LEASE dated as of the 31st day of May, 1996, between DEWEY SQUARE TOWER
ASSOCIATES, a Massachusetts partnership having an office at One Financial
Center, Boston, Massachusetts, c/o Rose Associates of Massachusetts, Inc.
(referred to as "Landlord"), and COLONIAL MANAGEMENT ASSOCIATES, INC., a
Massachusetts corporation (referred to as "Tenant").

                              W I T N E S S E T H:

Landlord and Tenant hereby covenant and agree as follows:


                                    ARTICLE 1

                          DEMISE, PREMISES, TERM, RENTS

      Section 1.01. Landlord hereby leases to Tenant and Tenant hereby hires
from Landlord the premises hereinafter described in the building located at
Dewey Square, Boston, Massachusetts, known as One Financial Center (said
building is referred to as the "Building", and the Building, together with the
Land, as defined in Article 2, is referred to as the "Real Property"), at the
annual rental rate or rates set forth in Section 1.03, and upon and subject to
all of the terms, covenants and conditions contained in this Lease. The premises
leased to Tenant, together with all appurtenances, fixtures, improvements,
additions and other property attached thereto or installed therein at the
commencement of, or at any time during, the term of this Lease, other than
Tenant's Personal Property (as defined in Article 5), are referred to,
collectively, as the "Demised Premises". The various portions of the Demised
Premises, the agreed rentable area thereof and the designation used herein to
reference such portions are as follows:

                               "Primary Premises":

                  entire ninth (9th) floor (23,847 square feet)
                 entire tenth (10th) floor (23,847 square feet)
                entire eleventh (11th) floor (23,847 square feet)
                entire twelfth (12th) floor (23,854 square feet)
               entire fourteenth (14th) floor (23,681 square feet)
             portion of thirteenth (13th) floor (14,058 square feet)

                             "Seventh Floor Space":

               portion of seventh (7th) floor (6,192 square feet)

                                "Expansion Area":

             portion of thirteenth (13th) floor (9,623 square feet)

The location of any portion of the Demised Premises consisting of less than an
entire floor is shown on the plans attached hereto as Exhibit A and made a part
hereof.

      Section 1.02. A. The Demised Premises are leased for a term (referred to
as the "Demised Term") to commence on the Commencement Date and to end on the
Expiration Date (as such terms are hereinafter defined), unless the Demised Term
shall sooner terminate pursuant to any of the terms, covenants or conditions of
this Lease or pursuant to law.

      B. In the case of the Primary Premises, the Commencement Date shall be
June 1, 1996 and the Expiration Date shall be May 31, 2006.

      C. In the case of the Seventh Floor Space, the Commencement Date shall be
September 11, 1996 and the Expiration Date shall be May 31, 2002. Tenant may, by
written notice to Landlord given on or before May 31, 2001, delay said
Expiration Date and extend the Demised Term applicable to the Seventh Floor
Space through May 31, 2006, on the same terms and conditions set forth herein.
Notwithstanding the foregoing, Landlord may, by notice to Tenant given on or
before November 30, 2000, rescind the foregoing option (despite the prior
exercise thereof by Tenant) in the event that the Seventh Floor Space is to be
leased to Federal Insurance Company, an Indiana corporation, or its successors
or assigns.

      D. The Commencement Date applicable to the Expansion Area shall be the
date on which Landlord delivers possession thereof to Tenant free and clear of
other tenants and occupants, having substantially completed the Work described
in Schedule A attached hereto and made a part hereof, or such sooner date on
which Tenant first conducts business in any part of the Expansion Area. Tenant
shall be entitled to a credit of $1,186 (referred to as the "Delay Credit") for
each day after September 24, 1997 (referred to as the "Construction Deadline")
on which said Commencement Date shall not have occurred for reasons other than
(i) delays or defaults attributable to Tenant or (ii) delays attributable to the
inclusion, as part of such Work, of a stairway connecting the Expansion Area to
other portions of the Demised Premises. Any such credit shall be applied against
installments of Fixed Rent becoming due hereunder. Promptly following the
substantial completion of such Work, Landlord shall obtain from the Boston
Inspectional Services Department a certificate authorizing the use and occupancy
of the Expansion Area pursuant to the applicable provisions of the Massachusetts
State Building Code and deliver a copy of said certificate to Tenant. Landlord
further agrees to indemnify and save Tenant harmless of and from all loss,
liability, penalties, fines, costs and expenses (including without limitation
reasonable counsel fees) incurred as a result of Tenant's being forced by
governmental authorities to cease business operations in the Expansion Area
following the Commencement Date applicable thereto on account of Landlord's
failure to have obtained said certificate. After the determination of the
Commencement Date applicable to the Expansion Area, each party agrees, upon
demand of the other, to execute, acknowledge and deliver to the other an
instrument, in the form attached hereto as Exhibit B and made a part hereof,
setting forth said Commencement Date. Landlord shall notify Tenant at least
fifteen (15) days in advance of the date on which Landlord reasonably
anticipates that the Commencement Date applicable to the Expansion Area will
occur. Following such notice, Tenant may, at its risk and subject to all
applicable terms and conditions of this Lease, prepare the Expansion Area for
occupancy so long as Tenant does not thereby interfere with the performance of
Landlord's Work hereunder. The Expiration Date applicable to the Expansion Area
shall be May 31, 2006.

      Section 1.03. A. Subject to application of the credit provided for in
Section 40.01, Tenant shall pay rent to Landlord at the annual rate (referred to
as "Fixed Rent") hereinafter set forth. In the case of the Primary Premises,
Fixed Rent shall be payable in accordance with the following schedule:

      With respect to the                 Fixed Rent shall be payable
       following period:                    at the annual rate of:
      -------------------                 ---------------------------
   June 1, 1996 - May 31, 2001            $3,994,020.00 ($30 psf)
   June 1, 2001 - May 31, 2006            $4,326,855.00 ($32.50 psf)

In the case of the Seventh Floor Space, Fixed Rent shall be payable in
accordance with the following schedule:

      With respect to the                 Fixed Rent shall be payable
      following period:                     at the annual rate of:
      -------------------                 ---------------------------
September 11, 1996 - May 31, 2001            $154,800.00 ($25 psf)
June 1, 2001 - May 31, 2006                  $185,760.00 ($30 psf)

In the case of the Expansion Area, Fixed Rent shall be payable in accordance
with the following schedule:

      With respect to the                 Fixed Rent shall be payable
      following period:                      at the annual rate of:
      -------------------                 ---------------------------
  Through May 31, 2001                      $288,690.00 ($30 psf)
  June 1, 2001 - May 31, 2006               $312,747.60 ($32.50 psf)

As used herein, the abbreviation "psf" refers to a Fixed Rent rate expressed as
a specified amount per rentable square foot. Whenever any provision of this
Lease provides for a proportional or other partial abatement of Fixed Rent, such
abatement shall be calculated by reference to the Fixed Rent allocable hereunder
to the applicable portion of the Demised Premises.

      B. The Fixed Rent and any additional rent payable pursuant to the
provisions of this Lease shall be payable by Tenant to Landlord at its office
(or at such other place as Landlord may designate in a notice to Tenant) in
lawful money of the United States which shall be legal tender in payment of all
debts and dues, public and private, at the time of payment, without prior demand
therefor and without any offset or deduction whatsoever except as otherwise
specifically provided in this Lease. The Fixed Rent shall be payable in equal
monthly installments in advance, on the first (1st) day of each month during the
Demised Term (except as otherwise provided in subsection C of this Section).

      C. Fixed Rent shall be prorated in the case of any month during which the
Commencement Date or the last day of the Demised Term occurs.

      Section 1.04. Tenant covenants (i) to pay the Fixed Rent and any
additional rent payable pursuant to the provisions of this Lease, and (ii) to
observe and perform, and to permit no violation of, the terms, covenants and
conditions of this Lease on Tenant's part to be observed and performed.


                                    ARTICLE 2

                                   DEFINITIONS

      Section 2.01. As used in this Lease, the following terms shall have the
following respective meanings:

      Alterations:  As defined in Section 4.01.

      Annual Expenses:  As defined in Section 23.01.

      Authority:  As defined in Section 8.01.

      Base Expenses:  As defined in Section 23.01.

      Building:  As defined in Section 1.01.

      Building Rules:  As defined in Section 35.01.

      business days: All days other than Saturdays, Sundays and holidays, as
defined in this Article.

      Commencement Date:  As defined in Section 1.02.

      Commonwealth Lease:  As defined in Section 8.01.

      Deficiency:  As defined in Section 19.01.

      Demised Premises:  As defined in Section 1.01.

      Demised Term:  As defined in Section 1.02.

      Electrical Inclusion Factor:

                                    The Electrical Inclusion
            With respect to the:       Factor shall be:
            -------------------         ---------------

            Primary Premises               $133,134
            Seventh Floor Space              $6,192
            Expansion Area                   $9,623

      Escalation Year:  As defined in Section 23.01.

      Events of Default:  As defined in Section 17.01.

      Expiration Date:  As defined in Section 1.02.

      FHWA:  As defined in Section 14.01.

      Fixed Rent:  As defined in Section 1.03.

      Holidays: All days (i) observed as legal holidays by either the City of
Boston, the Commonwealth of Massachusetts or the Federal Government, and (ii)
designated as holidays in any union contract covering building service employees
in the Building.

      HVAC:  As defined in Section 31.02.

      Included Improvements:  As defined in Section 23.01.

      Land: The land on which the Building is located, including that portion
thereof affected by the Commonwealth Lease, as defined in said Section 8.01,
including, without limitation, that portion of the land affected by the
Commonwealth Lease which is reserved to the Landlord thereunder and is included
in the term "Non-Leased Premises", as defined therein, and upon which structural
supports for a portion of the Building are located.

      Land Disposition Agreement:  As defined in Section 8.01.

      Landlord's Escalation Statement:  As defined in Section 23.01.

      Monthly Escalation Installment Notice:  As defined in Section 23.01.

      Mortgage:  As defined in Section 8.01.

      Non-Leased Premises:  (See definition of Land, above).

      Operating Expenses:  As defined in Section 23.01.

      Overtime Periods:  As defined in Section 31.06.

      Partnership Tenant:  As defined in Section 28.01.

      Person or persons: Shall include natural persons, firms, corporations,
associations, and any other private or public entities, whether any of the
foregoing are acting on their own behalf or in a representative capacity.

      Prime Rate: The rate of interest announced by State Street Bank and Trust
Company or its successor from time to time as its "Prime Rate".

      Real Property:  As defined in Section 1.01.

      Subletting Profit:  As defined in Section 12.03.

      Taxes:  As defined in Section 23.01.

      Tenant's Personal Property:  As defined in Section 5.01.

      Tenant's Proportionate Share:  As defined in Section 23.01.


                                    ARTICLE 3

                                USE AND OCCUPANCY

      Section 3.01. Tenant shall use and occupy the Demised Premises for general
office purposes.

      Section 3.02. Tenant shall not use or occupy, or permit the use or
occupancy of, the Demised Premises or any part thereof, for any purpose other
than the purpose specifically set forth in Section 3.01, or in any manner which,
in Landlord's reasonable judgment, (a) shall adversely affect or interfere with
(i) any services required to be furnished by Landlord to Tenant or to any other
tenant or occupant of the Building, or (ii) the proper rendition of any such
service or the cost thereof, or (iii) the use or enjoyment of any part of the
Building by any other tenant or occupant, or (b) shall tend to impair the
character or dignity of the Building.


                                    ARTICLE 4

                                   ALTERATIONS

      Section 4.01. Tenant shall not make or perform, or permit the making or
performance of, any alterations, installations, improvements, additions or other
physical changes in or about the Demised Premises (referred to collectively, as
"Alterations", which term shall exclude the Work to be performed by Landlord
pursuant to Schedule A) without Landlord's prior consent. Landlord agrees not to
unreasonably withhold or delay its consent to any nonstructural Alterations
proposed to be made by Tenant to adapt the Demised Premises for Tenant's
business purposes. Such consent shall not be required in the case of any
repainting or similar work of a purely cosmetic or decorative nature.
Notwithstanding the foregoing provisions of this Section or Landlord's consent
to any Alterations, all Alterations shall be made and performed in conformity
with and subject to the following provisions: All Alterations shall be made and
performed at Tenant's sole cost and expense and at such time and in such manner
as Landlord may, from time to time, reasonably designate; all Alterations shall,
when completed, be of such a character as not to materially reduce the economic
value of the Building below its value immediately before such Alterations; no
Alterations shall diminish or reduce the structural integrity of the Building;
Alterations shall be made only by contractors or mechanics approved by Landlord,
such approval not unreasonably to be withheld or delayed (notwithstanding the
foregoing, all Alterations requiring mechanics in trades with respect to which
Landlord has adopted or may hereafter adopt a list or lists of approved
contractors shall be made only by contractors selected by Tenant from such list
or lists, but only to the extent that such contractors offer competitive
pricing); no Alteration shall affect any part of the Building other than the
Demised Premises or adversely affect any service required to be furnished by
Landlord to Tenant or to any other tenant or occupant of the Building or reduce
the value or utility of the Building; no Alteration shall affect the outside
appearance of the Building or the color or style of any venetian blinds (except
that Tenant may remove any venetian blinds provided that they are promptly
replaced by Tenant with blinds of a similar type, material and color); all
business machines and mechanical equipment shall be placed and maintained by
Tenant in settings sufficient, in Landlord's reasonable judgment, to absorb and
prevent vibration perceptible outside the Demised Premises or noise or annoyance
to other tenants or occupants of the Building; Tenant shall submit to Landlord
reasonably detailed plans and specifications (including layout, architectural,
mechanical and structural drawings) for each proposed Alteration; prior to the
commencement of each Alteration, Tenant shall have procured and paid for, and
exhibited to Landlord, so far as the same may be required from time to time, all
permits and authorizations of all municipal departments and governmental
subdivisions and authorities having or claiming jurisdiction; prior to the
commencement of each proposed Alteration, Tenant shall furnish to Landlord
duplicate original policies of worker's compensation insurance covering all
persons to be employed in connection with such Alteration, including those to be
employed by all contractors and subcontractors, and of comprehensive public
liability insurance (including property damage coverage) in which Landlord, its
agents and any lessor under any ground or underlying lease shall be named as
parties insured, which policies shall be issued by companies, and shall be in
form and amounts, reasonably satisfactory to Landlord and shall be maintained by
Tenant until the completion of such Alteration; all Alterations in or to the
electrical facilities in or serving the Demised Premises shall be subject to the
provisions of subsection B of Section 31.04; all fireproof wood test reports,
electrical and air conditioning certificates, and all other permits, approvals
and certificates required by all governmental authorities shall be timely
obtained by Tenant and submitted to Landlord; all Alterations, once commenced,
shall be made promptly and in a good and workmanlike manner; notwithstanding
Landlord's approval of plans and specifications for any Alteration, all
Alterations shall be made and performed in full compliance with all applicable
laws, orders and regulations (including, but not limited to, the energy
conservation provisions of the Massachusetts Building Code) of Federal, State,
County and Municipal authorities and with all directions of all public officers,
and with all applicable rules, orders, regulations and requirements of the
Boston Board of Fire Underwriters and the New England Fire Insurance Rating
Organization or any similar body; all Alterations shall be made and performed in
accordance with the Building Rules; all materials and equipment to be installed,
incorporated or located in the Demised Premises as a result of any Alteration
shall be of first quality and condition; no such materials or equipment shall be
subject to any lien, encumbrance, chattel mortgage or title retention or
security agreement of any kind; in the event Landlord or its agents employ any
independent architect or engineer to examine any plans or specifications
submitted by Tenant to Landlord in connection with any proposed Alteration,
Tenant agrees to pay to Landlord a sum equal to any reasonable fees charged by
such architect or engineer to Landlord in connection therewith. Any consent or
approval required from Landlord pursuant to the provisions of this Section shall
be deemed to have been granted unless Landlord notifies Tenant to the contrary
within thirty (30) days following receipt of Tenant's written request therefor
so long as such request expressly and conspicuously recites the effect of
Landlord's failure to respond thereto as aforesaid.

      Section 4.02. In the event of any dispute between Landlord and Tenant as
to the reasonability of Landlord's failure or refusal to grant any consent or
approval requested by Tenant pursuant to the provisions of Section 4.01 with
respect to which Landlord has agreed to act reasonably, such dispute shall be
determined by arbitration in accordance with the provisions of Article 33.

      Section 4.03. Nothing in this Lease shall be deemed or construed in any
way as constituting the consent or request of Landlord, express or implied, by
inference or otherwise, to any contractor, subcontractor, laborer or
materialman, for the performance of any labor or the furnishing of any material
for any specific Alteration to, or repair of, the Demised Premises, the
Building, or any part of either. Any mechanic's or other lien filed against the
Demised Premises or the Building or the Real Property for work claimed to have
been done for, or materials claimed to have been furnished to, Tenant, or based
upon any act or omission or alleged act or omission of Tenant (excluding any
lien arising from the performance of the Work pursuant to Schedule A), shall be
discharged by Tenant, at Tenant's sole cost and expense, by filing any bond
required by law or otherwise, within ten (10) days after notice of the filing of
such lien.

      Section 4.04. Tenant shall not, at any time prior to or during the Demised
Term, directly or indirectly employ, or permit the employment of, any
contractor, mechanic or laborer in the Demised Premises, whether in connection
with any Alteration or otherwise, if such employment will interfere or cause any
labor conflict with other contractors, mechanics, or laborers engaged in the
construction, maintenance or operation of the Building by Landlord, Tenant or
others. In the event of any such interference or conflict, Tenant, upon demand
of Landlord, shall cause all contractors, mechanics or laborers causing such
interference or conflict to leave the Building immediately.


                                    ARTICLE 5

                            OWNERSHIP OF IMPROVEMENTS

      Section 5.01. All appurtenances, fixtures, improvements, additions and
other property attached to or installed in the Demised Premises, whether by
Landlord or Tenant or others, and whether at Landlord's expense, or Tenant's
expense, or the joint expense of Landlord and Tenant, shall be and remain the
property of Landlord. Notwithstanding the foregoing, any such fixtures,
improvements, additions and other property installed at the sole expense of
Tenant with respect to which Tenant has not been granted any credit or allowance
by Landlord, whether pursuant to Schedule A or otherwise, and which are
removable without material damage to the Demised Premises, shall be and remain
the property of Tenant and are referred to as "Tenant's Personal Property". Any
replacements of any property of Landlord, whether made at Tenant's expense or
otherwise, shall be and remain the property of Landlord.


                                    ARTICLE 6

                                     REPAIRS

      Section 6.01. Tenant shall take good care of the Demised Premises
(excluding those areas reserved to Landlord pursuant to the provisions of
Section 14.02) and, at Tenant's sole cost and expense, shall make all repairs
and replacements, structural and otherwise, ordinary and extraordinary, foreseen
and unforeseen, as and when needed to preserve the Demised Premises in good and
safe working order and in first class repair and condition, except for damage by
fire or other casualty for which Tenant is not otherwise liable and except
further that Tenant shall not be required to make any such structural repairs or
structural replacements to the Demised Premises unless necessitated or
occasioned by the acts, omissions or negligence of Tenant or any person claiming
through or under Tenant, or any of their servants, employees, contractors,
agents, visitors or licensees, or by the use or occupancy or manner of use or
occupancy of the Demised Premises by Tenant or any such person. Without
affecting Tenant's obligations set forth in the preceding sentence, Tenant, at
Tenant's sole cost and expense, shall also (i) make all replacements, as and
when necessary, to the lamps, tubes, ballasts, and starters in the lighting
fixtures installed in the Demised Premises, (ii) make all repairs and
replacements, as and when necessary, to Tenant's Personal Property and to any
Alterations made or performed by or on behalf of Tenant or any person claiming
through or under Tenant, and (iii) if the Demised Premises shall include any
space on any ground, street, mezzanine or basement floor in, or facing the
atrium or any public portion of, the Building, make all replacements, as and
when necessary, to all windows and plate and other glass in, on or about such
space, and obtain and maintain, throughout the Demised Term, plate glass
insurance policies issued by companies, and in form and amounts, reasonably
satisfactory to Landlord, in which Landlord, its agents and any lessor under any
ground or underlying lease shall be named as parties insured, and (iv) perform
all maintenance and make all repairs and replacements, as and when necessary, to
any air conditioning equipment, private elevators, escalators, conveyors or
mechanical systems (other than the Building's standard equipment and systems)
which may be installed in the Demised Premises by Landlord, Tenant or others.
The provisions of the foregoing sentence shall not, in and of themselves, be
deemed to give to Tenant any right to install air conditioning equipment,
elevators, escalators, conveyors or mechanical systems. All repairs and
replacements made by or on behalf of Tenant or any person claiming through or
under Tenant shall be made and performed in conformity with, and subject to the
provisions of, Section 4.01 and shall be at least equal in quality and class to
the original work or installation. The necessity for, and adequacy of, repairs
and replacements pursuant to this Article 6 shall be measured by the standard
which is appropriate for first class office buildings of similar construction
and class in the Boston, Massachusetts area. In no event shall Tenant be
obligated to make any repair to the Demised Premises to the extent necessitated
by the acts, omissions or negligence of Landlord or any of Landlord's servants,
employees, contractors or agents. Subject to Tenant's obligations hereunder and
except as otherwise herein provided in the case of damage by fire or other
casualty or as a result of an eminent domain taking, Landlord shall, within a
reasonable time, make all repairs and replacements necessary to maintain in good
condition the roof, exterior walls, floor slabs, foundations and other
structural components of the Building as well as all lavatories, elevators,
sanitary, electrical, heating and air conditioning systems and other common
areas and facilities of the Building serving the Demised Premises. Landlord
shall further be responsible for removing snow and ice from any exterior
passageways on the Property and maintaining any landscaped areas outside the
Building.


