or (ii) the Building
(whether or not including any portion of the premises) is so damaged by fire or
other casualty (whether or not insured) that substantial alteration or
reconstruction or demolition of the Building shall in Landlord's judgment be
required, then and in either of such events, this Lease and the term hereof may
be terminated at the election of Landlord by a notice in writing of its election
so to terminate which shall be given by Landlord to Tenant within sixty (60)
days following such fire or other casualty, the effective termination date of
which shall be not less than thirty (30) days after the day on which such
termination notice is received by Tenant. In the event of any termination, this
Lease and the term hereof shall expire as of such effective termination date as
though that were the Termination Date as stated in Exhibit 1 and the Yearly Rent
shall be
<PAGE>   38
apportioned as of such date; and if the premises or any part thereof shall have
been rendered unfit for use and occupation by reason of such damage the Yearly
Rent for the period from the date of the fire or other casualty to the effective
termination date, or a just and proportionate part thereof, according to the
nature and extent to which the premises shall have been so rendered unfit, shall
be abated.

19. WAIVER OF SUBROGATION

         In any case in which Tenant shall be obligated to pay to Landlord any
loss, cost, damage, liability, or expense suffered or incurred by Landlord,
Landlord shall allow to Tenant as an offset against the amount thereof (i) the
net proceeds of any insurance collected by Landlord for or on account of such
loss, cost, damage, liability or expense, provided that the allowance of such
offset does not invalidate or prejudice the policy or policies under which such
proceeds were payable, and (ii) if such loss, cost, damage, liability or expense
shall have been caused by a peril against which Landlord has agreed to procure
insurance coverage under the terms of this Lease, the amount of such insurance
coverage, whether or not actually procured by Landlord.

         In any case in which Landlord or Landlord's managing agent shall be
obligated to pay to Tenant any loss, cost, damage, liability or expense suffered
or incurred by Tenant, Tenant shall allow to Landlord or Landlord's managing
agent, as the case may be, as an offset against the amount thereof (i) the net
proceeds of any insurance collected by Tenant for or on account of such loss,
cost, damage, liability, or expense, provided that the allowance of such offset
does not invalidate the policy or policies under which such proceeds were
payable and (ii) the amount of any loss, cost, damage, liability or expense
caused by a peril covered by fire insurance with the broadest form of property
insurance generally available on property in buildings of the type of the
Building, whether or not actually procured by Tenant.

         The parties hereto shall each procure an appropriate clause in, or
endorsement on, any property insurance policy covering the premises and the
Building and personal property, fixtures and equipment located thereon and
therein, pursuant to which the insurance companies waive subrogation or consent
to a waiver of right of recovery in favor of either party, its respective agents
or employees. Having, obtained such clauses and/or endorsements, each party
hereby agrees that it will not make any claim against or seek to recover from
the other or its agents or employees for any loss or damage to its property or
the property of others resulting from fire or other perils covered by such
property insurance.

20. CONDEMNATION - EMINENT DOMAIN

         In the event that the premises or any part thereof, or the whole or any
part of the Building, shall be taken or appropriated by eminent domain or shall
be condemned for any public or quasi-public use, or (by virtue of any such
taking, appropriation or condemnation) shall suffer any damage (direct, indirect
or consequential) for which Landlord or Tenant shall be entitled to
compensation, then (and in any such event) this Lease and the term hereof may be
terminated at the election of Landlord by a notice in
<PAGE>   39
writing of its election so to terminate which shall be given by Landlord to
Tenant within sixty (60) days following the date on which Landlord shall have
received notice of such taking, appropriation or condemnation. In the event that
a substantial part of the premises or of the means of access thereto shall be so
taken, appropriated or condemned, then (and in any such event) this Lease and
the term hereof may be terminated at the election of Tenant by a notice in
writing of its election so to terminate which shall be given by Tenant to
Landlord within sixty (60) days following the date on which Tenant shall have
received notice of such taking, appropriation or condemnation.

         Upon the giving of any such notice of termination (either by Landlord
or Tenant) this Lease and the term hereof shall terminate on or retroactively as
of the date on which Tenant shall be required to vacate any part of the premises
or shall be deprived of a substantial part of the means of access thereto,
provided, however, that Landlord may in Landlord's notice elect to terminate
this Lease and the term hereof retroactively as of the date on which such
taking, appropriation or condemnation became legally effective. In the event of
any such termination, this Lease and the term hereof shall expire as of such
effective termination date as though that were the Termination Date as stated in
Exhibit 1, and the Yearly Rent shall be apportioned as of such date. If neither
party (having the right so to do) elects to terminate Landlord will, with
reasonable diligence and at Landlord's expense, restore the remainder of the
premises, or the remainder of the means of access, as nearly as practicably may
be to the same condition as obtained prior to such taking, appropriation or
condemnation in which event (i) the Total Rentable Area shall be adjusted as in
Exhibit 5 provided, (ii) a just proportion of the Yearly Rent, according to the
nature and extent of the taking, appropriation or condemnation and the resulting
permanent injury to the premises and the means of access thereto, shall be
permanently abated, and (iii) a just proportion of the remainder of the Yearly
Rent, according to the nature and extent of the taking, appropriation or
condemnation and the resultant injury sustained by the premises and the means of
access thereto, shall be abated until what remains of the premises and the means
of access thereto shall have been restored as fully as may be for permanent use
and occupation by Tenant hereunder. Except for any award specifically
reimbursing Tenant for moving or relocation expenses, there are expressly
reserved to Landlord all rights to compensation and damages created, accrued or
accruing by reason of any such taking, appropriation or condemnation, in
implementation and in confirmation of which Tenant does hereby acknowledge that
Landlord shall be entitled to receive all such compensation and damages, grant
to Landlord all and whatever rights (if any) Tenant may have to such
compensation and damages, and agree to execute and deliver all and whatever
further instruments of assignment as Landlord may from time to time request. In
the event of any taking of the premises or any part thereof for temporary (i.e.,
not in excess of one (1) year) use, (i) this Lease shall be and remain
unaffected thereby, and (ii) Tenant shall be entitled to receive for itself any
award made to the extent allocable to the premises in respect of such taking on
account of such use, provided, that if any taking is for a period extending
beyond the term of this Lease, such award shall be apportioned between Landlord
and Tenant as of the Termination Date or earlier termination of this Lease.
<PAGE>   40
21. DEFAULT

         21.1 Conditions of Limitation - Re-entry - Termination. This Lease and
the herein term and estate are, upon the condition that if (a) subject to
Article 21.7, Tenant shall neglect or fail to perform or observe any of the
Tenant's covenants or agreements herein, including (without limitation) the
covenants or agreements with regard to the payment when due of rent, additional
charges, reimbursement for increase in Landlord's costs, or any other charge
payable by Tenant to Landlord (all of which shall be considered as part of
Yearly Rent for the purposes of invoking Landlord's statutory or other rights
and remedies in respect of payment defaults); or (b) Tenant shall desert or
abandon the premises or the same shall become, or shall appear to have become,
vacant (whether or not the keys shall have been surrendered or the rent shall
have been paid); or (c) Tenant shall be involved in financial difficulties as
evidenced by an admission in writing by Tenant of Tenant's inability to pay its
debts generally as they become due, or by the making or offering to make a
composition of its debts with its creditors; or (d) Tenant shall make an
assignment or trust mortgage, or other conveyance or transfer of like nature, of
all or a substantial part of its property for the benefit of its creditors, or
(e) an attachment on mesne process, on execution or otherwise, or other legal
process shall issue against Tenant or its property and a sale of any of its
assets shall be held thereunder; or (f) intentionally omitted; or (g) the
leasehold hereby created shall be taken on execution or by other process of law
and shall not be revested in Tenant within thirty (30) days thereafter; or (h) a
receiver, sequesterer, trustee or similar officer shall be appointed by a court
of competent jurisdiction to take charge of all or any part of Tenant's property
and such appointment shall not be vacated within thirty (30) days; or (i) any
proceeding shall be instituted by or against Tenant pursuant to any of the
provisions of any Act of Congress or State law relating to bankruptcy,
reorganizations, arrangements, compositions or other relief from creditors, and,
in the case of any proceeding instituted against it, if Tenant shall fail to
have such proceedings dismissed within thirty (30) days or if Tenant is adjudged
bankrupt or insolvent as a result of any such proceeding, or (j) any event shall
occur or any contingency shall arise whereby this Lease, or the term and estate
thereby created, would (by operation of law or otherwise) devolve upon or pass
to any person, firm or corporation other than Tenant, except as expressly
permitted under Article 16 hereof then, and in any such event (except as
hereinafter in Article 21.2 otherwise provided) Landlord may, by notice to
Tenant, elect to terminate this Lease; and thereupon (and without prejudice to
any remedies which might otherwise be available for arrears of rent or other
charges due hereunder or preceding breach of covenant or agreement and without
prejudice to Tenant's liability for damages as hereinafter stated), upon the
giving of such notice, this Lease shall terminate as of the date specified
therein as though that were the Termination Date as stated in Exhibit 1. Without
being taken or deemed to be guilty of any manner of trespass or conversion, and
without being liable to indictment, prosecution or damages therefor, Landlord
may, forcibly if necessary, enter into and upon the premises (or any part
thereof in the name of the whole); repossess the same as of its former estate;
and expel Tenant and those claiming under Tenant. Wherever "Tenant " is used in
subdivisions (c), (d), (e), (f), (g), (h) and (i) of this Article 21.1, it shall
be deemed to include any one of (i) any corporation of which Tenant is a
controlled
<PAGE>   41
subsidiary and (ii) any guarantor of any of Tenant's obligations under this
Lease. The words "re-entry" and "re-enter" as used in this Lease are not
restricted to their technical legal meanings.

         21.2 Intentionally Omitted.

         21.3 Damages - Termination. Upon the termination of this Lease under
tile provisions of this Article 21, then except as hereinabove in Article 21.2
otherwise provided, Tenant shall pay to Landlord the rent and other charges
payable by Tenant to Landlord up to tile time of such termination, shall
continue to be liable for any preceding breach of covenant, and in addition,
shall pay to Landlord as damages at the election of Landlord

         either:

         (x) the amount by which, at the time of the termination of
this Lease (or at any time thereafter if Landlord shall have initially elected
damages under subparagraph (y), below), (i) the aggregate of the rent and other
charges projected over the period commencing with such termination and ending on
the Termination Date as stated in Exhibit 1 exceeds (ii) the aggregate projected
rental value of the premises for such period based upon the then current market
conditions;

         or:

         (y) amounts equal to the rent and other charges which would
have been payable by Tenant had this Lease not been so terminated, payable upon
the due dates therefor specified herein following such termination and until the
Termination Date as specified in Exhibit 1, provided, however, if Landlord shall
re-let the premises during such period, that Landlord shall credit Tenant with
the net rents received by Landlord from such re-letting, such net rents to be
determined by first deducting from the gross rents as and when received by
Landlord from such re-letting the expenses incurred or paid by Landlord in
terminating this Lease, as well as the expenses of re-letting, including
altering and preparing the premises for new tenants, brokers' commissions, and
all other similar and dissimilar expenses properly chargeable against the
premises and the rental therefrom, it being understood that any such re-letting
may be for a period equal to or shorter or longer than the remaining term of
this Lease; and provided, further, that (i) in no event shall Tenant be entitled
to receive any excess of such net rents over the sums payable by Tenant to
Landlord hereunder and (ii) in no event shall Tenant be entitled in any suit for
the collection of damages pursuant to this Subparagraph (y) to a credit in
respect of any net rents from a re-letting except to the extent that such net
rents are actually received by Landlord relate to the period of time on which
the judgment rendered in such suit is based. If the premises or any part thereof
should be re-let in combination with other space, then proper apportionment on a
square foot area basis shall be made of the rent received from such re-letting
and of the expenses of re-letting.

         In calculating the rent and other charges under Subparagraph (x),
above, there shall be included, in addition to the Yearly Rent, Tax Excess and
Operating Expense Excess and all other considerations agreed to be paid or
performed by Tenant, on the assumption that all such amounts and
<PAGE>   42
considerations would have remained constant (except as herein otherwise
provided) for the balance of the full term hereby granted.

         Suit or suits for the recovery of such damages, or any installments
thereof, may be brought by Landlord from time to time at its election, and
nothing contained herein shall be deemed to require Landlord to postpone suit
until the date when the term of this Lease would have expired if it had not been
terminated hereunder.

         Nothing herein contained shall be construed as limiting or precluding
the recovery by Landlord against Tenant of any sums or damages to which, in
addition to the damages particularly provided above, Landlord may lawfully be
entitled by reason of any default hereunder on the part of Tenant.

         Landlord agrees to use reasonable efforts to relet the premises after
Tenant vacates the premises in tile event that the Lease is terminated based
upon a default by Tenant hereunder. Marketing of Tenant's premises in a manner
similar to the manner in which Landlord markets other premises within Landlord's
control in the Building shall be deemed to have satisfied Landlord's obligation
to use "reasonable efforts." In no event shall Landlord be required to (i)
solicit or entertain negotiations with any other prospective tenants for the
premises until Landlord obtains full and complete possession of the premises
including, without limitation, the final and unappealable legal right to re-let
the premises free of any claim of Tenant, (ii) relet the premises before
leasing, other vacant space in the Building or in Three Apple Hill, or (iii)
lease the premises for a rental less than the current fair market rental then
prevailing for similar office space in the Building.

         21.4 Fees and Expenses.

               (a) If Tenant shall default in the performance of any covenant on
Tenant's part to be performed as in this Lease contained, Landlord may
immediately, or at any time thereafter, without notice, perform the same for the
account of Tenant. If Landlord at any time is compelled to pay or elects to pay
any sum of money, or do any act which will require the payment of any sum of
money, by reason of the failure of Tenant to comply with any provision hereof,
or if Landlord is compelled to or does incur any expense, including reasonable
attorneys' fees, in instituting, prosecuting, and/or defending any action or
proceeding instituted by reason of any default of Tenant hereunder, Tenant shall
on demand pay to Landlord by way of reimbursement the sum or sums so paid by
Landlord with all costs and damages, plus interest computed as provided in
Article 6 hereof.

               (b) Tenant shall pay Landlord's cost and expense, including
reasonable attorneys' fees, incurred (i) in enforcing any obligation of Tenant
under this Lease or (ii) as a result of Landlord, without its fault, being made
party to any litigation pending by or against Tenant or any persons claiming
through or under Tenant. Tenant shall not be obligated to make any payment to
Landlord of any attorneys' fees incurred by Landlord unless judgment is entered
(final, and beyond appeal) in favor of Landlord in the lawsuit relating to such
fees. Landlord shall pay, upon demand by Tenant, Tenant's costs and expenses,
including reasonable attorneys' fees, incurred by Tenant in connection with any
lawsuit between Landlord and
<PAGE>   43
Tenant where judgment is entered (final, and beyond appeal) in favor of Tenant.

         21.5 Waiver of Redemption. Tenant does hereby waive and surrender all
rights and privileges which it might have under or by reason of any present or
future law to redeem the premises or to have a continuance of this Lease for the
term hereby demised after being dispossessed or ejected therefrom by process of
law or under the terms of this Lease or after the termination of this Lease as
herein provided.

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

         21.7 Grace Period. Notwithstanding anything to the contrary in this
Article contained, Landlord agrees not to take any action to terminate this
Lease (a) for default by Tenant in the payment when due of any sum of money, if
Tenant shall cure such default within five (5) business days after written
notice thereof is given by Landlord to Tenant, provided, however, that no such
notice need be given and no such default in the payment of money shall be
curable if on two (2) prior occasions in the most recent twelve month period
there had been a default in the payment of money which had been cured after
notice thereof had been given by Landlord to Tenant as herein provided or (b)
for default by Tenant in the performance of any covenant other than a covenant
to pay a sum of money, if Tenant shall cure such default within a period of
thirty (30) days after written notice thereof given by Landlord to Tenant
(except where the nature of the default is such that remedial action should
appropriately take place sooner, as indicated in such written notice), or within
such additional period as may reasonably be required to cure such default if
(because of governmental restrictions or any other cause beyond the reasonable
control of Tenant) the default is of such a nature that it cannot be cured
within such thirty-(30)-day period, provided, however, (1) that there shall be
no extension of time beyond such thirty-(30)-day period for the curing of any
such default unless, not more than ten (10) business days after the receipt of
the notice of default, Tenant in writing (i) shall specify the cause on account
of which the default cannot be cured during such period and shall advise
Landlord of its intention duly to institute all steps necessary to cure the
default and (ii) shall, as soon as reasonably practicable, duly institute and
thereafter diligently prosecute to completion all steps necessary to cure such
default and, (2) that no notice of the opportunity to cure a default need be
given, and no grace period whatsoever shall be allowed to Tenant, if the default
is incurable or if the covenant.

         Notwithstanding anything to the contrary in this Article 21.7
contained, except to the extent prohibited by applicable law, any statutory
notice and grace periods provided to Tenant by law are hereby expressly waived
by Tenant.

22. END OF TERM - ABANDONED PROPERTY
<PAGE>   44
         Upon the expiration or other termination of the term of this Lease,
Tenant shall peaceably quit and surrender to Landlord the premises and all
alterations and additions thereto, broom clean, in good order, repair and
condition (except as provided herein and in Articles 8.7, 18 and 20) excepting
only ordinary wear and use and damage by fire or other casualty for which, under
other provisions of this Lease, Tenant has no responsibility of repair or
restoration. Tenant shall remove all of its property and, to the extent
specified by Landlord, all alterations and additions made by Tenant and all
partitions wholly within the premises, and shall repair any damages to the
premises or the Building caused by their installation or by such removal.
Tenant's obligation to observe or perform this covenant shall survive the
expiration or other termination of the term of this Lease.

         Tenant will remove any personal property from the Building and the
premises upon or prior to the expiration or termination of this Lease. If any
such property which shall remain in the Building or the premises after the
expiration of the term of the Lease or, if the term of the Lease terminates
prior to the expiration of the term, and any such property shall remain in the
Building after the date ten (10) days after Landlord gives Tenant written notice
to remove such property, then such property shall be conclusively deemed to have
been abandoned, and may either be retained by Landlord as its property or sold
or otherwise disposed of in such manner as Landlord may see fit. If any part
thereof shall be sold, that Landlord may receive and retain the proceeds of such
sale and apply the same, at its option, against the expenses of the sale, the
cost of moving and storage, any arrears of Yearly Rent, additional or other
charges payable hereunder by Tenant to Landlord and any damages to which
Landlord may be entitled under Article 21 hereof or pursuant to law, and the
balance shall be remitted by Landlord to Tenant.

