MGI PROPERTIES
8-K/A, 1999-09-03
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                   Form 8-K/A

                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the

                         Securities Exchange Act of 1934


Date of Report (Date of earliest event reported): June 22, 1999
                                                  -------------


                                 MGI PROPERTIES
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


    Massachusetts                 1-6833                   04-6268740
- --------------------------------------------------------------------------------
(State or other jurisdiction   (Commission              (IRS Employer
     of incorporation)         File Number)           Identification No.)


                One Winthrop Square, Boston, Massachusetts 02110
- --------------------------------------------------------------------------------
          (Address of Principal Executive Offices)


Registrant's telephone number, including area code: (617) 422-6000
                                                    --------------


<PAGE>

Item 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION
          AND EXHIBITS.

         (b)   Pro Forma Financial Information
               -------------------------------

           Pro Forma Financial Statements.*

         (c)   Exhibits
               --------

         Exhibit No.                                 Exhibit
         ----------                                  -------

           2.1             Purchase and Sale Agreement dated March 12,
                           1999, by and among the Trust, for itself and
                           as agent for each of the entities listed
                           therein, and BCIA Funding Corp.

           2.2             Amendment to Purchase and Sale Agreement dated March
                           28, 1999.

           2.3             Second Amendment to Purchase and Sale
                           Agreement dated May 5, 1999.

           99.1            Press Release dated July 1, 1999.*

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

* Previously filed.




                                       -2-

<PAGE>

                                   SIGNATURES
                                   ----------

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                         MGI PROPERTIES
                                         (Registrant)



Dated: September 2, 1999                By: /s/ Phillip C. Vitali
                                            ------------------------------------
                                            Name:   Phillip C. Vitali
                                            Title:  Executive Vice President
                                                       and Treasurer
                                                    (Chief Financial Officer)



                                       -3-

<PAGE>
                                  EXHIBIT INDEX

2.1               Purchase and Sale Agreement dated March 12, 1999, by and among
                  the Trust,  for  itself and as agent for each of the  entities
                  listed therein, and BCIA Funding Corp.

2.2               Amendment to Purchase and Sale Agreement dated March
                  28, 1999.

2.3               Second Amendment to Purchase and Sale Agreement dated
                  May 5, 1999.

99.1              Press Release dated July 1, 1999.*

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

* Previously filed.



                                                           New England Portfolio



                           PURCHASE AND SALE AGREEMENT


                                 by and between

                       MGI Properties and other entities,

                                     Seller

                                       and

                               BCIA Funding Corp.,

                                    Purchaser


<PAGE>
                                                           New England Portfolio



                                TABLE OF CONTENTS


ARTICLE 1.    THE PROPERTIES................................................3
        1.1   Properties....................................................3
        1.2   Assumed Debt..................................................4
        1.3   Prepayment of Existing Debt...................................5
        1.4   Tenant Rights.................................................6

ARTICLE 2.    THE PURCHASE PRICE; DEPOSIT...................................6
        2.1   Purchase Price................................................6
        2.2   Escrow........................................................7
        2.3   Deposit.......................................................7
        2.4   Allocation of Purchase Price..................................7

ARTICLE 3.    THE CLOSING...................................................8
        3.1   Closing Date..................................................8

ARTICLE 4.    CLOSING CONDITIONS............................................8
        4.1   Precondition to Purchaser's Obligations.......................8
        4.2   Inspection Period; Due Diligence Materials and Termination....9
        4.3   Title and Survey.............................................10
        4.4   Precondition to Sellers'Obligations..........................11
        4.5   Risk of Casualty Loss; Eminent Domain........................12

ARTICLE 5.    ACTIONS PRIOR TO THE CLOSING.................................14
        5.1   Access to Properties; Inspection Period......................14
        5.2   Continuation of Operations...................................14
        5.3   New Leases...................................................14
        5.4   Service Contracts............................................15
        5.5   Construction Contracts.......................................15
        5.6   Insurance....................................................15
        5.7   MGI Lease....................................................15

ARTICLE 6.    CLOSING OBLIGATIONS..........................................16
        6.1   Sellers'Deliverables.........................................16
        6.2   Purchaser's Deliverables.....................................17

ARTICLE 7.    MATTERS TO WHICH THE SALE IS SUBJECT.........................18
        7.1   Condition of Title...........................................18
        7.2   Application of Purchase Price to Liens.......................19

                                      (i)

<PAGE>

ARTICLE 8.    REPRESENTATIONS AND WARRANTIES...............................19
        8.1   Purchaser's Knowledge........................................19
        8.2   Seller's Representations.....................................20
        8.3   Knowledge....................................................22
        8.4   Survival.....................................................22
        8.5   Purchaser's Representations..................................23
        8.6   Complete Agreement...........................................24

ARTICLE 9.    ENVIRONMENTAL MATTERS........................................24
        9.1   Hazardous Substances.........................................24
        9.2   Survival.....................................................25

ARTICLE 10.   CLOSING ADJUSTMENTS AND OBLIGATIONS..........................25
        10.1  Prorations...................................................25
        10.2  Reconciliations..............................................29
        10.3  Survival.....................................................29

ARTICLE 11.   EXTENSION; TERMINATION.......................................29
        11.1  Extension to Satisfy Conditions..............................29
        11.2  Failure to Satisfy Closing Conditions........................30
        11.3  Return of Materials..........................................30

ARTICLE 12.   DEFAULTS.....................................................31
        12.1  Purchaser's Default..........................................31
        12.2  Sellers'Default..............................................32

ARTICLE 13.   BROKERS......................................................32
        13.1  No Brokers...................................................32

ARTICLE 14.   NOTICES......................................................32
        14.1  Notices......................................................32

ARTICLE 15.   MISCELLANEOUS................................................34
        15.1  Amendments...................................................34
        15.2  Governing Law; Waiver of Trial By Jury.......................34
        15.3  Limitations on Assignability.................................34
        15.4  Waivers......................................................34
        15.5  Exhibits.....................................................34
        15.6  Section Headings.............................................35
        15.7  Recording and Binding Effect.................................35
        15.8  Counterparts.................................................35

                                      (ii)

<PAGE>

        15.9  Relationship of Parties......................................35
        15.10 Business Day.................................................35
        15.11 Time of the Essence..........................................35
        15.12..............................................................36
        15.13 Survival.....................................................36
        15.14 Limitation of Liability......................................36

SCHEDULE 1
       Identity of Sellers.................................................39

EXHIBIT A-1 through A-53
       Legal Description of the Properties.................................40

EXHIBIT B
        Schedule of Existing Debt..........................................41

EXHIBIT C
        List of Purchase Rights............................................42

EXHIBIT D
        Form of Tenant Estoppel............................................43

EXHIBIT E
        List of Leases, Security Deposits and Letters of Credit............44

EXHIBIT F
        Document Room Inventory List.......................................45

EXHIBIT G
        Right of Entry Agreement...........................................46

EXHIBIT H
        Schedule of Service Contracts......................................47

EXHIBIT I
        Form of Bill of Sale...............................................48

EXHIBIT J
        Form of Assignment and Assumption of Leases........................49

EXHIBIT K
        List of Existing Litigation........................................50

                                     (iii)

<PAGE>

EXHIBIT L
        Schedule of New Leasing Cost Allocations...........................51

EXHIBIT M
        Form of Assignment of Contracts....................................52

EXHIBIT N
        List of Personal Property..........................................53

EXHIBIT O
        Schedule of Purchase Price Allocations.............................54

EXHIBIT P
        List of Brokerage Agreements.......................................55

EXHIBIT Q
        List of Eminent Domain Matters.....................................56

EXHIBIT R
        Schedule of Construction Contracts.................................57

EXHIBIT S
        Escrow Agreement...................................................58

EXHIBIT T
        Outstanding MGI Construction Obligations to Tenants................59


                                      (iv)

<PAGE>
                                                           New England Portfolio

                           PURCHASE AND SALE AGREEMENT

            THIS  AGREEMENT is made as of this 12th day of March,  1999,  by and
among MGI  Properties,  a trust  organized  and  existing  under the laws of the
Commonwealth of Massachusetts  ("MGI"),  for itself and as agent for each of the
entities more particularly described on Schedule 1 attached hereto (MGI and each
such entity are  collectively,  the "Sellers") each having an address at c/o MGI
Properties,  One Winthrop Square,  Boston,  Massachusetts 02110 and BCIA Funding
Corp.,  a  Massachusetts  corporation,  having an  address  c/o  Boston  Capital
Institutional   Advisors,   L.L.C.,   One  Boston  Place,  Suite  2100,  Boston,
Massachusetts 02108 (the "Purchaser"). References herein to "Seller" shall, when
used in the context of representations and warranties,  covenants and conveyance
obligations,  mean  MGI and  that  particular  entity  which  owns a  particular
Property, jointly and severally.

                              PRELIMINARY STATEMENT

            I.  Sellers own certain  improved  property  listed  below,  as more
particularly described in Exhibits A-1 through A-53 hereto:

URBAN OFFICE PORTFOLIO                               (Exhibits A-1 through A-6)
- ----------------------

One Winthrop Square,  Boston, MA
Ten Winthrop Square,  Boston, MA
One Portland Square,  Portland, ME
Two Portland Square, Portland, ME
Portland Square Parking, Portland, ME
1155 Elm Street, Manchester, NH

SUBURBAN OFFICE PORTFOLIO           (Exhibits A-7 through A-19)
- -------------------------

195 Scott Swamp Road, Farmington, CT
45 Glastonbury Boulevard, Glastonbury, CT
115 Glastonbury Boulevard, Glastonbury, CT
15 Crosby Drive,  Bedford,  MA
One Executive Drive, Chelmsford, MA
Point West Place, Framingham, MA
4 Centennial Drive, Peabody, MA
400 Southborough Drive, South Portland, ME
500 Southborough Drive, South Portland, ME
600 Southborough Drive, South Portland, ME
6 Trafalgar Square  Nashua, NH
15 Trafalgar Square, Nashua, NH
410 Amherst Street, Nashua, NH

<PAGE>
                                                           New England Portfolio

FLEX PORTFOLIO                      (Exhibits A-20 through A-33)
- --------------

200 Bullfinch Drive, Andover, MA
8 Forge Park, Franklin, MA
9 Forge Park, Franklin, MA
15 Forge Park, Franklin, MA
261 Cedar Hill Street, Marlborough, MA
753 Forest  Street, Marlborough, MA
100 Griffin Brook Drive, Methuen, MA
300 Griffin Brook Drive, Methuen, MA
234 Ballardvale Street, Wilmington, MA
326 Ballardvale Street, Wilmington, MA
400 Research Drive, Wilmington, MA
5 Wentworth  Drive, Hudson, NH
472 Amherst Street, Nashua, NH
22 Cotton Road, Nashua, NH


BOSTON AREA PARKS PORTFOLIO         (Exhibits A-34 through A-42)
- ---------------------------

One Andover Tech Center, Andover, MA
Two Andover Tech Center, Andover, MA
Four Andover Tech Center, Andover, MA
12 Parkwood Drive, Hopkinton, MA
35 Parkwood Drive, Hopkinton, MA
68 Elm Street, Hopkinton, MA
78 Elm Street, Hopkinton, MA
175 Paramount Drive, Raynham, MA
375 Paramount Drive, Raynham, MA



                                       2



<PAGE>
                                                           New England Portfolio

OFFICE/R&D PORTFOLIO                (Exhibits A-43 through A-53)
- --------------------

One Riverside Drive, Andover, MA
55 Middlesex Turnpike, Bedford, MA
805 Middlesex Turnpike, Billerica, MA
One Federal Street, Billerica, MA
Two Federal Street, Billerica, MA
Five Federal Street, Billerica, MA
321 Billerica Road, Chelmsford, MA
25 Porter Road, Littleton, MA
One Park West, Tewksbury, MA
1925 Andover Street, Tewksbury, MA ("1925 Andover")
Two Robbins Road, Westford, MA


            II. As of the date of this Agreement,  certain of the Properties are
encumbered by certain  mortgage debt which may be assumed by Purchaser  pursuant
to the terms of this Agreement.

            III. Sellers desire to sell to Purchaser,  and Purchaser  desires to
purchase from Sellers,  the Properties  (defined  below) upon and subject to the
terms and conditions set forth in this Agreement.


                           ARTICLE I. THE PROPERTIES
                                      --------------

     1.1 Properties.  For good and valuable consideration,  Sellers hereby agree
to sell to Purchaser,  and Purchaser hereby agrees to purchase from Sellers,  at
the price and upon the terms and conditions set forth in this Agreement:

         (a) All  Sellers'  right,  title and  interest  in and to the land more
particularly  described in Exhibits A-1 through A-53 hereto,  together  with all
rights and easements appurtenant thereto (the "Land");

         (b) All Sellers' right,  title and interest in and to the buildings and
other permanent improvements situated on the Land (the "Buildings"); and

                                       3
<PAGE>

         (c) All Sellers'  right,  title and interest in and to all tangible and
intangible  personal  property  of  every  kind  and  nature  now  or  hereafter
installed,  located,  attached or used in  connection  with the operation of the
Land and  Buildings,  including,  without  limitation,  the  items  of  tangible
personal  property  described  on  Exhibit  N  attached  hereto  (the  "Personal
Property");  provided, however, that in no event shall Personal Property include
any of the  furniture,  equipment,  artwork or other  personal  property  of MGI
located at the Property known as One Winthrop Square, Boston, Massachusetts.

The Land, the Buildings and the Personal  Property are hereinafter  collectively
referred to as the "Properties".

          1.2 Assumed Debt.

          (a) Certain of the  Properties  are  subject to  mortgage  liens which
secure existing indebtedness of Sellers more particularly described in Exhibit B
hereto ("Existing Debt").  Each holder of the Existing Debt shall hereinafter be
referred to as a "Lender" and  collectively,  as the  "Lenders."  Subject to the
provisions of subsection (c) below, it is a condition of Purchaser's obligations
hereunder  that all of the Existing Debt with the exception of the Existing Debt
secured by the  Property  located at 1925  Andover  Street,  Tewksbury,  Ma (the
Property  located at 1925  Andover  Street  shall be referred to as the "Andover
Street  Property" and the Existing  Debt which is secured by the Andover  Street
Property  shall be referred to as the "Andover  Street Debt") will be prepaid at
the time of Closing (as defined in Section 3.1) and that  Purchaser will acquire
the  Properties  subject to the Andover  Street Debt and any liens securing such
debt,  but free and clear of all other Existing Debt and the liens securing such
other Existing Debt.

          (b) During the Inspection  Period, the parties shall cooperate in good
faith and with reasonable  diligence to obtain the approval of the holder of the
Andover Street Debt (the "Andover  Lender") to (i) the conveyance of the Andover
Street  Property to  Purchaser  subject to the Andover  Street Debt and (ii) the
assumption  of the Andover  Street  Debt by  Purchaser  on terms and  conditions
substantially  the same as those set forth in the documents  which  evidence and
secure the Andover Street Debt (the "Required Consent").  Purchaser acknowledges
that the  initial  communications  with the Andover  Lender or any other  Lender
shall be through Sellers and Purchaser shall not initially  directly  contact or
communicate  with any Lender  without  the prior  written  consent  of  Sellers.
Purchaser  shall  promptly  provide  Sellers  and the  Andover  Lender  with all
information  reasonably  requested by the Andover  Lender in order to facilitate
obtaining the Required Consent and shall comply with all commercially reasonable
conditions  precedent to the effectiveness of the Required  Consent,  including,
without  limitation,  assuming any obligations of Sellers which are non-recourse
carve-outs identical in all material respects to those obligations guaranteed by
Sellers  (e.g.  environmental  indemnities,  losses  due to fraud or  willful or
wanton acts or misconduct) and satisfying any commercially  reasonable financial
or net  worth  requirements



                                       4
<PAGE>
                                                           New England Portfolio

of the  Andover  Lender  required  to  secure  such  obligations  In any  event,
Purchaser shall not be obligated to acquire the Andover Street Property  subject
to the  Andover  Street  Debt unless the terms and  conditions  of the  Required
Consent  are  commercially  reasonable.  In no event shall any  condition  which
requires  Purchaser to undertake  any  recourse  obligation  which is greater in
scope from the recourse obligations  originally  undertaken by the Seller or MGI
under the Andover  Street Debt (and the loan  documents  evidencing and securing
such  debt)  or  which   increases  the  interest  rate,  the  regular   monthly
installments  of debt  service,  the  scope of the  escrow  requirements  or the
prepayment  premium or decreases the term or the period in which the loan may be
prepaid or  otherwise  changes in any  materially  adverse  respect  the default
provisions  or the  borrower's  obligations  under the  documents  evidencing or
securing the Andover  Street Debt be deemed  commercially  reasonable.  Provided
that the Required Consent is obtained, Purchaser shall assume the Andover Street
Debt which shall hereafter be referred to as "Assumed Debt" and Seller shall pay
at Closing any assumption fees which may be due and all other charges imposed by
the Andover Lender in connection with the granting of the Required Consent.