                                    ARTICLE 7

                              COMPLIANCE WITH LAWS

      Section 7.01. Tenant, at Tenant's sole cost and expense, shall comply with
all present and future laws, orders and regulations (including, but not limited
to, the Americans with Disabilities Act and the energy conservation provisions
of the Massachusetts Building Code) of Federal, State, County and Municipal
authorities, and with all directions, requirements, orders and notices of
violation thereof, issued by all public officers, which shall impose any duty
upon Landlord or Tenant with respect to the particular manner in which Tenant or
any person claiming through or under Tenant makes use of the Demised Premises,
or arising out of acts, omissions, or negligence of Tenant or any such person or
any of their servants, employees, contractors, agents, visitors or licensees,
whether ordinary or extraordinary, foreseen or unforeseen. Landlord shall be
responsible for such compliance (i) relative to the common areas and facilities
of the Building and (ii) to the extent necessary in order to allow the continued
use of the Demised Premises for general office purposes. Any work or
installations made or performed by or on behalf of Tenant or any person claiming
through or under Tenant pursuant to the provisions of this Article shall be made
in conformity with, and subject to the provisions of, Section 4.01.

      Section 7.02. Tenant shall not do anything, or permit anything to be done,
in or about the Demised Premises which shall (i) invalidate or be in conflict
with the provisions of any fire or other insurance policies covering the
Building or any property located therein, or (ii) result in a refusal by fire
insurance companies of good standing to insure the Building or any such property
in amounts satisfactory to Landlord, or (iii) subject Landlord to any liability
or responsibility for injury to any person or property by reason of any business
operation being conducted in the Demised Premises, or (iv) cause any increase in
the fire insurance rates applicable to the Building or property located therein
at the beginning of the Demised Term or at any time thereafter. Tenant, at
Tenant's expense, shall comply with all present and future rules, orders,
regulations and requirements of the Boston Board of Fire Underwriters and the
New England Fire Insurance Rating Organization or any similar body and the
issuer of any insurance obtained by Landlord covering the Building and/or the
Real Property, whether ordinary or extraordinary, foreseen or unforeseen.

      Section 7.03. In any action or proceeding wherein Landlord and Tenant are
parties, a schedule or "make up" of rates applicable to the Building or property
located therein issued by I.S.O. Commercial Risk Services, Inc., or other
similar body fixing such fire insurance rates, shall be conclusive evidence of
the facts therein stated and of the several items and charges in the fire
insurance rates then applicable to the Building or property located therein.

                                    ARTICLE 8

                         SUBORDINATION, ATTORNMENT, ETC.

      Section 8.01. A. This Lease and all rights of Tenant under this Lease are,
and shall remain, unconditionally subject and subordinate in all respects to (a)
all ground or underlying leases now or hereafter affecting the Real Property or
any portion thereof, including, without limitation, a certain amended and
restated lease (the "Commonwealth Lease"), dated May 6th, 1982, between the
Commonwealth of Massachusetts, as landlord, and Bostrose Associates, L.P., as
tenant, affecting a portion of the Land, and (b) all mortgages which may now or
hereafter affect such leases or the Real Property, including, without
limitation, certain mortgages and security agreements (collectively the
"Mortgage"), between Dewey Square Tower Associates, as mortgagor, and
Metropolitan Life Insurance Company, as mortgagee, and to all advances made or
hereafter to be made under such mortgages, and to all renewals, modifications,
consolidations, correlations, replacements and extensions of, and substitutions
for, such leases and mortgages, and (c) the Urban Renewal Plan - Central
Business District South Station Urban Renewal Area, Project No. Mass. R-82C,
dated May, 1968 and as approved by the City Council on February 24, 1969, a copy
of which is recorded at Suffolk Registry of Deeds in Book 8632, Page 602, as
amended by a Proclaimer of Minor Modification approved by the Boston
Redevelopment Authority (the "Authority") on August 6, 1981, and recorded with
said Deeds on May 4, 1982 as Instrument #163, and (d) a certain Amended and
Restated Land Disposition Agreement (the "Land Disposition Agreement"), dated
May 3rd, 1982, between the Authority, Rose Associates and Bostrose Associates,
L.P. Landlord warrants and represents that none of the instruments hereinabove
specified prohibits the making of this Lease or materially impairs Tenant's
ability to make use of the Demised Premises as herein permitted. The foregoing
provisions of this Section shall be self-operative and no further instrument of
subordination shall be required. In confirmation of such subordination, Tenant
shall execute and deliver promptly any certificate or other instrument which
Landlord, or any lessor under any ground or underlying lease, or any holder of
any such mortgage or the Authority may reasonably request. No act or failure to
act on the part of Landlord which would entitle Tenant under the terms of this
Lease, or by law, to be relieved of Tenant's obligations hereunder (except to
the extent permitted by Section 45.02) or to terminate this Lease (except as
herein provided in the case of damage by fire or other casualty or as a result
of an eminent domain taking) shall result in a release or termination of such
obligations or a termination of this Lease unless (i) Tenant shall have first
given written notice of Landlord's act or failure to act to the holder of the
Mortgage and to the holder or holders of any other mortgage of whom Tenant has
been given written notice specifying the act or failure to act on the part of
Landlord which could or would give basis to Tenant's rights; and (ii) the holder
or holders of such mortgages, after receipt of such notice, have failed or
refused to correct or cure the condition complained of within a reasonable time
thereafter; but nothing contained in this sentence shall be deemed to impose any
obligation on any such holders to correct or cure any such condition.
"Reasonable time" as used above means and includes a reasonable time to obtain
possession of the Building if any such holder elects to do so and a reasonable
time to correct or cure the condition if such condition is determined to exist,
provided that such Mortgagee shall investigate the condition complained of
within thirty (30) days after notice thereof and thereafter pursue any required
corrective action with all due diligence.

      B. Notwithstanding the provisions of subsection A of this Section 8.01,
the holder of any mortgage to which the Lease is subject and subordinate, as
provided in said subsection A, shall have the right, at its sole option, to
subordinate and subject its mortgage, in whole or in part, to this Lease by
recording a unilateral declaration to such effect.

      Section 8.02. If, at any time prior to the expiration of the Demised Term,
any ground or underlying lease under which Landlord then shall be the lessee
shall terminate or be terminated for any reason, Tenant agrees, at the election
and upon demand of any owner of the Real Property, or of the holder of any
mortgage in possession of the Real Property or the Building, or of any lessee
under any other ground or underlying lease covering premises which include the
Demised Premises, to attorn, from time to time, to any such owner, holder, or
lessee, upon the then executory terms and conditions of this Lease, for the
remainder of the term originally demised in this Lease, provided that such
owner, holder or lessee, as the case may be, shall then be entitled to
possession of the Demised Premises. The provisions of this Section shall enure
to the benefit of any such owner, holder, or lessee, shall apply notwithstanding
that, as a matter of law, this Lease may terminate upon the termination of any
such ground or underlying lease, shall be self-operative upon any such demand,
and no further instrument shall be required to give effect to said provisions.
Tenant, however, upon demand of any such owner, holder, or lessee, agrees to
execute, from time to time, instruments in confirmation of the foregoing
provisions of this Section, satisfactory to any such owner, holder, or lessee,
acknowledging such attornment and setting forth the terms and conditions of its
tenancy. Nothing contained in this Section shall be construed to impair any
right otherwise exercisable by any such owner, holder, or lessee.

      Section 8.03. From time to time, within ten (10) days next following
Landlord's request, Tenant shall deliver to Landlord a written statement
executed and acknowledged by Tenant, in form satisfactory to Landlord, (i)
stating that this Lease is then in full force and effect and has not been
modified (or, if modified, setting forth the specific nature of all
modifications), and (ii) setting forth the date to which the Fixed Rent has been
paid, and (iii) stating whether or not, to the best knowledge of Tenant,
Landlord is in default under this Lease, and, if Landlord is in default, setting
forth the specific nature of all such defaults. Tenant acknowledges that any
statement delivered pursuant to this Section may be relied upon by any purchaser
or owner of the Building, or the Real Property or any part thereof, or
Landlord's interest in the Building or the Real Property or any ground or
underlying lease, or by any mortgagee, or by any assignee of any mortgagee, or
by any lessee under any ground or underlying lease.

      Section 8.04. If Landlord assigns its interest in this Lease, or the rents
payable hereunder, to the holder of any mortgage or the lessor of any ground or
underlying lease, whether the assignment shall be conditional in nature or
otherwise, Tenant agrees that (a) the execution thereof by Landlord and the
acceptance by such holder or lessor shall not be deemed an assumption by such
holder or lessor of any of the obligations of the Landlord under this Lease
unless such holder or lessor shall, by written notice sent to Tenant,
specifically otherwise elect; and (b) except as aforesaid, such holder or lessor
shall be treated as having assumed Landlord's obligations hereunder only upon
the foreclosure of such holder's mortgage or the termination of such lessor's
lease and the taking of possession of the Demised Premises by such holder or
lessor, as the case may be.

Section 8.05. The provisions of this Article relating to the subordination of
this Lease to any future mortgage or ground lease and Tenant's attornment to the
mortgagee or lessee thereunder (referred to in this Section as the "holder")
shall be subject to the execution and delivery to Tenant of an agreement, in the
holder's customary form, in which the holder agrees to recognize the provisions
of Tenant hereunder in the event that the holder succeeds to Landlord's interest
in this Lease. Nothing contained herein shall be deemed to affect the prior
rights of the holder with respect to any insurance proceeds or condemnation
awards or to render the holder:

                  (a)  liable for any act or omission of a prior lessor
            (including Landlord);

                  (b)  subject to any offsets or defenses which Tenant may have
            against any prior lessor (including Landlord);

                  (c)  bound by any rent or other sum which Tenant may have
            paid in advance to any prior lessor (including Landlord);

                  (d)  bound by any amendment or other modification of this
            Lease made without the prior consent of the holder;

                  (e) liable for the performance of the Work pursuant to
            Schedule A or, in the event of any casualty or taking more
            particularly described in Articles 10 and 11, for any repairs,
            replacements, rebuilding or restoration except as can reasonably be
            accomplished from the net proceeds of insurance or the net
            condemnation award actually received by or made available to the
            holder; or

                  (f)  liable for the return of any security deposit not
            actually received by the holder.

In addition, Landlord shall arrange to have the holder of the Mortgage join in
the execution and delivery of an agreement in the form attached hereto as
Exhibit C and made a part hereof.


                                    ARTICLE 9

                               PROPERTY LOSS, ETC.

      Section 9.01. Any Building employee to whom any property shall be
entrusted by or on behalf of Tenant shall be deemed to be acting as Tenant's
agent with respect to such property and neither Landlord nor Landlord's agents
shall be liable for any loss of or damage to any such property by theft or
otherwise. Neither (i) the performance by Landlord, Tenant or others of any
decorations, repairs, alterations, additions or improvements in or to the
Building or the Demised Premises, nor (ii) the failure of Landlord or others to
make any such decorations, repairs, alterations, additions or improvements, nor
(iii) any damage to the Demised Premises or to the property of Tenant, nor any
injury to any persons, caused by other tenants or persons in the Building, or by
operations in the construction of any private, public or quasi-public work, or
by any other cause, nor (iv)(subject to Landlord's repair obligations hereunder)
any latent defect in the Building or in the Demised Premises, nor (v) any
closing, darkening or bricking up of any windows of the Demised Premises for any
reason whatsoever (unless closed, darkened or bricked up, other than on a
temporary basis for not more than five (5) consecutive days or such longer
period as may be appropriate in circumstances of the type described in Article
26, by Landlord), nor (vi) any inconvenience or annoyance to Tenant or injury to
or interruption of Tenant's business by reason of any of the events of
occurrences referred to in the foregoing subdivisions (i) through (v), shall
constitute an actual or constructive eviction, in whole or in part, or entitle
Tenant to any abatement or diminution of rent (except as may be otherwise set
forth in Section 45.02), or relieve Tenant from any of its obligations under
this Lease, or impose any liability upon Landlord, or its agents, or any lessor
under any ground or underlying lease, other than such liability as may be
imposed upon Landlord by law for Landlord's negligence or the negligence of
Landlord's agents, servants or employees in the operation or maintenance of the
Building or for the breach by Landlord of any express covenant of this Lease on
Landlord's part to be performed.

                                   ARTICLE 10

                      DESTRUCTION -- FIRE OR OTHER CASUALTY

      Section 10.01. If the Demised Premises shall be damaged by fire or other
casualty, Tenant shall give prompt notice to Landlord of such damage and
Landlord, at Landlord's expense, shall repair such damage. For purposes hereof,
damage to the Demised Premises shall be deemed to include instances wherein the
Demised Premises have been rendered untenantable or inaccessible on account of a
fire or other casualty occurring elsewhere in the Building. However, Landlord
shall have no obligation to repair any damage to, or to replace, Tenant's
Personal Property or any other property or effects of Tenant. If the entire
Demised Premises shall be rendered untenantable by reason of any such damage,
the Fixed Rent shall abate for the period from the date of such damage to the
date when such damage shall have been repaired, and if only a part of the
Demised Premises shall be so rendered untenantable, the Fixed Rent shall abate
for such period in the proportion which the area of the part of the Demised
Premises so rendered untenantable bears to the total area of the Demised
Premises. However, if, prior to the date when all of such damage shall have been
repaired, any part of the Demised Premises so damaged shall be rendered
tenantable and shall be used or occupied by Tenant or any person or persons
claiming through or under Tenant, then the amount by which the Fixed Rent shall
abate shall be equitably apportioned for the period from the date of any such
use or occupancy to the date when all such damage shall have been repaired. The
provisions of this Article 10 shall be considered an express agreement governing
any instance of damage or destruction to the Building or the Demised Premises by
fire or other casualty, and any law now or hereafter in force providing for such
a contingency in the absence of express agreement shall have no application.
Notwithstanding the foregoing provisions of this Section, if, prior to or during
the Demised Term, (i) the Demised Premises shall be totally damaged or rendered
wholly untenantable by fire or other casualty occurring at such time as less
than one (1) year remains in the Demised Term, or (ii) the Building shall be so
damaged by fire or other casualty that, in Landlord's opinion, substantial
alteration, demolition, or reconstruction of the Building shall be required
(whether or not the Demised Premises shall have been damaged or rendered
untenantable), then, in any of such events, Landlord, at Landlord's option, may
give to Tenant, within ninety (90) days after such fire or other casualty, a
thirty (30) days' notice of termination of this Lease and, in the event such
notice is given, this Lease and the Demised Term shall come to an end and expire
(whether or not said term shall have commenced) upon the expiration of said
thirty (30) days with the same effect as if the date of expiration of said
thirty (30) days were the Expiration Date, the Fixed Rent shall be apportioned
as of such date and any prepaid portion of Fixed Rent for any period after such
date shall be refunded by Landlord to Tenant.

      Section 10.02. Landlord shall keep in force casualty insurance with
respect to the Building in an amount approximately equal to the full replacement
cost thereof. Such insurance shall afford protection against fire and the other
perils customarily covered by a so-called "all risk" policy. Landlord shall
obtain and maintain, throughout the Demised Term, in Landlord's fire insurance
policies covering the Building, provisions (so long as the same are commercially
available) to the effect that such policies shall not be invalidated should the
insured waive, in writing, prior to a loss, any or all right of recovery against
any party for loss occurring to the Building. In the event that at any time
Landlord's fire insurance carriers shall exact an additional premium for the
inclusion of such or similar provisions, Landlord shall give Tenant notice
thereof. In such event, if Tenant agrees, in writing, to reimburse Landlord for
such additional premium for the remainder of the Demised Term, Landlord shall
require the inclusion of such or similar provisions by Landlord's fire insurance
carriers. As long as such or similar provisions are included in Landlord's fire
insurance policies then in force, Landlord hereby waives (i) any obligation on
the part of Tenant to make repairs to the Demised Premises necessitated or
occasioned by fire or other casualty that is an insured risk under such
policies, and (ii) any right of recovery against Tenant, any other permitted
occupant of the Demised Premises, and any of their servants, employees, agents
or contractors, for any loss occasioned by fire or other casualty that is an
insured risk under such policies. In the event that at any time Landlord's fire
insurance carriers shall not include such or similar provisions in Landlord's
fire insurance policies, the waivers set forth in the foregoing sentence shall,
upon notice given by Landlord to Tenant, be deemed of no further force or
effect.

      Section 10.03. Except to the extent expressly provided in Section 10.02,
nothing contained in this Lease shall relieve Tenant of any liability to
Landlord or to its insurance carriers which Tenant may have under law or the
provisions of this Lease in connection with any damage to the Demised Premises
or the Building by fire or other casualty.

      Section 10.04. Tenant acknowledges that it has been advised that
Landlord's insurance policies do not cover the Tenant's property in the Demised
Premises; accordingly, it shall be Tenant's obligation to obtain and maintain
insurance covering its property in the Demised Premises. Tenant shall obtain and
maintain, throughout the Demised Term, in Tenant's fire insurance policies
covering Tenant's property in the Demised Premises (and shall cause any other
permitted occupants of the Demised Premises to obtain and maintain, in similar
policies), provisions (so long as the same are commercially available) to the
effect that such policies shall not be invalidated should the insured waive, in
writing, prior to a loss, any or all right of recovery against any party for
loss occasioned by fire or other casualty which is an insured risk under such
policies. In the event that at any time the fire insurance carriers issuing such
policies shall exact an additional premium for the inclusion of such or similar
provisions, Tenant shall give Landlord notice thereof. In such event, if
Landlord agrees, in writing, to reimburse Tenant or any person claiming through
or under Tenant, as the case may be, for such additional premium for the
remainder of the Demised Term, Tenant shall require the inclusion of such or
similar provisions by such fire insurance carriers. As long as such or similar
provisions are included in such fire insurance policies then in force, Tenant
hereby waives (and agrees to cause any other permitted occupants of the Demised
Premises to execute and deliver to Landlord written instruments waiving) any
right of recovery against Landlord, any lessors under any ground or underlying
leases, any other tenants or occupants of the Building, and any servants,
employees, agents or contractors of Landlord or of any such lessor, or of any
such other tenants or occupants, for any loss occasioned by fire or other
casualty which is an insured risk under such policies. In the event that at any
time such fire insurance carriers shall not include such or similar provisions
in any such fire insurance policy, the waiver set forth in the foregoing
sentence shall, upon notice given by Tenant to Landlord, be deemed of no further
force or effect with respect to any insured risks under such policy from and
after the giving of such notice. During any period while the foregoing waiver of
right of recovery is in effect, Tenant, or any other permitted occupant of the
Demised Premises, as the case may be, shall look solely to the proceeds of such
policies to compensate Tenant or such other permitted occupant for any loss
occasioned by fire or other casualty which is an insured risk under such
policies.

      Section 10.05. In the event that Landlord becomes obligated to undertake
any repair or restoration work with respect to the Demised Premises pursuant to
this Article as a consequence of damage by fire or other casualty, Landlord
shall furnish to Tenant as soon as practicable an estimate of the time
reasonably required to substantially complete such work. If (a) no such estimate
is furnished within sixty (60) days following such casualty, or (b) according to
such estimate, such work is not expected to be substantially completed within
twelve (12) months following such casualty, or (c) such work is not in fact
substantially completed within twelve (12) months following such casualty (which
period may be extended for not more than three (3) additional months on account
of delays of the type described in Article 26), or (d) the Demised Premises are
substantially damaged by any such casualty occurring at such time as less than
one (1) year remains in the Demised Term, Tenant may elect to terminate this
Lease by notice given to Landlord within thirty (30) days after the expiration
of said sixty (60) day period, or the furnishing of such estimate, or the
expiration of said twelve (12) month period (extended as aforesaid), or the
occurrence of said substantial casualty damage, as the case may be, whereupon
this Lease and the Demised Term shall come to an end with the same force and
effect as if the date of such notice were the Expiration Date.


                                   ARTICLE 11

                                 EMINENT DOMAIN

      Section 11.01. If the whole of the Demised Premises shall be acquired or
condemned for any public or quasi-public use or purpose, this Lease and the
Demised Term shall end as of the date of the vesting of title with the same
effect as if said date were the Expiration Date. If only a part of the Demised
Premises shall be so acquired or condemned then, except as otherwise provided in
this Section, this Lease and the Demised Term shall continue in force and effect
but, from and after the date of the vesting of title, the Fixed Rent shall be
reduced in the proportion which the area of the part of the Demised Premises so
acquired or condemned bears to the total area of the Demised Premises
immediately prior to such acquisition or condemnation. If only a part of the
Real Property shall be so acquired or condemned, then (i) whether or not the
Demised Premises shall be affected thereby (unless only an insubstantial part of
the Real Property is so acquired or condemned), Landlord, at Landlord's option,
may give to Tenant, within sixty (60) days next following the date upon which
Landlord shall have received notice of vesting of title, a thirty (30) days'
notice of termination of this Lease, and (ii) if the part of the Real Property
so acquired or condemned shall contain more than ten (10%) percent of the total
area of the Demised Premises immediately prior to such acquisition or
condemnation, or if, by reason of such acquisition or condemnation, Tenant no
longer has reasonable means of access to the Demised Premises, Tenant, at
Tenant's option, may give to Landlord, within sixty (60) days next following the
date upon which Tenant shall have received notice of vesting of title, a thirty
(30) days' notice of termination of this Lease. In the event any such thirty
(30) days' notice of termination is given, by Landlord or Tenant, this Lease and
the Demised Term shall come to an end and expire upon the expiration of said
thirty (30) days with the same effect as if the date of expiration of said
thirty (30) days were the Expiration Date. If a part of the Demised Premises
shall be so acquired or condemned and this Lease and the Demised Term shall not
be terminated pursuant to the foregoing provisions of this Section, Landlord, at
Landlord's expense, shall restore that part of the Demised Premises not so
acquired or condemned to a self-contained rental unit. In the event of any
termination of this Lease and the Demised Term pursuant to the provisions of
this Section, the Fixed Rent shall be apportioned as of the date of such
termination and any prepaid portion of Fixed Rent for any period after such date
shall be refunded by Landlord to Tenant.

