<PAGE>
                                                                    EXHIBIT 10.5

                                 LEASE AGREEMENT

                                     BETWEEN

                  RAK OLD SOUTH ASSOCIATES LIMITED PARTNERSHIP

                                       AND

                              COLOR KINETICS, INC.

                                   DATED AS OF

                                 APRIL 25, 2000

                               PREMISES LOCATED AT

                                 10 MILK STREET

                              BOSTON, MASSACHUSETTS

<PAGE>

                       SUMMARY OF BASIC LEASE INFORMATION

         This Summary is hereby incorporated into and made a part of the
attached Lease Agreement (this Summary and the Lease Agreement to be known
collectively as the "Lease") which pertains to the office building located at 10
Milk Street, Boston, Massachusetts. Each reference in the Lease Agreement to any
term of this Summary shall have the meaning as set forth in this Summary for
such term. In the event of a conflict between the terms of this Summary and the
Lease Agreement, the terms of the Lease Agreement shall prevail.

<TABLE>
<CAPTION>
   TERMS OF THE LEASE                                            DESCRIPTION
   ------------------                                            -----------
<S>                                        <C>
1. Date of the Lease                       April 25, 2000

2. LANDLORD                                RAK Old South Associates Limited Partnership

3. Address of Landlord                     c/o RAK
                                           140 West 57th Street
                                           New York, New York 10019

4. TENANT                                  Color Kinetics,Inc.

5. Address of Tenant                       50 Milk Street
                                           Boston, MA 02108
                                           (prior to Commencement Date)

                                           and

                                           10 Milk Street
                                           Boston, Massachusetts 02108
                                           (after Commencement Date)

6. Leased Premises                         Eleventh Floor at 10 Milk Street, Boston,
(Articles 1 and 32)                        Massachusetts, consisting of approximately 20,271 square feet
                                           of rentable area

                                           Option to expand onto tenth floor as set forth in Article 32

                                           Right of first offer on any contiguous space as set forth in
                                           Article 32

7. Term (Article 2)                        Seven Years with a Commencement Date and
                                           Expiration Date as defined in Section 2.1 (unless
                                           extended or earlier terminated)

                                           Estimated Commencement Date of August 1, 2000

                                           One five year option to extend subject to twelve
</TABLE>

                                     - i -

<PAGE>

<TABLE>
<S>                                        <C>
                                           month's prior notice

8. Basic Annual Rent (Article 3)           For Lease Years 1-3, $831,111.00 ($41.00 per rentable square
                                           foot)

                                           For Lease Years 4-7, $851,382.00 ($42.00 per rentable square
                                           foot)

9. Tax Escalation (Article 4)              Tenant's Tax Share 10.02% (to be recalculated if Tenant
                                           exercises option on tenth floor)

10. Expense Escalation (Article 5)         Tenant's Expense Share 10.90% (to be recalculated if Tenant
                                           exercises option on tenth floor)

11. Security Deposit (Articles 7 and 32)   $1,000,000.00 Irrevocable Letter of Credit (with paydown
                                           provision)

                                           Additional $1,000,000.00 (can be reduced to $500,000.00 upon certain
                                           condition) if expansion option exercised for tenth floor

12. Permitted Uses (Article 9)             General Office Purposes and uses accessory thereto, including
                                           kitchen with dishwasher, refrigerator, icemaker, and
                                           microwave, and prototype creation room.

13. Brokers (Section 33.11)                Cushman & Wakefield of Massachusetts, Inc. and Jones Lang
                                           LaSalle
</TABLE>

                                     - ii -

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                PAGE
<S>                                                                                                             <C>
SUMMARY OF BASIC LEASE INFORMATION...........................................................................     i

TABLE OF DEFINITIONS.........................................................................................     v

1.       LEASED PREMISES.....................................................................................     1

2.       TERM................................................................................................     1

3.       BASIC ANNUAL RENT...................................................................................     4

4.       ADDITIONAL RENT - TAX ESCALATION....................................................................     4

5.       ADDITIONAL RENT - OPERATING EXPENSE ESCALATION......................................................     5

6.       TAX ON TENANT'S PROPERTY; OTHER TAXES...............................................................     7

7.       SECURITY DEPOSIT....................................................................................     7

8.       LATE PAYMENTS.......................................................................................     9

9.       USE OF LEASED PREMISES..............................................................................     9

10.      UTILITIES AND SERVICES..............................................................................     9

11.      CONDITION OF PREMISES..............................................................................     10

12.      ALTERATIONS OR ADDITIONS...........................................................................     11

13.      REPAIRS AND MAINTENANCE............................................................................     13

14.      LIENS..............................................................................................     13

15.      DAMAGE TO BUILDING OR LEASED PREMISES..............................................................     13

16.      EMINENT DOMAIN.....................................................................................     15

17.      DEFAULT............................................................................................     15

18.      REMEDIES UPON DEFAULT...............................................................................    16

19.      SURRENDER OF LEASED PREMISES; REMOVAL OF PROPERTY...................................................    19

20.      COSTS OF SUIT/ATTORNEYS' FEES.......................................................................    20

21.      ASSIGNMENT AND SUBLETTING...........................................................................    21
</TABLE>

                                    - iii -
<PAGE>

<TABLE>
<S>                                                                                                              <C>
22.      TRANSFER OF LANDLORD'S INTEREST.....................................................................    22

23.      HOLDING OVER........................................................................................    23

24.      NOTICES.............................................................................................    23

25.      QUIET ENJOYMENT.....................................................................................    23

26.      COMPLIANCE WITH LAW.................................................................................    24

27.      ESTOPPEL CERTIFICATE BY TENANT......................................................................    24

28.      SUBORDINATION, ATTORNMENT, AND NON-DISTURBANCE......................................................    25

29.      RIGHTS RESERVED TO LANDLORD.........................................................................    26

30.      FORCE MAJEURE CLAUSE................................................................................    27

31.      INDEMNITY AND INSURANCE.............................................................................    27

32.      EXPANSION OPTION....................................................................................    29

33.      MISCELLANEOUS.......................................................................................    30
</TABLE>

Exhibits
--------
Exhibit A      Leased Premises
Exhibit B      Work Letter
Exhibit C      Form of Estoppel Certificate
Exhibit D      Rules and Regulations
Exhibit E      Letter of Credit
Exhibit F      Janitorial Services

                                     - iv -

<PAGE>

                              TABLE OF DEFINITIONS

ADA - as defined in Section 11.3.

ALTERATIONS -as defined in Section 12.1.

BASIC ANNUAL RENT - as defined in Article 3.

BUILDING - as defined in Section 1.1.

BUILDING-WIDE LAWS - as defined in Article 26.

BUILDOUT ALLOWANCE - as defined in Exhibit B.

COMMENCEMENT DATE - as defined in Section 2.1.

CONTRACTOR- as defined in Section 1.3.

EQUIPMENT TAXES - as defined in Section 6.1.

ESTIMATED COMMENCEMENT DATE - as defined in Section 2.3.

EVENT OF DEFAULT - as defined in Article 17.

EXPIRATION DATE - as defined in Section 2.1.

FORCE MAJEURE - as defined in Article 30.

LANDLORD - as defined in the preamble.

LANDLORD'S REPRESENTATIVES - as defined in Article 31.

LANDLORD'S WORK - as defined in Exhibit B.

LATE CHARGE - as defined in Section 8.1.

LEASE - as defined in Summary of Basic Lease Information.

LEASE YEAR - a twelve-month period during the term beginning on the same date as
the Commencement Date in a calendar year.

LEASED PREMISES - as defined in Section 1.1.

MORTGAGEE - as defined in Article 28.

OPERATING EXPENSES - as defined in Section 5.5.

OPERATING STATEMENT - as defined in Section 5.2.

OPERATING YEAR - as defined in Section 5.2.

PERMITTED USES- as defined in the Summary of Basic Lease Information.

PROPERTY - as defined in Section 1.2.

SD HOLDER - as defined in Article 7.

SECURITY DEPOSIT - as defined in Article 7.

TAKING -as defined in Section 16.1.

                                      - v -

<PAGE>

TAX STATEMENT - as defined in Section 4.2.

TAX YEAR - as defined in Section 4.2.

TENANT - as defined in the preamble.

TENANT DELAY - as defined in Section 2.3.

TENANT'S EXPENSE SHARE - as defined in Section 5.1.

TENANT'S PLANS - as defined in Exhibit B.

TENANT'S REMOVABLE PROPERTY - as defined in Section 31.2.

TENANT'S REPRESENTATIVES - as defined in Article 26.

TENANT'S TAX SHARE - as defined in Section 4.1.

TENANT'S WORK - as defined in Exhibit B.

                                     - vi -

<PAGE>

                                 LEASE AGREEMENT

         THIS LEASE is made and entered into this 25 day of April, 2000, by and
between RAK Old South Associates Limited Partnership, a limited partnership
organized under the laws of the Commonwealth of Massachusetts, ("LANDLORD") and
Color Kinetics, Inc., a corporation organized under the laws of Delaware
("TENANT').

         1.       LEASED PREMISES.

         1.1      Subject to and upon the terms, conditions and covenants
contained in this Lease, LANDLORD hereby leases to TENANT and TENANT hereby
leases from LANDLORD the premises, being the entire eleventh floor of the Old
South Building, 10 Milk Street, Boston, Massachusetts (the "BUILDING"), and more
particularly shown on Exhibit A attached hereto and incorporated herein by
reference (the "LEASED PREMISES").

         1.2      All references in this Lease to the "PROPERTY" shall mean and
include the land known as 10 Milk Street, Boston Massachusetts and the Building
of which the Leased Premises are a part.

         1.3      TENANT acknowledges and agrees that TENANT is leasing the
Leased Premises in an "as is" condition, without the making of any repair or
Alteration except LANDLORD shall use commercially reasonable efforts (i) to
complete LANDLORD's Work prior to the Estimated Commencement Date, and (ii) to
supervise TENANT'S Contractor so that TENANT'S Work will be complete prior to
the Estimated Commencement Date. LANDLORD has agreed, for the fee set forth in
Exhibit B to act as the Project Manager for the TENANT'S Work. As such, TENANT
shall not be responsible for the supervision of the contractor selected to
perform TENANT'S Work (the "CONTRACTOR") and no delay by the Contractor in the
performance of TENANT'S Work shall be deemed to be a TENANT'S Delay, unless the
Contractor's Delay is due to TENANTS act or omission, including, without
limitation, TENANT'S delay in delivering TENANT'S Plans.

         1.4      TENANT acknowledges and agrees that the Leased Premises
contain approximately 20,271 square feet of rentable area and that the Leased
Premises comprise ten and two hundredths percent (10.02%) of the total rentable
area of the Building and ten and ninety hundredths percent (10.90%) of the
office space in the Building.

         2.       TERM.

         2.1      The term of this Lease shall be for seven (7) years commencing
on the date (the "COMMENCEMENT DATE") which is five (5) days after the date on
which (i) LANDLORD shall have substantially completed LANDLORD's Work and (ii)
TENANTS contractor shall have substantially completed TENANT'S Work, and ending
on the day preceding the seventh anniversary of the Commencement Date (the
"EXPIRATION DATE") unless extended or earlier terminated as hereinafter
provided. If the Commencement Date is not the first day of a month, the term
shall be extended by the number of days necessary to cause the Expiration Date
to occur on the last day of the last calendar month of the term. Rent for any
partial month during the term shall be prorated.

                                     - 1 -
<PAGE>

         For all purposes of this Lease, the Leased Premises shall be deemed
substantially complete upon the later to occur of (i) completion of all of
LANDLORD's Work and TENANT's Work, except for any punch list items, the
completion of which will not materially interfere with the TENANT's use and
occupancy of the Leased Premises, and (ii) issuance of a certificate of
occupancy for the Leased Premises.

         From time to time, upon TENANT's request, LANDLORD shall advise TENANT
of the progress of the LANDLORD's Work and TENANT's Work and the approximate
date on which both will be substantially completed. In addition, whether or not
TENANT requests the same, LANDLORD will use reasonable efforts to provide TENANT
with at least 30 days notice of the date on which LANDLORD reasonably believes
the LANDLORD's Work and TENANT's Work will be substantially complete. TENANT
acknowledges that any such estimate by LANDLORD shall not be binding on LANDLORD
and shall not be construed as anything more than a good faith estimate based
upon the circumstances known to LANDLORD at such time.

         2.2      Upon commencement of the term, TENANT and LANDLORD shall agree
in writing as to the proper date of the Commencement Date.

         2.3      In the event that substantial completion of TENANT's Work is
delayed due to causes within TENANT's reasonable control, including TENANT's
failure to furnish specifications, information, approvals, consents or the like
as required hereunder no later than May 7, 2000 (a "TENANT DELAY"), on the
Commencement Date in addition to any other amounts due under this Lease, TENANT
shall pay to LANDLORD pro rated Basic Annual Rent for each day of TENANT Delay.

         2.4      In the event (i) LANDLORD has failed to complete LANDLORD's
Work or (ii) TENANTs contractor has failed, for reasons other than TENANT Delay,
to substantially complete TENANT's Work within three (3) months after August 1,
2000 (such date in August being the "ESTIMATED COMMENCEMENT DATE"), TENANT may
elect to terminate this Lease by giving two (2) weeks written notice thereof to
LANDLORD.

         2.5      TENANT shall have the right to extend the term of this Lease
for one (1) five-year period in the following manner. At any time during the
eighth (8th) through and including the eleventh (11th) months of the sixth (6th)
Lease Year, TENANT shall give written notice to LANDLORD requesting that
LANDLORD state the amount of the Basic Annual Rent for the extended term, which
Basic Annual Rent shall be the greater of (i) the then-current Basic Annual Rent
and (ii) the Prevailing Market Rent, as hereinafter defined. LANDLORD shall have
until the fifteenth (15th) day of the twelfth (12th) month of the sixth (6th)
Lease Year to respond in writing to TENANT's request. TENANT shall then have
until the final day of the sixth (6th) Lease Year to exercise its option to
extend the term of this Lease.

         PREVAILING MARKET RENT shall mean the rental that a landlord would be
able to obtain from a third party desiring to lease the Leased Premises for the
extension term taking into account the age of the building, the size and
location of the Leased Premises, the services provided, the terms of the Lease,
and all other relevant factors.

         If TENANT disagrees with LANDLORD'S determination of the Prevailing
Market Rent,

                                     - 2 -
<PAGE>

TENANT may challenge such determination in the following manner, provided
however, TENANT may challenge such determination only after TENANT has
irrevocably exercised its extension option. TENANT shall give notice to LANDLORD
of TENANT's intent to submit the matter to the appraisal process described below
within thirty (30) days after TENANT exercises its extension option. If TENANT
so elects, then within fifteen (15) days after the date of TENANT's notice of
its election to submit the matter to the appraisal process, each party, at its
cost, shall engage a real estate appraiser to act on its behalf in determining
the Prevailing Market Rent for the Leased Premises for the extension term. The
appraisers shall have at least five (5) years' commercial experience in the
Boston metropolitan area, be designated as MAI appraisers, and shall be persons
who would qualify as expert witnesses over objection to give opinion testimony
on the issue of the Prevailing Market Rent in a court of competent jurisdiction.
If a party does not appoint an appraiser within fifteen (15) days after the
other party has given notice of the name of its appraiser, the single appraiser
appointed shall be the sole appraiser and shall set the Prevailing Market Rent.
If the two appraisers are appointed by the parties as stated in this Section,
such appraisers shall meet promptly and attempt to set the Prevailing Market
Rent. If such appraisers are unable to agree within thirty (30) days after
appointment of the second appraiser, the appraisers shall elect a third
appraiser meeting the qualifications stated in this paragraph within ten (10)
days after the last date the two appraisers are given to set the Prevailing
Market Rent. Within thirty (30) days after the selection of the third appraiser,
each appraiser shall render a separate appraisal. The rental values and terms
arrived at by the three appraisers shall be averaged, and the resulting average
shall be deemed the Prevailing Market Rent. However, in the event that there are
three appraisals and the Prevailing Market Rent arrived at in any of the
appraisals is more than ten percent (10%) higher or lower than the middle
appraised Prevailing Market Rent, such high or low appraisal shall be discarded
and the remaining two appraised values shall be averaged. If either by agreement
of the parties or by appraisal the Prevailing Market Rent is not finally
determined by the commencement of the extension term, then TENANT shall make
monthly payments of Basic Annual Rent at the rate designated by LANDLORD until
such time as the Prevailing Market Rent is finally determined by agreement of
the parties or by an appraiser. If the monthly Prevailing Market Rent exceeds
the monthly amount previously paid by TENANT for the extension term, TENANT
shall forthwith pay the difference to LANDLORD for each of the months TENANT
paid the lesser amount. If the monthly Prevailing Market Rent as finally
determined for the Extension Term is less than the monthly amount previously
paid by TENANT for the Extension Term, LANDLORD shall forthwith pay the
difference to TENANT for each of the months TENANT paid the greater amount.

