Document:

<PAGE>
                                                                   EXHIBIT 10.57
                          ARIAD GENE THERAPEUTICS, INC.

                            STOCK TRANSFER AGREEMENT

In consideration of the covenants and agreements set forth herein and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
mutually acknowledged, the parties hereto covenant and agree as follows:

The undersigned stockholder (the "Stockholder") of ARIAD Gene Therapeutics, Inc.
(the "Company") agrees that, in the event he or she desires to sell, assign,
transfer or otherwise dispose of any of the shares of capital stock of the
Company now held or at anytime hereafter acquired by him or her (the "Shares")
to any person, he or she will notify (the "Notification") the Company in writing
addressed to its principal executive offices of his or her intention to do so,
specifying the amount of Shares proposed to be transferred (the "Offered
Shares"), the name of the person or persons (the "Third Party Purchaser") to
whom he or she proposes to transfer the Offered Shares, and a price per share
which shall be the minimum price per share at which he or she proposes to effect
the transfer (the "Minimum Price"). The Notification shall contain an
affirmation by the Stockholder that such Offered Shares are proposed to be
transferred pursuant to a bona fide written purchase contract and that the
Stockholder has a reasonable expectation of being able to effect the transfer at
the Minimum Price to the Third Party Purchaser, and shall recite the basis for
such expectation. The Notification shall offer to sell to the Company and/or its
designees the Offered Shares, free and clear of any liens or encumbrances in
favor of third persons, at the Minimum Price and on such other terms and
conditions, if any, not less favorable to the Company and its designees as those
proposed to be offered to such Third Party Purchaser. In the event all or any
part of the consideration shall consist of consideration other than cash, the
Minimum Price shall include the fair value of such other consideration as
determined in good faith by the Company's Board of Directors.

The Company and its designees shall have the right to purchase the Offered
Shares in accordance with the terms contained herein. The Company shall respond
to the offer of the Stockholder within 30 days after receipt of the
Notification. If the Company does not accept the offer of the Offered Shares in
its entirety, the Stockholder shall be free to proceed to sell all, but not less
than all, of the Offered Shares to the Third Party Purchaser specified in the
Notification at not less than the Minimum Price. At least two business days
prior to the closing of the purchase of the Offered Shares by the Third Party
Purchaser (the "Third Party Closing"), the Stockholder shall deliver to the
Company a certificate executed by the Third Party Purchaser stating that (i) the
terms and conditions set forth in the Notification have been approved by the
Third Party Purchaser's board of directors (or the equivalent governing body if
the Third Party Purchaser is not a corporation), if applicable, (ii) the Third
Party Purchaser is aware of the rights of the Company contained in this
Agreement, and (iii) upon consummation of the Third Party Closing, the Third
Party Purchaser shall become a party to this Agreement and agree to be bound by
the terms and conditions hereof.

If the Stockholder fails to complete his or her proposed sale within a period of
60 days after the earlier to occur of (i) the date of rejection by the Company
of the offer contained in the Notification or (ii) the date that is 30 days
after the date of receipt by the Company of the Notification (the "Offer
Expiration Date"), then the Offered Shares shall once again be subject to the
requirements of a prior offer to the Company pursuant to the provisions of this
Agreement.

In the event the Company and it designees shall elect to purchase or acquire all
of the Offered Shares, written notice (the "Acceptance") to the Stockholder of
such election to purchase or so acquire all of the Offered Shares shall, when
taken in conjunction with the Notification, be deemed to constitute a valid and
legally binding purchase and sale agreement.
<PAGE>
The closing of a purchase and sale of Offered Shares pursuant hereto shall take
place at the principal executive offices of the Company on the 30th day
following the Offer Expiration Date (unless another time is specified in the
Acceptance or is otherwise mutually agreed upon), at which time the Stockholder
shall deliver the stock certificate or certificates representing the Offered
Shares so sold (duly endorsed or accompanied by a duly executed stock power or
assignment to effect transfer of ownership to the purchaser or purchasers on the
records of the Company) against the Stockholder's receipt of payment of the
Minimum Price by certified check, bank cashiers check or wire transfer.

The Stockholder acknowledges that the Company shall be authorized to (i) affix a
legend referencing this Agreement on each certificate representing Shares issued
to the Stockholder, and (ii) impose stop transfer orders with the Company's
transfer agent.

The provisions of this Agreement shall not apply to the transfer of Offered
Shares by the Stockholder to (i) the heirs, executors or legal representatives
of the Stockholder, (ii) the members of the immediate family of the Stockholder,
or (iii) the trustees of an inter vivos or testamentary trust for the benefit of
members of immediate family of the Stockholder, provided that, in each such
case, such transferee shall become a party to this Agreement and agree to be
bound by the terms and conditions hereof.

IN WITNESS WHEREOF, this Agreement has been executed on behalf of each of the
Stockholder and the Company on this ____ day of March 2001.

                                       STOCKHOLDER

                                       /s/ See Exhibit A
                                       --------------------------------
                                       Name:

                                       ARIAD GENE THERAPEUTICS, INC.

                                       By:  /s/ Harvey Berger
                                       ----------------------
                                       Title:  Chairman and CEO
<PAGE>
                                    EXHIBIT A
<TABLE>
<CAPTION>
STOCKHOLDER                                                  EXECUTION DATE
-----------                                                  --------------
<S>                                                          <C>
Harvey J. Berger                                             March 12, 2001
David L. Berstein                                            March 13, 2001
Gerald Crabtree                                              January 31, 2001
John D. Iuliucci                                             March 13, 2001
Jay R. LaMarche                                              March 13, 2001
Stuart Schreiber                                             January 31, 2001
Manfred Weigele                                              March 13, 2001
</TABLE><PAGE>
                                                                   EXHIBIT 10.58

CERTIFIED MAIL - RETURN RECEIPT

October 2, 2001

Mr. Michael Farley
Vice President, Asset Management
Forest City Commercial Group
38 Sidney Street
Cambridge, MA  02139

       Re:    Notice of Extension of Lease

Dear Mike:

Please be advised that pursuant to Section 2.6 of the lease dated January 8,
1992 by and between Forest City and ARIAD Corporation for certain lease space in
the building at 26 Landsdowne Street, Cambridge, Massachusetts, as amended (the
"Lease"), ARIAD hereby extends the lease for the first lease extension period
commencing on August 1, 2002 and terminating on July 31, 2007.

Moreover, the Annual Fixed Rent (as defined in the Lease) to be paid by ARIAD
during the first extension term shall be determined pursuant to the formula
described in Section 2.6 of the Lease. To that end, attached please find a
spreadsheet containing ARIAD's proposed formula in Section 2.6 of the Lease. For
illustrative purposes, the attached calculations hypothetically assume an
extension start date of September 1, 2001, since bi-monthly inflation indices
are presently available only through July, 2001.

Once you have had an opportunity to review the attachment, please feel free to
call me with any questions or comments you may have. Also, I would be happy to
send you an electronic copy of the Excel spreadsheet that produced the
attachment, if it will assist your review. Please confirm receipt of this letter
by signing and dating below and returning to my attention by facsimile at
617-494-1828.

Sincerely yours,

/s/Harvey J. Berger

Harvey J. Berger, M.D.