      Section 11.02. In the event of any such acquisition or condemnation of all
or any part of the Real Property, Landlord shall be entitled to receive the
entire award for any such acquisition or condemnation, Tenant shall have no
claim against Landlord or the condemning authority for the value of any
unexpired portion of the Demised Term and Tenant hereby expressly assigns to
Landlord all of its rights in and to any such award. Nothing contained in this
Section shall be deemed to prevent Tenant from making a claim in any
condemnation proceeding for the value of any items of Tenant's Personal Property
which are compensable, in law, as trade fixtures, or for moving and relocation
damages separately payable to Tenant.


                                   ARTICLE 12

                            ASSIGNMENT AND SUBLETTING

      Section 12.01. Tenant, for itself, its heirs, distributees, executors,
administrators, legal representatives, successors and assigns, covenants that,
without the prior consent of Landlord in each instance, it shall not, subject to
the applicable provisions of Sections 12.03 and 12.04, (i) assign, whether by
consolidation, merger or otherwise, mortgage or encumber its interest in this
Lease, in whole or in part, or (ii) sublet, or permit the subletting of, the
Demised Premises or any part thereof, or (iii) permit the Demised Premises or
any part thereof to be occupied, or used for desk space, mailing privileges or
otherwise, by any person other than Tenant or a parent, subsidiary or affiliate
of Tenant. The sale, pledge, transfer or other alienation of (a) a majority
interest in the issued and outstanding capital stock of any corporate Tenant
(unless such stock is publicly traded on any recognized security exchange or
over-the-counter market), or (b) any controlling interest in any partnership or
joint venture Tenant, however accomplished, and whether in a single transaction
or in a series of related or unrelated transactions (referred to as an "Indirect
Assignment"), shall be deemed, for the purposes of this Section, an assignment
of this Lease.

      Section 12.02. If Tenant's interest in this Lease is assigned, whether or
not in violation of the provisions of this Article, Landlord may collect rent
from the assignee; if the Demised Premises or any part thereof are sublet to, or
occupied by, or used by, any person other than Tenant, whether or not in
violation of this Article, Landlord, after default beyond the applicable grace
period by Tenant under this Lease, may collect rent from the subtenant, user or
occupant. In either case, Landlord shall apply the net amount collected to the
rents reserved in this Lease, but neither any such assignment, subletting,
occupancy, or use, whether with or without Landlord's prior consent, nor any
such collection or application, shall be deemed a waiver of any term, covenant
or condition of this Lease or the acceptance by Landlord of such assignee,
subtenant, occupant or user as Tenant. The consent by Landlord to any
assignment, subletting, occupancy or use shall not relieve Tenant from its
obligation to obtain the express prior consent of Landlord to any further
assignment, subletting, occupancy or use. The listing of any name other than
that of Tenant on any door of the Demised Premises or on any directory or in any
elevator in the Building or otherwise, shall not operate to vest in the person
so named any right or interest in this Lease or in the Demised Premises or the
Building, or be deemed to constitute, or serve as a substitute for, any prior
consent required under this Article, and it is understood that any such listing
shall constitute a privilege extended by Landlord which shall be revocable at
Landlord's will by notice to Tenant. Tenant agrees to pay to Landlord reasonable
counsel fees incurred by Landlord in connection with any proposed assignment of
Tenant's interest in this Lease or any proposed subletting of the Demised
Premises or any part thereof (provided however that such fees shall not exceed
$1,000 in the case of each such transaction). Neither any assignment of Tenant's
interest in this Lease nor any subletting, occupancy or use of the Demised
Premises or any part thereof by any person other than Tenant, nor any collection
of rent by Landlord from any person other than Tenant as provided in this
Section, nor any application of any such rent as provided in this Section,
shall, in any circumstances, relieve Tenant of its obligation fully to observe
and perform the terms, covenants and conditions of this Lease on Tenant's part
to be observed and performed.

      Section 12.03. As long as Tenant is not in default beyond the applicable
grace period under any of the terms, covenants or conditions of this Lease on
Tenant's part to be observed or performed, Landlord agrees not unreasonably to
withhold Landlord's prior consent to sublettings by Tenant of all or parts of
the Demised Premises, it being specifically understood and agreed that Landlord
may withhold such consent if, in Landlord's reasonable judgment, the occupancy
of the proposed subtenant will tend to impair the character or dignity of the
Building or impose any additional burden upon Landlord in the operation of the
Building. Tenant acknowledges that it has been advised that the consent of the
holder of the Mortgage is required for any such subletting, and Tenant agrees
that Landlord shall have no obligation to consent to any subletting if the
holder of such Mortgage refuses to consent thereto (provided however that
Landlord shall use diligent efforts to obtain such consent whenever Landlord is
prepared to grant its own consent as aforesaid). Each such subletting shall be
for undivided occupancy by the subtenant of that part of the Demised Premises
affected thereby, for the use permitted in this Lease, and at no time shall
there be more than five (5) occupants, including Tenant, on any one floor.
Neither such subtenant nor its heirs, distributees, executors, administrators,
legal representatives, successors or assigns, without the prior consent of
Landlord and the holder of the Mortgage shall (i) assign, whether by merger,
consolidation or otherwise, mortgage or encumber its interest in any sublease,
in whole or in part, or (ii) sublet, or permit the subletting of, that part of
the Demised Premises affected by such subletting or any part thereof, or (iii)
permit such part of the Demised Premises affected by such subletting or any part
thereof to be occupied or used for desk space, mailing privileges or otherwise,
by any person other than such subtenant. The sale, pledge, transfer or other
alienation of (a) a majority interest in the issued and outstanding capital
stock of any corporate subtenant (unless such stock is publicly traded on any
recognized security exchange or over-the-counter market) or (b) any controlling
interest in any partnership or joint venture subtenant, however accomplished,
and whether in a single transaction or in a series of related or unrelated
transactions, shall be deemed, for the purposes of this Section, an assignment
of such sublease. Without Landlord's prior consent, Tenant shall not (a)
negotiate or enter into a proposed subletting with any tenant, subtenant or
occupant of any space in the Building other than an Eligible Subtenant (as
hereinafter defined), or (b) list or otherwise publicly advertise the Demised
Premises or any part thereof for subletting at a rental rate lower than the
rental rate at which Landlord is then offering to rent comparable space in the
Building (provided however that the preceding clause (b) shall not be deemed to
prohibit such subletting at such lower rental rate without public disclosure
thereof). For purposes hereof, an "Eligible Subtenant" shall be a tenant,
subtenant or occupant occupying space in the Building at such time as Landlord
is not able to deliver to such tenant, subtenant or occupant, for a period
beginning on or before or within six (6) months after the date on which the term
of the proposed subletting would commence and continuing through the date on
which said term would end, space elsewhere in the Building comparable in size to
the proposed sublet area. Landlord shall, whenever requested in writing by
Tenant with respect to a prospective subletting, advise Tenant as to whether the
proposed subtenant is an Eligible Subtenant. Said proposed subtenant shall be
deemed an Eligible Subtenant unless Landlord notifies Tenant to the contrary
within fourteen (14) days after receipt of such request so long as such request
expressly and conspicuously recites the effect of Landlord's failure to respond
thereto as aforesaid. Prior to any proposed subletting, Tenant shall submit to
Landlord a statement containing the name and address of the proposed subtenant
and all of the principal terms and conditions of the proposed subletting
including, but not limited to, the proposed commencement and expiration dates of
the term thereof. Unless the proposed sublet area shall constitute an entire
floor or floors, such statement shall be accompanied by a floor plan delineating
the proposed sublet area. In the event of any dispute between Landlord and
Tenant as to the reasonableness of Landlord's failure or refusal to consent to
any subletting, such dispute shall be submitted to arbitration, in accordance
with the provisions of Article 33. Landlord shall be deemed to have granted its
consent to the proposed subletting unless Landlord notifies Tenant to the
contrary within the Review Period (as such term is hereinafter defined)
commencing upon receipt of such statement so long as such statement expressly
and conspicuously recites the effect of Landlord's failure to respond thereto as
aforesaid. For purposes hereof, the "Review Period" shall be fourteen (14) days
if the proposed sublet area consists of all or some portion of a particular
floor of the Building, and twenty-one (21) days in all other cases. Landlord and
Tenant agree that, to the extent hereinafter set forth, (xx) any increase in the
rental value of the Demised Premises over and above the Fixed Rent payable
pursuant to the provisions of this Lease, as such Fixed Rent may be increased
from time to time pursuant to the provisions of this Lease, and (yy) any
consideration paid to Tenant or any subtenant or other person claiming through
or under Tenant in connection with an assignment of Tenant's interest in this
Lease or the interest of any subtenant or other person claiming through or under
Tenant under any sublease, whether or not such assignment shall be effected with
court approval in a proceeding of the types described in subsection 17.01(c) or
(d), or in any similar proceeding, or otherwise, shall accrue to the benefit of
Landlord and not to the benefit of Tenant, or of any subtenant or other person
claiming through or under Tenant, or of the creditors of Tenant or of any such
subtenant or other person claiming through or under Tenant. Accordingly, it is
agreed that Tenant shall pay to Landlord, as and when received, a sum equal to
50% of any Subletting Profit, as such term is hereinafter defined. All rentals
and other sums paid by any subtenant to Tenant or to any subtenant or other
person claiming through or under Tenant in connection with (i) any subletting of
the entire Demised Premises in excess of the Fixed Rent then payable by Tenant
to Landlord under this Lease, or (ii) any subletting of a portion of the Demised
Premises in excess of that proportion of the Fixed Rent payable by Tenant to
Landlord under this Lease which the area of the portion of the Demised Premises
so sublet bears to the total area of the Demised Premises, are referred to, in
the aggregate, as "Subletting Profit"; in computing any Subletting Profit with
respect to any period of time, there shall first be deducted any out-of-pocket
costs (including brokerage commissions, attorneys' fees and the cost of
preparing the sublet area for occupancy) reasonably incurred by Tenant or any
such subtenant or other person claiming through or under Tenant in connection
with such subletting. Landlord and Tenant agree that if Tenant, or any subtenant
or other person claiming through or under Tenant, shall assign or have assigned
its interest as Tenant under this Lease or its interest as subtenant under any
sublease, as the case may be, whether or not such assignment, shall be effected
with court approval in a proceeding of the types described in subsections
17.01(c) or (d), or in any similar proceeding, or otherwise, Tenant shall pay to
Landlord a sum equal to 50% of any consideration paid to Tenant or any subtenant
or other person claiming through or under Tenant for such assignment, less any
out-of-pocket costs (including brokerage commissions, attorneys' fees and the
cost of improvements made on behalf of the assignee) reasonably incurred by such
payee in connection with such assignment. All sums payable hereunder by Tenant
shall be paid to Landlord as additional rent immediately upon such sums being
paid to Tenant or to any subtenant or other person claiming through or under
Tenant and, if requested by Landlord, Tenant shall promptly enter into a written
agreement with Landlord setting forth the amount of such sums to be paid to
Landlord; however, neither Landlord's failure to request the execution of such
agreement nor Tenant's failure to execute such agreement shall vitiate the
provisions of this Section. Neither Landlord's consent to any subletting nor
anything contained in this Section shall be deemed to grant to any subtenant or
other person claiming through or under Tenant the right to sublet all or any
portion of the Demised Premises or to permit the occupancy of all or any portion
of the Demised Premises by others.

      Section 12.04. Notwithstanding any other provision of this Article to the
contrary, Tenant may, following notice to Landlord but without the requirement
of obtaining Landlord's consent, and provided Tenant shall not then be in
default beyond the applicable grace period in the observance or performance of
any term, covenant or condition of this Lease on Tenant's part to be performed
or observed, assign this Lease or sublet the Demised Premises to any entity
which is a parent, subsidiary or affiliate of Tenant or assign this Lease to any
entity with which Tenant may merge or consolidate or to which Tenant may sell
all or substantially all of its assets as a going concern (such entity with
which Tenant may merge or consolidate or to which Tenant may sell all or
substantially all of its assets as aforesaid being hereinafter referred to as a
"Successor"), provided however that, forthwith upon any assignment allowed
pursuant to this Section (including an Indirect Assignment), Tenant shall
deliver to Landlord an agreement in form and substance reasonably satisfactory
to Landlord which contains an appropriate covenant of assumption by such
assignee, and provided further that in the case of any such assignment to a
Successor, such Successor shall, following such assignment, have financial
resources and a general business reputation comparable to those of Tenant as of
the time of such assignment.


                                   ARTICLE 13

                         RENOVATION OF PRIMARY PREMISES

      Section 13.01. Tenant proposes to undertake certain renovations within the
Primary Premises in accordance with Article 4 and all other applicable
provisions of this Lease. In consideration thereof and as a contribution toward
the cost of such work, Landlord shall provide a credit in the amount of $532,536
to be applied against installments of Fixed Rent becoming due hereunder on and
after February 1, 1997. Tenant shall engage the services of Rose Associates of
Massachusetts, Inc. (or such other entity as Landlord may designate) to manage
such work pursuant to the provisions of a Construction Management Agreement
substantially in the form of Exhibit D attached hereto and made a part hereof.
Said manager shall be compensated for its services under said Agreement by
payment of a fee equal to three percent (3%) of the cost of such work.

                                   ARTICLE 14

                           ACCESS TO DEMISED PREMISES

      Section 14.01. Subject to the applicable provisions of this Article,
Landlord and its agents shall have the following rights in and about the Demised
Premises after (except in case of emergency) prior oral or written notice and
affording Tenant an opportunity to have one or more of its employees present:
(i) to enter into the Demised Premises at all reasonable times to examine the
Demised Premises or for any of the purposes set forth in this Article or for the
purpose of performing any obligation of Landlord under this Lease or exercising
any right or remedy reserved to Landlord in this Lease, and if Tenant, its
officers, partners, agents or employees shall not be personally present or shall
not open and permit an entry into the Demised Premises at any time when such
entry shall be necessary or permissible, to use a master key to enter the
Demised Premises; (ii) to erect, install, use and maintain pipes, ducts and
conduits (concealed, where practicable, above the finished ceiling, behind
finished walls or beneath the finished floor) in and through the Demised
Premises without diminishing (except to a de minimis extent) the usable area
thereof; (iii) to exhibit the Demised Premises to others (including prospective
tenants, but only during the final twelve (12) months of the Demised Term); (iv)
to make such decorations, repairs, alterations, improvements or additions, or to
perform such maintenance, including, but not limited to, the maintenance of all
heating, air conditioning, elevator, plumbing, electrical and other mechanical
facilities, as Landlord may reasonably deem necessary or desirable; and (v) to
take all materials into and upon the Demised Premises that may be required in
connection with any such decorations, repairs, alterations, improvements,
additions or maintenance. The holders of any mortgages affecting the Building or
the Real Property shall have the right (subject to the same provisions hereof
governing access by Landlord) to enter the Demised Premises from time to time
through their respective employees, agents, representatives and architects to
inspect the same or to cure any default of Landlord or Tenant relating thereto.
The landlord under the Commonwealth Lease and representatives of the Federal
Highway Administration ("FHWA") shall have the right to enter the Demised
Premises to inspect the same or for the purpose of enabling the Department of
Public Works of the Commonwealth of Massachusetts, together with representatives
of the FHWA to perform any activities necessary for the construction,
maintenance, repair, inspection, security, observation, removal or like
operations with respect to any such landlord's facilities within the Non-Leased
Premises, as defined in the Commonwealth Lease. The Authority, the City of
Boston and the United States of America shall also have the right to enter the
Demised Premises from time to time to inspect the same. Landlord shall have the
right, from time to time, to change the name, number or designation by which the
Building is commonly known, which right shall include, without limitation, the
right to name the Building after any tenant. Notwithstanding the foregoing and
provided that Tenant is conducting its permitted business activities in portions
of the Demised Premises having an aggregate rentable area (determined in
accordance with Landlord's standard method of measurement) of not less than
100,000 square feet, Landlord shall not, without the prior written consent of
Tenant, include as part of the name of the Building the name of any of the
following firms (unless a particular such firm, or an entity which is a parent,
subsidiary or affiliate thereof, holds an ownership interest in the Real
Property):

                  Fidelity Investments
                  Putman Investments
                  Pioneer Fund
                  Scudder, Stevens & Clark
                  Mutual Funds Service Company
                  State Street Research & Management Company
                  Charles Schwab & Co.
                  Keystone Investments
                  Eaton Vance Funds


      Section 14.02. All parts (except surfaces facing the interior of the
Demised Premises) of all walls, windows and doors bounding the Demised Premises
(including exterior Building walls, core corridor walls, doors and entrances),
all balconies, terraces and roofs adjacent to the Demised Premises, all space in
or adjacent to the Demised Premises used for shafts, stacks, stairways, chutes,
pipes, conduits, ducts, fan rooms, heating, air conditioning, plumbing,
electrical, telecommunication and other mechanical facilities and closets,
service closets and other Building facilities, and the use thereof, as well as
access thereto through the Demised Premises (subject to the provisions of
Section 14.01) for the purposes of operation, maintenance, alteration and
repair, are hereby reserved to Landlord. Landlord also reserves the right at any
time to change the arrangement or location of entrances, passageways, doors,
doorways, corridors, elevators, stairs, toilets and other public parts of the
Building, provided any such change does not unreasonably impede Tenant's access
to the Demised Premises or the common areas appurtenant thereto. Nothing
contained in this Article shall impose any obligation upon Landlord with respect
to the operation, maintenance, alteration or repair of the Demised Premises or
the Building.

      Section 14.03. Landlord and its agents shall have the right to permit
access to the Demised Premises, whether or not Tenant shall be present, to any
sheriff, marshal or court officer or any representative of the fire, police,
building, sanitation or other department of the City, County, State or Federal
Governments entitled to, or reasonably purporting (based upon a display of
identification) to be entitled to, such access for the purpose of taking
possession of, or removing, any property of Tenant or any other occupant of the
Demised Premises, or for any other lawful purpose. Neither anything contained in
this Section, nor any action taken by Landlord under this Section, shall be
deemed to constitute recognition by Landlord that any person other than Tenant
has any right or interest in this Lease or the Demised Premises. Landlord shall
endeavor to give Tenant oral or written notice of any access to the Demised
Premises under this Section unless prohibited from doing so by the person making
such demand.

      Section 14.04. The exercise by Landlord or its agents, or by the holder of
any mortgage affecting the Building or the Real Property, or by the Commonwealth
of Massachusetts or its Department of Public Works, or by the FHWA or the
Authority, of any right reserved in this Article shall not constitute an actual
or constructive eviction, in whole or in part, or entitle Tenant to any
abatement or diminution of rent (except as may be otherwise set forth in Section
45.02), or relieve Tenant from any of its obligations under this Lease, or
impose any liability upon Landlord, or its agents, or upon any lessor under any
ground or underlying lease, or upon the holder of any such mortgage, the FHWA or
the Authority, by reason of inconvenience or annoyance to Tenant, or injury to
or interruption of Tenant's business, or otherwise. Whenever exercising any
right reserved in this Article, Landlord shall use reasonable efforts to
minimize any interference with the conduct of Tenant's business, provided
however that Landlord shall not be obligated to employ labor at so-called
"overtime" or other premium pay rates unless (except in case of emergency)
Tenant would otherwise be able to conduct none of its permitted business
activities in any particular portion of the Demised Premises having a rentable
area (determined in accordance with Landlord's standard method of measurement)
of at least 11,924 square feet on account of the disruptive nature of any work
which Landlord proposes to perform therein.


                                   ARTICLE 15

                                   VAULT SPACE

      Section 15.01. The Demised Premises do not contain any vaults, vault space
or other space outside the boundaries of the Real Property.


                                   ARTICLE 16

                            CERTIFICATE OF OCCUPANCY

      Section 16.01. Tenant will not at any time use or occupy, or permit the
use or occupancy of, the Demised Premises in violation of any Certificate of
Occupancy covering the Demised Premises. Landlord warrants and represents that
the use of the Demised Premises for general office purposes is presently
permitted by applicable law.


                                   ARTICLE 17

                                     DEFAULT

      Section 17.01. Upon the occurrence, at any time prior to or during the
Demised Term, of any one or more of the following events (referred to as "Events
of Default"):

            (a) if Tenant shall default in the payment when due of any
      installment of Fixed Rent or in the payment when due of any additional
      rent and Tenant shall fail to remedy such default within ten (10) days
      after notice by Landlord to Tenant of such default; or

            (b) if Tenant shall default in the observance or performance of any
      term, covenant or condition of this Lease on Tenant's part to be observed
      or performed (other than the covenants for the payment of Fixed Rent and
      additional rent) and Tenant shall fail to remedy such default within
      thirty (30) days after notice by Landlord to Tenant of such default, or if
      such default is of such a nature that it cannot be completely remedied
      within said period of thirty (30) days and Tenant shall not commence
      within said period of thirty (30) days, or shall not thereafter diligently
      prosecute to completion, all steps necessary to remedy such default; or

            (c) if Tenant shall file a voluntary petition in bankruptcy or
      insolvency, or shall be adjudicated a bankrupt or insolvent, or shall file
      any petition or answer seeking any reorganization, arrangement,
      composition, readjustment, liquidation, dissolution or similar relief
      under the present or any future federal bankruptcy act or any other
      present or future applicable federal, state or other statute or law, or
      shall make an assignment for the benefit of creditors or shall seek or
      consent or to acquiesce in the appointment of any trustee, receiver or
      liquidator of Tenant or of all or any part of Tenant's property; or

            (d) if, within ninety (90) days after the commencement of any
      proceeding against Tenant, whether by the filing of a petition or
      otherwise, seeking any reorganization, arrangement, composition,
      readjustment, liquidation, dissolution or similar relief under the present
      or any future federal bankruptcy act or any other present or future
      applicable federal, state or other statute or law, such proceeding shall
      not have been dismissed, or if, within ninety (90) days after the
      appointment of any trustee, receiver or liquidator of Tenant, or of all or
      any part of Tenant's property, without the consent or acquiescence of
      Tenant, such appointment shall not have been vacated or otherwise
      discharged, or if any execution or attachment shall be issued against
      Tenant or any of Tenant's property pursuant to which the Demised Premises
      shall be taken or occupied or attempted to be taken or occupied; or
            (e) if Tenant's interest in this Lease shall devolve upon or pass to
      any person, whether by operation of law or otherwise, except as expressly
      permitted under Article 12,

then, upon the occurrence, at any time prior to or during the Demised Term, of
any one or more such Events of Default, Landlord, at any time thereafter, at
Landlord's option, may give to Tenant a five (5) days' notice of termination of
this Lease and, in the event such notice is given, this Lease and the Demised
Term shall come to an end and expire (whether or not said term shall have
commenced) upon the expiration of said five (5) days with the same effect as if
the date of expiration of said five (5) days were the Expiration Date, but
Tenant shall remain liable for damages and all other sums payable pursuant to
the provisions of Article 19.