         If Tenant or anyone claiming under Tenant shall remain in possession of
the premises or any part thereof after the expiration or prior termination of
the term of this Lease without any agreement in writing between Landlord and
Tenant with respect thereto, then, prior to the acceptance of any payments for
rent or use and occupancy by Landlord, the person remaining in possession shall
be deemed a tenant-at-sufferance. Whereas the parties hereby acknowledge that
Landlord may need the premises after the expiration or prior termination of the
term of the Lease for other tenants and that the damages which Landlord may
suffer as the result of Tenant's holding-over cannot be determined as of the
Execution Date hereof, in the event that Tenant so holds over, Tenant shall pay
to Landlord in addition to all rental and other charges due and accrued under
the Lease prior to the date of termination, charges (based upon fair market
rental value of the premises) for use and occupation of the premises thereafter
and, in addition to such sums and any and all other rights and remedies which
Landlord may have at law or in equity, an additional use and occupancy charge in
the amount of fifty percent (50%) of either the Yearly Rent and other charges
calculated (on a daily basis) at the highest rate payable under the terms of
this Lease, but measured from the day on which Tenant's hold-over commenced and
terminating on the day on which Tenant vacates the premises or the fair market
value of the premises for such period, whichever is greater. In addition, Tenant
shall save Landlord, its agents and employees, harmless and will exonerate,
defend and indemnify
<PAGE>   45
Landlord, its agents and employees, from and against any and all damages which
Landlord may suffer on account of Tenant's hold-over in the premises after the
expiration or prior termination of the term of the Lease.

23. SUBORDINATION

         (a) Subject to any mortgagee's or ground lessor's election, as
hereinafter provided for, this Lease is subject and subordinate in all respects
to all matters of record (including, without limitation, deeds and land
disposition agreements), ground leases and/or underlying leases, and all
mortgages, any of which may now or hereafter be placed on or affect such leases
and/or the real property of which the premises are a part, or any part of such
real property, and/or Landlord's interest or estate therein, and to each advance
made and/or hereafter to be made under any such mortgages, and to all renewals,
modifications, consolidations, replacements and extensions thereof and all
substitutions therefor. This Article 23 shall be self-operative and no further
instrument or subordination shall be required. In confirmation of such
subordination, Tenant shall execute, acknowledge and deliver promptly any
certificate or instrument that Landlord and/or any mortgagee and/or lessor under
any ground or underlying lease and/or their respective successors in interest
may request, subject to Landlord's, mortgagee's and ground lessor's right to do
so for, on behalf and in the name of Tenant under certain circumstances, as
hereinafter provided. Tenant acknowledges that, where applicable, any consent or
approval hereafter given by Landlord may be subject to the further consent or
approval of such mortgagee and/or ground lessor; and the failure or refusal of
such mortgagee and/or ground lessor to give such consent or approval shall,
notwithstanding anything to the contrary in this Lease contained, constitute
reasonable justification for Landlord's withholding its consent or approval.

         (b) Any such mortgagee or ground lessor may from time to time
subordinate or revoke any such subordination of the mortgage or ground lease
held by it to this Lease. Such subordination or revocation, as the case may be,
shall be effected by written notice to Tenant and by recording an instrument of
subordination or of such revocation, as the case may be, with the appropriate
registry of deeds or land records and to be effective without any further act or
deed on the part of Tenant. In confirmation of such subordination or of such
revocation, as the case may be, Tenant shall execute, acknowledge and promptly
deliver any certificate or instrument that Landlord, any mortgagee or ground
lessor may request, subject to Landlord's, mortgagee's and ground lessor's right
to do so for, on behalf and in the name of Tenant under certain circumstances,
as hereinafter provided.

         (c) Without limitation of any of the provisions of this Lease, if any
ground lessor or mortgagee shall succeed to the interest of Landlord by reason
of the exercise of its rights under such ground lease or mortgage (or the
acceptance of voluntary conveyance in lieu thereof) or any third party
(including, without limitation, any foreclosure purchaser or mortgage receiver)
shall succeed to such interest by reason of any such exercise or the expiration
or sooner termination of such ground lease, however caused, then such successor
may, upon notice and request to Tenant (which, in the case of a ground lease,
shall be within thirty (30) days after such
<PAGE>   46
expiration or sooner termination), succeed to the interest of Landlord under
this Lease, provided, however, that such successor shall not: (i) be liable for
any previous act or omission of Landlord under this Lease; (ii) be subject to
any offset, defense, or counterclaim which shall theretofore have accrued to
Tenant against Landlord; (iii) have any obligation with respect to any security
deposit unless it shall have been paid over or physically delivered to such
successor; or (iv) be bound by any previous modification of this Lease or by any
previous payment of Yearly Rent for a period greater than one (1) month, made
without such ground lessor's or mortgagee's consent where such consent is
required by applicable ground lease or mortgage documents. In the event of such
succession to the interest of the Landlord -- and notwithstanding that any such
mortgage or ground lease may antedate this Lease -- the Tenant shall attorn to
such successor and shall ipso facto be and become bound directly to such
successor in interest to Landlord to perform and observe all the Tenant's
obligations under this Lease without the necessity of the execution of any
further instrument. Nevertheless, Tenant agrees at any time and from time to
time during the term hereof to execute a suitable instrument in confirmation of
Tenant's agreement to attorn, as aforesaid, subject to Landlord's, mortgagee's
and ground lessor's right to do so for, on behalf and in the name of Tenant
under certain circumstances, as hereinafter provided.

         (d) The term "mortgage(s)" as used in this Lease shall include any
mortgage or deed of trust. The term "mortgagee(s)" as used in this Lease shall
include any mortgagee or any trustee and beneficiary under a deed of trust or
receiver appointed under a mortgage or deed of trust. The term "mortgagor(s)" as
used in this Lease shall include any mortgagor or any grantor under a deed of
trust.

         (e) Tenant hereby irrevocably constitutes and appoints Landlord or any
such mortgagee or ground lessor, and their respective successors in interest,
acting singly, Tenant's attorney-in-fact to execute and deliver any such
certificate or instrument for, on behalf and in the name of Tenant, but only if
Tenant fails to execute, acknowledge and deliver any such certificate or
instrument within ten (10) days after Landlord or such mortgagee or such ground
lessor has made written request therefor.

         (f) Notwithstanding anything to the contrary contained in this Article
23, if all or part of Landlord's estate and interest in the real property of
which the premises are a part shall be a leasehold estate held under a ground
lease, then: (i) the foregoing subordination provisions of this Article 23 shall
not apply to any mortgages of the fee interest in said real property to which
Landlord's leasehold estate is not otherwise subject and subordinate; and (ii)
the provisions of this Article 23 shall in no way waive, abrogate or otherwise
affect any agreement by any ground lessor (x) not to terminate this Lease
incident to any termination of such ground lease prior to its term expiring or
(y) not to name or join Tenant in any action or proceeding by such ground lessor
to recover possession of such real property or for any other relief.

         (g) In the event of any failure by Landlord to perform, fulfill or
observe any agreement by Landlord herein, in no event will the Landlord be
deemed to be in default under this Lease permitting Tenant to exercise any
<PAGE>   47
or all rights or remedies under this Lease until the Tenant shall have given
written notice of such failure to any mortgagee (ground lessor and/or trustee)
of which Tenant shall have been advised and until a reasonable period of time
shall have elapsed following the giving of such notice, during which such
mortgagee (ground lessor and/or trustee) shall have the right, but shall not be
obligated, to remedy such failure.

24. QUIET ENJOYMENT

         Landlord covenants that if, and so long as, Tenant keeps and performs
each and every covenant, agreement, term, provision and condition herein
contained on the part and on behalf of Tenant to be kept and performed, Tenant
shall quietly enjoy the premises from and against the claims of all persons
claiming by, through or under Landlord subject, nevertheless, to the covenants,
agreements, terms, provisions and conditions of this Lease and to the mortgages,
ground leases and/or underlying leases to which this Lease is subject and
subordinate, as hereinabove set forth.

         Without incurring any liability to Tenant, Landlord may permit access
to the premises and open the same, whether or not Tenant shall be present, upon
any demand of any receiver, trustee, assignee for the benefit of creditors,
sheriff, marshal or court officer entitled to, or reasonably purporting to be
entitled to, such access for the purpose of taking possession of, or removing,
Tenant's property or for any other lawful purpose (but this provision and any
action by Landlord hereunder shall not be deemed a recognition by Landlord that
the person or official making such demand has any right or interest in or to
this Lease, or in or to the premises), or upon demand of any representative of
the fire, police, building, sanitation or other department of the city, state or
federal governments.

25. ENTIRE AGREEMENT -- WAIVER -- SURRENDER

         25.1 Entire Agreement. This Lease, the Rider, and the Exhibits made a
part hereof contain the entire and only agreement between the parties and any
and all statements and representations, written and oral, including previous
correspondence and agreements between the parties hereto, are merged herein.
Tenant acknowledges that all representations and statements upon which it relied
in executing this Lease are contained herein and that the Tenant in no way
relied upon any other statements or representations, written or oral. Any
executory agreement hereafter made shall be ineffective to change, modify,
discharge or effect an abandonment of this Lease in whole or in part unless such
executory agreement is in writing and signed by the party against whom
enforcement of the change, modification, discharge or abandonment is sought.

         25.2 Waiver. The failure of Landlord to seek redress for violation, or
to insist upon the strict performance, of any covenant or condition of this
Lease, or any of the Rules and Regulations promulgated hereunder, shall not
prevent a subsequent act, which would have originally constituted a violation,
from having all the force and effect of an original violation. The receipt by
Landlord of rent with knowledge of the breach of any covenant of this Lease
shall not be deemed a waiver of such breach. The failure of Landlord to enforce
any of such Rules and Regulations against
<PAGE>   48
Tenant and/or any other tenant in the Building shall not be deemed a waiver of
any such Rules and Regulations. No provisions of this Lease shall be deemed to
have been waived by either party unless such waiver be in writing signed by such
party. No payment by Tenant or receipt by Landlord of a lesser amount than the
monthly rent herein stipulated shall be deemed to be other than on account of
the stipulated rent, nor shall any endorsement or statement on any check or any
letter accompanying any check or payment as rent be deemed an accord and
satisfaction, and Landlord may accept such check or payment without prejudice to
Landlord's right to recover the balance of such rent or pursue any other remedy
in this Lease provided.

         25.3 Surrender. No act or thing done by Landlord during the term hereby
demised shall be deemed an acceptance of a surrender of the premises, and no
agreement to accept such surrender shall be valid, unless in writing signed by
Landlord. No employee of Landlord or of Landlord's agents shall have any power
to accept the keys of the premises prior to the termination of this Lease. The
delivery of keys to any employee of Landlord or of Landlord's agents shall not
operate as a termination of the Lease or a surrender of the premises. In the
event that Tenant at any time desires to have Landlord underlet the premises for
Tenant's account, Landlord or Landlord's agents are authorized to receive the
keys for such purposes without releasing Tenant from any of the obligations
under this Lease, and Tenant hereby relieves Landlord of any liability for loss
of or damage to any of Tenant's effects in connection with such underletting.

26. INABILITY TO PERFORM - EXCULPATORY CLAUSE

         Except as provided in Article 4.1 and 4.2 hereof, this Lease and the
obligations of Tenant to pay rent hereunder and perform all the other covenants,
agreements, terms, provisions and conditions hereunder on the part of Tenant to
be performed shall in no way be affected, impaired or excused because Landlord
is unable to fulfill any of its obligations under this Lease or is unable to
supply or is delayed in supplying any service expressly or impliedly to be
supplied or is unable to make or is delayed in making any repairs, replacements,
additions, alterations, improvements or decorations or is unable to supply or is
delayed in supplying any equipment or fixtures if Landlord is prevented or
delayed from so doing by reason of strikes or labor troubles or any other
similar or dissimilar cause whatsoever beyond Landlord's reasonable control,
including but not limited to, governmental preemption in connection with a
national emergency or by reason of any rule, order or regulation of any
department or subdivision thereof of any governmental agency or by reason of the
conditions of supply and demand which have been or are affected by war,
hostilities or other similar or dissimilar emergency. In each such instance of
inability of Landlord to perform, Landlord shall exercise reasonable diligence
to eliminate the cause of such inability to perform.

         Tenant shall neither assert nor seek to enforce any claim against
Landlord, or Landlord's agents or employees, or the assets of Landlord or of
Landlord's agents or employees, for breach of this Lease or otherwise, other
than against Landlord's interest in the Building of which the premises are a
part and in the uncollected rents, issues and profits thereof, and Tenant agrees
to look solely to such interest for the satisfaction of any liability of
Landlord under this Lease, it being
<PAGE>   49
specifically agreed that in no event shall Landlord or Landlord's agents or
employees (or any of the officers, trustees, directors, partners, beneficiaries,
joint venturers, members, stockholders or other principals or representatives,
and the like, disclosed or undisclosed, thereof) ever be personally liable for
any such liability. This paragraph shall not limit any right that Tenant might
otherwise have to obtain injunctive relief against Landlord or to take any other
action which shall not involve the personal liability of Landlord to respond in
monetary damages from Landlord's assets other than the Landlord's interest in
said real estate, as aforesaid. In no event shall Landlord or Landlord's agents
or employees (or any of the officers, trustees, directors, partners,
beneficiaries, joint venturers, members, stockholders or other principals or
representatives and the like, disclosed or undisclosed, thereof) ever be liable
for consequential or incidental damages. Without limiting the foregoing, in no
event shall Landlord or Landlord's agents or employees (or any of the officers,
trustees, directors, partners, beneficiaries, joint venturers, members,
stockholders or other principals or representatives and the like, disclosed or
undisclosed, thereof) ever be liable for lost profits of Tenant. If by reason of
Landlord's failure to acquire title to the real property of which the premises
are a part or to complete construction of the Building or premises, Landlord
shall be held to be in breach of this Lease, Tenant's sole and exclusive remedy
shall be a right to terminate this Lease.

27. BILLS AND NOTICES

         Any notice, consent, request, bill, demand or statement hereunder by
either party to the other party shall be in writing and, if received at
Landlord's or Tenant's address, shall be deemed to have been duly given when
either delivered or served personally or mailed in a postpaid envelope,
deposited in the United States mail addressed to Landlord at its address as
stated in Exhibit 1 and to Tenant at the premises (or at Tenant's address as
stated in Exhibit 1, if mailed prior to Tenant's occupancy of the premises), or
if any address for notices shall have been duly changed as hereinafter provided,
if mailed as aforesaid to the party at such changed address. Either party may at
any time change the address or specify an additional address for such notices,
consents, requests, bills, demands or statements by delivering or mailing, as
aforesaid, to the other party a notice stating the change and setting forth the
changed or additional address, provided such changed or additional address is
within the United States.

         If Tenant is a partnership, Tenant, for itself, and on behalf of all of
its partners, hereby appoints Tenant's Service Partner, as identified on Exhibit
1, to accept service of any notice, consent, request bill, demand or statement
hereunder by Landlord and any service of process in any judicial proceeding with
respect to this Lease on behalf of Tenant and as agent and attorney-in-fact for
each partner of Tenant.

         All bills and statements for reimbursement or other payments or charges
due from Tenant to Landlord hereunder shall be due and payable in full ten (10)
days, unless herein otherwise provided, after submission thereof by Landlord to
Tenant. Tenant's failure to make timely payment of any amounts indicated by such
bills and statements, whether for work done
<PAGE>   50
by Landlord at Tenant's request, reimbursement provided for by this Lease or for
any other sums properly owing by Tenant to Landlord, shall be treated as a
default in the payment of rent, in which event Landlord shall have all rights
and remedies provided in this Lease for the nonpayment of rent.

28. PARTIES BOUND -- SEIZING OF TITLE

         The covenants, agreements, terms, provisions and conditions of this
Lease shall bind and benefit the successors and assigns of the parties hereto
with the same effect as if mentioned in each instance where a party hereto is
named or referred to, except that no violation of the provisions of Article 16
hereof shall operate to vest any rights in any successor or assignee of Tenant
and that the provisions of this Article 28 shall not be construed as modifying
the conditions of limitation contained in Article 21 hereof.

         If, in connection with or as a consequence of the sale, transfer or
other disposition of the real estate (land and/or Building, either or both, as
the case may be) of which the premises are a part, Landlord ceases to be the
owner of the reversionary interest in the premises, Landlord shall be entirely
freed and relieved from the performance and observance thereafter of all
covenants and obligations hereunder on the part of Landlord to be performed and
observed, it being understood and agreed in such event (and it shall be deemed
and construed as a covenant running with the land) that the person succeeding to
Landlord's ownership of said reversionary interest shall thereupon and
thereafter assume, and perform and observe, any and all of such covenants and
obligations of Landlord.

29. MISCELLANEOUS

         29.1 Separability. If any provision of this Lease or portion of such
provision or the application thereof to any person or circumstance is for any
reason held invalid or unenforceable, the remainder of the Lease (or the
remainder of such provision) and the application thereof to other persons or
circumstances shall not be affected thereby.

         29.2 Captions, etc. The captions are inserted only as a matter of
convenience and for reference, and in no way define, limit or describe the scope
of this Lease nor the intent of any provisions thereof. References to "State"
shall mean, where appropriate, the District of Columbia and other Federal
territories, possessions, as well as a state of the United States.

         29.3 Broker. Tenant represents and warrants that it has not directly or
indirectly dealt, with respect to the leasing of office space in the Building or
any Center, Office Park or other Park of which it is a part (called "Building,
etc." in this Article 29.3) with any broker or had its attention called to the
premises or other space to let in the Building, etc. by anyone other than the
broker, person or firm, if any, designated in Exhibit 1. Tenant agrees to
defend, exonerate and save harmless and indemnify Landlord and anyone claiming
by, through or under Landlord against any claims for a commission arising out of
the execution and delivery of this Lease or out of negotiations between Landlord
and Tenant with respect to the leasing of other space in the Building, etc.,
provided
<PAGE>   51
that Landlord shall be solely responsible for the payment of brokerage
commissions to the broker, person or firm, if any, designated in Exhibit 1.

         29.4 Modifications. If in connection with obtaining financing for the
Building, a bank, insurance company, pension trust or other institutional lender
shall request reasonable modifications in this Lease as a condition to such
financing, Tenant will not withhold, delay or condition its consent thereto,
provided that such modifications do not increase the obligations of Tenant
hereunder, materially decrease the obligations of Landlord, or materially
adversely affect the leasehold interest hereby created.

