Exhibit 10-23

                                      LEASE

                             DATED: FEBRUARY 8, 1996

                  MASSACHUSETTS INSTITUTE OF TECHNOLOGY, LESSOR

                          ANALOG DEVICES, INC., LESSEE

                   21 OSBORN STREET, CAMBRIDGE, MASSACHUSETTS


                                TABLE OF CONTENTS


                                                                           
1.0  Parties and Premises..................................................   1
     1.1  Parties and Premises.............................................   1
     1.2  Common Areas.....................................................   1
     1.3  Lessee's Option to Lease Additional Space........................   2
     1.4  Lessee's Right of First Refusal..................................   2
     1.5  Signs............................................................   2

2.0  Term .................................................................   3
     2.1  Term; Commencement Date..........................................   3
     2.2  Extension Option.................................................   3


3.0  Rent .................................................................   3
     3.1  Payment of Rent..................................................   3
     3.2  Computation of Basic Rent........................................   4

4.0  Permitted Uses........................................................   5

5.0  Taxes; Operating Expenses.............................................   6
     5.1  Taxes............................................................   6
     5.2  Operating Expenses...............................................   7
     5.3  Payment of Taxes and Operating Expenses..........................   8
     5.4  Abatement of Taxes...............................................   9

6.0  Meters for Utilities..................................................   10

7.0  Insurance.............................................................   10
     7.1  Public Liability Insurance.......................................   10
     7.2  Casualty Insurance...............................................   10
     7.3  Certificate of Insurance.........................................   10
     7.4  Lessor's Insurance...............................................   11
     7.5  Waiver of Subrogation............................................   11
     7.6  Waiver of Rights.................................................   12

8.0  Assignment and Subletting.............................................   12



                                       -i-


                                                                           
9.0  Parking...............................................................   15

10.0 Late Payment of Rent..................................................   15

11.0 Lessee's Covenants....................................................   15

12.0 Casualty and Eminent Domain...........................................   21
     12.1 Substantial Taking...............................................   21
     12.2 Partial Taking...................................................   21
     12.4 Substantial Casualty.............................................   22
     12.5 Repair and Restoration...........................................   23

13.0 Defaults; Events of Default; Remedies.................................   23
     13.1 Defaults; Events of Default......................................   23
     13.2 Termination......................................................   24
     13.3 Survival of Covenants............................................   25
     13.4 Damages..........................................................   25
     13.5 Right to Relet...................................................   26
     13.6 Right to Equitable Relief........................................   27
     13.7 Right to Self Help...............................................   27
     13.8 Further Remedies.................................................   27

14.0 Construction..........................................................   28

15.0 Lessor's Right of Entry...............................................   28

16.0 Real Estate Broker....................................................   28

17.0 Notices...............................................................   28

18.0 No Waivers............................................................   29

19.0 Ground Leases; Mortgages..............................................   29
     19.1 Rights of Ground Lessors and Mortgagees..........................   29
     19.2 Lease Subordinate................................................   30

20.0 Notice of Lease; Estoppel Certificates................................   31

21.0 Holding Over..........................................................   31

22.0 Force Majeure.........................................................   31

23.0 Entire Agreement......................................................   31

24.0 Successors and Assigns................................................   32

25.0 Applicable Law, Severability and Construction.........................   32

26.0 Authority.............................................................   32

27.0 Work to be Performed by Polaroid Corporation..........................   32



                                      -ii-

EXHIBIT A - PREMISES.......................................................   34

EXHIBIT B - WORK LETTER....................................................   35


                                      -iii-

                                      LEASE

      Dated: February 8, 1996

      1.0   Parties and Premises.

            1.1   PARTIES AND PREMISES. MASSACHUSETTS INSTITUTE OF TECHNOLOGY
                  ("Lessor") hereby LEASES unto ANALOG DEVICES, INC. ("Lessee"),
                  the following premises:

                        The entire basement, first and second floors, containing
                        68,135 square feet of rentable area (the "Premises") of
                        the building known as and numbered 21 Osborn Street,
                        Cambridge, Massachusetts, containing a total of 117,130
                        rentable square feet (the "Building"), which is located
                        on the parcel of land described on EXHIBIT A attached
                        hereto (the "Land"),

                  together with the benefit of, and subject to (as the case may
                  be) all rights, easements, covenants, conditions,
                  encumbrances, encroachments and restrictions of record as of
                  the date of this Lease. Lessor shall have the right, without
                  the necessity of obtaining Lessee's consent thereto or joinder
                  therein, to grant, permit, or enter into during the term of
                  this Lease such additional rights, easements, covenants,
                  conditions, encumbrances, encroachments and restrictions with
                  respect to the Land as Lessor may deem appropriate, PROVIDED
                  THAT no such rights, easements, covenants, conditions,
                  encumbrances, encroachments or restrictions shall materially
                  affect Lessee's use of the Premises for the "Permitted Uses"
                  (as defined in Section 4.0 below).

                  Lessor hereby reserves the right to use the first floor lobby
                  and service and freight elevators in the Building in common
                  with the Lessee and the right to pass through the Premises as
                  reasonably necessary for access to such elevators in
                  accordance with Section 15 below.

                  Lessor hereby further reserves the right to maintain, use,
                  repair and replace pipes, ducts, wires, meters and any other
                  equipment, machinery, apparatus and fixtures located within
                  the Premises and serving other parts of the Building. Lessee,
                  its employees and invitees shall have access to the Premises
                  at all times, subject to Lessor's reasonable security
                  procedures.

            1.2   COMMON AREAS. Lessor also grants to Lessee, and Lessee's
                  invitees, the right, in common with others


                                       -1-

                  entitled thereto, to use for the purposes for which they were
                  designed, the common facilities of the Building, including but
                  not limited to, all entrances, elevator foyers, air shafts,
                  elevator shafts and elevators, stairwells and stairs,
                  passenger elevators, freight elevator, loading bays, and the
                  "Parking Area" (as defined in Section 9.0 below)
                  (collectively, the "Common Areas"). Lessee shall also have the
                  right to maintain gas storage tanks and associated piping
                  outside the Building on the Land for gas to be delivered to
                  the Premises, in compliance with the terms and conditions set
                  forth in this Lease.

            1.3   LESSEE'S OPTION TO LEASE ADDITIONAL SPACE. Provided that both
                  (i) an "Event of Default" (as defined in Section 13.1 below)
                  has not occurred prior to the day on which Lessee purports to
                  exercise the Expansion Option or prior to the first date on
                  which the Expansion Space will be occupied, and (ii) the
                  Lessee named herein is actually occupying substantially the
                  entire Premises as of each of such dates, Lessee shall have
                  the right and option ("Expansion Option") to lease either the
                  entire third floor or the entire third and fourth floors of
                  the Building ("Expansion Space"); PROVIDED THAT Lessee's
                  occupancy and obligation to pay Rent therefor must commence,
                  if at all, during the first year of the Initial Term. This
                  option may be exercised by the Lessee by notice thereof to
                  Lessor, dispatched not less than sixty (60) days prior to the
                  date on which Lessee will take occupancy of the additional
                  space, and upon the exercise of this option, the Premises
                  shall include such space. Except for the change in Basic Rent
                  as described in Section 3.2 below, all of the terms and
                  conditions of this agreement shall apply in respect to the
                  additional space. The parties agree that the third floor
                  contains 24,030 square feet of rentable space and that the
                  fourth floor contains 24,965 square feet of rentable space.

            1.4   LESSEE'S RIGHT OF FIRST REFUSAL. Notwithstanding the failure
                  of the Lessee to exercise its option under Section 1.3, if,
                  during the Term, Lessor decides to occupy the third and/or
                  fourth floors of the Building or to offer the space to a third
                  party, Lessee shall have a right of first refusal to lease
                  either the entire third floor or the entire third and fourth
                  floors of the Building for the Rent per Lease Year or portion
                  thereof which would have been due and payable for such space
                  and subject to the same conditions and on the same terms and
                  conditions as if the option had been exercised.

            1.5   SIGNS. Lessee shall have the right to maintain one or more
                  signs on the Premises; PROVIDED THAT all signs


                                       -2-



                  shall comply with applicable Legal Requirements (as defined
                  below) and shall have been approved by Lessor in advance which
                  approval shall not be unreasonably withheld or delayed.

      2.0   Term; Commencement Date; Extension Options.

            2.1   TERM; COMMENCEMENT DATE. The initial term of this Lease (the
                  "Initial Term") shall commence on February 13, 1996, the
                  "Commencement Date," and expire on the day immediately
                  preceding the fifth anniversary thereof, unless sooner
                  terminated as hereinafter provided. For purposes of this
                  Lease, the phrase "Term" shall mean collectively (a) the
                  Initial Term, and (b) if Lessee duly exercises one or more
                  "Extension Option(s)", the "Extension Term" (as these phrases
                  are defined in Section 2.2 below).

            2.2   EXTENSION OPTIONS. Provided that both (i) an "Event of
                  Default" (as defined in Section 13.1 below) has not occurred
                  prior to the day on which Lessee purports to exercise the
                  Extension Option or prior to the first day of the Extension
                  Term, and (ii) the Lessee named herein is actually occupying
                  substantially the entire Premises as of each of said dates,
                  Lessee shall have the option ("Extension Option") to extend
                  the Lease Term of this Lease for two additional periods of
                  five (5) years each (the "Extension Term(s)"), unless sooner
                  terminated as hereinafter provided, subject to all the terms
                  of this Lease except for the change in Basic Rent as provided
                  in Section 3.2 of this Lease.

                  Lessee shall exercise an Extension Option, if at all, by
                  giving written notice of exercise to Lessor not earlier than
                  twelve (12) months prior to, nor later than six (6) months
                  prior to, the last day of the Initial Lease Term or the first
                  Extension Term as applicable. If Lessee fails to give such
                  notice to Lessor within such time, Lessee shall be deemed to
                  have waived the right to exercise the applicable Extension
                  Option.

      3.0   Rent.

            3.1   PAYMENT OF RENT. Lessee shall pay Lessor, without offset or
                  deduction and without previous demand therefor, as items
                  constituting rent (collectively, "Rent"):

                  (a)   Basic rent ("Basic Rent") at the rate hereinafter set
                        forth, in equal monthly installments, in advance,
                        commencing three months after the Commencement Date (the
                        "Rent Commencement Date") and continuing thereafter on
                        the first day of each


                                       -3-



                        calendar month or portion thereof during the Term. Basic
                        Rent shall be PRO-RATED for partial months occurring at
                        the beginning or the end of the Term, and, with respect
                        to the Additional Space, for any partial Lease Year at
                        the beginning of the Term; and

                  (b)   All other costs, charges, or expenses which Lessee in
                        this Lease agrees to pay, or which Lessor pays or incurs
                        as the result of a default by Lessee hereunder,
                        including any penalty or interest which may be added for
                        nonpayment or late payment thereof as provided in this
                        Lease (collectively, "Additional Rent"). All recurring
                        payments of Additional Rent, such as payment on account
                        of "Operating Expenses" (as such term is hereinafter
                        defined), shall be due and payable on the same day on
                        which Basic Rent is due, except that "Taxes" (as such
                        term is hereinafter defined) shall be due and payable in
                        installments not later than ten (10) days before Lessor
                        is obliged to make installment payments to the City of
                        Cambridge without incurring interest and penalties but
                        not sooner than ten (10) days after receipt by Lessee of
                        written demand therefor from Lessor accompanied by a
                        copy of the current tax bill. Unless otherwise
                        specifically provided in this Lease, all non-recurring
                        items constituting Additional Rent shall be due and
                        payable within thirty (30) days after demand therefor by
                        Lessor.