      Section 17.02. If, at any time, (i) Tenant shall be comprised of two (2)
or more persons, or (ii) Tenant's obligations under this Lease shall have been
guaranteed by any person other than Tenant, or (iii) Tenant's interest in this
Lease shall have been assigned, the word "Tenant", as used in subsections
17.01(c) and (d), shall be deemed to mean any one or more of the persons
primarily or secondarily liable for Tenant's obligations under this Lease. Any
monies received by Landlord from or on behalf of Tenant during the pendency of
any proceeding of the types referred to in said subsections 17.01(c) and (d)
shall be deemed paid as compensation for the use and occupation of the Demised
Premises and the acceptance of any such compensation by Landlord shall not be
deemed an acceptance of rent or a waiver on the part of Landlord of any rights
under Section 17.01.


                                   ARTICLE 18

                                    REMEDIES

      Section 18.01. If this Lease and the Demised Term shall expire and come to
an end as provided in Article 17:

            (a) Landlord and its agents and servants may at any time after the
      date upon which this Lease and the Demised Term shall expire and come to
      an end, re-enter the Demised Premises or any part thereof, without notice,
      either by summary proceedings or by any other applicable legal action or
      proceeding or otherwise (without being liable to indictment, prosecution
      or damages therefor), and may repossess the Demised Premises and
      dispossess Tenant and any other persons from the Demised Premises and
      remove any and all of their property and effects from the Demised
      Premises; and

            (b) Landlord, at Landlord's option, may relet the whole or any part
      or parts of the Demised Premises from time to time, either in the name of
      Landlord or otherwise, to such tenant or tenants, for such term or terms
      ending before, on or after the Expiration Date, at such rental or rentals
      and upon such other conditions, which may include concessions and free
      rent periods, as Landlord, in its reasonable discretion, may determine.
      Landlord shall have no obligation to relet the Demised Premises or any
      part thereof and shall in no event be liable for refusal or failure to
      relet the Demised Premises or any part thereof, or, in the event of any
      such reletting, for refusal or failure to collect any rent due upon any
      such reletting, and no such refusal or failure shall operate to relieve
      Tenant of any liability under this Lease or otherwise to affect any such
      liability so long as Landlord endeavors in good faith to mitigate damages
      payable by Tenant pursuant to subsection (b) of Section 19.01; Landlord,
      at Landlord's option, may make such repairs, replacements, alterations,
      additions, improvements, decorations and other physical changes in and to
      the Demised Premises as Landlord, in its reasonable discretion, considers
      advisable or necessary in connection with any such reletting or proposed
      reletting, without relieving Tenant of any liability under this Lease or
      otherwise affecting any such liability.

      Section 18.02. Tenant, on its own and on behalf of all persons claiming
through or under Tenant, including all creditors, does hereby waive any and all
rights which Tenant and all such persons might otherwise have under any present
or future law to redeem the Demised Premises, or to re-enter or repossess the
Demised Premises, or to restore the operation of this Lease, after (i) Tenant
shall have been dispossessed by a judgment or by warrant of any court or judge,
or (ii) any re-entry by Landlord, or (iii) any expiration or termination of this
Lease and the Demised Term, whether such dispossession, re-entry, expiration or
termination shall be by operation of law or pursuant to the provisions of this
Lease. The words "re-enter", "re-entry" and "re-entered" as used in this Lease
shall not be deemed to be restricted to their technical legal meanings. In the
event of a breach or threatened breach by Tenant, or any persons claiming
through or under Tenant, of any term, covenant or condition of this Lease on
Tenant's part to be observed or performed, Landlord shall have the right to
enjoin such breach and the right to invoke any other remedy allowed by law or in
equity as if re-entry, summary proceedings and other special remedies were not
provided in this Lease for such breach. The right to invoke the remedies
hereinbefore set forth are cumulative and shall not preclude Landlord from
invoking any other remedy allowed at law or in equity.


                                   ARTICLE 19

                                     DAMAGES

      Section 19.01. If this Lease and the Demised Term shall expire and come to
an end as provided in Article 17, or by or under any summary proceeding or any
other action or proceeding, or if Landlord shall re-enter the Demised Premises
as provided in Article 18, or by or under any summary proceeding or any other
action or proceeding, then, in any of said events:

            (a) Tenant shall pay to Landlord all Fixed Rent, additional rent and
      other charges payable under this Lease by Tenant to Landlord to the date
      upon which this Lease and the Demised Term shall have expired and come to
      an end or to the date of re-entry upon the Demised Premises by Landlord,
      as the case may be; and

            (b) Tenant shall also be liable for and shall pay to Landlord, as
      damages, any deficiency (referred to as "Deficiency") between the Fixed
      Rent reserved in this Lease for the period which otherwise would have
      constituted the unexpired portion of the Demised Term and the net amount,
      if any, of rents collected under any reletting effected pursuant to the
      provisions of Section 18.01 for any part of such period (first deducting
      from the rents collected under any such reletting all of Landlord's
      reasonable expenses in connection with the termination of this Lease or
      Landlord's re-entry upon the Demised Premises and with such reletting
      including, but not limited to, all reasonable repossession costs,
      brokerage commissions, legal expenses, attorneys' fees, alteration costs
      and other reasonable expenses of preparing the Demised Premises for such
      reletting, provided however that any such reletting expenses shall for
      purposes hereof be amortized on a straight line basis over the term of the
      applicable lease and Tenant shall not be responsible for any portion of
      such expenses properly allocable to the period after the date on which the
      Expiration Date had been scheduled to occur). Any such Deficiency shall be
      paid in monthly installments by Tenant on the days specified in this Lease
      for payment of installments of Fixed Rent. Landlord shall be entitled to
      recover from Tenant each monthly Deficiency as the same shall arise, and
      no suit to collect the amount of the Deficiency for any month shall
      prejudice Landlord's right to collect the Deficiency for any subsequent
      month by a similar proceeding (solely for the purposes of this subsection
      (b), the term "Fixed Rent" shall mean the Fixed Rent in effect immediately
      prior to the date upon which this Lease and the Demised Term shall have
      come to an end, or the date of re-entry upon the Demised Premises by
      Landlord, as the case may be, adjusted, from time to time, to reflect any
      increases which would have been payable pursuant to Article 23 if this
      Lease and the term hereof had not been terminated); and

            (c) At any time after the Demised Term shall have expired and come
      to an end or Landlord shall have re-entered upon the Demised Premises, as
      the case may be, whether or not Landlord shall have collected any monthly
      Deficiencies as aforesaid, Landlord shall be entitled to recover from
      Tenant, and Tenant shall pay to Landlord, on demand, as and for liquidated
      and agreed final damages, a sum equal to the amount by which the Fixed
      Rent reserved in this Lease for the period which otherwise would have
      constituted the unexpired portion of the Demised Term exceeds the then
      fair and reasonable rental value of the Demised Premises for the same
      period, both reasonably discounted to present worth. Solely for the
      purposes of this subsection (c), the term "Fixed Rent" shall mean the
      Fixed Rent in effect immediately prior to the date upon which this Lease
      and the Demised Term shall have expired and come to an end, or the date of
      re-entry upon the Demised Premises by Landlord, as the case may be,
      adjusted to reflect any increases pursuant to the provisions of Article 23
      for the Escalation Year immediately preceding such event.

      Section 19.02. If the Demised Premises, or any part thereof, shall be
relet together with other space in the Building, the rents collected or reserved
under any such reletting and the expenses of any such reletting shall be
equitably apportioned for the purposes of this Article 19. Tenant shall in no
event be entitled to any rents collected or payable under any reletting, whether
or not such rents shall exceed the Fixed Rent reserved in this Lease. Nothing
contained in Articles 17, 18 or this Article shall be deemed to limit or
preclude the recovery by Landlord from Tenant of the maximum amount allowed to
be obtained as damages by any statute or rule of law, or of any sums or damages
to which Landlord may be entitled in addition to the damages set forth in
Section 19.01.


                                   ARTICLE 20

                          FEES AND EXPENSES; INDEMNITY

      Section 20.01. Upon the occurrence of an Event of Default (or sooner in
case of emergency), Landlord may, for Tenant's account and at Tenant's
reasonable expense, remedy any failure by Tenant to observe or perform any term,
covenant or condition of this Lease on Tenant's part to be observed or performed
without thereby waiving any other rights or remedies of Landlord with respect to
such failure.

      Section 20.02. Tenant agrees to indemnify and save Landlord harmless of
and from all loss, cost, liability, damage and expense including, but not
limited to, reasonable counsel fees, penalties and fines, incurred in connection
with or arising from (i) any default by Tenant in the observance or performance
of any of the terms, covenants or conditions of this Lease on Tenant's part to
be observed or performed (other than an Event of Default, as to which the other
applicable provisions of this Lease shall govern) or (ii) the breach or failure
of any representation or warranty made by Tenant in this Lease, or (iii) the use
or occupancy or manner of use or occupancy of the Demised Premises by Tenant or
any person claiming through or under Tenant, or (iv) any acts, omissions or
negligence of Tenant or any such person, or the contractors, agents, servants,
employees, visitors or licensees of Tenant or any such person, in or about the
Demised Premises or the Building either prior to, during, or (until Tenant has
quit and surrendered the Demised Premises to Landlord in accordance with the
provisions of Article 21) after the expiration of, the Demised Term including,
but not limited to, any acts, omissions or negligence in the making or
performing of any Alterations. Tenant further agrees to indemnify and save
harmless Landlord, Landlord's agents, and the lessor or lessors under all ground
or underlying leases, of and from all loss, cost, liability, damage and expense
including, but not limited to, reasonable counsel fees, incurred in connection
with or arising from any claims by any persons by reason of injury to persons or
damage to property to the extent occasioned by any use, occupancy, act, omission
or negligence referred to in the preceding sentence. If any action or proceeding
shall be brought against Landlord or Landlord's agents, or the lessor or lessors
under any ground or underlying lease, based upon any such claim and if Tenant,
upon notice from Landlord, shall cause such action or proceeding to be defended
at Tenant's expense by counsel acting for Tenant's insurance carriers in
connection with such defense or by other counsel reasonably satisfactory to
Landlord, without any disclaimer of liability by Tenant or such insurance
carriers in connection with such claim, Tenant shall not be required to
indemnify Landlord, Landlord's agents, or any such lessor for counsel fees in
connection with such action or proceeding. Tenant shall maintain comprehensive
public liability insurance against any claims by reason of personal injury,
death and property damage occurring in or about the Demised Premises covering,
without limitation, the operation of any private air conditioning equipment and
any private elevators, escalators or conveyors in or serving the Demised
Premises or any part thereof, whether installed by Landlord, Tenant, or others,
and shall furnish to Landlord duplicate original policies or certificates of
such insurance at least ten (10) days prior to the Commencement Date and at
least ten (10) days prior to the expiration of the term of any such policy
previously furnished by Tenant, in which policies Landlord, its agents and any
lessor under any ground or underlying lease shall be named as additional parties
insured, which policies shall be issued by companies, and shall be in form
reasonably satisfactory to Landlord. The amount of coverage afforded under such
policies shall be not less than $100,000 for property damage and not less than
$2,000,000 for personal injury to or death of one or more persons in a single
occurrence, or such higher limits as may from time to time be reasonably
required by Landlord and are customarily carried by responsible office tenants
in the greater Boston, Massachusetts area. Any insurance which Tenant is
obligated to maintain hereunder may be carried under any combination of
so-called "blanket" and/or "umbrella" policies so long as the coverage
applicable to the Demised Premises is separately stated therein. Landlord shall
keep in force liability insurance for its own benefit without any obligation to
include Tenant as a named or additional insured party and without in any way
limiting Tenant's obligations hereunder. The amount of coverage afforded by such
insurance shall be not less than $100,000 for property damage and not less than
$2,000,000 for personal injury to or death of one or more persons in a single
occurrence. Any insurance maintained by Tenant pursuant to this Section shall be
primary and non-contributing with respect to any insurance carried by Landlord.

      Section 20.03. Tenant shall pay to Landlord, within thirty (30) days next
following rendition by Landlord to Tenant of bills or statements therefor: (i)
sums equal to all expenditures reasonably made and monetary obligations
reasonably incurred by Landlord including, but not limited to, reasonable
counsel fees, pursuant to the provisions of Section 20.01; (ii) sums equal to
all losses, costs, liabilities, damages and expenses referred to in Section
20.02; (iii) sums equal to all expenditures reasonably made and monetary
obligations reasonably incurred by Landlord including, but not limited to,
reasonable counsel fees, in collecting or attempting to collect the Fixed Rent,
any additional rent or any other sum of money accruing under this Lease or in
enforcing or attempting to enforce any rights of Landlord under this Lease or
pursuant to law, whether by the institution and prosecution of summary
proceedings or otherwise; and (iv) all other sums of money (other than Fixed
Rent) accruing from Tenant to Landlord under the provisions of this Lease. Any
sum of money (other than Fixed Rent) accruing from Tenant to Landlord pursuant
to any provision of this Lease including, but not limited to, the provisions of
Schedule A, whether prior to or after the Commencement Date, may, at Landlord's
option, be deemed additional rent, and Landlord shall have the same remedies for
Tenant's failure to pay any item of additional rent when due as for Tenant's
failure to pay any installment of Fixed Rent when due. Tenant's obligations
under this Article shall survive the expiration or sooner termination of the
Demised Term.

      Section 20.04. If Tenant shall fail to make payment of any installment of
Fixed Rent or any additional rent within ten (10) days after the date when such
payment is due (so long as Tenant shall have received notice of such obligation
in the form of a bill or other invoice) Tenant shall pay to Landlord, in
addition to such installment of Fixed Rent or such additional rent, as the case
may be, as a late charge and as additional rent, a sum equal to two (2%) percent
per annum above the then current Prime Rate, as defined in Article 2, of the
amount unpaid computed from the date such payment was due to and including the
date of payment, provided however that such late charge shall be waived if no
such failure has occurred on any prior occasion during the preceding three (3)
year period.

      Section 20.05. Landlord shall pay to Tenant, within thirty (30) days next
following rendition by Tenant to Landlord of bills and statements therefor
together with reasonably satisfactory supporting documentation, any reasonable
counsel fees and court costs incurred by Tenant in enforcing or attempting to
enforce any rights of any Tenant under this Lease or pursuant to law on account
of any default by Landlord hereunder.


                                   ARTICLE 21

                                   END OF TERM

      Section 21.01. On the date upon which the Demised Term shall expire and
come to an end, whether pursuant to any of the provisions of this Lease or by
operation of law, and whether on or prior to the Expiration Date, Tenant, at
Tenant's sole cost and expense, (i) shall quit and surrender the Demised
Premises to Landlord, broom clean and in good order and condition except for
ordinary wear and tear, damage by fire or other casualty for which Tenant is not
otherwise liable and damage caused by the acquisition or condemnation of all or
any part of the Demised Premises for any public or quasi-public use or purpose,
and (ii) shall remove all of Tenant's Personal Property and all other property
and effects of Tenant and all persons claiming through or under Tenant from the
Demised Premises and the Building, and (iii) shall repair all damage to the
Demised Premises occasioned by such removal. Notwithstanding the foregoing,
Tenant shall not be required to so remove any wires or cables concealed above
the finished ceiling, behind finished walls or beneath the finished floor so
long as such wiring or cabling is suitably capped. Landlord shall have the right
to retain any property and effects which shall remain in the Demised Premises
after the expiration or sooner termination of the Demised Term (so long as
Tenant has otherwise relinquished possession of the Demised Premises), and any
net proceeds from the sale thereof, without waiving Landlord's rights with
respect to any default by Tenant under the foregoing provisions of this Section.
To the extent legally permissible, Tenant expressly waives, for itself and for
any person claiming through or under Tenant, any rights which Tenant or any such
person may have under the provisions of any present or future law then in force,
to apply for or obtain any stay or extension of its right to remain in
possession of the Demised Premises or any part thereof in connection with any
holdover summary proceeding or any other action or proceeding which Landlord may
institute to enforce the foregoing provisions of this Article. If said date upon
which the Demised Term shall expire and come to an end shall fall on a Sunday or
holiday, then Tenant's obligations under the first sentence of this Section
shall be performed on or prior to the Saturday or business day immediately
preceding such Sunday or holiday. Tenant's obligations under this Section shall
survive the expiration or sooner termination of the Demised Term. Tenant shall
pay to Landlord, for each month (or fraction thereof) during which Tenant fails
to comply with such obligations (referred to as the "Holdover Period") a sum
equal to 150% of the Fixed Rent payable for the month immediately preceding the
Expiration Date. Such payments (referred to as "Holdover Payments") are
acknowledged to be a reasonable approximation of the damages which will be
incurred by Landlord on account of such failure. In no event shall the demand
for or receipt of any Holdover Payments be deemed to preclude Landlord from
seeking to have Tenant evicted from the Demised Premises during the Holdover
Period or pursuing any other available remedy on account of Tenant's failure to
comply with Tenant's obligations under this Section, provided however that
Tenant shall not be liable to Landlord for the payment of damages in excess of
the Holdover Payments for the initial thirty (30) days included as part of the
Holdover Period.

                                   ARTICLE 22

                                 QUIET ENJOYMENT

      Section 22.01. Landlord covenants and agrees with Tenant that upon Tenant
paying the Fixed Rent and additional rent reserved in this Lease and observing
and performing all of the terms, covenants and conditions of this Lease on
Tenant's part to be observed and performed, Tenant may peaceably and quietly
enjoy the Demised Premises during the Demised Term, subject, however, to the
terms, covenants and conditions of this Lease including, but not limited to, the
provisions of Section 39.01, and subject to the Land Disposition Agreement and
the Urban Renewal Plan and the ground and underlying leases and mortgages
referred to in Section 8.01.


                                   ARTICLE 23

                                   ESCALATION

      Section 23.01. In the determination of any increase in the Fixed Rent
under the provisions of this Article, Landlord and Tenant agree as follows:

      A. The term "Escalation Year" shall mean each calendar year which shall
include any part of the Demised Term.

      B. The term "Taxes" shall be deemed to include all real estate taxes and
assessments, special or otherwise, upon or with respect to the Real Property
(including, without limitation, taxes on the buildings and other things erected
or constructed on the premises affected by the Commonwealth Lease by or on
behalf of the tenant thereunder, whether or not constructed on the premises
demised under such lease) imposed by the City of Boston or any other taxing
authority. If, due to any change in the method of taxation, any franchise,
income, profit, sales, rental, use and occupancy or other tax shall be
substituted for or levied against Landlord or any owner or lessee of the
Building or the Real Property, in lieu of any real estate taxes or assessments
upon or with respect to the Real Property, such tax shall be included in the
term "Taxes" for the purposes of this Article. In the event that Landlord is
required to pay any monies to the City of Boston in lieu of real estate taxes
pursuant to the provisions of the Commonwealth Lease, such monies shall be
included in the term "Taxes" for the purposes of this Article.