         2.6      The TENANT shall be allowed reasonable access to the Leased
Premises prior to the Commencement Date for the purpose of installing voice and
data cabling and other wiring and equipment as permitted under this Lease. Such
access shall be deemed to be pursuant to, and shall be governed by, the terms,
provisions, conditions and covenants of this Lease, except that TENANT shall not
be required to make any payments of Basic or Additional Rent with respect to
such occupancy. TENANT and LANDLORD agree to work together in good faith to
schedule appropriate times for TENANTS contractors and employees to undertake
such work.

         2.7      LANDLORD shall deliver the Leased Premises to TENANT free of
all tenants and other occupants.

                                     - 3 -
<PAGE>

         3.       BASIC ANNUAL RENT.

         For the term of this Lease, TENANT shall pay to LANDLORD without
reduction, abatement or set-off (except as specifically set forth in Articles 2,
15 and 16 hereof), rent at the following annual rates:

         Lease Years 1-3   $831,111.00 ($41.00 per rentable square foot)

         Lease Years 4-7   $851,382.00 ($42.00 per rentable square foot)

         Such amounts are hereinafter referred to as the "BASIC ANNUAL RENT".
Throughout the term of this Lease, the Basic Annual Rent shall be payable on the
first day of each calendar month, in advance, and at the same rate for any part
of a month. For Lease Years 1-3, the equal monthly installments of Basic Annual
Rent shall be $69,259.25. For Lease Years 4-7, the equal monthly installments of
Basic Annual Rent shall be $70,948.50. Basic Annual Rent shall be paid to RAK
Old South Associates Limited Partnership, Hatfield Phillips, Inc., on behalf of
LBHI, P.O. Box 101-203, Atlanta, Georgia 30392-1203, or at such other address as
may be designated by LANDLORD from time to time. The first installment of Basic
Annual Rent is to be paid on the date of this Lease.

         4.       ADDITIONAL RENT - TAX ESCALATION.

         4.1      In the manner and according to the schedule set forth in
Section 4.2, during the term of this Lease, and any extension or renewal thereof
and any further period during which TENANT shall hold the Leased Premises, or
any part thereof, as a tenant-at-will or tenant-at-sufferance, TENANT shall pay
to LANDLORD without reduction, abatement or set-off, as additional rent, an
amount equal to ten and two hundredths percent (10.02%). ("TENANT'S TAX SHARE")
of any real estate taxes levied with respect to the Property for each Tax Year
in excess of $4.60 per rentable square foot of the Leased Premises, pro-rated
for any fractional part of a year at the beginning or at the end of the tenancy.
It is understood that such excess may result from a change in either the real
estate tax rate or the assessed valuation of said property or both, or by reason
of the levy, assessment or imposition of any tax or charge on real estate or
income therefrom as such is not now levied or imposed.

         4.2      With each installment of Basic Annual Rent, TENANT shall pay
to LANDLORD as additional rent an amount reasonably estimated by LANDLORD to be
one-twelfth of Tenant's Tax Share of such excess taxes. The additional rent
payments shall be subject to adjustment at the end of each fiscal year during
the term and after the expiration or termination of this Lease as follows:

         As soon as practical following the end of each fiscal year commencing
on July 1 in a given year and ending on June 30 in the following calendar year
(a "TAX YEAR"), LANDLORD shall furnish TENANT with a statement of the actual
Taxes and Tenant's Tax Share thereof for the Tax Year just ended (a "TAX
STATEMENT"). If Tenant's Tax Share paid was more than the actual Tenant's Tax
Share due with respect to such Tax Year, LANDLORD shall apply such overpayment
against Basic Annual Rent next becoming due hereunder. If Tenant's Tax Share
paid was less than the actual Tenant's Tax Share due with

                                     - 4 -
<PAGE>

respect to such Tax Year, TENANT shall pay LANDLORD the amount of such
underpayment within 30 days after receipt of the LANDLORD's statement.

         4.3      In the event LANDLORD receives an abatement of a tax with
respect to which TENANT shall have paid its share pursuant to the foregoing, a
proportionate part of such abatement, after deduction therefrom of the
reasonable costs of obtaining the same, including without limitation attorneys'
fees and appraisers' fees, shall be refunded to TENANT. The provisions of this
Article 4 shall survive the end of the term.

         5.       ADDITIONAL RENT - OPERATING EXPENSE ESCALATION.

         5.1      In the manner and according to the schedule set forth in
Sections 5.2 and 5.3, during the term of this Lease, and any extension or
renewal thereof and any further period during which TENANT shall hold the Leased
Premises, or any part thereof, as a tenant-at-will or tenant-at-sufferance,
TENANT shall pay to LANDLORD without reduction, abatement or set-off, as
additional rent, an amount equal to ten and ninety hundredths percent (10.90%)
("TENANT'S EXPENSE SHARE") of Operating Expenses in excess of $7.40 per rentable
square foot of the Leased Premises per annum, pro-rated for any fractional part
of a year at the beginning or at the end of the tenancy.

         5.2      With each installment of Basic Annual Rent, TENANT shall pay
to LANDLORD as additional rent an amount reasonably estimated by LANDLORD to be
one-twelfth of Tenant's Expense Share of such excess Operating Expenses. The
additional rent payments shall be subject to adjustment during the term and
after the expiration or termination of this Lease as follows:

         Within a reasonable time after each calendar year during the term of
this Lease, LANDLORD shall forward to TENANT an itemized statement of the total
Operating Expenses for such year ("OPERATING YEAR") and a computation of the
amounts payable by TENANT pursuant to this Article 5 for such year ("OPERATING
STATEMENT"). LANDLORD or TENANT shall, within thirty (30) days after TENANTs
receipt of an Operating Statement, make appropriate refund or payment (without
interest), respectively, to the other, based on the amount claimed to be due in
accordance with such Operating Statement and the amount paid on account thereof
pursuant to Section 5.1.

         5.3      Until LANDLORD forwards the applicable Operating Statement for
the preceding Operating Year, TENANT shall continue to pay the amount of the
monthly payments due during the preceding Operating Year, subject to prompt
additional payment or refund (without interest) for the intervening months once
such Operating Statement is forwarded by LANDLORD to TENANT.

         5.4      The term "OPERATING EXPENSES" shall mean, for each calendar
year, the aggregate costs and expenses incurred by LANDLORD for operation,
maintenance and management of the Property, including, without limiting the
generality thereof, the following: (i) salaries, wages, medical, surgical and
general welfare benefits (including group insurance and retirement benefits)
for employees of LANDLORD or any agent or contractor of LANDLORD engaged in the
cleaning, operation, maintenance, security, or management of the Property, and
payroll taxes

                                     - 5 -
<PAGE>

and insurance premiums (usual and customary) relating thereto; (ii) Building
electricity (but not electricity furnished to tenants), oil, gas, steam and
water (including sewer assessment and utility tax); (iii) fire, casualty,
liability, sprinkler, water damage, rent and other insurance carried by LANDLORD
and any additional insurance as may be required by any mortgagee; (iv) repairs
and maintenance of the Building and Building systems (including, without
limitation, plumbing, heating, steam, elevators, air-conditioning units,
electrical system), as affected by the provision below regarding capital
expenditures; (v) Building supplies, uniforms and cleaning thereof; (vi) snow
removal; (vii) cleaning of Building common areas; (viii) cleaning of all leased
and other space occupied by tenants, tenants-at-will and tenants-at-sufferance;
(ix) rubbish removal; (x) window cleaning; (xi) service contracts with
independent contractors for any of the foregoing (including without limitation,
elevator, boiler and air-conditioning maintenance, cleaning, rubbish removal,
security and similar services); (xii) accounting and legal fees incurred in the
operation of the Building and common areas; (xiii) expenses incurred by LANDLORD
in connection with compliance with any law, rule, order, ordinance, regulation
or requirement of any governmental authority; (xiv) management fees at
reasonable rates consistent with the type of occupancy and service rendered,
whether or not paid to any person, firm, corporation or other entity having an
interest in, or existing business relationship with, or common officers,
directors or trustees with LANDLORD, or any affiliate of either; and (xv) All
other expenses now or hereafter customarily incurred in connection with the
operation, maintenance and management of office buildings;

EXCEPT that the following items shall be excluded from the definition of
"OPERATING EXPENSES": (i) any payments on mortgages encumbering the Property,
(ii) brokerage fees, (iii) legal fees in connection with negotiation of leases
and enforcement of existing leases, (iv) costs and expenses of fitting-up space
for tenants, (v) special services for which separate charges are made to
tenants, (vi) expenses incurred by LANDLORD in connection with services or other
benefits of a type which are not building standard services or benefits provided
to tenants generally, but which are provided only to specific tenants, including
without limitation, costs of painting, renovating, decorating or redecorating,
(vii) salaries of officers and executives of LANDLORD not connected with the
operation of the Property, and personnel costs of any employee above the grade
of building superintendent, building manager or chief engineer, (viii) capital
expenditures, except to the extent expressly permitted elsewhere in this Section
5.4, (ix) any charge for depreciation, (x) advertising and promotional expenses
associated with the marketing of vacant space in the Building, (xi) costs and
expenses incurred by LANDLORD in connection with the repair of damage to the
Building or Property caused by fire or other casualty, insured or required to be
insured against hereunder, (xii) overhead and profit increment paid to
subsidiaries or affiliates of the LANDLORD for services to the Building, to the
extent that such overhead and profit increment exceeds the amount of such
increment that would be included in the cost for such services if such services
were rendered at competitive rates by unaffiliated persons or entities of
similar skill, competence and experience, (xiii) the cost of correcting defects
in the initial construction or recent renovation of the Building, (xiv) the cost
of any item for which the LANDLORD is reimbursed through condemnation awards or
insurance proceeds, (xv) costs incurred due to violation by the LANDLORD or any
other tenant of the Building of any lease or any laws, rules, regulations or
ordinances applicable to the Building, (xvi) the cost of any work performed or
service provided for which the LANDLORD is otherwise reimbursed, and (xvii)
costs or expenses, whether categorized as capital expenses or operating
expenses, incurred by LANDLORD in connection with the initial renovation of the
Building, including

                                     - 6 -
<PAGE>

without limitation labor and material costs, costs of replacement of equipment,
cost of renovating common areas and tenant space; cost of asbestos removal;
costs of cleaning common areas required as a result of construction activities,
repairs to damage of the Building caused by construction activities, and other
like charges.

If, during the term of this Lease, LANDLORD shall make a capital expenditure for
the purpose of reducing Operating Expenses, the total cost of which is not
properly includable in Operating Expenses for the year in which it was made,
there shall nevertheless be included in such Operating Expenses for the year in
which it was made and for each succeeding year the annual charge-off of such
capital expenditure. Annual charge-off shall be determined by dividing (i) the
original capital expenditure plus an interest factor, reasonably determined by
LANDLORD as being the interest rate then being charged for long-term mortgages
by institutional lenders on like properties within the Greater Boston area, by
(ii) the number of years of useful life of the capital expenditure, as such
useful life shall be determined reasonably by LANDLORD in accordance with
generally accepted accounting principles and practices in effect at the time of
making such expenditure.

         5.5      LANDLORD shall keep and maintain at LANDLORD's office at the
Building full and accurate books of accounts and records, in accordance with
generally accepted accounting practices and principles consistently applied,
from which Operating Expenses, Taxes, Tenant's Tax Share and Tenant's Expense
Share can be determined for the period in question. For a ninety (90) day period
after receipt of an Operating Statement or Tax Statement, TENANT shall have the
right during LANDLORD's business hours and upon reasonable prior notice to
LANDLORD, to inspect or audit all such books and records relating to Operating
Expenses and Taxes for the period which was covered by said Operating Statement
or Tax Statement. If any such audit discloses that Operating Expenses, Taxes,
Tenant's Tax share or Tenant's Expense Share was overstated, LANDLORD shall
promptly pay to TENANT any excess paid by TENANT, and if such share was
overstated by more than four (4%) percent, LANDLORD shall also reimburse TENANT
for the cost of TENANT's audit or inspection. If any such audit discloses that
Operating Expenses, Taxes, Tenant's Tax Share or Tenant's Expense Share was
understated, TENANT shall promptly pay to LANDLORD the difference.

         5.6      The provisions of this Article 5 shall survive the end of the
term.

         6.       TAX ON TENANT'S PROPERTY; OTHER TAXES.

         TENANT, shall be liable for, and shall pay, at TENANT's sole cost and
expense, at least ten (10) days before delinquency, all taxes levied against any
personal property, fixtures, machinery, equipment, apparatus, systems and
appurtenances placed by TENANT in or about, or owned or leased by TENANT in,
upon or in connection with, the Leased Premises ("EQUIPMENT TAXES"). If any
Equipment Taxes are levied against LANDLORD or the Property, or if the assessed
value of the Property is increased by the inclusion therein of a value placed
upon such personal property, fixtures, machinery, equipment, apparatus, systems
or appurtenances of TENANT, then TENANT shall pay such Equipment Taxes or the
amount of such increased assessment promptly upon demand by LANDLORD.

         7.       SECURITY DEPOSIT.

                                     - 7 -
<PAGE>

         A deposit (the "SECURITY DEPOSIT") in the form of cash or an
unconditional, irrevocable $1,000,000.00 letter of credit issued by a national
bank reasonably acceptable to LANDLORD, and in the form of EXHIBIT E attached
hereto and incorporated herein by reference, shall be paid by TENANT within five
(5) business days after execution of this Lease and shall be held by the holder
of the first mortgage on the Building (the "SD HOLDER") without liability for
interest and as security for the performance by TENANT of TENANT's covenants and
obligations under this Lease, it being expressly understood that the Security
Deposit shall not be considered an advance payment of rent or a measure of
LANDLORD's damages in case of default by TENANT. The SD Holder shall provide
TENANT with acknowledgement of the receipt thereof and shall from time to time,
at TENANT's request, provide TENANT with information with respect to the status
thereof. Notwithstanding the deposit of the Security Deposit with the SD Holder,
LANDLORD shall retain all obligations with respect thereto set forth herein. In
the event that cash is, at any time, held as the Security Deposit hereunder, the
holder thereof shall hold such cash as trustee in a segregated account for the
property for the benefit of the TENANT subject only to the terms and provisions
of this Lease. Upon the occurrence of any Event of Default under this Lease by
TENANT, LANDLORD may, from time to time, without prejudice to any other remedy
and without prior notice, use such portion of the Security Deposit as is
necessary to make good any arrearages of any installment of Basic Annual Rent,
additional rents, or other amounts or charges payable by TENANT hereunder, or
any other damage, injury, expense, or liability caused to LANDLORD by such
breach or default. For draws by LANDLORD for damage, injury, expense or
liability other than failure by TENANT to pay Basic Annual Rent or additional
rents, LANDLORD will not draw an amount in excess of $100,000.00 without five
(5) business days notice to TENANT specifying the amount of the intended draw.
At any time LANDLORD is holding cash as the Security Deposit hereunder, TENANT
shall have the right, in accordance with the terms hereof, to replace such cash
with a letter of credit and upon such replacement, LANDLORD shall return the
cash held to TENANT. If LANDLORD shall transfer its interest in the property,
LANDLORD shall assign the Security Deposit to the transferee.

         At the end of every Lease Year, TENANT shall have the right to reduce
the amount of cash by $100,000.00 or replace the letter of credit comprising the
Security Deposit with a letter of credit in an amount reduced by $100,000.00,
provided in either instance, at no time during the previous Lease Year has there
been a Tenant Event of Default under this Lease. Following any application of
the Security Deposit, if the Security Deposit is in the form of a letter of
credit TENANT shall have issued to LANDLORD on demand a replacement letter of
credit in the full amount of the letter of credit prior to LANDLORD's draw.
Failure by TENANT to replace the letter of credit (i) in the full amount within
ten (10) days of receipt by TENANT of notice of LANDLORD's draw or (ii) no later
than five (5) days prior to the stated expiration date, shall, in either
instance, be an Event of Default under this Lease, and in the case the event
described in (ii) occurs, shall permit LANDLORD to draw the entire amount of the
letter of credit. Any balance of the Security Deposit remaining at the end of
the term shall be returned to TENANT within thirty (30) days after TENANT's
compliance with each and every provision of Article 19 hereof.

         In the event TENANT exercises its option to acquire all or part of the
tenth floor, TENANT shall increase the Security Deposit by $1,000,000.00
(subject to reduction as set forth in Section 32.1) at the time of exercise of
the option, and thereafter the annual reduction of the total Security Deposit
shall continue to be $100,000.00.

