<PAGE>
 
                                                                       EXHIBIT 1





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                                RIGHTS AGREEMENT

                                    between

                             CABOT INDUSTRIAL TRUST

                                      and

                                BANKBOSTON, N.A.

                                  Rights Agent

                         Dated as of June 11, 1998, and
                 Amended and Restated as of September 10, 1998



--------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
                               =================
<TABLE>
<CAPTION>
                                                                                 Page
                                                                                 ----
<S>         <C>                                                                  <C>
Section 1.  Certain Definitions ...............................................    1
 
Section 2.  Appointment of Rights Agent .......................................    5
 
Section 3.  Issuance of Right Certificates ....................................    5
 
Section 4.  Form of Right Certificates ........................................    7
 
Section 5.  Countersignature and Registration .................................    8
 
Section 6.  Transfer, Division, Combination and Exchange of
            Right Certificates; Mutilated, Destroyed, Lost
            or Stolen Right Certificates ......................................    8
 
Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights .....    9
 
Section 8.  Cancellation and Destruction of Right Certificates ................   11
 
Section 9.  Availability of Preferred Shares ..................................   11
 
Section 10. Preferred Shares Record Date ......................................   12
 
Section 11. Adjustment of Purchase Price, Number of Shares or Number of 
            Rights ............................................................   12
 
Section 12. Certificate of Adjusted Purchase Price or Number of Shares ........   19
 
Section 13. Consolidation, Merger or Sale or Transfer of Assets or Earning 
            Power .............................................................   19
 
Section 14. Fractional Rights and Fractional Shares ...........................   21
 
Section 15. Rights of Action ..................................................   23
 
Section 16. Agreement of Right Holders ........................................   23
 
Section 17. Right Certificate Holder Not Deemed a Shareholder .................   24
 
Section 18. Concerning the Rights Agent .......................................   24
 
Section 19. Merger or Consolidation or Change of Name of Rights Agent .........   24
</TABLE> 
 
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                 Page
                                                                                 ----
<S>         <C>                                                                  <C>
Section 20. Duties of Rights Agent ............................................   25
 
Section 21. Change of Rights Agent ............................................   27
 
Section 22. Issuance of New Right Certificates ................................   28
 
Section 23. Redemption ........................................................   28
 
Section 24. Exchange ..........................................................   29
 
Section 25. Notice of Certain Events ..........................................   30
 
Section 26. Notices ...........................................................   31
 
Section 27. Supplements and Amendments ........................................   31
 
Section 28. Successors ........................................................   32
 
Section 29. Benefits of this Agreement ........................................   32
 
Section 30. Severability ......................................................   32
 
Section 31. Governing Law .....................................................   32
 
Section 32. Counterparts ......................................................   32
 
Section 33. Descriptive Headings ..............................................   32
 
Section 34. Notice as to Liability of Trustees and Shareholders ...............   32

Exhibit A -    Form of Articles Supplementary of Cabot Industrial Trust

Exhibit B -    Form of Right Certificate
</TABLE> 
<PAGE>
 
                                RIGHTS AGREEMENT
                                ----------------


     Agreement, dated as of June 11, 1998, as amended and restated as of
September 10, 1998, between Cabot Industrial Trust, a Maryland real estate
investment trust (the "Company"), and BankBoston, N.A., a national banking
association (the "Rights Agent").

     The Board of Trustees of the Company has authorized and declared a dividend
of one preferred share purchase right (a "Right") for each Common Share (as
hereinafter defined) of the Company outstanding as of the close of business on
July 15, 1998 (the "Record Date"), each Right representing the right to purchase
one one-hundredth of a Preferred Share (as hereinafter defined), upon the terms
and subject to the conditions herein set forth, and has further agreed to
authorize and direct the issuance of one Right with respect to each Common Share
that shall become outstanding between the Record Date and the first to occur of
the Redemption Date and the Final Expiration Date (as such terms are hereinafter
defined).

     Accordingly, in consideration of the premises and the mutual agreements
herein set forth, the parties hereby agree as follows:

     Section 1.  Certain Definitions.  For purposes of this Agreement, the
                 -------------------                                      
following terms have the meanings indicated:

          "Acquiring Person" shall mean any Person (as hereinafter defined) who
     or which, together with all Affiliates and Associates (as such terms are
     hereinafter defined) of such Person, shall be the Beneficial Owner (as
     hereinafter defined) of 15% or more of the Common Shares of the Company
     then outstanding, but shall not include the Company, any Subsidiary (as
     hereinafter defined) of the Company, any employee benefit plan of the
     Company or of any Subsidiary of the Company or any entity holding Common
     Shares for or pursuant to the terms of any such plan, or any Grandfathered
     Person (as hereinafter defined).  Notwithstanding the foregoing, no Person
     shall become an "Acquiring Person" as the result of (i) an acquisition of
     Common Shares by the Company which, by reducing the number of Common Shares
     outstanding, increases the proportionate number of Common Shares
     beneficially owned by such Person to 15% or more of the Common Shares of
     the Company then outstanding, or (ii) the acquisition by such Person of
     newly issued Common Shares directly from the Company (it being understood
     that a purchase from an underwriter or other intermediary is not directly
     from the Company); provided, however, that if a Person shall become the
                        --------  -------                                   
     Beneficial Owner of 15% or more of the Common Shares of the Company then
     outstanding by reason of Common Share purchases by the Company or the
     receipt of newly issued Common Shares directly from the Company and shall,
     after such Common Share purchases or direct issuance by the Company, become
     the Beneficial Owner of any additional Common Shares of the Company, then
     such Person shall be deemed to be an "Acquiring 
<PAGE>
 
     Person"; provided further, however, that any transferee from such Person
              -------- -------  -------
     who becomes the Beneficial Owner of 15% or more of the Common Shares of the
     Company then outstanding shall nevertheless be deemed to be an "Acquiring
     Person." Notwithstanding the foregoing, if the Board of Trustees of the
     Company determines in good faith that a Person who would otherwise be an
     "Acquiring Person," as defined pursuant to the foregoing provisions of this
     paragraph, has become such inadvertently, and such Person divests as
     promptly as practicable (and in any event within ten Business Days after
     notification by the Company) a sufficient number of Common Shares so that
     such Person would no longer be an Acquiring Person, as defined pursuant to
     the foregoing provisions of this paragraph, then such Person shall not be
     deemed to be an "Acquiring Person" for any purposes of this Agreement.

          "Affiliate" and "Associate" shall have the respective meanings
     ascribed to such terms in Rule 12b-2 of the General Rules and Regulations
     under the Exchange Act, as in effect on the date of this Agreement.

          A Person shall be deemed the "Beneficial Owner" of and shall be deemed
     to "beneficially own" any securities:

               (i)  which such Person or any of such Person's Affiliates or
          Associates beneficially owns, directly or indirectly;

               (ii)  which such Person or any of such Person's Affiliates or
          Associates, directly or indirectly, has (A) the right to acquire
          (whether such right is exercisable immediately or only after the
          passage of time) pursuant to any agreement, arrangement or
          understanding, whether written or oral (other than customary
          agreements with and between underwriters and selling group members
          with respect to a bona fide public offering of securities), or upon
          the exercise of conversion rights, exchange rights, rights (other than
          the Rights), warrants or options, or otherwise; provided, however,
                                                          --------  -------
          that a Person shall not be deemed the Beneficial Owner of, or to
          beneficially own, securities tendered pursuant to a tender or exchange
          offer made by or on behalf of such Person or any of such Person's
          Affiliates or Associates until such tendered securities are accepted
          for purchase or exchange; (B) the sole or shared right to vote or
          dispose (including any such right pursuant to any agreement,
          arrangement or understanding, whether written or oral); provided,
                                                                  --------
          however, that a Person shall not be deemed the Beneficial Owner of, or
          -------
          to beneficially own, any security if the agreement, arrangement or
          understanding to vote such security (1) arises solely from a revocable
          proxy or consent given to such Person in response to a public proxy or
          consent solicitation made pursuant to, and in accordance with, the
          applicable rules and regulations promulgated under the Exchange Act
          and (2) is not also then reportable on Schedule 13D under the Exchange
          Act (or any comparable or successor report); or (C) "beneficial
          ownership" of (as determined pursuant to Rule 13d-3 of the General
          Rules and Regulations under the Exchange Act); or

                                      -2-
<PAGE>
 
               (iii)  which are beneficially owned, directly or indirectly, by
          any other Person (or any Affiliate or Associate thereof) with which
          such Person or any of such Person's Affiliates or Associates has any
          agreement, arrangement or understanding (other than customary
          agreements with and between underwriters and selling group members
          with respect to a bona fide public offering of securities) for the
          purpose of acquiring, holding, voting (except to the extent
          contemplated by the proviso to clause (B) of subparagraph (ii) of this
          definition) or disposing of any securities of the Company.

          Notwithstanding anything in this definition of Beneficial Ownership to
     the contrary, the phrase "then outstanding," when used with reference to
     the Beneficial Ownership of securities of the Company by any Person, shall
     mean the number of such securities then issued and outstanding together
     with the number of such securities not then actually issued and outstanding
     which such Person would be deemed to own beneficially hereunder.

          "Business Day" shall mean any day other than a Saturday, a Sunday, or
     a day on which banking institutions in New York are authorized or obligated
     by law or executive order to close.

          "Close of business" on any given date shall mean 5:00 P.M., Eastern
     time, on such date; provided, however, that if such date is not a Business
                         --------  -------                                     
     Day it shall mean 5:00 P.M., Eastern time, on the next succeeding Business
     Day.

          "Common Shares" when used with reference to the Company shall mean the
     common shares of beneficial interest, par value $0.01 per share, of the
     Company. "Common Shares" when used with reference to any Person other than
     the Company shall mean the capital stock (or equity interest) with the
     greatest voting power of such other Person or the equity securities or
     other equity interest having power to control or direct the management of
     such other Person.

          "Distribution Date" shall have the meaning set forth in Section 3
     hereof.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
     amended.

          "Exchange Ratio" shall have the meaning set forth in Section 24
     hereof.

          "Expiration Date" shall have the meaning set forth in Section 7
     hereof.

          "Final Expiration Date" shall have the meaning set forth in Section 7
     hereof.

          "Grandfathered Person" shall mean each of the following:  (i) IBM
     Retirement Plan Trust; (ii) Pennsylvania Public School Employes' Retirement
     System; (iii) New York State Teachers' Retirement System; and (iv) State of
     Wisconsin Investment Board. 

                                      -3-
<PAGE>
 
     Notwithstanding the foregoing, a Grandfathered Person shall cease to be a
     Grandfathered Person if (y) such Grandfathered Person becomes the
     Beneficial Owner of an additional 1% or more of the outstanding Common
     Shares without the prior written approval of the Company, other than
     pursuant to dividends or rights (including the Rights) paid or offered to
     shareholders of the Company generally (other than an Acquiring Person or
     Persons) or as the result of an acquisition of Common Shares by the Company
     which, by reducing the number of Common Shares outstanding, increases the
     proportionate number of Common Shares beneficially owned by such
     Grandfathered Person; or (z) such Grandfathered Person ceases to be the
     Beneficial Owner of 15% or more of the Common Shares of the Company then
     outstanding.

          "Person" shall mean any individual, firm, corporation or other entity,
     and shall include any successor (by merger or otherwise) of such entity.

          "Preferred Shares" shall mean the Series A Junior Participating
     Preferred Shares, par value $0.01 per share, of the Company having the
     rights and preferences set forth in the form of Articles Supplementary
     attached to this Agreement as Exhibit A.