      C.    The term "Tenant's Proportionate Share" shall be defined as follows:

                                          Tenant's Proportionate Share
            With respect to the:                  shall be:
            -------------------           ----------------------------
            Primary Premises                       12.345%
            Seventh Floor Space                     0.574%
            Expansion Area                          0.892%

      D. The term "Operating Expenses" shall mean the aggregate cost and expense
incurred by Landlord in the operation, maintenance and management of the Real
Property and any plazas, sidewalks and curbs adjacent thereto and the public
park area immediately across Summer Street from the Building and bounded by
Purchase Street, Summer Street, Atlantic Avenue and Congress Street (with
respect to such park, Landlord is sharing costs and expenses with others)
including, without limitation, the cost and expense of the following: salaries,
wages, medical, surgical and general welfare and other so-called "fringe"
benefits (including group insurance and retirement benefits) for employees of
Landlord to the extent engaged in the cleaning, operation, maintenance or
management of the Real Property, and payroll taxes and workmen's compensation
insurance premiums relating thereto, gas, steam, fuel oil, water, sewer rental,
electricity, utility taxes, rubbish removal, fire, casualty, liability, rent and
other insurance carried by Landlord, repairs, repainting, replacement,
maintenance of grounds, Building supplies, uniforms and cleaning thereof, snow
removal, window cleaning, service contracts with independent contractors for any
of the foregoing (including, but not limited to, elevator and air conditioning
maintenance), management fees (whether or not paid to any person, firm or
corporation having an interest in or under common ownership with Landlord or any
of the persons, firms or corporations comprising Landlord), reasonable legal
fees and expenses, including, without limitation, reasonable legal fees and
expenses incurred in connection with any application or proceeding brought for
reduction of the assessed valuation of the Real Property or any part thereof,
auditing fees and all other costs and expenses incurred in connection with the
operation, maintenance and management of the Real Property and any plazas,
sidewalks and curbs adjacent thereto, but excluding, nevertheless, the cost and
expense of the following:

      (i)   leasing commissions;

     (ii)   management fees in excess of generally prevailing rates charged
            by independent third party management companies in the City of
            Boston for buildings of like class and character;

    (iii)   salaries and benefits (including insurance) paid to executives
            above the grade of building manager;

     (iv)   capital improvements and replacements which under generally
            accepted accounting principles and practice would be classified as
            capital expenditures, except the cost and expense of any
            improvement, alteration, replacement or installation made or
            performed after completion of the construction of the Building which
            is either (a) required by law (but only to the extent that the
            applicable requirement is imposed after the Commencement Date), or
            (b) designed, in Landlord's reasonable judgment (as set forth in
            calculations to be furnished to Tenant if Tenant so requests), to
            result in equivalent savings or reductions in Operating Expenses
            over the anticipated useful life thereof (any such improvement,
            alteration, replacement or installation is referred to as "Included
            Improvements"); the cost and expense of Included Improvements shall
            be included in Operating Expenses for any Escalation Year to the
            extent of (x) the annual amortization or depreciation of the cost
            and expense to Landlord of such Included Improvements, as deducted
            by Landlord for Federal income tax purposes for any such Escalation
            Year plus (y) an annual charge for interest upon the unamortized or
            undepreciated portions of such cost and expense at the average Prime
            Rate during the Escalation Year in question;

      (v)   any other item (including reserves) which under generally
            accepted accounting principles and practice would not be regarded as
            an operating, maintenance or management expense;

     (vi)   any item for which Landlord is compensated through proceeds of
            insurance or otherwise (except by tenants pursuant to cost sharing
            provisions comparable hereto), it being understood and agreed that
            Landlord will use reasonable efforts to obtain such compensation
            whenever available;

    (vii)   advertising and promotion;

   (viii)   legal and auditing fees other than reasonable legal and auditing
            fees incurred in connection with the operation, maintenance and
            management of the Building;

     (ix)   payments of principal, interest and any other amounts related to
            mortgages or any other indebtedness;

      (x)   the cost of work done by Landlord for a particular tenant
            (including without limitation architectural, legal or engineering
            costs relating thereto);

     (xi)   depreciation (except as hereinabove permitted);

    (xii)   ground rent;

   (xiii)   attorneys' and other professional fees, costs and disbursements and
            other expenses incurred in connection with negotiations or disputes
            with existing or prospective tenants or other occupants of the
            Property or the sale or mortgaging of the Property or the
            syndication of any interest in the entity comprising Landlord, and
            unrelated in any such case to the operation, maintenance or
            management of the Property;

    (xiv)   general overhead of Landlord and its subsidiaries and affiliates;

     (xv)   advertising and promotional expenditures;

    (xvi)   any fines or penalties incurred on account of violations by
            Landlord of any governmental rule or requirement;

   (xvii)   rentals and other related expenses incurred in leasing air
            conditioning systems, elevators or other equipment ordinarily
            considered part of the basic facilities of an office building,
            except equipment which is used in providing janitorial or other
            services and is not permanently affixed to the Building;

  (xviii)   costs and expenses incurred by Landlord in the performance of its
            obligations with respect to any environmental laws or the removal of
            hazardous substances from the Property;

    (xix)   the cost of special services provided to particular tenants of the
            Building which are not provided to Tenant or which are provided to
            Tenant subject to payment of an additional charge;

     (xx)   costs paid directly by individual tenants to suppliers, including
            (where applicable) tenant electricity, telephone and other utility
            costs;

    (xxi)   the cost of operating any specialty services or commercial
            concessions, including restaurants and clubs;

   (xxii)   the cost of operating the Garage referenced in Article 42 (provided
            however that Operating Expenses shall include the cost of
            maintaining and repairing any structural components, standard
            equipment or common systems of the Building located within the
            Garage);

  (xxiii)   costs of repairs or other work necessitated by fire or other
            casualty or by the exercise of eminent domain;

   (xxiv)   amounts paid to subsidiaries or affiliates of Landlord for services
            rendered to the Property, to the extent such amounts exceed the
            competitive costs of such services; and

    (xxv)   the costs of decorating the lobby or other common areas of the
            Property, including without limitation the cost of acquiring
            sculpture, paintings or other objects of art.

Solely for the purpose of defining Operating Expenses, the cost and expense
incurred by Landlord for electricity in any Escalation Year shall be deemed to
be the total cost and expense to Landlord of purchasing electricity for the
Building in such Escalation Year in excess of the sum of $1,059,653.

      E. The term "Annual Expenses" shall mean the sum of Taxes and Operating
Expenses for any Escalation Year.

      F. The term "Base Expenses" shall mean Annual Expenses incurred with
respect to the calendar year ending December 31, 1996.

      G. The term "Landlord's Escalation Statement" shall mean a statement
containing a computation of any increase in the Fixed Rent pursuant to the
provisions of this Article.

      H. The term "Monthly Escalation Installment" shall mean a sum equal to
one-twelfth (1/12) of the increase in the Fixed Rent payable pursuant to the
provisions of subsection 23.02A for the Escalation Year with respect to which
Landlord has most recently rendered a Landlord's Escalation Statement,
appropriately adjusted to reflect, (i) in the event such Escalation Year is a
partial calendar year, the increase in the Fixed Rent which would have been
payable for such Escalation Year if it had been a full calendar year, and (ii)
current Taxes and current Operating Expenses, as reasonably estimated by
Landlord, rather than Taxes and Operating Expenses as reflected in such
Landlord's Statement, and (iii) any net credit balance to which Tenant may be
entitled pursuant to the provisions of subsection 23.03C.

      I. The term "Monthly Escalation Installment Notice" shall mean a notice
given by Landlord to Tenant which sets forth the current Monthly Escalation
Installment; such notice may be contained in a regular monthly rent bill, in a
Landlord's Escalation Statement, or otherwise, and may be given from time to
time, at Landlord's election.


      Section 23.02. A. If Annual Expenses in any Escalation Year shall be in
such an amount as shall constitute an increase above Base Expenses, the Fixed
Rent for such Escalation Year shall be increased by a sum equal to Tenant's
Proportionate Share of any such increase.

      B. Unless the Commencement Date shall occur on a January 1st, any increase
in the Fixed Rent pursuant to the provisions of subsection A of this Section
23.02, for the Escalation Year in which the Commencement Date shall occur shall
be apportioned in that percentage which the number of days in the period from
the Commencement Date to December 31st of such Escalation Year, both inclusive,
shall bear to the total number of days in such Escalation Year. Unless the
Demised Term shall expire on a December 31st, any increase in the Fixed Rent
pursuant to the provisions of subsection A of this Section 23.02 for the
Escalation Year in which the date of the expiration of the Demised Term shall
occur shall be apportioned in that percentage which the number of days in the
period from January 1st of such Escalation Year to such date of expiration, both
inclusive, shall bear to the total number of days in such Escalation Year.

      Section 23.03. A. Landlord shall render to Tenant, either in accordance
with the provisions of Article 27 or by personal delivery at the Demised
Premises, a Landlord's Escalation Statement with respect to each Escalation Year
on or before the next succeeding October 1st. Landlord's failure to render a
Landlord's Escalation Statement with respect to any Escalation Year shall excuse
Tenant from any obligation to make further payments hereunder for such Year but
shall not prejudice Landlord's right to render a Landlord's Escalation Statement
with respect to any subsequent Escalation Year. The obligations of Tenant under
the provisions of this Article with respect to any increase in the Fixed Rent
shall survive the expiration or any sooner termination of the Demised Term.
Following Tenant's request, made by notice given to Landlord within ninety (90)
days after the rendition of a Landlord's Escalation Statement pursuant hereto,
Landlord shall make available for inspection by Tenant such data in Landlord's
possession as may be reasonably necessary to enable Tenant to verify any
computation set forth in such Statement.

      B. Within thirty (30) days next following rendition of the first
Landlord's Escalation Statement which shows an increase in the Fixed Rent for
any Escalation Year, Tenant shall pay to Landlord the entire amount of such
increase. In order to provide for current payments on account of future
potential increases in the Fixed Rent which may be payable by Tenant pursuant to
the provisions of subsection 23.02A, Tenant shall also pay to Landlord at such
time, provided Landlord has given to Tenant a Monthly Escalation Installment
Notice, a sum equal to the product of (i) the Monthly Escalation Installment set
forth in such Notice multiplied by (ii) the number of months or partial months
which shall have elapsed between January 1st of the Escalation Year in which
such payment is made and the date of such payment; thereafter, Tenant shall make
payment of a Monthly Escalation Installment throughout each month of the Demised
Term. Monthly Escalation Installments shall be added to and payable as part of
each monthly installment of Fixed Rent.

      C. Following rendition of each subsequent Landlord's Escalation Statement,
a reconciliation shall be made as follows: Tenant shall be debited with any
increase in the Fixed Rent shown on such Landlord's Escalation Statement and
credited with the aggregate amount, if any, paid by Tenant in accordance with
the provisions of subsection B of this Section on account of potential future
increases in the Fixed Rent pursuant to subsection 23.02A which has not
previously been credited against increases in the Fixed Rent shown on Landlord's
Escalation Statements. Tenant shall pay any net debit balance to Landlord within
thirty (30) days next following rendition by Landlord, in accordance with the
provisions of Article 27, of an invoice for such net debit balance; any net
credit balance shall be applied as an adjustment against the next accruing
Monthly Escalation Installments as provided in subsection H of Section 23.01.
All sums payable by Tenant under this Article shall be collectible by Landlord
in the same manner as Fixed Rent. Such credit shall be payable to Tenant in the
event the Demised Term shall have ended.

      Section 23.04. A. In the determination of any increase in the Fixed Rent
pursuant to the foregoing provisions of this Article 23, (i) if, during any
Escalation Year, the Building shall not have been fully occupied or Landlord
shall not have supplied all tenants of the Building with the same services being
supplied hereunder, Operating Expenses for such Escalation Year shall be
equitably adjusted (by including such additional expenses as Landlord would have
incurred) to the extent, if any, required to reflect full occupancy and the
supplying of equivalent services. A comparable adjustment shall be made in the
determination of Base Expenses.

      B. If, as a result of any application or proceeding brought by or on
behalf of Landlord for reduction of the assessed valuation of the Real Property,
there shall be a decrease in Taxes for any Escalation Year with respect to which
Landlord shall have previously rendered a Landlord's Escalation Statement,
Landlord's Escalation Statement next following such decrease shall include an
adjustment of the Fixed Rent for such Escalation Year reflecting a credit to
Tenant equal to the amount by which (i) the Fixed Rent actually paid by Tenant
with respect to such Escalation Year (as increased pursuant to the provisions of
subsection A of Section 23.02) shall exceed (ii) the Fixed Rent payable with
respect to such Escalation Year (as increased pursuant to the operation of the
provisions of subsection A of Section 23.02) based upon such reduction of the
assessed valuation.

      Section 23.05. A. In the event of any dispute between Landlord and Tenant
arising out of the application of the provisions of this Article, such dispute
shall be determined by arbitration in accordance with the provisions of Article
33. Notwithstanding any dispute and submission to arbitration, any increase in
the Fixed Rent shown upon any Landlord's Escalation Statement or any Monthly
Escalation Installment Notice shall be payable by Tenant within the time
limitation set forth in this Article. If the determination in such arbitration
shall be adverse to Landlord, any amount paid by Tenant to Landlord in excess of
the amount determined to be properly payable shall be credited against the next
accruing installments of Fixed Rent due under this Lease.

      B. In the event Tenant disagrees with any computation or other matter
contained in any Landlord's Escalation Statement or any Monthly Escalation
Installment Notice, Tenant shall have the right to give notice to Landlord
within ninety (90) days next following rendition of such Statement or Notice
setting forth the particulars of such disagreement. If the matter is not
resolved within ninety (90) days next following the giving of such notice by
Tenant, it shall be deemed a dispute which either party may submit to
arbitration pursuant to the provisions of subsection A of this Section. If (i)
Tenant does not give a timely notice to Landlord in accordance with the
foregoing provisions of this subsection disagreeing with any computation or
other matter contained in any Landlord's Escalation Statement or any Monthly
Escalation Installment Notice, or (ii) if any such timely notice shall have been
given by Tenant, the matter shall not have been resolved and neither party shall
have submitted the dispute to arbitration within ninety (90) days next following
the giving of such notice by Tenant, Tenant shall be deemed conclusively to have
accepted such Landlord's Escalation Statement or Monthly Escalation Installment
Notice, as the case may be, and shall have no further right to dispute the same.


                                   ARTICLE 24

                                    NO WAIVER

      Section 24.01. Neither any option granted to Tenant in this Lease to renew
or extend the Demised Term, nor the exercise of any such option by Tenant, shall
prevent Landlord from exercising any option or right granted or reserved to
Landlord in this Lease or which Landlord may have by virtue of any law, to
terminate this Lease and the Demised Term or any renewal or extension of the
Demised Term either during the original Demised Term or during the renewed or
extended term on account of any Event of Default. Any such termination of this
Lease and the Demised Term shall serve to terminate any such renewal or
extension of the Demised Term and any right of Tenant to any such renewal or
extension, whether or not Tenant shall have exercised any such option to renew
or extend the Demised Term. Any such option or right on the part of Landlord to
terminate this Lease shall continue during any extension or renewal of the
Demised Term. No option granted to Tenant to renew or extend the Demised Term
shall be deemed to give Tenant any further option to renew or extend.

      Section 24.02. No act or thing done by Landlord or Landlord's agents
during the Demised Term shall constitute a valid acceptance of a surrender of
the Demised Premises or any remaining portion of the Demised Term except a
written instrument accepting such surrender, executed by Landlord. No employee
of Landlord or of Landlord's agents shall have any authority to accept the keys
of the Demised Premises prior to the termination of this Lease and the Demised
Term, and the delivery of such keys to any such employee shall not operate as a
termination of this Lease or a surrender of the Demised Premises; however, if
Tenant desires to have Landlord sublet the Demised Premises for Tenant's
account, Landlord or Landlord's agents are authorized to receive said keys for
such purposes without releasing Tenant from any of its obligations under this
Lease. The failure of either party to seek redress for breach or violation of,
or to insist upon the strict performance of, any term, covenant or condition of
this Lease on the part of the other party to be observed or performed, shall not
prevent a subsequent act or omission which would have originally constituted a
breach or violation of any such term, covenant or condition from having all the
force and effect of an original breach or violation. The receipt by Landlord of
rent with knowledge of the breach or violation by Tenant of any term, covenant
or condition of this Lease on Tenant's part to be observed or performed shall
not be deemed a waiver of such breach or violation. Landlord's failure to
enforce any Building Rule, as defined in Article 35, against Tenant or against
any other tenant or occupant of the Building shall not be deemed a waiver of any
such Building Rule. No provision of this Lease shall be deemed to have been
waived by either party unless such waiver shall be set forth in a written
instrument executed by such party. No payment by Tenant or receipt by Landlord
of a lesser amount than the aggregate of all Fixed Rent and additional rent then
due under this Lease shall be deemed to be other than on account of the first
accruing of all such items of Fixed Rent and additional rent then due. No
endorsement or statement on any check and no letter accompanying any check or
other rent payment in any such lesser amount and no acceptance of any such check
or other such payment by Landlord shall constitute an accord and satisfaction,
and Landlord may accept any such check or payment without prejudice to
Landlord's right to recover the balance of such rent or to pursue any other
legal remedy.


                                   ARTICLE 25

                         MUTUAL WAIVER OF TRIAL BY JURY

      Section 25.01. Landlord and Tenant hereby waive trial by jury in any
action, proceeding or counterclaim brought by Landlord or Tenant against the
other on any matter whatsoever arising out of or in any way connected with this
Lease, the relationship of landlord and tenant, the use or occupancy of the
Demised Premises by Tenant or any person claiming through or under Tenant, any
claim of injury or damage, and any emergency or other statutory remedy; however,
the foregoing waiver shall not apply to any action for personal injury or
property damage. The provisions of the foregoing sentence shall survive the
expiration or any sooner termination of the Demised Term. If Landlord commences
any action or proceeding for nonpayment of rent, Tenant agrees not to interpose
any counterclaim of whatever nature or description in any such action or
proceeding, except to the extent that Tenant's failure to do so would preclude
Tenant from asserting the same claim in a separate action.


                                   ARTICLE 26

                              INABILITY TO PERFORM

      Section 26.01. If, by reason of strikes or other labor disputes, fire or
other casualty (or reasonable delays in adjustment of insurance), accidents,
orders or regulations of any Federal, State, County or Municipal authority, or
any other cause beyond Landlord's reasonable control, whether or not such other
cause shall be similar in nature to those hereinbefore enumerated, Landlord is
unable to furnish or is delayed in furnishing any utility or service required to
be furnished by Landlord under the provisions of Article 31 or any other Article
of this Lease or any collateral instrument, or is unable to perform or make or
is delayed in performing or making any installations, decorations, repairs,
alterations, additions or improvements, whether or not required to be performed
or made under this Lease or under any collateral instrument, or is unable to
fulfill or is delayed in fulfilling any of Landlord's other obligations under
this Lease or any collateral instrument, no such inability or delay shall
constitute an actual or constructive eviction, in whole or in part, or entitle
Tenant to any abatement or diminution or rent, or relieve Tenant from any of its
obligations under this Lease, or impose any liability upon Landlord or its
agents by reason of inconvenience or annoyance to Tenant, or injury to or
interruption of Tenant's business, or otherwise.


                                   ARTICLE 27

                                     NOTICES

      Section 27.01. Except as otherwise expressly provided in this Lease, any
bills, statements, notices, demands, requests or other communications given or
required to be given under this Lease shall be effective only if rendered or
given in writing (whether or not the applicable provision so specifies), sent by
certified mail (return receipt requested), addressed (a) to Tenant at the
Demised Premises, or (b) to Landlord at Landlord's address set forth in this
Lease, or (c) addressed to such other address as either Landlord or Tenant may
designate as its new address for such purpose by notice given to the other in
accordance with the provisions of this Section. Any such bill, statement,
notice, demand, request or other communication shall be deemed to have been
rendered or given on the date when it shall have been mailed as provided in this
Section.


                                   ARTICLE 28

                               PARTNERSHIP TENANT

      Section 28.01. If Tenant is a partnership (or is comprised of two (2) or
more persons, individually and as co-partners of a partnership) or if Tenant's
interest in this Lease shall be assigned to a partnership (or to two (2) or more
persons, individually and as co-partners of a partnership) pursuant to Article
12 (any such partnership and such persons are referred to in this Section as
"Partnership Tenant"), the following provisions of this Section shall apply to
such Partnership Tenant: (i) the liability of each of the persons comprising
Partnership Tenant shall be joint and several, individually and as a partner,
and (ii) each of the persons comprising Partnership Tenant, whether or not such
person shall be one of the persons comprising Tenant at the time in question,
hereby consents in advance to, and agrees to be bound by, any written instrument
which may hereafter be executed, changing, modifying or discharging this Lease,
in whole or in part, or surrendering all or any part of the Demised Premises to
Landlord, and by any notices, demands, requests or other communications which
may hereafter be given, by Partnership Tenant or by any of the persons
comprising Partnership Tenant, and (iii) any bills, statements, notices,
demands, requests or other communications given or rendered to Partnership
Tenant or to any of the persons comprising Partnership Tenant shall be deemed
given or rendered to Partnership Tenant and to all such persons and shall be
binding upon Partnership Tenant and all such persons, and (iv) if Partnership
Tenant shall admit new partners, all of such new partners shall, by their
admission to Partnership Tenant, be deemed to have assumed performance of all of
the terms, covenants and conditions of this Lease on Tenant's part to be
observed and performed, and shall be liable for such performance, together with
all other partners, jointly or severally, individually and as a partner, and (v)
Partnership Tenant shall give prompt notice to Landlord of the admission of any
such new partners, and upon demand of Landlord, shall cause each such new
partner to execute and deliver to Landlord an agreement in form satisfactory to
Landlord, wherein each such new partner shall so assume performance of all of
the terms, covenants and conditions of this Lease on Tenant's part to be
observed and performed (but neither Landlord's failure to request any such
agreement nor the failure of any such new partner to execute or deliver any such
agreement to Landlord shall vitiate the provisions of subdivision (iv) of this
Section.) The provisions of Section relating to the partners of Partnership
Tenant shall not be deemed to apply to limited partners otherwise exempt from
liability for the debts and other obligations of Partnership Tenant.


                                   ARTICLE 29

                                  CIVIL RIGHTS

      Section 29.01. To the extent required by the provisions of the Land
Disposition Agreement and the Commonwealth Lease, Tenant agrees (i) not to
discriminate on the basis of race, creed, color, sex, disability or national
origin in the use or occupancy of the Demised Premises, and (ii) to use the
Demised Premises in compliance with all other requirements imposed by or
pursuant to Title 49, Code of Federal Regulations, Department of Transportation,
Subtitle A, Office of the Secretary, Part 21, Nondiscrimination in
Federally-assisted programs of the Department of Transportation-Effectuation of
Title VI of the Civil Rights Act of 1964, and as said Regulations may be
amended. To the fullest extent permitted by law and equity, the foregoing
covenants shall be binding for the benefit and in favor of, and enforceable by,
the Authority and the United States of America, and it is intended and agreed
that the Authority and the United States of America shall be deemed to be the
beneficiaries of the foregoing covenants, both for and in their own rights and
also for the purpose of protecting the interests of the community and other
parties, public or private, in whose favor and for whose benefit such covenants
have been provided.


                                   ARTICLE 30

                            SPECIAL WAIVER OF CLAIMS

      Section 30.01. Tenant shall not have or make any claim against Landlord or
the landlord under the Commonwealth Lease for or by reason of the ownership, use
or occupancy of the Non-Leased Premises, or on account of noise, vibration,
fumes, odor or air quality or like effects resulting from the ownership, use,
occupancy, construction or maintenance of the Non-Leased Premises by said
landlord under the Commonwealth Lease, except that the foregoing provision shall
not release said landlord under the Commonwealth Lease from any claims for
damage or injury caused by the negligence of said landlord or its agents,
servants, employees, contractors or licensees.