                  All payments shall be made to Lessor or such agent, and at
                  such place, as Lessor shall, from time to time, in writing
                  designate, the following being now so designated:

                              Meredith & Grew Inc. as agent for
                              Massachusetts Institute of Technology
                              160 Federal Street
                              Boston, MA 02110-1710

            3.2   COMPUTATION OF BASIC RENT. Basic Rent shall be due and payable
                  hereunder during the Initial Term and any Extension Term in
                  the amount of $1,000,008 per Lease Year, in installments of
                  $83,334 per month, except that Basic Rent for the first Lease
                  Year shall be $750,006 because of the three month rent free
                  period at the beginning of the Initial Term; PROVIDED THAT, if
                  Lessee exercises its option to lease additional space (the
                  "Additional Space") under Section 1.3 or its right of first
                  refusal therefor under Section 1.4, Basic Rent shall be
                  increased by $240,300 per Lease Year if exercised with respect
                  to the third floor only or by


                                       -4-

                  $489,950 per Lease Year if exercised with respect to both the
                  third and fourth floors, commencing on the date of occupancy
                  and subject to adjustment during any Extension Term as
                  follows:

                        for each Extension Term annual Basic Rent applicable to
                        the Additional Space shall be adjusted at the
                        commencement date as follows:

                        (i) The index used for calculation of any adjustment
                        shall be the official Consumer's Price Index, Boston
                        Area, all items, (1982-1984 = 100) published by the
                        Bureau of Labor Statistics, U.S. Department of Labor, or
                        its successor index should the Department of Labor cease
                        publishing the CPI.

                        (ii) Annual Basic Rent applicable to the Additional
                        Space for each Extension Term shall be the annual Basic
                        Rent therefor for the preceding five years of the Term
                        plus an additional amount as determined in paragraph
                        (iii).

                        (iii) The index for the month of November immediately
                        preceding the termination of the Initial Term or the
                        First Commencement Term as applicable shall be compared
                        to the index for the same month immediately preceding
                        the commencement of such five year term. The numerator
                        shall be the index for the later year and the
                        denominator shall be the index for the earlier year. The
                        result shall be multiplied by the current annual Basic
                        Rent for the Additional Space to determine the new
                        annual Basic Rent therefor.

                  As used in this Lease, "Lease Year" means the twelve (12)
                  month period commencing on the Commencement Date, or a
                  successive twelve (12) month period included in the Term
                  commencing on an anniversary of that day, but if the
                  expiration of the Term or the earlier termination of the Lease
                  does not coincide with the termination of such a twelve (12)
                  month period, the term "Lease Year" shall mean the portion of
                  such twelve (12) month period before such expiration or
                  termination.

      4.0   PERMITTED USES. The Premises shall be used for the following
            purposes (the "Permitted Uses") only and for no other:

                  light manufacturing (including, without limitation,
                  manufacturing, processing, assembly and packaging of
                  electronic components), research and development and


                                       -5-

                  office uses; in each case to the extent permitted as a matter
                  of right under the zoning ordinance of the City of Cambridge,
                  Massachusetts.

      5.0   Taxes; Operating Expenses.

            5.1   TAXES. Lessee shall pay as Additional Rent its pro rata share
                  of all taxes, special or general assessments and other
                  impositions and charges imposed by governmental authorities of
                  every kind and nature whatsoever, extraordinary as well as
                  ordinary and each and every installment thereof which shall or
                  may during the Term be charged, levied, laid, assessed,
                  imposed, become due and payable or become liens upon or for or
                  with respect to the Land or any part thereof and the Building
                  or the Premises, or appurtenances or equipment owned by Lessor
                  thereon or therein or any part thereof, or on this Lease, and
                  any tax based on a percentage, fraction or capitalized value
                  of the Rent (whether in lieu of or in addition to the taxes
                  hereinbefore described) (collectively, "Taxes"); provided
                  however that:

                  (a)   if, by law, any Taxes may at the option of the taxpayer
                        be paid in installments, Lessee may pay the same in such
                        installments over such period as the law allows, and
                        Lessee shall only be liable for such installments as
                        shall become due during the Term of this Lease, PROVIDED
                        THAT the full amount of all Taxes attributable to the
                        Term shall be paid by Lessee in the event of an earlier
                        termination of this Lease due to a default of Lessee;
                        and

                  (b)   all Taxes for the municipal fiscal years in which the
                        Term of this Lease shall begin and end shall be
                        apportioned so that Lessee shall pay only those portions
                        thereof which correspond with the portion of said year
                        as is within the Term hereby demised.

                  Taxes shall not include inheritance, estate, excise,
                  succession, transfer, gift, franchise, income, gross receipt,
                  or profit taxes except to the extent such are in lieu of or in
                  substitution for Taxes as now imposed on the Building, the
                  Land, the Premises or this Lease. Lessee's share of Taxes
                  shall be computed as follows: (i) with respect to the Building
                  and the land under the Building, a percentage equal to the
                  ratio of the number of rentable square feet occupied by the
                  Tenant in the Building to the number of rentable square feet
                  in the Building; and (ii) with respect to the remainder of the
                  Land, a percentage equal to the ratio of the number of parking
                  spaces allocated to the Premises under Section 9 to the
                  aggregate number of parking spaces on the Premises. The
                  parties hereby agree that rentable square


                                       -6-

                  feet for the Premises, the Building and the third and fourth
                  floors of the Building are as set forth in Sections 1.1 and
                  1.3 above. If Lessee takes occupancy of Additional Space under
                  its option or right of first refusal set forth in Section 1.3
                  and Section 1.4 during the course of any year of the Term,
                  Taxes for such year shall be determined separately for each
                  partial year before and after the date of occupancy.

            5.2   OPERATING EXPENSES. Lessee shall pay as Additional Rent
                  Lessee's share as reasonably determined by the Lessor of all
                  expenses, costs, and disbursements of every kind and nature
                  (collectively, "Operating Expenses") which Lessor shall pay or
                  become obligated to pay in connection with the ownership,
                  operation and maintenance of the Building or the Land,
                  including all facilities in operation on the Commencement Date
                  and such additional facilities in subsequent years as may be
                  determined by Lessor to be necessary or beneficial for the
                  operation of the Building or the Land or the provision of
                  services to lessees, including, but not limited to:

                  (a)   all salaries, wages, fringe benefits, payroll taxes and
                        workmen's compensation insurance premiums related
                        thereto of and for employees engaged in the operation of
                        the Building and the Land (with respect to employees who
                        are engaged in the operation of other properties as well
                        as the Building and the Land, these amounts shall be
                        pro-rated on the basis of the relative amount of time
                        spent by such employees on the various properties);

                  (b)   painting, repairs, maintenance and cleaning of all
                        Common Areas;

                  (c)   utilities (including, without limitation, electricity,
                        steam, water, sewer and gas) for all interior Common
                        Areas and lighting of exterior areas and the "Parking
                        Area" (as defined in Section 9.0 below);

                  (d)   maintenance and repair of the Building heating and
                        cooling systems, the plumbing systems, the fire
                        detection and suppression systems, the electrical system
                        and the elevators;

                  (e)   all maintenance, janitorial, and service agreements;

                  (f)   all insurance, including the cost of casualty and
                        liability insurance applicable to the Parking Area, the
                        Land, the Building and Lessor's personal


                                       -7-

                        property used in connection therewith, including the
                        amount of any reasonable deductible payable by Lessor in
                        making repairs and restoration after a casualty;

                  (g)   maintenance of landscaped areas and paved areas, and
                        snow removal;

                  (h)   maintenance of the Building security system;

                  (i)   management fees, PROVIDED THAT such fees are paid at
                        rates which are competitive with those commonly charged
                        for the management of comparable properties in
                        Cambridge, Massachusetts;

                  (j)   capital items which are for the purpose of reducing
                        Operating Expenses or upgrading services or which are at
                        any time required by a governmental authority or the
                        provisions of any insurance policy which is first
                        adopted or first becomes applicable to the Premises, the
                        Building or the Land after the date of this Lease,
                        amortized over the reasonable life of the capital items
                        on a straight line basis with the reasonable life being
                        determined by Lessor in accordance with generally
                        accepted accounting principles;

                  (k)   reasonable expenses incurred in pursuing an application
                        for an abatement of Taxes pursuant to Section 5.4 below
                        to the extent not deducted from the abatement, if any,
                        received; and

                  (l)   legal (excluding legal fees with respect to lease
                        negotiations and enforcement of lease terms against
                        other lessees), accounting and other professional fees
                        and disbursements (excluding leasing commissions).

                  For so long as Lessee is the sole occupant of the Building,
                  Lessee shall be responsible for one hundred percent (100%) of
                  Operating Expenses.

            5.3   PAYMENT OF TAXES AND OPERATING EXPENSES. Within a reasonable
                  time after the Commencement Date, and thereafter within a
                  reasonable time after the end of each fiscal year of the
                  Lessor (or portion thereof) included in the Term, Lessor shall
                  deliver to Lessee (i) a statement of actual Operating Expenses
                  and Taxes for the fiscal year just ended, together with
                  reasonable supporting documentation therefor, and (ii) a
                  budget of Operating Expenses and Taxes for the then-current
                  fiscal year based on the actual Operating Expenses and Taxes
                  for the preceding year and projected increases or


                                       -8-

                  decreases reasonably anticipated by Lessor. Commencing on the
                  first day of the first calendar month after the delivery to
                  Lessee of such budget, Lessee shall pay to Lessor, as
                  Additional Rent, on account of its share of anticipated
                  Operating Expenses for the then-current year, 1/12th of the
                  total annualized amount of Lessee's share of Operating
                  Expenses and shall pay to Lessor, as and when set forth in
                  Section 3.1, the appropriate percentage of Taxes. Lessor
                  reserves the right to revise the budget during any fiscal year
                  to cause it to more accurately reflect the actual Taxes or
                  Operating Expenses being paid or incurred by Lessor, and upon
                  any such revision the parties shall make adjustments in the
                  same time and manner as hereinafter provided for fiscal
                  year-end adjustments. Upon delivery to Lessee of the statement
                  of actual Operating Expenses and Taxes for the preceding
                  fiscal year, Lessor shall adjust Lessee's account accordingly.
                  If the total amount paid by Lessee on account of the preceding
                  fiscal year is less than the amount due hereunder, Lessee
                  shall pay the balance due within twenty (20) days after
                  delivery by Lessor of such statement. If the total amount paid
                  by Lessee on account of the preceding fiscal year exceeds the
                  amount due hereunder, such excess shall be credited by Lessor
                  against the monthly installments of Additional Rent next
                  falling due or refunded to Lessee upon the expiration or
                  termination of this Lease (unless such expiration or
                  termination is the result of an "Event of Default" (as defined
                  in Section 13.1 below)). Lessor's current fiscal year is July
                  1 - June 30, but Lessor reserves the right to change the
                  fiscal year at any time during the Term.