          "Principal Party" shall have the meaning set forth in Section 13
     hereof.

          "Purchase Price" shall have the meaning set forth in Section 4 hereof.
 
          "Redemption Date" shall have the meaning set forth in Section 7
     hereof.

          "Right Certificate" shall have the meaning set forth in Section 3
     hereof.

          "Securities Act" shall mean the Securities Act of 1933, as amended.

          "Shares Acquisition Date" shall mean the first date of public
     announcement by the Company that an Acquiring Person has become such.

          "Subsidiary" of any Person shall mean any corporation or other entity
     of which a majority of the voting power of the voting equity securities or
     equity interest is owned, directly or indirectly, by such Person.

          "Trading Day" shall have the meaning set forth in Section 11(d)(i)
     hereof.

          "Triggering Event" shall mean any event described in Section 11(a)(ii)
     or Section 13(a).

     Any determination or interpretation required in connection with any of the
definitions contained in this Section 1 shall be made by the Board of Trustees
of the Company in their good faith judgment, which determination shall be final
and binding on the Rights Agent and on all shareholders of the Company.

                                      -4-
<PAGE>
 
     Section 2.  Appointment of Rights Agent.  The Company hereby appoints the
                 ---------------------------                                  
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3 hereof, shall prior to the Distribution Date also
be the holders of the Common Shares) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such appointment.  The Company may
from time to time appoint such co-Rights Agents as it may deem necessary or
desirable upon ten days' prior written notice to the Rights Agent.  The Rights
Agent shall have no duty to supervise and shall in no event be liable for acts
or omissions of any such co-Rights Agents.

     Section 3.  Issuance of Right Certificates.
                 ------------------------------ 

     (a) Until the earlier of (i) the close of business on the tenth day after
the Shares Acquisition Date (or such specified or unspecified later date as may
be determined by action of the Board of Trustees prior to the occurrence of the
Distribution Date), (ii) the close of business on the fifteenth Business Day (or
such specified or unspecified later date as may be determined by action of the
Board of Trustees prior to the occurrence of a Distribution Date) after the date
of the commencement by any Person (other than the Company, any Subsidiary of the
Company, any employee benefit plan of the Company or of any Subsidiary of the
Company or any entity holding Common Shares for or pursuant to the terms of any
such plan) of, or of the first public announcement of, the intention of any
Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or of any Subsidiary of the Company or any entity
holding Common Shares for or pursuant to the terms of any such plan) to
commence, a tender or exchange offer the consummation of which would result in
any Person becoming the Beneficial Owner of Common Shares aggregating 15% or
more of the then outstanding Common Shares, or (iii) the close of business on
the tenth Business Day (or such specified or unspecified later date as may be
determined by action of the Board of Trustees prior to the occurrence of a
Distribution Date) after the date of filing by any Person of, or the first
public announcement of the intention of any Person to file, any application,
request, submission or other document with any federal or state regulatory
authority seeking approval of, attempting to rebut any presumption of control
upon, or otherwise indicating an intention to enter into, any transaction or
series of transactions the consummation of which would result in any Person
becoming the Beneficial Owner of Common Shares aggregating 15% or more of the
then outstanding Common Shares, other than a transaction in which newly issued
Common Shares are issued directly by the Company to such Person (including any
such date which is after the date of this Agreement and prior to the issuance of
the Rights; the earlier of such dates being herein referred to as the
"Distribution Date"), (x) the Rights will be evidenced (subject to the
provisions of Section 3(b) hereof) by the certificates for Common Shares
registered in the names of the holders thereof (which certificates shall also be
deemed to be certificates for Rights) and not by separate certificates, and (y)
the Rights will be transferable only in connection with the transfer of the
underlying Common Shares (including a transfer to the Company).  As soon as
practicable after the Distribution Date, the Company will prepare and execute,
the Rights Agent will countersign, and the Company will send or cause to be sent
(and the Rights Agent will, if requested, send) by first-class, insured,
postage-prepaid mail, to each record holder of Common Shares as of the close of
business on the Distribution Date, at the address of such holder shown on the
records 

                                      -5-
<PAGE>
 
of the Company, a Right Certificate, in substantially the form of Exhibit B
hereto (a "Right Certificate"), evidencing one Right for each Common Share so
held. As of the Distribution Date, the Rights will be evidenced solely by such
Right Certificates.

     (b) With respect to certificates for Common Shares outstanding as of the
Record Date, until the Distribution Date, the Rights will be evidenced by such
certificates registered in the names of the holders thereof, and registered
holders of Common Shares shall also be the registered holders of the associated
Rights (regardless of whether such ownership is indicated on the Common Share
certificates).  Until the earliest of the Distribution Date, the Redemption Date
or the Final Expiration Date, the transfer of any certificate for Common Shares
shall also constitute the transfer of the Rights associated with the Common
Shares represented thereby.

     (c) Rights shall be issued in respect of all Common Shares which are issued
(whether or not previously issued) after the Record Date but prior to the
earliest of the Distribution Date, the Redemption Date or the Final Expiration
Date.  Certificates evidencing such Common Shares shall also be deemed to be
certificates for Rights.  Certificates evidencing both Common Shares and Rights
in accordance with this Section 3 which are executed and delivered (whether or
not the Common Shares evidenced thereby were previously issued or are presented
for transfer) by the Company (including, without limitation, certificates
representing reacquired Common Shares referred to in the last sentence of this
paragraph (c)) after the Record Date but prior to the earliest of the
Distribution Date, the Redemption Date or the Final Expiration Date shall have
impressed on, printed on, written on or otherwise affixed to them a legend that
by itself or together with prior legends is substantially to the following
effect:

          This certificate also evidences and entitles the holder hereof to
     certain rights as set forth in the Rights Agreement between Cabot
     Industrial Trust (the "Company") and BankBoston, N.A., dated as of
     June 11, 1998 (the "Rights Agreement"), the terms of which are hereby
     incorporated herein by reference and a copy of which is on file at the
     principal offices of the Company.  Under certain circumstances, as set
     forth in the Rights Agreement, the Rights will be evidenced by
     separate certificates and will no longer be evidenced by this
     certificate.  The Company will mail to the holder of this certificate
     a copy of the Rights Agreement, as in effect on the date of mailing,
     without charge promptly after receipt of a written request therefor.
     Under certain circumstances set forth in the Rights Agreement, Rights
     issued to, or held by, any Person who is, was or becomes an Acquiring
     Person or an Affiliate or Associate thereof (as such terms are defined
     in the Rights Agreement), whether currently held by or on behalf of
     such Person or by any subsequent holder, shall become null and void.

Until the Distribution Date, the Rights associated with the Common Shares shall
be evidenced by the certificates evidencing the associated Common Shares alone
(regardless of whether any such certificate contains the above legend), and the
transfer of any such certificate shall also 

                                      -6-
<PAGE>
 
constitute the transfer of the Rights associated with the Common Shares
represented thereby. In the event that the Company purchases or acquires any
Common Shares after the Record Date but prior to the Distribution Date, any
Rights associated with such Common Shares shall be deemed canceled and retired
so that the Company shall not be entitled to exercise any Rights associated with
the Common Shares which are no longer outstanding.

     Section 4.  Form of Right Certificates.
                 -------------------------- 

     (a) The Right Certificates (and the forms of election to purchase Preferred
Shares and of assignment to be printed on the reverse thereof) shall be
substantially the same as Exhibit B hereto and may have such marks of
identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange on which the Rights may from time to
time be listed, or to conform to usage.  Subject to the provisions of Section 11
and Section 22 hereof, the Right Certificates shall entitle the holders thereof
to purchase such number of one one-hundredths of a Preferred Share as shall be
set forth therein at the price per one one-hundredth of a Preferred Share set
forth therein (the "Purchase Price"), but the amount and type of securities
purchasable upon the exercise of each Right and the Purchase Price thereof shall
be subject to adjustment as provided herein.

     (b) Any Right Certificate issued pursuant to Section 3(a) or Section 22
hereof that evidences Rights beneficially owned by:  (i) an Acquiring Person or
any Associate or Affiliate of an Acquiring Person, (ii) a transferee of an
Acquiring Person (or any Associate or Affiliate) who becomes a transferee after
the Acquiring Person becomes an Acquiring Person, or (iii) a transferee of an
Acquiring Person (or any Associate or Affiliate) who becomes a transferee prior
to or concurrently with the Acquiring Person becoming such and receives such
Rights pursuant to either (A) a transfer (whether or not for consideration) from
the Acquiring Person to holders of equity interests in such Acquiring Person or
to any Person with whom the Acquiring Person has any continuing agreement,
arrangement or understanding, whether written or oral, regarding the transferred
Rights or (B) a transfer which is part of a plan, arrangement or understanding,
whether written or oral, which has as a primary purpose or effect the avoidance
of Section 7(e) hereof, and any Right Certificate issued pursuant to Section 6
or Section 11 hereof upon transfer, exchange, replacement or adjustment of any
other Right Certificate referred to in this sentence, shall contain (to the
extent feasible and otherwise reasonably identifiable as such) the following
legend:

          The Rights evidenced by this Right Certificate are or were
     beneficially owned by a Person who was or became an Acquiring Person
     or an Affiliate or Associate of an Acquiring Person (as such terms are
     defined in the Rights Agreement).  Accordingly, this Right Certificate
     and the Rights evidenced hereby may become void in the circumstances
     specified in Section 7(e) of such Agreement.

                                      -7-
<PAGE>
 
The provisions of Section 7(e) shall apply whether or not any Right Certificate
actually contains the foregoing legend.

     Section 5.  Countersignature and Registration.  The Right Certificates
                 ---------------------------------                         
shall be executed on behalf of the Company by the Chairman of its Board of
Trustees, its President or any of its Vice Presidents, or its Secretary, either
manually or by facsimile signature, shall have affixed thereto the Company's
seal or a facsimile thereof, and shall be attested by the Secretary or an
Assistant Secretary of the Company, either manually or by facsimile signature.
The Right Certificates shall be manually countersigned by the Rights Agent and
shall not be valid for any purpose unless countersigned.  In case any officer of
the Company who shall have signed any of the Right Certificates shall cease to
be such officer of the Company before countersignature by the Rights Agent and
issuance and delivery by the Company, such Right Certificates, nevertheless, may
be countersigned by the Rights Agent and issued and delivered by the Company
with the same force and effect as though the person who signed such Right
Certificates had not ceased to be such officer of the Company; and any Right
Certificate may be signed on behalf of the Company by any person who, at the
actual date of the execution of such Right Certificate, shall be a proper
officer of the Company to sign such Right Certificate, although at the date of
the execution of this Rights Agreement any such person was not such an officer.

     Following the Distribution Date, the Rights Agent will keep or cause to be
kept, at its office designated for such purpose, books for registration and
transfer of the Right Certificates issued hereunder.  Such books shall show the
names and addresses of the respective holders of the Right Certificates, the
number of Rights evidenced on its face by each of the Right Certificates and the
date of each of the Right Certificates.