                                   ARTICLE 31

                             UTILITIES AND SERVICES

      Section 31.01. Landlord, at Landlord's expense, shall furnish necessary
elevator facilities on business days from 8:00 A.M. to 6:00 P.M. and shall have
a passenger elevator subject to call at all other times. At any time or times
all or any of the elevators in the Building may, at Landlord's option, be
automatic elevators, and Landlord shall not be required to furnish any operator
service for automatic elevators. If Landlord shall, at any time, elect to
furnish operator service for any automatic elevators, Landlord shall have the
right to discontinue furnishing such service with the same effect as if Landlord
had never elected to furnish such service. Landlord shall not dedicate for the
exclusive use of any tenant any of the elevators presently servicing the floors
of the Building on which portions of the Demised Premises are located.

      Section 31.02. Landlord, at Landlord's expense, shall furnish and
distribute to the Demised Premises through the Building heating, ventilating and
air conditioning (referred to as "HVAC") system, when required for the
comfortable occupancy of the Demised Premises in accordance with standards
generally prevailing in the case of office buildings of similar construction and
class in the Boston, Massachusetts area, heated, cooled and outside air, at
reasonable temperatures, pressures and degrees of humidity and in reasonable
volumes and velocities, on a year round basis, from 8:00 A.M. to 6:00 P.M. on
business days. For purposes of this Section, the term "business days" shall be
deemed to include any day on which the New York Stock Exchange is open for the
conduct of regular business. Notwithstanding the foregoing provisions of this
Section, Landlord shall not be responsible if the normal operation of the
Building HVAC system shall fail to provide conditioned air at reasonable
temperatures, pressures or degrees of humidity or in reasonable volumes or
velocities in any portions of the Demised Premises (a) which shall have an
electrical load in excess of six (6) watts per square foot of usable area for
all purposes (including lighting and power), or which shall have a human
occupancy factor in excess of one person per 100 square feet of usable area (the
average electrical load and human occupancy factors for which the Building HVAC
system has been designed) or (b) because of any rearrangement of partitioning or
other Alterations made or performed by or on behalf of Tenant or any person
claiming through or under Tenant to the extent that any of the foregoing
adversely affect the operation of the Building HVAC system. Notwithstanding such
design of the Building HVAC system, Tenant acknowledges that the electrical load
in the Demised Premises which shall conform to the energy conservation
provisions of the Massachusetts Building Code and may accordingly be less than
six (6) watts per square foot of usable area for all purposes (including
lighting and power). Whenever said HVAC system is in operation, Tenant agrees to
cause all windows of the Demised Premises to be kept closed and to cause the
venetian blinds in the Demised Premises to be kept closed if necessary because
of the position of the sun. Tenant agrees to cause all the windows of the
Demised Premises to be closed whenever the Demised Premises are not occupied.
Tenant shall cooperate fully with Landlord at all times and abide by all
regulations and requirements which Landlord may reasonably prescribe for the
proper functioning and protection of the HVAC system.

      Section 31.03. A. Provided Tenant shall keep the Demised Premises in
reasonable order, Landlord, at Landlord's expense, shall cause the office areas
of the Demised Premises to be cleaned, in accordance with the standards set
forth in Schedule C, all of the terms, covenants and conditions of which are
incorporated in this Lease by reference and shall be deemed a part of this
Lease, as though fully set forth in the body of this Lease. Tenant acknowledges
that Landlord's obligation to cause the office areas of the Demised Premises to
be cleaned excludes, except to the extent of emptying wastepaper baskets, damp
mopping hard flooring and carpet sweeping carpeted areas, any portions of the
Demised Premises not used as office areas (e.g., storage, mail and computer
areas, private lavatories and areas used for the storage, preparation, service
or consumption of food or beverages). Tenant shall pay to Landlord the cost of
removal from the Building of any of Tenant's refuse or rubbish which Landlord is
not obligated to remove hereunder, and Tenant, at Tenant's expense, shall cause
all portions of the Demised Premises not used as office areas to be cleaned
regularly (except to the extent of Landlord's obligations hereunder) in a manner
reasonably satisfactory to Landlord. Tenant also shall cause all portions of the
Demised Premises used for the storage, preparation or consumption of food or
beverages to be exterminated against infestation by vermin, roaches or rodents
regularly and, in addition, whenever there shall be evidence of any infestation.
Tenant shall contract independently with Landlord or its cleaning services
contractor for the removal of such other refuse and rubbish and for cleaning
services in addition to those furnished by Landlord and for the purpose of
providing extermination services required to be performed by Tenant, but only to
the extent that such contract provides for competitive pricing.

      B. Tenant acknowledges and is aware that the cleaning services to be
furnished by Landlord pursuant to this Section may be furnished by a contractor
or contractors employed by Landlord and agrees that Landlord shall not be deemed
in default of any of its obligations under this Section 31.03 unless such
default shall continue beyond such time as is reasonably required to cure such
default after notice from Tenant to Landlord setting forth the specific nature
of such default (so long as Landlord commences within ten (10) days after such
notice, and thereafter diligently prosecutes to completion, all action necessary
to cure such default).

      Section 31.04. A. Landlord, at Landlord's expense, shall redistribute or
furnish electrical energy to or for the use of Tenant in the Demised Premises
for the operation of the lighting fixtures and the electrical receptacles in
accordance with the provisions of this Lease. There shall be no specific charge
by way of measuring such electrical energy on any meter or otherwise, as the
charge for the service of redistributing or furnishing such electrical energy
has been included in the Fixed Rent on a so-called "rent inclusion" basis. If
either the quantity or character of electrical service is changed by the public
utility corporation supplying electrical service to the Building or is no longer
available or suitable for Tenant's requirements for reasons other than the
negligence or wilful misconduct of Landlord, no such change, unavailability or
unsuitability shall constitute an actual or constructive eviction, in whole or
in part, or entitle Tenant to any abatement or diminution of rent, or relieve
Tenant from any of its obligations under this Lease, or impose any liability,
upon Landlord, or its agents, by reason of inconvenience or annoyance to Tenant,
or injury to or interruption of Tenant's business, or otherwise.

      B. Tenant covenants that (i) at no time shall the use of electrical energy
in the Demised Premises exceed the capacity of the existing feeders or wiring
installations then serving the Demised Premises, (ii) notwithstanding anything
to the contrary which may be contained in Article 4, it shall use the electrical
receptacles in the Demised Premises only for lamps, typewriters, word processing
machines, photocopiers and similar ordinary and usual office equipment and
machinery as well as for appliances included as part of any kitchen facilities
installed in accordance with the provisions of this Lease, and (iii) it shall
not connect any computers (other than customary desk-top computers) or other
high electrical consuming machines without the prior consent of Landlord in each
instance (which consent shall not be unreasonably withheld or delayed). Tenant
shall not make or perform, or permit the making or performance of, any
Alterations to wiring installations or other electrical facilities in or serving
the Demised Premises or any material additions to the business machines, office
equipment or other appliances in the Demised Premises which utilize electrical
energy without the prior consent of Landlord in each instance (which consent
shall not be unreasonably withheld or delayed). Any such Alterations, additions
or consent by Landlord shall be subject to the provisions of this Lease
including, but not limited to, the provisions of Article 4.

      C. Landlord may, at any time, elect to discontinue the redistribution or
furnishing of electrical energy to the Building in its entirety. In the event of
any such election by Landlord, (i) Landlord agrees to give reasonable advance
notice of any such discontinuance to Tenant sufficient to enable Tenant to
prevent any interruption of electrical service to the Demised Premises; (ii)
Landlord agrees to permit Tenant to receive electrical service directly from the
public utility corporation supplying electrical service to the Building and to
permit the existing feeders, risers, wiring and other electrical facilities
serving the Demised Premises to be used by Tenant for such purpose to the extent
they are suitable and safely capable; (iii) Landlord agrees to pay such charges
and costs, if any, as such public utility corporation may impose in connection
with the installation of Tenant's meters; (iv) the Fixed Rent shall be
decreased, as of the date of such discontinuance, by the Electrical Inclusion
Factor to reflect such discontinuance; (v) the last sentence of subsection D of
Section 23.01 shall be deemed revised to read as follows: "Solely for the
purpose of defining Operating Expenses, the cost and expense incurred by
Landlord for electricity shall be deemed to be the reasonably-estimated total
cost and expense of Landlord for purchasing electricity for the common areas and
facilities of the Building."; and (vi) this Lease shall remain in full force and
effect and such discontinuance shall not constitute an actual or constructive
eviction, in whole or in part, or entitle Tenant to any abatement or diminution
of rent except as expressly provided in subdivision (iv) of this subsection C,
or relieve Tenant from any of its obligations under this Lease or impose any
liability upon Landlord or its agents by reason of inconvenience or annoyance to
Tenant, or injury to or interruption of Tenant's business, or otherwise.

      Section 31.05. Landlord shall furnish water to the Demised Premises for
ordinary lavatory and drinking purposes to the extent required to service
facilities installed in accordance with the provisions of this Lease. If Tenant
requires, uses or consumes water for any other purpose, Landlord may install a
hot water meter and a cold water meter and thereby measure Tenant's consumption
of water for all purposes. Tenant shall pay to Landlord the cost of any such
meters and their installation, and Tenant shall keep any such meters and any
such installation equipment in good working order and repair, at Tenant's cost
and expense. Tenant agrees to pay for water consumed as shown on said meters and
sewer charges, taxes and any other governmental charges thereon, as and when
bills are rendered. In addition to any sums required to be paid by Tenant for
hot water consumed and sewer charges thereon under the foregoing provisions of
this Section, Tenant agrees to pay to Landlord, for the heating of said hot
water, an amount equal to three (3x) times the total of said sums required to be
paid by Tenant for hot water and sewer charges, taxes and any other governmental
charges thereon. For the purposes of determining the amount of any sums required
to be paid by Tenant under this Section, all hot and cold water consumed during
any period when said meters are not in good working order shall be deemed to
have been consumed at the rate of consumption of such water during the most
comparable period when such meters were in good working order.

      Section 31.06. The Fixed Rent does not reflect or include any charge to
Tenant for the furnishing or distributing of any freight elevator or HVAC
services to the Demised Premises during periods (referred to as "Overtime
Periods") other than the hours and days set forth above in this Article for the
furnishing and distributing of such services. Accordingly, if Landlord shall
furnish any such freight elevator or HVAC services to the Demised Premises at
the request of Tenant during Overtime Periods, Tenant shall pay Landlord for
such services at the standard rates then fixed by Landlord for the Building. The
standard Building rate currently fixed by Landlord for HVAC service during
Overtime Periods, as applied to each floor of the Building on which the Demised
Premises are located, is currently $52.00 per hour and shall be subject to
increase hereafter only to the extent required to allow for reimbursement of any
increase in the costs incurred by Landlord to provide such service (it being
understood and agreed that all such costs presently incurred have been included
as part of said current rate). Landlord shall not be required to furnish any
such services during Overtime Periods unless Landlord has received reasonable
advance notice from Tenant requesting such services. If Tenant fails to give
Landlord reasonable advance notice requesting such services during any Overtime
Periods, then, whether or not the Demised Premises are habitable during such
Periods, failure by Landlord to furnish or distribute any such services during
such Periods shall not constitute an actual or constructive eviction, in whole
or in part, or entitle Tenant to any abatement or diminution of rent, or relieve
Tenant from any of its obligations under this Lease, or impose any liability
upon Landlord or its agents by reason of inconvenience or annoyance to Tenant,
or injury to or interruption of Tenant's business, or otherwise. Tenant shall be
deemed to have given reasonable advance notice requesting such services during a
particular Overtime Period if such notice is given to Landlord's managing agent
(a) in the case of any such Overtime Period commencing on a business day, no
later than Noon on such day or (b) in the case of any such Overtime Period
commencing on a day other than a business day, no later than Noon on the
immediately preceding business day.

      Section 31.07. Landlord reserves the right to stop the service of the
HVAC, elevator, plumbing, electrical or other mechanical systems or facilities
in the Building when necessary by reason of accident or emergency, or (after
prior notice to Tenant) for repairs, alterations, replacements or improvements,
which, in the judgment of Landlord are desirable or necessary, until said
repairs, alterations, replacements or improvements shall have been completed.
The exercise of such right by Landlord shall not constitute an actual or
constructive eviction, in whole or in part, or entitle Tenant to any abatement
or diminution of rent (except as may be otherwise set forth in Section 45.02),
or relieve Tenant from any of its obligations under this Lease, or impose any
liability upon Landlord or its agents by reason of inconvenience or annoyance to
Tenant, or injury to or interruption of Tenant's business, or otherwise,
provided however that Landlord shall (without any obligation to employ labor at
so-called "overtime" or other premium pay rates) use reasonable efforts to
minimize such inconvenience, annoyance, injury and interruption.

      Section 31.08. Tenant shall have, appurtenant to the Demised Premises, the
non-exclusive right to use the loading dock and freight elevator servicing the
Building. Landlord shall endeavor to assure that Tenant has access to such
facilities at reasonable times as set forth in a proposed schedule to be
furnished from time to time by Tenant. Such usage shall be without charge except
during Overtime Periods. In no event shall Landlord be subject to liability on
account of delays in the availability of such facilities.

      Section 31.09. Landlord currently arranges for security personnel to be
present in the lobby of the Building between the hours of 6:00 P.M. and 8:00
A.M. on business days and at all hours on Saturdays, Sundays and holidays in
order to monitor access to the Building and deter the unauthorized removal of
property belonging to tenants. Landlord shall not substantially reduce the level
of security presently afforded by such personnel. The foregoing provisions shall
in no event be construed as a covenant by Landlord as to the adequacy of any
particular security program, and Tenant acknowledges its responsibility to take
whatever additional precautions may be advisable to safeguard the Demised
Premises and restrict the removal of property therefrom.

      Section 31.10. Landlord shall keep lit all common areas of the Building
used by Tenant to obtain access to the Demised Premises. Such access shall be
available at all times, subject to Landlord's reasonable security requirements.

      Section 31.11. If any portion of the common areas of the Building become
infested with vermin, Landlord shall arrange for the extermination thereof.


                                   ARTICLE 32

                                    CAPTIONS

      Section 32.01. The captions preceding the Articles of this Lease have been
inserted solely as a matter of convenience and such captions in no way define or
limit the scope or intent of any provision of this Lease.


                                   ARTICLE 33

                                ARBITRATION, ETC.

      Section 33.01. Any dispute with respect to (i) the reasonability of any
failure or refusal of Landlord to grant its consent or approval to any request
for such consent or approval pursuant to the provisions of Sections 4.01 or
12.03 with respect to which request Landlord has agreed, in such Sections, not
unreasonably to withhold such consent or approval, or (ii) arising out of the
application of the provisions of Articles 23 or 35, which is submitted to
arbitration shall be finally determined by arbitration in the City of Boston in
accordance with the Commercial Arbitration Rules of the American Arbitration
Association or its successor. Any such determination shall be final and binding
upon the parties, whether or not a judgment shall be entered in any court. In
making their determination, the arbitrators shall not subtract from, add to, or
otherwise modify any of the provisions of this Lease. Landlord and Tenant may,
at their own expense, be represented by counsel and employ expert witnesses in
any such arbitration. Any dispute with respect to the reasonability of any
failure or refusal of Landlord to grant its consent or approval to any request
for such consent or approval pursuant to any of the provisions of this Lease
(other than Sections 4.01 and 12.03) with respect to which Landlord has
covenanted not unreasonably to withhold such consent or approval, shall be
determined by applicable legal proceedings. If the determination of any such
legal proceedings, or of any arbitration held pursuant to the provisions of this
Section with respect to disputes arising under Sections 4.01 and 12.03, shall be
adverse to Landlord, Landlord shall be deemed to have granted the requested
consent or approval, but that shall be Tenant's sole remedy in such event and
Landlord shall not be liable to Tenant for a breach of Landlord's covenant not
unreasonably to withhold such consent or approval, or otherwise.


                                   ARTICLE 34

                               ADJACENT EXCAVATION

      Section 34.01. If an excavation shall be made upon land adjacent to the
Building, or shall be authorized to be made, Tenant shall, to the extent that
Landlord is required so to do, afford to the person causing or authorized to
cause such excavation, license (subject to the same provisions applicable
hereunder in the case of work to be performed by Landlord) to enter upon the
Demised Premises for the purpose of doing such work as said person shall deem
necessary to preserve the walls and other portions of the Building from injury
or damage and to support the same by proper foundations and no such entry shall
constitute an actual or constructive eviction, in whole or in part, or entitle
Tenant to any abatement or diminution or rent, or relieve Tenant from any of its
obligations under this Lease, or impose any liability upon Landlord or said
person.


                                   ARTICLE 35

                                 BUILDING RULES

      Section 35.01. Tenant shall observe faithfully, and comply with, and shall
not permit the violation of, the Building Rules set forth in Schedule B annexed
to and made a part of this Lease and such additional reasonable Building Rules
as Landlord may, from time to time, adopt (so long as Tenant has been notified
thereof). All of the terms, covenants and conditions of Schedule B are
incorporated in this Lease by reference and shall be deemed part of this Lease
as though fully set forth in the body of this Lease. The term "Building Rules"
as used in this Lease shall include those set forth in Schedule B and those
hereafter made or adopted as provided in this Section. In case Tenant disputes
the reasonableness of any additional Building Rule hereafter adopted by Landlord
such dispute shall be determined by arbitration in accordance with the
provisions of Article 33. Tenant's rights to dispute the reasonableness of any
additional Building Rule shall be deemed waived unless asserted by service of a
notice upon Landlord within thirty (30) days after the date upon which Landlord
shall give notice to Tenant of the adoption of any such additional Building
Rule. All Building Rules shall be applied uniformly to other tenants whose
permitted business activities are comparable to those of Tenant hereunder,
provided however that Landlord's failure or refusal to enforce any Building
Rule, or any term, covenant or condition of any other lease, against any other
tenant or occupant of the Building shall not constitute an actual or
constructive eviction, in whole or in part, or entitle Tenant to any abatement
or diminution of rent, or relieve Tenant from any of its obligations under this
Lease, or impose any liability upon Landlord or its agents by reason of
inconvenience or annoyance to Tenant, or injury to or interruption of Tenant's
business, or otherwise.


                                   ARTICLE 36

                                     BROKER

      Section 36.01. Each party represents and warrants that McCall & Almy
(whose fee shall be payable by Landlord pursuant to a separate agreement) is the
sole broker with whom such party has negotiated or otherwise dealt in connection
with the Demised Premises or in bringing about this Lease. Each party shall
indemnify and save the other harmless of and from all loss, cost, liability,
damage and expense, including, but not limited to, reasonable counsel fees,
arising on account of any such negotiations or dealings by such party.

                                   ARTICLE 37

                                  SEVERABILITY

      Section 37.01. If any term of this Lease, or the application thereof to
any person or circumstances, shall to any extent be invalid or unenforceable,
the remainder of this Lease, or the application of such term to persons or
circumstances other than those as to which it is invalid or unenforceable, shall
not be affected thereby, and each term of this Lease shall be valid and
enforceable to the fullest extent permitted by law.


                                   ARTICLE 38

                                ENTIRE AGREEMENT

      Section 38.01. This Lease contains the entire agreement between the
parties and all prior negotiations and agreements are merged in this Lease.
Neither Landlord nor Landlord's agents have made any representations or
warranties with respect to the Demised Premises, the Building, the Real Property
or this Lease except as expressly set forth in this Lease and no rights,
easements or licenses are or shall be acquired by Tenant by implication or
otherwise unless expressly set forth in this Lease. This Lease may not be
changed, modified or discharged, in whole or in part, orally and no executory
agreement shall be effective to change, modify or discharge, in whole or in
part, Lease or any obligations under this Lease, unless such agreement is set
forth in a written instrument executed by the party against whom enforcement of
the change, modification or discharge is sought. Wherever in this Lease it is
provided that Landlord's consent or approval is required, Landlord shall have
the right to withhold such consent or approval arbitrarily unless otherwise
specifically provided to the contrary. All references in this Lease to the
consent or approval of Landlord shall be deemed to mean the written consent of
Landlord or the written approval of Landlord, as the case may be, and no consent
or approval of Landlord shall be effective for any purpose unless such consent
or approval is set forth in a written instrument executed by Landlord.


                                   ARTICLE 39

                                  PARTIES BOUND

      Section 39.01. The terms, covenants and conditions contained in this Lease
shall bind and inure to the benefit of Landlord and Tenant and, except as
otherwise provided in this Lease, their respective heirs, distributees,
executors, administrators, successors and assigns. However, the obligations of
Landlord under this Lease shall no longer be binding upon Landlord named herein
after the sale, assignment or transfer by Landlord named herein (or upon any
subsequent Landlord after the sale, assignment or transfer by such subsequent
Landlord) of its interest in the Building as owner or lessee, and in the event
of any such sale, assignment or transfer, such obligations shall thereafter be
binding upon the grantee, assignee or other transferee of such interest, and any
such grantee, assignee or transferee, by accepting such interest, shall be
deemed to have assumed such obligations. Notwithstanding the foregoing, Landlord
shall not be relieved from liability hereunder with respect to matters arising
prior to such sale, assignment or transfer. A lease of the entire Building shall
be deemed a transfer within the meaning of the foregoing sentence. Tenant shall
look solely to the estate and interest of Landlord, its successors and assigns,
in the Real Property and Building for the collection or satisfaction of any
judgment recovered against Landlord based upon the breach by Landlord of any of
the terms, conditions or covenants of this Lease on the part of Landlord to be
performed, and no other property or assets of Landlord shall be subject to levy,
execution or other enforcement procedure for the satisfaction of Tenant's
remedies under or with respect to either this Lease, the relationship of
landlord and tenant hereunder, or Tenant's use and occupancy of the Demised
Premises.