                                     - 8 -
<PAGE>

         8.       LATE PAYMENTS.

         8.1      In the event TENANT fails to pay any installment of Basic
Annual Rent, additional rents, or other amounts or charges payable hereunder
when and as due, and the delinquency continues for a period of five (5) business
days after the day the amount as due hereunder (without notice or demand),
TENANT shall also pay to LANDLORD with such delinquent amount a late charge in
an amount equal to five percent (5%) of the delinquent amount for the purpose of
defraying administrative costs and expenses (but specifically excluding
attorneys' fees, court costs, and other damages) incident to handling the
delinquency (the "LATE CHARGE"). The Late Charge shall be deemed additional rent
and the right to require it shall be in addition to all of LANDLORD's other
rights and remedies hereunder or at law or in equity and shall not be construed
as interest or liquidated damages or as limiting LANDLORD's remedies in any
manner.

         8.2      All monetary obligations of either party hereunder to the
other remaining past due five (5) business days or more after the date specified
herein for payment shall bear interest from the due date so specified until paid
at the rate of the greater of (i) one percent (1%) per month or (ii) four
percent (4%) per annum above the prime rate charged by Fleet Bank of Boston or
its successor.

         8.3      Notwithstanding anything contained herein to the contrary and
notwithstanding the collection by LANDLORD of Late Charges and interest, the
failure of TENANT to timely pay any installment of Basic Annual Rent, additional
rents, or other amounts or charges payable by TENANT hereunder shall constitute
an Event of Default as provided in Article 17 hereof.

         9.       USE OF LEASED PREMISES.

         TENANT shall use the Leased Premises only for the Permitted Uses,
subject to compliance with all applicable laws, ordinances, rules, regulations,
orders and directives.

         10.      UTILITIES AND SERVICES.

         10.1     The Leased Premises are separately metered for electricity.
TENANT shall pay all charges for electricity furnished to the Leased Premises
directly to the utility company servicing the Building. In addition, subject to
Section 12.5 of this Lease TENANT shall, at its sole cost and expense, make all
arrangements for and pay for all telephone, computer, and all similar services
used by TENANT. TENANT shall also pay for the use of the air handlers at the
Leased Premises. Upon written request by TENANT and at TENANT's expense,
LANDLORD will install additional air handlers (beyond those to be provided per
LANDLORD's Work) for a one-time hookup cost of $500 per air handler.

         10.2     LANDLORD agrees to furnish to TENANT, as an Operating Expense,
the following, which are subject always to Force Majeure: (i) water for use in
the lavatories and kitchen on each floor on which the Leased Premises are
located, (ii) elevator service, (iii) electricity to the Leased Premises for
general office use, and (iv) during normal business hours, heat and air
conditioning in season, at such temperature and in such amounts as are standard
for comparable buildings or as required by government authority. For the
purposes of this Lease, normal business hours shall be 8:00 a.m. to 6:00 p.m.
Monday through Friday, excluding

                                     - 9 -
<PAGE>

holidays, and 8:00 a.m. to 1:00 p.m. on Saturdays; the normal heating season of
the year shall be October 1 through May 15; and the normal cooling season of the
year shall be May 16 through September 30. Upon forty-eight (48) hours prior
notice from TENANT, LANDLORD shall provide overtime heating/cooling to the
Leased Premises at a cost of the greater of (i) the cost per hour as shown on
the most recent utility company invoice, or (ii) $100 per hour. TENANT shall
have access to the Leased Premises twenty-four hours a day, seven days a week.

         10.3     Standard Building cleaning service, as described in EXHIBIT F
attached hereto, including window cleaning and rubbish removal, shall be
furnished by LANDLORD as an Operating Expense. LANDLORD shall have no obligation
to furnish cleaning service for any portion of the Leased Premises which may be
used (to the extent permitted under this Lease) for the preparation, dispensing
or consumption of food or beverages or for any purpose other than general office
use, and TENANT shall keep such portions of the Leased Premises in a clean and
orderly condition at TENANT's sole cost and expense. In the event that TENANT
shall fail to keep such portions of the Leased Premises in a clean and orderly
condition, LANDLORD may do so and any costs incurred by LANDLORD in connection
therewith shall be payable by TENANT to LANDLORD upon demand, as additional rent
hereunder. TENANT shall also pay to LANDLORD, as additional rent hereunder,
amounts equal to any increase in the cost of cleaning service in and about the
Leased Premises if such increase in cost is due to (a) use of the Leased
Premises by TENANT during hours other than normal business hours, or (b)
location in, on or about the Leased Premises of any fixtures, improvements,
materials or finish items (including without limitation wall coverings and floor
coverings) other than those which are of the standard type adopted by LANDLORD
for the Building.

         10.4     LANDLORD shall provide on-site Building security by
maintaining a security attendant in the main lobby of the Building twenty-four
hours per day. Building security service will constitute an Operating Expense.

         10.5     TENANT shall have the right to use, in common with others, on
floors where the Leased Premises constitutes some but not all of the rentable
space on a floor, the stairways, entrances and elevators of the Building,
subject always to Force Majeure.

         10.6     TENANT agrees that, at all times, TENANTs use of electricity
and other utilities and services shall never exceed the capacity of the feeders
to the Building or the risers or wiring installation in the Building. TENANT
shall not install or use or permit the installation or use in, on or about the
Leased Premises of any fixture, equipment, machinery, apparatus or system using
electric current in excess of 100 volts or requiring power in excess of 500
watts, without the express prior written consent of LANDLORD which shall not be
unreasonably withheld. TENANT shall pay, at its sole cost and expense (and
reimburse LANDLORD, as appropriate and upon billing, as additional rent under
this Lease), any and all costs and expenses in any way relating to the purchase,
installation, operation, maintenance and repair of any additional facilities,
wires, pipes, fixtures, equipment, machinery, apparatus, system, and related
accessories and appurtenances attributable to TENANT's use of the Leased
Premises.

         11.      CONDITION OF PREMISES.

         11.1     Subject to (i) substantial completion of the LANDLORD's Work
and TENANT's

                                     - 10 -
<PAGE>

Work, (ii) the correction of punch list items described in Section 2.1, and
(iii) latent defects and necessary corrections and adjustments to seasonal items
such as heating and air conditioning of which TENANT provides timely notice to
LANDLORD within one year following the Commencement Date, by taking possession
of the Leased Premises, TENANT shall be deemed to accept the same and
acknowledge that they comply fully with LANDLORD's covenants and obligations
hereunder. TENANT acknowledges that neither LANDLORD nor any officer, director,
trustee, employee, servant, agent, contractor or representative of LANDLORD has
made any representation or warranty with respect to the Property or the Leased
Premises or with respect to the suitability or fitness of the Property or the
Leased Premises for the conduct of TENANT's business or any other purpose.

         LANDLORD shall use good faith efforts to correct or complete any punch
list items as soon as reasonably possible, and, provided notice is given to
LANDLORD in accordance with the provisions of this Section 11.1, to correct any
latent defects and make any necessary corrections and adjustments to seasonal
items such as heating and air conditioning that are not readily discoverable by
TENANT on or about the date of Substantial Completion within a reasonable time
after receipt of notice of the need therefor from TENANT.

         11.2     During the term of this Lease and any further period during
which TENANT shall hold the Leased Premises, or any part thereof, as a
tenant-at-will or tenant-at-sufferance, TENANT at its sole cost and expense
shall maintain the Leased Premises in as good condition and repair as when
TENANT took possession, reasonable wear and tear and damage by casualty or
condemnation only excepted, and shall repair all damage or injury to the Leased
Premises or to windows, glass, fixtures, equipment, machinery, apparatus,
systems, wires, pipes, facilities and related accessories and appurtenances of
the Leased Premises caused by TENANT's installation or removal of its property
or resulting from the conduct of TENANT and TENANT's Representatives.

         11.3     LANDLORD shall be responsible for constructing LANDLORD's Work
and TENANT's Work in compliance with all Laws, including Title III of the
Americans with Disabilities Act (the "ADA"), provided that TENANT, not LANDLORD,
shall be responsible for the correction of any violations that arise out of a
failure by TENANT's architect to prepare TENANT's Plans in compliance with all
Laws, including the ADA. LANDLORD shall be responsible for compliance of the
Building and Leased Premises with all Laws, except as provided in Sections 12.4
and 26 below, unless a lack of compliance is due to the failure of TENANT's
Plans to comply with applicable laws.

         12.      ALTERATIONS OR ADDITIONS.

         12.1     TENANT shall make no alterations, additions, installations,
changes or improvements (collectively "ALTERATIONS") to, in, on or about the
Leased Premises without in each instance LANDLORD's prior written consent having
first been obtained, which consent shall not be unreasonably withheld or
delayed. Notwithstanding the foregoing, LANDLORD's consent shall not be required
for any Alteration that is not visible from the exterior of the Leased Premises
or Building, will not affect the systems or structure of the Building; and does
not exceed in each case a cost of $25,000. Without limiting the foregoing, it is
agreed that TENANT shall have the right to install voice and data cabling and
its own lighting products in the Leased

                                     - 11 -
<PAGE>

Premises without the consent of LANDLORD. No such consent granted by LANDLORD in
a particular instance shall relieve TENANT of the obligation to obtain such
consent in any other instance. LANDLORD may impose, as a condition to its
consent, such requirements as LANDLORD in its reasonable discretion may deem
desirable, including, but not limited to, the requirement that TENANT utilize
only contractors, materials, mechanics and materialmen approved by LANDLORD
which consent shall not be unreasonably withheld or delayed. Under no
circumstances shall any Alteration be made which might weaken or impair the
structure of or reduce the value of the Leased Premises or the Building.

         12.2     Except as specifically included in LANDLORD's Work, all
Alterations, in, on or about the Leased Premises shall be made, purchased and
constructed at TENANT's sole cost and expense, and shall be of a quality in
materials and workmanship at least equal to the present construction.

         12.3     All Alterations constructed, placed or made to, in, on or
about the Leased Premises shall be and become part of the realty and the sole
and absolute property of LANDLORD and shall remain upon and be surrendered with
the Leased Premises at the expiration or earlier termination of this Lease
unless LANDLORD by notice delivered to TENANT as set forth in the following
sentence elects to relinquish LANDLORD's rights thereto, in which case TENANT
shall remove such Alterations or additions prior to the end of the term and
restore the Premises to the condition existing prior to such alteration or
addition. LANDLORD agrees that it shall advise TENANT at such time TENANT
requests LANDLORD's consent to any such Alteration whether or not TENANT shall
be required to remove same at the end of the term of this Lease and if removal
shall be so required, LANDLORD shall also advise TENANT of the nature of the
restoration which will be required as a result of such removal, provided that in
any such request by TENANT for LANDLORD's consent to the applicable Alteration,
TENANT shall specifically request LANDLORD to advise TENANT whether or not such
Alteration must be removed prior to the expiration of the term of this Lease and
the extent of any restoration. TENANT shall have the right to remove its
furniture, trade fixtures, equipment and other personal property from the Leased
Premises, but TENANT shall repair, at its sole cost and expense, any damage to
the Leased Premises or the Building caused by such removal. Notwithstanding
anything to the contrary provided herein, TENANT shall not be required to remove
any of TENANT's Work.

         12.4     TENANT warrants and agrees that from and after the
Commencement Date, all Alterations to, in, on or about the Leased Premises shall
comply with and conform to all requirements, rules, regulations, laws, statutes,
ordinances, orders and directives of all legally constituted authorities
relating thereto. TENANT shall obtain all necessary permits and approvals at its
sole cost and expense and all applications therefor shall be submitted to
LANDLORD for approval or modification prior to filing. TENANT shall give
LANDLORD prior written notice of any inspection of the Leased Premises or
related common areas by any governmental authority.

         12.5     TENANT and its telecommunications companies, including but not
limited to local exchange telecommunications companies and alternative access
vendor services companies shall have no right of access to and within the
Building for the installation and operation of telecommunications systems,
including but not limited to voice, optic, microwave, wireless and

                                     - 12 -
<PAGE>

any other transmission systems, for part or all of TENANT's telecommunications
within the Building and from the Building to any other location without
LANDLORD's prior written consent. After completion of TENANT's Work, if TENANT
wishes to have any additional cables, wires or other components of a
telecommunications system installed in the Building, TENANT shall request
LANDLORD's consent, which may be conditioned on, among other things, execution
of a license agreement.

         12.6     Whenever TENANT requests LANDLORD to take any action or give
any consent required or permitted under this Lease, TENANT will reimburse
LANDLORD for LANDLORD's reasonable out-of-pocket costs incurred in reviewing the
proposed action or consent, including without limitation reasonable attorneys',
engineers' or architects' fees, within ten (10) days after LANDLORD's delivery
to TENANT of a statement of such costs. TENANT will be obligated to make such
reimbursement without regard to whether LANDLORD consents to any such proposed
action.

         12.7     Upon completion of any Alterations to, in, on or about the
Leased Premises other than those specifically included in LANDLORD's Work or
TENANT's Work, TENANT shall make a one-time payment to LANDLORD in an amount
equal to four percent (4%) of any costs in excess of $25,000.00.

         13.      REPAIRS AND MAINTENANCE.

         Except as otherwise provided in Article 15 hereof, LANDLORD shall
maintain and repair as an Operating Expense, the roof, public areas, exterior
walls and structure of the Building, including the plumbing, steam and
electrical systems and other common facilities serving the Leased Premises as
may be necessary to keep the same in serviceable condition, provided maintenance
and repair of the air handlers for the Leased Premises shall be the obligation
of, and shall be done at the cost of TENANT.

         14.      LIENS.

         TENANT shall not file or record any notice of contract or other lien or
encumbrance with respect to the Leased Premises or any alteration, addition,
installation, change or improvement relating thereto or the maintenance and
repair thereof, and if such be filed, TENANT will do all things necessary and
pay all costs and expenses in connection with the removal of same, including
attorneys' fees. At TENANT'S expense, no earlier than 45 days after receipt by
TENANT of notice of such lien and only if TENANT shall have failed to have had
such lien removed, LANDLORD may, but shall not be obligated to, have such notice
of contract or other lien or encumbrance removed, cleared of record, discharged
or dissolved, by way of payment or bonding of same or otherwise, at LANDLORD'S
sole discretion, without inquiry as to the validity thereof, and any costs and
expenses including attorneys' fees, incurred by LANDLORD in connection therewith
shall be deemed additional rent hereunder due from TENANT to LANDLORD upon
demand.

         15.      DAMAGE TO BUILDING OR LEASED PREMISES.

         15.1     In the event that the Building should be substantially
destroyed by fire or other casualty, this Lease shall terminate on the date of
such destruction. If the Leased Premises or the

                                     - 13 -
<PAGE>

Building are damaged or destroyed, thereby rendering the Leased Premises totally
or partially inaccessible or unusable, and this Lease is not terminated pursuant
to the preceding sentence, then LANDLORD shall diligently repair and restore the
Leased Premises and the Building, but only to the extent permitted by the net
award of insurance proceeds, to substantially the same condition they were in
prior to such damage or destruction; provided, however, that if in LANDLORD's
judgment such repair and restoration cannot be completed within two hundred
seventy (270) days after the occurrence of such damage or destruction (taking
into account the time needed for effecting a satisfactory settlement with any
insurance company involved, removal of debris, preparation of plans and issuance
of all required governmental permits), then either LANDLORD or TENANT shall have
the right to terminate this Lease by giving written notice of termination to the
other within thirty (30) days after the occurrence of such damage or
destruction, for LANDLORD, or notice to TENANT of time required to restore.

         Notwithstanding anything herein to the contrary, LANDLORD shall not be
obligated to restore the Leased Premises or the Building and shall have the
right to terminate this Lease if (1) the holder of any mortgage encumbering the
Property fails or refuses to make insurance proceeds available for such repair
and restoration, or (2) the cost of repairing and restoring the Building would
exceed fifty percent (50%) of the replacement value of the Building, whether or
not the Leased Premises are damaged or destroyed.

         Notwithstanding anything to the contrary provided herein, in the event
that the LANDLORD fails to fulfill its obligation to restore the Leased Premises
as above provided within two hundred seventy (270) days after such fire or other
casualty for whatever reason, including without limitation, insufficiency of
available insurance proceeds, TENANT shall have the right to terminate this
Lease by written notice to LANDLORD prior to such restoration.

         15.2     In the event that the Building or the Leased Premises, or any
part thereof, are damaged or destroyed by fire or other casualty, a just and
proportionate abatement of the Basic Annual Rent and Additional Rent (including
taxes and Operating Expenses) as provided in Articles 3 through 6 hereof, shall
be made according to the nature and extent of any impairment of TENANTS use of
the Leased Premises, until either the Building and the Leased Premises have been
restored or this Lease is terminated, all as hereinabove provided.

         15.3     Notwithstanding anything contained herein to the contrary,
LANDLORD shall have no obligation to clean, restore, rebuild, repair or replace
TENANTS furniture, furnishings, fixtures, decorations, partitions, equipment,
machinery, apparatus, systems, stock-in-trade, inventory, files, records,
papers, documents, alterations, additions, installations, changes, or other
improvements or property which may have been installed, placed, located,
constructed or made to, in, on or about the Leased Premises by or for TENANT,
the same being the sole risk, responsibility, cost and expense of TENANT except
that LANDLORD shall have the obligation to restore LANDLORD's Work.