HJB:bdm

Received:         /s/Michael Farley
                  -----------------
                  Name

                  Vice President

                  October 3, 2001<PAGE>
                                                              Rec. Nov. 10, 2000
                                                                    Exhibit 10.9

                              AGREEMENT OF SUBLEASE

     This Agreement of Sublease (this "Sublease") is made as of the 31st day of
March, 2000 by and between RENAISSANCE WORLDWIDE, INC., a Massachusetts
corporation, having an office at 52 Second Avenue, Waltham, Massachusetts 02451
("Sublessor"), and NETEGRITY, INC., a Delaware corporation, having an office at
200 West Street, Waltham, Massachusetts 02451 ("Sublessee").

                                   WITNESSETH

     WHEREAS, by a certain Lease Agreement, dated as of June 30, 1998 (the
"Lease"), by and between Waltham 60/10 LLC ("Landlord"), as landlord, and
Sublessor, as tenant, Landlord leased to Sublessor certain premises consisting
of approximately 201,378 rentable square feet (the "Premises), being all of the
rentable area in that certain building known as and numbered 52 Second Avenue,
Waltham, Massachusetts (the "Building"), which Premises are more particularly
described in the Lease, a copy of which Lease is annexed hereto as EXHIBIT A and
made a part hereof; and

     WHEREAS, Sublessee desires to sublease from Sublessor and Sublessor is
willing to sublease to Sublessee a portion of the Premises consisting of the
entire third floor of the Building, containing approximately 50,345 rentable
square feet as more particularly set forth on EXHIBIT B annexed hereto and made
a part hereof (the "Subleased Premises");

     NOW THEREFORE, in consideration of Ten Dollars ($10) in hand paid by
Sublessee to Sublessor, the mutual covenants herein contained and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

     1.   SUBLEASING OF SUBLEASED PREMISES; CONDITION OF PREMISES.

     (1)  Sublessor hereby subleases to Sublessee and Sublessee hereby hires
from Sublessor, the Subleased Premises, upon and subject to all of the terms,
covenants, rentals and conditions hereinafter set forth.

     (2)  Sublessee shall accept so much of the Subleased Premises, containing
approximately 30,000 rentable square feet, as is currently finished and improved
for Sublessor's occupancy, as more particularly shown on Exhibit B- 1 attached
hereto and made apart hereof (the "Initial Premises"). The Subleased Premises
shall be delivered broom clean and otherwise in "as is" condition as of the date
hereof, subject to ordinary wear and tear between the date hereof and the
"Commencement Date" (as hereinafter defined). Sublessee expressly acknowledges
and agrees that Sublessor has made no representations with respect to the

<PAGE>

Subleased Premises or the Building except as expressly provided herein and is
not obligated to make repairs of or to perform any work at the Subleased
Premises, except as set forth in subsection (c) below. To the best of
Sublessor's knowledge, as of the date hereof, electric, plumbing and other major
Building systems servicing the Subleased Premises are in good working order and
repair and the Subleased Premises are in compliance with all laws, ordinances,
codes and regulations affecting the Premises.

     (3)  The balance of the Subleased Premises (i.e. so much of the Subleased
Premises as is not part of the Initial Premises), containing approximately
20,345 rentable square feet, as more particularly shown on Exhibit B-2 attached
hereto and made a part hereof (the "Additional Premises"), is currently
unfinished "shell" space. Sublessee and Sublessor have agreed upon the
layout/partitioning plan for the Additional Premises, which layout/partitioning
plan is attached hereto as Exhibit C and made a part hereof. Sublessor shall, at
Sublessor's sole cost and expense, cause the Additional Premises to be built out
in accordance with Exhibit C to a kind and quality of construction consistent
with that of the Initial Premises as of the date hereof excluding any
non-standard improvements, including, but not limited to, any labs, special
electrical (such as any work to equip an office or cubicle for more than one
computer), mechanical or plumbing requirements, and all tel/data cabling. All
such non-standard improvements, as well as any changes or additions to the plan
on Exhibit B, shall be at Sublessee's sole cost and expense and shall be deemed
Additional Rent. Sublessor also acknowledges and agrees that it is obligated at
its sole cost and expense to restore the Subleased Premises at the end of the
Term substantially in accordance with Exhibit C including, without limitation,
the restoration of each circled and checked area of the plan on Exhibit C in
accordance with the plan on Exhibit C. Such cost and expense shall be deemed
Additional Rent. The "Additional Premises Rent Commencement Date" referred to in
Section 3 below shall mean the earlier of (i) such date as Sublessor delivers
the Additional Premises to Sublessee substantially complete and suitable for
Sublessee's use and occupancy but not in any event prior to April 1, 2000; (ii)
such date as Sublessee takes occupancy of any portion of the Additional Premises
for business purposes; or (iii) such date as the Additional Premises would have
been substantially complete but for a delay in the build-out attributable to any
change, addition or non-standard improvement to the plan in Exhibit B requested
by Sublessee. Notwithstanding the foregoing, Sublessee shall have the right, so
long as the same does not materially adversely affect the progress or completion
of Sublessor's work therein, to have access to the Additional Premises at least
two weeks prior to such substantial completion date for the purpose of
installing Sublessee's furnishings and equipment, without such access being
deemed to be occupancy for Sublessee's business purposes. Sublessor shall use
commercially reasonable efforts to deliver the Additional Premises substantially
complete and suitable for Sublessee's use and occupancy on or before June 10,
2000. In the event that the Additional Premises are not substantially complete
within ninety (90) days after June 10, 2000, as extended by any delay
attributable to any change, addition or non-standard improvement

                                      -2-
<PAGE>

requested by Sublessee or Sublessee's failure to promptly respond to Sublessor
requests for approvals or consents or by any other act or negligence of
Sublessee or Sublessee's agents, contractors or employees (together, "Sublessee
Delays") and by any delays caused by FORCE MAJEURE, which shall include strikes,
inability to obtain materials, casualties, and any other matters beyond
Sublessor's reasonable control, then Sublessee may terminate this Sublease by
providing written notice to Sublessor prior to substantial completion. If the
Additional Premises are not substantially complete by June 10, 2000, unless such
delay in substantial completion was due to Sublessee Delays or force majeure,
then Sublessee shall be entitled to an abatement of rent for the Additional
Premises until such Additional Premises are substantially complete.

     (4)  The Subleased Premises shall include the use of the Building Common
Areas (except as provided herein) and parking, cafeteria and fitness room (as
further described in Section 22 hereof). Notwithstanding anything to the
contrary herein (i) the Subleased Premises shall not include, and Sublessor
expressly reserves the exclusive use of (including continuous access to and
from) Telephone Closet No. 3129, it being understood that, except in emergency,
Sublessor shall use good faith efforts to give reasonable prior notice, which
may be oral, of its exercise of such access rights, and to minimize disruption
of Sublessee's use and enjoyment of the Subleased Premises; (ii) Sublessor and
Sublessee shall share appropriate usage of Telephone Closet No. 3052; (iii)
Sublessee's furnishings and usage of Activity Room 3020 shall be subject to
Sublessor's review and approval, which shall not be unreasonable, giving due
consideration to visibility of Activity Room 3020 from other portions of the
Building; (iv) Sublessee shall provide its own reception functions within the
Subleased Premises, and shall not have any right to representation at or
participation in Sublessor's reception on the first office level of the
Building; and (v) Sublessee shall be entitled to use the video kiosk closet No.
3094 for the purpose of installing its own video monitor consistent with section
5(a).