         29.5 Arbitration. Any disputes relating to provisions or obligations in
this Lease as to which a specific provision for a reference to arbitration is
made herein shall be submitted to arbitration in accordance with the provisions
of applicable state law (as identified on Exhibit 1), as from time to time
amended. Arbitration proceedings, including the selection of an arbitrator,
shall be conducted pursuant to the rules, regulations and procedures from time
to time in effect as promulgated by the American Arbitration Association. Prior
written notice of application by either party for arbitration shall be given to
the other at least ten (10) days before submission of the application to the
said Association's office in tile City wherein the Building is situated (or the
nearest other city having an Association office). The arbitrator shall hear the
parties and their evidence. The decision of the arbitrator shall be binding and
conclusive, and judgment upon the award or decision of the arbitrator may be
entered in the appropriate court of law (as identified on Exhibit 1); and the
parties consent to the jurisdiction of such court and further agree that any
process or notice of motion or other application to the Court or a Judge thereof
may be served outside the State wherein the Building is situated by registered
mail or by personal service, provided a reasonable time for appearance is
allowed. The costs and expenses of each arbitration hereunder and their
apportionment between the parties shall be determined by the arbitrator in his
award or decision. No arbitrable dispute shall be deemed to have arisen under
this Lease prior to (i) the expiration of the period of twenty (20) days after
the date of the giving of written notice by the party asserting the existence of
the dispute together with a description thereof sufficient for an understanding
thereof, and (ii) where a Tenant payment (e.g., Tax Excess or Operating Expense
Excess under Article 9 hereof) is in issue, the amount billed by Landlord having
been paid by Tenant to the extent that such amount is not disputed by Tenant in
good faith.

29.6 Governing Law. This Lease is made pursuant to, and shall be governed by,
and construed in accordance with, the laws of the State wherein the Building is
situated and any applicable local municipal rules, regulations, by-laws,
ordinances and the like.

29.7 Assignment of Rents. With reference to any assignment by Landlord of its
interest in this Lease, or the rents payable hereunder, conditional in nature or
otherwise, which assignment is made to or held by a bank, trust company,
insurance company or other institutional lender holding a mortgage or ground
lease on the Building, Tenant agrees:
<PAGE>   52
         (a) that the execution thereof by Landlord and the acceptance thereof
by such mortgagee and/or ground lessor shall never be deemed an assumption by
such mortgagee and/or ground lessor of any of the obligations of the Landlord
thereunder, unless such mortgagee and/or ground lessor shall, by written notice
sent to the Tenant, specifically otherwise elect; and

         (b) that, except as aforesaid, such mortgagee and/or ground lessor
shall be treated as having assumed the Landlord's obligations thereunder only
upon foreclosure of such mortgagee's mortgage or deed of trust or termination of
such ground lessor's ground lease and the taking of possession of the demised
premises after having given notice of its exercise of the option stated in
Article 23 hereof to succeed to the interest of the Landlord under this Lease.

29.8 Representation of Authority. By his execution hereof each of the
signatories on behalf of the respective parties hereby warrants and represents
to the other that he is duly authorized to execute this Lease on behalf of such
party. If Tenant is a corporation, Tenant hereby appoints the signatory whose
name appears below on behalf of Tenant as Tenant's attorney-in-fact for the
purpose of executing this Lease for and on behalf of Tenant.

29.9 Expenses Incurred by Landlord Upon Tenant Requests. Tenant shall, upon
demand, reimburse Landlord for all reasonable expenses, including, without
limitation, legal fees, incurred by Landlord in connection with all requests by
Tenant for consents, approvals or execution of collateral documentation related
to this Lease, including, without limitation, costs incurred by Landlord in the
review and approval of Tenant's plans and specifications in connection with
proposed alterations to be made by Tenant to the premises, requests by Tenant to
sublet the premises or assign its interest in the Lease, the execution by
Landlord of estoppel certificates requested by Tenant, and requests by Tenant
for Landlord to execute waivers of Landlord's interest in Tenant's property in
connection with third party financing by Tenant. Such costs shall be deemed to
be additional rent under the Lease.

29.10 Survival. Without limiting any other obligation of the either party which
may survive the expiration or prior termination of the term of the Lease, all
obligations (if any) on the part of each party to indemnify, defend, or hold the
other party harmless, as set forth in this Lease (including, without limitation,
Tenant's obligations under Articles 13(d), 15.3, and 29.3) shall survive the
expiration or prior termination of the term of the Lease.

         IN WITNESS WHEREOF the parties hereto have executed this Indenture of
Lease in multiple copies, each to be considered an original hereof, as a sealed
instrument on the day and year noted in Exhibit 1 as the Execution Date.

LANDLORD:                                             TENANT:
METROPOLITAN LIFE INSURANCE COMPANY         SERVICESOFT TECHNOLOGIES, INC.
On behalf of a co-mingled separate
account
<PAGE>   53
By: SSR Realty Advisors, Inc.,
    its Investment Advisor

By: : /s/ JOHN F. LOEHR                     By: /s/ ILLEGIBLE
      -------------------------------          --------------------------------
      (Name) (Title)                           (Name) (title)
       Hereunto Duly Authorized               Hereunto Duly Authorized
       Date Signed:                           Date Signed:

JOHN F. LOEHR
MANAGING DIRECTOR
<PAGE>   54
         IF TENANT IS A CORPORATION, A SECRETARY'S OR CLERK'S CERTIFICATE OF THE
AUTHORITY AND THE INCUMBENCY OF THE PERSON SIGNING ON BEHALF OF TENANT SHOULD BE
ATTACHED.

COMMONWEALTH, DISTRICT OR
STATE OF MASSACHUSETTS
COUNTY OF MIDDLESEX

         On the Execution Date stated in Exhibit 1, the person above signing
this Lease for and on behalf of the Tenant, to me personally known, did sign and
execute this Lease and, being by me duly sworn, did depose and say that he is
the officer of the above named Tenant, as noted, and that he signed his name
hereto by order of the Board of Directors of said Tenant.

                                                   /s/ ILLEGIBLE
                                                  -----------------------------
                                                  Notary Public
                                                  My Commission Expires:
                                                  June 23, 2000
<PAGE>   55
STATE OF NEW YORK

COUNTY OF WESTCHESTER

         On the Execution Date stated in Exhibit 1, the person above signing
this Lease for and on behalf of Landlord to me personally known, did sign and
execute this Lease and, being by me duly sworn, did depose and say that he is
the duly authorized representative of Landlord.

                                          /s/ RENEE S. PATRICK
                                          -------------------------------------
                                          Notary Public
                                          My Commission Expires: 11-17-99

                                          RENEE S. PATRICK
                                          Notary Public, State of New York
                                          #01PA5088169 Qualified in Westchester
                                          County
                                          Commission Expires on 11/17/1999
<PAGE>   56
                                    EXHIBIT 3

                             BUILDING STANDARD ITEMS

         The following exhibit sets forth the Building standard level of
leasehold improvements and does not, notwithstanding anything to the contrary in
this Exhibit 3 contained, impose any obligation on Landlord to provide any such
items in the premises.

A.       Exterior Walls, Lobby Walls and Core Walls

         1.       Finish

                  The exposed surfaces are to receive a drywall finish. The
toilet room walls are to be finished with ceramic tile and drywall, or equal.

         2.       Doors-Frames

                  Flush hollow metal doors or solid core wood doors 1-3/4" in
thickness will be installed in pressed metal door frames.

         3.       Hardware

                  Each swing door shall be provided with one and one-half pairs
of butts, a latch set, or lockset where required, and a door stop where
required. A surface mounted door closer will be provided at such additional
locations as may be required by the local code. All hardware shall be Sargent,
Schlage, Yale and Towne or equal.

B.       Partitions and Doors

         1.       Partitions Separating Premises (Demising)

                  a.       Partitions

                           Partitions separating premises shall be constructed
of metal studs with two layers of 5/8" wallboard on each side extending above
the ceiling, with one layer of wallboard on each side extended to the underside
of the floor construction above, or equal.

                  b.       Doors

                           All doors shall have pressed metal door frames or
wood door frames and casings, as Landlord may elect. The doors shall be solid
core wood doors and shall be provided with two pairs of butts, a lockset, and
doorstop where required. A door closer will be provided for the principal
entrance to the premises and at such additional locations as may be required by
the local code. The locksets which are provided at the entrance will be
master-keyed to building standard and shall be Sargent, Yale and Towne, Schlage
or equal.

         2.       Partitions Separating Offices within Single Premises

                  a.       Partitions
<PAGE>   57
                  The partitions shall be constructed of metal studs with one
layer of 5/8" wallboard on each side or equal.

                  b.       Doors

                  The swing doors shall have pressed metal door frames or wood
frames and casings, as Landlord may elect. The doors shall be solid core and
shall be provided with two pairs of butts, latch sets, and doorstop where
required. The number of doors shall not exceed one door for each 25 lineal feet
of allowed partitions. All hardware shall be Sargent, Yale and Towne, Schlage or
equal.

                  3.       Standard Quality of Partitions

                  The total lineal footage of partitions shall not exceed one
lineal foot for each 15 square feet of (i) Net Rentable Area (1) for
multi-tenant floors or (ii) Gross Area (1), not including building core area,
for single-tenant floors.

         C.       Ceilings

                  1. Mechanically suspended, 24" x 24" exposed slotted tee
system with fissured acoustic ceiling tiles, Class "A" (incombustible), 24" x
24", square edged.

                  2. The mechanical suspension system shall be of the concealed
type.

         D.       Lighting

                  1. At Landlord's election, either: (i) recessed 18 cell
parabolic lighting fixtures (2' x 4') with three (3) 35-watt rapid start tubes
to the extent of one such fixture per 85 square feet (average) of (x) New
Rentable Area for multi-tenant floors or (y) Gross Area, excluding core area,
for single-tenant floor, or (ii) a (1' x 4') recessed fluorescent lighting
fixture with two (2) 35-watt rapid start tubes to the extent of one such fixture
per seventy (70) square feet (average) of (x) New Rentable Area for multi-tenant
floors or (y) Gross Area 1, excluding core area, for single-tenant floors, shall
be installed by Landlord. Where required by design conditions, smaller recessed
florescent fixtures may be substituted at Landlord's option.

                  2. Miscellaneous fixtures, fluorescent and/or incandescent,
shall be installed in mechanical spaces, toilet areas, stairwell and utility
areas to conform to building operation requirements and existing codes.

                  3. Wall switches of the single pole, quiet type to the extent
of one switch for each ten lighting fixtures averaged shall be installed by
Landlord. Each private office shall have at least one wall switch (which will be
counted in the allowance).

--------

1        The terms "Gross Area" and "Net Rentable Area" used in computing
         allowances under this Exhibit 3 refer to definitions appearing in
         Article 7 of the Lease.
<PAGE>   58
         E.       Electrical and Telephone

                  1. Duplex wall base and floor receptacles (not to exceed one
per 125 square feet of (i) Net Rentable Area for multi-tenant floors or (ii)
Gross Area, not including building core area, for single-tenant floors) shall be
installed by Landlord. It is understood that not more than 10% of the total
number of such receptacles may be located in the floor.

                  2. Landlord will make the necessary provisions for wall and
baseboard telephone outlets (not to exceed one per 200 square feet of (i) Net
Rentable Area for multi-tenant floors or (ii) Gross Area, not including building
core area, for single-tenant floors). Installation of the wiring by the
telephone company is the responsibility of Tenant. It is understood that not
more than 10% of the total number of such outlets may be located in the floor.

                  3. Power wiring circuits, including terminal device (208 Volt,
3 Phase, grounded) shall be made available to Tenant as may be agreed between
the parties in connection with Tenant equipment at the rate of one per 6,000
square feet of (i) Net Rentable Area for multi-tenant floors or (ii) Gross Area,
not including building core area, for single tenant floors.

         F.       Plumbing

                  1. Wet stacks will be available on the typical office floor
containing cold water, waste, and vents. Tenant equipment can be connected at
these points by the Landlord at the Tenant's expense.

         G.       Painting and Wall Covering

                  1. All wall surface shall receive a finish coat of building
standard Polomyx paint over one prime coat, or equal, as Landlord may elect.
Doors and frames shall receive one coat of enamel over one prime coat or shall
have a natural finish of one coat of sealer and one coat of varnish.

                  2. Paint colors shall be selected from the building standard
color chart with not more than one accent color (flat paint) on one wall in each
individual office.

                  3. Where Tenant desires wall covering, Landlord shall
initially prepare walls to receive wall covering as designated by Tenant. Such
wall covering shall be furnished and installed at Tenant's expense.
Wall covering shall be subject to Landlord's approval prior to installation.

                  4. Public areas, corridors and lobbies shall be finished in
accordance with the Landlord's Architect's schedule of room finish.

         H.       Sun-Control Blinds

         Landlord shall furnish and install sun-control blinds or drapes,
including the tracks therefor, in colors selected by Landlord.

         I.       Mechanical
<PAGE>   59
                  1. Landlord will install one thermostat for every four
perimeter units in premises served by the Building perimeter system.

                  2. Landlord will install one supply diffuser with 6 feet of
flexible hose for every 200 square feet of (i) Net Rentable Area for
multi-tenant floors or (ii) Gross Area, not including core area, for
single-tenant floors in any premises served by the Building central air
distribution system.

                  3. Landlord will install a sprinkler system for the public
areas and tenant premises to the extent of one head per 225 square feet of (i)
Net Rentable Area for multi-tenant floors or (ii) Gross Area, not including
building core area, for single-tenant floors.

                  Such head shall be a chrome pendant head. Heads will be
installed in accordance with approved Tenant's final plans and all other
governing agencies and regulations.
<PAGE>   60
                                    EXHIBIT B

                            FORM OF LETTER OF CREDIT

                          ______________________________
                         [Name of Financial Institution]

                                          Irrevocable Standby
                                          Letter of Credit
                                          No.___________________________________
                                          Issuance Date: _______________________
                                          Expiration Date:______________________

Applicant: Servicesoft Technologies, Inc.

Beneficiary

Metropolitan Life Insurance Company
c/o SSR Realty Advisors, Inc.
One North Broadway, Suite 500
White Plains, New York 10601
Attn: Director of Asset Management

Ladies/Gentlemen:

We hereby establish our Irrevocable Standby Letter of Credit in your favor for
the account of the above referenced Applicant in the amount of One Hundred
Sixty-Five Thousand Six Hundred Twenty-Four and 99/100 ($165,624.99) U.S.
Dollars available for payment at sight by your draft drawn on us when
accompanied by the following documents:

1. An original copy of this Irrevocable Standby Letter of Credit.

2. Beneficiary's dated statement purportedly signed by one of its officers
reading: "This draw in the amount of __________________($_______________) U. S.
Dollars under your Irrevocable Standby Letter of Credit No.
___________________________ represents funds due and owing to us as a result of
the Applicant's failure to comply with one or more of the terms of that certain
lease by and between Metropolitan Life Insurance Company, as landlord, and
Servicesoft Technologies, Inc., as tenant."

         It is a condition of this Irrevocable Standby Letter of Credit that it
will be considered automatically renewed for a one year period upon the
expiration date set forth above and upon each anniversary of such date, unless
at least sixty (60) days prior to such expiration date or applicable anniversary
thereof, we notify you in writing by certified mail, return receipt requested,
that we elect not to so renew this Irrevocable Standby Letter of Credit. A copy
of any such notice shall also be sent to: Metropolitan Life Insurance Company,
c/o SSR Realty Advisors, Inc., One North Broadway, Suite 500, White Plains, New
York 10601, Attn: Legal Department. In addition, provided that you have not
provided us with written notice of Applicant's default under the above
referenced lease prior to the effective date of any reduction, the amount of
this Irrevocable Standby Letter of Credit shall automatically reduce in
accordance with the following schedule:
<PAGE>   61
<TABLE>
<CAPTION>

Effective Date of Reduction                     New Reduced Amount of Letter
                                                of Credit
<S>                                             <C>
[     ] (the thirtieth (30th) month after       Fifty-Five Thousand Two
         the Term Commencement Date)            Hundred Eight and 33/100
                                                ($55,208.33) U.S. Dollars
</TABLE>

In addition to the foregoing, we understand and agree that you shall be entitled
to draw upon this Irrevocable Standby Letter of Credit in accordance with 1. and
2. above in the event that we elect not to renew this Irrevocable Standby Letter
of Credit and, in addition, you provide us with a dated statement purportedly
signed by one of Beneficiary's officers stating that the Applicant has failed to
provide you with an acceptable substitute irrevocable standby letter of credit
in accordance with the terms of the above referenced lease. We further
acknowledge and agree that: (a) upon receipt of the documentation required
herein, we will honor your draws against this Irrevocable Standby Letter of
Credit without inquiry into the accuracy of Beneficiary's signed statement and
regardless of whether Applicant disputes the content of such statement; (b) this
Irrevocable Standby Letter of Credit shall permit partial draws and, in the
event you elect to draw upon less than the full stated amount hereof, the stated
amount of this Irrevocable Standby Letter of Credit shall be automatically
reduced by the amount of such partial draw; and (c) you shall be entitled to
assign your interest in this Irrevocable Standby Letter of Credit from time to
time without our approval and without charge. In the event of an assignment, we
reserve the right to require reasonable evidence of such assignment as a
condition to any draw hereunder.

This Irrevocable Standby Letter of Credit is subject to the Uniform Customs and
Practice for Documentary Credits (1993 revision) ICC Publication No. 500.

We hereby engage with you to honor drafts and documents drawn under and in
compliance with the terms of this Irrevocable Standby Letter of Credit.

All communications to us with respect to this Irrevocable Standby Letter of
Credit must be addressed to Metropolitan Life Insurance company, SSR Realty
Advisors, Inc., One North Broadway, Suite 500, White Plains, New York 10601,
Attn: Director of Asset Management.

                                                Very truly yours,

                                                ----------------------------

                                                ----------------------------
                                                          [name]

                                                ----------------------------
                                                          [title]
<PAGE>   62
                                    EXHIBIT 4

                               THE DAVIS COMPANIES

                             Cleaning Specifications

                                  OFFICE AREAS

A. DAILY ON BUSINESS DAYS

         1. Empty and clean all waste receptacles and remove waste material from
the premises: change waste basket liners as necessary.

         2. Sweep and wash all uncarpeted areas.

         3. Vacuum carpeting and rugs in all traffic and main areas. Check for,
and vacuum all obvious debris under desks, behind barrels, etc.

         4. Spot clean glass on tenant entrance doors and interior glass
partitions.

         5. Spot clean by damp wiping fingerprints, smears and smudges on walls,
doors, frames, kick and push plates, handles, and light switches.

         6. Clean spots and stains on rug and V.C.T.

         7. Damp wipe all Formica counter tops, sinks, and table tops.

         8. Wash clean all water fountains and adjacent floor area.

         9. Wipe clean all brass and other bright work.

         10. Remove all finger marks from private doors, light switches, and
doorways.

         11. Upon completion of cleaning all lights will be turned off, doors
locked, and alarms engaged if applicable, leaving the premises in an orderly
condition.
<PAGE>   63
                                EXHIBIT 4 (con't)

                                       -2-

B. TWICE WEEKLY.

         1. Thoroughly vacuum all carpeted areas including edges and corners.

         2. Hand dust and wipe clean with treated clothes, all horizontal
surfaces, including furniture, office equipment, window sills, door ledges,
chair rails and counter tops, within normal reach.