          (c) Notwithstanding  anything herein to the contrary,  if the Required
Consent is not obtained by the Closing  Date,  the parties shall close on all of
the  Properties  other than the Andover Street  Property,  subject to all of the
other terms and  conditions of this  Agreement,  except that the Purchase  Price
shall be reduced by the Allocable  Purchase Price (as defined in Section 2.4) of
the  Andover  Street  Property  as set forth in  Exhibit O and a portion  of the
Deposit equal to 3.65% of the  Allocable  Purchase  Price of the Andover  Street
Property  shall be retained by Escrow Agent to bind  Purchaser's  obligations to
purchase  the  Andover  Street   Property  as  hereinafter  set  forth  in  this
subsection.  If within the sixty  (60) day period  following  the  Closing,  the
Required Consent is obtained, Sellers shall sell and Purchaser shall acquire the
Andover  Street  Property for a purchase  price equal to the Allocable  Purchase
Price of the Andover  Street  Property and otherwise on the terms and conditions
set forth in this  Agreement.  The closing of the Andover Street  Property shall
occur ten (10) days after the Required Consent is obtained. If within such sixty
(60) day period, the Required Consent is not obtained,  then that portion of the
Deposit  allocable to the Andover Street Property shall be returned to Purchaser
and all  obligations  of the parties  hereto with respect to the Andover  Street
Property  shall cease and this  Agreement  with  respect to the  Andover  Street
Property  shall  be void and  without  recourse  to the  parties  (except  those
provisions which are expressly intended to survive such termination).

          1.3. Prepayment of Existing Debt. In connection with the Existing Debt
to be prepaid at the time of Closing,  the Purchaser shall reimburse Sellers for
all  prepayment  premiums  or  prepayment  penalties  incurred by the Sellers in
connection  with the  prepayment  of all of the  Existing  Debt  other  than the
Assumed Debt (collectively,  the "Prepayment Charges") consistent with the terms
of the prepayment  obligations set forth in the promissory notes evidencing such
Existing  Debt,  copies of which are attached  hereto as Exhibit B-1 - B-6. Such
reimbursement shall be in the form of an adjustment at the Closing.


                                       5
<PAGE>
                                                           New England Portfolio

The Sellers shall use diligent efforts to obtain from the applicable Lenders the
amount of the  Prepayment  Charges  prior to the  expiration  of the  Inspection
Period.

     1.4 Tenant  Rights.  Attached  hereto as Exhibit C is a list of tenants who
have rights to acquire a Property or  Properties  pursuant to their rights under
Leases or otherwise (collectively,  the "Purchase Rights"). Sellers either have,
prior to the date of this Agreement,  offered or shall,  following the execution
of this  Agreement,  offer  each such  tenant the right to buy the  Property  or
Properties  covered by the Purchase Right so as to enable Sellers to convey such
Property or Properties to Purchaser  free and clear of the Purchase  Right.  The
form of any such offer made to such  tenant or tenants  after the  execution  of
this Agreement shall be subject to the prior written consent of Purchaser,  such
consent not to be  unreasonably  withheld or delayed.  Notwithstanding  anything
herein to the contrary, if any tenant duly exercises its Purchase Right, Sellers
shall notify  Purchaser of such fact within two (2) Business  Days after receipt
of notice and thereupon the Property or Properties which are the subject of such
Purchase Right shall be eliminated from the transaction  contemplated  hereunder
and the  Purchase  Price  shall be reduced by an amount  equal to the  Allocable
Purchase  Price  (defined  below) for the Property or Properties so  eliminated.
With respect to any Property or  Properties  subject to a Purchase  Right not so
eliminated,  each party agrees to waive any rights or claims it may have against
the other on  account  of (i) any claim  brought  by a tenant  with  respect  to
Purchase Rights and/or (ii) Seller's  inability,  for any reason, to convey such
Property or Properties as a result of such a claim by a tenant.

                     ARTICLE 2. THE PURCHASE PRICE; DEPOSIT
                                ---------------------------

     2.1 Purchase Price. The purchase price (the "Purchase Price") shall be paid
by  Purchaser  to Sellers for the  Properties  in the amount of Four Hundred Ten
Million Dollars ($410,000,000), payable as follows:

          (a) Ten Million Dollars  ($10,000,000)  (the "Initial  Deposit") to be
     paid on the  date of  this  Agreement  by a wire  transfer  of  immediately
     available federal funds to Fidelity National Title Insurance Company of New
     York, 133 Federal Street,  Boston, MA 02110 c/o Kevin T. Creedon, Esq, Vice
     President as Escrow Agent (the "Escrow Agent");

          (b) Five Million Dollars  ($5,000,000) (the "Additional  Deposit" and,
     together with the Initial  Deposit,  the "Deposit") to be paid prior to the
     expiration  of the  Inspection  Period  unless  this  Agreement  is  sooner
     terminated  in  accordance  with  the  terms of this  Agreement,  by a wire
     transfer of immediately available federal funds to Escrow Agent;

                                       6


<PAGE>
                                                           New England Portfolio

          (c) Approximately  Seven Million Eight Hundred  Twenty-Seven  Thousand
     Seven Hundred  Fifty-Nine  Dollars  ($7,827,759)  by the  assumption of the
     Assumed Debt; and

          (d) The  balance of the  Purchase  Price,  subject to  adjustments  as
     herein provided,  by a wire transfer of immediately available federal funds
     to Seller at the Closing.

     2.2 Escrow.  Escrow Agent shall accept and hold the Deposit  (including any
standby letters of credit)  pursuant to the terms of a certain Escrow  Agreement
in the form attached hereto as Exhibit S (the "Escrow  Agreement") dated of even
date  herewith  to be  executed  contemporaneously  with the  execution  of this
Agreement by and among Sellers, Purchaser and Escrow Agent.

     2.3 Deposit. Subject to all terms, covenants,  conditions and provisions of
the Escrow Agreement,  and notwithstanding anything to the contrary contained in
this Agreement:

          (a) If any provision of this Agreement  requires  Sellers to refund to
     Purchaser the Deposit or other sums previously paid by Purchaser on account
     of the Purchase  Price,  the Deposit  shall be paid to Purchaser  not later
     than five (5) Business Days (as  hereinafter  defined) after Escrow Agent's
     receipt of Purchaser's written demand therefor; and

          (b) If any provision of this Agreement  entitles Sellers to retain the
     Deposit  or any  amount  previously  paid by  Purchaser  on  account of the
     Purchase Price, the Deposit shall be payable to Sellers not later than five
     (5) Business Days after Escrow Agent's  receipt of Sellers'  written demand
     therefor.

          (c) In any event,  Purchaser  shall be entitled to all interest earned
     on the Deposit  which shall be payable by the Escrow Agent to the Purchaser
     on a periodic basis during the term of this Agreement.

     2.4.  Allocation of Purchase Price. The parties agree that for all purposes
of this  Agreement,  the  Purchase  Price  shall be deemed  allocated  among the
Properties in accordance  with the schedule  attached  hereto as Exhibit O. That
portion of the Purchase Price allocated to each Property or Properties  shall be
deemed the  "Allocable  Purchase  Price" for such  Property or  Properties.  The
parties agree that on the date of execution of this  Agreement,  Exhibit O shall
consist of the Allocable Purchase Prices for the Properties which are subject to
Purchase  Rights.  To the extent  required for state transfer tax purposes or as
otherwise agreed by the parties,  the Purchaser shall propose Allocable Purchase
Prices for each of the other Properties, subject to the consent of Sellers.

                                       7
<PAGE>
                                                           New England Portfolio

                             ARTICLE 3. THE CLOSING
                                        -----------

     3.1 Closing Date.  The delivery of the Deeds (as  hereinafter  defined) and
the payment of the balance of the Purchase Price by Purchaser to Sellers and the
compliance  with the  other  closing  obligations  set  forth in  Article 6 (the
"Closing") shall be held in the offices of Sellers' attorneys,  Goodwin, Procter
& Hoar LLP, Exchange Place, Boston, Massachusetts 02109 at 10:00 a.m. on June 1,
1999 (such date as it may be extended pursuant to the express terms hereof,  the
"Closing Date") or such other place or earlier time as may be mutually agreeable
to the parties,  time being of the essence on the part of the parties to perform
their obligations on said Closing Date.

                         ARTICLE 4. CLOSING CONDITIONS
                                    ------------------

     4.1.  Precondition  to  Purchaser's  Obligations.  Purchaser  shall  not be
obligated to purchase the  Properties  and pay the Purchase  Price unless on the
Closing Date each of the following conditions has been satisfied in all material
respects or waived by Purchaser.  Subject to the rights of the parties set forth
in Article 12, provided that all of the conditions  listed below in this Article
4 for the benefit of Purchaser are satisfied as of the Closing Date, the Deposit
shall be non-refundable to Purchaser  following the conclusion of the Inspection
Period.

          (a) Representations and Warranties. The representations and warranties
     made by Seller in this Agreement  shall be true and correct in all material
     respects  on  the  Closing  Date  with  the  same  effect  as  though  such
     representations and warranties had been made or given as of such date.

          (b)  Performance  of  Obligations.  Seller  shall have  performed  and
     complied in all material  respects with all of its  obligations  under this
     Agreement  which are to be performed or complied with by Seller prior to or
     at the Closing.

          (c) Condition of Properties.  Subject to the provisions of Section 4.5
     hereof,  the Properties shall be in substantially the same condition on the
     Closing  Date as on the date of this  Agreement,  reasonable  wear and tear
     excepted.

          (d)  Estoppel  Certificates.  Purchaser  shall  have  received  by the
     Closing Date estoppel  certificates  reasonably  satisfactory  to Purchaser
     substantially  in the form  attached as Exhibit D and dated no earlier than
     April 1, 1999 from (i) any tenant of a  Property  who has leased all of the
     rentable square footage of the Building thereon and (ii) tenants generating
     in the  aggregate at least  eighty  percent  (80%) of the rental  income of
     multi-tenanted  Buildings  of each of the  Properties  under the  leases as
     listed on  Exhibit E (all of the leases  referred  to on Exhibit E shall be
     the


                                       8
<PAGE>
                                                           New England Portfolio

     "Leases").  Notwithstanding  the above, with respect to any  multi-tenanted
     Building,  if Landlord  has  received  estoppel  certificates  from tenants
     generating in the aggregate at least sixty-five percent (65%) of the rental
     income of such  Building,  Seller,  at its  option,  may satisfy the eighty
     percent  (80%)  requirement  set forth in (ii) above for such  Building  by
     delivering one or more estoppel  certificate  from Seller as to the matters
     set forth in Exhibit D with respect to one or more of the remaining  Leases
     of such  Building as are  necessary to satisfy such  requirement;  provided
     that Sellers certifications to Purchaser in such estoppel certificate shall
     be deemed warranties and  representations  of Sellers hereunder which shall
     survive only until the  expiration  of the  Survival  Period (as defined in
     Section 8.4) and shall be subject to the  limitation on the maximum  amount
     of liability  set forth in Section 8.4.  Any  estoppel  certificate  from a
     tenant delivered to Purchaser at least three (3) Business Days prior to the
     end of the  Inspection  Period shall be deemed  acceptable to Purchaser for
     purposes of this  condition if Purchaser  fails to terminate this Agreement
     in  accordance  with  the  terms  of  Section  4.2.  After  the  end of the
     Inspection  Period,  Purchaser  shall have the right,  at its sole cost and
     expense,  to (i) request  updated  estoppel  certificates  from tenants who
     delivered  an  estoppel  certificate  prior  to the  end of the  Inspection
     Period, (ii) contact tenants who failed to deliver an estoppel  certificate
     prior to the end of the  Inspection  Period for the  purpose  of  obtaining
     estoppel  certificates from such tenants, and (iii) request  subordination,
     non-disturbance and attornment agreements from tenants. Notwithstanding the
     foregoing, neither receipt of any such requested updates nor receipt of any
     subordination, non-disturbance and attornment agreements shall constitute a
     closing condition.

          (e) Intentionally Deleted.

          (f) Title.  Purchaser  shall have received  title to the Properties as
     required by this Agreement.

     4.2. Inspection Period; Due Diligence Materials and Termination.

          (a) Inspection Period. Purchaser acknowledges that commencing prior to
     the execution of this Agreement and continuing  until 5:00 p.m. Boston time
     on April 28, 1999 (the "Inspection Period"),  Purchaser has conducted,  and
     shall continue to conduct, its reviews,  inspections, and investigations of
     the  Properties  and  all  information  relating  to the  physical,  legal,
     economic  and  environmental  condition  of  the  Properties.   During  the
     Inspection Period,  Purchaser shall review and inspect all of the materials
     referenced in the "Document Room Inventory List" attached hereto as Exhibit
     F located at the offices of MGI (the "Due Diligence  Materials")  and shall
     make such other reviews,  inspections and  investigations of the Properties
     and  all  information  relating  to  the  physical,   legal,  economic  and
     environmental  condition of


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<PAGE>
                                                           New England Portfolio

     the Properties as the Purchaser may in its sole  discretion  elect to make.
     Purchaser's  obligations  hereunder  shall be  conditioned  upon  Purchaser
     having  approved  in its sole  and  absolute  discretion  by the end of the
     Inspection   Period  the   results  of  its   reviews,   inspections,   and
     investigations  of the  Properties  and  all  information  relating  to the
     physical,  legal,  economic and environmental  condition of the Properties.
     Upon reasonable  advance notice to Sellers and always affording Sellers the
     opportunity to accompany  Purchaser or Purchaser's  representative,  during
     the Inspection Period,  Purchaser shall have the right to interview tenants
     of the  Properties.  Purchaser  shall  evidence  approval  or waiver of the
     conditions  set forth in this  Section  by (i) a written  notice to Sellers
     delivered  prior  to the  expiration  of the  Inspection  Period  expressly
     stating that Purchaser has  unconditionally  waived the condition set forth
     in this Section 4.2(a) and (ii) the delivery prior to the expiration of the
     Inspection Period of the Additional Deposit.  Upon evidencing such approval
     or waiver,  this  provision  shall be deemed waived and of no further force
     and effect.

          (b)  Termination  of  Agreement.   If  the  conditions  set  forth  in
     subsection (a) above (items (i) and (ii)) for whatever reason have not been
     satisfied  by the  end of  the  Inspection  Period,  this  Agreement  shall
     terminate  whereupon  the Deposit  shall be refunded to  Purchaser  and all
     obligations of the parties  hereto shall cease and this Agreement  shall be
     void and without recourse to the parties (except those provisions which are
     expressly intended to survive such termination).