     2.   TERM.

     The term (the "Term") of this Sublease shall commence on April 1, 2000 (the
"Commencement Date"), and shall expire at 11:59 P.M. on March 31, 2003 (the
"Expiration Date"), unless sooner extended or terminated as hereinafter
provided.

     3.   FIXED RENT.

     (1)  For the period commencing on the Commencement Date and continuing
through and including the Additional Premises Rent Commencement Date, Sublessee
shall pay to Sublessor, in lawful money of the United States, a Fixed Rent at
the rate of One Million Five Thousand Dollars ($1,005,000.00) per annum
($83,750.00 per month). Concurrently with the execution of this Sublease,
Subtenant shall deliver to Sublandlord the first month's rent in the

                                      -3-
<PAGE>

amount of $83,750.00. For the period commencing on the Additional Space Rent
Commencement Date and continuing through and including the Expiration Date, such
Fixed Rent shall be payable at the rate of One Million Six Hundred Eighty-Six
Thousand Five Hundred Fifty-Seven and 57/100 Dollars ($1,686,557.50) per annum
($140,546.46 per month). For any partial month at the beginning of the Term, and
for any month during which the Additional Space Rent Commencement Date occurs,
Fixed Rent shall be appropriately prorated.

     (2)  Fixed Rent shall be due and payable on the first (1st) day of each
calendar month during the Term at the office of Sublessor, or at such other
place as Sublessor may designate by written notice, at any time from time to
time, without any set-off or deduction of any kind whatsoever, except that
Sublessee shall pay to Sublessor the first monthly installment of Fixed Rent due
under this Sublease (together with such electricity charges as shall be due in
accordance with Section 23 of this Sublease), upon the execution of this
Sublease.

     4.   ADDITIONAL RENT.

     (1)  Beginning with the payment of Fixed Rent due for the 13th full
calendar month of the Term, Sublessee shall pay to Sublessor, as Additional
Rent, Sublessee's Proportionate Share, as hereinafter defined, of such amounts
as Sublessor from time to time gives notice to Sublessee that Sublessor is
obligated to pay to Landlord in respect of Operating Costs, including estimated
payments thereof, under and pursuant to Section 4.2 of the Lease, but only to
the extent such payments on an annualized basis, exceed, or are reasonably
estimated by Sublessor to exceed, $9.50 per rentable square feet per year.
Sublessee shall be entitled to Sublessee's Proportionate Share of any credit or
refund as and when received by Sublessor, and shall pay Sublessee's
Proportionate Share of any additional payment request to be made by Sublessor
for Operating Costs in excess of $9.50 per rentable square feet per year as a
result of the final determination of Operating Costs for any calendar year as
Section 4.2 of the Lease provided. Sublessee's Proportionate share shall be a
fraction, the numerator of which is the rentable square feet in the Subleased
Premises and the denominator of which is the rentable square feet in the
Building, currently 50,345/201,378 or 25%.

     (2)  All amounts payable by Sublessee to Sublessor pursuant to this
Sublease, including, without limitation, Fixed Rent and Additional Rent, shall
be deemed to be and shall constitute rent for all purposes hereunder and, in the
event of any non-payment thereof, Sublessor shall have all of the rights and
remedies provided herein (including, without limitation, those rights and
remedies set forth in Section 10 hereof), at law or in equity for non-payment of
rent. The obligation of Sublessee to pay all amounts to Sublessor of Fixed Rent
and Additional Rent due hereunder and under the Lease arising during the term of
the Sublease, as incorporated herein and as modified hereby, shall survive the
Expiration Date or earlier termination of this

                                      -4-
<PAGE>

Sublease.

     5.   CARE, SURRENDER AND RESTORATION OF THE PREMISE.

     (1)  Without limiting any other provision of this Sublease or the Lease,
 Sublessee shall take good care of the Subleased Premises, suffer no waste or
injury thereto and shall comply with all laws, orders and regulations applicable
to the Subleased Premises, the Building and Sublessee's use or manner of use
thereof, which are imposed on Sublessor, as tenant under the Lease, in
connection with the Subleased Premises and/or the Building. Notwithstanding the
first paragraph of Section 6.1 of the Lease, Sublessee shall make no Alteration
(as defined in Article 6 of the Lease) to the Subleased Premises without the
prior written consent of Sublessor, and then only fully in compliance with the
applicable provisions of Article 6 of the Lease. In no event, however, shall
Sublessee have any right with respect to the elevator and atrium lobby area
(including Activity Room 3020) of the Subleased Premises either (i) to make any
Alteration, addition, modification, decoration or fixturing, or (ii) to use it
for any Sublessee purpose whatsoever, except as set forth herein, except that
Sublessor's approval shall not be unreasonably withheld or delayed for Building
standard furnishings and signage, or for furnishings and signage consistent with
other Building furnishings and signage, in such areas.

     (2)  Upon the Expiration Date or earlier termination of the Term, Sublessee
shall quit and surrender the Subleased Premises to Sublessor, broom clean, in
good order and condition, ordinary wear and tear excepted and Sublessee shall
remove all of its property therefrom. Sublessee shall observe and perform each
of the covenants contained in this Sublease.

     6.   USE.

     Sublessee shall use and occupy the Subleased Premises as and for office use
and for no other purpose.

     7.   SUBORDINATION TO AND INCORPORATION OF TERMS OF THE LEASE.

     (1)  This Sublease is in all respects subject and subordinate to all of the
terms, provisions, covenants, stipulations, conditions and agreements of the
Lease, and, except as otherwise expressly provided in this Sublease, all of the
terms, provisions, covenants, stipulations, conditions, rights, obligations,
remedies and agreements of the Lease (including but not limited to Article 14
(except for Section 14.3) of the Lease as to payment of Fixed Rent and
Additional Rent in accordance with the provisions hereof) are incorporated in
this Sublease by reference and made a part hereof as if herein set forth at
length, and shall, as between Sublessor and Sublessee (as if they were the
Landlord and Tenant, respectively, under the Lease, and the

                                      -5-
<PAGE>

word "Lease" were "Sublease"), constitute the terms of this Sublease, except for
Articles 2, 3, 4, Section 5.5, Article 9, Sections 14.2 (e), 14.3, 15.1, 16.1
and 16.3, Articles 17 and 20 and Sections 21.9 and 21.10, as well as such other
terms of the Lease as do not relate to the Subleased Premises or are
inapplicable to, inconsistent with, or specifically modified by, the terms of
this Sublease (which provisions, for purposes of this Sublease, are hereby
deemed deleted in their entirety). Sections 5.1 through 5.4 of the Lease are
incorporated herein expressly subject to the provisions of Section 9 hereof. In
furtherance of the foregoing, Sublessee shall not take any action or do or
permit to be done anything which (i) is or may be prohibited to Sublessor, as
tenant under the Lease, (ii) might result in a violation of or default under any
of the terms, covenants, conditions or provisions of the Lease or any other
instrument to which this Sublease is subordinate, or (iii) would result in any
additional cost or other liability to Sublessor. This clause shall be
self-operative and no further instrument of subordination shall be required, but
Sublessee shall execute promptly any certificate confirming such subordination
that Sublessor may request. In the event of any inconsistency between this
Sublease and the Lease, such inconsistency shall be resolved in favor of that
obligation which is more onerous to Sublessee or that restriction which is more
restrictive of Sublessee, as the case may be.