            5.4   ABATEMENT OF TAXES. Lessor or Lessee may at any time and from
                  time to time make application to the appropriate governmental
                  authority for an abatement of Taxes. If such an application is
                  successful, Lessor shall (a) deduct from the amount of the
                  abatement all expenses incurred by it in connection with the
                  application, (b) pay to Lessee Lessee's pro rata share of the
                  abatement, with interest, if any, paid by the governmental
                  authority on such share, and (c) retain the balance, if any;
                  PROVIDED THAT, if Lessee made the application for such
                  abatement, Lessor shall pay to Lessee out of the proceeds
                  thereof Lessee's reasonable expenses incurred in connection
                  with the application before making the payment to Lessee
                  described in clause (b) of this Section or before Lessor
                  retains the amount described in clause (c) of this Section.
                  Lessor agrees to cooperate with Lessee in connection with an
                  application for an abatement of Taxes hereunder by Lessee at
                  no expense to the Lessor.


                                       -9-

      6.0   METERS FOR UTILITIES. Lessor reserves the right to install meters
            for all utilities provided to the Premises, at its own expense, and
            charge Lessee for Lessee's actual use of metered services as
            Additional Rent.

      7.0   Insurance

            7.1   PUBLIC LIABILITY INSURANCE. Lessee shall take out and maintain
                  in force throughout the Term (and for so long thereafter as
                  Lessee remains in occupancy) comprehensive public liability
                  insurance naming Lessor and persons claiming by, through or
                  under Lessor as additional insureds, against all claims and
                  demands for any injury to persons or property which may be
                  claimed to have occurred on the Premises, the Building, the
                  Land or on the ways adjoining the Land, in an amount which at
                  the beginning of the Term shall not be less than $1,000,000
                  for personal injury or death or property damage per
                  occurrence, and $3,000,000 in the aggregate for personal
                  injury or death or property damage, or such higher amounts as
                  Lessor thereafter determines to be consistent with sound
                  commercial practice in Cambridge. Such policy shall also
                  include contractual liability coverage covering Lessee's
                  liability assumed under this Lease.

            7.2   CASUALTY INSURANCE. (a) Lessee shall be responsible to provide
                  its own coverage during the Lease Term for fire, vandalism,
                  malicious mischief, extended coverage and so-called all risk
                  coverage insurance insuring (i) all items or components of
                  "Alterations" (as defined in Section 11.0(f) below) which
                  Lessee is by this Lease either entitled to or required to
                  remove upon the expiration or earlier termination of this
                  Lease, and (ii) "Lessee's Property" (as defined in Section
                  11.0(h) below). Lessor shall not carry any insurance
                  concurrent in coverage and contributing in the event of loss
                  with any insurance required to be furnished by Lessee
                  hereunder if the effect of such separate insurance would be to
                  reduce the protection or the payment to be made under Lessee's
                  insurance.

                  (b) During any construction or alteration of the Building by
                  the Lessee, Lessee shall keep in full force and effect all
                  risk builder's risk insurance against loss or damage on a
                  completed value non-reporting basis from such hazards and in
                  such amounts as Lessor may reasonably require.

            7.3   CERTIFICATE OF INSURANCE. The insurance required by Sections
                  7.1 and 7.2 above shall be placed with insurers reasonably
                  satisfactory to Lessor and authorized to do business in
                  Massachusetts. Such insurance shall provide


                                      -10-

                  that it shall not be amended or canceled with respect to the
                  additional insureds or certificate holders without twenty (20)
                  days' prior written notice to each of them. Lessee shall
                  furnish to Lessor certificates of insurance for all insurance
                  required to be maintained by Lessee under this Lease, together
                  with evidence satisfactory to Lessor of the payment of all
                  premiums for such policies. Lessee, at Lessor's request, shall
                  also deliver such certificates and evidence of payment of
                  premiums to the holder of any mortgage affecting the Land and
                  Building.

            7.4   LESSOR'S INSURANCE. Lessor shall take out and maintain in
                  force throughout the Term, in a company or companies
                  authorized to do business in Massachusetts, casualty insurance
                  on the Building (exclusive of "Lessee's Property" (as defined
                  in Section 11.0(h) below) and all "Alterations" (as defined in
                  Section 11.0(f) below) which Lessee is by this Lease either
                  entitled to or required to remove upon the expiration or
                  earlier termination of this Lease, as to which Lessee is
                  required to maintain insurance pursuant to Section 7.2 above)
                  in an amount equal to the full replacement value of the
                  Building (exclusive of foundations and those items set forth
                  in the preceding parenthetical in this sentence), covering all
                  risks of direct physical loss or damage and so-called
                  "extended coverage" risks. This insurance may be maintained in
                  the form of a blanket policy covering the Building as well as
                  other properties owned by Lessor. Notwithstanding the
                  foregoing provisions of this Section 7.4, Lessor shall have
                  the right, at any time during the Term, to self-insure all or
                  any portion of the coverages required by this Section.

            7.5   WAIVER OF SUBROGATION. To the extent to which a waiver of
                  subrogation clause is available, Lessor and Lessee shall
                  obtain a provision in all insurance policies carried by such
                  party covering the Premises, including but not limited to
                  contents, fire and casualty insurance, expressly waiving any
                  right on the part of the insurer against the other party. If
                  extra cost is chargeable for such provision, then Lessee shall
                  pay such extra charge. Notwithstanding the foregoing, with
                  respect to such portion of the Term during which Lessor elects
                  to self-insure under Section 7.4 above, then for purposes of
                  this Section 7.5, Lessor shall be deemed to have maintained
                  fire and all-risk coverage in an amount equal to one hundred
                  (100%) percent of the insurable value of the Building (subject
                  to the exceptions and exclusions set forth in Section 7.4
                  above) with a waiver of subrogation clause contained therein.


                                      -11-

            7.6   WAIVER OF RIGHTS. All claims, causes of action and rights of
                  recovery for any damage to or destruction of persons, property
                  or business which shall occur on or about the Premises, the
                  Building or the Land, which result from any of the perils
                  insured under any and all policies of insurance maintained by
                  Lessor or Lessee, are waived by each party as against the
                  other party, and the officers, directors, employees,
                  contractors, servants and agents thereof, regardless of cause,
                  including the negligence of the other party and its respective
                  officers, directors, employees, contractors, servants and
                  agents, but only to the extent of recovery, if any, under such
                  policy or policies of insurance; PROVIDED, HOWEVER, that (i)
                  this waiver shall be null and void to the extent that any such
                  insurance shall be invalidated by reason of this waiver, and
                  (ii) with respect to such portion of the Term during which
                  Lessor elects to self-insure under Section 7.4 above, then for
                  purposes of this Section 7.6, Lessor shall be deemed to have
                  maintained fire and all-risk coverage in an amount equal to
                  one hundred (100%) percent of the insurable value of the
                  Building (subject to the exceptions and exclusions set forth
                  in Section 7.4 above).

            8.0   ASSIGNMENT AND SUBLETTING. (a) Lessee shall not mortgage,
                  pledge, hypothecate, grant a security interest in, or
                  otherwise encumber this Lease or any sublease hereinafter
                  entered into by Lessee, or assign this Lease, or sublease the
                  Premises or any portion thereof (the term "sublease" shall be
                  deemed to include any arrangement pursuant to which a third
                  party is permitted by Lessee to occupy all or any portion of
                  the Premises), without obtaining, on each occasion, the prior
                  written consent of Lessor. Lessor agrees not to unreasonably
                  withhold or delay its consent to any request to assign or
                  sublet the Lessee interest hereunder.

                  (b) If Lessee wishes to assign this Lease or sublease all or
                  any portion of the Premises, Lessee shall so notify Lessor in
                  writing and request Lessor's consent thereto. Such notice
                  shall include (i) the name of the proposed assignee or
                  sublessee, (ii) a general description of the types of business
                  conducted by the proposed assignee or sublessee and a
                  reasonably detailed description of the business operations
                  proposed to be conducted in the Premises by such person or
                  entity, (iii) such financial information concerning the
                  proposed assignee or sublessee as Lessor may reasonably
                  require, and (iv) all terms and provisions upon which such
                  assignment or sublease is proposed to be made. Lessor shall
                  have thirty (30) days from the day on which it receives
                  Lessee's notice and such required information to give notice
                  to Lessee that either (i) Lessor consents to such assignment
                  or sublease, or (ii) Lessor withholds its consent to such
                  assignment or sublease, or (iii) where applicable, Lessor is


                                      -12-

                  exercising its right of recapture pursuant to paragraph (e)
                  below.

                  (c) If Lessor consents to an assignment or sublease: (i)
                  Lessee shall promptly deliver to Lessor a fully executed copy
                  of said assignment or sublease; (ii) after any such assignment
                  or sublease, Lessee shall remain primarily liable to Lessor
                  hereunder (which liability shall be joint and several with the
                  assignee or sublessee); and (iii) if the aggregate rent and
                  other amounts payable to Lessee under or in connection with
                  such assignment or sublease, after deduction of the costs
                  reasonably incurred by Lessee in entering into such assignment
                  or sublease (including, without limitation, reasonable
                  attorneys' fees and expenses, brokerage commissions, and
                  alteration costs amortized on a straight-line basis over the
                  term of such sublease or, in the case of an assignment, over
                  the remaining Term of this Lease), exceeds the Rent payable
                  hereunder with respect to the portion of the Premises subject
                  to such sublease (or, in the case of an assignment, the entire
                  Premises), Lessee shall pay to Lessor, as Additional Rent,
                  one-half (1/2) of such excess immediately upon receipt thereof
                  by Lessee.

                  (d) If Lessor withholds its consent to such assignment or
                  sublease, Lessee shall not enter into the proposed assignment
                  or sublease with such person or entity.

                  (e) If Lessor elects, it shall have the right to consider
                  Lessee's request for Lessor's consent to any assignment of the
                  Lease, or a request for Lessor's consent to a sublease which
                  either (i) has a proposed term (including extension options)
                  of two years or more, or (ii) would cover twenty-five (25%)
                  percent of the rentable area of the Premises or more, as an
                  offer to Lessor to release from this Lease that portion of the
                  Premises which is proposed to be the subject of such sublease
                  for the term of such proposed sublease or, in the case of a
                  proposed assignment of this Lease, the entire Premises for the
                  entire Lease Term. If Lessor accepts such offer, then (i) in
                  the case of a proposed sublease, this Lease shall be deemed to
                  be amended as of the proposed effective date of such sublease
                  so as to delete the portion of the Premises which would have
                  been subject thereto from the Premises for purposes of this
                  Lease (with a commensurate adjustment in Rent and Lessee's
                  share of Taxes and Operating Expenses) for the time period of
                  what would have been the term of such sublease, or (ii) in the
                  case of a proposed assignment, this Lease shall terminate as
                  of the proposed effective date of such assignment as if such
                  date was the last day of the Term.