         3. Move and dust under all lightweight desk equipment and telephones
and replace same.

         4. Hand dust grill work.

C. WEEKLY

         1. Wash all glass at tenant entrance doors.

         2. Wash all glass tenant entrance sidelights.

         3. Dust all closet shelving, coat racks, etc.

         4. Brush and hand dust all carpet edges and other areas inaccessible to
vacuum attachments.

         5. Brush seat cushions on chairs, sofas, etc.

         6. Dust all ventilating and air conditioning louvers and grills.

D. MONTHLY

         1. Render high dusting not reached in nightly cleaning to include:

            a) dusting of all pictures, frames, charts, graphs, and
similar wall

            b) dusting of all vertical surfaces, such as walls,
partitions, doors and door frames, etc.

            c) dusting of all pipes, ducts, and high moldings; and
<PAGE>   64
                                EXHIBIT 4 (con't)

            d) dusting of all Venetian blinds. hangings;

         2. Move and vacuum clean underneath all furniture that can reasonably
be moved.

         3. Spray buff all resilient floors.

E. SEMI-ANNUALLY

         1. Strip and wax all resilient floors

                                   LAVATORIES

A. DAILY ON BUSINESS DAYS

         1. Sweep wash and rinse all floors thoroughly, using, a disinfectant.

         2. Wash all basins, bowls, urinals, and shower stalls.

         3. Empty and clean paper towel and sanitary disposal receptacles.
Replace liners back into receptacles. All liners to be provided by landlord.

         4. Refill tissue holders, soap dispensers, towel dispensers and
sanitary dispensers. Materials are to be furnished by the landlord.

         5. A non-acidic sanitizing solution will be used in all lavatory
cleaning.

         6. Wash and polish all mirrors, powder shelves, brightwork,
flushometers, piping and toilet seat hinges, etc.

         7. Wash both sides of all toilet seats.

         8. Dust all partitions, tile walls, dispensers, and receptacles.

         9. Remove waste paper and refuse to designated areas on the premises.
<PAGE>   65
                                EXHIBIT 4 (con't)

                                       -4-

B.       WEEKLY

         1. Wash all partitions and walls.

         2. Vacuum all air vents.

         3. Wipe down all high light fixtures.

         4. Flush floor drains with disinfectant.

         5. Check and refill, if necessary, all automatic deodorizing equipment.

C. MONTHLY

         1.  Machine scrub floors.

                                    ELEVATORS

A. DAILY ON BUSINESS DAYS

         1. Clean interior walls, doors, and bright work, including ceiling.

         2. Vacuum floors.

         3. Clean door sills or tracks.

         4. Clean exterior elevator doors, and frames.
<PAGE>   66
                                EXHIBIT 4 (con't)

               LOBBIES, COMMON AREAS AND FRONT CARPETED STAIRCASE

A. DAILY ON BUSINESS DAYS

         1. Empty all waste baskets and change liners, empty cigarette urns, and
ash trays. Remove waste material from premises.

         2. Vacuum rugs mats and carpeted areas.

         3. Inspect carpet for spots and stains, removing where possible.

         4. Spot clean all interior glass in partitions and doors.

         5. Clean and sanitize drinking fountains.

         6. Damp mop tile lobby floor; after mopping thoroughly utilize a wetvac
to remove excess water and dirt.

         7. Clean entrance glass doors on lobby floor both sides.

         8. Hand dust and wipe clean with treated cloths all furniture, window
sills, railings, and planters.

         9. Dust and wash all director boards.

         10. Spot clean by damp wiping fingerprints, smears, smudges on walls,
doors and frames.

         11. Clean any and all metal work inside lobby.

         12. Clean any and all metal work surrounding building entrance doors.

         13. Sweep main stairwell and dust handrails.
<PAGE>   67
                                EXHIBIT 4 (con't)

B. WEEKLY

         1. Dust all artwork.

         2. Dust air vents.

C. MONTHLY

         1. Machine scrub brick or granite lobby floor.

         2. Dust above hand height all surfaces, including light fixtures
with reach of a step ladder.

         3. Wash all boards.

         4. Dust all air grills and/or heating units and vacuum.

         5. Damp mop secondary staircase flooring.

         6. Dust fire extinguishers and hose cabinets.

         7. Spray buff resilient floors.

D. QUARTERLY

         1  Strip and wax all resilient floors.

         2. Shampoo all common area carpeting.
<PAGE>   68
                                EXHIBIT 4 (con't)

                                  MISCELLANEOUS

A. DAILY

         1. Change light bulbs as necessary.

         2. Report all maintenance deficiencies to building management i.e.,
inoperable light fixture, plumbing problems, roof leaks, etc.

B. WEEKLY

         1. Sweep, mop, or vacuum secondary stairs.

         2. Check supplies and order as necessary.

C. MONTHLY

         1. Inspect and clean all utility closets.

         2. Shampoo elevator carpets, more frequently if necessary.

Should a tenant instruct a cleaner to do other than those duties specified
herein, i.e. leave lights on, leave doors open, leave alarms off, don't vacuum,
etc., the cleaner must report this to the cleaning supervisor who will obtain
the tenant's name and, in turn, report this information to the Glen Management
Tenant Service Coordinator on the following business day.

The cleaner's duty at all times is to locate unclean conditions and correct
them.
<PAGE>   69
                                EXHIBIT 4 (con't)

                               THE DAVIS COMPANIES

                         Daily Day Porter Specifications

*Check and clean all common areas as needed

*Sweep, mop, and vacuum main lobby floor as necessary

*Clean main lobby glass and bright work as necessary

*Dust horizontal surfaces, woodwork, artwork, etc., in main lobby is
 necessary

*Check all restrooms throughout building to ensure sufficient supply of paper
 products, soap, deodorizers, etc., and clean as necessary

*Clean elevators as necessary, wipe, vacuum, etc.

*Change common area light bulbs as necessary

*Spread ice melt on all building walks and entrances as needed

*Police building exterior for debris

*Empty common area ash urns and barrels as necessary

*Respond to tenant and management requests as needed

*Report building deficiencies, i.e., lighting, plumbing, leaks, etc.,
 promptly to building management

*Provide emergency assistance as needed

The Day Porter's duty is to support nightly cleaning operations and must make it
his/her business to locate unclean conditions and correct them.
<PAGE>   70
                                                              EXHIBIT 5, SHEET 1

[LETTERHEAD - VINICK & CAULFIELD ASSOCIATES, INC.]

Project Name:     Servicesoft

                  Apple Hill

Re:               Outline of Tenant Improvements

OVERVIEW

         The intent is to maintain virtually all of the existing. New walls are
added to create multi-tenant lobby, tenant demise and few interior spaces.

         The new work should conform to the existing similar construction or
building standard. Items perceived as "upgrades" are limited to new tenant
entrance constructed of wood and glass. Wood and glass would also be considered
at the new large Conference/Boardroom off the elevator lobby. An enlarged
Lunchroom is anticipated.

         Servicesoft would be installing now movable workstations that in all
likelihood would require new locations of electric and tel/data connections.

         Existing ceilings remain. Exit lights will require modifications due to
new workstation Layout. Lights will be reconfigured in the new Boardroom and a
few wall washers added.

         Existing flooring to remain, be patched and cleaned as required. Areas
such as the Lunchroom will require additional VCT.

         Appliances for Lunchroom will be new. Additional counters and cabinets
are required for Lunchroom. Note, the new perimeter Lunchroom will require
review of the HVAC system. The increase of population and equipment in this
localized area should focus on limiting the migration of food odors and
satisfying the BTU loads.

         Computer/Communications-Networkroom will require 24-hour cooling.

         Fire Alarm/Life Safety devices would need to be addressed as required
by new work.

         A new coat of paint throughout would be required.
<PAGE>   71
                               EXHIBIT 5, SHEET 2

Project Name:     Servicesoft

                  Apple Hill

Re:               Outline of Tenant Improvements

OVERVIEW

         The intent is to maintain virtually all of the existing. New walls are
added to create multi-tenant lobby, tenant demise and few interior spaces.

         The new work should conform to the existing similar construction or
building standard. Items perceived as "upgrades" are limited to new tenant
entrance constructed of wood and glass. Wood and glass would also be considered
at the new large Conference/Boardroom off the elevator lobby. An enlarged
Lunchroom is anticipated.

         Servicesoft would be installing new movable workstations that in all
likelihood would require new locations of electric and tel/data connections.

         Existing ceilings remain. Exit lights will require modifications due to
now workstation Layout. Lights will be reconfigured in the new Boardroom and a
few wall washers added.

         Existing flooring to remain, be patched and cleaned as required. Areas
such as the Lunchroom will require additional VCT.

         Appliances for Lunchroom will be new. Additional counters and cabinets
are required for Lunchroom. Note, the new perimeter Luncbroom will require
review of the HVAC system. The increase of population and equipment in this
localized area should focus on limiting the migration of food odors and
satisfying the BTU loads.

         Computer/Communications-Networkroom will require 24-hour cooling.

         Fire Alarm/Life Safety devices would need to be addressed as required
by new work.

         A new coat of paint throughout would be required.
<PAGE>   72
RIDER TO LEASE

The subject Lease is hereby amended as follows:

1.       SECURITY DEPOSIT

         A.  Tenant shall, at the time that Tenant executes and delivers
this Lease to Landlord, pay to Landlord a Security Deposit ("Security Deposit")
in the amount of One Hundred Sixty-Five Thousand Six Hundred Twenty-Four and
99/100 ($165,624.99) securing Tenant's obligations under this Lease. In no event
shall said Security Deposit be deemed to be a prepayment of rent nor shall it be
considered a measure of liquidated damages. Tenant agrees that no interest shall
accrue on said deposit and that Landlord shall have no obligation to maintain
such deposit in a separate account (i.e. Landlord shall have the right to
commingle such deposit with other funds of Landlord). In the event that Tenant
shall default (beyond the expiration of any applicable cure periods as set forth
in Article 21.7 of the Lease) in any of its obligations under the Lease,
Landlord shall have the right, without prior notice to Tenant, to apply said
deposit (or any portion thereof) towards the cure of any such default and Tenant
shall promptly, upon notice from Landlord, pay to Landlord any amount so applied
by Landlord in order to restore the full amount of said deposit. In addition, in
the event of a termination based upon the default of Tenant under the Lease, or
a rejection of the Lease pursuant to the provisions of the Federal Bankruptcy
Code, Landlord shall have the right to apply said Security Deposit (from time to
time, if necessary) to cover the full amount of damages and other amounts due
from Tenant to Landlord under the Lease. Any amounts so applied shall, at
Landlord's election, be applied first to any unpaid rent and other charges which
were due prior to the filing of the petition for protection under the Federal
Bankruptcy Code. The application of all or any part of the deposit to any
obligation or default of Tenant under this Lease shall not deprive Landlord of
any other rights or remedies Landlord may have nor shall such application by
Landlord constitute a waiver by Landlord. Provided that Tenant has never been in
default (beyond the expiration of applicable cure periods set forth in Article
21.7 of the Lease) in any of its obligations under the Lease prior to the date
("Reduction Date") thirty (30) months after the Term Commencement Date, Landlord
shall, within ten (10) days of written request made by Tenant after the
Reduction Date, refund to Tenant One Hundred Ten Thousand Four Hundred Sixteen
and 66/100 ($110,416.66) Dollars of said Security Deposit, thereby reducing the
Security Deposit to Fifty-Five Thousand Two Hundred Eight and 33/100
($55,208.33) Dollars. Provided that Tenant is not in default of any of its
obligations under the Lease at the expiration of the term of the Lease, Landlord
shall refund to Tenant any portion of said Security Deposit which Landlord is
then holding.

         B.   All or part of the Security Deposit may be in the form of an
irrevocable letter of credit (the "Letter of Credit"), which Letter of Credit
shall: (a) be in the initial amount of $165,624.99; (b) be in the form attached
to the Lease as Exhibit 4; (c) name Tenant fails to give timely notice, as
aforesaid, Tenant shall have no further right to extend the term of this Lease,
time being of the essence of this Paragraph 2.
<PAGE>   73
B. Yearly Rent

         The Yearly Rent during the additional term shall be based upon the Fair
Market Rental Value, as defined in Paragraph 3 of this Rider, as of the
commencement of the additional term, of the premises then demised to Tenant,
provided however, that in no event shall the sum of Yearly Rent, Operating
Expense Excess and Tax Excess payable by Tenant for any twelve-(12)-month period
during the additional term be less than the sum of Yearly Rent, Operating
Expense Excess and Tax Excess payable by Tenant in respect of the
twelve-(12)-month period immediately preceding the commencement of the
additional term.

C. Notwithstanding anything to the contrary herein or in the Lease contained, in
the event that Tenant timely exercises its option to extend the term of the
Lease pursuant to this Paragraph 2, Landlord shall contribute to Tenant up to
$2.00 per square foot of Total Rentable Area ("Landlord's Refurbishment
Allowance") towards the costs incurred by Tenant in refurbishing the premises
during said additional term of the Lease ("Tenant's Refurbishment Work").
Tenant's Refurbishment Work shall be performed in accordance with Articles 12
and 13 of the Lease. Provided that Tenant is not in default of its obligations
under the Lease at the time that Tenant requests any requisition on account of
Landlord's Refurbishment Allowance, Landlord shall pay the cost of the work
shown on each requisition (as hereinafter defined) submitted by Tenant to
Landlord within thirty (30) days of submission thereof by Tenant to Landlord.
For the purposes hereof, a "requisition" shall mean written documentation
(including, without limitation, invoices from Tenant's contractor, written lien
waivers and such other documentation as Landlord may reasonably request) showing
in reasonable detail the costs of the improvements installed by Tenant to date
in the premises. Each requisition shall be accompanied by evidence reasonably
satisfactory to Landlord that all work covered by previous requisitions has been
fully paid by Tenant. Landlord shall have the right, upon reasonable advance
notice to Tenant, to inspect Tenant's books and records relating to each
requisition in order to verify the amount thereof. Tenant shall submit
requisition(s) no more often than monthly.

         Notwithstanding anything to the contrary herein contained:

         (i) Landlord shall have no obligation to advance funds on account of
Landlord's Refurbishment Allowance unless and until Landlord has received the
requisition in question, together with the certifications required by
Subparagraph C. hereof, certifying that the work shown on the requisition has
been performed in accordance with applicable law and in accordance with Tenant's
plans.

         (ii) Except with respect to work and/or materials previously paid for
by Tenant, as evidenced by paid invoices and written lien waivers provided to
Landlord, Landlord shall have the right to have Landlord's Refurbishment
Allowance paid to both Tenant and Tenant's contractor(s) and vendor(s) jointly,
or directly to Tenant's contractor if Landlord has reason to believe there are
or may be outstanding claims by such contractor(s) or vendor(s).
<PAGE>   74
         (iii) Landlord shall have no obligation to pay Landlord's Refurbishment
Allowance in respect of any requisition submitted prior to the commencement of
the additional term or later than the date six (6) months after the commencement
of the additional term.

         (iv) Tenant shall not be entitled to any unused portion of Landlord's
Refurbishment Allowance.

         D. Notwithstanding the fact that upon Tenant's exercise of the herein
option to extend the term of the Lease such extension shall be self-executing,
as aforesaid, the parties shall promptly execute a lease amendment reflecting
such additional term after Tenant exercises the herein option, except that the
Yearly Rent payable in respect of such additional term may not be set forth in
said amendment. Subsequently, after such Yearly Rent is determined, the parties
shall execute a written agreement confirming the same. The execution of such
lease amendment shall not be deemed to waive any of the conditions to Tenant's
exercise of its rights under this Paragraph 2, unless otherwise specifically
provided in such lease amendment.

         E. Tenant shall have no further option to extend the term of the Lease
other than the one (1) additional five (5) year term herein provided.

3. DEFINITION OF FAIR MARKET RENTAL VALUE

         For the purposes of this Rider:

         A. "Fair Market Rental Value" shall be computed as of the date in
question at the then current annual rental charge (i.e., the sum of Yearly Rent
plus escalation and other charges), including provisions for subsequent
increases and other adjustments for leases or agreements to lease then currently
being negotiated (i.e. as evidenced by executed letters of intent) or executed
within the previous six month period in comparable space located in the
Building, or if no leases or agreements to lease were being negotiated (i.e. as
evidenced by executed letters of intent) or executed in the Building within such
six month period, the Fair Market Rental Value shall be determined by reference
to leases or agreements to lease then currently being negotiated (i.e. as
evidenced by executed letters of intent) or executed for comparable space
located elsewhere in first-class office buildings located in the
Natick/Framingham suburban area within the previous six month period. In
determining Fair Market Rental Value, the following factors, among others, shall
be taken into account and given effect: size, location of premises, lease term,
condition of building, services provided by the Landlord, and the fact that
Landlord is required to provide Landlord's Refurbishment Allowance to Tenant in
connection with Tenant's exercise of its extension option.

         B. Operating Costs in the Base Year shall be equal to the actual amount
of Operating Costs for the Operating Year immediately preceding the effective
date of determination of such Fair Market Rental Value, and the Tax Base shall
equal the actual amount of Taxes for the last fiscal/tax year for which actual
data is available.