     (2)  In the event that the Lease is canceled or terminated due to default
of Sublessor, Sublessee shall, at the option of Landlord, attorn to and
recognize Landlord, as Sublessor hereunder, and shall, promptly upon Landlord's
request, execute and deliver all instruments necessary or appropriate to confirm
such attornment and recognition. Sublessor has disclosed to Sublessee that
Sublessor and Landlord dispute certain matters relating to the Lease including,
without limitation, whether Sublessor has performed in a timely manner all of
its obligations under the Lease. These disputes arose prior to the date of this
Sublease. So as of the date of this Sublease, Sublessor agrees to perform in a
timely manner all of its obligations under the Lease except to the extent they
are to be performed by Sublessee pursuant to the terms of this Sublease.

     8.   SUBLESSEE'S OBLIGATIONS.

     Except as specifically set forth herein to the contrary, all acts to be
performed by, and all of the terms, provisions, covenants, stipulations,
conditions, obligations and agreements to be observed by, Sublessor, as tenant
under the Lease, shall, to the extent that the same relate to the Subleased
Premises, be performed and observed by Sublessee, and Sublessee's obligations in
respect thereof shall run to Sublessor or Landlord, as Sublessor may determine
to be appropriate or as may be required by the respective interests of Sublessor
and Landlord. Sublessee shall indemnify, defend and hold Sublessor harmless from
and against all liabilities, losses, obligations, damages, penalties, claims,
costs and expenses (including, without limitation, attorneys' fees and other
costs) which are paid, suffered or incurred by Sublessor or claimed or asserted
against Sublessor as a result of or alleged to have resulted from the
nonperformance or

                                      -6-
<PAGE>

nonobservance of any such terms, provisions, covenants, stipulations,
conditions, obligations or agreements by Sublessee under this Sublease.

     9.   SUBLESSOR'S OBLIGATIONS.

     Sublessor agrees that except as expressly provided herein, Sublessee shall
have and enjoy the same rights which Sublessor, as tenant under the Lease, has
to performance by Landlord of any service, repair, alteration or other similar
obligation which is the obligation of Landlord to perform under those provisions
of the Lease incorporated herein, provided, however, that notwithstanding
anything contained in this Sublease to the contrary, Sublessor shall have no
responsibility to Sublessee for, and shall not be required to provide, any of
the services or make any of the repairs or restorations which Landlord has
agreed to make or provide, or cause to be made or provided, under the Lease
(including, without limitation, Landlord's obligations set forth in Article 5 of
the Lease) and Sublessee shall rely upon, and look solely to, Landlord for the
provision of such services and the performance of such repairs and restorations.
SUBLESSEE SHALL CONTACT SUBLESSOR'S FACILITY MANAGER, SPAULDING & SLYE COLLIERS
(OR SUCH OTHER PERSON OR ENTITY AS SUBLESSOR SHALL FROM TIME TO TIME IDENTIFY AS
ITS FACILITY MANAGER BY NOTICE TO SUBLESSEE), FOR ALL BUILDING CONCERNS SUCH AS
MAINTENANCE, JANITORIAL, CAFETERIA, FITNESS CENTER, PARKING, SECURITY AND OTHER
BUILDING RELATED ISSUES. Sublessee shall not make any claim against Sublessor
for any damage which may result from, nor shall Sublessee's obligations
hereunder (including, without limitation, Sublessee's obligation to pay all
Fixed Rent and Additional Rent when due be impaired by reason of (a) the failure
of Landlord to keep, observe or perform any of its obligations under the Lease,
or (b) the acts or omissions of Landlord or any of its agents, contractors,
servants, employees, invitees or licensees. If Landlord shall default in any of
its obligations to Sublessor with respect to the Subleased Premises, Sublessee
shall be entitled to request that Sublessor enforce Sublessor's rights against
Landlord with respect thereto. Sublessor agrees to use commercially reasonable
efforts to enforce Sublessor's rights against Landlord. In no event shall
Sublessor have any obligation to bring any action or proceeding against
Landlord. In the event of such default and in the event that Sublessor elects a
remedy that entitles Sublessor to rent abatement and Sublessor receives such
abatement, then Sublessor agrees to pass on to Sublessee a share of such
abatement to the extent it applies to the Subleased Premises.

     10.  COVENANTS WITH RESPECT TO THE LEASE.

     In the event that Sublessee shall be in default of any term, provision,
covenant, stipulation, condition, obligation or agreement of, or shall fail to
honor any obligation under, this Sublease, Sublessor, on giving the notice, if
any, required by the Lease (as modified pursuant to Section 15 hereof) and
subject to the right, if any, of Sublessee to cure any such default within any
applicable grace period provided in the Lease (as modified pursuant to Section
15 hereof),

                                      -7-
<PAGE>

shall have available to it all of the remedies available to Landlord under the
Lease including without limitation Section 14.2 of the Lease (with the words
"Fixed Rent" substituted for "Base Rent" and "Additional Rent" substituted for
"Operating Costs") in the event of a default or failure on the part of the
Sublessor, as tenant thereunder. Such remedies shall be in addition to all other
remedies available to Sublessor at law or in equity.

     11.  BROKER .

     Sublessor and Sublessee each represent and warrant to the other that
neither has dealt with any broker or finder in connection with this Sublease
other than Trammell Crow Company and CRF Partners (the "Brokers") and Sublessor
and Sublessee each agree to indemnify, defend and hold the other harmless from
and against any and all liabilities, losses, obligations, damages, penalties,
claims, costs and expenses (including, without limitation, attorneys' fees and
other charges) arising out of (i) any breach of the foregoing representation
and/or (ii) any claim, demand or proceeding for a real estate brokerage
commission, finder's fee or other compensation made by any person or entity
other than the Brokers in connection with this Sublease claiming to have dealt
with the indemnifying party and not such other party. If, as and when this
Sublease is executed, and the first month's Fixed Rent is paid, Sublessor shall
pay the Brokers 50% of the fee and commission due them pursuant to a separate
agreement, with the remaining 50% commission to be paid upon occupancy of and
the commencement of payments of Fixed Rent by Sublessee for the Additional
Premises.

     12.  INDEMNIFICATION OF SUBLESSOR AND SUBLESSEE.

     (1)  Sublessee agrees to indemnify, defend and hold Sublessor harmless
from, any and all liabilities, losses, obligations, damages, penalties, claims,
costs and expenses (including, without limitation, attorneys' fees and other
charges) which are paid, suffered or incurred by Sublessor or claimed or
asserted against Sublessor as a result of or alleged to have resulted from (a)
any personal injuries or property damage occurring in, on or about the Subleased
Premises during the Term other than due wholly to the negligence of Sublessor,
(b) any work or thing done, or any condition created, by Sublessee in, on or
about the Subleased Premises or the Building during the Term, or (c) any act or
omission of Sublessee or Sublessee's agents, contractors, servants, employees,
invitees or licensees during the Term.

     (2)  Sublessor agrees to indemnify, defend and hold Sublessee harmless
from, any and all liabilities, losses, obligations, damages, penalties, claims,
costs and expenses (including, without limitation, attorneys' fees and other
charges) due to or arising out of (i) Sublessor's use of the Telephone Closets
as further described in Section 1(d) hereof or (ii) any willful or negligent act
or omission by Sublessor or anyone for whom Sublessor is legally responsible,
other than due

                                      -8-
<PAGE>

wholly to the negligence of Sublessee. In no event shall Sublessor be liable for
any indirect incidental, special, punitive or consequential damages, including
lost profit or revenues, even if informed of their possibility.