     Section 6.  Transfer, Division, Combination and Exchange of Right
                 -----------------------------------------------------
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates.  Subject
---------------------------------------------------------------------          
to the provisions of Sections 4(b), 7(e), 14 and 24 hereof, at any time after
the close of business on the Distribution Date, and at or prior to the close of
business on the earlier of the Redemption Date or the Final Expiration Date, any
Right Certificate or Right Certificates may be transferred, divided, combined or
exchanged for another Right Certificate or Right Certificates, entitling the
registered holder to purchase a like number of Preferred Shares (or, following a
Triggering Event, Common Shares or other securities or property, as the case may
be) as the Right Certificate or Right Certificates surrendered then entitled
such holder to purchase.  Any registered holder desiring to transfer, divide,
combine or exchange any Right Certificate or Right Certificates shall make such
request in writing delivered to the Rights Agent, and shall surrender the Right
Certificate or Right Certificates to be transferred, divided, combined or
exchanged at the office of the Rights Agent designated for such purpose.
Neither the Rights Agent nor the Company shall be obligated to take any action
whatsoever with respect to the transfer of any such surrendered Right
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Right Certificate and the Company shall have been provided with such additional
evidence of the identity of the Beneficial Owner (or former Beneficial Owner) or
Affiliates or Associates thereof as the Company shall reasonably request.
Thereupon the Rights Agent shall, subject to Sections 4 and 

                                      -8-
<PAGE>
 
7 hereof, countersign and deliver to the person entitled thereto a Right
Certificate or Right Certificates, as the case may be, as so requested. The
Company may require payment of a sum sufficient to cover any tax or governmental
charge that may be imposed in connection with any transfer, division,
combination or exchange of Right Certificates.

     Upon receipt by the Company and the Rights Agent of evidence reasonably
satisfactory to them of the loss, theft, destruction or mutilation of a Right
Certificate, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Right Certificate if mutilated, the Company will make and deliver a new
Right Certificate of like tenor to the Rights Agent for countersignature and
delivery to the registered holder in lieu of the Right Certificate so lost,
stolen, destroyed or mutilated.

     Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights.
                 ------------------------------------------------------------- 

     (a) Subject to Section 7(e) hereof, the registered holder of any Right
Certificate may exercise the Rights evidenced thereby (except as otherwise
provided herein) in whole or in part at any time after the Distribution Date
upon surrender of the Right Certificate, with the form of election to purchase
on the reverse side thereof duly executed, to the Rights Agent at the office of
the Rights Agent designated for such purpose, together with payment of the
Purchase Price with respect to each surrendered Right for the total number of
Preferred Shares (or Common Shares or other securities or property, as the case
may be) as to which the Rights are exercised, at or prior to the earliest of (i)
the close of business on June 11, 2008 (the "Final Expiration Date"), (ii) the
time at which the Rights are redeemed as provided in Section 23 hereof (the
"Redemption Date") or (iii) the time at which such Rights are exchanged as
provided in Section 24 hereof (the earliest to occur of the events described in
(i), (ii) and (iii) being herein referred to as the "Expiration Date").

     (b) The Purchase Price for each one one-hundredth of a Preferred Share
pursuant to the exercise of a Right shall initially be $85.00, shall be subject
to adjustment from time to time as provided in Sections 11 and 13 hereof and
shall be payable in lawful money of the United States of America in accordance
with paragraph (c) below.

     (c) Upon receipt of a Right Certificate evidencing exercisable Rights, with
the form of election to purchase and the certificate on the reverse side of the
Right Certificate duly executed, accompanied by payment of the Purchase Price
for the Preferred Shares (or Common Shares or other securities or property, as
the case may be) to be purchased and an amount equal to any applicable transfer
tax required to be paid by the holder of such Right Certificate in accordance
with Section 9 hereof by certified check, cashier's check or money order payable
to the order of the Company, the Rights Agent shall thereupon promptly (i) (A)
requisition from any transfer agent of the Preferred Shares (or make available,
if the Rights Agent is the transfer agent of the Preferred Shares) certificates
for the number of Preferred Shares to be purchased and the Company hereby
irrevocably authorizes its transfer agent to comply with all such 

                                      -9-
<PAGE>
 
requests, or (B) if the Company shall have elected to deposit the Preferred
Shares issuable upon exercise of the Rights with a depositary agent, requisition
from the depositary agent depositary receipts representing such number of one
one-hundredths of a Preferred Share as are to be purchased (in which case
certificates for the Preferred Shares evidenced by such receipts shall be
deposited by the transfer agent with the depositary agent) and the Company will
direct the depositary agent to comply with such request, (ii) when appropriate,
requisition from the Company the amount of cash to be paid in lieu of issuance
of fractional shares in accordance with Section 14 hereof, (iii) after receipt
of such certificates or depositary receipts, cause the same to be delivered to
or upon the order of the registered holder of such Right Certificate, registered
in such name or names as may be designated by such holder and (iv) when
appropriate, after receipt, deliver such cash to or upon the order of the
registered holder of such Right Certificate. In the event that the Company is
obligated to issue other securities (including Common Shares) of the Company,
pay cash and/or distribute other property pursuant to Section 11(a) hereof, the
Company will make all arrangements necessary so that such other securities, cash
and/or property are available for distribution by the Rights Agent, if and when
appropriate.

     (d) In case the registered holder of any Right Certificate shall exercise
less than all the Rights evidenced thereby, a new Right Certificate evidencing
Rights equivalent to the Rights remaining unexercised shall be issued by the
Rights Agent and delivered to the registered holder of such Right Certificate or
to his duly authorized assigns, subject to the provisions of Section 14 hereof.

     (e) Notwithstanding anything in this Agreement to the contrary, from and
after the occurrence of a Triggering Event, any Rights beneficially owned by (i)
an Acquiring Person or an Associate or Affiliate of an Acquiring Person, (ii) a
transferee of an Acquiring Person (or of any such Associate or Affiliate) who
becomes a transferee after the Acquiring Person becomes an Acquiring Person or
(iii) a transferee of an Acquiring Person (or any Associate or Affiliate) who
becomes a transferee prior to or concurrently with the Acquiring Person becoming
an Acquiring Person and receives such Rights pursuant to either (x) a transfer
(whether or not for consideration) from the Acquiring Person to holders of
equity interests in such Acquiring Person or to any Person with whom the
Acquiring Person has any continuing agreement, arrangement or understanding,
whether written or oral, regarding the transferred Rights or (y) a transfer
which the Board of Trustees otherwise concludes in good faith is part of a plan,
arrangement or understanding, whether written or oral, which has as a primary
purpose or effect the avoidance of this Section 7(e), shall become null and void
without any further action, and any holder of such Rights shall thereupon have
no rights whatsoever with respect to such Rights, whether under any provision of
this Agreement or otherwise, from and after the occurrence of a Triggering
Event.  The Company shall use all reasonable efforts to insure that the
provisions of this Section 7(e) hereof are complied with, but shall have no
liability to any holder of Rights for the inability to make any determinations
with respect to an Acquiring Person or its Affiliates, Associates or transferees
hereunder.

     (f) Notwithstanding anything in this Agreement to the contrary, neither the
Rights Agent nor the Company shall be obligated to undertake any action with
respect to a registered 

                                      -10-
<PAGE>
 
holder upon the occurrence of any purported exercise as set forth in this
Section 7 unless the certificate contained in the form of election to purchase
set forth on the reverse side of the Right Certificate surrendered for such
exercise shall have been completed and signed by the registered holder thereof
and the Company shall have been provided with such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request.

     (g) The Company covenants and agrees that it will cause to be reserved and
kept available out of its authorized and unissued Preferred Shares (and,
following the occurrence of a Triggering Event, Common Shares and/or other
securities), the number of Preferred Shares (and, following the occurrence of a
Triggering Event, Common Shares and/or other securities) that will be sufficient
to permit the exercise in full of all outstanding Rights.

     Section 8.  Cancellation and Destruction of Right Certificates.  All Right
                 --------------------------------------------------            
Certificates surrendered for the purpose of exercise, transfer, division,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Right
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Rights Agreement.  The Company shall deliver to
the Rights Agent for cancellation and retirement, and the Rights Agent shall so
cancel and retire, any other Right Certificate purchased or acquired by the
Company otherwise than upon the exercise thereof. The Rights Agent shall deliver
all canceled Right Certificates to the Company, or shall, at the written request
of the Company, destroy such canceled Right Certificates, and in such case shall
deliver a certificate of destruction thereof to the Company.

     Section 9.  Availability of Preferred Shares.  The Company covenants and
                 --------------------------------                            
agrees that it will take all such action as may be necessary to ensure that all
Preferred Shares (and, following the occurrence of a Triggering Event, Common
Shares and/or other securities) delivered upon exercise of Rights shall, at the
time of delivery of the certificates for such Preferred Shares (and, following
the occurrence of a Triggering Event, Common Shares and/or other securities),
subject to payment of the Purchase Price, be duly and validly authorized and
issued and fully paid and nonassessable.

     The Company further covenants and agrees that it will pay when due and
payable any and all federal and state transfer taxes and charges which may be
payable in respect of the issuance or delivery of the Right Certificates or of
any Preferred Shares (or Common Shares and/or other securities, as the case may
be) upon the exercise of Rights.  The Company shall not, however, be required to
pay any transfer tax which may be payable in respect of any transfer or delivery
of Right Certificates to a person other than, or the issuance or delivery of
certificates or depositary receipts for the Preferred Shares (or Common Shares
and/or other securities, as the case may be) in a name other than that of, the
registered holder of the Right Certificate evidencing Rights surrendered for
exercise or to issue or to deliver any certificates or depositary receipts for
Preferred Shares (or Common Shares and/or other securities, as the case may be)
upon the exercise of any Rights until any such tax shall have been paid (any
such 

                                      -11-
<PAGE>
 
tax being payable by the holder of such Right Certificate at the time of
surrender) or until it has been established to the Company's reasonable
satisfaction that no such tax is due.

     Section 10.  Preferred Shares Record Date.  Each person in whose name any
                  ----------------------------                                
certificate for Preferred Shares (or Common Shares and/or other securities, as
the case may be) is issued upon the exercise of Rights shall for all purposes be
deemed to have become the holder of record of the shares or securities
represented thereby on, and such certificate shall be dated, the date upon which
the Right Certificate evidencing such Rights was duly surrendered and payment of
the Purchase Price (and any applicable transfer taxes) was made; provided,
                                                                 -------- 
however, that if the date of such surrender and payment is a date upon which the
-------                                                                         
Preferred Shares (or Common Shares and/or other securities, as the case may be)
transfer books of the Company are closed, such person shall be deemed to have
become the record holder of such shares or securities on, and such certificate
shall be dated, the next succeeding Business Day on which the Preferred Shares
(or Common Shares and/or other securities, as the case may be) transfer books of
the Company are open.  Prior to the exercise of the Rights evidenced thereby,
the holder of a Right Certificate shall not be entitled to any rights of a
holder of Preferred Shares (or Common Shares and/or other securities, as the
case may be) for which the Rights shall be exercisable, including, without
limitation, the right to vote, to receive dividends or other distributions or to
exercise any preemptive rights, and shall not be entitled to receive any notice
of any proceedings of the Company, except as provided herein.

     Section 11.  Adjustment of Purchase Price, Number of Shares or Number of
                  -----------------------------------------------------------
Rights.  The Purchase Price, the number of Preferred Shares covered by each
------                                                                     
Right and the number of Rights outstanding are subject to adjustment from time
to time as provided in this Section 11.