     4.3 Title and Survey.  Sellers have arranged with Fidelity  National  Title
Insurance  Company of New York (the "Title  Company')  for the issuance of title
commitments  by the Title  Company for the benefit of Purchaser  for each of the
Properties.  In any event,  Purchaser  shall obtain (i) a complete  updated ALTA
title  commitment with such  endorsements as Purchaser may elect for each of the
Properties dated no earlier than the date of this Agreement with respect to each
of the Properties (with copies of all instruments listed as exceptions to title)
from the Title  Company or one or more  nationally  recognized  title  insurance
companies (each a "Title  Commitment") and, at Purchaser's  option, (ii) an ALTA
"as-built" instrument survey of each Property (each a "Survey"). Purchaser shall
have  until  the  end of the  Inspection  Period  to  examine  all of the  Title
Commitments and Surveys.  If Purchaser objects to any matters disclosed or which
should have been disclosed in any Title Commitment or Survey, Purchaser shall by
the end of the  Inspection  Period  send one  written  notice  to  Sellers  (the
"Adverse Matters Notice")  specifying all objectionable title and survey matters
(any such objectionable title or survey matter, a "Title Objection").  All title
or survey  matters  existing  as of the date of this  Agreement  (whether or not
disclosed  in the Title  Commitments  or Surveys)  not objected to in writing by
Purchaser  in the Adverse  Matters  Notice to Sellers by the  conclusion  of the
Inspection Period shall be deemed to be "Permitted Encumbrances".  Sellers shall
be obligated to cure any Title Objection or Title  Objections  which  constitute
liens voluntarily  created by Sellers to secure the payment of money (other than
liens  evidencing  or  securing  the Assumed  Debt,



                                       10
<PAGE>
                                                           New England Portfolio

which liens shall be deemed  Permitted  Encumbrances.  With respect to all other
Title Objections,  subject to Sellers' rights set forth below, Sellers shall use
reasonable  efforts to cure such other  Title  Objections;  provided  that in no
event shall  Sellers be  obligated  to expend more than Fifty  Thousand  Dollars
($50,000) in the aggregate to cure such other Title  Objections  with respect to
any one Property or Five Hundred Thousand Dollars ($500,000) in the aggregate to
cure  such  other  Title  Objections  with  respect  to all  of the  Properties.
Notwithstanding  the  foregoing,  with  respect  to any Title  Objections  which
Sellers  are not  obligated  to cure as  provided  above and are not  reasonably
susceptible to cure by the payment of money or are not reasonably susceptible to
cure through the expenditure of money within the dollar limits  specified in the
immediately  preceding sentence,  Sellers may notify Purchaser in writing within
five (5) Business Days after the expiration of the Inspection Period (the "Title
Response") that Sellers do not intend to attempt to cure such Title  Objections.
In such event,  Seller  shall have no  obligation  to cure the Title  Objections
described in the Title Response and Purchaser shall have three (3) Business Days
after  receipt of a Title  Response to notify  Seller that  Purchaser  elects to
waive  such  Title  Objections.  If  Purchaser  duly  elects to waive such Title
Objections, such Title Objections shall be deemed Permitted Encumbrances. In the
event  Purchaser  fails to waive all  Title  Objections  described  in the Title
Response, this Agreement shall terminate whereupon the Deposit shall be refunded
to  Purchaser  and all  obligations  of the parties  hereto shall cease and this
Agreement  shall be void and  without  recourse  to the  parties  (except  those
provisions which are expressly intended to survive such  termination).  Title to
the Properties shall be delivered at Closing free and clear of all encumbrances,
including  without   limitation,   all  existing  mortgages  (other  than  liens
evidencing or securing the Assumed Debt,  which liens shall be deemed  Permitted
Encumbrances),  except the  Permitted  Encumbrances  and except as  provided  in
Section 7.1 hereof.  Purchaser's failure to deliver an Adverse Matters Notice to
Sellers on or before the  expiration  of the  Inspection  Period shall be deemed
conclusively as Purchaser's  confirmation of the absence of any Title Objections
respecting  the  Properties.  Sellers'  failure to deliver a Title Response with
respect to any Title  Objections  to Purchaser  within the time period set forth
above shall be deemed Sellers'  election to use reasonable  efforts to cure such
Title  Objections,  in each case  subject  to the dollar  limitations  set forth
herein and the terms of Article 11.

     4.4. Precondition to Sellers' Obligations. Sellers shall not be required to
sell the Properties  unless on the Closing Date all of the following  conditions
have been satisfied or waived in writing by Sellers.

          (a) Representations and Warranties. The representations and warranties
     by  Purchaser in this  Agreement  shall be true and correct in all material
     respects  on  the  Closing  Date  with  the  same  effect  as  though  such
     representations and warranties had been made or given as of such date;

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<PAGE>
                                                           New England Portfolio

         (b) Performance of Obligations.  Purchaser shall have paid the balance
     of the Purchase Price and shall have performed and complied in all material
     respects with all of its  obligations  under this Agreement which are to be
     performed or complied with by Purchaser prior to or at the Closing;

          (c) Intentionally Deleted.

          (d) Title  Insurance.  Sellers shall have obtained prior to the end of
     the Inspection  Period, at their expense, a title commitment from the Title
     Company  in  form  and  substance   reasonably   satisfactory   to  Sellers
     affirmatively  insuring Sellers against any claim brought on account of the
     Purchase  Rights  before or after the  Closing.  If this  condition  is not
     timely  satisfied,  this Agreement  shall  terminate  whereupon the Deposit
     shall be refunded to Purchaser and all  obligations  of the parties  hereto
     shall cease and this  Agreement  shall be void and without  recourse to the
     parties (except those  provisions  which are expressly  intended to survive
     such termination).

          (e) Approval of Purchaser's Diligence.  Purchaser shall have delivered
     both the notice to Seller waiving the conditions to Purchaser's obligations
     set forth in Section 4.2(a) and the Additional  Deposit in accordance  with
     the terms of this  Agreement.  If this  condition is not timely  satisfied,
     this Agreement shall  terminate  whereupon the Deposit shall be refunded to
     Purchaser and all  obligations  of the parties  hereto shall cease and this
     Agreement  shall be void and without  recourse to the parties (except those
     provisions which are expressly intended to survive such  termination).

          (f) Board of Trustees  Approval.  Sellers shall have  received  within
     five (5)  Business  Days after the date of  execution  and delivery of this
     Agreement by both parties, the approval of the transactions contemplated by
     this Agreement from MGI's Board of Trustees.  Seller shall promptly  notify
     Purchaser  in  writing if and when this  condition  is  satisfied.  If this
     condition is not satisfied,  Seller shall promptly  notify  Purchaser,  the
     Deposit shall be refunded to Purchaser and all  obligations  of the parties
     hereto shall cease and this Agreement shall be void and without recourse to
     the parties hereto (except those provisions which are expressly intended to
     survive such termination).

     4.5 Risk of Casualty Loss; Eminent Domain.

          (a) Risk of Casualty. If prior to the time of Closing, any part of the
     Buildings are damaged by fire or other  casualty,  Sellers  shall  promptly
     give written  notice of such event to Purchaser.  If (a) one or more of the
     Properties is damaged by fire or other casualty (b) the cost of restoration
     is less than One Million Dollars



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<PAGE>
                                                           New England Portfolio

     ($1,000,000)  per Property or Three  Million  Dollars  ($3,000,000)  in the
     aggregate and (c) any Property which has been damaged is not restored prior
     to  Closing,  so long as (i) the  casualty  is a fully  insured  loss under
     Sellers'  insurance  policy  (ii)  Sellers  assign  to  Purchaser  (without
     recourse to  Sellers)  all of Sellers'  rights in any  insurance  proceeds,
     including,  without  limitation,  loss of rent insurance  (less any amounts
     expended or committed by Seller for any  restoration),  (iii) Sellers agree
     to pay Purchaser the amount of any  deductible  under  Sellers'  applicable
     insurance  policy (the  "Deductible  Amount") and (iv) no Lease of all or a
     substantial portion of a Building is reasonably  susceptible to termination
     by the  tenant  thereunder  as a result of the  inability  of the  landlord
     thereunder to restore the premises  within the time period  permitted under
     such  Lease.  Purchaser  shall be  required  to  accept  conveyance  of the
     Properties,  together with such  assignment  of all Seller's  rights in any
     insurance  proceeds and a credit  against the  Purchase  Price in an amount
     equal to the Deductible Amount. If one or more of the Properties is damaged
     by fire or  other  casualty  and not  restored  prior  to  Closing  and the
     conditions  set forth above are not  applicable,  Purchaser  shall have the
     option,  exercisable  by giving  written  notice to Seller on or before the
     Closing  to (a) take  title to all of the  Properties,  in their  condition
     after such  casualty  together  with an  assignment  (without  recourse  to
     Sellers) of Sellers'  rights in any  insurance  proceeds  (less any amounts
     expended or committed by Sellers for any restoration) without any reduction
     in the Purchase Price other than the Deductible  Amount as described above,
     or (b) terminate this Agreement  whereupon the Deposit shall be refunded to
     Purchaser and all obligations of the parties hereto (other than those which
     expressly survive termination) shall cease and this Agreement shall be void
     and without  recourse to the parties.  Purchaser shall not expend or commit
     any insurance proceeds received on account of a casualty which occurs after
     the  date of this  Agreement  for  restoration  without  Purchaser's  prior
     approval, which approval shall not be unreasonably withheld or delayed.

          (b) Eminent  Domain.  In the event any eminent  domain  proceeding not
     disclosed in the Due Diligence Materials or known to Purchaser prior to the
     end of the Inspection  Period involving either (i) a total taking of one or
     more  Properties  or (ii) a partial  taking  which  reduces the fair market
     value of any one Property by One Million  Dollars  ($1,000,000)  or more or
     all of the Properties by Three Million Dollars  ($3,000,000) or more in the
     aggregate  shall be initiated or be pending prior to the Closing,  then, at
     Purchaser's  election by written  notice to Sellers  prior to the  Closing,
     this Agreement shall be terminated  whereupon the Deposit shall be refunded
     to Purchaser and all  obligations  of the parties  hereto (other than those
     which expressly survive  termination)  shall cease and this Agreement shall
     be void and without  recourse to the  parties.  In the event of any eminent
     domain proceeding not disclosed in the Due Diligence  Materials or known to
     Purchaser  prior to the end of the Inspection  Period which does not result
     in the  termination  of this Agreement


                                       13
<PAGE>
                                                           New England Portfolio

     by Purchaser,  this Agreement shall remain in full force and effect and the
     rights and  obligations  of the parties hereto shall continue and Purchaser
     shall take title to all of the  Properties  without  any  reduction  of the
     Purchase  Price but with an  assignment  of Sellers'  rights to recover any
     eminent domain awards (less any amounts expended or committed by Sellers to
     obtain the same).


                    ARTICLE 5. ACTIONS PRIOR TO THE CLOSING
                               ----------------------------

     5.1 Access to Properties;  Inspection Period.  Sellers shall give Purchaser
reasonable rights to enter the Properties during and after the Inspection Period
in  accordance  with the Right of Entry  Agreement  attached as Exhibit G, which
agreement shall be executed by the parties at the time of execution and delivery
of this  Agreement.  Following the Inspection  Period,  Purchaser shall have the
continuing  right of  inspection  and  review,  but no right to  terminate  this
Agreement on the basis of such review.

     5.2.  Continuation  of  Operations.  Sellers shall  continue to operate and
maintain the Properties in a commercially  reasonable manner consistent with the
operations  at the  time of the  signing  of  this  Agreement.  Sellers  make no
representations   and  assumes  no  responsibility  with  respect  to  continued
occupancy  of any Building by any tenant or tenants now in  possession.  Sellers
shall  maintain  casualty  insurance  on the  Properties  through the Closing as
currently insured.

     5.3. New Leases. Except as otherwise provided herein,  Sellers agree not to
enter into any new leases or any amendments of or modifications to, the existing
Leases with respect to the Properties (each, a "New Lease") prior to the Closing
without the prior  written  consent of  Purchaser,  which  consent  shall not be
unreasonably  withheld and which shall be deemed  granted if Purchaser  does not
respond within three (3) Business Days after delivery of any written request for
consent setting forth the business terms of the proposed lease,  including,  all
material information with respect to leasing commissions, tenant improvements to
be  paid  or  performed  by  landlord,  other  tenant  allowance  items  and any
information  in  Sellers'  possession  regarding  the  creditworthiness  of  the
proposed tenant.  Sellers shall deliver to Purchaser a true and complete copy of
each such New Lease, if any,  promptly after the execution and delivery thereof.
All such New  Leases  which have been  consented  to or deemed  consented  to by
Purchaser shall hereinafter be referred to as "Approved Leases". Notwithstanding
the  above,  each  Seller  may enter into any New Lease at any time prior to the
date three (3) Business  Days before the  expiration  of the  Inspection  Period
(such date, the "Notice Date")  without  Purchaser's  consent and such New Lease
shall be an Approved Lease,  provided that on or before the Notice Date,  Seller
delivers a fully executed copy of such New Lease to Purchaser  together with the
information  described above. Sellers agree to keep Purchaser generally informed
of any potential new leases and the status of all material  lease  negotiations.
Notwithstanding  the above, the exercise of any


                                       14
<PAGE>
                                                           New England Portfolio

existing  renewal,  expansion  or extension  option  granted to a Tenant under a
Lease  shall not be  deemed a New Lease or  subject  to the  provisions  of this
Section and Purchaser  shall accept the Properties  subject to such Lease, as so
renewed,  expanded or extended.  Seller shall promptly  notify  Purchaser of the
exercise of any existing renewal, expansion or extension option by a Tenant.

     5.4 Service Contracts.  Unless otherwise instructed by Purchaser in writing
on or before the end of the  Inspection  Period,  Sellers  shall  terminate  all
service,  equipment,  supply, maintenance or concession agreements listed on the
attached   Exhibit  H  and  all  brokerage   agreements   listed  on  Exhibit  P
(collectively,  "Service  Contracts")  between  Sellers and any third party with
respect  to each  Property  as of the  Closing  and shall not enter into any new
service  contract,  unless such contract is terminable by Sellers at the time of
Closing. Any Service Contracts which Purchaser requests Sellers not to terminate
and which by their terms are  assignable  shall be  referred to as the  "Assumed
Service Contracts."

     5.5 Construction  Contracts;  Work in Progress.  Prior to Closing,  Sellers
shall continue to perform,  and use good faith efforts to complete,  the work in
progress and work  scheduled to begin after the date of this Agreement and prior
to the  Closing  Date  described  in Exhibit R  attached  hereto and made a part
hereof to the extent  such work is  contemplated  to be  performed  prior to the
Closing  Date as set forth on Exhibit R. To the  extent  any work  described  in
Exhibit R is identified  thereon as a "Seller's  Expense" and is not paid for by
Sellers prior to Closing,  Purchaser  shall receive a credit at Closing equal to
the amount  necessary to complete such work after the Closing and/or the balance
due under such contracts.  To the extent any work described in Exhibit R is paid
for by Sellers prior to Closing,  including,  without limitation, work described
in Exhibit R as completed but not yet paid for as of the date of this Agreement,
and is  identified  on Exhibit R as a  "Purchaser's  Expense"  Sellers  shall be
reimbursed  by  Purchaser  at  Closing.  At  Closing,  Seller  shall  assign and
Purchaser shall assume, pursuant to the Assignment of Contracts (defined below),
all of Sellers' obligations under the construction contracts listed in Exhibit R
for  which  the  work  has not  yet  been  completed  and  paid in full  and all
construction contracts for Approved Leases.

     5.6 Insurance.  Sellers shall maintain the property insurance  currently in
effect for the Properties  through the Closing Date,  including full replacement
cost casualty  insurance and loss of rent insurance for a period of up to twelve
(12) months.

     5.7 MGI Lease. The parties agree to renegotiate the Lease of MGI's space in
the  Property  located at One  Winthrop  Square,  Boston,  Massachusetts  within
twenty-one (21) days after the date of this Agreement upon reasonable,  mutually
satisfactory terms, with due regard given to MGI's announced plan of liquidation
and its need for a flexible term.

                                       15
<PAGE>
                                                           New England Portfolio

                         ARTICLE 6. CLOSING OBLIGATIONS
                                    -------------------

     6.1  Sellers'  Deliverables.  At the  Closing,  Sellers  shall  deliver the
following to Purchaser:

          (a) Deeds in the forms of (i) statutory  quitclaim  deeds with respect
     to Properties  located in Massachusetts  and New Hampshire,  (ii) quitclaim
     deeds with covenants with respect to Properties  located in Maine and (iii)
     limited  warranty  deeds with respect to Properties  located in Connecticut
     (collectively,  the "Deeds")  conveying  good,  record and  marketable  fee
     simple title  thereto  subject to the Permitted  Encumbrances,  executed in
     proper form for recording and registration,  if applicable, so as to convey
     the  title to the Land and  Buildings  as  required  by this  Agreement  to
     Purchaser;

          (b) Such  customary  affidavits  as  Purchaser's  title  insurer shall
     reasonably  require in order to issue,  without  extra  charge,  an owner's
     policy of title insurance free of any exceptions for unfiled  mechanics' or
     materialmens'  liens for work  performed  prior to the Closing Date, or for
     rights of parties in possession other than the tenants under the Leases and
     any Approved Leases;

          (c)  Bills  of sale for the  Personal  Property  in the form  attached
     hereto as Exhibit I, duly executed and acknowledged by each Seller.