     13.  TERMINATION OF LEASE.

     If the term of the Lease is terminated prior to the Expiration Date, then,
subject to Section 7(b) hereof, this Sublease shall immediately terminate and
Sublessor shall not be liable to Sublessee by reason thereof.

     14.  APPROVALS OR CONSENTS.

     In all provisions of the Lease requiring the approval or consent of
Landlord, Sublessee shall be required to obtain the express written approval or
consent of Sublessor.

     15.  TIME LIMITS.

     The parties agree that unless otherwise expressly modified herein, the time
limits set forth in the Lease for the giving of notices, making demands, payment
of any sum, the performance of any act, condition or covenant, or the exercise
of any right, remedy or option, are modified for the purpose of this Sublease by
(i) shortening the same in each instance by three (3) business days (but never
to less than two (2) calendar days) if requiring performance by Sublessee, and
(ii) by lengthening the same in each instance by three (3) business days if
requiring performance by Sublessor, so that notices may be given, demands made,
any act, condition or covenant performed and any right or remedy hereunder
exercised, by Sublessor or Sublessee, as the case may be, within the time limits
relating thereto contained in the Lease. Sublessor and Sublessee shall, promptly
after receipt thereof, furnish to each other a copy of each notice, demand or
other communication received from Landlord with respect to the Subleased
Premises.

     16.  ASSIGNMENT AND SUBLETTING.

     (1)  Sublessee shall not assign, sublet, mortgage, pledge or encumber this
Sublease, the Subleased Premises, or any interest in the whole or in any portion
thereof, without the prior written consent of Sublessor (which consent shall not
be unreasonably withheld or delayed). For purposes of this Article 16, a
transfer, in one transaction or a series of transactions, of a controlling
interest in the capital stock or other ownership or membership interests in
Sublessee shall be deemed to be an assignment of this Sublease. If Sublessee
makes any such assignment, mortgage, sublease or pledge (whether with or without
Sublessor's written consent), Sublessee named herein shall nonetheless remain
primarily liable for the performance and observation of all

                                      -9-
<PAGE>

of the terms of this Sublease required to be observed or performed by Sublessee
hereunder. Fifty percent (50%) of the amount by which any rentals, fees and
charges from time to time received by Sublessee in connection with any such
assignment or sublease (after first netting out any reasonable brokerage and
re-letting expenses actually incurred by Sublessee), exceed the Fixed Rent and
Additional Rent payable to Sublessor hereunder (hereinafter referred to as
"Excess Rental") shall be paid immediately by Sublessee to Sublessor as
Additional Rent under this Sublease. In such event, the Fixed Rent and
Additional Rent payable by Sublessee to Sublessor under this Sublease for the
balance of the Sublease Term shall be increased by an amount equal to the Excess
Rental. In addition, Sublessor shall have the option, in its sole discretion, to
terminate this Sublease effective as of the proposed effective date of any
assignment or sublease, by giving Sublessee written notice thereof within ten
(10) days after Sublessor's receipt of said notice front Sublessee; and in the
event Sublessee shall propose to sublet only a portion of the Subleased
Premises, Sublessor shall have the additional option to terminate this Sublease
as to that portion of the Subleased Premises proposed to be sublet. Should
Sublessor not elect to so terminate this Sublease in connection with any
proposed subletting or assignment, Sublessor shall continue to have the right to
disapprove same (subject to the terms herein). Upon any subletting or assignment
by Sublessee in accordance with the terms hereof, any extension option granted
herein other than a permitted assignment pursuant to Paragraph 16 (3) shall
become null and void. Consent by Sublessor to one or more assignments or
sublettings shall not operate as a waiver of Sublessor's rights as to any
subsequent assignments or sublettings.

     (2)  If Sublessee should desire to assign this Sublease or sublet the
Subleased Premises (or any part thereof), Sublessee shall give Sublessor written
notice thirty (30) days in advance of the proposed effective date of any
proposed assignment or sublease, specifying (i) the name, current address, and
business of the proposed assignee or sublessee, (ii) the amount and location of
the space within the Subleased Premises proposed to be so subleased, (iii) the
proposed effective date and duration of the assignment or subletting, and (iv)
the proposed rent or consideration to be paid to Sublessee by such assignee or
sublessee. Sublessee shall promptly supply Sublessor with financial statements
and other information as Sublessor may reasonably request to evaluate the
proposed assignment or sublease. Sublessee agrees to reimburse Sublessor for
Sublessor's reasonable attorney's fees incurred.

     (3)  Notwithstanding anything to the contrary in this Sublease, Sublessee
shall have the right, for which Sublessor's prior written consent shall not be
withheld or delayed, at any time, and from time to time to transfer to any
entity into or with which Sublessee is merged or consolidated, or to which
substantially all of Sublessee's assets are transferred, or to any corporation
that controls or is controlled by Sublessee, or is under common control with
Sublessee, provided in any of such events (a) the successor to Sublessee has a
net worth (computed in accordance with generally accepted accounting principles)
of at least $50,000,000,

                                      -10-
<PAGE>

and (b) proof satisfactory to Sublessor of such net worth shall have been
delivered to Sublessor within five (5) days after the effective date of any such
transaction. In the event of such a transfer, Sublessor shall have the right to
increase the security deposit if in its reasonable opinion it deems such
increase appropriate. This covenant and assignment shall run with the land and
shall bind Sublessee and Sublessee's heirs, executors, administrators, personal,
representatives, successors and assigns.

     (4)  If Sublessee assigns, sublets or makes any other transfer of all or
any portion of its interest(s) hereunder, Sublessee named in this Sublease shall
remain directly arid primarily responsible for the faithful performance and
observance of all of the covenants and obligations on Sublessee's part to be
performed in this Sublease.

     (5)  Any assignee or subtenant hereunder shall be bound by and shall comply
with all of the terms and provisions in this Sublease. As a condition to the
effectiveness of any assignment that is permitted hereunder, the assignee shall,
by an instrument in writing, within five (5) days after the effective date of
the applicable transaction assume and agree to perform (for the express benefit
of Sublessor) the terms hereof; and as a condition to the effectiveness of any
sublease that is permitted hereunder, the subtenant shall acknowledge in writing
(for the express benefit of Sublessor) within five (5) days after the effective
date of the applicable transaction the existence of this Sublease and shall
covenant not to do or permit to be done anything that would constitute a breach
thereof.