     (a)  (i) In the event the Company shall at any time after the date of this
     Agreement (A) declare a dividend on the Preferred Shares payable in
     Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C)
     combine the outstanding Preferred Shares into a smaller number of Preferred
     Shares or (D) issue any of its shares in a reclassification of the
     Preferred Shares (including any such reclassification in connection with a
     consolidation or merger in which the Company is the continuing or surviving
     entity), except as otherwise provided in this Section 11(a) and Section
     7(e) hereof, the Purchase Price in effect at the time of the record date
     for such dividend or of the effective date of such subdivision, combination
     or reclassification, and the number and kind of shares issuable on such
     date, shall be proportionately adjusted so that the holder of any Right
     exercised after such time shall be entitled to receive the aggregate number
     and kind of shares which, if such Right had been exercised immediately
     prior to such date and at a time when the Preferred Shares transfer books
     of the Company were open, he would have owned upon such exercise and been
     entitled to receive by virtue of such dividend, subdivision, combination or
     reclassification; provided, however, that in no event shall the
                       --------  -------
     consideration to be paid upon the exercise of one Right be less than the
     aggregate par value of the shares of the Company issuable upon exercise of
     one Right. If an event occurs which would require an adjustment under both
     Section 11(a)(i) and Section 11(a)(ii), the adjustment provided for in this
     Section 11(a)(i) shall be in addition to, and shall be made prior to, any
     adjustment required pursuant to Section 11(a)(ii).

                                      -12-
<PAGE>
 
          (ii) Subject to Section 24 of this Agreement, in the event any Person
     becomes an Acquiring Person, each holder of a Right, except as provided
     below and in Section 7(e) hereof, shall thereafter have a right to receive,
     upon exercise thereof at a price equal to the then current Purchase Price
     multiplied by the number of one one-hundredths of a Preferred Share for
     which a Right is then exercisable, in accordance with the terms of this
     Agreement and in lieu of Preferred Shares, such number of Common Shares of
     the Company as shall equal the result obtained by (A) multiplying the then
     current Purchase Price by the number of one one-hundredths of a Preferred
     Share for which a Right is then exercisable and dividing that product by
     (B) 50% of the then current per share market price of the Company's Common
     Shares (determined pursuant to Section 11(d) hereof) on the date of the
     occurrence of such event. In the event that any Person shall become an
     Acquiring Person and the Rights shall then be outstanding, the Company
     shall not take any action which would eliminate or diminish the benefits
     intended to be afforded by the Rights.

          (iii) In lieu of issuing Common Shares of the Company in accordance
     with Section 11(a)(ii) hereof, the Company may, in the sole discretion of
     the Board of Trustees, elect to (and, in the event that the Board of
     Trustees has not exercised the exchange right contained in Section 24
     hereof and there are not sufficient issued but not outstanding and
     authorized but unissued Common Shares to permit the exercise in full of the
     Rights in accordance with the foregoing subparagraph (ii), the Company
     shall) take all such action as may be necessary to authorize, issue or pay,
     upon the exercise of the Rights, cash (including by way of a reduction of
     the Purchase Price), property, other securities or any combination thereof
     having an aggregate value equal to the value of the Common Shares of the
     Company which otherwise would have been issuable pursuant to Section
     11(a)(ii), which aggregate value shall be determined by a majority of the
     Board of Trustees. For purposes of the preceding sentence, the value of the
     Common Shares shall be determined pursuant to Section 11(d) hereof and the
     value of any equity securities which a majority of the Board of Trustees
     determines to be equivalent to a Common Share (including the Preferred
     Shares, in such ratio as the Board of Trustees shall determine) shall be
     deemed to have the same value as the Common Shares. Any such election by
     the Board of Trustees must be made and publicly announced within 60 days
     following the date on which the event described in Section 11(a)(ii) shall
     have occurred. Following the occurrence of the event described in Section
     11(a)(ii), a majority of the Board of Trustees then in office may suspend
     the exercisability of the Rights for a period of up to 60 days following
     the date on which the event described in Section 11(a)(ii) shall have
     occurred to the extent that the Board of Trustees has not determined
     whether to exercise the Company's right of election under this Section
     11(a)(iii). In the event of any such suspension, the Company shall issue a
     public announcement stating that the exercisability of the Rights has been
     temporarily suspended.

                                      -13-
<PAGE>
 
     (b) In case the Company shall fix a record date for the issuance of rights,
options or warrants to all holders of Preferred Shares entitling them (for a
period expiring within 45 calendar days after such record date) to subscribe for
or purchase Preferred Shares (or shares having the same rights, privileges and
preferences as the Preferred Shares ("equivalent preferred shares")) or
securities convertible into Preferred Shares or equivalent preferred shares at a
price per Preferred Share or equivalent preferred share (or having a conversion
price per share, if a security convertible into Preferred Shares or equivalent
preferred shares) less than the then current per share market price of the
Preferred Shares (as defined in Section 11(d)) on such record date, the Purchase
Price to be in effect after such record date shall be determined by multiplying
the Purchase Price in effect immediately prior to such record date by a
fraction, the numerator of which shall be the number of Preferred Shares
outstanding on such record date plus the number of Preferred Shares which the
aggregate offering price of the total number of Preferred Shares and/or
equivalent preferred shares so to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price and the denominator of which shall be the number of
Preferred Shares outstanding on such record date plus the number of additional
Preferred Shares and/or equivalent preferred shares to be offered for
subscription or purchase (or into which the convertible securities so to be
offered are initially convertible); provided, however, that in no event shall
                                    --------  -------                        
the consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of the Company issuable upon exercise of one
Right.  In case such subscription price is paid in a consideration part or all
of which shall be in a form other than cash, the value of such consideration
shall be as determined in good faith by the Board of Trustees of the Company,
whose determination shall be described in a statement filed with the Rights
Agent and shall be binding on the Rights Agent and on the holders of the Rights.
Preferred Shares owned by or held for the account of the Company shall not be
deemed outstanding for the purpose of any such computation.  Such adjustment
shall be made successively whenever such a record date is fixed; and in the
event that such rights, options or warrants are not so issued, the Purchase
Price shall be adjusted to be the Purchase Price which would then be in effect
if such record date had not been fixed.

     (c)  In case the Company shall fix a record date for the making of a
distribution to all holders of the Preferred Shares (including any such
distribution made in connection with a consolidation or merger in which the
Company is the continuing or surviving entity) of evidences of indebtedness or
assets (other than a regular periodic cash dividend or a dividend payable in
Preferred Shares) or subscription rights or warrants (excluding those referred
to in Section 11(b) hereof), the Purchase Price to be in effect after such
record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the then current per share market price of the Preferred Shares on such
record date, less the fair market value (as determined in good faith by the
Board of Trustees of the Company, whose determination shall be described in a
statement filed with the Rights Agent) of the portion of the assets or evidences
of indebtedness so to be distributed or of such subscription rights or warrants
attributable to one Preferred Share and the denominator of which shall be such
current per share market price of the Preferred Shares; provided, however, that
                                                        --------  -------      
in no event shall the consideration to be paid upon the exercise of one Right be

                                      -14-
<PAGE>
 
less than the aggregate par value of the shares of the Company to be issued upon
exercise of one Right.  Such adjustments shall be made successively whenever
such a record date is fixed; and in the event that such distribution is not so
made, the Purchase Price shall again be adjusted to be the Purchase Price which
would then be in effect if such record date had not been fixed.

     (d)  (i) For the purpose of any computation hereunder, other than under
     Section 11(a)(iii) hereof, the "current per share market price" of any
     security (a "Security" for the purpose of this Section 11(d)(i)) on any
     date shall be deemed to be the average of the daily closing prices per
     share of such Security for the 30 consecutive Trading Days (as such term is
     hereinafter defined) immediately prior to such date, and for the purpose of
     any computation under Section 11(a)(iii) hereof, the "current per share
     market price" of a Security on any date shall be deemed to be the average
     of the daily closing prices per share of such Security for thirty (30)
     consecutive Trading Days immediately following such date; provided,
                                                               --------
     however, that in the event that the current per share market price of the
     -------
     Security is determined during a period following the announcement by the
     issuer of such Security of (A) a dividend or distribution on such Security
     payable in shares of such Security or securities convertible into such
     shares (other than the Rights), or (B) any subdivision, combination or
     reclassification of such Security and prior to the expiration of 30 Trading
     Days after the ex-dividend date for such dividend or distribution, or the
     record date for such subdivision, combination or reclassification, then,
     and in each such case, the "current per share market price" shall be
     appropriately adjusted to reflect the current market price per share
     equivalent (ex-dividend) of such Security. The closing price for each day
     shall be the last sale price, regular way, or, in case no such sale takes
     place on such day, the average of the closing bid and asked prices, regular
     way, in either case as reported in the principal consolidated transaction
     reporting system with respect to securities listed or admitted to trading
     on the New York Stock Exchange or, if the Security is not listed or
     admitted to trading on the New York Stock Exchange, as reported in the
     principal consolidated transaction reporting system with respect to
     securities listed on the principal national securities exchange on which
     the Security is listed or admitted to trading or, if the Security is not
     listed or admitted to trading on any national securities exchange, the last
     quoted price or, if not so quoted, the average of the high bid and low
     asked prices in the over-the-counter market, as reported by the National
     Association of Securities Dealers, Inc. Automated Quotation System
     ("NASDAQ") or such other system then in use, or, if on any such date the
     Security is not quoted by any such organization, the average of the closing
     bid and asked prices as furnished by a professional market maker making a
     market in the Security selected by the Board of Trustees of the Company. If
     on any such date no market maker is making a market in the Security, the
     fair value of such Security on such date (as determined in good faith by
     the Board of Trustees of the Company) shall be used. The term "Trading Day"
     shall mean a day on which the principal national securities exchange on
     which the Security is listed or admitted to trading is open for the
     transaction of business or, if the Security is not listed or admitted to
     trading on any national securities exchange, a Business Day.

          (ii) For the purpose of any computation hereunder, the "current per
     share market price" of the Preferred Shares shall be determined in
     accordance with the method set forth in Section 11(d)(i). If the Preferred
     Shares are not publicly traded, the "current per share

                                      -15-
<PAGE>
 
     market price" of the Preferred Shares shall be conclusively deemed to be
     the current per share market price of the Common Shares of the Company as
     determined pursuant to Section 11(d)(i) (appropriately adjusted to reflect
     any share split, share dividend or similar transaction occurring after the
     date hereof), multiplied by one hundred. If neither the Common Shares of
     the Company nor the Preferred Shares are publicly held or so listed or
     traded, "current per share market price" shall mean the fair value per
     share as determined in good faith by the Board of Trustees of the Company,
     whose determination shall be described in a statement filed with the Rights
     Agent.

     (e) Anything herein to the contrary notwithstanding, no adjustment in the
Purchase Price shall be required unless such adjustment would require an
increase or decrease of at least 1% in the Purchase Price; provided, however,
                                                           --------  ------- 
that any adjustments which by reason of this Section 11(e) are not required to
be made shall be carried forward and taken into account in any subsequent
adjustment.  All calculations under this Section 11 shall be made to the nearest
cent or to the nearest one one-millionth of a Preferred Share or one ten-
thousandth of any other share or security, as the case may be.  Notwithstanding
the first sentence of this Section 11(e), any adjustment required by this
Section 11 shall be made no later than the earlier of (i) three years from the
date of the transaction which requires such adjustment or (ii) the date of the
expiration of the right to exercise any Rights.

     (f) If as a result of an adjustment made pursuant to Section 11(a) or
Section 13(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of the Company other than Preferred Shares,
thereafter the number of such other shares so receivable upon exercise of any
Right shall be subject to adjustment from time to time in a manner and on terms
as nearly equivalent as practicable to the provisions with respect to the
Preferred Shares contained in this Section 11, and the provisions of Sections 7,
9, 10, 13 and 14 with respect to the Preferred Shares shall apply on like terms
to any such other shares.