          (d) Assignment  and  assumption of the Leases and any Approved  Leases
     (the "Assignments of Leases") in the form attached hereto as Exhibit J;

          (e) A certification of non-foreign status, in form required by Section
     1445(f)(3) of the Internal Revenue Code;

          (f) Evidence  satisfactory  to  Purchaser's  title insurer of Sellers'
     authority to convey the Properties, deliver the Deeds and the Assignment.

          (g) Copies of all Leases and Approved  Leases and all  amendments  and
     modifications thereto;

          (h) A letter,  executed by Seller  advising  each of the tenants under
     the  Leases  and the  Approved  Leases  of the  sale of the  Properties  to
     Purchaser and  directing  that rents and other  payments  after the Closing
     Date be sent to Purchaser;

          (i) Such  estoppel  certificates  from each tenant of the Leases as to
     the matters set forth in Exhibit D as Sellers have obtained;



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<PAGE>
                                                           New England Portfolio

          (j) Any estoppel  certificates  from Sellers  required  under  Section
     4.1(d);

          (k) A general assignment  (non-recourse to Seller as to obligations of
     third parties) of all permits, licenses, warranties and guarantees relating
     to the  Properties  together  with  original  copies  of any such  permits,
     licenses, warranties and guarantees in Seller's possession;

          (l) An Assignment and Assumption of any Assumed Service  Contracts and
     Construction   Contracts   which  Purchaser  is  required  to  assume  (the
     "Assignments of Contracts") in the form attached hereto as Exhibit M;

          (m) Any other customary  documents that Purchaser's  title insurer may
     reasonably  require  for  the  proper   consummation  of  the  transactions
     contemplated by this  Agreement,  provided such documents do not impose any
     contingent liability on Seller after the Closing;

          (n) An executed counterpart of the Settlement Statement;

          (o)  Transfer  tax  declarations  or forms to the extent  required  by
     applicable Law (defined below);

          (p) Lease files,  books and records for the  Properties  and plans and
     specifications  for  the  Properties  all to  the  extent  in the  Seller's
     possession;

          (q)  Originals or copies to the extent in Sellers'  possession  of all
     service and construction contracts being assumed by Purchaser at Closing;

          (r) A release from the Broker;

          (s)  Keys  to  locks  at the  Properties  to the  extent  in  Seller's
     possession;

          (t)  Assignments  of  insurance  and/or  eminent  domain  proceeds  if
     applicable;

          (u) Excise tax lien waivers to the extent  required by applicable  Law
     (defined below); and

          (v) Evidence of termination of all property  management  contracts and
     evidence of  termination  of other  service  contracts not being assumed by
     Purchaser at Closing.

     6.2 Purchaser's Deliverables.  At the Closing,  Purchaser shall deliver the
following to Sellers:


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<PAGE>
                                                           New England Portfolio

          (a). All documents  reasonably  required by the Andover Lender for the
     transfer of the Assumed Debt to Purchaser;

          (b) The balance of the cash portion of the Purchase  Price  payable at
     the Closing;

          (c) The  Assignments  of Leases  duly  executed  and  acknowledged  by
     Purchaser;

          (d) The  Assignments  of Contracts duly executed and  acknowledged  by
     Purchaser;

          (e)  Evidence   reasonably   satisfactory  to  Seller  of  Purchaser's
     authority to purchase of the Properties,  deliver the Purchase  Price,  the
     Assignments  of Leases,  Assignment of Contracts and perform and consummate
     all other transactions contemplated by this Agreement;

          (f) An  agreement  in  form  and  substance  satisfactory  to  Sellers
     indemnifying  and holding  Sellers  harmless from any loss, cost or expense
     incurred by Sellers  arising out of any failure of Purchaser to perform all
     obligations  of Sellers  under all  documents or  agreements  evidencing or
     securing the Assumed Debt which accrue from and after the Closing;

          (g) Any other  customary  documents  that Sellers or the Title Insurer
     may  reasonably  require for the proper  consummation  of the  transactions
     contemplated by this Agreement; and

          (h) An executed counterpart of the Settlement Statement.


                ARTICLE 7. MATTERS TO WHICH THE SALE IS SUBJECT
                           ------------------------------------

     7.1 Condition of Title.  The  Properties  are to be conveyed by Sellers and
accepted by Purchaser subject only to the following matters:

          (a) Any state of facts which a survey of the Land or an examination of
     title would  disclose and not objected to by Purchaser by the conclusion of
     the Inspection Period;

          (b)  all  laws,  statutes,   ordinances,  codes,  rules,  regulations,
     requirements,  or executive mandates (collectively,  the "Laws") including,
     without limitation,  all environmental,  building and zoning  restrictions,
     ordinances and regulations,  affecting the Properties adopted by the United
     States, the applicable state and


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                                                           New England Portfolio

     municipal  authorities,   and  any  and  every  other  agency,  department,
     instrumentality  and/or  political  subdivision of government of every kind
     whatsoever  having  jurisdiction  thereof,  and all amendments or additions
     thereto  now in effect or which may be in force and  effect on the  Closing
     Date;

          (c) The Leases and all Approved Leases;

          (d) Unpaid real estate taxes,  assessments,  water,  sewer and utility
     charges  not yet due and  payable,  subject  to  subsequent  adjustment  as
     hereinafter provided;

          (e) The Permitted  Encumbrances,  including,  without limitation,  the
     liens of all Assumed Debt.

     7.2  Application  of  Purchase  Price to Liens.  To enable  Sellers to make
conveyance  as herein  provided,  Sellers  may, at the time of Closing,  use the
Purchase  Price  or  any  portion  thereof  to  clear  the  title  of any or all
encumbrances  or  interests;  provided  that all  instruments  so  procured  are
recorded at Sellers' expense  simultaneously with the recording of the Deeds, or
pursuant to reasonable and customary arrangements made with the Title Company so
as to enable it to issue Purchaser's title insurance  policies without exception
for such liens.

                    ARTICLE 8. REPRESENTATIONS AND WARRANTIES
                               ------------------------------

     8.1  Purchaser's  Knowledge.  Purchaser  represents and warrants to Sellers
that it is a sophisticated  and experienced owner and manager of commercial real
estate. Purchaser acknowledges that Sellers are providing Purchaser satisfactory
opportunity for full and complete reviews, inspections and investigations of the
Properties and all  information  relating to the physical,  legal,  economic and
environmental  condition  of the  Properties  as the  Purchaser  may in its sole
discretion  elect to make.  Purchaser has assumed fully the risk that  Purchaser
will fail to completely and adequately review and consider any or all of the Due
Diligence  Materials or to complete its other due diligence  prior to the end of
the Inspection Period. But for Purchaser's  willingness to assume the risk as to
the character of its reviews,  inspections and  investigations of the Properties
and all information relating to the physical,  legal, economic and environmental
condition of the Properties as the Purchaser may in its sole discretion elect to
make, Sellers would not have entered into this Agreement.  As a material part of
the consideration  for this Agreement,  Sellers and Purchaser agree that, except
for  representations  and  warranties  expressly  set  forth in this  Agreement,
Purchaser  is taking the  Properties  "as is, where is and with all faults" with
any and all latent and patent  defects  and that there is no warranty by Sellers
that the  Properties  are fit for a  particular  purpose.  Except  as  expressly
provided in this Agreement, Sellers have not made and are not making any express
or implied  representation  or  warranty of any kind or nature,  including,  but
without  limitation,   any  representation  or  warranty  regarding  quality  of
construction, condition, state of repair, safety, merchantability or fitness for
any particular

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                                                           New England Portfolio

purpose,  accuracy of  dimensions,  whether the  improvements  are  structurally
sound, in good condition or repair or in compliance with insurance  requirements
or applicable  laws,  ordinances,  rules,  regulations of any nature,  any past,
present or future  operating  results,  forecasts  or  projections  of income or
operating   expenses,   the  financial   viability  of  the  Properties  or  the
completeness  or accuracy of the Due  Diligence  Materials or Sellers  books and
records.  Purchaser  acknowledges  that, except for the specific  warranties set
forth in this Agreement, it is not relying upon any representation, statement or
other assertion with respect to the Properties'  condition,  but is relying upon
its own inspections, investigations,  examinations and financial analysis of the
Properties.  Purchaser takes the Properties under the express understanding that
there are no express or implied  warranties  (except for the limited  warranties
expressly set forth in this Agreement). The provisions of this Section 8.1 shall
survive closing.

     8.2.  Seller's  Representations.  Each of the Sellers hereby represents and
warrants and agrees as follows,  both as of the date of this Agreement and as of
the Closing Date with respect to the Property owned by such Seller.

          (a) Legal  Existence.  Seller is an entity  duly  formed  and  validly
     existing under the laws of a state or commonwealth and is duly qualified to
     do business in the state or  commonwealth  where the respective  Properties
     are located;  the signatory of this  Agreement has full power and authority
     as a representative  to enter into this Agreement and to perform all of its
     obligations required hereunder.

          (b)  Authority.  Subject to  Section  4.4(f)  hereof,  Seller has been
     authorized by all necessary  parties to execute and deliver this  Agreement
     and  to  carry  out  its   obligations   hereunder  and  the   transactions
     contemplated   hereby.   This   Agreement  has  been,   and  the  documents
     contemplated  hereby will be, duly  executed  and  delivered  by Seller and
     constitute legal, valid and binding obligations  enforceable against Seller
     in accordance with their  respective  terms.  The consummation by Seller of
     the sale of the Properties is not in violation of or conflict with nor does
     it constitute a default  under any term or provision of the  organizational
     documents of Seller, or of any provision of any applicable law,  ordinance,
     rule or regulation of any governmental authority or of any provision of any
     applicable  order,   judgment  or  decree  of  any  court,   arbitrator  or
     governmental authority.

          (c)  Litigation.  Except  as set  forth in  Exhibit  K,  Sellers  have
     received no written  notices of any actions or  proceedings  pending before
     any court,  administrative  agency or arbitrator  against Seller or arising
     out of the  ownership,  management  or  operation of the  Properties,  this
     Agreement or the transactions  contemplated  hereby,  other than litigation
     which is  covered by  insurance  and with  respect  to which the  insurance
     carrier  has  acknowledged  coverage  and to Seller's  knowledge,  none are
     threatened.



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                                                           New England Portfolio

          (d)  Bankruptcy.  No  proceedings  have been filed by Seller  and,  to
     Seller's knowledge, no proceedings have been filed against Seller under the
     United States  Bankruptcy  Code, or any state law relating to bankruptcy or
     insolvency,  seeking  liquidation of Seller or its  reorganization  nor has
     there been any general assignment for the benefit of Seller's creditors, or
     an appointment of a trustee or receiver for its assets.

          (e) Eminent Domain. Except as generally disclosed in and identified on
     Exhibit Q the details of which are included in the Due Diligence Materials,
     Sellers  have  received no written  notices of any pending  eminent  domain
     proceedings  against  any  Property  or any part  thereof  and to  Seller's
     knowledge none are threatened.

          (f) Leases. To Seller's knowledge,  (i) there are no leases, occupancy
     agreements or,  subject to the  provisions of Section 15.5 below,  licenses
     affecting  the  Property  except for the Leases (or at the time of Closing,
     the New Leases);  (ii) the Leases are valid and in full force  effect,  and
     except as referred to in Exhibit E, have not been  modified,  in writing or
     otherwise;  (iii)  except set forth in Exhibit E, no tenant under any Lease
     is in default in the payment of fixed rent by more than thirty (30) days or
     otherwise in default  after the  expiration  of any  applicable  notice and
     grace periods under the  applicable  Lease,  (iv) Seller is not holding any
     security deposit or letter of credit securing the obligations of any tenant
     under a Lease,  except  as  provided  in  Exhibit  E, (v)  Seller is not in
     default of any material construction or tenant improvement obligation under
     any  existing  Lease  except as set forth in  Exhibit  T, and (vi) true and
     complete  copies of the  Leases  have been  included  in the Due  Diligence
     Materials.

          (g)  FIRPTA.  Seller is not a  "foreign  person" as defined in Section
     1445(f)(3) of the Internal Revenue Code.

          (h) Service  Contracts.  To Seller's  knowledge,  there are no service
     contracts  affecting the  Properties  except for the  agreements  listed on
     Exhibit H (the "Service Contracts");

          (i) Brokerage Agreements. To Seller's knowledge there are no brokerage
     agreements  or tenant  representation  agreements  affecting  the  Property
     except for the brokerage  agreements and tenant  representation  agreements
     listed on Exhibit P.

          (j) Andover Street Loan Documents. The documents listed in Exhibit B-7
     attached hereto constitute all of the documents evidencing and securing the
     Andover Street Debt (the "Andover  Street Loan  Documents") and the Andover
     Street Loan Documents have not been altered,  modified or amended except as
     set


                                       21
<PAGE>
                                                           New England Portfolio

     forth in such  Exhibit  B-7.  Seller is not in default of any  material
     obligation of Seller under the Andover Street Loan Documents.

     8.3 Knowledge. The reference to "the Seller's knowledge" as used in Section
8.2 shall be deemed to mean the actual  knowledge of the  executive  officers of
MGI (meaning any officer of MGI with a title of vice president or above) with no
independent  inquiry  having  been  made by such  person or  persons;  provided,
however,  that as used  in  subsection  8.2(f),(h)  and (i) the  term  "Seller's
knowledge"  shall  mean,  even if none of the  executive  officers  have  actual
knowledge of a matter referred to in subsection  8.2(f),  Seller shall be deemed
to have knowledge of any service contract, brokerage agreement, lease agreement,
lease  amendment  or other  agreement  affecting  the  Property  executed  by an
executive officer of MGI during the period of Seller's ownership of the relevant
Property.  Sellers have made no independent  examination of the facts related to
the physical  condition of the Properties and no  representation  is made by any
Seller with respect thereto except as specifically  set forth in this Agreement.
Sellers shall not be  responsible  for any errors or  misrepresentations  of any
third parties including,  without limitation,  as may be included in promotional
materials,  environmental  reports,  structural  reports  or  other  third-party
materials  delivered in connection with this Agreement  unless actually known to
Sellers to be  incorrect  or untrue and unknown to  Purchaser  as of the Closing
Date.  Further,  to  the  extent  Sellers  or  any  third  party  have  provided
information  in summary  form (such as rent rolls or lease  abstracts),  Sellers
shall not be  responsible  for good faith errors or omissions  made in preparing
such  summaries  as  long as the  accurate  information  is  included  in  other
materials (such as Leases) delivered in full to Purchaser.