     (6)  Notwithstanding anything contained in this Paragraph 16 to the
contrary, provided Sublessee is not in default hereunder, Sublessor shall not
unreasonably withhold or delay its consent to Sublessee's request to assign this
Sublease or to sublease the Subleased Premises. In determining the
reasonableness of Sublessor's approval of or failure to consent to Sublessee's
assignment of this Sublease or the subleasing of the Subleased Premises,
Sublessor may take into consideration all relevant factors surrounding the
proposed sublease and assignment, including without limitation, the following:

          (1)  the business reputation of the proposed assignee or subtenant and
               its partners, officers, directors and stockholders;

          (2)  the nature of the business and the proposed use of the Subleased
               Premises by the proposed assignee or subtenant;

          (3)  the financial condition of the proposed assignee or subtenant;

          (4)  the effect that the proposed assignee or subtenant would have on
               the

                                      -11-
<PAGE>

               operations and maintenance of the Building;

          (5)  whether or not the proposed assignee or subtenant is presently a
               competitor (or subsidiary, affiliate or parent of a competitor);

          (6)  restrictions, if any, contained in other leases or agreements
               affecting the Building;

          (7)  the extent to which the proposed subtenant or assignee and
               Sublessee provide Sublessor with assurances reasonably
               satisfactory to Sublessor as to the satisfaction of Sublessee's
               obligations hereunder, including the payment of rent;

          (8)  restrictions, if any, imposed by the holder of any mortgage
               encumbering the Building or any portion thereof;

taking into account the fact that the Building is Sublessor's corporate
headquarters and that portions of the Subleased Premises are visible from
Building common areas, including the atrium, and from other premises occupied by
Sublessor and by other tenants.

     17.  END OF TERM.

     Sublessee acknowledges that possession of the Subleased Premises must be
surrendered to Sublessor onthe Expiration Date or earlier termination of this
Sublease (subject to the force majeure) in the same condition as set forth in
Section 5(b) hereof, subject to normal wear and tear, casualty or condemnation.
Sublessee agrees to indemnify, defend and hold Sublessor harmless from, any and
all liabilities, losses, obligations, damages, penalties, claims, costs and
expenses (including, without limitation, attorney's fees and other charges)
which are paid, suffered or incurred by Sublessor as a result of the failure of,
or the delay by, Sublessee in so surrendering the Subleased Premises, including,
without limitation, any claims made by Landlord or any succeeding tenant founded
on such failure or delay.

     18.  DESTRUCTION, FIRE AND OTHER CASUALTY.

          [Intentionally Omitted]

     19.  EMINENT DOMAIN.

     With respect to Section 11.2 of the Lease, in the event Sublessor receives
an award for

                                      -12-
<PAGE>

relocation benefits and moving expenses Sublessee shall be entitled to a share
provided that (i) Sublessee advanced Sublessor its proportionate share of the
expenses incurred by Sublessor in connection with any effort to obtain such an
award and (ii) the condemnation or taking adversely affects Sublessee.

                                      -13-
<PAGE>

     20.  NOTICES.

     Any notice, request or demand ("Notice") permitted or required to be given
by the terms and provisions of this Sublease, or by any law or governmental
regulation, either by Sublessor or Sublessee, shall be in writing. Unless
otherwise required by law or regulation, all Notices shall be given and shall be
deemed to have been served and given by either of the parties hereto and
received by the other party, on the date when the party giving the Notice shall
have mailed the Notice by any nationally recognized overnight delivery service
(with signature required) or hand delivered the Notice (with signature
required), addressed to the other party at the address of the other party first
set forth above. A copy of all Notices sent (i) to Sublessor shall be sent to
the address set forth on the first page of this Sublease, Attention: General
Counsel and (ii) to Sublessee shall be sent to the address set forth in the
preface of this Sublease (to the attention of Facility Manager), with a copy to
Hutchins, Wheeler and Dittmar, 101 Federal Street, Boston, Massachusetts 02110,
Attention: Anthony J. Medaglia, Jr., P.C. Either party hereto may designate a
different address for Notices to such party by serving Notice of such change in
accordance with this Section 19.

     21.  EXTENSION.

     Sublessor may, at its sole election, give notice to Sublessee at least
twelve (12) months prior to the Expiration Date, of Sublessor's good faith
determination that all or a substantial portion of the Subleased Premises is or
will be needed by Sublessor within the two (2) years following the Expiration
Date for actual occupancy by Sublessor or one or more of its affiliates. Unless
Sublessor shall give timely such notice, Sublessee shall have the option, by
notice to Sublessor at least nine (9) months' prior to the Expiration Date, to
extend the Term of this Sublease for one (1) period of two (2) years. If
Sublessee fails to give timely such notice of extension, Sublessee's extension
option shall be conclusively deemed waived and of no further force or effect,
time being of the essence. Said extension option is further subject to the
conditions that Sublessee shall not then (x) have assigned this Sublease or
sublet more than twenty-five (25%) percent of the Subleased Premises other than
a permitted assignment pursuant to Paragraph 16 (3) or (y) be in default under
this Sublease beyond such grace or cure period, if any, as may be applicable to
such default. The rate of Fixed Rent payable by Sublessee during such two-year
extension period shall be the higher of (i) the Fixed Refit and Additional Rent
payable during the then current lease year immediately proceeding such two-year
extension period or (ii) Fixed Rent determined pursuant to the method for
determining "Base Rent" set forth in subsection (c) (but not subsection (d)) of
Section 2.3 of the Lease, except that "Extension Market Rate" shall mean the
fair market rental rate for the Subleased Premises in its then "as is" condition
for such two-year extension term, upon and otherwise upon and subject to the
other terms and provisions of this Sublease, with "Sublessor" substituted for
"Landlord" and

                                      -14-
<PAGE>

"Sublessee" substituted for "Tenant".

     22.  SECURITY DEPOSIT.

     Sublessee shall deposit with Sublessor, as security for the faithful
performance and observance by Sublessee of the terms, conditions, covenants and
provisions of this Sublease, including the timely and proper surrender of
possession of the Subleased Premises the following security:

     (1)  Sublessee shall deliver to Sublessor upon execution of this Sublease a
clean, irrevocable, non-documentary (other than the sight draft referred to
therein) and unconditional Letter of Credit (the "Letter of Credit") in an
amount equal to Eight Hundred Forty-Three Thousand Two Hundred Seventy-Eight and
75/100 Dollars ($843,278.75) (the "Security Deposit" issued by and drawn upon
any commercial bank (hereinafter referred to as the "Issuing Bank") with offices
for banking purposes in the City of Boston and which shall mean FleetBoston Bank
or any other bank, trust company, national banking association or savings and
loan association which (or the parent company of which) have outstanding
unsecured, uninsured and unguaranteed indebtedness that is then rated, without
regard to qualification of such rating by symbols as "+" or "-" or numerical
notation, "Aa" or better by Moody's Investors Service and "AA" or better by
Standard & Poor's Corporation, and has combined capital, surplus and undivided
profits of not less than $500,000,000.00, which Letter of Credit shall have a
term of not less than one year, be in form and content satisfactory to
Sublessor, be for the account of Sublessor and be fully transferable by
Sublessor in its entirety, but not in part, without the payment of any fees or
charges, if being agreed that if any such fees or charges shall be so imposed,
then such fees or charges shall be paid by Sublessee. The Letter of Credit shall
provide that it shall be deemed automatically renewed, without amendment, for
consecutive periods of one year each thereafter during the term of this Lease,
unless the Issuing Bank sends notice (the "Non-Renewal Notice") to Sublessor by
certified mail, return receipt requested, not less than thirty (30) days next
preceding the then expiration date of the Letter of Credit that it elects not to
have such Letter of Credit renewed. Additionally, the Letter of Credit shall
provide that Sublessor shall have the right, exercisable within twenty (20) days
of its receipt of the Non-Renewal Notice, by sight draft on the Issuing Bank to
receive the monies represented by the existing Letter of Credit and to hold such
proceeds pursuant to the terms of this Paragraph 21 as a cash security pending
the replacement of such Letter of Credit. In the event that Tenant defaults in
respect of any of the terms, provisions, covenants or conditions of this
Sublease, including, but not limited to, the payment of Fixed Rent and
Additional Rent, beyond the expiration of any applicable grace period, Sublessor
may notify the Issuing Bank and thereupon receive all the monies represented by
the Letter of Credit and use, apply or retain the whole or any part of such
proceeds, to the extent required for the payment of any Fixed Rent or Additional
Rent or any other sum as to which Sublessee is in default or for any sum which
Sublessor may expend or