         C. Dispute as to Fair Market Rental Value
<PAGE>   75
         Landlord shall initially designate Fair Market Rental Value and
Landlord shall furnish data in support of such designation. If Tenant disagrees
with Landlord's designation of a Fair Market Rental Value, Tenant shall have the
right, by written notice given within thirty (30) days after Tenant has been
notified of Landlord's designation, to submit such Fair Market Rental Value to
arbitration. Fair Market Rental Value shall be submitted to arbitration as
follows: Fair Market Rental Value shall be determined by impartial arbitrators,
one to be chosen by the Landlord, one to be chosen by Tenant, and a third to be
selected, if necessary, as below provided. The unanimous written decision of the
two first chosen, without selection and participation of a third arbitrator, or
otherwise, the written decision of a majority of three arbitrators chosen and
selected as aforesaid, shall be conclusive and binding upon Landlord and Tenant.
Landlord and Tenant shall each notify the other of its chosen arbitrator within
ten (10) days following the call for arbitration and, unless such two
arbitrators shall have reached a unanimous decision within thirty (30) days
after their designation, they shall so notify the President of the Boston Bar
Association (or such organization as may succeed to said Boston Bar Association)
and request him to select an impartial third arbitrator, who shall be an office
building owner or a real estate broker dealing with like types of properties, to
determine Fair Market Rental Value as herein defined. Such third arbitrator and
the first two chosen shall, subject to commercial arbitration rules of the
American Arbitration Association, hear the parties and their evidence and render
their decision within thirty (30) days following the conclusion of such hearing
and notify Landlord and Tenant thereof. Landlord and Tenant shall bear the
expense of the third arbitrator (if any) equally. The decision of the arbitrator
shall be binding and conclusive, and judgment upon the award or decision of the
arbitrator may be entered in the appropriate court of law (as identified on
Exhibit 1); and the parties consent to the jurisdiction of such court and
further agree that any process or notice of motion or other application to the
Court or a Judge thereof may be served outside the State wherein the Building is
situated by registered mail or by personal service, provided a reasonable time
for appearance is allowed. If the dispute between the parties as to a Fair
Market Rental Value has not been resolved before the commencement of Tenant's
obligation to pay rent based upon such Fair Market Rental offer such area for
lease to third parties). In no, event shall Tenant have any rights under this
Paragraph 4 on or after the date ("Last RFO Date") nine (9) months prior to the
expiration of the initial term of the Lease (i.e. Landlord shall have no
obligation to give Landlord's Notice, as hereinafter defined, to Tenant on or
after the date nine (9) months prior to the expiration of the initial term of
the Lease), except that if Tenant has previously timely and properly exercised
its right to extend the term of the Lease pursuant to Paragraph 2 of the Rider
to the Lease, then the Last RFO Date shall be the date nine (9) months prior to
the expiration of the additional term of this Lease .

B. Exercise of Right to Lease RFO Premises

         Landlord shall give to Tenant an offer to lease RFO Premises at such
time as Landlord determines, as aforesaid, that such RFO Premises will become
available for lease to Tenant. Landlord's Notice shall set forth the exact
location of the RFO Premises, Landlord's designation of the Fair Market Rental
Value of such RFO Premises, and the Specified, Commencement
<PAGE>   76
Date in respect of such RFO Premises. Tenant shall have the right, exercisable
upon written notice ("Tenant's Exercise Notice") given to Landlord within ten
(10) business days after the receipt of Landlord's Notice, to lease such RFO
Premises. If Tenant fails timely to give Tenant's Exercise Notice, Landlord
shall be free to lease such RFO Premises to any third party, and Tenant shall
have no further right to lease such RFO Premises pursuant to this Paragraph 4,
except as set forth in Subparagraph A of this Paragraph 4. Upon the timely
giving of such notice, Landlord shall lease and demise to Tenant and Tenant
shall hire and take from Landlord, such RFO Premises, upon all of the same terms
and conditions of the Lease except as hereinafter set forth.

         C. Lease Provisions Applying to RFO Premises

         The leasing to Tenant of such RFO Premises shall be upon all of the
same terms and conditions of the Lease, except as follows:

         (1) Term Commencement Date

         The Term Commencement Date in respect of such RFO Premises shall be the
later of: (x) the Specified Commencement Date in respect of such RFO Premises as
set forth in Landlord's Notice, or (y) the date that all occupants of such RFO
Premises vacate the RFO Premises and deliver them to Landlord.

         (2) Yearly Rent

         The Yearly Rent shall be based upon the Fair Market Rental Value, as
defined in Paragraph 3 of the Rider to this Lease, of such RFO Premises, as of
the Term Commencement Date in respect of such RFO Premises.

         (3) Condition of RFO Premises

Tenant shall take such RFO Premises "as-is" in its then (i.e. as of the date of
premises delivery) state of construction, finish, and decoration, without any
obligation on the part of Landlord to construct or prepare any RFO Premises for
Tenant's occupancy or to provide any Landlord construction allowance in respect
of the RFO Premises.

D. Execution of Lease Amendments

         Notwithstanding the fact that Tenant's exercise of the above-described
option to lease RFO Premises shall be self-executing, as aforesaid, the parties
hereby agree promptly to execute a lease amendment reflecting the addition of an
RFO Premises, except that the Yearly Rent payable in respect of such RFO
Premises may not be set forth in said amendment. Subsequently, after such Yearly
Rent is determined, the parties shall execute a written agreement confirming the
same. The execution of such lease amendment shall not be deemed to waive any of
the conditions to Tenant's exercise of the herein option to lease the RFO
Premises, unless otherwise specifically provided in such lease amendment.
<PAGE>   77
                                 Two Apple Hill
                              598 Worcester Street
                              Natick, Massachusetts
                                ("the Building")

                                 FIRST AMENDMENT
                                 October 8, 1999

              LANDLORD:                   Metropolitan Life Insurance Company

              TENANT:                     Servicesoft Technologies, Inc.

              EXISTING PREMISES:          An area on the third (3rd) floor of
                                          the Building, substantially as shown
                                          on Lease Plan, Exhibit 2, dated April
                                          9, 1999

ORIGINAL      LEASE EXECUTION DATE:       April 9, 1999
LEASE
DATA

              TERMINATION DATE:           June 30, 2004

              PREVIOUS LEASE AMENDMENTS:  Letter Agreement dated June 17, 1999

              FIRST AMENDMENT             An area on the third (3rd) floor of
              ADDITIONAL PREMISES:        the Building, consisting of 19,440
                                          square feet of Total Rentable Area,
                                          substantially as shown on Lease Plan,
                                          Exhibit 2, First Amendment, dated
                                          October 8, 1999, a copy of which is
                                          attached hereto and incorporated by
                                          reference herein

              EXTENDED TERMINATION
              DATE:                       July 31, 2005

         WHEREAS, Tenant desires to (i) extend the term of the lease; and (ii)
lease additional premises located in the Building, to wit, the First Amendment
Additional Premises;

         WHEREAS, Landlord is willing to (i) extend the term of the Lease and
(ii) lease the First Amendment Additional Premises to Tenant on the terms and
conditions hereinafter set forth;

         NOW THEREFORE, the parties hereby agree that the above-referenced lease
(the "Lease") is hereby amended as follows:
<PAGE>   78
EXTENSION OF TERM OF LEASE

         The term of the Lease is hereby extended for an additional period
commencing as of July 1, 2004 and terminating as of July 31, 2005. Said
additional term shall be upon the terms set forth on Revised Exhibit 1, First
Amendment, Sheets 1, 2 and 3, dated October 8, 1999, a copy of which is attached
hereto and incorporated by reference herein, and upon all of the other terms and
conditions of the Lease in effect immediately preceding the commencement of such
additional term (including, without limitation, Tenant's obligation to pay
Electricity Rent, pursuant to and in accordance with Article 8 of the Lease and
Tenant's Option to Extend the Term of the Lease, pursuant to Paragraph 2 of the
Rider to the Lease), except as set forth herein.

DEMISE OF THE FIRST AMENDMENT ADDITIONAL PREMISES

         Landlord hereby demises and leases to Tenant, and Tenant hereby hires
and takes from Landlord, the First Amendment Additional Premises for a term
commencing as of January 1, 2000 and terminating as of July 31, 2005. Said
demise of the First Amendment Additional Premises shall be upon the terms set
forth on Revised Exhibit 1, First Amendment, Sheets 1, 2 and 3, dated October 8,
1999, and upon all of the other terms and conditions of the Lease, including,
without limitation, Tenant's obligation to pay Electricity Rent in accordance
with Article 8 of the Lease), except as follows:

A. The Term Commencement Date in respect of the First Amendment Additional
Premises shall be January 1, 2000.

B. Commencing as of the Term Commencement Date in respect of the First Amendment
Additional Premises, Tenant shall pay Tax Excess and Operating Expense Excess in
respect of the First Amendment Additional Premises on a monthly estimated basis
based upon the most recent Tax and Operating Cost data available to Landlord.

C. Whereas, the First Amendment Additional Premises constitute the RFO Premises,
as defined in Paragraph 4 of the Rider to the Lease, said Paragraph 4 of the
Rider to the Lease is hereby deleted in its entirety and is of no further force
or effect.

D. In the event that any of the provisions of the Lease are inconsistent with
this Amendment or the state of facts contemplated hereby, the provisions of this
Amendment shall control.

CONDITION OF FIRST AMENDMENT ADDITIONAL PREMISES

         Notwithstanding anything to the contrary herein or in the Lease
contained, Tenant shall take the First Amendment Additional Premises "as-is", in
the condition in which the First Amendment Additional Premises are in as of the
Term Commencement Date in respect of the First Amendment Additional Premises,
without any obligation on the part of Landlord to prepare or construct the First
Amendment Additional Premises for Tenant's occupancy, and without any warranty
or representation on the part of Landlord as to the condition of the First
Amendment Additional Premises. In implementation of the foregoing, Article 4 of
the Lease shall have no applicability to the First Amendment Additional
Premises.

LANDLORD'S CONTRIBUTION

E. Landlord shall, in the manner hereinafter set forth, provide to Tenant Two
Hundred Thirty-Three Thousand Two Hundred Eighty and 00/100 ($233,280.00)
Dollars ("Landlord's Contribution") towards the cost of leasehold improvements
to be installed by Tenant in the First Amendment Additional Premises and towards
the cost of architectural and engineering fees incurred by Tenant in preparing
Tenant's plans ("Tenant's Work"). Provided that Tenant is not in default of its
obligations under the Lease at the time
<PAGE>   79
that Tenant requests any requisition on account of Landlord's Contribution,
Landlord shall pay the cost of the work shown on each requisition (as
hereinafter defined) submitted by Tenant to Landlord within fourteen (14) days
of submission thereof by Tenant to Landlord.

F. For the purposes hereof, a "requisition" shall mean written documentation
(including, without limitation, invoices from Tenant's contractor, written lien
waivers and such other documentation as Landlord may reasonably request
("Requisition"), showing in reasonable detail the total cost of leasehold
improvements installed by Tenant in the First Amendment Additional Premises.
Each Requisition shall be accompanied by certifications from Tenant, Tenant's
architect, and Tenant's contractor that the work performed has been performed in
accordance with applicable laws and in accordance with Tenant's approved plans,
and that the amount of Landlord's Contribution to be paid to Tenant does not
exceed the total cost of Tenant's Work. Landlord shall have the right, upon
reasonable advance notice to Tenant, to inspect Tenant's books and records
relating to each requisition in order to verify the amount thereof Tenant shall
submit requisition(s) no more often than weekly.

G. Notwithstanding anything to the contrary herein contained, Landlord shall
have no obligation to pay Landlord's Contribution unless and until Landlord has
received the Requisition, together with the certifications required by Paragraph
B hereof, certifying that the work shown on the Requisition has been performed
in accordance with applicable laws and in accordance with Tenant's plans.

H. Tenant's Work shall be performed in accordance with the provisions of the
Lease, including, without limitation, Articles 12 and 13 thereof.

I. Landlord shall have no obligation to pay Landlord's Contribution in respect
of any Requisition submitted by Tenant to Landlord after September 30, 2000.

REVISED EXHIBIT 1, FIRST AMENDMENT

         Effective as of January 1, 2000, Exhibit 1, Sheets 1, 2 and 3, dated
April 9, 1999 shall be deleted and Revised Exhibit 1, First Amendment, Sheets 1,
2 and 3, dated October 8, 1999 shall be substituted in its place.

SECURITY DEPOSIT/LETTER OF CREDIT

J. The parties acknowledge that Landlord is holding a cash Security Deposit in
the amount of One Hundred Sixty-Five Thousand Six Hundred Twenty-Four and 99/100
($165,624.99) pursuant to Subparagraph A of Paragraph 1 of the Rider to the
Lease.

K. Tenant shall, at the time that Tenant executes and delivers this First
Amendment to Landlord, pay to Landlord an additional security deposit
("Additional Security Deposit") in the amount of One Hundred Thirty-One Thousand
Two Hundred Twenty and 00/ 100 ($131,220.00) Dollars securing Tenant's
obligations in respect of the First Amendment Additional Promises. Tenant may
provide the Additional Security Deposit either in the form of a cash security
deposit or an additional letter of credit ("Additional Letter of Credit"). In
either event, the Additional Security Deposit shall be held by Landlord in
accordance with the terms and conditions of Paragraph 1 of the Rider to the
Lease, except that, as of the Reduction Date, as hereinafter defined, Landlord
shall, within ten (10) days of written request made by Tenant after the
Reduction Date, refund to Tenant Eighty-Seven Thousand Four Hundred Eighty and
00/100 ($87,480.00) Dollars, thereby reducing the Additional Security Deposit to
Forty-Three Thousand Seven Hundred Forty and 00/100 ($43,740.00) Dollars.

L. The parties hereby agree that the Reduction Date is June 30, 2002.
<PAGE>   80
OPERATING COSTS IN THE BASE YEAR

         Reference is made to the fact that the Operating Costs in the Base Year
in respect of the Existing Premises and First Amendment Additional Premises is
the actual amount of Operating Costs for the first Lease Year. The parties
hereby agree that, for the purposes of determining Operating Costs in the Base
Year, Operating Costs for the first Lease Year shall be equal to the sum of: (x)
13/24 multiplied by the actual amount of Operating Costs for calendar year 1999;
plus (y) 11/24 multiplied by the actual amount of Operating Costs for calendar
year 2000.

ADJUSTMENT IN RESPECT OF TOTAL RENTABLE AREA OF THE BUILDING

         The parties acknowledge that there has been an adjustment in the Total
Rentable Area of the Building so that the Total Rentable Area of the Building is
127,227 square feet. Therefore, the parties hereby agree that the Tenant's
Proportionate Share in respect of the Existing Premises is 19.94%.

As hereby amended, the Lease is ratified, confirmed and approved in all
respects.
<PAGE>   81
         EXECUTED under seal as of the date first above-written.

LANDLORD:                                            TENANT:
METROPOLITAN LIFE INSURANCE                          SERVICESOFT TECHNOLOGIES,
COMPANY                                              INC,

On behalf of a co-mingled separate account

By: SSR Realty Advisors, Inc., its Investment
 Advisor

By: /s/ILLEGIBLE                          By: /s/ILLEGIBLE
    -------------------------------          ----------------------------------
   (Name) (Title)                             (Name) (Title)
          Hereunto Duly Authorized                    Hereunto Duly Authorized

Date Signed: 11/17/99                     Date Signed: 11/10/99
<PAGE>   82
                   REVISED EXHIBIT 1, FIRST AMENDMENT, SHEET 1
                                 Two Apple Hill
                              598 Worcester Street
                              Natick, Massachusetts
                                (the "Building")

Execution Date:        October 8, 1999

Tenant:                Servicesoft Technologies, Inc.
                       (name)

                       a Delaware corporation
                       (description of business organization)

                       50 Cabot Street, Needham, Massachusetts 02194
                       (principal place of business - mailing address)

Landlord:              Metropolitan Life Insurance Company. Mailing Address: SSR
                       Realty Advisors, Inc,, One North Broadway, Suite 500,
                       White Plains, New York 10601, Attn: Director of Asset
                       Management. Additional Notice Address: SSR Realty
                       Advisors, Inc., One North Broadway, Suite 500, White
                       Plains, New York 10601, Attn: Legal Department.

Building:              The Building in the Town of Natick, Massachusetts, known
                       as Two Apple Hill, located at 598 Worcester Street.

Art. 2                    Existing Premises:      An area on the third (3rd))
                                                  floor of the Building
                                                  substantially as shown on
                                                  Lease Plan, Exhibit 2

                          First Amendment         An area on the third (3rd)
                          Additional Premises:    floor of the Building
                                                  substantially as shown on
                                                  Lease Plan, Exhibit 2, First
                                                  Amendment

Art. 3.1                  Term Commencement       January 1, 2000
                          Date in respect of
                          First Amendment
                          Additional Premises:

Art. 3.2                  Termination Date in     July 31, 2005
                          respect of all
                          premises:
<PAGE>   83
Art. 4.3                  Final Plans Date:       Not applicable

Art. 5                    Use of Premises:        General business offices

Art. 6                    Yearly Rent in respect of Existing Premises:
<TABLE>
<CAPTION>
                          Time Period             Yearly Rent                   Monthly Payment
                          ------------            -----------                   ---------------
<S>                                               <C>                           <C>
                          June 15, 1999 -         $672,225.68                   $56,018.79
                          June 14, 2002:

                          June 15, 2002 -         $687,592.52                   $58,132.71
                          June 14, 2003:

                          June 15, 2003 -         $710,276.04                   $59,189.67
                          June 14, 2005:
</TABLE>

                 Yearly Rent in respect of First Amendment Additional Premises:
<TABLE>
<CAPTION>

                          Time Period             Yearly Rent                   Monthly Payment
                          -----------             -----------                   ---------------
<S>                                               <C>                           <C>
                          January 1, 2000         $250,160.04                   $20,846.67
                          -  May 31, 2000:

                          June 1, 2000 -          $515,160.00                   $42,930.00
                          June 15, 2002:

                          June 1, 2002 -          $534,600.00                   $44,550.00
                          June 15, 2003:

                          June 16, 2003 -         $544,320.00                   $45,360.00
                          July 31, 2005:
</TABLE>

Art. 7                    Total Rentable Area in respect of:

                          Existing Premises:      25,367 square feet
                          First Amendment         19,440 square feet

                          Additional Premises:

                          TOTAL:                  44,807 square feet

                          Building Total          127,227 square feet
                          Rentable Area:
<PAGE>   84
Art. 8                    Electric current will be furnished by Landlord to
                          Tenant in respect of the Existing Premises and First
                          Amendment Additional Premises. In consideration of
                          Landlord providing electric current to Tenant during
                          the term of the Lease in respect of the Existing
                          Premises and First Amendment Additional Premises, in
                          accordance with Article 8.1, Tenant shall pay to
                          Landlord, as additional rent, at the same time and in
                          the same manner as Yearly Rent is paid under the
                          Lease, electricity rent in respect of the Existing
                          Premises and First Amendment Additional Premises
                          ("Electricity Rent") in the initial amount of
                          $56,008.80 per annum (i.e., a monthly payment of
                          $4,667.40), subject to increase in accordance with
                          Article 8.1(b).

Art. 9                    Operating and Tax Escalation in respect of Existing
                          Premises and First Amendment Additional Premises;

                          Operating Costs in      The sum of: (x) 13/24
                          the Base Year:          multiplied by the actual
                                                  amount of Operating Costs for
                                                  calendar year 1999; plus (y)
                                                  11/24 multiplied by the actual
                                                  amount of Operating Costs for
                                                  calendar year 2000.

                          Tax Base:               The actual amount of Taxes for
                                                  fiscal/tax year 2000 (i.e.,
                                                  July 1, 1999 - June 30, 2000)

                          Tenant's Proportionate Share in respect of:

                          Existing Premises:      19.94% First

                          Amendment Additional
                          Premises:               15.28%
                          TOTAL:                  35.22%

Art. 29.3                 Broker: Insignia/ESG, Inc.