                  (f) Regardless of whether Lessor grants such consent, Lessee
                  shall reimburse Lessor on demand, as Additional Rent, for all


                                      -13-

                  out of pocket costs and expenses (including, without
                  limitation, attorneys' fees) reasonably incurred by Lessor in
                  responding to a request for such consent.

                  (g) Lessee shall not be entitled to enter into any assignment
                  or sublease, or to request Lessor's consent thereto, during
                  the continuance of a default hereunder by Lessee.

                  (h) Any assignment or sublease entered into pursuant to this
                  Section 8.0 shall be subject to all of the terms and
                  provisions of this Lease, including without limitation this
                  Section 8.0. If Lessee enters into any such assignment or
                  sublease, Lessor may, at any time and from time to time after
                  the occurrence of a default hereunder, collect rent from such
                  assignee or sublessee, and apply the net amount collected
                  against Lessee's obligations hereunder, but no such assignment
                  or sublease or collection shall be deemed an acceptance by
                  Lessor of such assignee or sublessee as a lessee hereunder or
                  as a release of the original named Lessee hereunder.

                  (i) Notwithstanding anything contained in this Lease, Lessee
                  shall not enter into any assignment or sublease with any
                  person or entity if the identity of the assignee or sublessee
                  is inconsistent with the investment policies of Lessor as set
                  forth in writing by the Executive Committee of Lessor prior to
                  its receipt of Lessee's notice of such proposed assignment or
                  sublease, and any such transaction shall be void AB INITIO.

                  (j) In the event that Lessee desires to assign this Lease or
                  to sublease the Premises (or any portion thereof) to any
                  corporation, partnership, association or other business
                  organization directly or indirectly controlling or controlled
                  by Lessee or under common control with Lessee, or to any
                  successor by merger, consolidation or purchase of all or
                  substantially all of the assets of Lessee, Lessee shall give
                  at least twenty (20) days' prior written notice thereof to
                  Lessor (unless Lessee is prohibited by applicable laws, codes,
                  rules or regulations, or by the terms of the operative merger
                  agreement or purchase and sale agreement from providing notice
                  to Lessor at such time, in which event such notice shall be
                  provided to Lessor as soon as Lessee is no longer subject to
                  such prohibition). No consent of Lessor shall be required for
                  any such assignment or sublease EXCEPT that Lessor shall have
                  the right to withhold its consent if the identity of the
                  assignee or sublessee is inconsistent with the investment
                  policies identified in the foregoing paragraph (i) of this
                  Section. Any assignee or sublessee which claims an interest in
                  this Lease pursuant to a transfer of the type described in
                  this paragraph (j) shall be bound by all of the terms and
                  conditions of this Lease including, without limitation, those
                  of the foregoing paragraph (i) of


                                      -14-

            this Section, and if the identity of such assignee or successor is
            inconsistent with such investment policies, Lessor shall have the
            right to terminate this Lease and to exercise against such assignee
            or sublessee the remedies available to Lessor under this Lease, at
            law or in equity for a breach of the provisions hereof by Lessee.
            For the purpose of this Lease, the sale of Lessee's capital stock
            through any public exchange shall not be deemed an assignment or
            sublease of the Lease or of the Premises.


            (k)   Notwithstanding anything contained in this Lease, Lessee shall
                  not, either voluntarily or by operation of law, make any
                  transfer of this Lease or the Premises (or any portion
                  thereof) which results in Lessee (or anyone claiming by,
                  through or under Lessee) collecting in connection with the
                  Premises any rental or other charge based on the net income or
                  on the profits of any person so as to render any part of the
                  Rent due hereunder "unrelated business taxable income" of
                  Lessor as described in Section 512 of the Internal Revenue
                  Code of 1986, as amended, and any such transfer shall be void
                  AB INITIO.


      9.0   PARKING. Lessee shall have the right to use 100 parking spaces in
            the parking area on the Land (the "Parking Area") to serve the
            Premises. The remaining parking spaces on the Land shall be divided
            equally to serve the third and fourth floors of the Building. If
            Lessee exercises its option or right of first refusal with respect
            to one or both of the third and fourth floors under Sections 1.3 or
            1.4, Lessee will thereby acquire the right to use the corresponding
            number of additional parking spaces. While Lessee is constructing
            its initial build out, Lessor will, if necessary, make additional
            spaces available to Lessee to accommodate construction personnel and
            their vehicles.


      10.0  LATE PAYMENT OF RENT. Lessee agrees that in the event that any
            payment of Basic Rent or Additional Rent shall remain unpaid at the
            close of business on the tenth business day after the same is due
            and payable hereunder (without reliance on any applicable grace
            period), such payment shall bear interest from the date the same was
            due at a rate equal to the "Prime Rate" as published from time to
            time in THE WALL STREET JOURNAL while such payment is overdue PLUS
            four (4%) percent, which shall be due and payable by Lessee as
            Additional Rent as compensation for Lessor's extra administrative
            costs in investigating the circumstances of late Rent. The
            assessment or collection of such a charge shall not be deemed to be
            a waiver by Lessor of any default by Lessee arising out of such
            failure to pay Rent when due.


      11.0  LESSEE'S COVENANTS. Lessee covenants, at its sole cost and expense,
            during the Term and such further time as Lessee occupies any part of
            the Premises:


                                      -15-

            (a)   to pay when due the Basic Rent and all Additional Rent, and,
                  if separately metered at any time during the Term, all charges
                  for electricity and other utilities;


            (b)   damage by fire or casualty and reasonable wear and tear only
                  excepted, to keep the Premises (including window glass) in as
                  good order, repair and condition as the same are in at the
                  commencement of the Term, or may be put in thereafter;


            (c)   not to injure, overload or deface the Premises or the
                  Building, nor to suffer or commit any waste therein, nor to
                  place a load upon any floor which exceeds the floor load which
                  the floor was designed to carry, nor to connect any equipment
                  or apparatus to any Building system (e.g., electrical,
                  plumbing, mechanical) which exceeds the capacity of such
                  system, nor to permit on the Premises any auction sale or any
                  nuisance or the emission therefrom of any objectionable
                  vibration, noise, or odor, nor to permit the use of the
                  Premises for any purpose other than the Permitted Uses, nor
                  any use thereof which is improper, offensive, or contrary to
                  any laws, ordinances, codes, rules and regulations, or the
                  provisions of any license, permit or other governmental
                  consent or approval required for or applicable now or at any
                  time during the Term to the Land, the Building or the Premises
                  or Lessee's use thereof (collectively, "Legal Requirements"),
                  or which is liable to invalidate or increase the premiums for
                  any insurance on the Building or its contents, or liable to
                  render necessary any alterations or additions to the Building;


            (d)   not to obstruct in any manner any portion of the Building not
                  hereby leased, or the sidewalks or approaches to the Building,
                  or the Parking Area, or any hallways or Common Areas, and to
                  conform to all reasonable rules now or hereafter made by
                  Lessor for the care and use of the Building, its facilities
                  and approaches;


            (e)   to comply with all Legal Requirements and all recommendations
                  of Lessor's fire insurance rating organization now or
                  hereafter in effect, to keep the Premises equipped with all
                  safety appliances, and to procure (and maintain in full force
                  and effect) all licenses, permits and other governmental
                  consents and approvals required by any Legal Requirement or by
                  the provisions of any applicable insurance policy because of
                  the use made of the Premises by Lessee (without hereby
                  intending to vary the provisions of Section 4.0 above), and,
                  if requested by Lessor, to make all repairs, alterations,
                  replacements or additions so required in and to the Premises;


                                      -16-

            (f)   except as set forth in Section 1.5, Section 14 or this Section
                  11.0(f), not, without on each occasion obtaining the prior
                  written consent of Lessor which will not be unreasonably
                  withheld or delayed, to make any alterations, renovations,
                  improvements and/or additions to the Premises (collectively,
                  "Alterations"), or to permit the making of any holes in any
                  part of the Building or the painting or placing of any signs,
                  awnings, or the like, visible from outside of the Premises;
                  PROVIDED THAT Lessee may, without such approval, make
                  Alterations which will neither (i) materially affect the
                  structure of the Premises or its building service systems or
                  (ii) cost more than $25,000 to construct ("Minor
                  Alterations"). Prior to commencing any Alterations, Lessee
                  shall: secure all necessary licenses, permits and other
                  governmental consents and approvals; except for Minor
                  Alterations, obtain the written approval of Lessor as to the
                  plans and specifications for such work; except for Minor
                  Alterations, obtain the written approval of Lessor as to the
                  general contractor (or as to each trade contractor if there is
                  no general contractor); cause each contractor and
                  subcontractor to carry workmen's compensation insurance in
                  statutory amounts covering all of the contractor's and
                  subcontractor's employees; and cause each general contractor
                  (or each trade contractor if there is no general contractor)
                  and subcontractor to carry comprehensive public liability
                  insurance in amounts reasonably satisfactory to Lessor (such
                  insurance to be written by companies reasonably satisfactory
                  to Lessor and insuring Lessee and Lessor as well as the
                  contractors and subcontractors). All Alterations shall be
                  performed in a good and workmanlike manner consistent with
                  existing conditions within the Building and shall be of a
                  quality equal to or better than existing conditions. Lessor
                  and Lessee hereby agree that Lessee's Work as described in
                  Exhibit B shall remain part of the Premises upon the
                  expiration or earlier termination of the Term. All other
                  Alterations (other than Lessee's removable personal property
                  and trade fixtures) shall remain part of the Premises and
                  shall not be removed upon the expiration or earlier
                  termination of the Term EXCEPT for those items which Lessor
                  designates for removal in a notice given to Lessee at the time
                  that Lessee requests Lessor's approval of such Alteration.
                  Lessee shall pay promptly when due the entire cost of all
                  work. Lessee shall not cause or permit any liens for labor or
                  materials performed or furnished in connection therewith to
                  attach to the Land or the Building, and shall discharge or
                  bond any such liens which may be filed or recorded against the
                  Premises within fifteen (15) days after the filing


                                      -17-

                  or recording thereof. All such work shall be performed in
                  compliance with all Legal Requirements and the provisions of
                  all applicable insurance policies. Promptly after the
                  completion of any Alterations, Lessee shall provide a complete
                  set of as-built plans thereof to Lessor showing all work
                  performed, including, without limitation, plans for all
                  partitions, plumbing, electric service equipment and wiring,
                  HVAC equipment and piping, sprinkler systems and other
                  services installed or modified. Lessee shall indemnify and
                  hold Lessor harmless from and against any and all suits,
                  demands, causes of action, claims, losses, debts, liabilities,
                  damages, penalties or judgments, including, without
                  limitation, reasonable attorneys' fees, arising from injury to
                  any person or property occasioned by or growing out of such
                  work, which indemnity shall survive the expiration or
                  termination of this Lease;