     8.4. Survival.  The  representations and warranties of Sellers set forth in
Section 8.2 shall not survive the  termination or cancellation of this Agreement
but shall  survive the  Closing  for a period of six (6) months  (the  "Survival
Period").  In no event shall Sellers be liable for breach of any  representation
or warranty  with  respect to any matter  which is covered in the Due  Diligence
Materials or in any estoppel certificate delivered to Purchaser prior to Closing
or is  known by  Purchaser  to be  inaccurate  as of the  date of  Closing.  The
reference "known by Purchaser" as used herein shall be deemed to mean the actual
knowledge of Samuel T. Byrne,  William H.  Kremer,  Terrence J. Murray and Brian
Chaisson.   Further,   Sellers  shall  have  no  liability  under  any  estoppel
certificate  delivered by Sellers  hereunder with respect to any matter which is
confirmed  in a  subsequent  estoppel  certificate  from a  tenant  received  by
Purchaser from a tenant under an applicable Lease. Sellers shall be permitted to
update the  representations  and warranties made by Sellers herein at Closing to
reflect  matters which become known to Sellers after the date of this  Agreement
and  changes  in facts  occurring  after  the date of this  Agreement.  All such
updated  representations  and warranties shall be deemed acceptable to Purchaser
unless such updated representations and warranties disclose a materially adverse
change in the condition of any of the Properties.  Furthermore, Purchaser agrees
not to look to Sellers  and  Purchaser  shall have no claim  against  Sellers on
account of any loss, cost or expense


                                       22
<PAGE>
                                                           New England Portfolio

incurred  by  Purchaser  as the  result  of any  breach  of the  warranties  and
representations  set forth herein,  except to the extent such losses,  costs and
expenses  exceed Seven  Hundred and Fifty  Thousand  Dollars  ($750,000)  in the
aggregate,  but in no event shall Sellers' aggregate  liability to Purchaser for
any breach of its warranties and representations hereunder,  including,  without
limitation, in any estoppel certificate delivered to Purchaser by Seller, exceed
the sum of Ten Million  Dollars  ($10,000,000)  in the  aggregate.  In addition,
Purchaser  shall have no rights  against  Seller for  breach of  warranties  and
representations unless Purchaser institutes legal proceedings against any Seller
or Sellers for such breach within the Survival  Period.  Purchaser  acknowledges
that the Board of Trustees of MGI will rely on the  agreements set forth in this
Section  in  connection  with the  distribution  of  funds  to its  shareholders
pursuant  to its  adopted  plan of  liquidation  and that  this  provision  is a
material inducement to Sellers entering into this Agreement.  During the term of
this Agreement and, if Purchaser  acquires the Properties in accordance with the
terms of this Agreement, continuing until the end of the Survival Period (or, if
Purchaser  institutes legal  proceedings  against any Seller or Sellers for such
breach within the Survival Period, until the final adjudication or resolution of
such  proceedings),  Sellers  agree that if the stock of MGI ceases to be listed
for  trading  on  the  New  York  Stock  Exchange,   Sellers  shall   thereafter
collectively  maintain  a minimum  net  worth,  calculated  in  accordance  with
generally  accepted  principals of accounting of at least Twenty Million Dollars
($20,000,000) or in the alternative, Sellers shall provide collateral reasonably
acceptable  to Purchaser to satisfy its  contingent  liability for breach of its
warranties and representations set forth herein which survive the Closing.

     8.5 Purchaser's Representations.  Purchaser hereby represents, warrants and
agrees as follows,  both as of the date of this  Agreement and as of the Closing
Date.

          (a) Corporate  Existence - Purchaser.  Purchaser is a corporation duly
     organized,  validly  existing  and in good  standing  under the laws of the
     Commonwealth  of  Massachusetts  and is (or will be,  prior to the Closing)
     duly  qualified  to do  business  in the states  where the  Properties  are
     located and has full power and  authority to enter into this  Agreement and
     to perform all of its obligations required hereunder.

          (b)  Authority  -  Purchaser.  Purchaser  (including  any  individuals
     executing on behalf of Purchaser) has all requisite  power and authority to
     execute  and  deliver  this  Agreement  and to  carry  out its  obligations
     hereunder and the transactions contemplated hereby. This Agreement has been
     duly executed and delivered by Purchaser and constitutes  legal,  valid and
     binding obligations  enforceable against Purchaser in accordance with their
     respective  terms.  The  consummation  by  Purchaser of the purchase of the
     Properties as  contemplated  hereby is not in violation of or conflict with
     nor  does it  constitute  a  default  under  any term or  provision  of the
     organizational documents of Purchaser, or any of the terms of any agreement
     or



                                       23
<PAGE>
                                                           New England Portfolio

     instrument  to  which it is a party,  or by  which it is  bound,  or of any
     provision of any  applicable  law,  ordinance,  rule or  regulation  of any
     governmental  authority  or of  any  provision  of  any  applicable  order,
     judgment or decree of any court, arbitrator or governmental authority.

          (c) No Further Consents Required. Purchaser has obtained all necessary
     approvals and consents to the due execution and delivery of this  Agreement
     and the consummation of the transactions herein described.

     8.6 Complete Agreement. This Agreement,  including the Exhibits attached to
this Agreement and  references  contained in this  Agreement,  together with the
Escrow  Agreement  and the  Right  of  Entry  Agreement  constitute  the  entire
agreement and  understanding  of the parties  hereto with respect to the subject
matter  hereof  and  supersedes  all  prior   agreements,   proposals,   offers,
counteroffers,  letter  agreements,  correspondence  and  understandings  of the
parties regarding said subject matter,  whether written or oral, with respect to
the  transactions  provided  for  herein,  including,  without  limitation,  the
Principal  Indemnity  and  Confidentiality  Statement  dated August 24, 1998, as
amended by a letter dated March 4, 1999, all of which are hereby merged into and
superseded by this Agreement.

                        ARTICLE 9. ENVIRONMENTAL MATTERS

     9.1 Hazardous  Substances.  As of the Closing Date,  Purchaser shall waive,
release,  acquit and forever  discharge  Sellers of and from any and all claims,
actions,  causes of  action,  demands,  rights,  damages,  costs,  expenses,  or
compensation  whatsoever,  direct or  indirect,  known or  unknown,  foreseen or
unforeseen,  statutory or at common law, which Purchaser, or any person claiming
by,  through  or under  Purchaser,  now has or which may arise in the  future on
account of or in any way growing out of or in  connection  with the existence of
any Hazardous  Substance or Hazardous  Discharge (as hereinafter  defined) on or
from the  Properties.  For  purposes  of this  Agreement,  the  term  "Hazardous
Substances"  shall include,  without  limitation,  (a) any element,  compound or
chemical that is defined,  listed or otherwise classified as a pollutant,  toxic
pollutant,  toxic  or  hazardous  substance,  hazardous  waste,  special  waste,
extremely  hazardous  substance or chemical  under any  environmental  laws; (b)
petroleum and its refined  products and  petroleum-derived  substances;  (c) any
electrical  equipment  containing oil that has more than 50 parts per million of
polychlorinated biphenyls ("PCBs"); (d) any flammable substances,  explosives or
radioactive  materials;  and (e) building components,  including but not limited
to, asbestos-containing materials and manufactured products containing Hazardous
Substances.  For purposes of this Section, the term "Hazardous  Discharge" means
any  releasing,   spilling,  leaking,  pumping,  pouring,  emitting,   emptying,
discharging,  injecting,  escaping,  leaching, disposing or dumping of Hazardous
Substances from or onto the Land and Buildings.



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<PAGE>
                                                           New England Portfolio

     9.2  Survival.  The  provisions of Section 9.1 shall survive the Closing or
any termination or cancellation of this Agreement.


                ARTICLE 10. CLOSING ADJUSTMENTS AND OBLIGATIONS
                            -----------------------------------

     10.1  Prorations.  In addition to the costs and expenses in connection with
Assumed Debt which are covered elsewhere in this Agreement,  the following items
shall be  apportioned  and  adjusted  between  Sellers and  Purchaser  as of the
Closing  Date and the net amount  determined  to be payable  to  Sellers,  or to
Purchaser,  as the case may be, is to be paid (or credited  against the Purchase
Price) on the  Closing  Date,  except as  otherwise  expressly  provided in this
Article 10.

          (a) Taxes. Real estate taxes,  personal property taxes and any general
     or special  assessments  with respect to the  Properties  which are not the
     direct  payment  obligation  of tenants  pursuant to the Leases or Approved
     Leases (as opposed to a reimbursement  obligation)  shall be prorated as of
     the Closing Date -- to the end that Sellers  shall be  responsible  for all
     taxes and assessments that are allocable to any period prior to the Closing
     Date and Purchaser shall be responsible for all taxes and assessments  that
     are  allocable to any period from and after the Closing Date. If the actual
     amount of taxes,  assessments  or other amounts to be prorated for the year
     in which  the  Closing  occurs  is not known as of the  Closing  Date,  the
     proration  shall be  based on the  parties'  reasonable  estimates  of such
     taxes,  assessments  and other amounts.  To the extent any real or personal
     property taxes subject to  apportionment  in accordance  with the foregoing
     are,  as of the  Closing  Date,  the  subject of any appeal  filed by or on
     behalf of Sellers, then notwithstanding  anything to the contrary contained
     in this  subparagraph,  the proration shall be based on the amount of taxes
     previously paid with an adjustment to be made promptly after the outcome of
     the appeal is final and the amount of taxes  owing  becomes  fixed.  To the
     extent  any taxes  which  are the  subject  of an appeal  have been paid by
     Sellers  under  protest  and the appeal  results in  Purchaser  receiving a
     credit  toward  future tax  liability or a refund,  then  Purchaser  shall,
     within ten (10) days  following  receipt  of such  refund or notice of such
     credit,  pay to Sellers the full amount of such refund or credit  allocable
     to the period prior to the Closing Date, excluding, however, any portion of
     such refund or credit that is required to be passed  through to the tenants
     pursuant  to any Lease or to other  parties by  existing  contract.  Seller
     shall retain the right to prosecute and receive the proceeds of any appeals
     of taxes for any tax year prior to the current tax year.  Seller shall turn
     over to Purchaser  all of its rights to prosecute  any appeals of taxes for
     the current tax year.

          (b) Prepaid  Expenses.  Purchaser  shall be charged for those  prepaid
     expenses  paid by Sellers  directly or  indirectly  allocable to any period
     from and after the Closing  Date,  including,  without  limitation,  annual
     permit and  confirmation  fees,


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<PAGE>
                                                           New England Portfolio

     fees for  licenses and all  security or other  deposits  paid by Sellers to
     third parties which Purchaser  elects to assume and to which Purchaser then
     shall be entitled to the  benefits  and any refunds  following  the Closing
     Date.

          (c)  Property  Income  and  Expense.   The  following  prorations  and
     adjustments  shall  occur as of the  Closing.  Prior to the  Closing  Date,
     Sellers shall provide all  information  to Purchaser  required to calculate
     such prorations and adjustments and representatives of Purchaser and Seller
     shall together make such calculations:

               (i) General.  Subject to the specific provisions of clauses (ii),
          (iii) and (iv)  below,  income and  expenses  shall be prorated on the
          basis of a 30-day  month.  All such items  attributable  to the period
          prior to the Closing Date shall be credited to Sellers; all such items
          attributable  to the period on and following the Closing Date shall be
          credited  to  Purchaser.  Purchaser  shall  be  credited  with (A) any
          security  deposits or other lease payments which are refundable to the
          tenants and have not been applied to outstanding tenant obligations in
          accordance  with the  terms of the  applicable  Lease;  provided  that
          during  the  period  of this  Agreement,  Sellers  shall not apply any
          security deposit to the payment of fixed rent unless the Lease expires
          prior to the Closing  and (B) rent  prepaid  beyond the Closing  Date.
          Sellers  shall  transfer  Sellers'  entire  interest in any letters of
          credit or certificates of deposit held by Sellers as security deposits
          described  in clause  (A) above and shall  diligently  cooperate  with
          Purchaser in obtaining any reissuance or confirmation of the effect of
          the transfer of such  instruments.  Purchaser shall not be entitled to
          any  interest on rental  agreement  or lease  deposits or prepaid rent
          accrued on or before the Closing  Date,  except to the extent any such
          amount of  interest  is  refundable  or payable to any tenant  under a
          Lease. Sellers shall be credited with any refundable deposits or bonds
          held by any utility, governmental agency or service contractor, to the
          extent such deposits or bonds are assigned to Purchaser on the Closing
          Date.

               (ii) Leasing  Costs.  Except as otherwise  expressly set forth in
          the  attached  Exhibit L, (A)  Purchaser  shall be  credited  with any
          leasing commissions,  tenant improvements costs or other allowances to
          be paid or  assumed by  Purchaser  on or after the  Closing  Date with
          respect  to the  current  term  of any  Lease  or  Lease  modification
          executed, or any extension term or expansion of premises exercised, in
          each case,  prior to the date of this Agreement or with respect to any
          Approved Lease, the effective lease  commencement  date under which is
          prior to June 1, 1999,  and Sellers shall pay on or before the Closing
          Date all such items  payable  prior to the Closing  Date;  (B) Sellers
          shall be credited with any leasing commissions,  tenant



                                       26
<PAGE>
                                                           New England Portfolio

          improvement or other  allowances  paid or endured by Sellers after the
          date hereof with respect to any Approved  Lease,  the effective  lease
          commencement  date  under  such  Approved  Lease  is June  1,  1999 or
          thereafter;  and (C) Purchaser  shall assume all  obligations  for any
          leasing  commissions,  tenant  improvement or other allowances payable
          following the Closing Date with respect to such Approved  Leases,  the
          effective  lease  commencement  date  under  which is June 1,  1999 or
          thereafter.  Any  expenditures  or commitments to  expenditures  (and,
          therefore,  any credit to Sellers based on Sellers' expenditures prior
          to the Closing Date)  relating to the Approved  Leases,  to the extent
          they were not referenced in the Approved  Leases,  shall be subject to
          Purchaser's   specific   approval,   which   approval   shall  not  be
          unreasonably withheld or delayed.

               (iii) Rents.  (A) Rents  payable by tenants  under the Leases and
          any  Approved  Leases,  if  applicable,  shall be prorated as and when
          collected  (whether such  collection  occurs prior to, on or after the
          Closing  Date).  Purchaser  shall  receive  a credit  for the  amounts
          actually  received by Seller before the Closing Date and which pertain
          to any period after the Closing  Date.  Purchaser  shall not receive a
          credit at the Closing for any rents for the month in which the Closing
          occurs which are in arrears and have not then been received. As to any
          tenants who are delinquent in the payment of rent on the Closing Date,
          Purchaser  shall use reasonable  efforts (but shall not be required to
          commence  legal  action or  terminate or evict a tenant) to collect or
          cause to be collected  such  delinquent  rents  following  the Closing
          Date.  Any and all  rents so  collected  by  Purchaser  following  the
          Closing shall be  successively  applied to the payment of (x) rent due
          and payable in the month in which the Closing occurs, (y) rent due and
          payable in the months succeeding the month in which the Closing occurs
          (through  and  including  the month in which  payment is made) and (z)
          rent due and  payable in the months  preceding  the month in which the
          Closing occurs.  If all or part of any rents or other charges received
          by Purchaser  following the Closing are allocable to Sellers  pursuant
          to the  foregoing  sentence,  then such sums shall be promptly paid to
          Sellers.  Sellers  reserve  the right to  pursue  any  damages  remedy
          Sellers may have  against any tenant with  respect to such  delinquent
          rents,  but shall have no right to exercise  any other  remedy under a
          Lease  (including,  without  limitation,  termination or eviction) and
          shall not commence  any legal action  against a tenant for a period of
          90 days following the Closing Date.

               (B) Any  percentage  rent,  escalation  charges  for real  estate
          taxes, parking charges, operating and maintenance expenses, escalation
          rents or charges, electricity charges, cost of living increases or any
          other charges of a similar  nature other than fixed or base rent under
          the Leases and any

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          Approved Leases, if applicable (collectively,  the "Additional Rents")
          shall be prorated as of the Closing  Date based on  estimated  amounts
          charged and collected.  Prior to the end of the calendar year in which
          the Closing occurs,  Sellers shall provide  Purchaser with information
          regarding  Additional  Rents which were  received by Sellers  prior to
          Closing and the amount of reimbursable  expenses paid by Sellers prior
          to  Closing.  On or before the date ninety (90) days after the Closing
          and  periodically  thereafter,  Purchaser  shall  deliver to Sellers a
          reconciliation of all Additional Rents due or expenses reimbursable by
          tenants under the Leases and any Approved Leases,  if applicable,  and
          the amount of  Additional  Rents  received  by Sellers  and  Purchaser
          relating thereto (the  "Reconciliation").  The Reconciliation shall be
          based upon  Additional  Rents actually  collected by Purchaser and the
          corresponding  expenses.  To the  extent  Additional  Rents  due  from
          tenants  have not been  received  by  Purchaser,  that  portion of the
          Reconciliation  shall be delayed  until such amounts are collected and
          Purchaser  shall  continue  to use  diligent  efforts to collect  such
          Additional  Rents from tenants.  Purchaser  shall  deliver  additional
          Reconciliation  statements on a periodic  basis,  not more  frequently
          than  monthly,  after the date  ninety (90) days after  Closing.  Upon
          reasonable  notice and during normal business hours,  each party shall
          make  available to the other all  information  reasonably  required to
          confirm  the  Reconciliation.  In  the  event  of any  overpayment  of
          Additional  Rents by the tenants to Sellers,  Sellers shall  promptly,
          but in no event  later  than  fifteen  (15) days  after  receipt  of a
          Reconciliation,  pay to Purchaser the amount of such  overpayment  and
          Purchaser,  as the landlord  under the  particular  Leases or Approved
          Leases,  if applicable,  shall pay or credit to each applicable tenant
          the amount of such  overpayment.  In the event of an  underpayment  of
          Additional  Rents by the  tenants to Sellers,  Purchaser  shall pay to
          Sellers  the  amount of such  underpayment  within  fifteen  (15) days
          following Purchaser's receipt of any such amounts from the tenants.