     (g) All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall entitle the holder thereof
to purchase, at the adjusted Purchase Price, the number of one one-hundredths of
a Preferred Share purchasable from time to time hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

     (h)  Unless the Company shall have exercised its election as provided in
Section 11(i), upon each adjustment of the Purchase Price as a result of the
calculations made in Sections 11(b) and (c), each Right outstanding immediately
prior to the making of such adjustment shall thereafter entitle the holder
thereof to purchase, at the adjusted Purchase Price, that number of one one-
hundredths of a Preferred Share (calculated to the nearest one one-millionth of
a Preferred Share) obtained by (i) multiplying (A) the number of one one-
hundredths of a Preferred Share covered by a Right immediately prior to such
adjustment by (B) the Purchase Price in effect immediately prior to such
adjustment of the Purchase Price and (ii) dividing the product so obtained by
the Purchase Price in effect immediately after such adjustment of the Purchase
Price.

                                      -16-
<PAGE>
 
     (i)  The Company may elect on or after the date of any adjustment of the
Purchase Price to adjust the number of Rights, in substitution for any
adjustment in the number of one one-hundredths of a Preferred Share purchasable
upon the exercise of a Right.  Each of the Rights outstanding after such
adjustment of the number of Rights shall be exercisable for the number of one
one-hundredths of a Preferred Share for which a Right was exercisable
immediately prior to such adjustment.  Each Right held of record prior to such
adjustment of the number of Rights shall become that number of Rights
(calculated to the nearest one ten-thousandth) obtained by dividing the Purchase
Price in effect immediately prior to adjustment of the Purchase Price by the
Purchase Price in effect immediately after adjustment of the Purchase Price.
The Company shall make a public announcement of its election to adjust the
number of Rights, indicating the record date for the adjustment, and, if known
at the time, the amount of the adjustment to be made.  This record date may be
the date on which the Purchase Price is adjusted or any day thereafter, but, if
the Right Certificates have been issued, shall be at least 10 days later than
the date of the public announcement.  If Right Certificates have been issued,
upon each adjustment of the number of Rights pursuant to this Section 11(i), the
Company shall, as promptly as practicable, cause to be distributed to holders of
record of Right Certificates on such record date Right Certificates evidencing,
subject to Section 14 hereof, the additional Rights to which such holders shall
be entitled as a result of such adjustment, or, at the option of the Company,
shall cause to be distributed to such holders of record in substitution and
replacement for the Right Certificates held by such holders prior to the date of
adjustment, and upon surrender thereof, if required by the Company, new Right
Certificates evidencing all the Rights to which such holders shall be entitled
after such adjustment.  Right Certificates so to be distributed shall be issued,
executed and countersigned in the manner provided for herein and shall be
registered in the names of the holders of record of Right Certificates on the
record date specified in the public announcement.

     (j)  Irrespective of any adjustment or change in the Purchase Price or the
number of one one-hundredths of a Preferred Share issuable upon the exercise of
the Rights, the Right Certificates theretofore and thereafter issued may
continue to express the Purchase Price and the number of one one-hundredths of a
Preferred Share which were expressed in the initial Right Certificates issued
hereunder.

     (k)  Before taking any action that would cause an adjustment reducing the
Purchase Price below one one-hundredth of the then par value, if any, of the
Preferred Shares issuable upon exercise of the Rights, the Company shall take
any action which may, in the opinion of its counsel, be necessary in order that
the Company may validly and legally issue fully paid and nonassessable Preferred
Shares at such adjusted Purchase Price.

     (l)  In any case in which this Section 11 shall require that an adjustment
in the Purchase Price be made effective as of a record date for a specified
event, the Company may elect to defer until the occurrence of such event the
issuance to the holder of any Right exercised after such record date of the
Preferred Shares and other securities of the Company, if any, issuable upon such
exercise over and above the Preferred Shares and other securities of the
Company, if any, issuable upon such exercise on the basis of the Purchase Price
in effect prior to such 

                                      -17-
<PAGE>
 
adjustment; provided, however, that the Company shall deliver to such holder a
            --------  -------
due bill or other appropriate instrument evidencing such holder's right to
receive such additional shares upon the occurrence of the event requiring such
adjustment.

     (m)  Anything in this Section 11 to the contrary notwithstanding, the
Company shall be entitled to make such reductions in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that it in its sole discretion shall determine to be advisable in
order that any consolidation or subdivision of the Preferred Shares, issuance
wholly for cash of any Preferred Shares at less than the current market price,
issuance wholly for cash of Preferred Shares or securities which by their terms
are convertible into or exchangeable for Preferred Shares, dividends on
Preferred Shares payable in Preferred Shares or issuance of rights, options or
warrants referred to hereinabove in Section 11(b), hereafter made by the Company
to holders of its Preferred Shares shall not be taxable to such shareholders.

     (n)  In the event that at any time after the date of this Agreement and
prior to the Distribution Date, the Company shall (i) declare or pay any
dividend on the Common Shares payable in Common Shares or (ii) effect a
subdivision, combination or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares)
into a greater or lesser number of Common Shares, then in any such case (x) the
number of one one-hundredths of a Preferred Share purchasable after such event
upon proper exercise of each Right shall be determined by multiplying the number
of one one-hundredths of a Preferred Share so purchasable immediately prior to
such event by a fraction, the numerator of which is the number of Common Shares
outstanding immediately before such event and the denominator of which is the
number of Common Shares outstanding immediately after such event, and (y) each
Common Share outstanding immediately after such event shall have issued with
respect to it that number of Rights which each Common Share outstanding
immediately prior to such event had issued with respect to it.  The adjustments
provided for in this Section 11(n) shall be made successively whenever such a
dividend is declared or paid or such a subdivision, combination or consolidation
is effected.

     (o)  So long as the shares issuable upon the exercise of the Rights may be
listed on any national securities exchange, the Company shall use its best
efforts to cause, from and after such time as the Rights become exercisable, all
shares reserved for such issuance to be listed on such exchange upon official
notice of issuance upon such exercise.

     (p)  The Company shall use its best efforts to (i) file, as soon as
practicable following the first occurrence of a Triggering Event, a registration
statement under the Securities Act with respect to the securities purchasable
upon exercise of the Rights on an appropriate form, (ii) cause such registration
statement to become effective as soon as practicable after such filing, and
(iii) cause such registration statement to remain effective (with a prospectus
at all times meeting the requirements of the Securities Act) until the date of
the expiration of the Rights.  The Company will also take such action as may be
appropriate under the blue sky laws of the various states.  The Company may
temporarily suspend, for a period of time not to exceed 90 days, the

                                      -18-
<PAGE>
 
exercisability of the Rights in order to prepare and file such registration
statement or in order to comply with such blue sky laws.  Upon any such
suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended.

     (q) In the event that the Rights become exercisable following the
occurrence of a Triggering Event, the Company may permit the Rights, subject to
Section 7(e) hereof, to be exercised for 50% of the Common Shares (or cash,
property or other securities to be substituted for Common Shares pursuant to
Section 11(a)(iii)) that would otherwise be purchasable under subsection (a) in
consideration of the surrender to the Company of the Rights so exercised and
without other payment of the Purchase Price.  Rights exercised under this
subsection (q) shall be deemed to have been exercised in full and shall be
canceled.

     Section 12.  Certificate of Adjusted Purchase Price or Number of Shares.
                  ----------------------------------------------------------  
Whenever an adjustment is made as provided in Section 11 or 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment,
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Common Shares or the
Preferred Shares a copy of such certificate and (c) mail a brief summary thereof
to each holder of a Right Certificate in accordance with Section 25 hereof.  The
Rights Agent shall be fully protected in relying on any such certificate and on
any adjustment therein contained and may assume that no adjustment has been made
unless and until it shall have received such certificate.

     Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning
                  --------------------------------------------------------------
Power.
----- 

     (a)  If after the Shares Acquisition Date, directly or indirectly, (x) the
Company shall consolidate with, or merge with and into, any other Person, (y)
any Person shall consolidate with the Company, or merge with and into the
Company and the Company shall be the continuing or surviving entity of such
merger and, in connection with such merger, all or part of the Common Shares
shall be changed into or exchanged for stock or other securities of any other
Person (or the Company) or cash or any other property, or (z) the Company shall
sell or otherwise transfer (or one or more of its Subsidiaries shall sell or
otherwise transfer), in one or more transactions, assets or earning power
aggregating 50% or more of the assets or earning power of the Company and its
Subsidiaries (taken as a whole) to any Person or Persons other than the Company
or one or more of its wholly-owned Subsidiaries, then, and in each such case,
proper provision shall be made so that (i) each holder of a Right (except as
otherwise provided herein) shall thereafter have the right to receive, upon the
exercise thereof at a price equal to the then current Purchase Price multiplied
by the number of one one-hundredths of a Preferred Share for which a Right is
then exercisable, in accordance with the terms of this Agreement and in lieu of
Preferred Shares, such number of validly authorized and issued, fully paid, non-
assessable and freely tradeable common shares of the Principal Party (as
hereinafter defined), free and clear of all liens, rights of call or first
refusal, encumbrances or other adverse claims, as shall equal the result
obtained by (A) multiplying the then current Purchase Price by the number of one
one-hundredths of a Preferred Share for which a Right is then exercisable (or,
if such Right is not then exercisable for a number of one one-hundredths of a
Preferred Share, 

                                      -19-
<PAGE>
 
the number of such fractional shares for which it was exercisable immediately
prior to an event described under Section 11(a)(ii) hereof) and dividing that
product by (B) 50% of the then current per share market price of the common
shares of such Principal Party (determined pursuant to Section 11(d) hereof) on
the date of consummation of such consolidation, merger, sale or transfer; (ii)
such Principal Party shall thereafter be liable for, and shall assume, by virtue
of such consolidation, merger, sale or transfer, or otherwise, all the
obligations and duties of the Company pursuant to this Agreement; (iii) the term
"Company" shall thereafter be deemed to refer to such Principal Party and (iv)
such Principal Party shall take such steps (including, but not limited to, the
authorization and reservation of a sufficient number of its common shares in
accordance with Section 9 hereof) in connection with such consummation as may be
necessary to assure that the provisions hereof shall thereafter be applicable,
as nearly as reasonably may be, in relation to its common shares thereafter
deliverable upon the exercise of the Rights.

     (b)  "Principal Party" shall mean:

          (i) In the case of any transaction described in (x) or (y) of the
     first sentence of Section 13(a), the Person that is the issuer of any
     securities into which Common Shares of the Company are converted in such
     merger or consolidation, and if no securities are so issued, the Person
     that is the surviving entity of such merger or consolidation (including the
     Company if applicable); and

          (ii) in the case of any transaction described in (z) of the first
     sentence in Section 13(a), the Person that is the party receiving the
     greatest portion of the assets or earning power transferred pursuant to
     such transaction or transactions;

provided, however, that in any such case described in clauses (b)(i) and
--------  -------                                                       
(b)(ii):  (1) if the common shares of such Person are not at such time and have
not been continuously over the preceding 12-month period registered under
Section 12 of the Exchange Act, and such Person is a direct or indirect
Subsidiary of another Person the common shares of which are and have been so
registered, "Principal Party" shall refer to such other Person; (2) in case such
Person is a Subsidiary, directly or indirectly, of more than one Person, the
common shares of two or more of which are and have been so registered,
"Principal Party" shall refer to whichever of such Persons is the issuer of the
common shares having the greatest aggregate market value; and (3) in case such
Person is owned, directly or indirectly, by a joint venture formed by two or
more Persons that are not owned, directly or indirectly, by the same Person, the
rules set forth in (1) and (2) above shall apply to each of the chains of
ownership having an interest in such joint venture as if such party were a
"Subsidiary" of both or all of such joint venturers and the Principal Parties in
each such chain shall bear the obligations set forth in this Section 13 in the
same ratio as their direct or indirect interests in such Person bear to the
total of such interests.