            (g)   to save Lessor harmless and indemnified from any loss, cost
                  and expense (including, without limitation, reasonable
                  attorneys' fees) arising out of or relating to (i) a claim of
                  injury to any person or damage to any property while on the
                  Premises, if not due to the negligence or willful misconduct
                  of Lessor or its officers, agents, employees, servants or
                  contractors, or the breach of Lessor's obligations under this
                  Lease; or to (ii) a claim of injury to any person or damage to
                  any property anywhere alleged to be occasioned by any
                  omission, neglect or default of Lessee or of anyone claiming
                  by, through, or under Lessee, or any officer, agent, employee,
                  servant, contractor or invitee of any of the foregoing. Lessor
                  agrees to indemnify and hold harmless Lessee from and against
                  all loss, cost and expense (including, without limitation,
                  reasonable attorneys' fees) arising out of or relating to a
                  claim for personal injury or property damage resulting from
                  the negligence or willful misconduct of Lessor or its
                  officers, agents, employees, servants or contractors,
                  including claims of injury to any person or damage to any
                  property while on the common areas on the property, if due to
                  the negligence or willful misconduct of Lessor or its
                  officers, agents, employees, servants or contractors, or from
                  the breach of Lessor's obligations or representations under
                  this Lease. The provisions of this clause (g) shall survive
                  the expiration or termination of this Lease;

            (h)   that all furniture, furnishings, fixtures and property of
                  every kind of Lessee and of all persons claiming by, through
                  or under Lessee which may be on the Premises from time to time
                  (collectively, "Lessee's Property") shall be at the sole risk
                  of Lessee, and Lessor shall


                                      -18-

                  not be liable if the whole or any part thereof shall be
                  destroyed or damaged by fire, water or otherwise, or by the
                  leakage or bursting of water pipes, steam pipes, or other
                  pipes, or by theft or from any other cause unless caused by
                  the negligence or willful misconduct of Lessor, or its
                  officers, agents, employees, servants or contractors;

            (i)   to pay promptly when due, all taxes of any kind levied,
                  imposed or assessed on Lessee's Property, which taxes shall be
                  the sole obligation of Lessee, whether the same is assessed to
                  Lessee or to any other person and whether the property on
                  which such tax is levied, imposed or assessed shall be
                  considered part of the Premises or personal property;

            (j)   by the end of business on the last day of the Term (or the
                  effective date of any earlier termination of this Lease as
                  herein provided), to remove (1) all of Lessee's Property and
                  (2) the items or components of Alterations designated for
                  removal as provided in paragraph (f) above, in each case
                  whether the same be permanently affixed to the Premises or
                  not, and to repair any damage caused by any such removal to
                  Lessor's reasonable satisfaction; and peaceably to yield up
                  the Premises clean and in good order, repair and condition
                  (reasonable wear and tear, and damage by fire or other
                  casualty or taking which Lessee is not otherwise required by
                  the terms of this Lease to repair or replace only excepted);
                  and to deliver the keys to the Premises to Lessor. Any of
                  Lessee's Property or those Alterations designated for removal
                  as provided in paragraph (f) above which are not removed by
                  such date shall be deemed abandoned and may be removed and
                  disposed of by Lessor in such manner as Lessor may determine,
                  and Lessee shall pay to Lessor on demand, as Additional Rent,
                  the entire cost of such removal and disposition, together with
                  the costs and expenses incurred by Lessor in making any
                  incidental repairs and replacements to the Premises
                  necessitated by Lessee's failure to remove Lessee's Property
                  or those Alterations designated for removal as provided in
                  paragraph (f) above, as required herein or by any other
                  failure of Lessee to comply with the terms of this Lease, and
                  for use and occupancy during the period after the expiration
                  of the Term and prior to Lessee's performance of its
                  obligations under this paragraph (k). Lessee shall further
                  indemnify and hold Lessor harmless from and against any and
                  all suits, demands, causes of action, claims, losses, debts,
                  liabilities, damages, penalties or judgments, including,
                  without limitation, reasonable attorneys' fees, resulting from
                  Lessee's failure or


                                      -19-

                  delay in surrendering the Premises as above provided (such
                  indemnity to survive the expiration or termination of this
                  Lease);

            (k)   to pay Lessor's reasonable expenses, including reasonable
                  attorneys' fees, incurred in enforcing any obligations of
                  Lessee under this Lease;

            (l)   not to generate, store or use any "Hazardous Materials" (as
                  hereinafter defined) in or on the Premises or elsewhere in the
                  Building or on the Land except those identified in writing to
                  Lessor from time to time, and then only in compliance with any
                  and all applicable Legal Requirements, or dispose of Hazardous
                  Materials from the Premises to any other location except a
                  properly approved disposal facility and then only in
                  compliance with any and all Legal Requirements regulating such
                  activity, nor permit any occupant of the Premises to do so. As
                  used in this Lease, "Hazardous Materials" means and includes
                  any chemical, substance, waste, material, gas or emission
                  which is radioactive or deemed hazardous, toxic, a pollutant,
                  or a contaminant under any statute, ordinance, by-law, rule,
                  regulation, executive order or other administrative order,
                  judgment, decree, injunction or other judicial order of or by
                  any governmental authority, now or hereafter in effect,
                  relating to pollution or protection of human health or the
                  environment. By way of illustration and not limitation,
                  "Hazardous Materials" includes "oil", "hazardous materials",
                  "hazardous waste", and "hazardous substance" as defined in the
                  Comprehensive Environmental Response, Compensation and
                  Liability Act, 42 U.S.C. Section 9601 ET SEQ., as amended, the
                  Resource Conservation and Recovery Act of 1976, 42 U.S.C.
                  Section 6902 ET SEQ., as amended, and the Toxic Substances
                  Control Act, 15 U.S.C. 8601 ET SEQ., as amended, the
                  regulations promulgated thereunder, and Massachusetts General
                  Laws, Chapter 21C and Chapter 21E and the regulations
                  promulgated thereunder. If, at any time during the Term, any
                  governmental authority requires testing to determine whether
                  there has been any release of Hazardous Materials by Lessee or
                  anyone claiming by, through or under Lessee, then Lessee shall
                  reimburse Lessor upon demand, as Additional Rent, for the
                  reasonable costs thereof. Lessee shall execute affidavits,
                  certifications and the like, as may be reasonably requested by
                  Lessor from time to time concerning Lessee's best knowledge
                  and belief concerning the presence of Hazardous Materials in
                  or on the Premises, the Building or the Land. Lessor reserves
                  the right to enter the Premises at reasonable times (provided
                  twenty-four (24) hours' notice is given to


                                      -20-

                  Lessee, except in case of emergency) to inspect the same for
                  Hazardous Materials. Lessee's obligations under this paragraph
                  (l) shall include, if at any time during the Term Lessee or
                  anyone claiming by, through or under Lessee uses or stores
                  radioactive materials on the Premises, compliance with all
                  so-called "close-out" procedures of the Nuclear Regulatory
                  Commission or other federal, state or local governmental
                  authorities having jurisdiction over radioactive materials,
                  regardless of whether or not such procedures are completed
                  prior to the expiration or earlier termination of the Term.
                  Lessee shall indemnify, defend, and hold harmless Lessor, and
                  the holder of any mortgage on the Building or the Land, from
                  and against any claim, cost, expense, liability, obligation or
                  damage, including, without limitation, attorneys' fees and the
                  cost of litigation, arising from or relating to the breach by
                  Lessee or anyone claiming by, through or under Lessee of the
                  provisions of this paragraph (l), and shall immediately
                  discharge or cause to be discharged any lien imposed upon the
                  Building or the Land in connection with any such claim. The
                  provisions of this paragraph (l) shall survive the expiration
                  or termination of this Lease;

            (m)   in case Lessee takes possession of the Premises prior to the
                  Commencement Date, to perform and observe all of Lessee's
                  covenants from and after the date upon which Lessee takes
                  possession except that no Rent shall accrue prior to the Rent
                  Commencement Date;

            (n)   to comply with all rules and regulations adopted and amended
                  from time to time by Lessor for the operation of the Land and
                  the Building; and

            (o)   not to permit any officer, agent, employee, servant,
                  contractor or visitor of Lessee, or of anyone claiming by,
                  through or under Lessee, to violate any covenant or obligation
                  of Lessee hereunder.

      12.0  Casualty and Eminent Domain.

            12.1  SUBSTANTIAL TAKING. In the event that the entire Building, or
                  more than fifty percent (50%) percent of the rentable area of
                  the Premises or of the parking spaces which the Lessee is
                  entitled to use under Section 9.0, shall be taken by any
                  exercise of the right of eminent domain or other lawful power
                  in pursuance of any public or other authority during the Term,
                  then this Lease shall terminate as of the time that possession
                  is taken by the taking authority.

            12.2  PARTIAL TAKING. In the event that a taking occurs and this
                  Lease is not terminated as provided in Section 12.1


                                      -21-

                  above, then from and after the date possession is taken by the
                  taking authority Rent shall be abated by an amount
                  representing that part of the Rent properly allocable to the
                  portion of the Premises so taken, but this Lease shall
                  otherwise continue in full force and effect.

            12.3  AWARDS. Lessor reserves and excepts all rights to damage to
                  the Premises, the Building, the Land and the leasehold hereby
                  created, now accrued or hereafter accruing by reason of any
                  exercise of eminent domain, or by reason of anything lawfully
                  done in pursuance of any public or other authority and by way
                  of confirmation, Lessee grants to Lessor all of Lessee's
                  rights to such damages and covenants to execute and deliver
                  such further instruments of assignment thereof as Lessor may
                  from time to time request. Lessor agrees, during the Initial
                  Term only, to pay to Lessee out of the damages received, the
                  Unamortized Value of Lessee's Work. The Unamortized Value of
                  Lessee's Work shall mean the Value of Lessee's Work reduced
                  annually at the end of each year of the Initial Term by one
                  fifth of the initial amount thereof. The Value of Lessee's
                  Work shall mean the cost to Lessee of constructing Lessee's
                  Work reduced by soft costs.

            12.4  SUBSTANTIAL CASUALTY. If the Premises are damaged by fire or
                  other casualty, Lessee shall promptly notify Lessor thereof.
                  If the Building or any part thereof shall be damaged by fire
                  or other casualty to the extent that substantial alteration or
                  reconstruction of the Building shall, in Lessor's sole
                  opinion, be required (whether or not the Premises shall have
                  been damaged), or if such casualty renders more than fifty
                  (50%) percent of the rentable area of the Premises unusable by
                  Lessee for the operation of its business in the Premises, or
                  if as a result of such casualty any mortgagee of the Building
                  requires that insurance proceeds payable in connection with
                  such casualty be used to retire the mortgage debt, then,
                  except as set forth in Section 12.5, Lessor may, at its
                  option, terminate this Lease by notifying Lessee in writing of
                  such termination within sixty (60) days after the date of such
                  damage, in which event this Lease shall terminate on the date
                  set forth in such notice. If such casualty renders more than
                  fifty (50%) percent of the rentable area of the Premises
                  unusable by Lessee for the operation of its business in the
                  Premises, in the reasonable determination of Lessee, then
                  Lessee may terminate this Lease by written notice thereof to
                  Lessor within sixty (60) days after the date of such damage,
                  or if, after such casualty, Lessor is excused from restoring
                  the Premises under Section 12.5 and notifies


                                      -22-

                  Lessee that it will not restore the Premises, then Lessee may
                  terminate this Lease by written notice thereof to Lessor
                  within thirty (30) days after receipt of such notice by the
                  Lessee. In the event that this Lease is terminated pursuant to
                  this Section 12.4, Rent shall be abated, to the extent the
                  Premises are unusable for the Permitted Uses, from and after
                  the date of such damage to the date of such termination of
                  this Lease, and no further Rent shall accrue or be payable
                  after the date of such termination.