          (d)  Sellers  shall  receive  credit  for  any  maintenance  or  other
     reserves,  ad valorem taxes and hazard insurance escrows held by any Lender
     of the Assumed Debt and such reserves and escrows shall be  transferred  to
     Purchaser.

          (e)  Sellers  shall  receive  a  credit  in an  amount  equal  to  all
     prepayment  penalties  and  premiums and all other  charges  imposed by any
     Lender  (other  than the  Andover  Street  Lender) in  connection  with the
     prepayment of the Existing Debt.

          (f) Each party shall be responsible for its own legal fees.


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          (g)  Purchaser  shall  be  responsible  for  the  cost  of  the  Title
     Commitments and any title insurance  premiums or costs and any endorsements
     thereto, the costs of the Surveys and the cost of recording the Deeds.

          (h) Transfer  taxes,  deed stamps or similar  conveyance fees shall be
     adjusted  such that  Purchaser and Sellers are each  responsible  for fifty
     percent (50%), except with respect to Properties located in Connecticut and
     Massachusetts  where Sellers shall be responsible  for all transfer  taxes,
     deeds stamps or similar conveyance fees.

     10.2  Reconciliations.  If any of the amounts to be apportioned  under this
Article 10 (a) were not  prorated  and  apportioned  at the  Closing  due to the
unavailability of the information necessary to compute such proration,  (b) were
prorated  or  apportioned  at the Closing  based upon  estimated  or  incomplete
information or (c) were based on any errors or omissions in computing prorations
which  errors or  omissions  are  discovered  subsequent  to the  Closing,  such
apportionments  shall be recalculated as soon as possible after the availability
of required  information,  and any overpayment or underpayment  due either party
shall be  adjusted  by suitable  payment of one to the other.  Unless  otherwise
specified herein, all such reimbursements shall be made on or before thirty (30)
days after  receipt of notice of the amount  due.  Any such  reimbursements  not
timely paid shall bear  interest at a per annum rate equal to ten percent  (10%)
from the due date until all such unpaid sums together with all interest  accrued
thereon is paid if payment is not made  within ten (10) days after  receipt of a
bill therefor.

     10.3 Survival.  Sellers'  obligations  under this Article shall survive the
Closing for a period of no longer than nine (9) months.  If with respect to real
estate taxes,  a final  reconciliation  cannot be made within nine (9) months of
Closing,  then  the  parties  shall  make a final  adjustment  based on the best
information available.

                       ARTICLE II. EXTENSION; TERMINATION

     The  following  provisions  shall  govern  the  extension,  termination  or
abandonment of this Agreement.

     11.1 Extension to Satisfy Conditions.  If on the Closing Date, Sellers have
not cured any Title  Objection  which Seller is obligated to cure or Sellers are
unable to make conveyance or to deliver possession of any of the Properties, all
as herein set forth, or any of the closing conditions listed in Section 4.1 have
not been  satisfied,  then,  Sellers shall use  reasonable  efforts to cure such
Title  Objection or make conveyance or otherwise  deliver  possession or satisfy
such  closing  conditions  as provided  herein,  and the  Closing  Date shall be
extended  for a period  not to exceed  ninety  (90) days;  provided  that in the
exercise of such  reasonable  efforts,  Sellers shall not be obligated to expend
more than Fifty Thousand


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Dollars ($50,000) in the aggregate for any one Property or Five Hundred Thousand
Dollars  ($500,000)  in the  aggregate  for all of the  Properties  unless  such
failure is  otherwise  a breach of a  representation  or  warranty  of Seller or
breach of an obligation  hereunder,  in which event, the dollar limitation shall
not be applicable and the exercise of reasonable  efforts shall not be deemed an
excuse for  non-performance.  In addition,  if on the Closing Date,  Sellers are
unable to cure any Title Objections which Sellers elect but are not obligated to
cure,  Sellers may elect, by written notice to Purchaser,  to extend the Closing
Date for a period  not to exceed  ninety  (90) days,  and in such event  Sellers
shall use  reasonable  efforts  to cure such  objection,  subject  to the dollar
limitations  set forth above.  If the time of Closing is extended as provided in
this Section and Sellers are able to cure all Title Objections,  make conveyance
and deliver  possession of the  Properties,  all as herein set forth and satisfy
such closing  conditions as provided herein within the extended period,  Sellers
may specify an earlier Closing Date upon ten (10) days notice to Purchaser.

     11.2.  Failure to Satisfy Closing  Conditions.  If (a) on the Closing Date,
there are Title  Objections  which Sellers are not obligated to cure and Sellers
have not  elected  to extend the  Closing  Date  under  Section  11.1 or (b) the
Closing  Date is extended  pursuant  to Section  11.1,  and, if on the  extended
Closing Date,  Sellers shall remain  unable to cure any Title  Objections  which
they  are  not  obligated  to cure or  make  conveyance,  or any of the  closing
conditions  listed in Section  4.1 have not been  satisfied,  then,  in any such
event, unless such failure is otherwise a breach of a representation or warranty
of Seller or the  failure  of Seller to perform an  obligation  hereunder,  this
Agreement shall  terminate  whereupon the Deposit shall be refunded to Purchaser
and all  obligations of the parties hereto shall cease and this Agreement  shall
be void and without recourse to the parties hereto, except as otherwise provided
herein  (e.g.  the rights of the parties set forth in Article  12),  unless,  in
either event,  Purchaser,  by written notice to Sellers exercised not later than
five (5) Business Days prior to the scheduled Closing Date, elects to waive such
title or survey  objection  or  condition  and  accept  title  under  prevailing
conditions without any reduction in the Purchase Price.

     11.3. Return of Materials. In the event of a termination of this Agreement,
then  Purchaser  shall  promptly  return  to  Sellers  all  materials  delivered
hereunder,  including,  without limitation,  the Due Diligence Materials and any
copies  thereof,   and  keep  confidential   (except  as  already  disclosed  to
Purchaser's  attorneys,  consultants  etc. in connection with conducting its due
diligence  hereunder)  any  proprietary  information  delivered  to Purchaser by
Sellers pursuant to this Agreement, except as otherwise provided in the Right of
Entry Agreement.

     11.4 Sellers'  Right to Terminate.  Notwithstanding  anything  contained in
this Agreement to the contrary, if prior to Closing, any person, entity or group
acquires or proposes to acquire (a) the Properties and all or substantially  all
of the remaining assets directly or indirectly owned by MGI or (b) by means of a
merger,  consolidation,  tender


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<PAGE>
                                                           New England Portfolio

offer,  exchange offer,  private or public market purchases or otherwise,  fifty
percent  (50%) or more of the  outstanding  common  stock of MGI (any such event
described in (a) or (b) a "Company  Event") and the Board of Trustees of MGI has
determined  to  pursue  such  Company  Event,  Sellers  shall  have the right to
terminate this Agreement upon delivery of written notice to Purchaser  whereupon
the Deposit  shall be refunded to Purchaser and all  obligations  of the parties
hereto shall cease and this Agreement shall be void and without  recourse to the
parties hereto (except those provisions which are expressly  intended to survive
such  termination).  MGI agrees to provide  Purchaser  with prompt notice of the
Board of Trustees'  determination  to pursue such Company Event involving any of
the Properties,  including, in such notice, the nature of such Company Event and
the parties known to MGI to be involved.  Purchaser shall keep  confidential all
communications  from  MGI  regarding  such  Company  Event.  If and only if this
Agreement is terminated by Sellers  pursuant to this Section,  Sellers shall pay
to Purchaser a break-up fee in the amount of Three Million Dollars  ($3,000,000)
(the "Break-Up  Fee") and shall  reimburse  Purchaser for all  reasonable  third
party  out-of-pocket costs incurred by Purchaser in connection with its proposed
purchase  of  the  Properties  including,   without  limitation,  fees  paid  to
prospective  lenders  or other  capital  sources  up to a maximum  amount of Two
Million Dollars  ($2,000,000) if such  termination  occurs during the Inspection
Period, or, in the alternative,  if such termination occurs after the end of the
Inspection  Period, up to a maximum amount of Four Million Dollars  ($4,000,000)
(in either case, the "Reimbursed  Costs").  Purchaser shall provide Sellers with
copies of paid  invoices or such other  evidence  satisfactory  to Sellers  with
respect to the  Reimbursed  Costs.  The Break-Up Fee and  Reimbursed  Costs,  if
earned,  shall be paid by Sellers to  Purchaser  no later than  thirty (30) days
after the  termination  of this  Agreement.  Payment of the  Break-Up  Fee,  the
Reimbursed  Costs  and the  return  of the  Deposit  shall be in the  nature  of
liquidated damages and Purchaser shall have no recourse to Sellers for any other
amount due and owing  under this  Agreement  or at law and equity as a result of
the termination of this  Agreement.  The parties agree that if this Agreement is
terminated pursuant to any other Section of this Agreement,  including,  without
limitation,  Sections  4.2,  4.4, 4.5 or 12.1,  Sellers  shall not be liable for
payment of the Break-Up Fee or Reimbursed Costs.

                              ARTICLE 12. DEFAULTS
                                          --------

     12.1.  Purchaser's Default. In the event of a material default by Purchaser
in the  performance  of any of the  terms of this  Agreement,  Sellers  shall be
entitled  to retain  the  Deposit  (which  shall  include  any  interest  earned
thereon), as liquidated damages, as Sellers' sole and exclusive remedy, it being
agreed  that  Sellers'  actual  damages  would be  difficult  or  impossible  to
ascertain in such event, and that such amount  constitutes a fair and reasonable
amount of damages under the  circumstances.  Thereafter,  this  Agreement  shall
become null and void,  and neither party shall have further  rights  against the
other,  except  for those  rights  specifically  stated  herein to  survive  the
termination or cancellation of this Agreement.


                                       31
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                                                           New England Portfolio


     12.2.  Sellers'  Default.  In the event of a material default by Sellers in
the performance of any of the  obligations of Sellers under this Agreement,  the
Deposit  shall be  returned  to  Purchaser  and  Purchaser  may, as its sole and
exclusive  remedy  at  law  and  equity,  seek  specific   performance  of  such
obligation, or in the event the remedy of specific performance is unavailable or
denied to  Purchaser,  be  reimbursed  by  Sellers  for all  costs and  expenses
incurred in connection with this transaction,  including without  limitation all
fees and expenses of third  parties,  financing  fees and deposits and the like,
and in  enforcing  its  remedies  hereunder;  provided  that in no  event  shall
Sellers'   liability  for  costs  and  expenses   exceed  Four  Million  Dollars
($4,000,000)  in the  aggregate.  In no event  shall  Sellers  be liable for any
punitive, direct, indirect or consequential damages.

                               ARTICLE 13. BROKERS
                                           -------

     13.1 No Brokers.  Sellers and Purchaser  mutually  represent and warrant to
the other that each has dealt with no broker or finder in  connection  with this
Agreement or the sale and purchase of the Properties other than Fallon,  Hines &
O'Connor,  Inc.  and Ernst & Young  (together,  the  "Broker")  and that neither
Sellers nor  Purchaser  knows of any broker or finder  other than Broker who has
claimed or may have a right to claim a commission  or other fee or  compensation
in connection  with this  Agreement or the sale and purchase of the  Properties.
The  commission  due  Broker  shall be paid by  Sellers  pursuant  to a separate
agreement to which  Purchaser is not a party subject to all terms and conditions
thereof and Sellers shall  indemnify and hold Purchaser  harmless from any claim
for a commission,  fee or other  compensation  by Broker.  Sellers and Purchaser
agree  that  Purchaser  shall  be  solely  responsible  for  any  claims  for  a
commission,  fee or other  compensation  by any  broker  or  finder  engaged  by
Purchaser  in  connection  with this  Agreement  or the sale and purchase of the
Properties.  Sellers  and  Purchaser  agree to  indemnify  and  defend the other
against any claims, costs or expenses (including  reasonable attorneys' fees and
disbursements)  arising out of the breach,  on their  respective  parts,  of any
representations,  warranties  or  agreements  contained  in  this  Section.  The
representations and obligations under this Section shall survive the Closing or,
if the  Closing  does  not  occur,  the  termination  or  cancellation  of  this
Agreement.

                               ARTICLE 14. NOTICES
                                           -------

     14.1 Notices. Any notice,  request or demand which, under the provisions of
this  Agreement or otherwise,  must or may be given or made by any party hereto,
shall be in writing,  and shall be sent by (a)  registered  or  certified  mail,
return  receipt  requested,  with postage  prepaid,  (b) express mail or courier
(next day delivery), or (c) personal delivery (receipt acknowledged in writing),
or (d) via facsimile, addressed as follows:

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<PAGE>
                                                           New England Portfolio

           If to Sellers:

                       MGI Properties
                       One Winthrop Square
                       Boston, Massachusetts 02110
                       Attention: Karl W. Weller, Senior Vice President
                       FAX (617) 422-6010

           with a copy to:

                       Goodwin, Procter & Hoar LLP
                       Exchange Place
                       Boston, Massachusetts 02109
                       Attention: Michael H. Glazer, P.C.
                       FAX (617) 227-8591

           If to Purchaser:

                       Boston Capital Institutional Advisors LLC
                       One Boston Place
                       Boston, MA 02108-4406
                       Attention: Samuel T. Byrne
                       FAX (617) 624-8999

           with a copy to:

                       Goulston & Storrs, P.C.
                       400 Atlantic Avenue
                       Boston, MA 02110-3333
                       Attention:  Jordan P. Krasnow, Esq.
                       FAX (617) 574-6595


Either party may  designate by notice in writing a new or other address to which
such notice or demand shall thereafter be so given,  made or mailed.  Any notice
given  hereunder by mail shall be deemed  delivered  (i) two (2)  Business  Days
after it is deposited in a United  States post office,  enclosed in a registered
or certified,  prepaid envelope, addressed as hereinbefore provided, or (ii) the
date it is sent if sent by fax, express mail, courier or personal delivery.



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                           ARTICLE 15. MISCELLANEOUS
                                       -------------

     15.1  Amendments.  This Agreement shall not be altered,  amended,  changed,
waived, terminated or otherwise modified in any respect or particular unless the
same shall be in  writing  and signed by or on behalf of the party to be charged
therewith.

     15.2  Governing  Law;  Waiver  of Trial By Jury.  This  Agreement  shall be
interpreted  and enforced in  accordance  with the laws of the  Commonwealth  of
Massachusetts.  Each of Purchaser and Sellers agree to submit to jurisdiction in
the Commonwealth of  Massachusetts  with respect to any dispute under or arising
out of this Agreement and agree that any such dispute shall be brought either in
the courts of the  Commonwealth of  Massachusetts  or in the applicable  federal
district  court located in  Massachusetts.  If any  provisions of this Agreement
shall be  unenforceable  or  invalid,  the same shall not  affect the  remaining
provisions of this  Agreement and to this end the  provisions of this  Agreement
are intended to be and shall be  severable.  Purchaser  and Sellers  hereby each
waive trial by jury in any action,  proceeding or counterclaim brought by either
against the other, on or in respect of any matter  whatsoever  arising out of or
in any way connected  with this Agreement or the  relationship  of Purchaser and
Sellers.

     15.3  Limitations on  Assignability.  This Agreement may not be assigned by
Purchaser  without the prior  written  consent of Sellers,  in Sellers' sole and
absolute discretion, and any purported assignment in violation of this provision
shall  be null and  void.  Notwithstanding  the  foregoing,  Purchaser  shall be
permitted to assign this Agreement to one or more affiliated  entities,  each of
which  is  controlled  by  Purchaser  or  the   principals  of  Boston   Capital
Institutional  Advisors,  provided (a) Purchaser  effectuates such assignment in
writing  prior to the Closing,  (b) each  assignee  assumes the  obligations  of
Purchaser under the terms of this Agreement, and (c) Purchaser remains liable to
Seller under the terms of this  Agreement.  This Agreement shall be binding upon
and shall  inure to the benefit of the  parties  hereto and to their  respective
heirs, executors, administrators, successors and permitted assigns.