                                      -15-
<PAGE>

may be required to expend by reason of Sublessee's default in respect of any of
the terms, provisions, covenants or conditions of this Sublease, including, but
not limited to, any damages or deficiency in the reletting of the Subleased
Premises, whether such damages or deficiency accrue or accrues before or after
summary proceedings or other reentry by Sublessor. If Sublessor applies or
retains any part of the proceeds of the Letter of Credit, Sublessee, upon
demand, shall deposit with Sublessor the amount so applied or retained so that
Sublessor shall have the full deposit on hand at all times during the Term. If
Sublessee shall surrender the Subleased Premises to Sublessor in accordance with
this Sublease and shall pay all Fixed Rent and Additional Rent due hereunder in
full through and including the Expiration Date of this Sublease and no other
default shall have occurred and be continuing, the Letter of Credit shall be
returned to Sublessee within thirty (30) days after the Expiration Date and
delivery of the entire possession of the Subleased Premises to Sublessor.
Sublessee expressly agrees that Sublessee shall have no right to apply any
portion of the Security Deposit against any Sublessee's obligations to pay Fixed
Rent or Additional Rent hereunder and, if Sublessee shall seek to so apply such
Security Deposit, Sublessee shall pay liquidated damages to Sublessor in a sum
equal to two (2) times the amount of any such unpaid Fixed Rent or Additional
Rent. In the event of a transfer or assignment of the Sublease, within thirty
(30) days of notice of such sale or leasing, Sublessee at its sole cost and
expense, shall arrange (i) for the transfer of the Letter of Credit to the new
sublandlord as designated by Sublessor in such notice or (ii) to have the Letter
of Credit reissued in the name of the new sublandlord; and Sublessor shall
thereupon be released by Sublessee from all liability for the return of such
security. Sublessee shall look solely to the new sublandlord for the return of
such Letter of Credit and the provisions hereof shall apply to every transfer or
assignment made of the security to a new sublandlord. Sublessee further
covenants and agrees that it shall not assign or encumber or attempt to assign
or encumber the Letter of Credit deposited herein as security and that neither
Sublessor nor its successors or assigns shall be bound by any such assignment,
encumbrance, attempted assignment or attempted encumbrance.

     (2)  Notwithstanding anything to the contrary contained in this Sublease,
provided that no default, beyond any applicable notice and grace period, shall
have occurred and be continuing as of any Reduction Date, then the Security
Deposit shall be reduced over the Term as follows: (i) upon the first (1st)
anniversary of the Commencement Date, the Security Deposit shall be reduced to
an amount equal to Five Hundred Sixty-Two Thousand, One Hundred Eighty-Five and
83/100 Dollars ($562,185.83); (ii) upon the second (2nd) anniversary of the
Commencement Date, the Security Deposit shall be reduced, and shall remain for
the balance of the Term at, to an amount equal to Two Hundred Eighty-One
Thousand Ninety-Two-and 92/100 Dollars ($281,092.92) (each of the anniversary
dates provided for in (i) and (ii) above is individually a "Reduction Date" and
collectively, the "Reduction Dates"). In connection with such reduction,
provided that Sublessee shall tender to Sublessor a replacement or amended
Letter of Credit in

                                      -16-
<PAGE>

the appropriately reduced amount of the Security Deposit, Sublessor shall
promptly exchange the Letter of Credit then held by Sublessor for the Letter of
Credit tendered by Sublessee in the reduced amount set forth above. In the
alternative, and provided that no default, beyond any applicable notice and
grace period, shall have occurred and be continuing as of any Reduction Date,
Sublessor shall, within ten (10) business days following request from Sublessee
furnish to the Issuing Bank a letter signed by Sublessor acknowledging that no
default by Sublessee has occurred and is continuing beyond applicable notice and
grace, and agreeing to such reduction of the Security Deposit as provided above.

     23.  OTHER SUBLESSEE RIGHTS.

     Sublessee shall have the fight to use, on a non-reserved basis, a maximum
of 166 of the parking spaces made available to Sublessor pursuant to Section 4.4
of the Lease on Levels 3, 4 and 5 of the Parking Facility. Sublessor reserves
the right to regulate and control such parking usage by Sublessee its employees,
licensees and invitees with parking stickers, tags, cards or any other
reasonable procedure. Sublessee shall participate and cooperate in such control
procedure and agrees that in the event of excess parking by Sublessee, its
employees, licensees or invitees ("Parking Default"), any of the offending
vehicles or other Sublessee vehicles may be denied parking privileges and/or
towed at Sublessee's expense and Sublessee may be subjected to a fine or penalty
of $250.00 per vehicle, which tow charges and fines or penalties shall be
payable as Additional Rent on each occasion. Sublessor shall attempt in good
faith, but shall have no obligation, to contact Sublessee prior to towing any
offending vehicle. In the event of such Parking Default (and without in any way
limiting Sublessor's rights to tow, charge fees, or deny privileges as described
above), Sublessee will give written notice of the Parking Default ("Parking
Default Notice"), and Sublessee shall have ten (10) business days to remedy such
Parking Default. If during any twelve (12) month period Sublessor shall give
Sublessee a Parking Default Notice on three (3) occasions, then commencing with
the fourth occasion and any subsequent occasion during such twelve (12) month
period, Sublessee shall pay Sublessor 125% of the monthly rent for each month
such Parking Notice Default is given. In addition, in any twelve (12) month
period, after the second occasion of Sublessor giving Sublessee a Parking
Default Notice, Sublessee agrees to pay any reasonable costs incurred by
Sublessor to offset the cost of monitoring Sublessee's parking, including, but
not limited to, the hiring of additional personnel, upgrading security access
card software, or signage/space identification programs. Sublessee shall have
the right to Building standard signage in the interior lobby of the Subleased
Premises and to representative inclusion in the Building lobby directory.
Employees of Sublessee shall have the right to use the cafeteria, as well as the
fitness center in the Building from time to time maintained by Sublessor,
subject to such rules and regulations and, in the case of the fitness center the
payment of such per employee annual fee Sublessor may reasonably establish from
time to time.

                                      -17-
<PAGE>

     24.  ELECTRICITY CHARGE.

     Sublessee shall pay monthly, as Additional Rent, as and when payments of
Fixed Rent are due, an electricity charge equal to the sum of Four Thousand One
Hundred Ninety-Five and 42/100 Dollars ($4,195.42) in respect of Sublessor's
costs of providing electricity to the Subleased Premises. Sublessee's use of
electricity within or serving its uses of the Subleased Premises shall not
exceed that reasonably required for normal office use. If Sublessor at any time
reasonably determines that Sublessee's use of electricity exceeds reasonable
requirements for normal office use, and Sublessor elects to permit such excess
usage, Sublessor may, at Sublessee's expense, submeter such space and the
electricity charge payable monthly by Sublessee shall be adjusted to such amount
as Sublessor from time to time reasonably estimates based upon such submetering
and specifies by notice to Sublessee, with periodic adjustments, not less
frequently than annually, as Sublessee's actual usages are known.