            12.5  REPAIR AND RESTORATION. In the event of a taking which does
                  not result in the termination of this Lease pursuant to
                  Section 12.1 above, or a casualty which does not result in the
                  termination of this Lease pursuant to Section 12.4 above, or
                  if, notwithstanding the occurrence of a substantial casualty
                  described in Section 12.4, Lessor decides not to demolish the
                  Building, the Premises shall be repaired and restored in the
                  manner provided in this Section. Lessor shall diligently act
                  to restore the Building and the Premises (exclusive of all
                  items or components of Alterations which Lessee is by this
                  Lease either entitled to or required to remove upon the
                  expiration or earlier termination of this Lease, and Lessee's
                  Property) or, in case of taking, what remains thereof, to
                  substantially the condition in which they existed prior to the
                  occurrence of such taking or casualty, PROVIDED, HOWEVER,
                  that: (i) in no event shall Lessor be required to spend in
                  connection with restoring the Premises more than the amount of
                  insurance proceeds or taking award actually received and
                  allocable thereto (except that this limitation with respect to
                  insurance proceeds shall not apply to casualties occurring
                  during such time as Lessor self-insures pursuant to Section
                  7.4 above); (ii) Lessor shall not be required to restore or
                  replace any Alterations which Lessee is by this Lease either
                  entitled to or required to remove upon the expiration or
                  earlier termination of this Lease; and (iii) Lessor shall not
                  be required to restore or replace any of Lessee's Property.
                  Lessor shall not be liable for any inconvenience or annoyance
                  to Lessee or injury to the business of Lessee resulting in any
                  way from such taking or damage or the repair thereof. Rent
                  shall be abated from and after the date of such taking or
                  damage to the date on which Lessor substantially completes the
                  restoration described above, to the extent the Premises are
                  unusable for the Permitted Uses.

      13.0  Defaults; Events of Default; Remedies.

            13.1  DEFAULTS; EVENTS OF DEFAULT. The following shall, if any
                  requirement for notice or lapse of time or both has


                                      -23-

                  not been met, constitute defaults hereunder, and, if such
                  requirements have been met, constitute "Events of Default"
                  hereunder:

                  (a)   The failure of Lessee to perform or observe any of
                        Lessee's covenants or agreements hereunder concerning
                        the payment of money for a period of ten (10) days after
                        written notice thereof, PROVIDED, HOWEVER, that Lessee
                        shall not be entitled to such notice if Lessor has given
                        notice to Lessee of two or more previous such failures
                        within a twelve-month period, in which event such
                        failure shall constitute an Event of Default hereunder
                        upon the expiration of ten (10) days after such payment
                        was due;

                  (b)   The failure of Lessee to maintain the insurance required
                        hereunder in full force and effect;

                  (c)   The execution by Lessee of any assignment or sublease
                        without the prior written consent of Lessor;

                  (d)   The failure of Lessee to perform or observe any of
                        Lessee's other covenants or agreements hereunder for a
                        period of thirty (30) days after written notice thereof
                        (PROVIDED THAT, in the case of defaults not reasonably
                        curable in thirty (30) days through the exercise of
                        reasonable diligence, such 30-day period shall be
                        extended for so long as Lessee commences cure within
                        such period and thereafter prosecutes such cure to
                        completion continuously and with reasonable diligence;
                        or

                  (e)   If the leasehold hereby created shall be taken on
                        execution, or by other process of law; or if any
                        assignment shall be made of Lessee's property for the
                        benefit of creditors; or if a receiver, guardian,
                        conservator, trustee in bankruptcy or similar officer
                        shall be appointed to take charge of all or any part of
                        Lessee's assets by a court of competent jurisdiction; or
                        if a petition is filed by Lessee under any bankruptcy or
                        insolvency law; or if a petition is filed against Lessee
                        under any bankruptcy or insolvency law and the same
                        shall not be dismissed within sixty (60) days from the
                        date upon which it is filed; or a lien or other
                        involuntary encumbrance is filed against Lessee's
                        leasehold (or against the Premises, the Building or the
                        Land based on a claim against Lessee) and is not
                        discharged or bonded within thirty (30) days after the
                        filing thereof.

            13.2  TERMINATION. If an Event of Default shall occur, Lessor may,
                  at its option, immediately or any time thereafter


                                      -24-

                  and without demand or notice, enter upon the Premises or any
                  part thereof in the name of the whole and repossess the same
                  as of Lessor's former estate and dispossess Lessee and those
                  claiming through or under Lessee and remove their effects,
                  forcibly if necessary, without being deemed guilty of any
                  manner of trespass and without prejudice to any remedies which
                  might otherwise be used for arrears of rent or preceding
                  breach of covenant, and upon such entry this Lease shall
                  terminate. In lieu of making such entry, Lessor may terminate
                  this Lease upon three (3) business days' prior written notice
                  to Lessee. Upon any termination of this Lease as the result of
                  an Event of Default, Lessee shall quit and peacefully
                  surrender the Premises to Lessor.

            13.3  SURVIVAL OF COVENANTS. No such termination of this Lease shall
                  relieve Lessee of its liability and obligations under this
                  Lease and such liability and obligations shall survive any
                  such termination. Lessee shall indemnify and hold Lessor
                  harmless from all loss, cost, expense, damage or liability
                  arising out of or in connection with such termination.

            13.4  DAMAGES. In the event of any such termination, Lessee shall
                  pay to Lessor the Rent up to the time of such termination.
                  Lessee shall remain liable for, and shall pay on the days
                  originally fixed for such payment hereunder, the full amount
                  of all Basic Rent and Additional Rent as if this Lease had not
                  been terminated; PROVIDED, HOWEVER, if Lessor relets the
                  Premises, there shall be credited against such obligation the
                  amount actually received by Lessor each month from such lessee
                  after first deducting all costs and expenses incurred by
                  Lessor in connection with reletting the Premises and, if
                  Lessor has previously received a payment under the succeeding
                  paragraph of this Section 13.4, there shall be credited
                  against such obligation the amount actually received by
                  Lessor.

                  Lessee further agrees to pay to Lessor, on demand, as and for
                  liquidated and agreed damages for Lessee's default, the amount
                  by which:

                  (a)   the aggregate Rent which would have been payable under
                        this Lease by Lessee from the date of such termination
                        until what would have been the last day of the Term but
                        for such termination, EXCEEDS

                  (b)   the greater of (i) the fair and reasonable rental value
                        of the Premises for the same period, less Lessor's
                        reasonable estimate of expenses to be incurred in
                        connection with


                                      -25-

                        reletting the Premises, including, without limitation,
                        all repossession costs, brokerage commissions, legal
                        expenses, reasonable attorneys' fees, alteration costs,
                        and expenses of preparation for such reletting, or (ii)
                        the sum of (A) the amount actually received by Lessor
                        from reletting the Premises (if any) after payment of
                        such expenses, and (B) the amount actually received by
                        Lessor from Lessee pursuant to the preceding paragraph
                        of this Section (if any).

                  If the Premises or any part thereof are relet by Lessor for
                  the period prior to what would have been the last day of the
                  Term but for such termination, or any portion thereof, the
                  amount of rent reserved upon such reletting shall be, PRIMA
                  FACIE, the fair and reasonable rental value for the part or
                  the whole of the Premises so relet during the term of the
                  reletting.

                  In lieu of any other damages hereunder, Lessor may by written
                  notice to Lessee, at any time after this Lease is so
                  terminated, elect to recover, and Lessee shall pay as full and
                  final liquidated damages, an amount equal to (i) the Basic
                  Rent and Additional Rent accrued under Section 5.0 hereof in
                  the twelve (12) months ending on the effective date of such
                  termination, PLUS (ii) all Basic Rent and Additional Rent
                  which was unpaid as of the effective date of such termination,
                  LESS (iii) the amount received by Lessor pursuant to the
                  foregoing provisions of this Section 13.4 prior to the time of
                  payment by Lessee of such liquidated damages.

                  Nothing herein contained shall limit or prejudice the right of
                  Lessor to prove and obtain as liquidated damages by reason of
                  such termination, an amount equal to the maximum allowed by
                  any statute or rule of law in effect at the time when, and
                  governing the proceedings in which, such damages are to be
                  proved, whether or not such amount be greater, equal to, or
                  less than the amount of the difference referred to above.

            13.5  RIGHT TO RELET. At any time or from time to time after any
                  such termination, Lessor may relet the Premises or any part
                  thereof for such a term (which may be greater or less than the
                  period which would otherwise have constituted the balance of
                  the Term) and on such conditions (which may include
                  concessions or free rent) as Lessor, in its reasonable
                  discretion, may determine, and may collect and receive the
                  rents therefor. Lessor shall in no way be responsible or
                  liable for any failure


                                      -26-

                  to relet the Premises or any part thereof, or for any failure
                  to collect any rent due upon any such reletting.

            13.6  RIGHT TO EQUITABLE RELIEF. In the event there shall occur a
                  default hereunder, Lessor shall be entitled to seek to enjoin
                  such default and shall have the right to invoke any right and
                  remedy allowed at law or in equity or by statute or otherwise
                  as though re-entry and other remedies were not provided for in
                  this Lease.

            13.7  RIGHT TO SELF HELP. In the event of a default by Lessee
                  hereunder which continues beyond the expiration of the
                  applicable grace period, Lessor shall have the right to
                  perform such defaulted obligation of Lessee, including the
                  right to enter upon the Premises to do so. Lessor shall, as a
                  courtesy only, notify Lessee of its intention to perform such
                  obligation. In the event of a default by Lessee hereunder
                  which has not yet continued beyond the expiration of the
                  applicable grace period but which Lessor determines
                  constitutes an emergency threatening imminent injury to
                  persons or damage to property, Lessor shall have the right to
                  perform such defaulted obligation of Lessee (including the
                  right to enter upon the Premises to do so) after giving Lessee
                  such notice (if any) as is reasonable under the circumstances.
                  In either event, the aggregate of (i) all sums so paid by
                  Lessor, (ii) interest (at the rate of 1-1/2% per month or the
                  highest rate permitted by law, whichever is less) on such sum,
                  and (iii) all necessary incidental costs and expenses in
                  connection with the performance of any such act by Lessor,
                  shall be deemed to be Additional Rent under this Lease and
                  shall be payable to Lessor immediately upon demand. Lessor may
                  exercise its rights under this Section 13.7 without waiving
                  any other of its rights or releasing Lessee from any of its
                  obligations under this Lease. If Lessor defaults on its
                  obligations hereunder after thirty (30) days notice thereof
                  or, in the event of an emergency, such notice as is reasonable
                  under the circumstances, and, as a result, Lessee is compelled
                  to pay, or reasonably elects to pay any sum of money or do any
                  act which will require the payment of a sum of money, or
                  incurs any reasonable expense to cure such default by Lessor,
                  any reasonable amounts so paid shall be due from Lessor to
                  Lessee, and Lessor shall pay such amount promptly to Lessee
                  upon receipt of a bill therefor. The right granted to Lessee
                  in this Section 13.7 is in addition to any other rights and
                  remedies Lessee may have at law or in equity.