         15.4     TENANT acknowledges and agrees that the provisions of this
Article 15 shall constitute the sole and exclusive remedies of TENANT in
connection with the events set forth herein, and TENANT further acknowledges and
agrees that the exercise of any such remedies, including without limitation the
termination of this Lease by either LANDLORD or TENANT, shall constitute a full
and complete settlement of any and all claims of and by TENANT.

                                     - 14 -

<PAGE>

         15.5     This Article 15 shall survive the termination of this Lease
and the term hereunder.

         16.      EMINENT DOMAIN.

         16.1     If the whole or any part of the Leased Premises or the
Property should be taken or condemned, in any manner, by exercise of the power
of eminent domain or sold to a taking or condemning authority under threat of
taking or condemnation, or shall receive any direct or consequential damage for
which LANDLORD or TENANT may be entitled to compensation by reason of anything
lawfully done in pursuance of any public or other authority (individually and
collectively a "TAKING"), then, except as hereinafter provided, this Lease shall
terminate at the election of LANDLORD provided that written notice is given to
TENANT within sixty (60) days of the date of the Taking, and such election may
be made in case of any Taking, even if the entire interest of LANDLORD shall
have been divested by the Taking. If LANDLORD shall not so elect, a just and
proportionate abatement of the Basic Annual Rent and Additional Rent (including
Taxes and Operating Expenses) as provided in Articles 3 through 6 hereof, shall
be made according to the nature and extent of any impairment of TENANT's use of
the Leased Premises, until the Leased Premises or what may remain thereof shall
have been restored as nearly as possible to its condition prior to the Taking.
In addition, Basic and Additional Rent for any portion of the Leased Premises so
taken shall be abated during the unexpired term of this Lease, effective when
the physical taking of said portion of the Leased Premises shall occur.

         16.2     In the event that the portion of the Building or Leased
Premises that is taken leaves the remainder unsuitable for use by TENANT for the
Permitted Uses, TENANT shall have the right to terminate this Lease by written
notice to LANDLORD no later than thirty (30) days after receipt by TENANT of
notice of such Taking.

         If this Lease is not terminated as aforesaid, LANDLORD shall diligently
repair and restore the Leased. Premises and the Building, but only to the extent
permitted by the net Taking award, to substantially the same condition they were
in prior to the Taking. In the event that LANDLORD fails to restore the Leased
Premises as above provided within two hundred seventy (270) days after such
Taking for whatever reason, including without limitation, insufficiency of
available Taking award, TENANT shall have the right to terminate this Lease by
written notice to LANDLORD prior to such restoration.

         16.3     LANDLORD reserves to itself, and TENANT assigns to LANDLORD,
all rights to damages and/or compensation that may accrue on account of any such
Taking, provided that TENANT shall have the right to claim and recover from the
Taking or condemning authority on account of any cost or loss due to removing
its materials, supplies, fixtures, equipment, relocation and moving expenses,
and any business interruption award. Subject to the aforementioned, TENANT
agrees to execute such further instruments of assignment of such damages and/or
compensation as LANDLORD may from time to time request, and to pay over to
LANDLORD any such damages and compensation that may be received by TENANT.

         16.4     This Article 16 shall survive the termination of this Lease
and of the term hereunder.

         17.      DEFAULT.

                                     - 15 -
<PAGE>

         Each of the following events shall be deemed to be an event of default
("EVENT OF DEFAULT") by TENANT under this Lease:

         (a)      If TENANT shall fail to pay any installment of Basic Annual
         Rent, additional rents or any other amounts or charges payable by
         TENANT under this Lease and such failure shall continue for a period of
         five (5) business days after notice thereof to TENANT.

         (b)      If TENANT, after notice specified in subsection 17(a) above
         having been given by LANDLORD twice in any twelve month period, shall
         fail during such twelve-month period to pay any installment of Basic
         Annual Rent, additional rents or any other amounts or charges payable
         to TENANT under this Lease on or before the date on which the same
         becomes due and payable.

         (c)      If TENANT shall fail to comply with any term, provision,
         condition or covenant of this Lease, other than those pertaining to the
         payment of money, and shall not cure such failure within fifteen (15)
         days after written notice thereof to TENANT; provided that if such
         default is curable but is of such a nature that the cure thereof cannot
         be completed within such period, TENANT shall not be deemed to be in
         default hereunder if TENANT commences such cure promptly upon receipt
         of such notice and diligently prosecutes the same to completion as
         reasonably promptly thereafter as possible.

         (d)      If TENANT fails to provide a replacement letter of credit
         within the timeframes required under Article 7 of this Lease.

         (e)      If TENANT shall make an assignment for the benefit of
         creditors, or if the estate created hereby shall be taken on execution
         or by other process of law.

         (f)      If TENANT shall file a petition under any section or chapter
         of the federal Bankruptcy Code, as amended from time to time, or under
         any similar law or statute of the United States or any State thereof
         pertaining to bankruptcy, insolvency or debtor relief, or TENANT shall
         have a petition or other proceedings filed against TENANT under any law
         or chapter thereof and such petition or proceedings shall not be
         vacated or set aside within sixty (60) days after such filing.

         (g)      If a receiver, guardian, conservator, trustee or other officer
         shall be appointed to take charge of all or any substantial part of the
         assets or property of TENANT and such appointment shall not be
         terminated and possession of such assets and property restored to
         TENANT within thirty (30) days after such appointment.

         18.      REMEDIES UPON DEFAULT.

         18.1     Upon the occurrence of any Event of Default by TENANT,
LANDLORD shall be entitled to all of the rights and remedies available to
LANDLORD at law or in equity, including without limitation the right to do any
one or more of the following:

         (a)      If the Event of Default by TENANT relates to the payment of
         any installment of Basic Annual Rent, additional rents or any other
         amounts or charges payable by

                                     - 16 -
<PAGE>

         TENANT hereunder, terminate this Lease by at least fourteen (14) days'
         notice to TENANT, or such other notice as may be permitted by any law
         now or hereafter in force, and recover from TENANT all rent and other
         amounts payable to LANDLORD under this Lease as of the date of
         termination.

         (b)      If the Event of Default does not relate to payments as stated
         in subsection 18.1(a), terminate this Lease by at least five (5) days
         notice.

         (c)      Enforce any and all lien rights and security interests.

         (d)      Terminate any and all subleases, licenses, concessions or
         other arrangements for possession entered into by TENANT and affecting
         the Leased Premises; or, at LANDLORD's option by notice to TENANT,
         succeed to TENANT's interest in any or all such subleases, licenses,
         concessions or arrangements, whereupon TENANT shall have no further
         right to or interest in the rent or other consideration receivable
         thereunder.

         (e)      Maintain an action to recover possession of the Leased
         Premises, with or without formal demand or re-entry.

         (f)      Enter into and upon the Leased Premises or any part thereof
         and repossess the same as of LANDLORD's former estate, and remove all
         persons and property therefrom without being guilty of any manner of
         trespass.

         18.2     The rights and remedies available to LANDLORD pursuant to
Section 18.1 of this Article 18, including those specifically enumerated and
those otherwise available to LANDLORD at law or in equity, shall be cumulative
and non-exclusive, and the exercise by LANDLORD of any such rights or remedies
shall not prevent LANDLORD from exercising any other such tight or remedy. In no
event will LANDLORD's exercise of any right or remedy provided for by this
Article 18 terminate this Lease unless and until accompanied by LANDLORD's
notice of termination to TENANT.

         18.3     No waiver by LANDLORD or TENANT of any violation, breach or
default of any of the terms, provisions, conditions and covenants herein
contained shall be deemed or construed to constitute a waiver of any other or
later violation, breach, or default of the same or any other of the terms,
provisions conditions and covenants herein contained. Forbearance by LANDLORD in
enforcement of one or more of the remedies herein provided to LANDLORD following
the occurrence of any default, whether or not known to LANDLORD, shall not be
deemed a waiver of any such default.

         18.4     TENANT covenants and agrees, notwithstanding any such
termination, entry or re-entry by LANDLORD, by any means whatsoever, to pay and
be liable for, on the days originally fixed herein for the payment thereof,
amounts equal to the several installments of Basic Annual Rent, additional rents
and other amounts and charges reserved as would, under the terms of this Lease,
become due if this Lease had not been terminated or if LANDLORD had not entered
or re-entered, as aforesaid, and whether the Leased Premises be relet or remain
vacant, in whole or in part. In the event the Leased Premises, or any part
thereof, be relet by LANDLORD, TENANT shall be entitled to a credit in the net
amount of rent received by LANDLORD in reletting, after deduction of all
reasonable costs and expenses incurred in reletting the Leased

                                     - 17 -
<PAGE>

Premises, or any part thereof, (including, without limitation, remodeling,
alteration and improvement costs and expenses, attorneys' and brokerage fees,
and the like) and in collecting the rent therewith, in the following manner:

         (a)      Amounts received by LANDLORD from TENANT after reletting shall
         first be applied against such costs and expenses of LANDLORD, until the
         same are completely recovered, and until such recovery, TENANT shall
         pay, as of each day when a payment would fall due under this Lease,
         the amount which TENANT is obligated to pay under the terms of this
         Lease (TENANT's liability prior to any such reletting and such recovery
         not in any way to be diminished as a result of the fact that reletting
         might be for Basic Annual Rent, additional rents or other amounts and
         charges higher than those provided for in this Lease); when and if such
         costs and expenses have been completely recovered, the amounts received
         thereafter by LANDLORD from reletting shall be credited against
         TENANT's obligations as of each day when a payment would fall due under
         this Lease, and only the net amount, if any, remaining to be paid shall
         be payable by TENANT, provided, however, that no credit of any kind
         shall be due for any period after the date when the term of this Lease
         would otherwise expire according to its terms.

         (b)      As an alternative, at the election and in the sole discretion
         of LANDLORD, TENANT shall, upon termination or at any time thereafter,
         pay to LANDLORD, as damages, such a sum as at such time represents the
         present value (using a discount rate selected by LANDLORD in its
         reasonable discretion) of the amount of the excess, if any, of (i) the
         total rent and other benefits which would have accrued to LANDLORD
         under this Lease for the remainder of the term of this Lease if the
         terms, provisions, conditions and covenants of this Lease had been
         fully complied with by TENANT, over and above (ii) the cash rental
         value (in advance) of the Leased Premises for the balance of such term.
         For the purposes of this Subsection 18.4(b), if LANDLORD elects to
         require TENANT to pay damages in accordance with the immediately
         preceding sentence, such total rent shall be computed by assuming that
         TENANTs share of real estate taxes and Operating Expenses would be, for
         each year of the balance of the unexpired term of this Lease, the
         amount thereof (if any) payable by TENANT to LANDLORD for the
         immediately preceding Lease Year.

         (c)      As a further alternative, at the election and in the sole
         discretion of LANDLORD, TENANT shall, upon termination or at any time
         thereafter, pay to LANDLORD, as liquidated damages, an amount equal to
         the aggregate of the Basic Annual Rent and all additional rent owed for
         the six month period prior to the termination of the Lease.

         18.5     Without limiting any of LANDLORD's rights and remedies under
this Lease and in addition to all other amounts TENANT is otherwise obligated to
pay, LANDLORD shall be entitled to recover from TENANT all reasonable costs and
expenses, including reasonable attorneys' fees, incurred by LANDLORD in
enforcing this Lease.

         18.6     If TENANT shall default in the performance or observance of
any term or condition in this Lease and shall not cure such default within the
period for curing such default specified in Article 17, or if no period for cure
is specified then within ten (10) days after notice from LANDLORD specifying the
default, LANDLORD may, but shall not be obligated to, cure

                                     - 18 -
<PAGE>

such default by TENANT under this Lease. If LANDLORD elects to cure a default of
TENANT, all costs and expenses incurred by LANDLORD, including reasonable
attorneys' fees in curing a default shall be considered additional rent
hereunder and shall be paid by TENANT to LANDLORD on demand, together with
interest thereon from the date of payment by LANDLORD to the date of payment by
TENANT at a rate which is at all times five percent (5%) in excess of the
so-called "Base Rate", in effect from time to time at BankBoston, N.A. or its
successor.

         18.7     If repairs are required to be made by LANDLORD pursuant to the
terms hereof and such repairs are due to the roof of the Building leaking into
the Leased Premises and LANDLORD refuses or neglects to commence such repairs
and complete the same with reasonable dispatch after written request by TENANT,
TENANT may (but shall not be required to do so) make or cause such repairs to be
made and shall not be responsible to LANDLORD for any loss or damage that may
accrue to LANDLORD by reason thereof. If TENANT makes or causes such repairs to
be made, LANDLORD agrees that LANDLORD shall forthwith, on demand, pay to TENANT
the actual, out-of-pocket third party costs therefor together with interest
thereon from the date of such expenditure by TENANT to the date of payment by
LANDLORD at a rate which is at all times five percent (5%) in excess of the
so-called "Base Rate", in effect from time to time at Fleet National Bank or its
successor.

         18.8     This Article 18 shall survive the expiration or earlier
termination of this Lease and the term hereunder.

         19.      SURRENDER OF LEASED PREMISES; REMOVAL OF PROPERTY.

         19.1     No act or thing done by LANDLORD or any officer, director,
trustee, employee, servant, agent or contractor of LANDLORD during the term
hereof shall be deemed to constitute an acceptance by LANDLORD of a surrender of
the Leased Premises unless such intent is specifically acknowledged in a writing
signed by LANDLORD. The delivery of keys to the Leased Premises to LANDLORD or
any officer, director, trustee, employee, servant, agent or contractor of
LANDLORD shall not constitute a surrender of the Leased Premises or effect a
termination of this Lease, whether or not the keys are thereafter retained by
LANDLORD. The voluntary surrender of the Leased Premises by TENANT, whether
accepted by LANDLORD or not, or a mutual termination of this Lease, shall not
work a merger, and at the option of LANDLORD shall operate as an assignment to
LANDLORD of all subleases or subtenancies affecting the Leased Premises.

         19.2     Upon the expiration of the term of this Lease, or upon any
earlier termination of this Lease, TENANT shall quit and surrender possession of
the Leased Premises to LANDLORD in as good order and condition as when TENANT
took possession and as thereafter improved by LANDLORD and/or TENANT,
reasonable wear and tear (which shall not be deemed to include holes in floors,
walls or ceilings or special wiring caused by the installation or removal of
TENANTs furnishings, furniture, equipment, machinery, systems, appliances,
apparatus and appurtenances) and damage due to fire or eminent domain only
excepted. Upon such expiration or termination, TENANT shall, without expense to
LANDLORD, remove or cause to be removed from the Leased Premises all debris and
rubbish, and all items of furniture, equipment, machinery, systems, appliances,
apparatus and other articles of personal property belonging to

                                     - 19 -
<PAGE>

TENANT or installed or placed by TENANT in the Leased Premises, and such similar
articles of any other persons claiming under TENANT, and TENANT shall repair at
its sole cost and expense all damage to the Leased Premises and Property
resulting from such removal.

         19.3     If at the expiration or earlier termination of this Lease,
TENANT shall fail to remove from the Leased Premises any property which TENANT
shall be required under this Lease to remove, LANDLORD may, at its option and
without prejudice to any other rights LANDLORD may have against TENANT on
account thereof, remove and store in any public warehouse or elsewhere in the
name and at the risk and the sole expense of TENANT any or all such property
and/or sell at public or private sale without notice any or all such property
and apply the net proceeds of such sale to the payment of any sums due
hereunder, and LANDLORD shall not be liable to TENANT or any other person in any
manner whatsoever by reason of such removal or sale or any thing done in
connection therewith, except to apply the net proceeds of any such sale as
aforesaid.

         19.4     All fixtures, Alterations and/or appurtenances attached to or
built into or on or about the Leased Premises, except for lighting products
produced by TENANT, prior to or during the term hereof, whether by LANDLORD at
its expense or at the expense of TENANT, or by TENANT at its expense, or by
previous occupants of the Leased Premises, shall be and remain part of the
Leased Premises and shall not be removed by TENANT at the expiration or earlier
termination of this Lease. Such fixtures, alterations, additions, installations,
changes, repairs, improvements and/or appurtenances shall include, without
limitation, floor coverings, paneling, molding, doors, plumbing systems,
electrical systems, lighting systems, all fixtures and outlets for the systems
mentioned above and for all telephone, radio, telegraph and television purposes,
and any special floor, wall and ceiling installations. Notwithstanding the
foregoing, and except for TENANT Work, LANDLORD may, in its sole discretion,
require TENANT, at TENANT's sole cost and expense, to remove any fixtures,
Alterations and/or appurtenances attached to or built into or on or about the
Leased Premises by TENANT after the Commencement Date provided that in
accordance with the provisions of Section 12.3 LANDLORD shall have included such
removal requirement in LANDLORD's consent to the installation thereof, and to
repair any damage to the Building and Leased Premises occasioned by the removal
of any of the foregoing. If TENANT shall fail to complete such removal and
repair such damage, LANDLORD may do so and may charge the reasonable cost
thereof to TENANT.