     25.  SUBLESSEE'S INSURANCE.

     (1)  Sublessee shall obtain and keep in full force and effect during the
term of this Sublease:

          (1)  a policy of commercial general public liability insurance, on a
               primary and non-contributory basis, including bodily injury and
               property damage, with a broad form contractual liability
               endorsement or the then equivalent of such coverage, protecting
               Sublessee, Sublessor, Sublessor's employees and agents and any
               other parties designated by Sublessor having an interest in the
               Subleased Premises, as additional insureds, on an occurrence
               basis against claims for personal injury, death and/or property
               damage occurring in or about the Subleased Premises, and under
               which the insurer agrees to indemnify, defend and hold Sublessee
               harmless from and against, among other things, all cost, expense
               and/or liability arising our of or based upon any and all claims,
               accidents, injuries and damages for which Sublessee shall be
               liable in accordance with this Sublease and the Lease, with any
               umbrella and primary commercial general liability policy on a
               coterminous basis. The minimum limits for liability shall be a
               combined single limit with respect to each occurrence in an
               amount of not less than $5,000,000 for injury (or death) and
               damage to property (or in any increased amount reasonably
               required by Sublessor); and

          (2)  insurance against loss or damage by fire, and such other risks
               and hazards

                                      -18-
<PAGE>

               (including burglary, theft, vandalism, sprinkler leakage damage,
               breakage of glass within the Subleased Premises as are insurable
               under then available standard forms of "all risk" insurance
               policies, to Sublessee's property and Sublessee's alterations for
               the full replacement cost value thereof (including an "agreed
               amount" endorsement having a deductible amount, if any, as shall
               be determined by Sublessee in the exercise of Sublessee's
               commercially reasonable discretion);

          (3)  during the performance of any alteration, until completion
               hereof, builder's risk insurance, with no restrictions on
               coverage on an "all risk" basis and on a completed value form for
               full replacement value covering the interests of Sublessor and
               Sublessee, with Sublessor as a named insured; and

          (4)  worker's compensation insurance as required by law, with express
               waiver of subrogation for the benefit of Sublessor.

     (2)  Prior to the time such insurance is first required to be carried by
Sublessee and thereafter, at least thirty (30) days prior to the expiration of
any such policies, Sublessee agrees to deliver to Sublessor evidence of payment
for the policies together with certificates evidencing such insurance. All such
certificates shall contain endorsements that (a) such insurance may not be
modified or canceled or allowed to lapse except upon thirty (30) days' written
notice to Sublessor by certified mail, return receipt requested, containing the
policy number and the names of the insured and the certificate holder, and (b)
Sublessee shall be solely responsible for payment of all premiums under such
policies and Sublessor shall have no obligation for the payment thereof
notwithstanding that Sublessor is or may be named as an insured. Sublessee's
failure to provide and keep in force the aforementioned insurance shall be
regarded as a material default hereunder, entitling Sublessor to exercise any or
all of the remedies as provided in this Sublease in the event of Sublessee's
default. All insurance required to be carried by Sublessee pursuant to the terms
of this Sublease shall be effected under valid and enforceable policies issued
by reputable and independent insurers permitted to do business in The
Commonwealth of Massachusetts and rated in Best's Insurance Guide, or any
successor thereto (of if there be none, an organization having a national
reputation) as having a general policy-holder rating of "A" and a financial
rating of at least "XIII". Sublessee shall not carry separate or additional
insurance, concurrent in form or contributing, in the event of any loss or
damage, with any insurance required to be obtained by Sublessee under this
Sublease.

     (3)  Sublessee shall procure an appropriate clause in, or endorsement on,
any such "all risk" or fire or extended coverage insurance covering the
Subleased Premises, the personal

                                      -19-
<PAGE>

property, fixtures or equipment located thereon or therein, pursuant to which
the insurance company waives subrogation or consents to a waiver of right of
recovery by the insured prior to any loss. It is expressly understood and agreed
that Sublessor will not be obligated to carry insurance on Sublessee's property
or Sublessee's work or insurance against interruption of Sublessee's business.

     (4)  Sublessee hereby releases Sublessor (its servants, agents, employees
and invitees) with respect to any claim (including a claim for negligence) which
Sublessee might otherwise have against Sublessor for loss, damage or destruction
with respect to its property by fire or casualty (including rental value or
business interruption, as the case may be) occurring during the term of this
Sublease.

     26.  GOVERNING LAW.

     The provisions of this Sublease shall be governed and interpreted in
accordance with the laws of The Commonwealth of Massachusetts.

     27.  MISCELLANEOUS.

     (1)  This Sublease may not be modified, amended, extended, renewed,
terminated or otherwise modified by either Sublessor or Sublessee except by a
written instrument signed by both of the parties hereto.

     (2)  It is acknowledged and agreed that all understandings and agreements
heretofore had between the parties hereto are merged in this Sublease, which
alone fully and completely expresses their agreement with respect to the subject
matter hereof. This Sublease has been executed and delivered after full
investigation by each of the parties hereto, and neither party hereto has relied
upon any statement, representation or warranty which is not specifically set
forth in this Sublease.

     (3)  This Sublease does not constitute an offer to sublease the Subleased
Premises to Sublessee and Sublessee shall have not rights with respect to the
leasing of the Subleased Premises unless and until Sublessor, in its sole and
absolute discretion, elects to be bound hereby executing and unconditionally
delivering to Sublessee an original counterpart hereof.

     (4)  Sublessee acknowledges that Sublessor has disclosed to Sublessee
various matters of dispute between Sublessor and Landlord, including a notice of
an Event of Default which Sublessor is contesting.

                                      -20-
<PAGE>

     28.  LANDLORD'S CONSENT.

     (1)  Sublessor and Sublessee each acknowledge and agree that this Sublease
is subject to the unconditional consent of Landlord, as required by Section 9.1
of the Lease. Sublessor shall diligently pursue Landlord's consent hereto in
accordance with the terms of the Lease, provided, however that in no event shall
Sublessor be required to expend any sums (other than reasonable legal fees
customarily incurred by sublessors in connection with obtaining consents for
subleases) or bring any lawsuits or other legal proceedings in order to obtain
such consent; and if Landlord shall fail or refuse to give such consent, such
failure or refusal shall in no event affect the validity or enforceability of-
this Sublease. In the event that Landlord's consent is not obtained within
thirty (30) days following the date hereof, either party shall have the right to
terminate this Sublease by notice to the other, upon which notice, this Sublease
shall be deemed terminated and of no further force and effect and neither party
shall have any liability to the other hereunder other than the return of
Sublessee's Security Deposit and any paid Rent.

                                      -21-
<PAGE>

     IN WITNESS WHEREOF, this Sublease has been duly executed as of the day and
year first above written.

                                       SUBLESSOR:

                                       RENAISSANCE WORLDWIDE, INC.

                                       By: /s/ Ronan P. O'Brian
                                           -------------------------------------
                                           Name: Ronan P. O'Brian
                                           Title: corporate Counsel

                                       SUBLESSEE:

                                       NETEGRITY, INC.

                                       By: /s/ James E. Hayden
                                           -------------------------------------
                                           Name: James E. Hayden
                                           Title: Vice Presedent and Treasurer

                                      -22-

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