            13.8  FURTHER REMEDIES. Nothing in this Lease contained shall
                  require Lessor to elect any remedy for a default or Event of
                  Default by Lessee hereunder, and all rights


                                      -27-

                  herein provided shall be cumulative with one another and with
                  any other rights and remedies which Lessor may have at law or
                  in equity in the case of such a default or Event of Default.

      14.0  CONSTRUCTION. Lessee shall have the right to make improvements to
            the Premises in order to make them suitable for use as a
            semi-conductor wafer manufacturing facility in accordance with the
            provisions of the Work Letter attached hereto as EXHIBIT B.

      15.0  LESSOR'S RIGHT OF ENTRY. Lessor reserves the right to enter the
            Premises on reasonable advance notice to the Lessee for the purpose
            of installing one or two elevators and installing or modifying the
            existing service systems in the Building in order to render
            tenantable the third and fourth floors of the Building; PROVIDED
            THAT Lessor shall cooperate with Lessee in order to minimize
            interference with Lessee's business operations. Lessor agrees that
            all work to install elevator(s) shall be commenced as soon as
            reasonably possible after the Commencement Date, and Lessor shall
            use reasonable efforts to complete the installation as soon as
            possible. Lessor and Lessor's agents shall have the right to enter
            the Premises at reasonable times (provided 24 hours' notice is given
            to Lessee, except in case of emergency), and if Lessor shall so
            elect (without hereby imposing any obligation on Lessor to do so),
            to permit Lessor to make any repairs or additions Lessor may deem
            necessary; and at Lessee's expense to remove any Alterations, signs,
            awnings, aerials, flagpoles or the like not consented to in writing
            or permitted hereunder; and to permit Lessor to show the Premises to
            prospective purchasers and lessees (at reasonable times on
            reasonable advance notice to Lessee) and to keep affixed to any
            suitable part of the Premises, during the nine (9) months preceding
            the expiration of the Term, appropriate notices for letting or
            selling.

      16.0  REAL ESTATE BROKER. Lessor and Lessee each represent to the other
            that they have dealt with no broker in connection with this Lease.
            Lessee agrees to indemnify and hold Lessor harmless from and against
            any claims for commissions or fees by reason of any act of Lessee or
            its representatives. Lessor agrees to indemnify and hold Lessee
            harmless from and against any claims for commissions or fees by any
            person by reason of any act of Lessor or its representatives.

      17.0  NOTICES. Whenever by the terms of this Lease notice, demand, or
            other communication shall or may be given either to Lessor or to
            Lessee, the same shall be in writing and shall be sent by hand
            delivery, or by registered or certified mail, postage prepaid, or by
            Federal Express or other similar overnight delivery service, to:


                                      -28-

           Lessor:                  Massachusetts Institute of Technology
                                    238 Main Street - Suite 200
                                    Cambridge, Massachusetts 02142
                                    Attention: Philip A. Trussell,
                                               Director of Real Estate

                  with a copy to:   Stuart T. Freeland, Esq.
                                    Rackemann, Sawyer & Brewster
                                    One Financial Center
                                    Boston, Massachusetts 02111


           Lessee:                  Analog Devices, Inc.
                                    One Technology Way
                                    P.O. Box 9106
                                    Norwood, MA  02062-9106
                                    Attention:  Chief Financial Officer

                  with a copy to:   Philip D. Stevenson, Esq.
                                    Hale and Dorr
                                    60 State Street
                                    Boston, MA  02109-1816


            Any notice, demand or other communication shall be effective upon
            receipt by or tender for delivery to the intended recipient thereof.

      18.0  NO WAIVERS. Failure of a party to complain of any act or omission on
            the part of the other party no matter how long the same may
            continue, shall not be deemed to be a waiver by such party of any of
            its rights hereunder. No waiver by a party at any time, expressed or
            implied, of any breach of any provision of this Lease shall be
            deemed a waiver of a breach of any other provision of this Lease or
            a consent to any subsequent breach of the same or any other
            provision. No acceptance by a party of any partial payment shall
            constitute an accord or satisfaction but shall only be deemed a
            partial payment on account; nor shall any endorsement or statement
            on any check or any letter accompanying any check or payment be
            deemed an accord and satisfaction, and the receiving party may
            accept such check or payment without prejudice to that party's right
            to recover the balance of such installment or pursue any other
            remedy available to such party in this Lease or at law or in equity.

      19.0  Ground Leases; Mortgages.

            19.1  RIGHTS OF GROUND LESSORS AND MORTGAGEES. No act or failure to
                  act on the part of Lessor which would entitle Lessee under the
                  terms of this Lease, or by law, to be relieved of Lessee's
                  obligations hereunder or to


                                      -29-

                  terminate this Lease, shall result in a release or termination
                  of such obligations or a termination of this Lease unless (i)
                  Lessee shall have first given written notice to Lessor's
                  ground lessors and mortgagees of the act or failure to act on
                  the part of Lessor which Lessee claims as the basis of
                  Lessee's rights; and (ii) such ground lessors and mortgagees,
                  after receipt of such notice, have failed or refused to
                  correct or cure the condition within a reasonable time
                  thereafter, but nothing in this Lease shall be deemed to
                  impose any obligation on any such ground lessor or mortgagee
                  to correct or cure any such condition. The foregoing sentence
                  shall apply only for the benefit of ground lessors and
                  mortgagees who have been identified to Lessee by a notice
                  given in accordance with Section 17. No ground lessor shall be
                  liable for the failure to perform any of the obligations of
                  Lessor hereunder unless and until such ground lessor
                  terminates its ground lease and takes possession of the
                  Premises, nor shall any mortgagee be liable for the failure to
                  perform any of the obligations of Lessor hereunder unless and
                  until such mortgagee enters upon and takes possession of the
                  Premises for purposes of foreclosure.

            19.2  LEASE SUBORDINATE. This Lease is and shall be subject and
                  subordinate to any ground lease or mortgage now or hereafter
                  on the Premises, and to all advances under any such mortgage
                  and to all renewals, amendments, extensions and consolidations
                  thereof, PROVIDED THAT the holder of such ground lessor's
                  interest or mortgagee's interest enters into a non-disturbance
                  and attornment agreement with Lessee which provides that in
                  the event that such ground lessor or mortgagee succeeds to
                  Lessor's interest hereunder, then, PROVIDED THAT Lessee is not
                  in default hereunder beyond the cure period provided in this
                  Lease, such party shall recognize and be bound by the terms of
                  this Lease. In the event that any ground lessor or the holder
                  of any mortgage succeeds to Lessor's interest in the Premises
                  or any portion thereof, Lessee hereby agrees to attorn to such
                  ground lessor or mortgagee. In confirmation of such
                  subordination, Lessee shall execute and deliver promptly any
                  certificate in recordable form that Lessor or any ground
                  lessor or any mortgagee may reasonably request.
                  Notwithstanding the foregoing provisions of this Section, the
                  holder of any mortgage on the Premises may at any time
                  subordinate its mortgage to this Lease by written notice to
                  Lessee. Lessor hereby represents to Lessee that as of the date
                  of this Lease, there are no mortgages or ground leases
                  encumbering the Premises or any portion thereof.


                                      -30-

      20.0  NOTICE OF LEASE; ESTOPPEL CERTIFICATES. Lessor and Lessee agree that
            this Lease shall not be recorded. However, upon the request of
            either party, Lessor and Lessee shall execute and acknowledge a
            Notice of Lease in mutually acceptable and recordable form.

            From time to time during the Lease Term, and without charge, either
            party shall, within fifteen (15) business days of request by the
            other, certify by written instrument duly executed and acknowledged,
            to the requesting party or to any person reasonably specified by the
            requesting party, regarding (a) the existence of any amendments or
            supplements to this Lease; (b) the validity and force and effect of
            this Lease; (c) the existence of any known default or Event of
            Default; (d) the existence of any offsets, counterclaims or
            defenses; (e) the Commencement Date and the expiration date of the
            Lease Term; (f) the amount of Rent due and payable and the date to
            which Rent has been paid; and (g) such other matters as may be
            reasonably requested.

      21.0  HOLDING OVER. If Lessee occupies the Premises after the day on which
            the Lease Term expires (or the effective date of any earlier
            termination as herein provided) without having entered into a new
            lease thereof with Lessor, Lessee shall be a tenant-at-sufferance
            only, subject to all of the terms and provisions of this Lease;
            PROVIDED THAT Basic Rent shall be payable for the first sixty (60)
            days after such expiration or termination at one and one-half (1.5)
            times the then-effective Basic Rent stated in Section 3.2 and
            thereafter shall be payable at three (3) times the then-effective
            Basic Rent there stated. Such a holding over, even if with the
            consent of Lessor, shall not constitute an extension or renewal of
            this Lease. For purposes of this Section, the failure of Lessee to
            complete by the last day of the Lease Term or the effective date of
            any earlier termination as herein provided the "close-out"
            procedures required by the Nuclear Regulatory Commission or any
            other federal, state or local governmental agency having
            jurisdiction over the use of radioactive materials within the
            Premises shall constitute a holding over and subject Lessee to the
            provisions of this Section.

      22.0  FORCE MAJEURE. Neither Lessor nor Lessee shall be deemed to be in
            default hereunder and the time for performance of any of their
            respective obligations hereunder other than the payment of money
            shall be postponed for so long as the performance of such obligation
            is prevented by strike, lock-out, act of God, absence of materials
            or any other matter not reasonably within the control of the party
            which must perform the obligation (collectively, "Force Majeure").

      23.0  ENTIRE AGREEMENT. No oral statement or prior written matter shall
            have any force or effect. This Agreement shall not be


                                      -31-

            modified or canceled except by writing subscribed to by all parties.

      24.0  SUCCESSORS AND ASSIGNS. The terms, covenants and conditions of this
            Lease shall run with the Land, and be binding upon and inure to the
            benefit of Lessor and Lessee and their respective successors and
            permitted assigns.