         19.5     This Article 19 shall survive the expiration or earlier
termination of this Lease and the term hereunder.

         20.      COSTS OF SUIT/ATTORNEYS' FEES.

         20.1     If TENANT or LANDLORD shall bring any action for any relief,
declaratory or otherwise, against the other arising out of or under this Lease,
or in any way relating to the Leased Premises or the Property including without
limitation any suit by LANDLORD for the recovery of any installment of Basic
Annual Rent, additional rents, or other amounts or charges payable by TENANT
under this Lease, or for the recovery of possession of the Leased Premises, the
losing party shall pay the successful party its costs of suit, including,
without limitation, a reasonable sum for attorneys' fees in such suit, upon the
obtaining of a final settlement or a final unappealable judgment.

                                     - 20 -
<PAGE>


         20.2     LANDLORD and TENANT hereby each waive trial by jury in any
action, proceeding or counterclaim brought by either against the other, on or in
respect of any matter whatsoever arising out of or in any way connected with
this Lease, the relationship of LANDLORD and TENANT or TENANT's use or occupancy
of the Leased Premises.

         20.3     In the event that LANDLORD shall, without fault on LANDLORD's
part, be made party to any litigation or arbitration instituted by TENANT or by
any third party against TENANT, or by or against any person holding under or
using the Leased Premises by license of TENANT, or for the foreclosure of any
lien for labor or material furnished to or for TENANT or any such other person
or otherwise arising out of or resulting from any action or transaction of
TENANT or of any such other person, TENANT hereby indemnifies and holds LANDLORD
harmless from and against any judgment rendered against LANDLORD or the Property
or any part thereof, and all costs and expenses, including reasonable attorneys'
fees, incurred by LANDLORD in connection with such litigation and arbitration.

         20.4     This Article 20 shall survive the expiration or earlier
termination of this Lease and the term hereunder.

         21.      ASSIGNMENT AND SUBLETTING.

         21.1     Except as hereinafter provided, TENANT shall not sublet (which
term shall include, without limitation, the granting of concessions, licenses
and the like) all or any part of the Leased Premises nor assign this Lease
unless, in each instance, the prior written consent of LANDLORD thereto has been
obtained, which consent shall not be unreasonably conditioned, withheld or
delayed. Without in any way limiting the generality of the previous sentence,
unless LANDLORD has no comparable space which is available for leasing in the
Building, TENANT shall not assign or sublet any part of the Leased Premises to
(i) any other tenant in the Building, (ii) any party with whom LANDLORD is
actively negotiating for space in the Building, or (iii) any party at rent lower
than what LANDLORD is charging for comparable space in the Building; nor shall
TENANT advertise the rent requested. TENANT may, subject to the terms,
provisions, conditions and covenants of this Lease but without LANDLORD's
consent, sublet all of the Leased Premises or assign this Lease to any entity
controlling, controlled by or under common control with TENANT. Neither this
Lease nor the Leased Premises, or any part thereof, shall be mortgaged by
TENANT, nor shall TENANT mortgage, assign, pledge or otherwise transfer the
interest of TENANT in and to any sublease or the rentals payable thereunder. Any
such mortgage and any such sublease, assignment, pledge or transfer made in
violation of this Section 21.1 shall be void and at LANDLORD's election shall
terminate this Lease. Notwithstanding anything to the contrary provided in this
Lease, LANDLORD's prior consent shall not be required in connection with an
assignment of TENANT's interest in this Lease as a result of a merger or
consolidation of TENANT, or a sale of all or substantially all of TENANT's
assets.

         21.2     It shall be a condition of the validity of any assignment or
sublease (i) that the assignee or subtenant agree in writing directly with
LANDLORD, in substance and form satisfactory to LANDLORD, to be bound by all the
obligations of TENANT hereunder, and (ii) that TENANT shall agree in writing, in
substance and form satisfactory to LANDLORD, to pay to LANDLORD fifty percent
(50%) of any and all amounts and consideration received at any time by TENANT
from or on behalf of the assignee or subtenant in excess of (i) the Basic

                                     - 21 -
<PAGE>



Annual Rent and Additional Rent, attributable to that portion of the Leased
Premises so assigned or sublet, and (ii) all reasonable costs and expenses
incurred by TENANT in connection with such assignment or sublease, including
brokers' fees, legal fees and the cost of improvements to the Leased Premises
whether received by TENANT in the form of rent, additional rent, lump sum or
installment payments or otherwise, for the entire period of such assignment or
sublease, or any part thereof.

         21.3     No such assignment or subletting shall relieve TENANT named
herein of any of the obligations of TENANT hereunder, but TENANT named herein
shall remain fully liable for the obligations of TENANT hereunder, including,
without limitation, the obligation to pay Basic Annual Rent, additional rents
and other amounts and charges provided for in this Lease.

         21.4     TENANT shall, upon demand, reimburse LANDLORD for the
reasonable legal fees and expenses incurred by LANDLORD in connection with any
assignment or subletting of the Leased Premises, or any part thereof, and any
request by TENANT therefor.

         21.5     TENANT shall provide written notice to LANDLORD of TENANT's
intention to assign or sublet any or all of the Leased Premises. Such notice
shall specify with particularity the terms of the proposed assignment or
sublease, and LANDLORD shall have twenty-one (21) days to respond.

         21.6     If TENANT's request for assignment or subletting is for space
greater than or equal to twenty-five percent (25%) of the Leased Premises,
LANDLORD shall have the right to terminate this Lease with respect to said space
as of the commencement date of said sublease. In the event of a recapture by
LANDLORD, if this Lease shall be canceled with respect to less than the entire
Leased Premises, the Basic Annual Rent, Tenant's Tax Share and Tenant's Expense
Share shall be adjusted on the basis of the number of rentable square feet
retained by TENANT in proportion to the number of rentable square feet contained
in the original Leased Premises, and this Lease as so amended shall continue
thereafter in full force and effect, and upon request of either party, the
parties shall execute written confirmation of same. If LANDLORD recaptures only
a portion of the Leased Premises, it shall construct and erect at its sole cost
such partitions as may be required to sever the space to be retained by TENANT
from the space recaptured by LANDLORD. LANDLORD may, at its option, lease any
recaptured portion of the Premises to the proposed subtenant or assignee or to
any other person or entity without liability to TENANT. TENANT shall not be
entitled to any portion of the profit, if any, LANDLORD may realize on account
of such termination and reletting.

         22.      TRANSFER OF LANDLORD'S INTEREST.

         In the event of any transfer of LANDLORD's interest in the Property,
other than a transfer for security purposes only, the transferor shall be
automatically relieved of any and all obligations and liabilities on the part of
LANDLORD accruing from and after the date of such transfer, including, without
limitation, the obligation of LANDLORD to return the Security Deposit as
provided in this Lease, provided that the transferor shall transfer any Security
Deposit then held by LANDLORD, or any portion thereof remaining after proper
deductions therefrom, to the transferee.

                                     - 22 -
<PAGE>



         23.      HOLDING OVER.

         23.1     In the event TENANT holds, occupies or detains the Leased
Premises or any part thereof after the expiration or earlier termination of this
Lease, with or without the express or implied consent of LANDLORD, TENANT shall
be deemed a tenant-at-sufferance only, and such tenancy-at-sufferance shall not
constitute a renewal hereof or an extension for any further term or the creation
of a tenancy-at-will, and in such event, TENANT shall pay to LANDLORD on the
first day of each month in advance basic monthly rent in an amount equal to 150%
the amount of the monthly installment of Basic Annual Rent, as provided in
Article 3 hereof for the last full month of the tenancy hereunder. In addition,
TENANT shall be liable to LANDLORD for any and all damages, excluding
consequential damages, suffered by LANDLORD as a result of such holding over.
Such tenancy-at-sufferance shall be subject to every other term, provision,
condition, covenant and agreement contained herein, including without limitation
the obligation of TENANT to pay the additional rents as provided in this Lease.
Nothing contained in this Section 23.1 shall be construed as consent by LANDLORD
to any holding over by TENANT and LANDLORD expressly reserves the right to
require TENANT to surrender possession of the Leased Premises to LANDLORD as
provided in this Lease upon the expiration or earlier termination of this Lease,
to commence suit at any time to recover possession of the Leased Premises and
recover all installments of Basic Annual Rent, additional rents and other
amounts and charges due hereunder, and to apply payments received by LANDLORD
from TENANT on account and not as payment in full or in accord and satisfaction.

         23.2     This Article 23 shall survive the expiration or earlier
termination of this Lease and the term hereunder.

         24.      NOTICES.

         In every case when, under the provisions of this Lease, it shall be
necessary or desirable for one party hereto to serve any notice or demand on the
other, such notice or demand shall be in writing and shall be served personally
or by deposit in the United States mail, postage fully prepaid, registered or
certified mail, with return receipt, addressed as follows: (A) If to LANDLORD:
RAK Old South Associates Limited Partnership, c/o RAK, 140 West 57th Street, New
York, New York 10019, with a copy to Cushman & Wakefield, 101 Arch Street, 21st
Floor, Boston, Massachusetts 02110; and (B) if to TENANT: Addressed to TENANT at
the Leased Premises.

         LANDLORD or TENANT may, from time to time, by notice in writing served
upon the other as aforesaid, designate a different mailing address or a
different person to whom all such notices or demands are thereafter to be
addressed. Service of any such notice or demand if given personally shall be
deemed complete upon delivery, and if made by mail shall be deemed complete on
the day of actual delivery as shown by the addressee's registry or certification
receipt.

         25.      QUIET ENJOYMENT.

         LANDLORD covenants that TENANT, upon timely paying each and every
installment of Basic Annual Rent, additional rents and other amounts and charges
payable under this Lease

                                     - 23 -
<PAGE>

and performing each and every term, provision, condition, covenant and agreement
of this Lease on TENANT's part to be performed, shall and may peaceably and
quietly have, hold and enjoy the Leased Premises for the term of this Lease.

         26.      COMPLIANCE WITH LAW.

         TENANT shall comply with all laws, statutes, ordinances, rules,
regulations, orders and directives of governmental and quasi-governmental bodies
and authorities having jurisdiction over TENANT and TENANT's use of the Leased
Premises, from time to time, and shall obtain and keep in effect all licenses,
permits, approvals and other authorizations required with respect to the
business or businesses conducted by TENANT at, within or from the Leased
Premises. Nothing herein shall require TENANT to comply with Laws or
requirements of public authorities which require the installation of new or
additional mechanical, electrical, plumbing or fire/life safety systems on a
Building-wide basis without reference to the particular use of TENANT or any
Alterations performed by TENANT subsequent to the Commencement Date (the
"BUILDING-WIDE LAWS"). LANDLORD will, at LANDLORD's expense except to the extent
properly included in Operating Expenses, perform all acts necessary to comply
with such Building-Wide Laws as the same affect the Leased Premises and the
Building. TENANT shall not bring or permit to be brought or kept in or on the
Leased Premises or elsewhere in the Building or Property any hazardous, toxic,
flammable, combustible or explosive fluid, material, chemical or substance
including, without limitation, any item defined as hazardous pursuant to Chapter
21E of the Massachusetts General Laws except for small quantities of household
cleaning agents and the like, all of which TENANT agrees to handle and dispose
of in accordance with all applicable laws. TENANT shall be responsible for
compliance with requirements imposed by the Americans with Disabilities Act or
any similar law relative to TENANT's use of the Leased Premises, and any work
performed by TENANT in the Leased Premises after completion by LANDLORD of
LANDLORD's Work and by TENANT's contractor of TENANT's Work. TENANT and its
officers, directors, partners, employees, servants, agents, contractors,
licensees and invitees ("TENANT'S REPRESENTATIVES") shall also comply with all
reasonable rules and regulations which LANDLORD may adopt from time to time for
the protection and welfare of the Building and its tenants and occupants which
rules and regulations shall be applied equally to all tenants and occupants of
the Building. LANDLORD shall have no liability to TENANT for the failure of any
other tenant in the Building to observe the law or any statute, ordinance, rule,
regulation, order or directive.

         27.      ESTOPPEL CERTIFICATE BY TENANT.

         At any time and from time to time, upon not less than ten (10) business
days' prior written request by LANDLORD, TENANT shall execute, acknowledge and
deliver to LANDLORD a statement in writing certifying that this Lease is
unmodified and in full force and effect, if such be the case (or if there have
been modifications, that this Lease is in full force and effect as modified, if
such be the case, and stating the modifications), that, if such be the case,
TENANT has no right of reduction, abatement or set-off against the rent or any
other charge payable to LANDLORD, the amount of any security deposited by
TENANT, the dates to which the Basic Annual Rent, additional, rents and other
amounts and charges have been paid in advance, any increases or decreases of
rent that are anticipated and any other information set forth on Exhibit C
hereto or as reasonably requested by LANDLORD, it being intended that any

                                     - 24 -
<PAGE>

such statement delivered pursuant to this Section 27.1 may be relied upon by any
purchaser of the fee or mortgagee or beneficiary or assignee of any mortgage or
trust deed upon the fee of the Property or Leased Premises.

         At any time and from time to, time, upon not less than ten (10)
business days' prior written request by TENANT, LANDLORD shall execute,
acknowledge and deliver to TENANT a statement in writing certifying that this
Lease is unmodified and in full force and effect, if such be the case, or if
there have been modifications, that this Lease is in full force and effect as
modified, if such be the case, and stating the modifications. Such statement may
include the amount of any security deposited by TENANT, the dates to which the
Basic Annual Rent, Additional Rents and other amounts and charges have been paid
in advance, and any other information set forth on Exhibit C hereto or as
reasonably requested by TENANT, it being intended that any such statement
delivered pursuant to this Section may be relied upon by any successor or assign
of TENANT.

         28.      SUBORDINATION, ATTORNMENT, AND NON-DISTURBANCE.

         This Lease is and at all times shall be subject and subordinate to any
ground or underlying leases, mortgages, trust deeds or like encumbrances, which
now affect the Property or Leased Premises, and to all renewals, modifications,
consolidations, replacements and extensions thereof. This Lease is and at all
times shall be subject and subordinate to any ground or underlying leases,
mortgages, trust deeds or like encumbrances, which may hereafter affect the
Property or the Leased Premises, and to all renewals, modifications,
consolidations, replacements and extensions thereof, provided the holder
thereof, upon request by TENANT, shall provide TENANT with a non-disturbance
agreement in customary form. Upon receipt thereof, TENANT shall, at the request
of LANDLORD or any party to a ground or underlying lease or any holder of a note
secured by a mortgage or like encumbrance, execute any certificate or document
reflecting the subordination of this Lease to such ground or underlying lease or
to the lien of any mortgage or like encumbrance now or hereafter placed upon the
Property. In the event of the sale of the Property upon foreclosure or upon the
exercise of a power of sale, or by transfer in lieu of foreclosure, TENANT
agrees, (i) the liability of the mortgagee, trustee, transferee or purchaser at
such foreclosure sale and the liability of a subsequent owner (all of the
foregoing parties are collectively referred to as the "Mortgagee") shall exist
only with respect to the period during which the Mortgagee is the owner of the
Building and the Mortgagee shall be released from any further liability upon its
transfer of ownership, (ii) the Mortgagee shall not have any liability
whatsoever for the acts of LANDLORD prior to any such transfer nor any liability
for any deposits made by TENANT hereunder unless the Mortgagee has received such
deposits, and (iii) upon the written request of the Mortgagee, TENANT shall
attorn to the Mortgagee and recognize the Mortgagee as the LANDLORD under this
Lease and to continue to be bound by the terms of this Lease.

         If any act or omission by LANDLORD would give TENANT the right to
damages from LANDLORD or any rights with respect to this Lease, TENANT will not
sue for such damages or exercise any such rights until (i) it shall have given
written notice of the act or omission to LANDLORD and to the holder(s) of the
indebtedness or other obligations secured by any mortgage or deed of trust
affecting the fee interest, if the name and address of such holder(s) have been
furnished to TENANT; and (ii) a reasonable period of time (in light both of the
time

                                     - 25 -
<PAGE>

required to cure the act or omission and the effect of the act or omission on
TENANT's business operations in the Leased Premises) to cure the act or omission
has elapsed following the giving of the notice, during which time LANDLORD and
such holder(s), or either of them, their agents or employees, will be entitled
to enter upon the Leased Premises and do therein whatever may be necessary to
cure the act or omission.

         Upon request by TENANT, LANDLORD will use commercially reasonable
efforts to obtain a non-disturbance agreement in favor of TENANT from all
holders of fee mortgages on the Property on the date thereof.