Art. 29.5                 Arbitration:            Massachusetts Superior Court

                          Exhibit Dates:          Lease Plan, Exhibit 2, dated
                                                  April 9, 1999 and Lease Plan,
                                                  Exhibit 2, First Amendment
                                                  dated October 8, 1999

LANDLORD:                                         TENANT:
METROPOLITAN LIFE INSURANCE                       SERVICESOFT TECHNOLOGIES, INC.
<PAGE>   85
COMPANY
On behalf of a co-mingled separate
account
By: SSR Realty Advisors, Inc., its
Investment Advisor

By: /s/ILLEGIBLE                         By: /s/ILLEGIBLE
   ------------------------                  -------------------------
(Name)  (Title)                            (Name)   (Title)
        Hereunto Duly Authorized                    Hereunto Duly Authorized

Date Signed: 11/17/99                                Date Signed: 11/10/99
             ---------------                                     --------------<PAGE>   1
                                                                     EXHIBIT 4.4

                           INVESTORS' RIGHTS AGREEMENT

         THIS INVESTORS' RIGHTS AGREEMENT is made as of the 21st day of April,
1999 by and between HealthStream, Inc., a Tennessee corporation (the "Company")
and the investors listed on Schedule A hereto, each of which is herein referred
to as an "Investor."

                                    RECITALS

         WHEREAS, the Company and the Investors are parties to the Series B
Convertible Preferred Stock Purchase Agreement of even date herewith (the
"Series B Convertible Agreement");

         WHEREAS, in order to induce the Company to enter into the Series B
Convertible Agreement and to induce the Investors to invest funds in the Company
pursuant to the Series B Convertible Agreement, the Investors and the Company
hereby agree that this Agreement shall govern the rights of the Investors to
cause the Company to register shares of Common Stock issuable to the Investors
and certain other matters as set forth herein;

         NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

         1. REGISTRATION RIGHTS. The Company covenants and agrees as follows:

            1.1 Definitions. For purposes of this Section 1:

                (a) The term "Act" means the Securities Act of 1933, as amended.

                (b) The term "Holder" means any person owning or having the
            right to acquire Registrable Securities or any assignee thereof in
            accordance with Section 1.12 hereof.

                (c) The term "1934 Act" shall mean the Securities Exchange Act
            of 1934, as amended.

                (d) The term "register," "registered," and "registration" refer
            to a registration effected by preparing and filing a registration
            statement or similar document in compliance with the Act, and the
            declaration or ordering of effectiveness of such registration
            statement or document.

                (e) The term "Registrable Securities" means (i) the Common Stock
            issuable or issued upon conversion of the Series A or Series B
            Convertible Preferred Stock, and (ii) any Common Stock of the
            Company issued as (or issuable upon the conversion or exercise of
            any warrant, right or other security which is issued as) a dividend
            or other distribution with respect to, or in exchange for or in
            replacement of the shares referenced in (i) above, excluding in all
            cases, however, any Registrable Securities sold by a person in a
            transaction in which his rights under this Section 1 are not
            assigned.

                (f) The number of shares of "Registrable Securities then
            outstanding" shall be determined by the number of shares of Common
            Stock outstanding which are Registrable Securities , and the number
            of shares of Common Stock issuable pursuant to then exercisable or
            convertible securities which are Registrable Securities.

<PAGE>   2

                (g) The term "SEC" shall mean the Securities and Exchange
            Commission.

            1.2 Demand Registration.

                (a) At any time after the Company shall have consummated a firm
            commitment underwritten public offering of the Common Stock of the
            Company under the Act, the holders of Registrable Securities (i)
            constituting at least 30% of the total shares of Registrable
            Securities then outstanding and (ii) having a minimum anticipated
            offering price of $5,000,000 may request the Company to register
            under the Act all or any portion of the shares of Registrable
            Securities held by such requesting Holder or Holders for sale on
            Form S-1 in the manner specified in such notice. Notwithstanding
            anything to the contrary contained herein, the Company shall not be
            obligated to effect, or to take any action to effect, any such
            registration pursuant to this Section 1.2:

                    (i) during the period starting with the date sixty (60) days
                prior to the Company's good faith estimate of the date of filing
                of, and ending on a date one hundred eighty (180) days after the
                effective date of, a Company-initiated registration (but in any
                event no greater than three hundred sixty (360) days after a
                request is made under this Section 1.2); provided that the
                Company is actively employing in good faith all reasonable
                efforts to cause such registration statement to become
                effective;

                    (ii) if the requesting Holders do not request that such
                offering be firmly underwritten by underwriters reasonably
                acceptable to the Company;

                    (iii) if the Company and the requesting Holders are unable
                to obtain the commitment of the underwriter described in clause
                (ii) above to firmly underwrite the offering; or

                    (iv) if in the good faith judgment of the Board of Directors
                of the Company, such registration would be seriously detrimental
                to the Company and the Board of Directors of the Company
                concludes, as a result, that it is essential to defer the filing
                of such registration statement at such time, in which case the
                Company shall furnish to such Holders a certificate signed by
                the President of the Company stating that in the good faith
                judgment of the Board of Directors of the Company, it would be
                seriously detrimental to the Company for such registration
                statement to be filed in the near future and that it is,
                therefore, essential to defer the filing of such registration
                statement, then the Company shall have the right to defer such
                filing for a period of not more than 180 days after receipt of
                the request of the requesting holders, and, provided further,
                that the Company shall not defer its obligation in this manner
                more than once in any eighteen-month period.

                (b) Following receipt of any notice under this Section 1.2, the
            Company shall immediately notify all holders of Registrable
            Securities from whom notice has not been received and shall use its
            best efforts to register under the Act, for public sale in
            accordance with the method of disposition specified in such notice
            from requesting holders, the number of shares of Registrable
            Securities specified in such notice (and in all notices received by
            the Company from other holders within 15 days after the giving of

                                       2
<PAGE>   3

            such notice by the Company). If such method of disposition shall be
            an underwritten public offering, the holders of a majority of the
            shares of Registrable Securities to be sold in such offering may
            designate the managing underwriter of such offering, subject to the
            approval of the Company which approval shall not be unreasonably
            withheld or delayed. The Company shall be obligated to register
            Registrable Securities pursuant to this Section 1.2 on two occasions
            only; provided, however, that such obligation shall be deemed
            satisfied only when a registration statement covering all shares of
            Registrable Securities specified in notices received and not
            rescinded as aforesaid, for sale in accordance with the method of
            disposition specified by the requesting Holders, shall have become
            effective and, if such method of disposition is a firm commitment
            underwritten public offering, all such shares shall have been sold
            pursuant thereto.

                (c) The Company and any other holders of Common Stock which the
            Company shall permit to participate shall be entitled to include in
            any registration statement referred to in this Section 1.2, for sale
            in accordance with the method of disposition specified by the
            requesting Holders, provided the Company and any such holder accept
            the terms of any underwriting agreed by the initiating Holders,
            shares of Common Stock to be sold by the Company or such other
            holders for their own account, except as and to the extent that, in
            the sole discretion of the managing underwriter (if such method of
            disposition shall be an underwritten public offering), such
            inclusion would adversely affect the success of the offering of the
            Registrable Securities to be sold. Except for registration
            statements on Form S-4, S-8 or any successor thereto, the Company
            will not file with the SEC any other registration statement with
            respect to its Common Stock, whether for its own account or that of
            other stockholders, from the date of receipt of a notice from
            requesting holders pursuant to this Section 1.2, until the
            completion of the period of distribution of the registration
            contemplated thereby.

            1.3 Company Registration. If (but without any obligation to do so)
         the Company proposes to register (including for this purpose a
         registration effected by the Company for shareholders other than the
         Holders) any of its stock or other equity securities under the Act in
         connection with the public offering of such securities solely for cash
         (other than a registration relating solely to the sale of securities to
         participants in a Company stock plan, a registration on Form S-4 or any
         other form which does not include substantially the same information as
         would be required to be included in a registration statement covering
         the sale of the Registrable Securities or a registration in which the
         only Common Stock being registered is Common Stock issuable upon
         conversion of debt securities which are also being registered), the
         Company shall, at such time, promptly give each Holder written notice
         of such registration. Upon the written request of each Holder given
         within twenty (20) days after mailing of such notice by the Company in
         accordance with Section 3.5, the Company shall, subject to the
         provisions of Section 1.7, cause to be registered under the Act all of
         the Registrable Securities that each such Holder has requested to be
         registered.

            1.4 Obligations of the Company. Whenever required under this Section
         1 to effect the registration of any Registrable Securities, the Company
         shall, as expeditiously as reasonably possible:

                (a) Prepare and file with the SEC a registration statement with
            respect to such Registrable Securities and use all reasonable
            efforts to cause such registration statement to become effective,
            and upon the request of the Holders of a majority of the

                                       3
<PAGE>   4
            Registrable Securities, keep such registration statement effective
            for a period of up to sixty (60) days or, if earlier, until the
            Holder of Holders have completed the distribution related thereto.

                (b) Prepare and file with the SEC such amendments and
            supplements to such registration statement and the prospectus used
            in connection with such registration statement as may be necessary
            to comply with the provisions of the Act and as may be necessary to
            keep such registration statement effective for a period of up to 60
            days.

                (c) Furnish to the Holders such numbers of copies of a
            prospectus, including a preliminary prospectus, in conformity with
            the requirements of the Act, and such other documents as they may
            reasonably request in order to facilitate the disposition of
            Registrable Securities owned by them.

                (d) Use its best efforts to register and qualify the securities
            covered by such registration statement under such other securities
            or Blue Sky laws of such jurisdictions as shall be reasonably
            requested by the Holders.

                (e) In the event of any underwritten public offering, enter into
            and perform its obligations under an underwriting agreement, in
            usual and customary form, with the managing underwriter of such
            offering. Each Holder participating in such underwriting shall also
            enter into and perform its obligations under such an agreement.

                (f) Notify each Holder of Registrable Securities covered by such
            registration statement at any time when a prospectus relating
            thereto is required to be delivered under the Act of the happening
            of any event as a result of which the prospectus included in such
            registration statement, as then in effect, includes an untrue
            statement of a material fact or omits to state a material fact
            required to be stated therein or necessary to make the statements
            therein not misleading in the light of the circumstances then
            existing.

                (g) Cause all such Registrable Securities registered pursuant
            hereunder to be listed on each securities exchange on which similar
            securities issued by the Company are then listed.

                (h) Provide a transfer agent and registrar for all Registrable
            Securities registered pursuant hereunder and a CUSIP number for all
            such Registrable Securities in each case not later than the
            effective date of such registration.

                (i) Furnish, at the request of a majority of the Holders
            participating in the registration, on the date that such Registrable
            Securities are delivered to the underwriters for sale, if such
            securities are being sold through underwriters, or, if such
            securities are not being sold through underwriters, on the date that
            the registration statement with respect to such securities becomes
            effective, (i) an opinion, dated as of such date, of the counsel
            representing the Company for the purposes of such registration, in
            form and substance as is customarily given to underwriters in an
            underwritten public offering and reasonably satisfactory to a
            majority in interest of the Holders requesting registration,
            addressed to the underwriters, if any, and to the Holders requesting
            registration of Registrable Securities and (ii) a letter dated as of
            such date, from the independent certified public accountants of the
            Company, in form and substance as is customarily

                                       4
<PAGE>   5

            given by independent certified public accountants to underwriters in
            an underwritten public offering and reasonably satisfactory to a
            majority in interest of the Holders requesting registration,
            addressed to the underwriters, if any, and if permitted by
            applicable accounting standards, to the Holders requesting
            registration of Registrable Securities.

            1.5 Furnish Information. It shall be a condition precedent to the
         obligations of the Company to take any action pursuant to this Section
         1 with respect to the Registrable Securities of any selling Holder that
         such Holder shall furnish to the Company such information regarding
         itself, the Registrable Securities held by it, and the intended method
         of disposition of such securities as shall be required to effect the
         registration of such Holder's Registrable Securities.

            1.6 Expenses of Company Registration. The Company shall bear and pay
         all expenses incurred in connection with any registration, filing or
         qualification of Registrable Securities with respect to the
         registrations pursuant to Sections 1.2, 1.3 or 1.11 for each Holder
         (which right may be assigned as provided in Section 1.12), including
         (without limitation) all registration, filing, and qualification fees,
         printers and accounting fees relating or apportionable thereto and the
         fees and disbursements of counsel for the Company and the reasonable
         fees and disbursements of one counsel for the selling Holders selected
         by them, but excluding underwriting discounts and selling commissions
         relating to Registrable Securities.

            1.7 Underwriting Requirements. In connection with any offering
         involving an underwriting of shares of the Company's capital stock, the
         Company shall not be required under Section 1.3 to include any of the
         Holders' securities in such underwriting unless they accept the terms
         of the underwriting as agreed upon between the Company and the
         underwriters selected by it (or by other persons entitled to select the
         underwriters), and then only in such quantity as the underwriters
         determine in their sole discretion will not jeopardize the success of
         the offering by the Company. If the total amount of securities,
         including Registrable Securities, requested by shareholders to be
         included in such offering exceeds the amount of securities sold other
         than by the Company that the underwriters determine in their sole
         discretion is compatible with the success of the offering, then the
         Company shall be required to include in the offering only that number
         of such securities, including Registrable Securities, which the
         underwriters determine in their sole discretion will not jeopardize the
         success of the offering (the securities so included to be apportioned
         pro rata among the selling shareholders according to the total amount
         of securities entitled to be included therein owned by each selling
         shareholder or in such other proportions as shall mutually be agreed to
         by such selling shareholders) but in no event shall the amount of
         securities of the selling Holders included in the offering be reduced
         below thirty percent (30%) of the total amount of securities included
         in such offering, unless such offering is the initial public offering
         of the Company's securities in which case the selling shareholders may
         be excluded if the underwriters make the determination described above
         and no other shareholder's securities are included. For purposes of the
         preceding parenthetical concerning apportionment, for any selling
         shareholder which is a holder of Registrable Securities and which is a
         partnership or corporation, the partners, retired partners and
         shareholders of such holder, or the estates and family members of any
         such partners and retired partners and any trusts for the benefit of
         any of the foregoing persons shall be deemed to be a single "selling
         shareholder", and any pro-rata reduction with respect to such "selling
         shareholder" shall be based upon the aggregate amount of shares
         carrying registration rights owned by all entities and individuals
         included in such "selling shareholder," as defined in this sentence.

                                       5
<PAGE>   6

            1.8 Delay of Registration. No Holder shall have any right to obtain
         or seek an injunction restraining or otherwise delaying any such
         registration as the result of any controversy that might arise with
         respect to the interpretation or implementation of this Section 1.

            1.9 Indemnification. In the event any Registrable Securities are
         included in a registration statement under this Section 1:

                (a) To the extent permitted by law, the Company will indemnify
            and hold harmless each Holder, any underwriter (as defined in the
            Act) for such Holder and each person, if any, who controls such
            Holder or underwriter within the meaning of the Act or the 1934 Act,
            against any losses, claims, damages, or liabilities (joint or
            several) to which they may become subject under the Act, the 1934
            Act, or other federal or state law, insofar as such losses, claims,
            damages, or liabilities (or actions in respect thereof) arise out of
            or are based upon any of the following statements, omissions or
            violations (collectively a "Violation"): (i) any untrue statement or
            alleged untrue statement of a material fact contained in such
            registration statement, including any preliminary prospectus or
            final prospectus contained therein or any amendments or supplements
            thereto, (ii) the omission or alleged omission to state therein a
            material fact required to be stated therein, or necessary to make
            the statements therein not misleading, or (iii) any violation or
            alleged violation by the Company of the Act, the 1934 Act, any state
            securities law or any rule or regulation promulgated under the Act,
            the 1934 Act or any state securities law; and the Company will pay
            to each such Holder, underwriter or controlling person, as incurred,
            any legal or other expenses reasonably incurred by them in
            connection with investigating or defending any such loss, claim,
            damage, liability, or action; provided, however, that the indemnity
            agreement contained in this subsection 1.9(a) shall not apply to
            amounts paid in settlement of any such loss, claim, damage,
            liability, or action if such settlement is effected without the
            consent of the Company (which consent shall not be unreasonably
            withheld), nor shall the Company be liable in any such case for any
            such loss, claim, damage, liability, or action to the extent that it
            arises out of or is based upon a Violation which occurs in reliance
            upon and in conformity with written information furnished expressly
            for use in connection with such registration by any such Holder,
            underwriter or controlling person.

                (b) To the extent permitted by law, each selling Holder will
            indemnify and hold harmless the Company, each of its directors, each
            of its officers who has signed the registration statement, each
            person, if any, who controls the Company within the meaning of the
            Act, any underwriter, any other Holder selling securities in such
            registration statement and any controlling person of any such
            underwriter or other Holder, against any losses, claims, damages, or
            liabilities (joint or several) to which any of the foregoing persons
            may become subject, under the Act, or the 1934 Act, or other federal
            or state law, insofar as such losses, claims, damages, or
            liabilities (or actions in respect thereto) arise out of or are
            based upon any Violation, in each case to the extent (and only to
            the extent) that such Violation occurs in reliance upon and in
            conformity with written information furnished by such Holder under
            an instrument duly executed by such Holder and stated to be
            specifically for use in connection with such registration; and each
            such Holder will pay, as incurred, any legal or other expenses
            reasonably incurred by any person intended to be indemnified
            pursuant to this subsection 1.9(b), in connection with investigating
            or defending any such loss, claim, damage, liability, or action;
            provided, however, that the indemnity agreement contained in this
            subsection 1.9(b) shall not apply to amounts paid in settlement of
            any such loss, claim, damage,

                                       6
<PAGE>   7

            liability or action if such settlement is effected without the
            consent of the Holder, which consent shall not be unreasonably
            withheld; provided, that, in no event shall any indemnity under this
            subsection 1.9(b) exceed the proceeds from the offering received by
            such Holder.

                (c) Promptly after receipt by an indemnified party under this
            Section 1.9 of notice of the commencement of any action (including
            any governmental action), such indemnified party will, if a claim in
            respect thereof is to be made against any indemnifying party under
            this Section 1.9, deliver to the indemnifying party a written notice
            of the commencement thereof and the indemnifying party shall have
            the right to participate in, and, to the extent the indemnifying
            party so desires, jointly with any other indemnifying party
            similarly noticed, to assume the defense thereof with counsel
            mutually satisfactory to the parties; provided, however, that an
            indemnified party (together with all other indemnified parties which
            may be represented without conflict by one counsel) shall have the
            right to retain one separate counsel, with the fees and expenses to
            be paid by the indemnifying party, if representation of such
            indemnified party by the counsel retained by the indemnifying party
            would be inappropriate due to actual or potential differing
            interests between such indemnified party and any other party
            represented by such counsel in such proceeding. The failure to
            deliver written notice to the indemnifying party within a reasonable
            time of the commencement of any such action, if materially
            prejudicial to its ability to defend such action, shall relieve such
            indemnifying party of any liability to the indemnified party under
            this Section 1.9, but the omission so to deliver written notice to
            the indemnifying party will not relieve it of any liability that it
            may have to any indemnified party otherwise than under this Section
            1.9.