      25.0  APPLICABLE LAW, SEVERABILITY AND CONSTRUCTION. This Lease shall be
            governed by and construed in accordance with the laws of
            Massachusetts and, if any provisions of this Lease shall to any
            extent be invalid, the remainder of this Lease, and the application
            of such provisions in other circumstances, shall not be affected
            thereby. The titles of the several Sections contained herein are for
            convenience only and shall not be considered in construing this
            Lease. Whenever the singular is used and when required by the
            context it shall include the plural, and the neuter gender shall
            include the masculine and feminine. The Exhibits attached to this
            Lease are incorporated into this Lease by reference. This Lease may
            be executed in several counterparts, each of which shall be an
            original, but all of which shall constitute one and the same
            instrument. The term "Lessor" whenever used herein, shall mean only
            the owner at the time of Lessor's interest herein, and no covenant
            or agreement of Lessor, express or implied, shall be binding upon
            any person except for defaults occurring during such person's period
            of ownership nor binding individually upon any fiduciary, any
            shareholder, officer or director, or any beneficiary under any
            trust, and the liability of Lessor, in any event, shall be limited
            to Lessor's interest in the Building. If Lessee is several persons
            or a partnership, Lessee's obligations are joint or partnership and
            also several. Unless repugnant to the context, "Lessor" and "Lessee"
            mean the person or persons, natural or corporate, named above as
            Lessor and as Lessee respectively, and their respective heirs,
            executors, administrators, successors and assigns.

      26.0  AUTHORITY. Contemporaneously with the signing of this Lease, Lessee
            shall furnish to Lessor a certified copy of the resolution of the
            Board of Directors of Lessee authorizing Lessee to enter into this
            Lease, and Lessor shall furnish appropriate evidence of the
            authority of Lessor to enter into this Lease.

      27.0  WORK TO BE PERFORMED BY POLAROID CORPORATION. Lessor will purchase
            the Land and the Building from Polaroid Corporation ("Polaroid")
            contemporaneously with the execution and delivery of this Agreement.
            Under the purchase and sale agreement between Lessor and Polaroid
            (the "Purchase Agreement"), a copy of which has been provided to the
            Lessee,


                                      -32-

            Polaroid has agreed to install a new steam line to serve the
            Building and to provide steam to the Building while the new line is
            being installed. Polaroid has also agreed: (i) to allow Lessor and
            Lessee to perform wipe tests in the clean room on the first floor of
            the Building, and (ii) at Polaroid's expense, to perform any cleanup
            needed to eliminate Hazardous Materials therein. Lessor agrees to
            use reasonable efforts to ensure that Polaroid fulfills such
            obligations.

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


            LESSOR:                     MASSACHUSETTS INSTITUTE OF
                                        TECHNOLOGY


            Date: February 8, 1996, 1996    By:/S/ Philip A. Trussell
                                               -----------------------------
                                               Philip A. Trussell
                                               Director of Real Estate
                                               Hereunto duly authorized


            LESSEE:                     ANALOG DEVICES, INC.


            Date: February 8, 1996, 1996    By:/S/ Joseph E. McDonough
                                               -----------------------------
                                               Name:  Joseph E. McDonough
                                               Title:  V.P. Finance and CFO
                                               Hereunto duly authorized


                                      -33-

                              EXHIBIT A - PREMISES

                                   DESCRIPTION


            The land with the buildings thereon in Cambridge, Massachusetts,
      bounded and described as follows:



                          
            Northerly:       by State Street;

            Easterly:        by Osborn Street;

            Southeasterly:   by Albany Street;

            Southwesterly:   by Massachusetts Avenue; and

            Westerly:        by Smart Street.


            Said premises contain 120,847 square feet of land more or less.

            Subject to a notice of variance granted to Blanchard Machine Company
      dated October 27, 1964, recorded with the Middlesex County South District
      Registry of Deeds at Book 10676, Page 366 and filed for registration with
      the Middlesex County South Registry District of the Land Court as Document
      No. 412081.

            For title see the following three deeds to the Seller: (1) deed of
      PneumoDynamics Corporation dated June 12, 1972, recorded with said Deeds
      at Book 12224, Page 402 and filed for registration with the Middlesex
      County South Registry District of the Land Court as Document No. 498460;
      (2) deed of Massachusetts Institute of Technology dated September 9, 1977
      and recorded with said Deeds at Book 13282, Page 401; and (3) deed of
      Edith Levine dated November 30, 1989 and recorded with said Deeds at Book
      20232, Page 320. See also Certificate of Title No. 137943.

                             EXHIBIT B - WORK LETTER

            This Work Letter is incorporated by reference into the Lease dated
      February 8, 1996 by and between Massachusetts Institute of Technology, as
      Lessor, and Analog Devices, Inc. as Lessee. Terms defined in or by
      reference in the Lease not otherwise defined herein shall have the same
      meaning herein as therein.

      1.    ADDITIONAL DEFINITIONS. Each of the following terms shall have the
            meaning stated immediately after it:

            CONSTRUCTION AUTHORIZATIONS. Collectively, all permits, licenses and
            other consents and approvals required from any governmental
            authority for the construction of Lessee's Work.

            LESSEE'S GENERAL CONTRACTOR. A general contractor selected by Lessee
            and approved in writing by Lessor, who will be engaged by Lessee to
            construct Lessee's Work.

            LESSEE'S WORK. All improvements, alterations and additions which
            Lessee wishes to make to the Premises as part of the initial
            preparation thereof for Lessee's occupancy. All Lessee's Work shall
            be performed in a good and workmanlike manner consistent with
            existing conditions within the Building and shall be of a quality
            equal to or better than existing conditions.

            WORKING DRAWINGS. The working drawings and specifications for
            Lessee's Work, to be prepared by Lessee and Lessee's architect in
            accordance with this Work Letter. The Working Drawings shall be
            prepared in compliance with all applicable Legal Requirements and
            stamped by registered Massachusetts professionals, and shall consist
            of all architectural and engineering plans and specifications which
            are required to finish the Premises or to obtain any Construction
            Authorization required therefor.

      2.    PREPARATION OF THE PREMISES. Lessee shall perform Lessee's Work at
            Lessee's sole cost and expense.

      3.    INSURANCE. Prior to the commencement of any design work on Lessee's
            Work, Lessee shall provide to Lessor an original certificate of
            insurance, in customary form, for each architect and engineer
            retained by Lessee in connection with the design and/or construction
            of Lessee's Work, which certificate shall evidence a current "errors
            and omissions" insurance policy as in effect, in an amount
            reasonably acceptable to Lessor. Prior to the commencement of the
            construction of Lessee's Work, Lessee shall provide to Lessor an
            original certificate of insurance for the general


                                       -1-

            construction of Lessee's Work, which certificate shall evidence a
            current general liability insurance policy as in effect, in an
            amount reasonably acceptable to Lessor, naming Lessor as an
            additional insured.

      4.    WORKING DRAWINGS. Lessee shall be solely responsible for the
            preparation and completion of all preliminary and final Working
            Drawings. Lessee shall retain its own architects and engineers to
            prepare Working Drawings, PROVIDED THAT Lessor first approves such
            engineers and architects so selected by Lessee, which approval shall
            not be unreasonably withheld or delayed. Lessee shall provide copies
            of the preliminary Working Drawings to Lessor, and Lessor shall
            provide to Lessee within one (i) business day thereafter a list of
            corrections and modifications which Lessor requires to be made to
            the Working Drawings.

            Lessee shall revise the preliminary Working Drawings to incorporate
            the corrections and modifications requested by Lessor and shall
            submit final Working Drawings to Lessor for its approval. Lessor
            shall review the final Working Drawings and, within one (1) business
            day after receipt thereof, Lessor shall either (a) notify Lessee
            that Lessor has approved the final Working Drawings, or (b) provide
            to Lessee a list of corrections and modifications which Lessor
            requires to be made to the Working Drawings. In the event Lessor
            returns the Working Drawings to Lessee for correction or
            modification, Lessee shall diligently correct the Working Drawings
            and re-submit them to Lessor for approval pursuant to the preceding
            provisions of this paragraph. No work shall be performed until final
            Working Drawings have been approved in writing by Lessor.

            The review and/or approval by Lessor or its architect or engineers
            of any plans, sketches or Working Drawings submitted by Lessee
            relating to Lessee's Improvements shall not (i) constitute an
            opinion or representation by Lessor that the same are in compliance
            with all applicable Legal Requirements and the provisions of all
            applicable insurance policies or as to the feasibility of
            constructing the work shown thereon, or (ii) impose on Lessor any
            responsibility for a design defect, it being agreed that all such
            responsibility shall remain solely with Lessee.

            Lessee shall reimburse Lessor, promptly upon demand therefor, for
            all costs and expenses reasonably incurred by Lessor in reviewing
            any plans, drawings and specifications submitted by Lessee pursuant
            to this Work Letter, which reimbursement shall be due and payable as
            Additional Rent.


                                       -2-

      5.    LESSEE'S GENERAL CONTRACTOR. Lessee shall obtain the prior
            reasonable written approval of Lessor as to Lessee's General
            Contractor.

      6.    LESSEE'S WORK. Lessee shall be solely responsible for obtaining all
            Construction Authorizations required for Lessee's Work. Lessee shall
            apply for and maintain in full force and effect (or cause Lessee's
            General Contractor to apply for and so maintain) all Construction
            Authorizations required for the construction of Lessee's Work, and
            upon completion of Lessee's Work shall obtain a certificate from the
            appropriate governmental authority that Lessee's Work has been
            completed in accordance with Legal Requirements. Lessee shall
            deliver to Lessor a copy of said certificate promptly after
            receiving the same.

            Promptly after receiving all Construction Authorizations required
            for Lessee's Work, Lessee shall cause Lessee's General Contractor to
            commence construction and diligently to proceed to completion
            thereof. All construction shall be performed in a good and
            workmanlike manner, using new materials and in compliance with the
            Working Drawings, the Construction Authorizations, all Legal
            Requirements, and the provisions of all applicable insurance
            policies.

            Lessee shall pay promptly for all labor and materials supplied to
            Lessee in connection with Lessee's Work, shall not cause or permit
            any liens for such labor or materials to attach to the Premises, and
            shall bond or discharge any such lien which may be filed or recorded
            within fifteen (15) days after Lessee receives actual notice of such
            filing or recording.

            The construction of Lessee's Work shall be subject to the
            requirements set forth in Section 11.0(f) of the Lease. Lessor may
            inspect such work at any time or times and shall promptly give
            notice to Lessee of any observed defects. Lessee shall indemnify,
            defend and hold harmless Lessor from and against any and all
            liability, damage, penalties or judgments and from and against any
            claims, actions, proceedings and expenses and costs in connection
            therewith, including reasonable attorneys' fees, arising out of or
            resulting from the design or construction of Lessee's Work.

            Lessee shall obtain from Lessee's General Contractor a guaranty
            against construction defects for a period of not less than one (1)
            year.

      7.    DELAYS. No delay by Lessee, Lessee's architects or engineers,
            Lessee's General Contractor, or any subcontractor or supplier
            thereof shall affect the Rent Commencement Date.


                                       -3-

      8.    LESSOR'S AND LESSEE'S REPRESENTATIVES. Prior to the commencement of
            any design work for the Premises, each party hereto shall designate
            in writing to the other a person as "Lessor's Representative" and
            "Lessee's Representative" respectively, which person shall be
            available during ordinary business hours to review the progress of
            the work and to respond to issues which arise during construction.
            Each party may rely on the other's Representative with respect to
            all matters which pertain to this Work Letter, each party having
            authorized its Representative to make decisions binding upon such
            party with respect to such matters.

      9.    GENERAL. A breach by Lessee of any provision of this Work Letter
            shall constitute a default under the Lease, for which Lessor shall
            have all remedies therein provided.