         29.      RIGHTS RESERVED TO LANDLORD.

         29.1     All portions of the Building are reserved to LANDLORD
including exterior building walls, core corridor walls and doors and any core
corridor entrance, but excluding the Leased Premises and the inside surfaces of
all walls, windows and doors bounding the Leased Premises. LANDLORD also
reserves any space in or adjacent to the Leased Premises used for shafts,
stacks, pipes, conduits, fan rooms, ducts, electric or other utilities, sinks or
other building facilities, and the use thereof, as well as the right to access
thereto through the Leased Premises for the purposes of operation, maintenance,
replacement and repair.

         29.2     Without in any way limiting LANDLORD's other rights, LANDLORD
shall have the following rights exercisable without notice and without effecting
an eviction or disturbance of TENANT's use or possession or giving rise to any
claim for reduction, set-off or abatement of rent:

         (a)      To enter the Leased Premises at all reasonable times during
         the term of this Lease for the purposes of inspecting and cleaning the
         same, performing such maintenance and repair as may be required or
         permitted of LANDLORD hereunder, and within the last year of the Term,
         exhibiting the Leased Premises to prospective tenants, purchasers or
         others; provided that LANDLORD shall use reasonable efforts not to
         disturb TENANT's use and occupancy.

         (b)      To change the name or street address of the Leased Premises or
         the Property.

         (c)      To install and maintain signs on the exterior and interior of
         the Building, except within the Leased Premises.

         (d)      To have pass keys to the Leased Premises.

         (e)      To have access to all mail chutes according to the rules of
         the United States Postal Service.

         (f)      To do or permit to be done any work to, in, on, or about the
         Building or Property or any adjacent or nearby building, land, street
         or alley.

         (g)      To grant to anyone the exclusive right to conduct any business
         or render any service in the Building, provided such exclusive right
         shall not operate to exclude TENANT from the use expressly permitted
         under this Lease.

                                     - 26 -
<PAGE>

         29.3     TENANT shall follow the Rules and Regulations for the Building
set forth in Exhibit D hereto.

         30.      FORCE MAJEURE CLAUSE.

         Wherever there is provided in this Lease a time limitation for
performance by LANDLORD or TENANT of any construction, repair, maintenance or
service, the time provided for shall be extended for as long as and to the
extent that delay in complying with such limitation is due to an act of God,
governmental control, interruption caused by strikes, lockouts, labor
controversies, fires or other casualties, accidents, injuries, or other factors
beyond the reasonable control of LANDLORD or TENANT, respectively ("FORCE
MAJEURE").

         31.      INDEMNITY AND INSURANCE

         31.1     TENANT hereby indemnifies and holds LANDLORD, its trustees,
directors, partners, officers, employees, servants, agents and contractors
(including without limitation its property managers, and any affiliates thereof,
and their respective officers, directors, trustees, partners, employees,
servants, agents and contractors) ("LANDLORD'S REPRESENTATIVES") harmless of,
from and against any and all actions, causes of action, claims, costs, damages,
debts, demands, expenses, liens, losses, injuries, judgments, fines, penalties
and any and all liabilities whatsoever, of every name and nature, including
without limitation reasonable attorneys' fees, whether on account of injury to
persons (including death) or property or otherwise, caused by, arising out of or
resulting from the use of the Leased Premises or the Building or the Property by
TENANT or TENANT's Representatives or the conduct of TENANT's business, trade or
profession, or any activity, work or thing done, permitted or suffered by TENANT
in, on, or about the Leased Premises or the Building or the Property, or any
breach or default in the performance of any obligation on TENANT's part to be
performed under the terms of this Lease, or any act or omission on the part of
TENANT or TENANT's Representatives, excepting only as the same may arise from
the negligence or willful misconduct of LANDLORD; and TENANT hereby agrees to
and shall defend LANDLORD and LANDLORD's Representatives against the same, at
TENANT's sole cost and expense including without limitation the payment by
TENANT of the reasonable fees, disbursements and expenses of attorneys, to be
approved by LANDLORD, retained in such defense. This Section 31.1, shall survive
the termination or expiration of this Lease with respect to any and all matters
occurring during the term hereof, or any extension or renewal thereof, or any
further period during which TENANT shall hold the Leased Premises as a
tenant-at-will or tenant-at-sufferance.

         31.2     TENANT agrees to maintain at its sole cost and expense in full
force, from the date on which TENANT first enters the Leased Premises for any
reason and thereafter throughout the term hereof, (i) "all risk" property
insurance covering all present and future articles of personal property and
business machinery, equipment and furniture and any improvements or betterments
owned or installed by TENANT in the Leased Premises (collectively, "TENANT'S
REMOVABLE PROPERTY") to a limit of not less than the full replacement cost
thereof; and (ii) a policy of Commercial General Liability insurance with broad
form coverage. The minimum limits of such liability insurance shall be
$3,000,000.00 per occurrence for personal injury (including death) and
$3,000,000.00 per occurrence for property damage.

                                     - 27 -
<PAGE>

         Such liability policy shall also include, but shall not be limited to,
the following extensions of coverage:

                  i)       contractual liability, covering TENANT's liability
                           under this Lease; and

                  ii)      personal injury liability in the annual aggregate
                           amount set forth in this section, expressly deleting
                           the exclusion relating to contractual assumptions of
                           liability if the base policy contains such an
                           exclusion.

         31.3     Without hereby implying any authorization therefor, if at any
time any alcoholic beverages of any nature are served or consumed in, on, or
about the Leased Premises, TENANT shall maintain a liquor liability insurance
policy with a limit of not less than $1,000,000.00.

         31.4     TENANT shall maintain worker's compensation insurance with
minimal limits of $1,000,000.00 per accident and per disease per employee.

         31.5     All such insurance shall become effective no later than the
Commencement Date, shall be maintained for the term of this Lease and any
further period during which TENANT holds the Leased Premises, or any part
thereof, as a tenant-at-will or tenant-at-sufferance, shall, except for
insurance with respect to TENANT's personal property, name LANDLORD, and its
property managers, affiliates and the holders of any mortgage, deed of trust or
like encumbrance, and the lessors under any underlying lease, as additional
insureds and shall otherwise be satisfactory to LANDLORD in all respects. TENANT
shall furnish LANDLORD with certificates of the policy or policies of such
insurance on the Commencement Date and thereafter TENANT shall furnish to
LANDLORD such evidence of the coverage required hereunder as LANDLORD may from
time to time request.

         31.6     TENANT agrees to use and occupy the Leased Premises and to use
such other portions of the Property as TENANT may be entitled to hereunder at
TENANT's own risk and LANDLORD shall have no responsibility or liability for any
loss or damage to TENANT's Removable Property for any reason whatsoever. TENANT
hereby waives and releases LANDLORD from any and all liabilities, claims and
losses on account of damage to TENANT's Removable Property for which LANDLORD is
or may be held liable to the extent TENANT either is required to maintain
insurance pursuant to Section 31.2 or actually receives insurance proceeds on
account thereof. LANDLORD hereby waives and releases TENANT from any and all
liabilities, claims and losses on account of damage to the Property or Leased
Premises for which TENANT is or may be held liable to the extent LANDLORD is
required to maintain insurance pursuant to this Lease or actually receives
insurance proceeds on account thereof. Each party hereto shall secure waiver of
subrogation endorsements from their respective insurance carriers.

         31.7     TENANT shall not suffer or permit any condition increasing the
premium of, and shall not violate or permit to be violated any of the policies
of, insurance carried by LANDLORD and brought to the notice of TENANT.

         31.8     For each policy of insurance required to be maintained by
TENANT hereunder, the following parties shall be named as additional insureds:
LANDLORD and RAK Group LLC, the managing agent.

                                     - 28 -
<PAGE>

         31.9     Throughout the Term, LANDLORD shall insure the Building of
which the Leased Premises are a part, and all tenant improvements therein which
are considered to be part of the Building, against loss due to fire and other
casualties included in standard "all risk" insurance policies, in an amount
equal to at least 100% of the replacement cost thereof, exclusive of footings
and foundations, with a deductible per occurrence which shall be commercially
reasonable. For purposes hereof, the term "commercially reasonable" shall refer
to the deductible amount (per occurrence) generally carried in similar insurance
policies obtained by other landlords in buildings and locations similar to the
Property.

         32.      EXPANSION OPTION.

         32.1     By giving written notice to LANDLORD on or before July 1,
2000, TENANT shall have the right to expand the Leased Premises to include the
tenth floor of the Building which consists of approximately 20,271 square feet
of additional rentable area. TENANT's notice exercising this option to-expand
shall specify whether the expansion shall be effective on January 1, 2001 (i) as
to the entire tenth floor or (ii) only as to approximately 9,000 square feet,
with June 1, 2001 being the effective date for the remaining space on the tenth
floor. Basic Annual Rent and additional rent for this expansion will commence
upon the substantial completion of the tenth floor (or the substantial
completion of the designated portion of the tenth floor if the expansion is
occurring in two steps) where substantial completion shall mean that, with the
exception of punch-list items, TENANT's buildout shall have been completed in
accordance with the plans referenced below and a certificate of occupancy for
the expansion space shall have been issued. TENANT's right to exercise the
expansion option shall be ineffective unless the following conditions have been
satisfied:

         (a)      TENANT shall not currently be in default under this Lease; and

         (b)      TENANT shall have delivered an additional $1,000,000.00
         Security Deposit in the form of cash or a letter of credit as set forth
         in Article 7 hereof (but upon TENANT's raising an additional
         $10,000,000.00 in equity financing after the date hereof, the
         additional Security Deposit shall be reduced to $500,000.00); and

         Failure of the TENANT to satisfy all of the above conditions and to
exercise the option to expand by July 1, 2000 will extinguish the TENANT's right
to exercise the option to expand. In the event that TENANT effectively exercises
the option to expand, the terms and conditions of this Lease shall apply to such
additional space, TENANT shall receive an additional Buildout Allowance of
$30.00 per square foot. Basic Annual Rent for the expansion space shall be at
the same cost per square foot as the space on the eleventh floor initially
comprising the Leased Premises. Tenant's Tax Share shall be increased
appropriately to reflect the square footage of the Leased Premises divided by
the square footage of the Building, which is currently 202,267 square feet.
Tenant's Expense Share shall be increased appropriately to reflect the square
footage of the Leased Premises divided by the non-retail square footage of the
Building, which is currently 185,995 square feet. TENANT shall deliver to
LANDLORD plans for the interior finish and other improvements to the tenth
floor, prepared at TENANT's own expense, on or before September 1, 2000.

         32.2     If at any time during the term of this Lease after September
1, 2000 contiguous

                                     - 29 -
<PAGE>

(i.e. below or adjacent) space becomes available in the Building, LANDLORD shall
first offer such space to TENANT subject to the rights of existing tenants of
such contiguous space and provided that the TENANT has exercised its expansion
option and is currently renting the tenth floor of the Building. If TENANT
responds negatively or does not respond within fifteen (15) days of LANDLORD's
offer, LANDLORD may offer the space to third parties. If TENANT responds
affirmatively within such fifteen (15) day period, LANDLORD and TENANT shall
promptly amend this Lease to account for the additional rental space. The rent
for such contiguous space shall be the Prevailing Market Rent.

         33.      MISCELLANEOUS.

         33.1     No receipt of money by LANDLORD from TENANT after the
termination of this Lease, the service of any notice or demand, or the
commencement of any suit or final judgment for possession, shall reinstate,
continue or extend the term of this Lease or effect any such notice, demand,
suit or judgment.

         33.2     If any provision of this Lease or its application to any
person or circumstances shall be determined by any court of competent
jurisdiction to be invalid or unenforceable to any extent, the remainder of this
Lease or the application of such provision to persons or circumstances other
than those as to which it is so determined invalid or unenforceable to any
extent, shall not be affected thereby, and each provision hereof shall be
severable and valid and shall be enforced to the fullest extent permitted by
law; and it is the intention of the parties to this Lease that in lieu of each
clause or provision of this Lease that may be determined illegal, invalid or
unenforceable, there be added as a part of this Lease a clause or provision as
similar in terms to such illegal, invalid or unenforceable clause or provision
as may be possible to render the same legal, valid and enforceable.

         33.3     The headings of Articles and Sections of this Lease are for
convenience only and do not define or limit the contents thereof. References
made in this Lease to numbered Articles, Sections, subsections, Paragraphs and
Subparagraphs shall refer to the numbered Articles, Sections, subsections,
Paragraphs and Subparagraphs of this Lease unless otherwise indicated.

         33.4     Where appropriate, words in the singular, including without
limitation the words "LANDLORD" and "TENANT", include the plural, and vice
versa. Words in the neuter gender include the masculine and feminine genders,
and vice versa, and words in the masculine gender include the feminine and
neuter genders, and vice versa.

         33.5     If there be more than one TENANT, at any time or from time to
time, the obligations hereunder imposed upon TENANT shall be joint and several.

         33.6     Time is of the essence of this Lease.

         33.7     This Lease shall be governed by and interpreted in accordance
with the laws of the Commonwealth of Massachusetts.

         33.8     This Lease, along with any riders, exhibits and attachments or
other documents affixed to or referred to in this instrument (all of which
riders, exhibits, attachments and other documents are hereby incorporated into
this instrument by this reference), constitutes the entire

                                     - 30 -
<PAGE>

and exclusive agreement between LANDLORD and TENANT relating to the Leased
Premises, and this Lease and said riders, exhibits and attachments and other
documents may be altered, amended, modified or revoked only by an instrument in
writing signed by all of the parties hereto. All prior or contemporaneous
agreements, understandings and/or practices relative to the leasing of the
Leased Premises are revoked hereby. References in this instrument to this
"Lease" shall mean, refer to and include this Lease as well as any riders,
exhibits, attachments or other documents affixed to or referred to in this
instrument, and references to any term, provision, covenant, condition,
obligation, agreement and/or undertaking "herein", "hereunder" or "pursuant
hereto" (or language of like import) shall mean, refer to and include the terms,
provisions, covenants, conditions, obligations, agreements and undertakings
existing pursuant to this Lease and any riders, exhibits, attachments or other
documents affixed to or referred to in this Lease. All terms defined in this
Lease shall be deemed to have the same meanings in all riders, exhibits,
attachments or other documents affixed to or referred to in this Lease unless
the context thereof clearly requires the contrary.

         33.9     TENANT hereby represents that TENANT has not been represented
by any broker other than Cushman and Wakefield of Massachusetts, Inc. and Jones
Lang LaSalle. LANDLORD shall be solely responsible for the payment of any fee
due said brokers. TENANT hereby indemnifies and holds LANDLORD harmless from and
against any liability arising from a breach of the foregoing representation.

         33.10    TENANT understands and agrees that the obligations LANDLORD
pursuant to this Lease do not constitute personal obligations of the
shareholders, trustees, officers, partners, directors, employees, servants,
agents or contractors (including without limitation property managers, and any
affiliates thereof, and their respective officers, directors, trustees,
partners, employees, servants, agents and contractors) of LANDLORD, and TENANT
shall look solely to LANDLORD's then equity interest in the Property for the
satisfaction of any liability or obligation of LANDLORD pursuant to this Lease.
TENANT shall neither seek to enforce nor enforce any judgment or other remedy
against any other asset of LANDLORD or any individual who holds an interest in
LANDLORD.

         33.11    Submission of this Lease for examination, even though executed
by TENANT, shall not bind LANDLORD in any manner and no lease or other
obligation on the part of LANDLORD shall arise until this Lease is executed and
delivered by LANDLORD to TENANT. This Lease shall not be binding and in effect
until a counterpart hereof has been executed and delivered by the parties, each
to the other.

         33.12    Each of LANDLORD and TENANT agree not to record this Lease,
but each party hereto agrees, on the request of the other, to execute a
so-called notice of lease or short form lease in recordable form and otherwise
complying with applicable law and reasonably satisfactory to LANDLORD's and
TENANT's attorneys. In no event shall such document set forth the rent or other
charges payable by TENANT under this Lease; and any such document shall
expressly state that it is executed pursuant to the provisions contained in this
Lease and is not intended to vary the terms and conditions of this Lease. In the
event that (i) this Lease is terminated or the term of this Lease expires,
and/or (ii) any right in favor of TENANT to extend the term of this Lease
expires without being exercised, TENANT agrees to execute, within ten (10) days
after demand, a recordable notice of termination or a recordable amendment to
the

                                     - 31 -
<PAGE>

notice of lease, as applicable, setting forth any such event(s), in form and
substance reasonably satisfactory to LANDLORD.

         33.13    During the course of renovation of the Building, LANDLORD
shall use reasonable efforts to minimize interference with TENANT's use of and
access to the Leased Premises. Without limiting the foregoing, LANDLORD shall
require that no construction materials, tools, debris, or workers or other
construction related traffic will be carried through the lobbies or passenger
elevators, but shall be restricted to the freight elevator and Spring Lane for
access and egress.