                (d) If the indemnification provided for in this Section 1.9 is
            held by a court of competent jurisdiction to be unavailable to an
            indemnified party with respect to any loss, liability, claim,
            damage, or expense referred to therein, then the indemnifying party,
            in lieu of indemnifying such indemnified party hereunder, shall
            contribute to the amount paid or payable by such indemnified party
            as a result of such loss, liability, claim, damage, or expense in
            such proportion as is appropriate to reflect the relative fault of
            the indemnifying party on the one hand and of the indemnified party
            on the other in connection with the statements or omissions that
            resulted in such loss, liability, claim, damage, or expense as well
            as any other relevant equitable considerations. The relative fault
            of the indemnifying party and of the indemnified party shall be
            determined by reference to, among other things, whether the untrue
            or alleged untrue statement of a material fact or the omission to
            state a material fact relates to information supplied by the
            indemnifying party or by the indemnified party and the parties'
            relative intent, knowledge, access to information, and opportunity
            to correct or prevent such statement or omission provided that in no
            event shall any contribution by a Holder hereunder exceed the
            proceeds from the offering received by such Holder.

                (e) The obligations of the Company and Holders under this
            Section 1.9 shall survive the completion of any offering of
            Registrable Securities in a registration statement under this
            Section 1, and otherwise. No indemnifying party, in the defense of
            any such claim or litigation, shall, except with the consent of each
            indemnified party, consent to entry of any judgment or enter into
            any settlement which does not include as an unconditional term
            thereof the giving by the claimant or plaintiff to such indemnified
            party of a release from all liability in respect to such claim or
            litigation.

                                       7
<PAGE>   8

            1.10 Reports Under Securities Exchange Act of 1934. With a view to
         making available to the Holders the benefits of Rule 144 promulgated
         under the Act and any other rule or regulation of the SEC that may at
         any time permit a Holder to sell securities of the Company to the
         public without registration, the Company agrees to:

                (a) make and keep public information available, as those terms
            are understood and defined in SEC Rule 144, at all times after
            ninety (90) days after the effective date of the first registration
            statement filed by the Company for the offering of its securities to
            the general public;

                (b) take such action, including the voluntary registration of
            its Common Stock under Section 12 of the 1934 Act, as is necessary
            to enable the Holders to utilize Form S-3 for the sale of their
            Registrable Securities, such action to be taken as soon as
            practicable after the end of the fiscal year in which the first
            registration statement filed by the Company for the offering of its
            securities to the general public is declared effective;

                (c) file with the SEC in a timely manner all reports and other
            documents required of the Company under the Act and the 1934 Act;
            and

                (d) furnish to any Holder, so long as the Holder owns any
            Registrable Securities, forthwith upon request (i) a written
            statement by the Company that it has complied with the reporting
            requirements of SEC Rule 144 (at any time after ninety (90) days
            after the effective date of the first registration statement filed
            by the Company), the Act and the 1934 Act (at any time after it has
            become subject to such reporting requirements), or that it qualifies
            as a registrant whose securities may be resold pursuant to Form S-3
            (at any time after it so qualifies), (ii) a copy of the most recent
            annual or quarterly report of the Company and such other reports and
            documents so filed by the Company, and (iii) such other information
            as may be reasonably requested in availing any Holder of any rule or
            regulation of the SEC which permits the selling of any such
            securities without registration or pursuant to such form.

            1.11 Form S-3 Registration. In case the Company shall receive from
         any Holder or Holders a written request or requests that the Company
         effect a registration on Form S-3 and any related qualification or
         compliance with respect to all or a part of the Registrable Securities
         owned by such Holder or Holders, the Company will:

                (a) promptly give written notice of the proposed registration,
            and any related qualification or compliance, to all other Holders;
            and

                (b) as soon as practicable, effect such registration and all
            such qualifications and compliances as may be so requested and as
            would permit or facilitate the sale and distribution of all or such
            portion of such Holder's or Holders' Registrable Securities as are
            specified in such request, together with all or such portion of the
            Registrable Securities of any other Holder or Holders joining in
            such request as are specified in a written request given within 15
            days after receipt of such written notice from the Company;
            provided, however, that the Company shall not be obligated to effect
            any such registration, qualification or compliance, pursuant to this
            section 1.11: (1) if Form S-3 is not available for such offering by
            the Holders; (2) if the Holders, together with the holders of any
            other securities of the Company entitled to inclusion in such
            registration,

                                       8
<PAGE>   9

            propose to sell Registrable Securities and such other securities (if
            any) at an aggregate price to the public (net of any underwriters'
            discounts or commissions) of less than $1,000,000; (3) if the
            Company shall furnish to the Holders a certificate signed by the
            President of the Company stating that in the good faith judgment of
            the Board of Directors of the Company, it would be seriously
            detrimental to the Company and its shareholders for such Form S-3
            Registration to be effected at such time, in which event the Company
            shall have the right to defer the filing of the Form S-3
            registration statement for a period of not more than 60 days after
            receipt of the request of the Holder or Holders under this Section
            1.11; provided, however, that the Company shall not utilize this
            right more than once in any twelve month period; (4) if the Company
            has within the twelve (12) month period preceding the date of such
            request, already effected two registrations on Form S-3 for the
            Holders pursuant to this Section 1.11; or (5) in any particular
            jurisdiction in which the Company would be required to qualify to do
            business or to execute a general consent to service of process in
            effecting such registration, qualification or compliance.

                (c) Subject to the foregoing, the Company shall file a
            registration statement covering the Registrable Securities and other
            securities so requested to be registered as soon as practicable
            after receipt of the request or requests of the Holders. All
            expenses incurred in connection with a registration requested
            pursuant to Section 1.11, including (without limitation) all
            registration, filing, qualification, printer's and accounting fees
            and the reasonable fees and disbursements of counsel for the selling
            Holder or Holders and counsel for the Company, but excluding any
            underwriters' discounts or commissions associated with Registrable
            Securities, shall be borne pro rata by the Holder or Holders
            participating in the Form S-3 Registration. Registrations effected
            pursuant to this Section 1.11 shall not be counted as registrations
            effected pursuant to Section 1.3.

            1.12 Assignment of Registration Rights. The rights to cause the
         Company to register Registrable Securities pursuant to this Section 1
         may be assigned (but only with all related obligations) by a Holder to
         a transferee or assignee of such securities, provided: (a) the Company
         is, within a reasonable time after such transfer, furnished with
         written notice of the name and address of such transferee or assignee
         and the securities with respect to which such registration rights are
         being assigned; (b) such transferee or assignee agrees in writing to be
         bound by and subject to the terms and conditions of this Agreement,
         including without limitation the provisions of Section 1.13 below; and
         (c) such assignment shall be effective only if immediately following
         such transfer the further disposition of such securities by the
         transferee or assignee is restricted under the Act.

            1.13 "Market Stand-Off" Agreement. Each Investor hereby agrees that,
         during the period of duration specified by the Company and an
         underwriter of common stock or other securities of the Company,
         following the date of the first sale to the public pursuant to a
         registration statement of the Company filed under the Act, it shall
         not, to the extent requested by the Company and such underwriter,
         directly or indirectly sell, offer to sell, contract to sell
         (including, without limitation, any short sale), grant any option to
         purchase or otherwise transfer or dispose of (other than to donees who
         agree to be similarly bound) any securities of the Company held by it
         at any time during such period except common stock included in such
         registration; provided, however, that:

                                       9
<PAGE>   10

                (a) such agreement shall be applicable only to the first such
            registration statement of the Company which covers common stock (or
            other securities) to be sold on its behalf to the public in an
            underwritten offering;

                (b) all officers and directors of the Company and all other
            persons with registration rights (whether or not pursuant to this
            Agreement) enter into similar agreements; and

                (c) such market stand-off time period shall not exceed (180)
            days.

            In order to enforce the foregoing covenant, the Company may impose
         stop-transfer instructions with respect to the Registrable Securities
         of each Investor (and the shares or securities of every other person
         subject to the foregoing restriction) until the end of such period.

            Notwithstanding the foregoing, the obligations described in this
         Section 1.13 shall not apply to a registration relating solely to
         employee benefit plans on Form S-8 or similar forms which may be
         promulgated in the future, or a registration relating solely to an SEC
         Rule 145 transaction on Form S-4 or similar form which may be
         promulgated in the future.

            1.14 Limitation on Subsequent Registration Rights. After the date of
         this Agreement, the Company shall not, without the prior written
         consent of the Holders of a majority of the Registrable Securities,
         enter into any agreement with any holder or prospective holder of any
         securities of the Company that would grant such holder registration
         rights senior to those granted to the Holders hereunder.

            1.15 Termination of Registration Rights.

                (a) No Holder shall be entitled to exercise any right provided
            for in this Section 1 after five (5) years following the
            consummation of the sale of securities pursuant to a registration
            statement filed by the Company under the Act in connection with the
            initial firm commitment underwritten offering of its securities to
            the general public (the "Special Termination Date") provided the
            Special Termination Date shall be extended as to any Holder or
            Holders who have, prior to the Special Termination Date, filed a
            request pursuant to Section 1.2(a) or Section 1.11(b) and such
            request is being deferred by the Company pursuant to the provisions
            of Section 1.2(a)(i), Section 1.2(a)(iv) or Section 1.11(b)(3).

                (b) In addition, the right of any Holder to request registration
            or inclusion in any registration pursuant to this Section 1 shall
            terminate on such date after the closing of the first
            Company-initiated registered public offering of Common Stock of the
            Company as all shares of Registrable Securities held or entitled to
            be held upon conversion by such Holder may immediately be sold under
            Rule 144 during any 90-day period.

                                       10
<PAGE>   11

         2. COVENANTS OF THE COMPANY.

            2.1 Delivery of Financial Statements. The Company shall deliver to
         each Investor:

                (a) as soon as practicable, but in any event within one hundred
            and twenty (120) days after the end of each fiscal year of the
            Company, commencing with the fiscal year ended December 31, 1998
            (provided fiscal 1998 financial statements may be delivered
            subsequent to April 30, 1999 but shall be delivered no later than
            June 30, 1999), an income statement for such fiscal year, a balance
            sheet of the Company and statement of shareholder's equity as of the
            end of such year, and a schedule as to the sources and applications
            of funds for such year, such year-end financial reports to be in
            reasonable detail, prepared in accordance with generally accepted
            accounting principles consistently applied ("GAAP"), and audited and
            certified by independent public accountants of nationally recognized
            standing selected by the Company's Board of Directors;

                (b) as soon as practicable, but in any event within forty-five
            (45) days after the end of each of the first three (3) quarters of
            each fiscal year of the Company, an unaudited profit or loss
            statement, schedule as to the sources and application of funds for
            such fiscal quarter and a statement showing the number of shares of
            each class and series of capital stock and securities convertible
            into or exercisable for shares of capital stock outstanding at the
            end of the period, the number of common shares issuable upon
            conversion or exercise of any outstanding securities convertible or
            exercisable for common shares and the exchange ratio or exercise
            price applicable thereto, all in sufficient detail as to permit the
            Investor to calculate its percentage equity ownership in the
            Company;

                (c) as soon as practicable, but in any event thirty (30) days
            prior to the end of each fiscal year, a budget and business plan for
            the next fiscal year, prepared on a monthly basis, including balance
            sheets and sources and applications of funds statements for such
            months and, as soon as prepared, any other budgets or revised
            budgets prepared by the Company;

                (d) with respect to the financial statements called for in
            subsections (b) of this Section 2.1, an instrument executed by the
            Chief Financial Officer or President of the Company and certifying
            that such financials were prepared in accordance with GAAP
            consistently applied with prior practice for earlier periods (with
            the exception of footnotes that may be required by GAAP) and fairly
            present the financial condition of the Company and its results of
            operation for the period specified, subject to year-end audit
            adjustment; and

                (e) such other information relating to the financial condition,
            business, prospects or corporate affairs of the Company as the
            Investor or any assignee of the Investor may from time to time
            request, provided, however, that the Company shall not be obligated
            under this subsection (e) or any other subsection of Section 2.1 to
            provide information which it deems in good faith to be a trade
            secret or similar confidential information.

                                       11
<PAGE>   12

            2.2 Inspection. The Company shall permit each Investor, at such
         Investor's expense, to visit and inspect the Company's properties, to
         examine its books of account and records and to discuss the Company's
         affairs, finances and accounts with its officers, all at such
         reasonable times as may be requested by' the Investor; provided,
         however, that the Company shall not be obligated pursuant to this
         Section 2.2 to provide access to any information which it reasonably
         considers to be a trade secret or similar confidential information.

            2.3 Proprietary Information Agreement. The Company shall require all
         new employees of the Company to continue to execute and deliver a
         proprietary information agreement substantially in the form referred to
         in Section 2.19 of the Series B Convertible Preferred Stock Purchase
         Agreement

            2.4 Frist Note. The Company shall not fail to make any monthly
         payments of interest due Robert A. Frist, Jr. ("Frist") as lender under
         that certain Promissory Note dated April 21st, 1999, in the principal
         amount of $1,543,000.00.

            2.5 Termination of Covenants. The covenants set forth in Sections
         2.1, 2.2 and Section 2.7 shall terminate and be of no further force or
         effect when the sale of securities pursuant to a registration statement
         filed by the Company under the Act in connection with the firm
         commitment underwritten offering of its securities to the general
         public is consummated in which the gross proceeds are at least $30
         million and the per share price is at least $9.00.

            2.6 IRC Section 305. So long as any shares of Series B Convertible
         Preferred Stock remain outstanding, the Company will not, without
         approval of holders of a majority of the Series B Convertible Preferred
         Stock then outstanding, do any act or thing which would result in
         taxation of the holders of shares of the Series B Convertible Preferred
         Stock under Section 305 of the Internal Revenue Code of 1986, as
         amended (or any comparable provision of the Internal Revenue Code as
         hereafter from time to time amended).

            2.7 C Corporation Status. The Company shall remain a C corporation.

         3. MISCELLANEOUS.

            3.1 Successors and Assigns. Except as otherwise provided herein, the
         terms and conditions of this Agreement shall inure to the benefit of
         and be binding upon the respective successors and assigns of the
         parties (including transferees of any shares of Registrable
         Securities). Nothing in this Agreement, express or implied, is intended
         to confer upon any party other than the parties hereto or their
         respective successors and assigns any rights, remedies, obligations, or
         liabilities under or by reason of this Agreement, except as expressly
         provided in this Agreement.

            3.2 Governing Law. This Agreement shall be governed by and construed
         under the laws of the State of Tennessee applicable to contracts made
         and to be performed wholly within such state.

            3.3 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 instrument.

                                       12
<PAGE>   13

            3.4 Titles and Subtitles. The titles and subtitles used in this
         Agreement are used for convenience only and are not to be considered in
         construing or interpreting this Agreement.

            3.5 Notices. Unless otherwise provided, any notice required or
         permitted under this Agreement shall be given in writing and shall be
         deemed effectively given upon personal delivery to the party to be
         notified or upon deposit with the United States Post Office, by
         registered or certified mail, postage prepaid and addressed to the
         party to be notified at the address indicated for such party on the
         signature page hereof, or at such other address as such party may
         designate by ten (10) days' advance written notice to the other
         parties.

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

            3.7 Amendments and Waivers. Any term of this Agreement may be
         amended and the observance of any term of this Agreement may be waived
         (either generally or in a particular instance and either retroactively
         or prospectively), only with the written consent of the Company and the
         holders of at least 66 2/3% of the Registrable Securities then
         outstanding. Any amendment or waiver effected in accordance with this
         paragraph shall be binding upon each holder of any Registrable
         Securities then outstanding, each future holder of all such Registrable
         Securities, and the Company.

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

            3.9 Aggregation of Stock. All shares of Registrable Securities held
         or acquired by affiliated entities or persons shall be aggregated
         together for the purpose of determining the availability of any rights
         under this Agreement.

            3.10 Entire Agreement. This Agreement (including the Exhibits
         hereto, if any) constitutes the full and entire understanding and
         agreement between the parties with regard to the subjects hereof and
         thereof.

                                       13
<PAGE>   14

         IN WITNESS WHEREOF the parties have executed this Agreement as of the
date first above written.

                                           HEALTHSTREAM, INC.

                                           By: /s/ Robert A. Frist, Jr.
                                               ---------------------------------
                                               President

                                           209 10th Ave. South
                                           Suite 450
                                           Nashville, TN  37203

                                           INVESTORS:

                                           MARTIN INVESTMENT PARTNERSHIP III

                                           By:      THE MARTIN COMPANIES, INC.
                                                    Managing Partner

                                           By: /s/ Charles N. Martin
                                               ---------------------------------
                                               Charles N. Martin, President
                                               20 Burton Hills Blvd.
                                               Suite 100
                                               Nashville, TN  37215

                                           COLEMAN SWENSON HOFFMAN BOOTH IV L.P.

                                           By Its General Partner
                                           CSHB Ventures IV L.P.

                                           By Its General Partner

                                           /s/ Jay Hoffman
                                           -----------------------------------
                                               Jay Hoffman
                                               237 Second Ave. South
                                               Franklin, TN  37064-2469

                                           DAUPHIN CAPITAL PARTNERS I, L.P.

                                           By: /s/ James Hoover
                                               ---------------------------------
                                               James Hoover, Principal
                                               108 Forest Ave.
                                               Locust Valley, NY  11560

                                       14
<PAGE>   15

                                       JCB HEALTHSTREAM INVESTORS, L.L.C

                                       By: /s/ James Graves
                                           -------------------------------------
                                               James Graves, Chief Manager
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       NELSON CAPITAL PARTNERS III, L.P.

                                       By: /s/ John K. Harrington
                                           -------------------------------------
                                               John K. Harrington
                                               3401 West End Ave.
                                               Suite 300
                                               Nashville, TN  37203

                                       J.C. BRADFORD & CO., L.L.C

                                       By: /s/ James Graves
                                           -------------------------------------
                                               James Graves, Managing Director
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       FCA VENTURE PARTNERS II, L.P.