                                   ARTICLE 40

                                 EXISTING LEASE

      Section 40.01. The existing Lease between the parties dated February 15,
1985, as from time to time amended, is hereby terminated with the same force and
effect as if the date hereof were the Expiration Date thereunder. To the extent
that Tenant has made payments to Landlord pursuant to said Lease in excess of
the amounts due hereunder for the period commencing June 1, 1996, Tenant shall
be entitled to a credit in the amount of such excess (which the parties
acknowledge to be $1,241,418), to be applied against installments of Fixed Rent
becoming due hereunder on and after February 1, 1997.


                                   ARTICLE 41

                            EXTENSION OF DEMISED TERM

      Section 41.01. A. Provided Tenant shall not then be in default beyond the
applicable grace period in the observance or performance of any term, covenant
or condition of this Lease on Tenant's part to be observed or performed, Tenant
may extend the Demised Term for three (3) additional periods of five (5) years
each by written notice to Landlord given at least twelve (12) months prior to
the commencement of the applicable extension period (referred to as the
"Exercise Deadline"), on the same terms and conditions set forth herein, except
that Tenant shall have no further option to extend said Term and except further
that rent payable with respect to each such extension period shall be
established by Landlord after receipt of Tenant's notice exercising its option
hereunder, in an amount equivalent to the fair market rental value of the
Demised Premises during said extension period, as determined by Landlord subject
to Tenant's right to object thereto as hereinafter set forth. Such determination
is hereafter referred to as "Landlord's Proposal".

      B. In the event that Tenant objects to Landlord's Proposal with respect to
a particular extension period and notifies Landlord of such objection within ten
(10) days following receipt of such Proposal, said value shall be determined by
appraisers, one to be chosen by Landlord, one to be chosen by Tenant, and a
third to be selected by the two first chosen. Said determination shall take into
account, among other relevant considerations, the condition of the Demised
Premises (without regard to any breach by Tenant of its maintenance and repair
obligations hereunder) and any free rent, construction allowances, assumptions
of existing tenant lease obligations, signing bonuses, complimentary special
services and other concessions and inducements being offered in connection with
the leasing of comparable space in the so-called "Financial District" of Boston.
The unanimous written decision of the two first chosen, without selection and
participation of a third appraiser, or otherwise the written decision of a
majority of three appraisers 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 appraiser within ten (10) days following Tenant's
notice of objection as hereinabove provided, and unless such two appraisers
shall have reached a unanimous decision within sixty (60) days following such
ten (10) day period they shall within a further fifteen (15) days elect a third
appraiser and notify Landlord and Tenant thereof. Landlord and Tenant shall each
bear the expense of the appraiser chosen by it and shall equally bear the
expense of the third appraiser (if any). All appraisers chosen or elected
hereunder shall have received the M.A.I. (Member Appraisal Institute)
designation from the American Institute of Real Estate Appraisers and shall have
had at least five (5) years of experience in appraising office space comparable
to the Demised Premises. If, as contemplated herein, the rent payable with
respect to a particular extension period shall not have been determined prior
thereto, then said extension period shall nevertheless commence, and Tenant
shall continue to make payments of rent at the then current rate, subject to
retroactive adjustment in conformity with and within ten (10) days following
such determination. In no event shall the provisions of this paragraph be deemed
to permit a reduction of rent below the amount payable by Tenant immediately
prior to the commencement of a particular extension period or an increase in
rent above the amount set forth in Landlord's Proposal.

      C. If Tenant so requests in writing in the case of a particular extension
period (without thereby committing to exercise the foregoing option) during the
three (3) month period prior to the Exercise Deadline, Landlord shall render
Landlord's Proposal within twenty (20) days following receipt of such request.

      D. The provisions of this Article shall apply to the Seventh Floor Space
only after the Expiration Date with respect to said Space has been extended
through May 31, 2006 pursuant to Section 1.02.C. without rescission by Landlord
of Tenant's option thereunder.


                                   ARTICLE 42

                                     PARKING

      Section 42.01. Tenant shall have the right, throughout the Demised Term
and subject to the provisions hereof, to use twenty-four (24) unreserved parking
spaces (referred to as the "Spaces") in the garage located in the Building
(referred to as the "Garage"). In the event that and at such time as any
rentable area is added to or eliminated from the Demised Premises pursuant to
the provisions of this Lease, the Spaces shall be proportionately increased or
decreased in number (rounding off any fraction to the next lowest integer). The
Spaces may be used only by employees of Tenant working in the Building or, to
the extent that the Spaces are not being so used, by clients or other guests of
Tenant during visits to the Demised Premises. Tenant shall pay for the use of
the Spaces at the prevailing monthly rate established from time to time. Such
payments shall be deemed additional rent for purposes of this Lease. Tenant
shall comply with all rules and regulations promulgated from time to time with
respect to the use of the Garage. To the fullest extent permitted by law,
Landlord shall not be liable for any injury to persons or theft of or damage to
property in the Garage. Tenant may, effective as of the first day of any
calendar month and upon at least sixty (60) days' prior notice to Landlord,
eliminate any Space to which Tenant is then entitled. Any Space so eliminated
need not thereafter again be made available to Tenant pursuant to the provisions
of this Section or otherwise.


                                   ARTICLE 43

                     ADDITIONAL SPACE; RIGHT OF FIRST OFFER

      43.01. For purposes of this Paragraph, the term "Additional Space" shall
mean those areas on the third (3rd), fifth (5th), sixth (6th), seventh (7th),
eighth (8th) and fifteenth (15th) floors of the Building designated as Areas 1
through 7 on the schedule attached hereto as Exhibit E and made a part hereof.
In the event that any Additional Space becomes or is to become vacant and
Landlord desires to lease said Space other than to its then-current occupant (if
any), Landlord shall, so long as this Lease remains in full force and effect
without default by Tenant beyond the applicable grace period, make a written
offer to lease said Space to Tenant, stating the rent that Landlord will accept
as well as all other material terms and conditions of the proposed lease (which
rent and other material terms and conditions shall be generally consistent with
transactions then being entered into by Landlord for comparable space in the
Building). Tenant shall have a right of first refusal to lease said Space by
giving written notice to Landlord accepting such offer within ten (10) days
after such offer was made. If such notice is not so given by Tenant, then
Landlord shall be free to lease said Space to anyone on such terms and
conditions as Landlord may elect, in which case Tenant shall have no further
recourse with respect thereto. In any case in which Tenant shall have waived
said right of first refusal or said right shall have expired, then Tenant shall,
on request of Landlord, execute and deliver in recordable form an instrument
indicating such waiver or expiration, which instrument shall be conclusive in
favor of all persons relying thereon in good faith. Tenant's right of first
refusal hereunder shall not apply to the initial leasing after the date hereof
of Areas 2, 3 and/or 6 designated on Exhibit E.

                                   ARTICLE 44

                           TENANT'S ELIMINATION OPTION

      44.01. Tenant shall have the option, on a single occasion, to eliminate
from the Primary Premises the entire portion thereof located on one or two
floors of the Building (hereinafter referred to as the "Elimination Space"). If
Tenant wishes to exercise such option, Tenant shall so notify Landlord in
writing no later than twelve (12) months prior to the date (hereinafter referred
to as the "Elimination Date") on which such elimination is to become effective.
The Elimination Date shall be either May 31, 1998 or the last day of any
calendar month during the period commencing on January 1, 1999 and ending on
December 31, 2003. On or before the Elimination Date, Tenant shall pay to
Landlord, in addition to all rent and other amounts due under this Lease, the
Elimination Premium, which shall be calculated in accordance with the provisions
of Exhibit F attached hereto and made a part hereof. Tenant shall surrender the
Elimination Space to Landlord on the Elimination Date in the same manner and
with the same force and effect as if such Date were the Expiration Date.
Following the Elimination Date, the Fixed Rent, Tenant's Proportionate Share and
the Electrical Inclusion Factor, as such terms are defined herein with respect
to the Primary Premises, shall each be reduced in the proportion which the area
of the Elimination Space bears to the total area of the Primary Premises
immediately prior to the Elimination Date.

                                   ARTICLE 45

                                  MISCELLANEOUS

      Section 45.01. Landlord shall include Tenant's name and floor location in
any directory maintained by Landlord in the ground floor lobby of the Building.
Landlord shall further affix, in the lobby of any floor on which the Demised
Premises and other rentable area not leased to Tenant are located, Building
standard signage directing visitors to Tenant's offices on said floor.

      Section 45.02. Notwithstanding any other provision of this Lease to the
contrary, if Landlord fails to comply with Landlord's obligations under the
terms of this Lease to furnish services or to operate any Building system
serving the Demised Premises, and if on account of such failure Tenant is able
for a period of ten (10) consecutive business days to conduct none of its
permitted business activities in the Demised Premises, then in such event Fixed
Rent shall equitably abate thereafter so long as such inability continues.

      Section 45.03. Tenant shall not bring or permit to be brought or kept in
or on the Demised Premises or elsewhere in the Building any hazardous wastes or
hazardous substances, as such terms may be defined by any applicable federal,
state or local statute, ordinance, by-law, rule or regulation, including without
limitation the Massachusetts Oil and Hazardous Material Release Prevention and
Response Act (M.G.L. c. 21E), the Comprehensive Environmental Response,
Compensation and Liability Act, as amended (42 U.S.C. ss.ss.9601 et seq.), and
the Resource Conservation and Recovery Act, as amended (42 U.S.C. ss.ss.6901 et
seq.). Except as hereinabove set forth, Tenant shall have no responsibility for
the care, removal, transportation, handling or storage of any such hazardous
wastes or hazardous substances found in, on, under or about the Demised Premises
and Landlord shall be responsible for the proper remediation thereof. The
provisions of this Section shall not prohibit the use of customary,
commercially-produced office supplies so long as the same are stored and handled
in a proper fashion consistent with applicable legal standards.

      Section 45.04. Landlord agrees to indemnify and save Tenant harmless of
and from all loss, cost, liability, damage and expense including, but not
limited to, reasonable counsel fees, penalties and fines, incurred in connection
with or arising from any negligence or wilful misconduct of Landlord or any
contractors, agents, servants or employees of Landlord occurring during the
Demised Term and any claims by any persons by reason of personal injury or
property damage resulting therefrom. If any action or proceeding shall be
brought against Tenant based upon any such cause, Tenant shall so notify
Landlord forthwith, and if Landlord, upon such notice, shall cause such action
or proceeding to be defended at Landlord's expense by counsel acting for
Landlord's insurance carriers in connection with such defense or by other
counsel reasonably satisfactory to Tenant, without any disclaimer of liability
by Landlord or such insurance carriers in connection with such claim, Landlord
shall not be required to indemnify Tenant for counsel fees in connection with
such action or proceeding.

      Section 45.05. Whenever any provision hereof requires the consent or
approval of either party, such party may, unless such provision expressly
stipulates otherwise, withhold such consent or approval in its sole and absolute
discretion. Whenever any provision hereof stipulates that the consent or
approval of either party shall not be unreasonably withheld and/or delayed, such
provision shall be construed to prohibit the granting of such consent or
approval subject to unreasonable conditions.


                                   ARTICLE 46

                                 NOTICE OF LEASE

      Section 46.01. Neither party shall record this Lease in any Registry of
Deeds or Registry District, provided however that either party shall at the
request of the other execute and deliver a recordable notice of this Lease in
the form prescribed by applicable law.


                                   ARTICLE 47

                          TELECOMMUNICATIONS EQUIPMENT

      Section 47.01. To the extent that space is available for such purpose,
Landlord will allow Tenant, subject to the same terms and conditions (including
without limitation the payment of license fees) afforded to other tenants, to
install, maintain and connect to the Demised Premises telecommunications
equipment on the roof of the Building. In no event shall the provisions of this
Section be construed as an option, right of first refusal or other entitlement
in Tenant's favor.

                                   ARTICLE 48

                            TENANT'S EXPANSION OPTION

      Section 48.01. So long as this Lease remains in full force and effect
without default by Tenant beyond the applicable grace period, Tenant may add to
the Demised Premises, pursuant and subject to the provisions hereof, that
portion of the fifteenth (15th) floor of the Building shown on the plan attached
hereto as Exhibit G and made a part hereof (referred to as the "Option Space").
The rentable area of the Option Space is agreed to consist of 10,208 square
feet. The foregoing option may be exercised by notice given by Tenant to
Landlord on or before May 1, 1997. Except as otherwise set forth herein, all
terms, covenants and conditions of the Lease generally applicable to the Demised
Premises shall be deemed to apply to the Option Space. The provisions of Section
1.02.D and Schedule A relative to the Expansion Area shall likewise pertain to
the Option Space, except that the Commencement Date applicable to the Option
Space shall not occur prior to October 1, 1997. The Option Space is currently
leased to Jager, Smith, Stetler & Arata, P.C., a Massachusetts professional
corporation. Landlord shall, on or before April 1, 1997, notify Tenant of the
date on which the term of said lease, as the same may hereafter be extended, is
scheduled to expire (referred to as the "Current Lease Expiration Date"). In no
event may the Current Lease Expiration Date be earlier than June 30, 1997 or
later than January 31, 1998. Tenant shall pay Fixed Rent to Landlord pursuant to
Section 1.03 with respect to the Option Space in accordance with the following
schedule:

      With respect to the         Fixed Rent shall be payable
      following period:             at the annual rate of:
      -------------------         ---------------------------
  Through May 31, 2001               $306,240.00 ($30 psf)
  June 1, 2001 - May 31, 2006        $331,760.04 ($32.50 psf)

As used with respect to the Option Space, the following Lease terms shall be
defined as hereinafter set forth:

      Electrical Inclusion Factor:        $10,208
      Tenant's Proportionate Share:       0.946%
      Construction Deadline:              The 243rd day following the
                                          Plan Approval Date
      Delay Credit:                       $1,259
      Landlord's Construction
        Contribution:                     $326,656
      Plan Approval Date:                 The thirtieth (30th) day prior to the
                                          Current Lease Expiration Date


      IN WITNESS WHEREOF, Landlord and Tenant have respectively signed and
sealed this Lease as of the day and year first above written.

Witness:                      DEWEY SQUARE TOWER ASSOCIATES
                              By:  Rose Associates of Massachusetts,
                                     Inc., Agent


                              By
                                          Landlord

                                          (CORP. SEAL)


Witness/                      COLONIAL MANAGEMENT ASSOCIATES, INC.
Attest:

                              By

                              Its ________________________________
                                    title (duly-authorized)

                                          Tenant

                                          (CORP. SEAL)

<PAGE>



                                    EXHIBIT A

                 [PLANS SHOWING LOCATION OF PORTIONS OF DEMISED
                 PREMISES CONSISTING OF LESS THAN ENTIRE FLOOR]



<PAGE>



                                    EXHIBIT B

                      ACKNOWLEDGEMENT OF COMMENCEMENT DATE


      Reference is made to the lease dated May 31, 1996 between DEWEY SQUARE
TOWER ASSOCIATES, a Massachusetts partnership, and COLONIAL MANAGEMENT
ASSOCIATES, INC., a California corporation, with respect to certain premises
contained in the building known as One Financial Center, Boston, Massachusetts.
The parties hereby acknowledge that the Commencement Date applicable to the
Expansion Area (as such terms are defined in said lease) occurred on ___________
__, 19__. In all other respects, said lease is hereby ratified and confirmed.

      IN WITNESS WHEREOF, the parties have executed this instrument as of the
___ day of ____________, 19__.


                              DEWEY SQUARE TOWER ASSOCIATES
                              By  Rose Associates of Massachusetts, Inc., Agent

                                   By____________________________


                              COLONIAL MANAGEMENT ASSOCIATES, INC.


                              By____________________________

                              Its____________________________
                                   title (duly-authorized)


<PAGE>


                                    EXHIBIT C


                      MORTGAGEE'S NON-DISTURBANCE AGREEMENT
                                       AND
                          LESSEE'S AGREEMENT TO ATTORN


      THIS AGREEMENT, made as of this ____ day of ___________, 199_, by and
between METROPOLITAN LIFE INSURANCE COMPANY, a corporation organized and
existing under the laws of the State of New York, having its principal place of
business and a mailing address at One Madison Avenue, New York, New York 10010
(hereinafter referred to as "Mortgagee") and ______________________, a
______________ organized and existing under the laws of the State of
____________, having a place of business and a mailing address at
_________________________________ (hereinafter referred to as "Lessee").

      WHEREAS, Lessee has entered into a certain lease, dated _______________,
between Dewey Square Tower Associates, as landlord, and Lessee, as tenant,
covering certain space (hereinafter referred to as the "Demised Premises"), in
the building located at One Financial Center, Boston, Massachusetts, as further
described in the lease (the said lease being hereinafter referred to as the
"Lease"); and

      WHEREAS, Mortgagee is the holder of a certain Mortgage and Consolidation
Agreement dated February 26, 1988, recorded with Suffolk County Registry of
Deeds at Book 14513, Page 1 and filed with the Suffolk Registry District of the
Land Court as Document No. 435451, as from time to time amended, and including
all prior mortgage liens consolidated therein, which covers the building

<PAGE>

and land of which the Demised Premises form a part (hereinafter referred to as
the "Mortgage"); and 

      WHEREAS, Lessee has requested that Mortgagee agree not to disturb Lessee's
possessory rights in the Demised Premises in the event Mortgagee should
foreclose the Mortgage provided the Lessee: (i) is not then in default under the
Lease beyond any applicable notice and cure period; (ii) complies with this
Agreement; and (iii) attorns to Mortgagee or the purchaser at the foreclosure
sale; and 

      WHEREAS, Mortgagee is willing to accommodate Lessee and to so agree
thereto on the terms and conditions hereinafter provided; 

      NOW, THEREFORE, in consideration of the premises, the foregoing recitals,
the mutual covenants contained herein and TEN ($10.00) DOLLARS and other good
and valuable consideration each to the other in hand paid, receipt of which is
hereby acknowledged, Mortgagee and Lessee, intending to be legally bound, hereby
agree as follows:

      The Lease is and shall be subject and subordinate in all respects to the
Mortgage and to any renewal, modification, replacement or extension of the same
and to any subsequent mortgage(s) with which the Mortgage may be spread and
consolidated.

      That, provided Lessee complies with this Agreement and is not in default
under the terms of the Lease in the payment of rent or additional rent or the
performance of any of the terms, conditions, covenants, clauses or agreements on
its part to be performed under the Lease, beyond any applicable notice and cure
period, as of the date Mortgagee files a lis pendens in, or otherwise commences
a foreclosure action, or at any time thereafter, no default under the Mortgage,
as modified, extended, increased, spread or consolidated, and no proceeding to
foreclose the same, will disturb Lessee's possession under the Lease and the
Lease will not be affected or cut off thereby (except to the extent that
Lessee's right to receive or set off any moneys or obligations owed or to be
performed by Mortgagee's predecessor(s) in title shall not be enforceable
thereafter against Mortgagee or any subsequent owner of the real property of
which the Demised Premises form a part) and notwithstanding any such foreclosure
or other acquisition of the real property of which the Demised Premises form a
part by Mortgagee, the Lease will be recognized as a direct lease from Mortgagee
or any other party acquiring the real property of which the Demised Premises
form a part upon the foreclosure sale on the same terms and conditions as set
forth in the Lease, except that Mortgagee, or any subsequent owner of the real
property of which the Demised Premises form a part, shall not: (a) be liable for
any previous act or omission of landlord under the Lease; (b) be subject to any
offset which shall theretofore have accrued to Lessee against landlord; (c) have
any obligation with respect to any security deposited under the Lease unless
such security has been physically delivered to Mortgagee or any such subsequent
owner; or (d) be bound by any previous modification of the Lease or by any
previous prepayment of fixed rent for a period greater than (1) month, unless
such modification or prepayment shall have been expressly approved in writing by
Mortgagee.

      Any provision of this Agreement to the contrary notwithstanding, Mortgagee
shall have no obligation, nor incur any liability, with respect to the erection
and completion of the building in which the Demised Premises are located or for
completion of the Demised Premises or any improvements for Lessee's use and
occupancy. Lessee certifies that the term of the Lease has commenced and that
the Lease is presently in full force and effect and unmodified; that Lessee has
accepted possession of the Demises Premises and that any improvements required
by the terms of the Lease have either been completed to the satisfaction of
Lessee or provisions, satisfactory to Lessee, are contained in the Lease to
assure the completion thereof; that no rent under the Lease has been paid more
than one (1) month in advance of its due date; that Lessee, as of the date
hereof, has no charge, lien or claim of offset under the Lease, or otherwise,
against the rents or other charges due or to become due thereunder.

      That if Mortgagee elects to accept from the then Mortgagor a deed in lieu
of foreclosure, Lessee's right to receive or set off any moneys or obligations
owed or to be performed by the then landlord shall not be enforceable thereafter
against Mortgagee or any subsequent owner of the real property of which the
Demised Premises form a part.

      That Lessee will, if requested by Mortgagee, or any subsequent owner of
the real property of which the Demised Premises form a part, execute a written
agreement whereunder Lessee: (1) attorns to, and agrees to recognize as landlord
under the Lease, Mortgagee or any such subsequent owner; (ii) affirms Lessee's
obligations under the Lease; and (iii) agrees to pay all rentals and charges
then due or to become due as they become due to Mortgagee or such subsequent
owner, in accordance with the terms and provisions of the Lease. Lessee, from
and after the date hereof, shall send a copy of any notice or statement under
the Lease to Mortgagee at the same time such notice or statement is sent to the
landlord under the Lease. 