         33.14    TENANT's employees shall be entitled to use the Spring Lane
Building entrance and Building freight elevators to transport bicycles to and
from the Leased Premises, and TENANT shall be entitled to allow its employees to
park bicycles in the Leased Premises.

         33.15    TENANT acknowledges that the financial terms and conditions of
this Lease are to remain confidential for the LANDLORD's benefit, and may not be
disclosed by TENANT to anyone (other than to TENANT's lenders, investors,
assignees, attorneys, accountants, and creditors as necessary for TENANT to
conduct its business), by any manner or means, directly or indirectly, without
LANDLORD's prior written consent. The consent by LANDLORD to any disclosures
shall not be deemed to be a waiver on the party of LANDLORD of any prohibition
against any future disclosure. Notwithstanding the foregoing, TENANT shall have
the right to disclose the financial terms and conditions of this Lease to the
extent required by law, including without limitation applicable securities laws.

                  [Remainder of Page Intentionally Left Blank]

                                     - 32 -
<PAGE>

         IN WITNESS WHEREOF, this instrument has been duly executed by the
parties hereto, as of the date and year first above written.

                              COLOR KINETICS, INC.


                              By:  /s/  David Johnson
                                 -----------------------------------------------
                                  Name:  David Johnson
                                  Title: Vice President of Finance

                              RAK OLD SOUTH ASSOCIATES LIMITED
                              PARTNERSHIP

                              By: RAK Washington Ventures Limited
                              Partnership, its general partner

                                  By: RAK Washington Corp., its general partner

                                       By:  /s/ Randy Kohana
                                          --------------------------------------
                                           Name:  Randy Kohana
                                           Title: President

<PAGE>

                                    EXHIBIT A

                                     [MAP]

<PAGE>


                                    EXHIBIT B

                                   Work Letter

1. LANDLORD shall use commercially reasonable efforts to complete or cause the
completion of the following work ("LANDLORD'S WORK") prior to the Estimated
Commencement Date:

-     demolition of existing conditions

-     ACM abatement

-     Slab to slab dimension is approximately nine (9) feet three (3) inches

-     Live load rate is 70 psi

-     Multiple domestic "wet" columns within the leased space

-     Pressurized fire stairs

-     Standard "Class E" life safety equipment located in lobby, available for
      TENANT tie in at TENANT's cost

-     Electrical service switch for direct metering by TENANT

-     Available fiber optic service

-     new bathrooms built to Building standards, including ADA

-     sprinkler loop with redistribution adapted to TENANT fit up, at TENANT's
      cost

-     new operable windows (Thermopane)

-     4-8 air handlers to provide approximately 55 tons of cooling

-     Skim Coat the floor

         2.       TENANT is currently having plans ("TENANT'S PLANS") prepared,
at TENANT's own expense, for the interior finish and other improvements to the
Leased Premises ("TENANT'S WORK"). TENANT shall submit TENANT's Plans to
LANDLORD no later than May 7, 2000. TENANT's Plans shall be substantially in
accordance with the preliminary descriptions of the buildout proposed by TENANT,
and shall otherwise be acceptable to LANDLORD in its reasonable direction.

         LANDLORD agrees to work with reasonable diligence with TENANT prior to
May 7th to enable TENANT to deliver a set of plans to LANDLORD on said date
which LANDLORD approves. Provided LANDLORD responds to TENANT's preliminary
plans within five (5) days of any request by TENANT, failure of TENANT to
deliver TENANT's Plans in final form by
<PAGE>
                                     - 2 -

May 7th shall constitute a TENANT Delay.

         3.       LANDLORD agrees that all contracts and subcontracts for work
within the Leased Premises shall be bid to a minimum of two (2) qualified
contractors selected by LANDLORD, and that TENANT shall have the right to submit
the contract for bid to an additional contractor. LANDLORD shall make available
for review by TENANT copies of all bids received and TENANT shall, within five
(5) business days of receipt thereof, notify LANDLORD if TENANT has a preference
with respect to any such contractor. The LANDLORD shall select the contractor or
subcontractor submitting the lowest bid, unless the LANDLORD, in its reasonable
discretion, elects not to select the low bidder because of a concern with
respect to quality or cost of the work or the ability of the selected contractor
or subcontractor to perform in a timely manner. TENANT shall have the right to
review bids for purposes of value engineering and suggesting changes to the
LANDLORD who shall communicate such suggestions to the contractors with a
request for a revision of bids. Change orders made by TENANT after approval of
the TENANT's Plans shall be bid to multiple contractors at LANDLORD's
discretion, and any additional time required to effect such changes shall
constitute TENANT Delay.

         4.       LANDLORD shall pay for the work set out in TENANT's Plans up
to the amount of $30.00 per rentable square foot (the "BUILDOUT ALLOWANCE").
TENANT shall pay any amounts in excess of the Buildout Allowance promptly upon
receipt of a bill therefor, provided that LANDLORD shall have expended the full
$608,130.00 of the Buildout Allowance prior to submitting any such bill to
TENANT. TENANT shall have the right to review LANDLORD's receipts, invoices and
other information from the contractor as it relates to buildout of the Leased
Premises.

         LANDLORD shall receive a fee of five percent (5%) of hard construction
costs for supervising the initial buildout.

         5.       LANDLORD shall request that the contractor notify TENANT of
the date of substantial completion of TENANTS Work at least five (5) days prior
thereto.

<PAGE>

                                    EXHIBIT C

                          Form of Estoppel Certificate

Landlord:         RAK Old South Associates Limited Partnership

Tenant:           Color Kinetics, Inc.

Address of Tenant:         10 Milk Street, Boston, Massachusetts 02108

Premises:         Approximately 20,271 square feet of Rentable Area on the
                  Eleventh Floor of the building located at 10 Milk Street,
                  Boston, Massachusetts (the "BUILDING").

Lease:            That certain Lease, dated April __, 2000, by and between
                  Landlord and Tenant and the following amendments, if any, (the
                  "Lease") a copy of which is attached and made a part hereof.

Commencement Date:                   _________________

Expiration Date:                     _________________

Security Deposit:                    $________________

Basic Annual Rent:                   $________________

Monthly Installments
Basic Annual Rent Paid
Through:                             _________________

Current Estimated
Monthly Installment of
Operating Expenses:                  $________________

Current Estimated
Monthly Installment of
Taxes                                $________________

Tenant hereby certifies as true and correct the following statements:

         (a)      The Lease is a true, correct and complete agreement between
                  Landlord and Tenant with respect to the premises described
                  therein (the "LEASED PREMISES").

         (b)      The Lease is in full force and effect and constitutes the
                  entire agreement between Landlord and Tenant. The Lease has
                  not been amended, modified, supplemented or changed, whether
                  in writing or orally (including, without limitation, any
                  agreement by Landlord to assume any lease of Tenant covering
                  space in other property), except as disclosed herein.

         (c)      Tenant is in sole possession of and is occupying the Leased
                  Premises. Except as
<PAGE>
                                     - 2 -

                  specified below, Tenant is not in any respect in default under
                  the Lease and has not subleased all or any part of the Leased
                  Premises or assigned the Lease, or otherwise transferred or
                  hypothecated its interest in the Lease or the Leased Premises.

         (d)      The Commencement Date and Expiration Date of the term of the
                  Lease are correctly stated above. Tenant has no options or
                  rights of renewal, extension, expansion, purchase or first
                  refusal concerning the Lease, the Leased Premises or other
                  space within the Building of which the Leased Premises are a
                  part, except as set forth below. Tenant has not exercised any
                  option or rights to renew, extend, amend, modify, or change
                  the term of the Lease, except as set forth below. Tenant does
                  not have any preferential right to purchase all or any part of
                  the property of which the Leased Premises are a part.

         (do not leave blank--write "N/A" if not applicable)

         _______________________________________________________________

         (e)      The Basic Annual Rent and other amounts payable under the
                  Lease are correctly stated above. Monthly Installments of
                  Basic Annual Rent have been paid through the date stated
                  above. Tenant has not prepaid any rent for more than one (1)
                  month and is paying rent under the Lease on a current basis
                  with no offsets, credits, claims or setoffs. Tenant has not
                  been given any free rent, partial rent, rebates, rent
                  abatements, or rent concessions of any kind, which are
                  unexpired, except as disclosed herein.

         (f)      Tenant has deposited the Security Deposit stated above with
                  Landlord, and to the best of Tenant's knowledge, none of the
                  Security Deposit has been applied by Landlord to the payment
                  of rent or any other amounts due under the Lease.

         (g)      Unless otherwise stated below, as of the date hereof, Landlord
                  has fully performed all of its obligations under the Lease and
                  has satisfied all commitments made to induce Tenant to enter
                  into the Lease. Tenant has no right of reduction, abatement or
                  set-off against the rent or any other charge payable to
                  Landlord. To the best of Tenant's knowledge, Landlord is not
                  in default under the terms and conditions of the Lease and no
                  event has occurred which would constitute a default under the
                  Lease, either upon service of notice or passage of time. To
                  the best of Tenant's knowledge, no claim, controversy or
                  dispute exists between Tenant and Landlord. As of the date
                  hereof, Tenant is not asserting that the Lease is not fully
                  enforceable by Landlord in accordance with its terms.

         (h)      All construction, build-out, improvements, or alterations to
                  the Leased Premises required under the Lease have been fully
                  completed in accordance with the plans and specifications
                  described in the Lease and all contributions required to be
                  made by Landlord on account thereof have been made.

         (i)      Landlord has not previously given any consent to Tenant (i.e.,
                  consent to sublease or alter the Leased Premises) that is
                  required under the Lease before the taking of
<PAGE>
                                     - 3 -


                  any action by Tenant, except as disclosed herein.

         (j)      Tenant is not insolvent and is able to pay its debts as they
                  mature. There are no actions, whether voluntary or otherwise,
                  pending against Tenant under the bankruptcy or insolvency laws
                  of the United States or any state thereof.

1.       Tenant agrees that from and after the date hereof, Tenant will not pay
         any rent under the Lease more than thirty (30) days in advance of its
         due date.

2.       Tenant hereby certifies that the address for notices to Tenant under
         the Lease is correctly set forth above.

         This certificate has been given to _________________ with the
understanding that _________________ will rely hereon in connection with [loans
which will be secured by the property of which the Leased Premises constitute a
part] [the purchase of the property of which the Leased Premises constitute a
part]. The undersigned hereby certifies that he or she is duly authorized to
sign and deliver this Estoppel Certificate.

         IN WITNESS WHEREOF, Tenant has caused this Estoppel Certificate to be
executed by its duly authorized representative as of the ____day of
________________, ____.

                                                 TENANT:

                                                 COLOR KINETICS, INC.

                                                 By:____________________________
                                                    Name:
                                                    Title:

<PAGE>

                                    EXHIBIT D

                              Rules and Regulations

         TENANT shall faithfully observe and comply with the following Rules and
Regulations. LANDLORD shall not be responsible to TENANT for the nonperformance
of any of said Rules and Regulations by or otherwise with respect to the acts or
omissions of any other tenants or occupants of the Building.

         1.       The sidewalks, entrances, passages, courts, elevators,
vestibules, stairways, corridors, and halls shall not be obstructed or
encumbered by any TENANT or used for any purpose other than ingress and egress
to and from the Leased Premises.

         2.       No awnings or other projections shall be attached to the
outside walls of the Building without the prior written consent of LANDLORD, in
LANDLORD's sole discretion. No curtains, blinds, shades, or screens shall be
attached to or hung in, or used in connection with, any window or door of the
Leased Premises, without the prior written consent of LANDLORD, in LANDLORD's
sole discretion. Such awnings, projections, curtains, blinds, shades, screens or
other fixtures must be of a quality, type, design, and color, and attached in
the manner approved by LANDLORD, in LANDLORD's sole discretion. TENANT shall use
1/2-inch Levelor blinds for all exterior windows (exact specifications to be
provided by LANDLORD).

         3.       No sign, advertisement, notice or other lettering shall be
exhibited, inscribed, painted or affixed by any TENANT on any part of the
outside of the Leased Premises or Building or on the inside of the Premises if
the same can be seen from the outside of the Premises without the prior written
consent of LANDLORD, in LANDLORD's sole discretion, except that the name of
TENANT may appear on the entrance door of the Leased Premises and on the
electronic directory at the security console in the Building lobby. In the event
of a violation of the foregoing by TENANT, LANDLORD may remove same without any
liability and may charge the expense incurred by such removal to the TENANT or
TENANT's violating this rule. Interior signs on doors shall be inscribed,
painted or affixed for each TENANT by LANDLORD at the expense of such TENANT and
shall be of a size and style acceptable to the LANDLORD, in LANDLORD's sole
discretion.

         4.       TENANT shall not occupy or permit any portion of the Leased
Premises demised to it to be occupied as an office for a public stenographer or
typist, or as a barber or manicure shop, or as an employment bureau, or for a
government agency. TENANT shall not engage or pay any employees on the Leased
Premises, except those actually working for TENANT at the Premises, nor
advertise for labor giving an address at the Premises. The Premises shall not be
used for gambling, lodging, or sleeping or for any immoral or illegal purposes.
The Leased Premises shall not be used for the manufacture, storage, or sale of
merchandise, goods or property of any kind whatsoever.

         5.       The skylights, windows, and doors that reflect or admit light
and air into the halls, passageway or other public places in the Building shall
not be covered or obstructed by any TENANT. No materials shall be placed in the
corridors or vestibules nor shall any articles obstruct any air conditioning
supply or exhaust vent.

<PAGE>
                                     - 2 -

         6.       No TENANT shall mark, paint, drill into, or in any way deface
any part of the Premises or the Building of which they form a part. No boring,
cutting, or stringing of wires shall be permitted, except with the prior written
consent of LANDLORD and as it may direct. Should a TENANT require telegraphic,
telephonic, or other communication service, LANDLORD will direct the
electricians where and how wires are to be introduced and placed, and none shall
be introduced or placed except as LANDLORD shall direct. Electric current shall
not be used for power or heating without LANDLORD's prior written permission.
Neither TENANT nor TENANT's Agents including, but not limited to, electrical
repairmen and telephone installers, shall lift, remove or in any way alter or
disturb any of the interior ceiling materials of the Premises or Building, nor
shall any of same have any access whatsoever to the area above the interior
ceiling of the Leased Premises or the Building except with the prior written
consent of LANDLORD and in accordance with guidelines established by LANDLORD.
No antennas shall be permitted.

         7.       No vehicles (except bicycles) or animals of any kind shall be
brought into or kept in or about the Premises. No TENANT shall cause or permit
any unusual or objectionable odors to be produced upon or permeate from the
Premises.

         8.       No TENANT shall make, or permit to be made, any unseemly or
disturbing noises or disturb or interfere with occupants of this or neighboring
buildings or premises or those having business with them, whether by the use of
any musical instrument, radio, talking machine, unmusical noise, whistling,
singing, or in any other way. No TENANT shall throw anything out of doors,
windows, skylights, or down the passageways.

         9.       No additional locks or bolts of any kind shall be placed upon
any of the doors or windows by any TENANT, nor shall any changes be made in
existing locks or the mechanism thereof. Each TENANT must, upon the termination
of his tenancy restore to the LANDLORD all keys of offices and toilet rooms,
either furnished to, or otherwise procured by, such TENANT. TENANT shall pay to
the LANDLORD the cost of any lost keys.

         10.      TENANT will refer all contractors, contractors'
representatives and installation technicians, rendering any service to TENANT,
to LANDLORD for LANDLORD's supervision, approval, and control before performance
of any contractual service. This provision shall apply to all work performed in
the Building, including installations of telephones, telegraph equipment,
electrical devices and attachments, and installations of any nature affecting
floors, walls, woodwork, trim, windows, ceilings, equipment or any other
physical portion of the Building.

         11.      All removals, or the carrying in or out of any safes, freight,
furniture or bulky matter of any description must take place during the hours
which the LANDLORD or its agent may determine from time to time. All such
movement shall be under supervision of LANDLORD and in the manner agreed between
TENANT and LANDLORD by pre-arrangement before performance. Such prearrangements
initiated by TENANT will include determination by LANDLORD, subject to his
decision and control, of the time, method, and routing of movement and
limitations imposed by safety or other concerns which may prohibit any article,
equipment or any other item from being brought into the building. LANDLORD
reserves the right to prescribe the weight and position of all safes, which must
be placed upon 2-inch thick plank strips to distribute the weight. Any damage
done to the Building or to other

<PAGE>

                                     - 3 -

TENANT's or to other persons in bringing in or removing safes, furniture or
other bulky or heavy articles shall be paid for by the TENANT.

         12.      TENANT agrees that all machines or machinery placed in the
Leased Premises by TENANT will be erected and placed so as to prevent any
vibration or annoyance to any other TENANTS in the Building of which the Leased
Premises are a part, and it is agreed that upon written request of LANDLORD,
TENANT will, within ten (10) days after the mailing of such notice, provide
approved settings for the absorbing, preventing, or decreasing of noise from any
or all machines or machinery placed in the Leased Premises.