                                       By: /s/ Stuart C. McWhorter
                                           -------------------------------------
                                               Stuart C. McWhorter
                                               310 25th Ave. South
                                               Suite 109
                                               Nashville, TN  37203

                                       THE JOEL COMPANY

                                       By: /s/ Robert A. Gordon
                                           -------------------------------------
                                                Robert A. Gordon
                                                6444 Worchester Dr.
                                                Nashville, TN  37221

                                       CUMBERLAND EQUITY PARTNERS

                                       By: /s/ Fleming Wilt
                                           -------------------------------------
                                               Fleming Wilt
                                               201 Fourth Ave. North
                                               Suite 1390
                                               Nashville, TN  37219

                                       15
<PAGE>   16

                                       SAVVY INVESTMENT PARTNERS

                                       By: /s/ Thompson B. Patterson, Jr.
                                           -------------------------------------
                                               Thompson B. Patterson, Jr.
                                               330  Commerce Street
                                               Nashville, TN  37201

                                       CHANCERY LANE INVESTMENTS, L.P.

                                       By: /s/ H. Lee Barfield
                                           -------------------------------------
                                               H. Lee Barfield, General Partner
                                               2700 First American Ctr.
                                               Nashville, TN  37238-2700

                                       By: /s/ Mary F. Barfield
                                           -------------------------------------
                                               Mary F. Barfield, General Partner
                                               c/o H. Lee Barfield
                                               2700 First American Ctr.
                                               Nashville, TN  37238-2700

                                       THE SEVEN PARTNERSHIP

                                       By: /s/ Thompson Dent
                                           -------------------------------------
                                               Thompson Dent
                                               30 Burton Hills Boulevard
                                               Suite 500
                                               Nashville, TN 37215

                                       JCB VENTURE PARTNERSHIP IV

                                       By: /s/ Robert Doolittle
                                           -------------------------------------
                                               Robert Doolittle, Chief Manager
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       MELKUS PARTNERS, LTD.

                                       By: /s/ Ken Melkus
                                           -------------------------------------
                                               Ken Melkus
                                               102 Woodmont Blvd.
                                               Suite 110
                                               Nashville, TN  37205

                                       16
<PAGE>   17
                                       /s/ Robert A Frist, Jr.
                                       -----------------------------------------
                                       Robert A Frist, Jr.
                                       201 Abbott Glen Court
                                       Nashville, TN  37215

                                       /s/ William R. Frist
                                       -----------------------------------------
                                       William R. Frist
                                       3827 Richland Ave.
                                       Nashville, TN  37205

                                       /s/ Darren Liff
                                       -----------------------------------------
                                       Darren Liff
                                       209 10th Ave. South
                                       Suite 432
                                       Nashville, TN  37203

                                       /s/ Scott Portis
                                       -----------------------------------------
                                       Scott and Carol Len Portis
                                       6205 Hillsboro Pike
                                       Nashville, TN  37215

                                       /s/ James Frist
                                       -----------------------------------------
                                       James Frist
                                       420 Elmington Ave.
                                       Apt. 217
                                       Nashville, TN  37205

                                       /s/ Robert S. Doolittle
                                       -----------------------------------------
                                       Robert S. Doolittle
                                       J.C. Bradford & Co.
                                       330 Commerce Street
                                       Nashville, TN  37201

                                       /s/ David Beard
                                       -----------------------------------------
                                       David Beard
                                       888 Collierville-Arlington Rd. North
                                       Collierville, TN 38017

                                       /s/ John Dayani
                                       -----------------------------------------
                                       John Dayani
                                       5301 Virginia Way
                                       Suite 250
                                       Brentwood, TN   37027

                                       /s/ S. Douglas Smith
                                       -----------------------------------------
                                       S. Douglas Smith
                                       278 Franklin Road
                                       Suite 238
                                       Brentwood, TN  37027

                                       17
<PAGE>   18

                                       /s/ Dr. Scott Portis
                                       -----------------------------------------
                                       Dr. Scott Portis
                                       214 East Main Street
                                       Huntingdon, TN  38344

                                       /s/ Barbara Sampson
                                       -----------------------------------------
                                       Barbara Sampson
                                       407 Lyons Head Drive
                                       Knoxville, TN  37919

                               MORGAN STANLEY VENTURE PARTNERS III, L.P.

                               by: Morgan Stanley Venture Partners III, L.L.C
                                   its General Partner

                               by: Morgan Stanley Venture Capital III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Debra Abramovitz
                                   ---------------------------------------------

                               MORGAN STANLEY VENTURE INVESTORS III, L.P.

                               by: Morgan Stanley Venture Partners III, L.L.C
                                   its General Partner

                               by: Morgan Stanley Venture Capital III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Debra Abramovitz
                                   ---------------------------------------------

                               THE MORGAN STANLEY VENTURE PARTNERS
                                 ENTREPRENUER FUND, L.P.

                               by: Morgan Stanley Venture Partners, L.L.C
                                     its General Partner

                               by: Morgan Stanley Venture Capital Fund III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Debra Abramovitz
                                   ---------------------------------------------

                                       18
<PAGE>   19

                               GE CAPITAL EQUITY INVESTMENTS, INC.

                               By: /s/ Jeffrey T. Soukup
                                   ---------------------------------------------
                                   Jeffrey T. Soukup, Vice President
                                   120 Long Ridge Rd.
                                   Samford, CT  06927

                               CARSON/PAUL ASSOCIATES LLC

                               By: /s/ Russell L. Carson
                                   ---------------------------------------------
                                   Russell L. Carson, Managing Member
                                   Welsh, Carson, Anderson & Stowe
                                   320 Park Ave.
                                   25th Floor
                                   New York, NY 10022

                                       19
<PAGE>   20

                               HEALTHSTREAM, INC.

                                  AMENDMENT TO
                            INVESTOR RIGHTS AGREEMENT

         This Amendment to Investor Rights Agreement executed as of the 11th day
of August, 1999 amends the Investor Rights Agreement (the "Agreement") executed
as of the 21st day of April, 1999, by and between HealthStream, Inc., a
Tennessee corporation (the "Company"), and the investors listed on Schedule A of
the Agreement, and is entered into among the Company, GE Medical Systems, a
division of the General Electric Company, a New York corporation ("GEMS"), and
those persons who purchase shares of the Company's Series C Convertible
Preferred Stock pursuant to the Series C Convertible Preferred Stock Purchase
Agreement (the "Series C Purchasers") (GEMS, the Series C Purchasers and the
investors listed on Schedule A of the Agreement are hereinafter referred to as
an "Investor" and collectively as the "Investors").

         WHEREAS, the Series C Purchasers are acquiring an aggregate of up to
650,000 shares of the Series C Convertible Preferred Stock of the Company;

         WHEREAS, the signatories hereto which are also signatories to the
Agreement are the holders of at least 66 2/3% of the Registrable Securities
presently outstanding;

         WHEREAS, the Company and GEMS are parties to a Rights Agreement
executed as of the 14th day of June, 1999 ("Rights Agreement") in connection
with the Company's grant to GEMS of certain rights to acquire shares of the
Common Stock of the Company (the "Warrants") pursuant to a Warrant Agreement of
even date with the Rights Agreement (the "Warrant Agreement");

         WHEREAS, it is a condition of the investment of the Series C Purchasers
that the Company, GEMS and the Series C Purchasers enter into this Amendment
amending certain of the terms and conditions of the Agreement and terminating
the Rights Agreement;

         NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

1. Subsection (e) of Section 1.1 entitled "Registrable Securities" shall be
amended to read as follows:

         "(e) The term "Registrable Securities" means (i) the Common Stock
issuable or issued upon conversion of the Series A, Series B and Series C
Convertible Preferred Stock, (ii) any Common Stock of the Company issued or to
be issued upon conversion or exercise of the Warrants (or upon conversion of any
securities issued upon conversion or exercise of the Warrants) and (iii) any
Common Stock of the Company issued as (or issuable upon the conversion or
exercise of any warrant, right or other security which is issued as) a dividend
or other distribution with respect to, or in exchange for or in replacement of
the shares referenced in (i) and (ii) above, excluding in all cases, however,
any Registrable Securities sold by a person in a transaction in which his rights
under this Section 1 are not assigned."

2. This Amendment shall be effective upon the written consent of the Company and
the holders of at least 66 2/3% of the Registrable Securities then outstanding.

<PAGE>   21

3. This Amendment, and the rights of the parties hereto, shall be governed by
and construed in accordance with the laws of the State of Tennessee, without
regard to such state's conflict of laws provisions.

4. This Amendment may be executed in one or more counterparts, each of which
will be deemed an original but all of which together shall constitute one and
the same instrument.

5. All other terms and provisions of the Agreement shall remain unchanged and
are in full force and effect.

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

                                           HEALTHSTREAM, INC.

                                           By: /s/ Robert A. Frist, Jr.
                                               ---------------------------------
                                               President

                                           209 10th Ave. South
                                           Suite 450
                                           Nashville, TN  37203

                                           INVESTORS:

                                           MARTIN INVESTMENT PARTNERSHIP III

                                           By:      THE MARTIN COMPANIES, INC.
                                                    Managing Partner

                                           By: /s/ Charles N. Martin
                                               ---------------------------------
                                               Charles N. Martin, President
                                               20 Burton Hills Blvd.
                                               Suite 100
                                               Nashville, TN  37215

                                           COLEMAN SWENSON HOFFMAN BOOTH IV L.P.

                                           By Its General Partner
                                           CSHB Ventures IV L.P.

                                           By Its General Partner

                                           /s/ Jay Hoffman
                                           -----------------------------------
                                               Jay Hoffman
                                               237 Second Ave. South
                                               Franklin, TN  37064-2469

                                       2
<PAGE>   22

                                       DAUPHIN CAPITAL PARTNERS I, L.P.

                                       By: /s/ James Hoover
                                           -------------------------------------
                                               James Hoover, Principal
                                               108 Forest Ave.
                                               Locust Valley, NY  11560

                                       JCB HEALTHSTREAM INVESTORS, L.L.C

                                       By: /s/ James Graves
                                           -------------------------------------
                                               James Graves, Chief Manager
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       NELSON CAPITAL PARTNERS III, L.P.

                                       By: /s/ John K. Harrington
                                           -------------------------------------
                                               John K. Harrington
                                               3401 West End Ave.
                                               Suite 300
                                               Nashville, TN  37203

                                       J.C. BRADFORD & CO., L.L.C

                                       By: /s/ James Graves
                                           -------------------------------------
                                               James Graves, Managing Director
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       FCA VENTURE PARTNERS II, L.P.

                                       By: /s/ Stuart C. McWhorter
                                           -------------------------------------
                                               Stuart C. McWhorter
                                               310 25th Ave. SouthSuite 109
                                               Nashville, TN  37203

                                       THE JOEL COMPANY

                                       By: /s/ Robert Gordon
                                           -------------------------------------
                                               Robert Gordon
                                               6444 Worchester Dr.
                                               Nashville, TN  37221

                                       3
<PAGE>   23

                                       CUMBERLAND EQUITY PARTNERS

                                       By: /s/ Fleming Wilt
                                           -------------------------------------
                                               Fleming Wilt
                                               201 Fourth Ave. North
                                               Suite 1390
                                               Nashville, TN  37219

                                       SAVVY INVESTMENT PARTNERS

                                       By: /s/ Thompson B. Patterson, Jr.
                                           -------------------------------------
                                               Thompson B. Patterson, Jr.
                                               330  Commerce Street
                                               Nashville, TN  37201

                                       CHANCERY LANE INVESTMENTS, L.P.

                                       By: /s/ H. Lee Barfield
                                           -------------------------------------
                                               H. Lee Barfield, General Partner
                                               2700 First American Ctr.
                                               Nashville, TN  37238-2700

                                       By: /s/ Mary F. Barfield
                                           -------------------------------------
                                               Mary F. Barfield, General Partner
                                               c/o H. Lee Barfield
                                               2700 First American Ctr.
                                               Nashville, TN  37238-2700

                                       THE SEVEN PARTNERSHIP

                                       By: /s/ John K. Crawford
                                           -------------------------------------
                                               John K. Crawford
                                               30 Burton Hills Boulevard
                                               Suite 500
                                               Nashville, TN 37215

                                       JCB VENTURE PARTNERSHIP IV

                                       By: /s/ Robert Doolittle
                                           -------------------------------------
                                               Robert Doolittle, Chief Manager
                                               330 Commerce St.
                                               Nashville, TN  37201

                                       4
<PAGE>   24

                                       MELKUS PARTNERS, LTD.

                                       By: /s/ Ken Melkus
                                           -------------------------------------
                                               Ken Melkus
                                               102 Woodmont Blvd.
                                               Suite 110
                                               Nashville, TN  37205

                                       /s/ Robert A Frist, Jr.
                                       -----------------------------------------
                                       Robert A Frist, Jr.
                                       201 Abbott Glen Court
                                       Nashville, TN  37215

                                       /s/ William R. Frist
                                       -----------------------------------------
                                       William R. Frist
                                       3827 Richland Ave.
                                       Nashville, TN  37205

                                       /s/ Darren Liff
                                       -----------------------------------------
                                       Darren Liff
                                       209 10th Ave. South
                                       Suite 432
                                       Nashville, TN  37203

                                       /s/ Scott Portis
                                       -----------------------------------------
                                       Scott and Carol Len Portis
                                       6205 Hillsboro Pike
                                       Nashville, TN  37215

                                       /s/ James Frist
                                       -----------------------------------------
                                       James Frist
                                       420 Elmington Ave.
                                       Apt. 217
                                       Nashville, TN  37205

                                       /s/ Robert S. Doolittle
                                       -----------------------------------------
                                       Robert S. Doolittle
                                       J.C. Bradford & Co.
                                       330 Commerce Street
                                       Nashville, TN  37201

                                       5
<PAGE>   25

                                       /s/ David Beard
                                       -----------------------------------------
                                       David Beard
                                       888 Collierville-Arlington Rd. North
                                       Collierville, TN 38017

                                       /s/ John Dayani
                                       -----------------------------------------
                                       John Dayani
                                       5301 Virginia Way
                                       Suite 250
                                       Brentwood, TN   37027

                                       /s/ S. Douglas Smith
                                       -----------------------------------------
                                       S. Douglas Smith
                                       278 Franklin Road
                                       Suite 238
                                       Brentwood, TN  37027

                                       /s/ Dr. Scott Portis
                                       -----------------------------------------
                                       Dr. Scott Portis
                                       214 East Main Street
                                       Huntingdon, TN  38344

                                       /s/ Barbara Sampson
                                       -----------------------------------------
                                       Barbara Sampson
                                       407 Lyons Head Drive
                                       Knoxville, TN  37919

                               MORGAN STANLEY VENTURE PARTNERS III, L.P.

                               by: Morgan Stanley Venture Partners III, L.L.C.
                                   its General Partner

                               by: Morgan Stanley Venture Capital III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Fazle Husain
                                   ---------------------------------------------

                               MORGAN STANLEY VENTURE INVESTORS III, L.P.

                               by: Morgan Stanley Venture Partners III, L.L.C.
                                   its General Partner

                               by: Morgan Stanley Venture Capital III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Fazle Husain
                                   ---------------------------------------------

                                       6
<PAGE>   26

                               THE MORGAN STANLEY VENTURE PARTNERS
                                 ENTREPRENUER FUND, L.P.

                               by: Morgan Stanley Venture Partners, L.L.C
                                   its General Partner

                               by: Morgan Stanley Venture Capital Fund III, Inc.
                                   its Institutional Managing Member

                               By: /s/ Fazle Husain
                                   ---------------------------------------------

                                       GE CAPITAL EQUITY INVESTMENTS, INC.

                                       By: /s/ Michael E. Aspinwall
                                           -------------------------------------
                                               Michael E. Aspinwall,
                                               Senior Vice President
                                               120 Long Ridge Rd.
                                               Samford, CT  06927

                                       CARSON/PAUL ASSOCIATES LLC

                                       By: /s/ Russell L. Carson
                                           -------------------------------------
                                               Russell L. Carson
                                               Welsh, Carson, Anderson & Stowe
                                               320 Park Ave.
                                               25th Floor
                                               New York, NY 10022

                                       GE MEDICAL SYSTEMS

                                       By: /s/ Steve Kellet
                                           -------------------------------------
                                               3000 North Grandview Boulevard
                                               Waukesha, WI  53188

                                       7
<PAGE>   27

                                       /s/ James & Cassandra Daniell
                                       -----------------------------------------
                                           James & Cassandra Daniell
                                           5935 Post Road
                                           Nashville, TN  37205

                                       /s/ Carol Frist
                                       -----------------------------------------
                                           Carol Frist
                                           1326 Page Road
                                           Nashville, TN  37205

                                       /s/ Robert A Frist, Sr.
                                       -----------------------------------------
                                           Robert A Frist, Sr.
                                           1326 Page Road
                                           Nashville, TN  37205

                                       /s/
                                       -----------------------------------------
                                           Earl & Judith Ginn
                                           713 Summerwind Circle
                                           Nashville, TN  37215

                                       HEALTHSTREAM PARTNERS

                                       By: /s/ Thomas F. Frist III
                                           -------------------------------------
                                               General Partner
                                               900-A, 3319 West End Avenue
                                               Nashville, Tennessee 37203

                                       VANDERBILT UNIVERSITY

                                       By: /s/ Harry R. Jacobson
                                           -------------------------------------

                                        BORNEO PARTNERS

                                       By: /s/ Michael Pote
                                           -------------------------------------
                                               Michael Pote, Administrator
                                               8181 Londonberry Road
                                               Nashville, TN 37221

                                       /s/ Virginia Duncombe
                                       -----------------------------------------
                                       Virginia Duncombe
                                       153 Bingham Ave.
                                       Rumson, NJ  07760

                                       /s/ Stephen F. Rogers
                                       -----------------------------------------
                                       Stephen and Linda Rogers
                                       601 Foxborough Sq. N.
                                       Brentwood, TN 37027

                                       /s/ Dan McLaren
                                       -----------------------------------------
                                       Dan McLaren
                                       212 Deer Park Circle
                                       Nashville, TN  37205

                                       /s/ Carrie C. McLaren
                                       -----------------------------------------
                                       Jeffrey and Carrie McLaren
                                       147 Kenner Ave.
                                       Nashville, TN  37205

                                       /s/ Robert F. Merriman
                                       -----------------------------------------
                                       Robert F. Merriman
                                       # 14 Nottingham
                                       Amarillo, TX  79124

                                       SC FUND I, L.P.

                                       By: /s/ James Collins
                                           -------------------------------------
                                                General Partner
                                                10666 North Torrey Pines Rd.
                                                La Jolla, CA  92037
                                                Scripps Clinic Management
                                                Services Organization, Inc.

                                       FRIST FAMILY INTERNET PARTNERS

                                       By: /s/ Robert A. Frist, Sr.
                                           -------------------------------------
                                                Robert A Frist, Sr.
                                                1326 Page Road
                                                Nashville, TN 37205

                                       8

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