     15.4  Waivers.  No failure or delay of either  party in the exercise of any
right given to such party  hereunder or the waiver by any party of any condition
hereunder  for its  benefit  shall  constitute  a waiver of any other or further
right or  condition  nor  shall  any  single or  partial  exercise  of any right
preclude other or further exercise thereof or any other right. The waiver of any
breach  hereunder  shall  not be  deemed  to be a  waiver  of any  other  or any
subsequent breach hereof.

     15.5 Exhibits.  Each of the Exhibits referred to herein is attached hereto,
made a part hereof and is  incorporated  in this  Agreement by this reference as
though fully set forth herein. During the fourteen (14) day period following the
date of this  Agreement,  Sellers


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                                                           New England Portfolio

shall have the right to update the Exhibits  attached to this Agreement in order
to provide additional information that becomes known to Sellers,  including, but
not limited to, the addition of license  agreements  affecting the Properties to
Exhibit  E.  Purchaser  acknowledges  and  agrees  that  Sellers  have  informed
Purchaser that notwithstanding the provisions of Section 8.2(f),  Exhibit E does
not list all of the license agreements affecting the Properties.

     15.6  Section  Headings.  The section  headings in this  Agreement  are for
convenience  only and are not intended to be a part of this  Agreement and shall
not be  construed  to modify,  explain or alter any of the terms,  covenants  or
conditions herein contained.

     15.7 Recording and Binding Effect.  This Agreement shall not be recorded or
registered  by  or  for  the  benefit  of  Purchaser  and  any   recordation  or
registration  by or for the benefit of Purchaser  hereof shall be void and shall
constitute a default by Purchaser hereunder. The submission of this document for
examination and negotiation does not constitute an offer to sell or an option to
buy the  Properties  and this document  shall become  effective and binding only
upon the execution and delivery by Sellers and Purchaser.

     15.8  Counterparts.   This  Agreement  may  be  executed  in  one  or  more
counterparts,  each of which when so executed and  delivered  shall be deemed an
original,  but all of which taken together shall constitute but one and the same
instrument. All signatures need not appear on any single counterpart.

     15.9  Relationship  of Parties.  It is the  intention of this  Agreement to
create the  relationship  of seller and buyer between the parties  hereto and no
other relationship  whatsoever,  and nothing herein contained shall be construed
to make the parties  hereto  partners or joint  venturers,  or to render  either
party liable for any of the debts or obligations  of the other party.  No broker
or finder (including,  without limitation,  Broker), mortgagee, partner or other
person or entity not a party to this  Agreement is intended,  or shall be deemed
to be, a third-party beneficiary of this Agreement.

     15.10  Business Day. A Business Day shall be any day other than a Saturday,
Sunday,  official  Federal  holiday  or legal  holiday  in the  Commonwealth  of
Massachusetts. If any payment to be made or obligation to be performed hereunder
is to be made or  performed  on a day other  than a  Business  Day,  it shall be
deemed to be made or performed in a timely manner if done on the next succeeding
Business Day.

     15.11 Time of the Essence. It is agreed that time is of the essence of this
Agreement.


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<PAGE>
                                                           New England Portfolio

     15.12   Confidentiality;   Publicity.   Purchaser   acknowledges  that  any
information  furnished to Purchaser  with respect to the  Properties  is and has
been so furnished on the condition that Purchaser  maintain the  confidentiality
thereof.  Accordingly,  Purchaser  shall hold,  and shall  cause its  directors,
officers and other personnel and  representatives to hold, in strict confidence,
and not disclose to any other person without the prior written consent of Seller
until the Closing shall have been consummated, any of the information in respect
of any of the Properties  delivered to or for the benefit of Purchaser by Seller
or  any  of  its  agents,  representatives  or  employees,   including,  without
limitation,  the  Broker.  In the  event  the  Closing  does not  occur and this
Agreement is terminated, Purchaser shall promptly return to Seller all copies of
documents  containing any of such information without retaining any copy thereof
or extract therefrom.  Notwithstanding  anything to the contrary hereinabove set
forth,  both parties may disclose such  information on a  need-to-know  basis to
their respective agents, employees,  members of professional firms serving it or
lenders to the extent reasonably necessary to perform due diligence and complete
the transaction  contemplated hereby; provided that all such parties shall agree
to keep such information  strictly  confidential in accordance with the terms of
this  Section  15.12.  Prior to the  Closing,  without  the consent of the other
party,  neither  party  shall (a)  disclose  the terms  and  provisions  of this
Agreement,  (b) the fact that negotiations with respect to the matters described
herein have taken place, or (c) the terms and provisions of documents  delivered
to the other party in  connection  with this  transaction,  except to the extent
such  disclosure  is (i) required by Law,  including,  without  limitation,  any
securities  laws,  any  reporting  requirement  or any  accounting  or  auditing
standard, (ii) required to enforce the provisions of this Agreement, or (iii) is
of a matter which has become public through no fault of the party who thereafter
discloses  such  matter.  Notwithstanding  anything  to the  contrary  contained
herein, while Sellers shall consult with Purchaser and use reasonable efforts to
reach mutual agreement with Purchaser  regarding public  announcements,  Sellers
shall have the sole right to determine the form, timing and substance of, and to
issue, all publicity (including, without limitation, SEC filings) concerning the
transaction contemplated by this Agreement, which may include publicity or other
announcements  at any time on or after  the  execution  of this  Agreement.  The
provisions  of this  Section  15.12  shall  survive  the  expiration  or earlier
termination of this Agreement.

     15.13 Survival.  Unless otherwise expressly stated in this Agreement,  none
of the  warranties,  representations  and covenants of Seller or Purchaser shall
survive  the  delivery  of the deed and  other  closing  documents  by Seller to
Purchaser.  The acceptance of a deed by Purchaser (or Purchaser's nominee) shall
be deemed full performance and shall discharge every agreement and obligation of
Sellers herein  contained except any agreements which by their express terms are
to be performed after the Closing Date.

     15.14 Limitation of Liability. MGI is a Massachusetts trust and all persons
dealing with MGI must look solely to the property of MGI for the  enforcement of
any claims against

                                       36
<PAGE>
                                                           New England Portfolio

MGI. Neither the trustees,  officers,  agents nor shareholders of MGI assume any
personal liability for obligations entered into on its behalf. In no event shall
Purchaser  seek or  attempt to obtain  any  recovery  or  judgment  against  any
trustee, officer, director, employee or shareholder of any Seller or against MGI
or any trustee, officer, director, employee or shareholder of MGI.


                                       37
<PAGE>
                                                           New England Portfolio


            IN WITNESS WHEREOF,  the parties hereto have executed this Agreement
on the day and year first above written.


                                        SELLERS:

                                        MGI  Properties,  for itself and as duly
                                        authorized  agent  for each of the named
                                        Sellers  as  set  forth  on  Schedule  1
                                        attached hereto.



                                        By: /s/ Karl W. Weller
                                            -----------------------------------
                                            Name:  Karl W. Weller
                                            Title: Senior Vice President

                                        PURCHASER:

                                        BCIA Funding Corp.



                                        By: /s/ William H. Kremer
                                            -----------------------------------
                                            Name:  William H. Kremer
                                            Title: Managing Director




                                       38
<PAGE>
                                                           New England Portfolio

                                   SCHEDULE 1
                                   ----------
                               Identity of Sellers
                               -------------------

MGI Winthrop Associates, Inc.
MGI Ten Winthrop Square, Inc.
MGI One Portland Square, Inc.
MGI Two Portland Square, Inc.
MGI Elm Street, Inc.
MGI 33 Broad Street, Inc.

+MGI Glastonbury Corp.
MGI Crosby Drive, Inc.
MGI Chelmsford Corp.
MGI Point West Corp.
6 TSC, Inc.
15 TSC, Inc.
410 Amherst Street, Inc.
MGI Bulfinch Drive, Inc.
MGI 8 Forge Park, Inc.
MGI 9 Forge Park, Inc.
MGI 15 Forge Park, Inc.
MGI 261 Cedar Hill Street, Inc.
MGI Forest Street, Inc.
MGI Harvard Street Corp.
MGI 234 Ballardvale Street, Inc.
MGI Ballardvale Corp.
MGI Research Drive Corp.
MGI 5 Wentworth Drive, Inc.
472 Amherst Street, Inc.
22 Cotton Road, Inc.
MGI One Tech Andover Corp.
MGI Andover Corp.
MGI Tech Center Corp.
MGI 175 Paramount Drive, Inc.
MGI 375 Paramount Drive, Inc.
MGI Riverside Drive, Inc.
MGI 805 Middle Corp.
MGI Federal Street, Inc.
MGI Two Federal Street, Inc.
MGI Five Federal Street, Inc.
MGI Billerica Road, Inc.
MGI 25 Porter Road, Inc.
MGI One Park West, Inc.
MGI Andover Street, Inc.
MGI Robbins Road, Inc.
MGI GLAS Two Corp.


                                       39

                    AMENDMENT TO PURCHASE AND SALE AGREEMENT
                    ----------------------------------------


     THIS AMENDMENT TO PURCHASE AND SALE AGREEMENT (this "Amendment") is entered
into as of this 28th day of March, 1999 , by and between MGI PROPERTIES, a trust
organized  and  existing  under the laws of the  Commonwealth  of  Massachusetts
("MGI")  for  itself  and as agent for each of the  entities  more  particularly
described  on  Schedule  1  attached  hereto  (MGI  and  each  such  entity  are
collectively, the "Sellers") and BCIA FUNDING CORP., a Massachusetts corporation
("Purchaser").

                                    RECITALS
                                    --------

A.   Reference is made to a certain  Purchase and Sale  Agreement by and between
MGI,  for  itself  and as  agent  for  each of the  entities  more  particularly
described  on Schedule 1 attached  hereto,  as the  "Sellers"  and BCIA  Funding
Corp., as "Purchaser," dated as of March 12, 1999. (the "P&S Agreement").

B.   Purchaser  has  requested  certain  extensions  of certain time periods set
forth  in the P&S  Agreement  and the  Sellers  are  willing  to  amend  the P&S
Agreement subject to the terms and provisions set forth below.


                                    AGREEMENT
                                    ---------

     NOW  THEREFORE,  in  consideration  of the  foregoing  and  other  good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, Seller and Purchaser hereby agree as follows:

1.   RECITALS;  CAPITALIZED  TERMS.  All  of  the  foregoing  Recitals  to  this
Amendment are true and correct and are hereby incorporated in and made a part of
this  Amendment  to the  same  extent  as if  herein  set  forth  in  full.  All
capitalized  terms not otherwise  modified or defined herein shall have the same
respective meanings ascribed to them in the P&S Agreement.

2.   EXTENSION OF INSPECTION  PERIOD.  The  expiration  date for the  Inspection
Period is hereby extended until 5:00 p.m. Boston time on May 5, 1999.

3.   EXTENSION  CLOSING  DATE.  The date set  forth  in  Section  3.1 of the P&S
Agreement for the Closing is hereby changed from June 1, 1999 to June 30, 1999.

4.   TENANT ESTOPPEL CERTIFICATES. Section 4.1(d) of the P&S Agreement is hereby
amended by deleting the text in the first seven lines on page 9,  beginning with
the  words  "Notwithstanding  the  above,"  through  and  ending  with the

<PAGE>
words "necessary to satisfy such  requirement;" and replacing such text with the
following  in lieu  thereof:

          "Notwithstanding  the above, in the event Seller cannot for any reason
          obtain estoppel certificates from all of the tenants needed to satisfy
          the   foregoing   requirements   for  single   tenant   buildings   or
          multi-tenanted  buildings,  Seller,  at its  option,  may  satisfy the
          eighty  percent  (80%)   requirement  set  forth  in  (ii)  above  for
          multi-tenanted  buildings  and/or the  requirement  for single  tenant
          buildings  set forth in (i) above by  delivering  one or more estoppel
          certificates from Seller as to the matters set forth in Exhibit D with
          respect to one or more of the  remaining  Leases of such  buildings as
          are necessary to satisfy such requirement"

5.   GENERAL PROVISIONS.

(a)  Except as set forth in this Amendment, the P&S Agreement remains unmodified
and in full force and effect.

(b)  This Amendment  shall be governed and construed in accordance with the laws
of the  Commonwealth of  Massachusetts.  This Amendment shall run to, be binding
upon,  and inure to the  benefit of all  successors  and  assigns of the parties
hereto.  The captions used in this Amendment are for  convenience  only, and are
not part of this  Amendment  and do not limit,  describe  or amplify  the terms,
provisions or scope of this Amendment.  Each party hereto agrees to execute such
documents and take such acts as any other party hereto may reasonably request to
further effectuate the amendments and transactions contemplated hereby.

(c)  This Amendment may be executed in one or more  counterparts,  each of which
counterpart  when  executed and delivered  shall be deemed an original,  binding
upon  all of the  parties  hereto,  notwithstanding  that  each of them is not a
signatory to the same counterpart and all of which  counterparts taken together,
shall  constitute  one and the same  instrument.  It shall not be  necessary  in
making  proof of this  Amendment  to produce  or account  for more than one such
counterpart. Each party hereto represents and warrants that it has all requisite
power and  authority to execute and deliver this  Amendment  and that the person
executing  the  Amendment  on its  behalf is duly  authorized  to  execute  this
Amendment on such party's behalf.

                                       2
<PAGE>
     Executed as an instrument  under seal as of the date and year first written
above.


                                        SELLERS:

                                        MGI Properties, for itself and as duly
                                        authorized agent for each of the named
                                        Sellers



                                        By:/s/ Karl W. Weller
                                           -------------------------------------
                                           Karl W. Weller
                                           Senior Vice President

                                        PURCHASER:


                                        BCIA Funding Corp.



                                        By:/s/ William H. Kremer
                                           -------------------------------------
                                           William H. Kremer
                                            Managing Director

                                       3

<PAGE>
                                   SCHEDULE 1

                               Identity of Sellers
                               -------------------

MGI Winthrop Associates, Inc.
MGI Ten Winthrop Square, Inc.
MGI One Portland Square, Inc.
MGI Two Portland Square, Inc.
MGI Elm Street, Inc.
MGI 33 Broad Street, Inc.
MGI Glastonbury Corp.
MGI Crosby Drive, Inc.
MGI Chelmsford Corp.
MGI Point West Corp.
6 TSC, Inc.
15 TSC, Inc.
410 Amherst Street, Inc.
MGI Bulfinch Drive, Inc.
MGI 8 Forge Park, Inc.
MGI 9 Forge Park, Inc.
MGI 15 Forge Park, Inc.
MGI 261 Cedar Hill Street, Inc.
MGI Forest Street, Inc.
MGI Harvard Street Corp.
MGI 234 Ballardvale Street, Inc.
MGI Ballardvale Corp.
MGI Research Drive Corp.
MGI 5 Wentworth Drive, Inc.
472 Amherst Street, Inc.
22 Cotton Road, Inc.
MGI One Tech Andover Corp.
MGI Andover Corp.
MGI Tech Center Corp.
MGI 175 Paramount Drive, Inc.
MGI 375 Paramount Drive, Inc.
MGI Riverside Drive, Inc.
MGI 805 Middle Corp.
MGI Federal Street, Inc.
MGI Two Federal Street, Inc.
MGI Five Federal Street, Inc.
MGI Billerica Road, Inc.
MGI 25 Porter Road, Inc.
MGI One Park West, Inc.
MGI Andover Street, Inc.
MGI Robbins Road, Inc.
MGI GLAS Two Corp.


                 SECOND AMENDMENT TO PURCHASE AND SALE AGREEMENT
                 -----------------------------------------------


     THIS SECOND AMENDMENT TO PURCHASE AND SALE AGREEMENT (this  "Amendment") is
entered into as of the 5th day of May,  1999, by and between MGI  PROPERTIES,  a
trust organized and existing under the laws of the Commonwealth of Massachusetts
("MGI")  for  itself  and as agent for each of the  entities  more  particularly
described  on  Schedule  1  attached  hereto  (MGI  and  each  such  entity  are
collectively, the "Sellers") and BCIA FUNDING CORP., a Massachusetts corporation
("Purchaser").