     (c) The Company shall not consummate any such consolidation, merger, sale
or transfer unless the Principal Party shall have sufficient common shares
authorized to permit the full exercise of the Rights and prior thereto the
Company and such Principal Party shall have 

                                      -20-
<PAGE>
 
executed and delivered to the Rights Agent a supplemental agreement providing
for the terms set forth in paragraphs (a) and (b) of this Section 13 and further
providing that, as soon as practicable after the date of any consolidation,
merger or sale of assets mentioned in paragraph (a) of this Section 13, the
Principal Party will:

          (i) prepare and file a registration statement under the Securities
     Act, with respect to the Rights and the securities purchasable upon
     exercise of the Rights on an appropriate form, and will use its best
     efforts to cause such registration statement to (A) become effective as
     soon as practicable after such filing and (B) remain effective (with a
     prospectus at all times meeting the requirements of the Securities Act)
     until the Expiration Date;

          (ii) deliver to holders of the Rights historical financial statements
     for the Principal Party and each of its Affiliates which comply in all
     respects with the requirements for registration on Form 10 under the
     Exchange Act; and

          (iii) take such actions as may be necessary or appropriate under the
     blue sky laws of the various states.

The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations or sales or other transfers.  In the event that one of the
transactions described in this Section 13(a) shall occur at any time after the
occurrence of a transaction described in Section 11(a)(ii) hereof, the Rights
which have not theretofore been exercised shall thereafter become exercisable in
the manner described in Section 13(a).

     Section 14. Fractional Rights and Fractional Shares.
                 --------------------------------------- 

     (a) The Company shall not be required to issue fractions of Rights or to
distribute Right Certificates which evidence fractional Rights.  In lieu of such
fractional Rights, there may be paid to the registered holders of the Right
Certificates with regard to which such fractional Rights would otherwise be
issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right.  For the purposes of this Section 14(a), the current
market value of a whole Right shall be the closing price of the Rights for the
Trading Day immediately prior to the date on which such fractional Rights would
have been otherwise issuable.  The closing price for any day shall be the last
sale price, regular way, or, in case no such sale takes place on such day, the
average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if the Rights are not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national securities exchange
on which the Rights are listed or admitted to trading or, if the Rights are not
listed or admitted to trading on any national securities exchange, the last
quoted price or, if not so quoted, the average of the high bid and low asked
prices in the over-the-counter market, as reported by NASDAQ or such other
system then in use or, if on any such date the Rights are 

                                      -21-
<PAGE>
 
not quoted by any such organization, the average of the closing bid and asked
prices as furnished by a professional market maker making a market in the Rights
selected by the Board of Trustees of the Company. If on any such date no such
market maker is making a market in the Rights, the fair value of the Rights on
such date as determined in good faith by the Board of Trustees of the Company
shall be used.

     (b) The Company shall not be required to issue fractions of Preferred
Shares (other than fractions which are integral multiples of one one-hundredth
of a Preferred Share) upon exercise of the Rights or to distribute certificates
which evidence fractional Preferred Shares (other than fractions which are
integral multiples of one one-hundredth of a Preferred Share).  Fractions of
Preferred Shares in integral multiples of one one-hundredth of a Preferred Share
may, at the election of the Company, be evidenced by depositary receipts,
pursuant to an appropriate agreement between the Company and a depositary
selected by it; provided, that such agreement shall provide that the holders of
                --------                                                       
such depositary receipts shall have all the rights, privileges and preferences
to which they are entitled as beneficial owners of the Preferred Shares
represented by such depositary receipts.  In lieu of fractional Preferred Shares
that are not integral multiples of one one-hundredth of a Preferred Share, the
Company may, to the extent necessary to reduce such fraction to an integral
multiple of one one-hundredth, pay to the registered holders of Right
Certificates at the time such Rights are exercised as herein provided an amount
in cash equal to the same fraction of the current market value of one one-
hundredth of a Preferred Share.  For the purposes of this Section 14(b), the
current market value of one one-hundredth of a Preferred Share shall be one one-
hundredth of the closing price of a Preferred Share (as determined pursuant to
the second sentence of Section 11(d)(i) hereof) for the Trading Day immediately
prior to the date of such exercise.

     (c) Following the occurrence of a Triggering Event, the Company shall not
be required to issue fractions of Common Shares upon exercise of the Rights or
to distribute certificates which evidence fractional Common Shares.  In lieu of
fractional Common Shares, the Company may pay to the registered holders of Right
Certificates at the time such Rights are exercised as herein provided an amount
in cash equal to the same fraction of the current market value of one Common
Share.  For purposes of this Section 14(c), the current market value of one
Common Share shall be the closing price of one Common Share (as determined
pursuant to the second sentence of Section 11(d)(i) hereof) for the Trading Day
immediately prior to the date of such exercise.

     (d) The holder of a Right by the acceptance of the Right expressly waives
his right to receive any fractional Rights or any fractional shares upon
exercise of a Right (except as provided above).

     Section 15.  Rights of Action.  All rights of action in respect of this
                  ----------------                                          
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Right Certificate (or, prior to
the Distribution Date, of the Common Shares), without the consent of the Rights

                                      -22-
<PAGE>
 
Agent or of the holder of any other Right Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his own behalf and for his own
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce, or otherwise act in respect of, his right to
exercise the Rights evidenced by such Right Certificate in the manner provided
in such Right Certificate and in this Agreement.  Without limiting the foregoing
or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and will be entitled to specific performance of
the obligations under, and injunctive relief against actual or threatened
violations of the obligations of any Person subject to, this Agreement.

     Section 16.  Agreement of Right Holders.  Every holder of a Right, by
                  --------------------------                              
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

     (a) prior to the Distribution Date, the Rights will be transferable
only in connection with the transfer of the Common Shares;

     (b) after the Distribution Date, the Right Certificates are transferable
only on the registry books of the Rights Agent if surrendered at the principal
office of the Rights Agent, duly endorsed or accompanied by a proper instrument
of transfer;

     (c) the Company and the Rights Agent may deem and treat the person in whose
name the Right Certificate (or, prior to the Distribution Date, the associated
Common Shares certificate) is registered as the absolute owner thereof and of
the Rights evidenced thereby (notwithstanding any notations of ownership or
writing on the Right Certificates or the associated Common Shares certificate
made by anyone other than the Company or the Rights Agent) for all purposes
whatsoever, and neither the Company nor the Rights Agent shall be affected by
any notice to the contrary; and

     (d) notwithstanding anything in this Agreement to the contrary, neither the
Company nor the Rights Agent shall have any liability to any holder of a Right
or any other Person as a result of its inability to perform any of its
obligations under this Agreement by reason of any preliminary or permanent
injunction or other order, decree or ruling issued by a court of competent
jurisdiction or by a governmental, regulatory or administrative agency or
commission, or any statute, rule, regulation or executive order promulgated or
enacted by any governmental authority prohibiting or otherwise restraining
performance of such obligation.

     Section 17.  Right Certificate Holder Not Deemed a Shareholder.  No holder,
                  -------------------------------------------------             
as such, of any Right Certificate shall be entitled to vote, receive dividends
or be deemed for any purpose the holder of the Preferred Shares or any other
securities of the Company which may at any time be issuable on the exercise of
the Rights represented thereby, nor shall anything contained herein or in any
Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a shareholder of the Company or any
right to vote for the election of 

                                      -23-
<PAGE>
 
trustees or upon any matter submitted to shareholders at any meeting thereof, or
to give or withhold consent to any trust action, or to receive notice of
meetings or other actions affecting shareholders (except as provided in Section
25 hereof), or to receive dividends or subscription rights, or otherwise, until
the Right or Rights evidenced by such Right Certificate shall have been
exercised in accordance with the provisions hereof.

     Section 18.  Concerning the Rights Agent.  The Company agrees to pay to the
                  ---------------------------                                   
Rights Agent reasonable compensation for all services rendered by it hereunder
and, from time to time, on demand of the Rights Agent, its reasonable expenses
and counsel fees and other disbursements incurred in the administration and
execution of this Agreement and the exercise and performance of its duties
hereunder. The Company also agrees to indemnify the Rights Agent for, and to
hold it harmless against, any loss, liability, or expense, incurred without
gross negligence, bad faith or willful misconduct on the part of the Rights
Agent, for anything done or omitted by the Rights Agent in connection with the
acceptance and administration of this Agreement, including the costs and
expenses of defending against any claim of liability in the premises.

     The Rights Agent shall be protected and shall incur no liability for, or in
respect of any action taken, suffered or omitted by it in connection with, its
administration of this Agreement in reliance upon any Right Certificate or
certificate for the Preferred Shares or Common Shares or for other securities of
the Company, instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement, or other paper or document believed by it to be genuine and to be
signed, executed and, where necessary, verified or acknowledged, by the proper
person or persons, or otherwise upon the advice of counsel as set forth in
Section 20 hereof.

     Section 19.  Merger or Consolidation or Change of Name of Rights Agent.
                  ---------------------------------------------------------  
Any Person into which the Rights Agent or any successor Rights Agent may be
merged or with which it may be consolidated, or any Person resulting from any
merger or consolidation to which the Rights Agent or any successor Rights Agent
shall be a party, or any Person succeeding to the stock transfer or corporate
trust business of the Rights Agent or any successor Rights Agent, shall be the
successor to the Rights Agent under this Agreement without the execution or
filing of any paper or any further act on the part of any of the parties hereto;
provided, that such Person would be eligible for appointment as a successor
--------                                                                   
Rights Agent under the provisions of Section 21 hereof.  In case at the time
such successor Rights Agent shall succeed to the agency created by this
Agreement, any of the Right Certificates shall have been countersigned but not
delivered, any such successor Rights Agent may adopt the countersignature of the
predecessor Rights Agent and deliver such Right Certificates so countersigned;
and in case at that time any of the Right Certificates shall not have been
countersigned, any successor Rights Agent may countersign such Right
Certificates either in the name of the predecessor Rights Agent or in the name
of the successor Rights Agent; and in all such cases such Right Certificates
shall have the full force provided in the Right Certificates and in this
Agreement.

                                      -24-
<PAGE>
 
     In case at any time the name of the Rights Agent shall be changed and at
such time any of the Right Certificates shall have been countersigned but not
delivered, the Rights Agent may adopt the countersignature under its prior name
and deliver Right Certificates so countersigned; and in case at that time any of
the Right Certificates shall not have been countersigned, the Rights Agent may
countersign such Right Certificates either in its prior name or in its changed
name; and in all such cases such Right Certificates shall have the full force
provided in the Right Certificates and in this Agreement.

     Section 20.  Duties of Rights Agent.  The Rights Agent undertakes the
                  ----------------------                                  
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Right Certificates,
by their acceptance thereof, shall be bound:

     (a)  The Rights Agent may consult with legal counsel (who may be legal
counsel for the Company), and the opinion of such counsel shall be full and
complete authorization and protection to the Rights Agent as to any action taken
or omitted by it in good faith and in accordance with such opinion.

     (b)  Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it necessary or desirable that any fact or matter be
proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and
established by a certificate signed by the Chairman of the Board, the President,
any Vice President, or the Secretary of the Company and delivered to the Rights
Agent; and such certificate shall be full authorization to the Rights Agent for
any action taken or suffered in good faith by it under the provisions of this
Agreement in reliance upon such certificate.