         13.      Each TENANT shall, at its expense, provide artificial light
for the employees of the LANDLORD while doing janitor service or other cleaning,
and in making repairs or alterations in said Leased Premises.

         14.      Employees of LANDLORD shall not receive or carry messages for
or to any TENANT or other person nor contract with or render free or paid
services to any TENANT or TENANT's agent, employees, or invitees.

         15.      Canvassing, soliciting, and peddling in the Building is
prohibited and each TENANT shall cooperate to prevent the same.

         16.      TENANT shall have the free use of the mail chutes, if any,
installed in the Building, but the LANDLORD does not guaranty the efficiency of
the said mail chutes and shall not be responsible for any damage or delay which
may arise from use thereof.

         17.      LANDLORD specifically reserves the right to refuse admittance
to the Building from 7 p.m. to 7 a.m. daily, or on Saturdays, Sundays or legal
holidays, to any person or persons who cannot furnish satisfactory
identification, or to any person or persons who, for any other reason in the
LANDLORD's judgment, should be denied access to the Leased Premises. LANDLORD,
for the protection of the TENANT and TENANT's effects may prescribe hours and
intervals during the night and on Saturdays, Sundays and holidays, when all
persons entering and departing the Building shall be required to enter their
names, the offices to which they are going. or from which they are leaving, and
the time of entrance and departure in a register provided for the purpose by the
LANDLORD.

         18.      No TENANT, nor any of TENANT's Agents, shall at any time bring
or keep upon the Premises any inflammable, combustible, or explosive fluid,
chemical, or substance.

         19.      LANDLORD reserves the right at any time to change or rescind
any one or more of these Rules and Regulations, or to make such other and
further reasonable Rules and Regulations as in LANDLORD's judgment may from time
to time be necessary for the management, safety, care and cleanliness of the
Leased Premises and Building, and for the preservation of good order therein, as
well as for the convenience of other occupants and tenants therein. LANDLORD
shall not be responsible to TENANT or to any other person for the nonobservance
of the Rules and Regulations by another tenant or other person. TENANT shall be
deemed to have read these Rules and Regulations and to have agreed to abide by
them as a condition of its occupancy of the Leased Premises.

<PAGE>
                                   Exhibit E


                                     DRAFT

IRREVOCABLE STANDBY LETTER OF CREDIT NO. SVB00ISXXX

DATE:

BENEFICIARY:
RAK OLD SOUTH ASSOCIATES, LIMITED PARTNERSHIP
140 WEST 57TH STREET
NEW YORK, N.Y. 10019

APPLICANT:
COLOR KINETICS
50 MILK STREET, 17TH FLOOR
BOSTON, MA 02109

AMOUNT: US$000.000.00

(XXXXXXXXXXXXXXXXXXXXXXXXXXX AND 00/100 U.S. DOLLARS)

EXPIRATION DATE: (INSERT EXPIRATION DATE)

LOCATION: AT OUR COUNTERS IN SANTA CLARA, CALIFORNIA

DEAR SIR/MADAM:

WE HEREBY ESTABLISH OUR IRREVOCABLE TRANSFERABLE STANDBY LETTER OF CREDIT NO.
SVB00ISXXXX IN YOUR FAVOR AVAILABLE BY YOUR DRAFTS DRAWN ON US AT SIGHT AND
ACCOMPANIED BY THE FOLLOWING DOCUMENTS:

1.   THE ORIGINAL OF THIS LETTER OF CREDIT AND ALL AMENDMENT(S), IF ANY.

2.   A DATED CERTIFICATION SIGNED BY AN AUTHORIZED OFFICER OF THE BENEFICIARY,
     FOLLOWED BY ITS DESIGNATED TITLE, STATING THE FOLLOWING:

         "AN EVENT OF DEFAULT (AS DEFINED IN THE LEASE) HAS OCCURED UNDER THAT
         CERTAIN LEASE AGREEMENT BETWEEN COLOR KINETICS, AS TENANT, AND RAK OLD
         SOUTH ASSOCIATES. LIMITED PARTNERSHIP, AS LANDLORD, AND THE TERMS AND
         CONDITIONS OF THE LEASE AUTHORIZE LANDLORD TO NOW DRAW DOWN ON THE
         LETTER OF CREDIT."

PARTIAL DRAWS ARE ALLOWED. THIS LETTER OF CREDIT MUST ACCOMPANY ANY DRAWINGS
HEREUNDER FOR ENDORSEMENT OF THE DRAWING AMOUNT AND WILL BE RETURNED TO THE
BENEFICIARY UNLESS IT IS FULLY UTILIZED.

THIS LETTER OF CREDIT SHALL BE AUTOMATICALLY EXTENDED FOR AN


                                  Page 1 of 2
<PAGE>

ADDITIONAL PERIOD OF ONE YEAR, WITHOUT AMENDMENT, FROM THE PRESENT OR EACH
FUTURE EXPIRATION DATE UNLESS AT LEAST THIRTY (30) DAYS PRIOR TO THE THEN
CURRENT EXPIRATION DATE WE NOTIFY YOU BY REGISTERED MAIL/OVERNIGHT COURIER
SERVICE AT THE ABOVE ADDRESS THAT THIS LETTER OF CREDIT WILL NOT BE EXTENDED
BEYOND THE THEN CURRENT EXPIRATION DATE. IN NO EVENT SHALL THIS LETTER OF CREDIT
BE AUTOMATICALLY EXTENDED BEYOND (INSERT FINAL EXPIRY DATE).

THIS LETTER OF CREDIT IS TRANSFERABLE SUCCESSIVELY IN ITS ENTIRETY ONLY UP TO
THE THEN AVAILABLE AMOUNT IN FAVOR OF ANY NOMINATED TRANSFEREE THAT IS THE
SUCCESSOR IN INTEREST TO BENEFICIARY OR IS THE NEW OWNER OF 10 MILK STREET,
BOSTON, MASSACHUSETTS ("TRANSFEREE"), ASSUMING SUCH TRANSFER TO SUCH TRANSFEREE
WOULD BE IN COMPLIANCE WITH THEN APPLICABLE LAW AND REGULATIONS, INCLUDING BUT
NOT LIMITED TO THE REGULATIONS OF THE U.S. DEPARTMENT OF TREASURY AND U.S.
DEPARTMENT OF COMMERCE. AT THE TIME OF TRANSFER, THE ORIGINAL LETTER OF CREDIT
AND ORIGINAL AMENDMENT(S), IF ANY, MUST BE SURRENDERED TO US TOGETHER WITH OUR
LETTER OF TRANSFER DOCUMENTATION (IN THE FORM OF EXHIBIT "A" ATTACHED HERETO).
OUR TRANSFER FEE OF 1/4 OF 1% OF THE TRANSFER AMOUNT (MINIMUM $250.00) IS FOR
THE ACCOUNT OF THE APPLICANT.

DRAFT(S) AND DOCUMENTS MUST INDICATE THE NUMBER AND DATE OF THIS LETTER OF
CREDIT.

DOCUMENTS MUST BE FORWARDED TO US BY OVERNIGHT DELIVERY SERVICE TO: SILICON
VALLEY BANK. 3003 TASMAN DRIVE, SANTA CLARA CA 95054, ATTN: INTERNATIONAL
DIVISION.

WE HEREBY AGREE WITH THE DRAWERS, ENDORSERS AND BONAFIDE HOLDERS THAT THE DRAFTS
DRAWN UNDER AND IN ACCORDANCE WITH THE TERMS AND CONDITIONS OF THIS LETTER OF
CREDIT SHALL BE DULY HONORED UPON PRESENTATION TO THE DRAWEE, IF NEGOTIATED ON
OR BEFORE THE EXPIRATION DATE OF THIS CREDIT.

THIS LETTER OF CREDIT IS SUBJECT TO THE UNIFORM CUSTOMS AND PRACTICE FOR
DOCUMENTARY CREDITS (1993 REVISION), INTERNATIONAL CHAMBER OF COMMERCE,
PUBLICATION NO. 500.

__________________________________               _______________________________
AUTHORIZED SIGNATURE                             AUTHORIZED SIGNATURE

                                   EXHIBIT "A"

                                  PAGE 2 OF 2

<PAGE>

DATE:

TO:  SILICON VALLEY BANK
     3003 TASMAN DRIVE                          RE: STANDBY LETTER OF CREDIT
     SANTA CLARA, CA 95054                      NO. _______________ ISSUED BY
       ATTN:  INTERNATIONAL DIVISION.           SILICON VALLEY BANK, SANTA CLARA
       STANDBY LETTERS OF CREDIT                L/C AMOUNT:

GENTLEMEN:

FOR VALUE RECEIVED, THE UNDERSIGNED BENEFICIARY HEREBY IRREVOCABLY TRANSFERS TO:

(NAME OF TRANSFEREE)
(ADDRESS)

ALL RIGHTS OF THE UNDERSIGNED BENEFICIARY TO DRAW UNDER THE ABOVE LETTER OF
CREDIT UP TO ITS AVAILABLE AMOUNT AS SHOWN ABOVE AS OF THE DATE OF THIS
TRANSFER.

BY THIS TRANSFER, ALL RIGHTS OF THE UNDERSIGNED BENEFICIARY IN SUCH LETTER OF
CREDIT ARE TRANSFERRED TO THE TRANSFEREE. TRANSFEREE SHALL HAVE THE SOLE RIGHTS
AS BENEFICIARY THEREOF, INCLUDING SOLE RIGHTS RELATING TO ANY AMENDMENTS,
WHETHER INCREASES OR EXTENSIONS OR OTHER AMENDMENTS, AND WHETHER NOW EXISTING OR
HEREAFTER MADE. ALL AMENDMENTS ARE TO BE ADVISED DIRECT TO THE TRANSFEREE
WITHOUT NECESSITY OF ANY CONSENT OF OR NOTICE TO THE UNDERSIGNED BENEFICIARY.

THE ORIGINAL OF SUCH LETTER OF CREDIT IS RETURNED HEREWITH, AND WE ASK YOU TO
ENDORSE THE TRANSFER ON THE REVERSE THEREOF, AND FORWARD IT DIRECTLY TO THE
TRANSFEREE WITH YOUR CUSTOMARY NOTICE OF TRANSFER.

SINCERELY,

______________________________
(BENEFICIARY'S NAME)

______________________________
SIGNATURE OF BENEFICIARY

SIGNATURE AUTHENTICATED

______________________________
(NAME OF BANK)

______________________________
AUTHORIZED SIGNATURE

<PAGE>
                                   Exhibit F

                            JANITORIAL SPECIFICATIONS

                                OFFICES - CARPET

DAILY SERVICE

-    Empty all trash receptacles; replace liners if necessary but not less than
     weekly. (LINERS TO BE PROVIDE BY CONTRACTOR)

-    Remove all collected trash to designated area.

-    Empty and damp wipe ashtrays.

-    Spot clean all horizontal and vertical surfaces removing fingerprints,
     smudges and stains.

-    Spot clean all partition glass.

-    Dust wipe and sanitize all telephones including ear and mouth pieces.

-    Using approved spotter, spot clean carpeted areas.

-    Vacuum all carpeted areas.

THREE TIMES/WEEKLY SERVICE

-    Dust all furniture, fixtures, equipment and accessories.

WEEKLY SERVICE

-    Dust all low reach areas.

-    Using tank vacuum or back pack, vacuum corners edges and chairs.

MONTHLY SERVICE

-    Dust all high reach areas.

EVERY OTHER MONTH SERVICE

-    Dust all window blinds.

-    Dust HVAC louvers / diffusers.

NOTE :   Vacuuming is accomplished in most cases, by a combination of tasks
         FULL - TRAFFIC - DETAIL - SPOT. Combined, they provide the vacuuming
         required.


<PAGE>

                             OFFICES - HARD SURFACES

DAILY SERVICE

-    Empty all trash receptacles; replace liners if necessary but not less than
     weekly. (LINERS TO BE PROVIDE BY CONTRACTOR)

-    Remove all collected trash to designated area.

-    Empty and damp wipe ashtrays.

-    Dust all furniture, fixtures, equipment and accessories.

-    Spot clean all horizontal and vertical surfaces removing fingerprints,
     smudges and stains.

-    Spot clean all partition glass.

-    Dust wipe and sanitize all telephones including car and mouth pieces.

-    Dust mop all hard surface floors with treated or electrostatic dust mop.

-    Mop all stains and spills, especially coffee and drink spills.

WEEKLY SERVICE

-    Dust all low reach areas.

-    Using a high speed machine spray buff all hard surface areas.

MONTHLY SERVICE

-    Dust all high reach areas.

-    Vacuum all fabric furniture.

-    Clean all baseboards.

-    Dust HVAC louvers / diffusers.

-    Dust all window blinds.


EVERY OTHER MONTH SERVICE

-    Machine scrub hard surface floor and apply one coat of polish, allow to
     dry, then buff.

YEARLY SERVICE

-    Strip hard surface floor and recoat with three coats of floor polish.

BI-ANNUAL SERVICE

-    Window cleaning

                   KITCHENETTES/COFFEE STATIONS - HARD SURFACE

DAILY SERVICE

-    Empty all trash receptacles; replace liners if necessary but not less then
     weekly. (LINERS TO BE PROVIDE BY CONTRACTOR)

<PAGE>

-    Remove all collected trash to designated area.

-    Spot clean all horizontal and vertical surfaces removing fingerprints,
     smudges, and stains.

-    Using a damp cloth-dust all horizontal surfaces.

-    Damp clean and sanitize table tops.

-    Dust mop all hard surface floors with treated or electrostatic dust mop.

-    Mop all stains and spills, especially coffee and drink spills.

WEEKLY SERVICE

-    Spot clean backs and seats of chairs.

-    Using a high speed floor machine spray buff all hard surface areas.

MONTHLY SERVICE

-    Clean all baseboards.

-    Dust HVAC louvers / diffusers.


              CORRIDORS - ELEVATOR LOBBIES - CARPET / HARD SURFACE

DAILY SERVICE

-    Dust mop all hard surface floors with treated or electrostatic dust mop.

-    Mop all stains and spills, especially coffee and drink spills.

-    Clean and polish all bright metalwork.

-    Using a high speed floor machine spray buff all hard surface areas.

-    Spot clean all horizontal and vertical surfaces removing fingerprints,
     smudges and stains.

-    Using approved spotter, spot clean carpeted area. Vacuum all carpeted
     traffic lane areas.

WEEKLY SERVICE

-    Using tank vacuum or back pack, vacuum corners edges and chairs then
     traffic vacuum all carpeted areas.

-    Dust all low reach areas.

MONTHLY SERVICE

-    Dust all high reach areas.

-    Machine scrub hard surface-floor and apply one coat of polish, allow to
     dry, then buff.


<PAGE>

YEARLY SERVICE

-    Strip hard surface floor and recoat with three coats of floor polish.

                            RESTROOMS - CERAMIC TILE

DAILY SERVICE

-    Refill dispensers, empty trash, clean and sanitize all restroom fixtures,
     wipe all counters, clean mirrors, wipe chrome, spot wipe partitions, sweep
     and damp mop floors using a germicidal cleaner. Empty sanitary napkin
     holders. (PAPER TOWEL, TOILET PAPER AND HAND SOAP TO BE PROVIDE BY OWNER)

MONTHLY SERVICE

-    Machine scrub hard surface floor and apply one coat of polish, allow to
     dry, then buff.

-    Dust and clean all returns air vents.

-    Wash all restroom partitions on both sides.

YEARLY SERVICE

-    Wash all walls using machine.

                        PRIVATE RESTROOMS - HARD SURFACE

DAILY SERVICE

-    Refill dispensers, empty trash, clean and sanitize all restroom fixtures,
     wipe all counters; clean mirrors, wipe chrome, spot wipe partitions, sweep
     and damp mop floors using a germicidal cleaner. Empty sanitary napkin
     holders. (MEDICAL CLINICS LAVATORIES NOT INCLUDED)


MONTHLY SERVICE

-    Dust and clean all return air vents.

-    Wash all restroom partitions on both side.

-    Machine scrub hard surface floor and apply one coat of polish, allow to
     dry, then buff.


<PAGE>

                               COPIER ROOMS - TILE

DAILY SERVICE

-    Empty all trash receptacles; replace liners if necessary but not less than
     weekly. (liner to be provide by contractor)

-    Remove all collected trash to designated area.

-    Dust all horizontal surfaces.

-    Spot clean all horizontal and vertical surfaces removing fingerprints,
     smudges and stains.

-    Dust mop all hard surface floors with treated or electrostatic dust mop.

-    Mop all stains and spills, especially coffee and drink spills.

WEEKLY SERVICE

-    Dust high and low areas (E.G., PICTURES, PARTITION TOPS, ETC.).

MONTHLY SERVICE

-    Clean all baseboards.

-    Dust HVAC louvers / diffusers.