                                    RECITALS
                                    --------

A.   Reference is made to a certain  Purchase and Sale  Agreement by and between
Sellers as the "Sellers" and Purchaser as the "Purchaser," dated as of March 12,
1999 (the "Original P&S Agreement").

B.   The Original P&S Agreement  was amended by a certain  Amendment to Purchase
and Sale Agreement,  dated as of March 28, 1999,  provided,  however,  that such
date was a scrivener's  error,  and such Amendment was actually  entered into on
April 28, 1999 (the "First Amendment").  The Original P&S Agreement,  as amended
by the First Amendment, shall be referred to herein as the "P&S Agreement."

C.   The parties wish to  memorialize  certain  events which have taken place to
date with respect to the  transaction  contemplated  by the P&S Agreement and to
provide for certain additional terms as more particularly set forth herein.

                                    AGREEMENT
                                    ---------

     NOW  THEREFORE,  in  consideration  of the  foregoing  and  other  good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, Sellers and Purchaser hereby agree as follows:

1.   RECITALS;  Capitalized  Terms.  All  of  the  foregoing  Recitals  to  this
Amendment are true and correct and are hereby incorporated in and made a part of
this  Amendment  to the  same  extent  as if  herein  set  forth  in  full.  All
capitalized  terms not otherwise  modified or defined herein shall have the same
respective meanings ascribed to them in the P&S Agreement.

2.   PURCHASER'S  SATISFACTION OF DUE DILIGENCE.  The parties hereby acknowledge
that  the  execution  and  delivery  of  this  Agreement  by the  parties  shall
constitute delivery of Purchaser's written notice to Sellers of its approval and
unconditional waiver of the conditions set forth in Subsection 4.2.(a)(i) of the
P&S Agreement. Simultaneously with the
<PAGE>

execution and delivery of this Amendment, Purchaser shall deliver the Additional
Deposit in accordance with the terms of the P&S Agreement.

3.   PURCHASE  PRICE.  The Purchase  Price is hereby reduced by Six Million Four
Hundred Fifty Eight Thousand Two Hundred and Ninety One Dollars  ($6,458,291) to
Four Hundred  Three  Million Five Hundred  Forty One Thousand  Seven Hundred and
Nine Dollars  ($403,541,709).  Seller hereby  reserves all rights to all claims,
causes of action,  remedies and damages that Seller may have against Navisite or
any of its affiliates with respect to such lease for the Property located at Two
Andover Tech Center and  Purchaser  hereby  acknowledges  such  reservation  and
releases all right,  title and  interest in any such  claims,  causes of action,
remedies and damages that it may have.  The parties  acknowledge  and agree that
Three  Million Five Hundred Sixty  Thousand  Dollars  ($3,560,000)  of the price
reduction set forth above is  attributable to the loss of rental income from the
anticipated  lease with  Navisite for the  Property  located at Two Andover Tech
Center.

4.   TENANT  ESTOPPEL  CERTIFICATES.  Purchaser  hereby  acknowledges  that  the
condition to Purchaser's  obligations  to close  contained in Section 4.1(d) has
been satisfied or waived by Purchaser.  Notwithstanding  the  foregoing,  Seller
agrees that Purchaser  shall receive a credit against the Purchase Price for the
each of the amounts set forth below with respect to issues raised by the tenants
listed  below,  provided  however,  that the amount of such credit  shall be (i)
reduced by any amounts  expended by Sellers to address the issues raised by such
tenants, as evidenced to Purchaser's reasonable satisfaction, or (ii) reduced to
zero if Seller provides a "clean"  estoppel from tenant which does not raise the
issue giving rise to such credit.

Tenant                      Property                  Maximum Credit Amount
- --------------------------------------------------------------------------------
Cambridge Associates              One Winthrop Square       $15,885
Dean Witter Reynolds, Inc.        1155 Elm Street           $37,960
Smith Barney, Inc.                1155 Elm Street           $ 5,000
Fleet                             1155 Elm Street           $ 5,000(*)
Seaboard Internat'l               22 Cotton Road            $ 2,500
Biscom                            321 Billerica Rd.         $ 5,300
Sudan                             Two Portland              $ 1,300

5.   SERVICE  CONTRACTS.  Purchaser hereby  acknowledges and agrees that, except
for the property management contracts (which are addressed in Section 6 hereof),


- --------------
(*)  This  amount is on account of  potentially  disputed  CAM  charges and real
     estate taxes for years prior to 1999 and shall be paid in lieu of any other
     adjustment  for years prior to 1999.  Seller  shall  assign to Purchaser at
     Closing any claims it has against 1155 Elm Street LLC, Seller's predecessor
     in title, regarding any such disputed claims for years prior to 1998.

                                        2
<PAGE>
Purchaser has not requested  Sellers to terminate any of the
Service Contracts, including, without limitation, all of the service, equipment,
supply,  or  maintenance  agreements  delivered  or made  available to Purchaser
during the Inspection Period. Accordingly all such contracts shall be assumed by
Purchaser at Closing and shall  constitute  Assumed Service  Contracts under the
P&S  Agreement.  During the remaining term of this  Agreement,  Seller shall not
enter into any new service  contract nor any amendments of or  modifications  to
the existing Service  Contracts (each a "New Service  Contract") with respect to
the  Properties  which is not  terminable  at Closing  without the prior written
consent of Purchaser, which consent shall not be unreasonably withheld and which
shall be deemed  granted if Purchaser does not respond within three (3) Business
Days after  delivery  of any  written  request  for  consent  setting  forth the
business  terms of the  proposed  service  contract  or  enclosing a copy of the
proposed  service  contract.  All such New  Service  Contracts  which  have been
consented to or deemed consented to shall constitute  Assumed Service  Contracts
under the P&S Contract.

6.   PROPERTY MANAGEMENT  CONTRACTS.  Without limiting any other term of the P&S
Agreement or of this Amendment,  Purchaser acknowledges that it has received and
reviewed  all of the  property  management  contracts  currently  in effect with
respect to the Properties.

    (a)   Seller agrees that it shall terminate all existing property management
contracts between any Seller and MGI Property Management, Inc.

    (b)  Purchaser   acknowledges  and  agrees  that  the  property  management
contract between MGI Portland Management Company, a Maine corporation ("Portland
Management  Co.") and One Portland  Square  Condominium  Association  ("Portland
Square  Management  Contract")  shall not be terminated prior to the Closing and
that at Purchaser's  option to be exercised not less than ten (10) Business Days
prior to the Closing, Sellers shall transfer to Purchaser all of the outstanding
stock in Portland  Management  Co. free and clear of any liens or  encumbrances.
Sellers  represent  and warrant to  Purchaser  that there are no other assets or
liabilities  of  Portland  Management  Co.  other than the  Portland  Management
Contract and personal  property  and vendor  contracts  entered into by Portland
Management Co. in the satisfaction of its obligations  under the Portland Square
Management Contract and that to Seller's knowledge,  there are no defaults under
the Portland Square Management Contract.

     (c)  The  parties  acknowledge  and  agree  that  the  property  management
contracts  with  unaffiliated  third  parties  for  (i)  all  three  (3)  of the
Properties located in Forge Park, Franklin, Massachusetts and (ii) all three (3)
of the Properties  located in Connecticut  shall be terminated as of the Closing
Date. All three of the property  management  contracts for Properties located on
Southborough  Drive in South Portland,  Maine shall not be terminated by Sellers
prior  to  Closing  and  shall  constitute  "Assumed  Contracts"  under  the P&S
Agreement.

7.   NEW LEASES.  Purchaser hereby  acknowledges and agrees that it has received
and  consented  or deemed to have  consented  to each of the Leases set forth on
Exhibit A attached hereto,  all of which constitute  "Approved Leases" under the
P&S Agreement.

                                       3
<PAGE>

8. CONSTRUCTION  CONTRACTS AND NEW LEASE COSTS. Attached hereto as Exhibit C are
addenda  to  Exhibit R and  Exhibit  L to the P&S  Agreement,  which are  hereby
incorporated in and become a part of Exhibit R and Exhibit L, respectively under
the P&S Agreement for all purposes.

9.   POLAND SPRINGS LEASE  TRANSACTION.  With respect to the Property located at
375 Paramount  Drive,  Raynham,  Massachusetts  ("375  Paramount"),  the parties
acknowledge  that Sellers are currently  negotiating a lease with Poland Springs
Corporation and that it will be a condition of such lease that Sellers acquire a
certain one acre parcel  located  adjacent to 375  Paramount.  Sellers shall not
enter into a purchase  and sale  agreement  for such  adjacent  land without the
consent of  Purchaser,  which  consent  shall not be  unreasonably  withheld  or
delayed.  If prior to the Closing,  Sellers have entered into such  purchase and
sale agreement,  then at the Closing,  Purchaser shall reimburse Sellers for all
third party costs and expenses reasonably incurred by Sellers in connection with
such purchase,  including,  without limitation, all deposits, the purchase price
paid if the  adjacent  land is acquired  prior to the  Closing,  all  diligence,
engineering  and legal costs and shall  assume all other  costs and  expenses in
connection  with such purchase  which Sellers have  incurred.  In any event,  at
Closing  Purchaser  shall  reimburse  Sellers for any and all costs and expenses
incurred with respect to such transaction for which Purchaser has provided prior
approval.  If the  acquisition  of such  adjacent  land  has not  closed  by the
Closing,  Sellers shall assign its rights and obligations under the purchase and
sale  agreement to Purchaser  and  Purchaser  shall  assume all  obligations  of
Sellers  thereunder.  If the adjacent parcel is acquired by Sellers prior to the
Closing,  Sellers  shall convey such  adjacent  land to Purchaser at the Closing
subject to only those liens and  encumbrance  (other than mortgage  liens) which
existed at the time of Sellers' acquisition of such parcel.

10.  SPRINT  LEASE.  Seller  is  currently   negotiating  a  lease  with  Sprint
Communications  Company  LP  for  the  Property  located  at  1155  Elm  Street,
Manchester,  New  Hampshire.  For  purposes  of Section  10.1(c)(ii)  of the P&S
Agreement,  the effective date of such lease shall be deemed to be after June 1,
1999 notwithstanding that the actual effective date may be prior thereto.

11.  MGI LEASE.  Attached hereto as EXHIBIT B is a term sheet for MGI's existing
space in the property located at One Winthrop Square, Boston, Massachusetts. The
term sheet is hereby modified with respect to the term of the lease, which shall
be for eighteen (18) months, with MGI having the right to terminate the lease at
any time upon six (6) months prior written notice, and the amount of rent, which
shall be $35 per square foot for the first twelve (12) months and $38 per square
foot for the last six (6)  months;  provided,  however,  the rent for the  1,000
square feet of storage space shall be $12.50 per square foot.  The parties shall
in good faith negotiate a definitive  lease agreement based upon such term sheet
as modified  in this  Section 13 and using  MGI's  existing  form lease for such
Property within  twenty-one  (21) days after the date of this Agreement.  At the
Closing, such lease shall be executed and delivered by Purchaser as the landlord
and MGI as the tenant.

                                       4
<PAGE>

12.  MGI OPTION  PARCEL INC. At the  Closing,  MGI, as agent for or on behalf of
MGI Option  Parcel  Inc.("MGI  Option"),  shall assign to  Purchaser  all of MGI
Option's rights to acquire land in Hopkinton,  Massachusetts and Portland, Maine
to  the  extent  assignable,  without  any  representation  or  warranty  or  at
Purchaser's option to be exercised not less than ten (10) Business Days prior to
the Closing, Sellers shall transfer to Purchaser all of the outstanding stock of
MGI Option free and clear of any liens or  encumbrances.  Sellers  represent and
warrant to Purchaser that MGI owns the stock of MGI Option free and clear of any
liens or  encumbrances  and that to  Seller's  knowledge,  there are no defaults
under the  agreements  pursuant to which MGI Option holds rights to acquire land
in Hopkinton, Massachusetts and Portland, Maine.

13.  HEXALON PARKING  AGREEMENT.  Seller hereby agrees to assign,  and Purchaser
hereby  agrees to assume,  all of  Seller's  rights and  obligations  under that
certain  agreement  entitled  "Monthly  Parking  Agreement,"  dated June 1, 1993
between  Hexalon Real Estate,  Inc. and MGI Winthrop  Associates,  Inc.,  to the
extent assignable, without any representation or warranty.

14.  EXHIBIT  E - LEASES.  Attached  hereto  as  Exhibit D is a true,  complete,
correct and current copy of the List of Leases and the List of Licenses attached
to the P&S as Exhibit E which is hereby  substituted  for the List of Leases and
the List of Licenses previously attached to the P&S Agreement.

15.  GENERAL PROVISIONS.

a)   Except as set forth in this Amendment, the P&S Agreement remains unmodified
and in full force and effect.

b)   This Amendment  shall be governed and construed in accordance with the laws
of the  Commonwealth of  Massachusetts.  This Amendment shall run to, be binding
upon,  and inure to the  benefit of all  successors  and  assigns of the parties
hereto.  The captions used in this Amendment are for  convenience  only, and are
not part of this  Amendment  and do not limit,  describe  or amplify  the terms,
provisions or scope of this Amendment.  Each party hereto agrees to execute such
documents and take such acts as any other party hereto may reasonably request to
further effectuate the amendments and transactions contemplated hereby.

c)   This Amendment may be executed in one or more  counterparts,  each of which
counterpart  when  executed and delivered  shall be deemed an original,  binding
upon  all of the  parties  hereto,  notwithstanding  that  each of them is not a
signatory to the same counterpart and all of which  counterparts taken together,
shall  constitute  one and the same  instrument.  It shall not be  necessary  in
making  proof of this  Amendment  to produce  or account  for more than one such
counterpart. Each party hereto represents and warrants that it has all requisite
power and  authority to execute and deliver this  Amendment  and that the person
executing  the  Amendment  on its  behalf is duly  authorized  to  execute  this
Amendment on such party's behalf.



                                       5
<PAGE>

     Executed as an instrument  under seal as of the date and year first written
above.



                                          SELLERS:

                                          MGI Properties, for itself and as duly
                                          authorized agent for each of the named
                                          Sellers



                                          By: /s/ Karl W. Weller
                                             -----------------------------------
                                             Karl W. Weller
                                             Senior Vice President

                                          PURCHASER:

                                          BCIA Funding Corp.



                                          By: /s/William H. Kremer
                                             -----------------------------------
                                             William H. Kremer
                                             Managing Director


                                       6
<PAGE>

                                   SCHEDULE 1

                               Identity of Sellers
                               -------------------

MGI Winthrop Associates, Inc.
MGI Ten Winthrop Square, Inc.
MGI One Portland Square, Inc.
MGI Two Portland Square, Inc.
MGI Elm Street, Inc.
MGI 33 Broad Street, Inc.
MGI Glastonbury Corp.
MGI Crosby Drive, Inc.
MGI Chelmsford Corp.
MGI Point West Corp.
6 TSC, Inc.
15 TSC, Inc.
410 Amherst Street, Inc.
MGI Bulfinch Drive, Inc.
MGI 8 Forge Park, Inc.
MGI 9 Forge Park, Inc.
MGI 15 Forge Park, Inc.
MGI 261 Cedar Hill Street, Inc.
MGI Forest Street, Inc.
MGI Harvard Street Corp.
MGI 234 Ballardvale Street, Inc.
MGI Ballardvale Corp.
MGI Research Drive Corp.
MGI 5 Wentworth Drive, Inc.
472 Amherst Street, Inc.
22 Cotton Road, Inc.
MGI One Tech Andover Corp.
MGI Andover Corp.
MGI Tech Center Corp.
MGI 175 Paramount Drive, Inc.
MGI 375 Paramount Drive, Inc.
MGI Riverside Drive, Inc.
MGI 805 Middle Corp.
MGI Federal Street, Inc.
MGI Two Federal Street, Inc.
MGI Five Federal Street, Inc.
MGI Billerica Road, Inc.
MGI 25 Porter Road, Inc.
MGI One Park West, Inc.
MGI Andover Street, Inc.
MGI Robbins Road, Inc.
MGI GLAS Two Corp.




                                       7



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