     (c)  The Rights Agent shall be liable hereunder to the Company and any
other Person only for any and all losses, liabilities, costs, damages and
expenses (including attorneys' fees) arising out of or in connection with the
Rights Agent's gross negligence, bad faith or willful misconduct.  Anything in
this Agreement to the contrary notwithstanding, in no event shall the Rights
Agent be liable for special, indirect or consequential loss or damage of any
kind whatsoever (including but not limited to lost profits), even if the Rights
Agent has been advised of the likelihood of such loss or damage and regardless
of the form of the action.

     (d)  The Rights Agent shall not be liable for or by reason of any of the
statements of fact or recitals contained in this Agreement or in the Right
Certificates (except its countersignature thereof) or be required to verify the
same, but all such statements and recitals are and shall be deemed to have been
made by the Company only.

     (e)  The Rights Agent shall not be under any responsibility in respect of
the validity of this Agreement or the execution and delivery hereof (except the
due execution hereof by the Rights Agent) or in respect of the validity or
execution of any Right Certificate (except its countersignature thereof); nor
shall it be responsible for any breach by the Company of any covenant or
condition contained in this Agreement or in any Right Certificate; nor shall it
be 

                                      -25-
<PAGE>
 
responsible for any change in the exercisability of the Rights (including the
Rights becoming void pursuant to Section 7(e) hereof) or any adjustment in the
terms of the Rights (including the manner, method or amount thereof) provided
for in Section 3, 11, 13, 23 or 24, or the ascertaining of the existence of
facts that would require any such change or adjustment (except with respect to
the exercise of Rights evidenced by Right Certificates after receipt of a
certificate furnished pursuant to Section 12 describing a change or adjustment);
nor shall it by any act hereunder be deemed to make any representation or
warranty as to the authorization or reservation of any Preferred Shares or
Common Shares to be issued pursuant to this Agreement or any Right Certificate
or as to whether any Preferred Shares or Common Shares will, when issued, be
validly authorized and issued, fully paid and nonassessable.

     (f)  The Company agrees that it will perform, execute, acknowledge and
deliver or cause to be performed, executed, acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying out or performing by the Rights Agent of
the provisions of this Agreement.

     (g)  The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from the
Chairman of the Board, the President, any Vice President, the Secretary or the
Treasurer of the Company, and to apply to such officers for advice or
instructions in connection with its duties, and it shall not be liable for any
action taken or suffered by it in good faith in accordance with instructions of
any such officer or for any delay in acting while waiting for those
instructions.  Any application by the Rights Agent for written instructions from
the Company may, at the option of the Rights Agent, set forth in writing any
action proposed to be taken or omitted by the Rights Agent under this Agreement
and the date on and/or after which such action shall be taken or such omission
shall be effective.  The Rights Agent shall not be liable for any action taken
by, or omission of, the Rights Agent in accordance with a proposal included in
any such application on or after the date specified in such application (which
date shall not be less than five Business Days after the date any officer of the
Company actually receives such application, unless any such officer shall have
consented in writing to an earlier date) unless, prior to taking any such action
(or the effective date in the case of an omission), the Rights Agent shall have
received written instructions in response to such application specifying the
action to be taken or omitted.

     (h)  The Rights Agent and any stockholder, Trustee, officer or employee of
the Rights Agent may buy, sell or deal in any of the Rights or other securities
of the Company or its Subsidiaries or become pecuniarily interested in any
transaction in which the Company or its Subsidiaries may be interested, or
contract with or lend money to the Company or its Subsidiaries or otherwise act
as fully and freely as though it were not Rights Agent under this Agreement.
Nothing herein shall preclude the Rights Agent from acting in any other capacity
for the Company or its Subsidiaries or for any other legal entity.

     (i)  The Rights Agent may execute and exercise any of the rights or powers
hereby vested in it or perform any duty hereunder either itself or by or through
its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct 

                                      -26-
<PAGE>
 
of any such attorneys or agents or for any loss to the Company resulting from
any such act, default, neglect or misconduct, provided reasonable care was
exercised in the selection and continued employment thereof.

     (j)  If, with respect to any Rights Certificate surrendered to the Rights
Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has either not
been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise of transfer without first consulting with the Company.

     Section 21.  Change of Rights Agent.  The Rights Agent or any successor
                  ----------------------                                    
Rights Agent may resign and be discharged from its duties under this Agreement
upon 30 days' notice in writing mailed to the Company and to each transfer agent
of the Common Shares or Preferred Shares by registered or certified mail, and to
the holders of the Right Certificates by first-class mail.  The Company may
remove the Rights Agent or any successor Rights Agent upon 30 days' notice in
writing, mailed to the Rights Agent or successor Rights Agent, as the case may
be, and to each transfer agent of the Common Shares or Preferred Shares by
registered or certified mail, and to the holders of the Right Certificates by
first-class mail.  If the Rights Agent shall resign or be removed or shall
otherwise become incapable of acting, the Company shall appoint a successor to
the Rights Agent.  If the Company shall fail to make such appointment within a
period of 30 days after giving notice of such removal or after it has been
notified in writing of such resignation or incapacity by the resigning or
incapacitated Rights Agent or by the holder of a Right Certificate (who shall,
with such notice, submit his Right Certificate for inspection by the Company),
then the registered holder of any Right Certificate may apply to any court of
competent jurisdiction for the appointment of a new Rights Agent.  Any successor
Rights Agent, whether appointed by the Company or by such a court, shall be a
corporation or bank organized and doing business under the laws of the United
States or of any other state of the United States, which is authorized under
such laws to exercise corporate trust or stock transfer powers and is subject to
supervision or examination by federal or state authority and which has at the
time of its appointment as Rights Agent a combined capital and surplus of at
least $100 million.  After appointment, the successor Rights Agent shall be
vested with the same powers, rights, duties and responsibilities as if it had
been originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose.  Not later
than the effective date of any such appointment the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Common Shares or Preferred Shares, and mail a notice thereof in writing to
the registered holders of the Right Certificates.  Failure to give any notice
provided for in this Section 21, however, or any defect therein, shall not
affect the legality or validity of the resignation or removal of the Rights
Agent or the appointment of the successor Rights Agent, as the case may be.

     Section 22.  Issuance of New Right Certificates.  Notwithstanding any of
                  ----------------------------------                         
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new 

                                      -27-
<PAGE>
 
Right Certificates evidencing Rights in such form as may be approved by its
Board of Trustees to reflect any adjustment or change in the Purchase Price and
the number or kind or class of shares or other securities or property
purchasable under the Right Certificates made in accordance with the provisions
of this Agreement.

     Section 23.  Redemption.
                  ---------- 

     (a)  The Company may, at its option, at any time prior to the close of
business on the tenth day (or such specified or unspecified later date as may be
determined by action of the Board of Trustees prior to such tenth day) following
the Shares Acquisition Date, redeem all but not less than all the then
outstanding Rights at a redemption price of $0.01 per Right, appropriately
adjusted to reflect any share split, share dividend or similar transaction
occurring after the date hereof (such redemption price being hereinafter
referred to as the "Redemption Price").  The redemption of the Rights by the
Company may be made effective at such time on such basis and with such
conditions as the Board of Trustees in its sole discretion may establish.
Notwithstanding anything in this Agreement to the contrary, the Rights shall not
be exercisable after the first occurrence of any event described in Section
11(a)(ii) hereof until such time as the Company's right of redemption hereunder
has expired.  The Company may, at its option, pay the Redemption Price in cash,
Common Shares (based on the current per share market price of the Common Shares
at the time of redemption) or any other form of consideration deemed appropriate
by the Board of Trustees.

     (b)  Immediately upon the action of the Board of Trustees of the Company
ordering the redemption of the Rights (or at the effective time of such
redemption established by the Board of Trustees of the Company pursuant to the
last sentence of paragraph (a) of this Section 23), and without any further
action and without any notice, the right to exercise the Rights will terminate
and the only right thereafter of the holders of Rights shall be to receive the
Redemption Price.  The Company shall promptly give public notice of any such
redemption; provided, however, that the failure to give, or any defect in, any
            --------  -------                                                 
such notice shall not affect the validity of such redemption.  Within 10 days
after such action of the Board of Trustees ordering the redemption of the Rights
or, if later, the effectiveness of the redemption of the Rights pursuant to the
last sentence of paragraph (a), the Company shall mail a notice of redemption to
all the holders of the then outstanding Rights at their last addresses as they
appear upon the registry books of the Rights Agent or, prior to the Distribution
Date, on the registry books of the transfer agent for the Common Shares.  Any
notice which is mailed in the manner herein provided shall be deemed given,
whether or not the holder receives the notice.  Each such notice of redemption
will state the method by which the payment of the Redemption Price will be made.
The Company may, at its option, discharge all of its obligations with respect to
the Rights by (i) issuing a press release announcing the manner of redemption of
the Rights, (ii) depositing with a bank or trust company having a capital and
surplus of at least $100,000,000, funds necessary for such redemption, in trust,
to be applied to the redemption of the Rights so called for redemption and (iii)
arranging for the mailing of the Redemption Price to the registered holders of
the Rights; then, and upon such action, all outstanding Rights Certificates
shall be null and void without further action by the Company.  Neither the
Company nor any 

                                      -28-
<PAGE>
 
of its Affiliates or Associates may redeem, acquire or purchase for value any
Rights at any time in any manner other than that specifically set forth in this
Section 23, in Section 24 hereof, or in connection with the purchase of Common
Shares prior to the Distribution Date.

     Section 24.  Exchange.
                  -------- 

     (a)  The Company may, at its option, at any time after a Triggering Event,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include Rights that have become void pursuant to the provisions of Section
7(e) hereof) for Common Shares at an exchange ratio of one Common Share per
Right, appropriately adjusted to reflect any share split, share dividend or
similar transaction occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "Exchange Ratio").  Notwithstanding the
foregoing, the Company shall not be empowered to effect such exchange at any
time after any Person (other than the Company, any Affiliate or Subsidiary of
the Company, any employee benefit plan of the Company or of any Affiliate or
Subsidiary of the Company or any entity holding Common Shares for or pursuant to
the terms of any such plan), together with all Affiliates and Associates of such
Person, becomes the Beneficial Owner of 50% or more of the Common Shares then
outstanding.

     (b)  Immediately upon the action of the Board of Trustees of the Company
ordering the exchange of any Rights pursuant to paragraph (a) of this Section 24
and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of Common Shares equal to the number of
such Rights held by such holder multiplied by the Exchange Ratio.  The Company
shall promptly give public notice of any such exchange; provided, however, that
                                                        --------  -------      
the failure to give, or any defect in, such notice shall not affect the validity
of such exchange.  The Company promptly shall mail a notice of any such exchange
to all of the holders of such Rights at their last addresses as they appear upon
the registry books of the Rights Agent.  Any notice which is mailed in the
manner herein provided shall be deemed given, whether or not the holder receives
the notice.  Each such notice of exchange will state the method by which the
exchange of the Common Shares for Rights will be effected and, in the event of
any partial exchange, the number of Rights which will be exchanged.  Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 7(e) hereof)
held by each holder of Rights.

     (c)  In any exchange pursuant to this Section 24, the Company, at its
option, may substitute Preferred Shares (or equivalent preferred shares, as such
term is defined in Section 11(b) hereof) for Common Shares exchangeable for
Rights, at the initial rate of one one-hundredth of a Preferred Share (or
equivalent preferred share) for each Common Share, as appropriately adjusted to
reflect adjustments in the voting rights of the Preferred Shares pursuant to the
terms thereof, so that the fraction of a Preferred Share delivered in lieu of
each Common Share shall have the same voting rights as one Common Share.