      Lessee hereby agrees that, from and after the date hereof, in the event of
any act or omission by landlord under the Lease (other than any such act or
omission which is not capable of being remedied by landlord under the Lease
within a reasonable period) which would give Lessee the right, either
immediately or after the lapse of a period of time, to terminate the Lease, or
to claim a partial or total eviction, Lessee will not exercise any such right:
(i) until it has given written notice of such act or omission to Mortgagee by
delivering such notice of such act or omission, by certified or registered mail,
return receipt requested, or by a nationally recognized air courier which
delivers by 10:30 a.m., local time of the recipient thereof and which provides
written evidence of delivery thereof (such as, by way of illustration and not
limitation, Federal Express), addressed to Mortgagee, at Mortgagee's address as
given herein (Attention: Senior Vice-President, Real Estate Investments), or at
the last address of Mortgagee, furnished to Lessee in writing; and (ii) until a
reasonable period of time for remedying such act or omission following the
giving of such notice and the time within which Mortgagee may be entitled
pursuant to the Mortgage to remedy the same, shall have elapsed; provided,
Mortgagee, at its option, shall, following its receipt of such notice, has
elected to commence and continue to remedy such act or omission or to cause the
same to be remedied.

      Lessee will neither offer nor make prepayment of rent (for a period in
excess of one month) nor further change the terms, covenants, conditions and
agreements of the Lease in any manner without the express consent in writing of
Mortgagee.

      Nothing contained in this Agreement shall in any way impair or affect the
lien created by the Mortgage, except as specifically set forth herein. 

      No modification, amendment, waiver or release of any provision of this
Agreement or of any right, obligation, claim or cause of action arising
hereunder shall be valid or binding, for any purpose whatsoever, unless in
writing and duly executed by the party against whom the same is sought to be
asserted.

      This Agreement shall inure to the benefit of the parties hereto, their
successors and assigns; provided, however, that in the event of the assignment
or transfer of the interest of Mortgagee, all obligations and liabilities of
Mortgagee under this Agreement shall terminate, and thereupon all such
obligations and liabilities shall be the responsibility of the party to whom
Mortgagee's interest is assigned or transferred; and provided further the
interest of Lessee under this Agreement may not be assigned or transferred.


      Lessee acknowledged and agrees that this Agreement fully complies with,
and satisfies in all respects, any condition or requirement in the Lease
relating to the obtainment and granting of a non-disturbance agreement.

      Lessee acknowledges that it has notice that the Lease and the rent and all
other sums due thereunder have been assigned to Mortgagee as part of the
security for the note secured by the Mortgage. In the event that Mortgagee
notifies Lessee of a default under the Mortgage and demands that Lessee pay to
Mortgagee Lessee's rent and all other sums due under the Lease, Lessee agrees
that it will, and Mortgagor, as landlord under the Lease, hereby authorizes and
directs Lessee to honor such demand and pay Lessee's rent and all other sums due
under the Lease directly to Mortgagee.

      Mortgagee shall have no responsibility to provide any additional space for
which Lessee has any option or right under the Lease unless Mortgagee, at its
option, elects to provide the same. Lessee hereby releases Mortgagee from any
obligation to provide the same, if any, and Lessee acknowledges and agrees that
it shall have no right to cancel the Lease nor have any claim against Mortgagee
as a result of the failure to provide any such option space.

      Lessee represents and covenants that it has no right or option of any
nature whatsoever, whether pursuant to the Lease or otherwise, to purchase the
Demised Premises or the real property of which the Demised Premises form a part,
or any portion thereof, or any interest therein, and to the extent that Lessee
has had, or hereafter acquires any such right or option, the same is hereby
acknowledged to be subject and subordinate in all respects to the Mortgage and
is hereby waived and released as against Mortgagee.

      Mortgagee shall have no obligation, nor incur any liability, with respect
to any warranties of any nature whatsoever, whether pursuant to the Lease or
otherwise, including, without limitation, any warranties respecting use,
compliance with zoning, lessor's title, lessor's authority, habitability, and/or
fitness for purpose or possession.

      Anything herein or in the Lease to the contrary notwithstanding, in the
event that Mortgagee shall acquire title to the Demised Premises or the real
property of which the Demised Premises form a part, Lessee agrees that Mortgagee
shall have no obligation, nor incur any liability, beyond Mortgagee's then
interest, if any, in the Demised Premises or the real property of which the
Demised Premises form a part. Lessee further agrees to look exclusively to such
interest of Mortgagee, if any, in the Demised Premises or the real property of
which the Demised Premises form a part, for the payment and discharge of any
obligations imposed upon Mortgagee hereunder or under the Lease and Mortgagee is
hereby released or relieved of any other obligations hereunder and under the
Lease. Lessee also agrees that with respect to any money judgment which may be
obtained or secured by Lessee against Mortgagee, Lessee shall look solely to the
estate or interest owned by Mortgagee in the Demised Premises or the real
property of which the Demised Premises form a part, or any portion thereof, or
interest therein, and Lessee will not collect, nor attempt to collect, any such
judgment out of any other assets of Mortgagee.

      IN WITNESS WHEREOF, the parties hereto have respectively executed, or
caused to be executed by their respective duly authorized representative(s),
this Agreement as of the day and year first above written. MORTGAGEE:

ATTEST/WITNESS:                   METROPOLITAN LIFE INSURANCE
                                        COMPANY
                                
___________________________       By_______________________________
                                
                                        Its______________________________
                                              title (duly-authorized)
                                
                                
                                        LESSEE:
                                
ATTEST/WITNESS:                   ________________________________
                                
____________________________      By______________________________
                                
                                  Its_____________________________
                                       title (duly-authorized)
                            
                                STATE OF NEW YORK

New York, ss:                             _____________ __, 199__

      Then personally appeared the above-named ____________________ and
acknowledged the foregoing instrument to be his free act and deed and the free
act and deed of Metropolitan Life Insurance Company, before me

                                    _____________________________

                                    Notary Public
                                    My Commission Expires:

                          STATE OF ___________________

County of _____________, ss:              _____________ __, 199__

      Then personally appeared the above-named _____________________ and
acknowledged the foregoing instrument to be his free act and deed and the free
act and deed of ________________________, before me

                                    ____________________________

                                    Notary Public
                                    My Commission Expires:

<PAGE>

Dewey Square Tower Associates, as landlord under the Lease and as Mortgagor
under the Mortgage, agrees for itself and its successors and assigns, that: (i)
the within Agreement does not (a) constitute a waiver by Mortgagee of any of its
rights under the Mortgage, and/or (b) in any way release Mortgagor from its
obligation to comply with the terms, provisions, conditions, covenants,
agreements and clauses of the Mortgage; (ii) the provisions of the Mortgage
remain in full force and effect and must be complied with by Mortgagor; and
(iii) in the event that Mortgagee notifies Lessee of a default under the
Mortgage and demands that Lessee pay to Mortgagee its rent and all other sums
due under the Lease, such demand by Mortgagee on Lessee shall be sufficient
warrant to Lessee to pay its rent and all other sums due under the Lease to
Mortgagee without necessity for consent by Mortgagor or any further evidence of
a default under the Mortgage and notwithstanding any claim by Mortgagor to the
contrary, and Lessee can, and Mortgagor hereby irrevocably authorizes and
directs Lessee to, pay its rent and all other sums due under the lease directly
to Mortgagee, as provided in the within Agreement, until further notice by
Mortgagee authorizing Lessee to resume rent payments to Mortgagor. Mortgagor, by
its execution hereof, hereby expressly acknowledged and agrees that Lessee, in
reliance upon Mortgagor's authorization and direction, as herein set forth, will
not be deemed, nor declared, in default under the Lease, nor shall Mortgagor
make or have any claim against Lessee for any amounts paid by Lessee to
Mortgagee pursuant hereto.

                                   MORTGAGOR/LANDLORD:

ATTEST/WITNESS:                    DEWEY SQUARE TOWER ASSOCIATES
                                   By Rose Associates of Massachusetts, Inc.,
agent

____________________________       By____________________________


                                STATE OF NEW YORK

New York, ss:                             ______________ __, 199__

      Then personally appeared the above-named Daniel Rose and acknowledged the
foregoing instrument to be his free act and deed and the free act and deed of
Rose Associates of Massachusetts, Inc. as agent for Dewey Square Tower
Associates, before me

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

                                    Notary Public
                                    My Commission Expires:

<PAGE>

                                    EXHIBIT D

                        CONSTRUCTION MANAGEMENT AGREEMENT


      This Agreement is made as of the _____ day of ___________, 19__, between
the Tenant:
__________________________________________ ("Tenant"), and the Construction
Manager:  Rose Associates of Massachusetts, Inc. ("Manager") for the following
Project:
_______________________________________________________________________________

_______________________________________________________________________________

I.     Scope of Services:  Manager shall provide the following services:

A.    Pre-Construction Services
      -------------------------

1.                 Manager shall review information furnished by
      Tenant to ascertain the requirements of the Project and shall
      arrive at a mutual understanding of such requirements with
      Tenant.

1.                 Manager shall provide an evaluation of Tenant's
      schedule and construction budget requirements, each in terms of
      the other.

1.                 Manager shall review design documents during
      their development and advise on selection of materials,
      building systems and equipment, and methods of Project
      delivery.

1.                 Manager shall advise on the division of the
      Project into individual contracts for various categories of
      work, including the method to be used for selecting
      contractors and awarding contracts.

1.                 Manager shall submit a list of prospective bidders for
      Tenant's approval.

1.                 Manager shall issue bidding documents to bidders and
      conduct pre-bid conferences with prospective bidders.

1.                 Manager shall receive bids, prepare bid analyses and
      make recommendations to Tenant for Tenant's award of contracts or
      rejection of bids.

1.                 Manager shall assist Tenant in preparing construction
      contracts and advise Tenant on the acceptability of subcontractors
      and material suppliers proposed by contractors.

<PAGE>

1.                 Manager shall assist Tenant in obtaining building permits,
      except for permits required to be obtained directly by the various
      contractors. Manager shall assist Tenant in connection with Tenant's
      responsibility for filing documents required for the approvals of
      governmental authorities having jurisdiction over the Project.

A.     Construction Management Services
       --------------------------------

1.                 Manager shall provide administration of the contracts
      for construction in cooperation with Tenant, including attending
      meetings, endeavoring to obtain satisfactory performance from each
      of the contractors, and implementing procedures for the review and
      processing of applications by contractors for progress and final
      payments.

1.                 Manager shall determine in general that the work of
      each contractor is being performed in accordance with the
      requirements of the contract documents, endeavoring to guard
      against defects and deficiencies.

1.                 When Manager considers each contractor's work
      substantially complete, Manager shall, jointly with the
      contractor, prepare for Tenant a list of incomplete or
      unsatisfactory items and a schedule for their completion.

1.    Manager shall secure and transmit to Tenant warranties and
      similar submittals required by the contract documents.

I.    Basis of Compensation to Manager:  Tenant shall compensate
      Manager for its services hereunder as follows:

Manager shall submit invoices to Tenant from time to time and payment
shall be made within fifteen (15) days thereafter.

I.    Tenant Responsibilities: Tenant shall do the following in a timely manner
so as not to delay the services to be provided by Manager:

A.    Designate in writing a person to act as Tenant's representative with
respect to the services to be rendered under this Agreement. Such person shall
have complete authority to transmit instructions, receive information, and
interpret and define Tenant's policies and decisions with respect to Manager's
services for the Project.

A.    Provide all criteria and full information and documentation requested by
Manager or necessary for the performance of Manager's Services.

A.    Give prompt written notice to Manager whenever Tenant observes or
otherwise becomes aware of any circumstance that affects the scope or timing
of Manager's services.

A.    Establish and update an overall budget for the Project based on
consultation with Manager, which shall include construction cost, Tenant's
other costs and reasonable contingencies.

I.    Independent Contractor Status:  Manager shall be a fully
independent contractor in performing its services hereunder and shall not
act as an agent or employee of Tenant.

I. Changed Conditions and Additional Services: If occurrences or discoveries
not known, anticipated, or contemplated by the parties arise during the
course of Manager's services, including but not limited to delay, which, in
Manager's judgment, require additional work outside the scope of such services,
or if Tenant, at any time, by written order, makes changes within the general
scope of this Agreement in the services to be performed by Manager causing an
increase in Manager's cost, or time required for performance, of any services
under this Agreement, an equitable adjustment of Contractor's compensation shall
be made, and this Agreement shall be modified in writing accordingly.

I.    Cost Estimates: Since Manager has no control over the cost of labor,
materials, equipment or services furnished by others, or over competitive
bidding or market conditions, any opinion of construction cost provided for
herein is to be made on the basis of Manager's experience and qualifications and
represents Manager's best judgment; but Manager cannot and does not guarantee
that proposals, bids or actual construction costs will not vary from estimates
of probable cost given by Manager.

I.   Termination: Either party shall have the right to terminate this
agreement with respect to the Project for cause if the other party commits a
material breach of this Agreement and fails to cure such breach within the time
period hereinafter described. A Notice of Default, containing specific reasons
for termination, shall be sent to the defaulting party. Termination shall not be
effective if the breach has been remedied within ten (10) days after the
defaulting party's receipt of the Notice of Default or such later date specified
in the Notice of Default, or, if the defaulting party has begun to cure such
default within such period and diligently prosecutes curing such default to
completion (except that such provision shall not apply to Tenant's failure to
pay an invoice). In the event of termination for cause, the parties shall have
their remedies at law as to any other rights and obligations between them,
subject to the other terms and conditions of this Agreement.

I.    Limitation of Liability: To the fullest extent permitted by law, the
total liability, in the aggregate, of Manager and Manager's officers, directors,
employees, agents, and independent professional associates and consultants, or
any of them, to Tenant and anyone claiming by, through or under Tenant, for any
and all injuries, claims, losses, expenses, or damages whatsoever arising out of
or in any way related to Manager's services, the Project or this Agreement shall
not exceed the total compensation received by Manager hereunder.

I.     Notices:  Any notice required or permitted hereunder shall be in writing
and shall be sent by registered or certified mail addressed to Manager at
One Financial Center, Boston, Massachusetts 02111 or to Tenant at

_____________________________ __________________________.  Either party may
change its respective address by notice to the other.

I.     Relationship to Landlord:  The Project site consists of premises
leased by Tenant from Dewey Square Tower Associates ("Landlord").  In no
or omissions or the performance of Manager's duties hereunder, nor shall
the provisions of this Agreement be deemed to limit Landlord's right to
enforce the provisions of said lease.

I.     Applicable State Law:  This Agreement shall be governed and
construed in accordance with the laws of the Commonwealth of Massachusetts.

 I.    Waiver:  A waiver of any breach or omission hereunder shall not
constitute a waiver of any subsequent breach or omission unless specifically
agreed to in writing by the parties.

      WITNESS the execution hereof under seal as of the day and year first above
written.


ROSE ASSOCIATES OF
MASSACHUSETTS, INC.


By                                        By__________________________________


                                          Its_________________________________
                                                 title (duly authorized)



<PAGE>



                                    EXHIBIT E

                                ADDITIONAL SPACE


The various Areas included in the Additional Space and the agreed rentable area
thereof are as follows:

1     Entire third (3rd) floor (23,717 square feet)
2     Entire fifth (5th) floor (23,847 square feet)
3     Entire sixth (6th) floor (23,377 square feet)
4     Portion of seventh (7th) floor (17,359 square feet)
5     Entire eighth (8th) floor (23,847 square feet)
6     Portion of fifteenth (15th) floor (8,153 square feet)
7     Portion of fifteenth (15th) floor (5,802 square feet)

The location of any such Area consisting of less than an entire floor is shown
on the plans attached hereto as Exhibit E-1 and made a part hereof.


<PAGE>



                                    EXHIBIT F

                       CALCULATION OF ELIMINATION PREMIUM

The Elimination Premium shall be the amount calculated by Multiplying the
rentable area of the Elimination Space times the Elimination Factor in effect
when the Elimination Date occurs. With respect to the period ending on January
31, 1999, the Elimination Factor shall be $37.50. The Elimination Factor shall
be reduced by 31.25 cents effective as of the first day of February, 1999 and
each succeeding calendar month through and including January 2003 such that the
Elimination Factor will be $22.50 effective as of January 1, 2003 and will
thereafter be subject to no further reduction.

<PAGE>


                                    EXHIBIT G

                           [PLAN SHOWING OPTION SPACE]

<PAGE>





                                   SCHEDULE A

                             LANDLORD'S CONSTRUCTION


I.          A.    Tenant shall submit to Landlord a plan ("Tenant's Plan") for
         the renovation of the Expansion Area, including without limitation
         selection of wall coverings, paint colors and carpeting (the "Work").
         Tenant's Plan shall also include as many requests for pricing of 
         alternatives as Tenant wishes to consider prior to authorizing
         Landlord to commence the work pursuant to Paragraph III below and
         shall designate any additional contractors from whom Tenant wishes
         Landlord to solicit proposals in addition to contractors designated by
         Landlord (all of which contractors, whether designated by Landlord or
         Tenant, which are deemed to be qualified and financially capable of 
         completing the work in the reasonable judgment of Landlord, are
         hereinafter referred to as "Designated Contractors").  Landlord
         agrees to cooperate with Tenant and Tenant's agents, employees
         and contractors in all respects during the development of Tenant's
         Plan and shall make available to Tenant, at Tenant's cost, promptly
         after request therefor, copies of all plans and Building contract
         specifications directly related thereto.

            B. Tenant's Plan shall be subject to Landlord's approval in
         accordance with the criteria set forth in Article 4 of this Lease. It
         shall be Tenant's responsibility to assure that Tenant's Plan has been
         so approved on or before January 24, 1997 (the "Plan Approval Date").
         Such approval shall be deemed to have been granted unless Landlord
         notifies Tenant to the contrary within five (5) days after the receipt
         of Tenant's written request for such approval so long as such request
         expressly and conspicuously recites the effect of Landlord's failure to
         respond thereto as aforesaid.

II.      Upon Landlord's approval of Tenant's Plan, Landlord will promptly
         solicit proposals from all Designated Contractors for the Work,
           including such alternative prices as are specified on such Plan.
         Based upon proposals submitted to Landlord by such Contractors,
         Landlord shall submit to Tenant Landlord's price to construct the Work,
         which price shall be based upon the proposal submitted by the
         Designated Contractor which submitted the lowest total price for such
         Work, plus an amount equal to three percent (3%) of such Contractor's
         price as a construction management fee (hereinafter collectively
         referred to in each such case as "Landlord's Preliminary Price").
         Landlord's Preliminary Price, and those prices for alternates specified
         on Tenant's Plan, shall be submitted to Tenant for review and approval
         within ten (10) days following receipt by Landlord of all proposals for
         the Work, together with a copy of each Designated Contractor's
         proposal.

III.     Tenant shall have ten (10) days in which to (a) review such material,
         (b) either (i) approve such Landlord's Preliminary Price, or (ii)
         approve some alternative combination of work and the price therefor
         (including the construction management fee computed pursuant to
         Paragraph II) based on the proposal submitted by the Designated
         Contractor selected by Landlord or another Designated Contractor whom
         Tenant prefers to select, and (c) and authorize Landlord to commence
         the Work. Landlord's Preliminary Price, as adjusted pursuant to the
         preceding sentence, is hereinafter referred to as "Landlord's
         Construction Price".



<PAGE>



IV.      Landlord agrees to contribute towards the cost of the Work an
         amount not to exceed $307,936 ("Landlord's Construction Contribution").
         Landlord's Construction Contribution shall be applied against the
         statements rendered by Landlord to Tenant pursuant to the provisions
         hereof until such Landlord's Construction Contribution shall have been
         exhausted. Any unused balance of Landlord's Construction Contribution
         shall be applied as a credit on account of installments of Fixed Rent
         becoming due under this Lease or may, at Tenant's option, be used to
         reimburse costs (which shall be evidenced by receipts, invoices and
         other supporting material reasonably satisfactory to Landlord) incurred
         by Tenant in connection with the preparation of Tenant's Plan and the
         leasing of the Expansion Area.

 V. A.   Landlord shall perform the Work in a good and workmanlike
         manner conforming to applicable law and shall use diligent efforts to
         substantially complete such Work on or before the Construction
         Deadline. Tenant shall be deemed to have agreed that Landlord has
         satisfactorily performed all of its obligations with respect to the
         Work unless Tenant notifies Landlord to the contrary, specifying the
         respects in which the Work is incomplete or defective, within one
         hundred eighty (180) days following notice from Landlord that the Work
         has been substantially completed. Landlord shall correct any incomplete
         or defective items of Work of which Tenant has notified Landlord as
         aforesaid promptly after receipt of such notice. In addition, Landlord
         shall (i) at Landlord's expense, use reasonable efforts to enforce on
         Tenant's behalf any warranties received by Landlord in connection with
         the Work and (ii) remain responsible throughout the Demised Term for
         any repairs which Landlord is otherwise obligated to perform pursuant
         to the provisions of this Lease.

            B. After application of Landlord's Construction Contribution, Tenant
         shall pay to Landlord from time to time as the Work progresses and
         within thirty (30) days next following the rendition of a statement by
         Landlord to Tenant, sums equal to the remainder of Landlord's
         Construction Price.

VI.      Tenant may from time to time propose revisions to Tenant's Plan. Such
         revisions shall be subject to Landlord's approval in accordance with
         the criteria set forth in Article 4 of this Lease, provided however
         that Landlord shall in no event be obligated to approve any such
         revision which might tend to delay completion of the Work. To the
         extent that Tenant's Plan is revised hereunder so as to result in any
         increase or decrease in Landlord's Construction Price, the amount of
         such increase shall be added to and the amount of such decrease shall
         be subtracted from the amount which Tenant is obligated to contribute
         pursuant to Paragraph V.B.

VIII.    Landlord shall be authorized to rely, in connection with any approval
         or other action to be taken on behalf of Tenant pursuant to this
         Schedule, only on instructions given by Mark W. Ahern, Manager of
         Corporate Services, or such other person whom Tenant may from time to
         time designate by written notice to Landlord.

IX.      Landlord shall, if so requested in writing by Tenant, make available
         for inspection by Tenant such data in Landlord's possession as may be
         reasonably necessary to enable Tenant to verify the computation of any
         payment due from Tenant hereunder.