                                      -29-
<PAGE>
 
     (d)  In the event that there shall not be sufficient Common Shares or
Preferred Shares issued but not outstanding or authorized but unissued to permit
any exchange of Rights as contemplated in accordance with this Section 24, the
Company shall take all such action as may be necessary to authorize additional
Common Shares or Preferred Shares for issuance upon exchange of the Rights.

     (e)  The Company shall not be required to issue fractions of Common Shares
or to distribute certificates which evidence fractional Common Shares.  In lieu
of such fractional Common Shares, the Company shall pay to the registered
holders of the Right Certificates with regard to which such fractional Common
Shares would otherwise be issuable an amount in cash equal to the same fraction
of the current market value of a whole Common Share.  For the purposes of this
paragraph (e), the current market value of a whole Common Share shall be the
closing price of a Common Share (as determined pursuant to the second sentence
of Section 11(d)(i) hereof) for the Trading Day immediately prior to the date of
exchange pursuant to this Section 24.

     Section 25.  Notice of Certain Events.
                  ------------------------ 

     (a)  In case the Company shall propose at any time after the Distribution
Date (i) to pay any dividend payable in shares of any class to the holders of
its Preferred Shares or to make any other distribution to the holders of its
Preferred Shares (other than a regular quarterly cash dividend), (ii) to offer
to the holders of its Preferred Shares rights or warrants to subscribe for or to
purchase any additional Preferred Shares or shares of any class or any other
securities, rights or options, (iii) to effect any reclassification of its
Preferred Shares (other than a reclassification involving only the subdivision
of outstanding Preferred Shares), (iv) to effect any consolidation or merger
into or with, or to effect any sale or other transfer (or to permit one or more
of its Subsidiaries to effect any sale or other transfer), in one or more
transactions, of 50% or more of the assets or earning power of the Company and
its Subsidiaries (taken as a whole) to, any other Person, (v) to effect the
liquidation, dissolution or winding up of the Company, or (vi) to declare or pay
any dividend on the Common Shares payable in Common Shares or to effect a
subdivision, combination or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares),
then, in each such case, the Company shall give to each holder of a Right
Certificate, in accordance with Section 26 hereof, a notice of such proposed
action, which shall specify the record date for the purposes of such share
dividend, or distribution of rights or warrants, or the date on which such
reclassification, consolidation, merger, sale, transfer, liquidation,
dissolution, or winding up is to take place and the date of participation
therein by the holders of the Common Shares and/or Preferred Shares, if any such
date is to be fixed, and such notice shall be so given in the case of any action
covered by clause (i) or (ii) above at least 10 days prior to the record date
for determining holders of the Preferred Shares for purposes of such action, and
in the case of any such other action, at least 10 days prior to the date of the
taking of such proposed action or the date of participation therein by the
holders of the Common Shares and/or Preferred Shares, whichever shall be the
earlier.

                                      -30-
<PAGE>
 
     (b)  In case any of the events set forth in Section 11(a)(ii) hereof shall
occur, then the Company shall as soon as practicable thereafter give to each
holder of a Right Certificate, in accordance with Section 26 hereof, a notice of
the occurrence of such event, which notice shall describe such event and the
consequences of such event to holders of Rights under Section 11(a)(ii) hereof.

     Section 26.  Notices.  Notices or demands authorized by this Agreement to
                  -------                                                     
be given or made by the Rights Agent or by the holder of any Right Certificate
to or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

               Cabot Industrial Trust
               Two Center Plaza, Suite 200
               Boston, Massachusetts 02108
               Attention:  Secretary

     Subject to the provisions of Section 21 hereof, any notice or demand
authorized by this Agreement to be given or made by the Company or by the holder
of any Right Certificate to or on the Rights Agent shall be sufficiently given
or made if sent by first-class mail, postage prepaid, addressed (until another
address is filed in writing with the Company) as follows:

               BankBoston, N.A.
               c/o Boston EquiServ Limited Partnership
               150 Royall Street
               Mail Stop 45-02-62
               Canton, Massachusetts  02021
               Attention: Client Administration

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

     Section 27.  Supplements and Amendments.  Prior to the Distribution Date
                  --------------------------                                 
and subject to the penultimate sentence of this Section 27, the Company may from
time to time supplement or amend this Agreement without the approval of any
holders of Right Certificates in order to cure any ambiguity, to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein, to shorten or lengthen any time period
hereunder, or to make any other provisions with respect to the Rights
(including, without limitation, changes to the Purchase Price) which the Company
may deem necessary or desirable, any such supplement or amendment to be
evidenced by a writing signed by the Company and the Rights Agent.  From and
after the Distribution Date and subject to the penultimate sentence of this
Section 27, the Company may from time to time supplement or amend this Agreement
without approval of any holders of Rights Certificates in order (i) to cure any
ambiguity, (ii) to 

                                      -31-
<PAGE>
 
correct or supplement any provision contained herein which may be defective or
inconsistent with any other provisions herein, (iii) to shorten or lengthen any
time period hereunder or (iv) to make any other provisions hereunder with
respect to the Rights which the Company may deem necessary or desirable and
which shall not adversely affect the interests of the holders of Rights
Certificates (other than an Acquiring Person or any Affiliate or Associate of
any Acquiring Person), provided, this Agreement may not be supplemented or
                       --------
amended to lengthen, pursuant to clause (iii) of this sentence, (A) a time
period relating to when the Rights may be redeemed at such time as the Rights
are not then redeemable or (B) any other time period unless such lengthening is
for the purpose of protecting, enhancing or clarifying the rights of, and/or the
benefits to, the holders of Rights (other than an Acquiring Person or an
Affiliate or Associate of an Acquiring Person). Upon the delivery of a
certificate from an appropriate officer of the Company which states that the
proposed supplement or amendment is in compliance with the terms of this Section
27, the Rights Agent shall execute such supplement or amendment. Notwithstanding
anything contained in this Agreement to the contrary, no supplement or amendment
shall be made which changes the Redemption Price, the Final Expiration Date, the
Purchase Price or the number of one one-hundredths of a share of Preferred Stock
for which a Right is exercisable; provided, however, that at any time prior to
                                  --------
(x) the existence of an Acquiring Person or (y) the date that a tender or
exchange offer by any Person is first published or sent or given within the
meaning of Rule 14d-2(a) of the General Rules and Regulations under the Exchange
Act if upon consummation thereof such Person would be an Acquiring Person, the
Board may amend this Agreement to increase the Purchase Price or extend the
Final Expiration Date. Prior to the Distribution Date, the interests of the
holders of Rights shall be deemed coincident with the interests of the holders
of Common Shares of the Company.

     Section 28.  Successors.  All the covenants and provisions of this
                  ----------                                           
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

     Section 29.  Benefits of this Agreement.  Nothing in this Agreement shall
                  --------------------------                                  
be construed to give to any Person other than the Company, the Rights Agent and
the registered holders of the Right Certificates (and, prior to the Distribution
Date, the Common Shares) any legal or equitable right, remedy or claim under
this Agreement; and this Agreement shall be for the sole and exclusive benefit
of the Company, the Rights Agent and the registered holders of the Right
Certificates (and, prior to the Distribution Date, the Common Shares).

     Section 30.  Severability.  If any term, provision, covenant or restriction
                  ------------                                                  
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected, impaired or invalidated.

     Section 31.  Governing Law.  This Agreement and each Right Certificate
                  -------------                                            
issued hereunder shall be deemed to be a contract made under the laws of the
State of Maryland and for all purposes shall be governed by and construed in
accordance with the laws of such State 

                                      -32-
<PAGE>
 
applicable to contracts to be made and performed entirely within such State,
except that those provisions of this Agreement affecting the rights, duties and
responsibilities of the Rights Agent shall be governed by and construed in
accordance with the law of the State of New York.

     Section 32.  Counterparts.  This Agreement may be executed in any number of
                  ------------                                                  
counterparts and each of such counterparts shall for all purposes be deemed to
be an original, and all such counterparts shall together constitute but one and
the same instrument.

     Section 33.  Descriptive Headings.  Descriptive headings of the several
                  --------------------                                      
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

     Section 34.  Determinations and Actions by the Board of Trustees.  The
                  ---------------------------------------------------      
Board of Trustees of the Company shall have the exclusive power and authority to
administer this Agreement and to exercise all rights and powers specifically
granted to the Trustees or the Company or as may be necessary or advisable in
the administration of this Agreement, including, without limitation, the right
and power to (a) interpret the provisions of this Agreement, and (b) make all
determinations deemed necessary or advisable for the administration of this
Agreement (including a determination to redeem or not redeem the Rights or to
amend this Agreement).  All such actions, interpretations and determinations
(including, for purpose of clause (b) above, all omissions with respect to the
foregoing) which are done or made by the Trustees in good faith, shall (x) be
final, conclusive and binding on the Company, the Rights Agent, the holders of
the Right Certificates and all other parties, and (y) not subject the Trustees
to any liability to the holders of the Right Certificates.

                                      -33-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and attested, all as of the day and year first above written.


                    CABOT INDUSTRIAL TRUST



                    By   /s/ Ferdinand Colloredo-Mansfeld
                         --------------------------------
                         Ferdinand Colloredo-Mansfeld
                         Chairman and Chief Executive Officer
 
Attest:


By   /s/ Neil E. Waisnor
     -------------------
     Neil E. Waisnor
     Secretary


                    BANKBOSTON, N.A.



                    By   /s/ Tyler Haynes
                         -----------------------------------
                         Name: Tyler Haynes
                               --------------------------
                         Title: Administration Manager
                                -------------------------

Attest:


By   /s/ Katherine Anderson
     -------------------------------
     Name:Katherine Anderson
          -----------------------
     Title: Administration Manager
            -----------------------

                                      -34-
<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------


                            CABOT INDUSTRIAL TRUST

                                    FORM OF
                            ARTICLES SUPPLEMENTARY
                                SERIES A JUNIOR
                        PARTICIPATING PREFERRED SHARES


     Cabot Industrial Trust, a Maryland real estate investment trust (the
"Company"), hereby certifies to the State Department of Assessments and Taxation
of Maryland pursuant to Section 8-203(b) of the Annotated Code of Maryland (the
"Code") that:

     FIRST: Under a power contained in Article 2, Section 1 of the Declaration
of Trust of the Company, the Board of Trustees, as required by Section 8-203(b)
of the Code, at a meeting duly called and held on June 11, 1998, has classified
1,000,000 unissued shares of the Company as Series A Junior Participating
Preferred Shares, with the following preferences, conversion and other rights,
voting powers, restrictions, limitations as to dividends and other
distributions, qualifications and terms and conditions of redemption, which upon
any restatement of the Declaration of Trust shall be made part of Article 2 of
the Declaration, with any necessary or appropriate changes to the enumeration
and lettering hereof:

                SERIES A JUNIOR PARTICIPATING PREFERRED SHARES

     Section 1. Designation and Amount. There shall be a series of preferred
                ----------------------                                       
shares of the Company, $0.01 par value per share, which shall be designated
"Series A Junior Participating Preferred Shares" (the "Series A Preferred
Shares"), and the number of shares constituting that series shall be 1,000,000.
Such number of shares may be increased or decreased by resolution of the Board
of Trustees and by the filing of articles supplementary in accordance with the
provisions of Title 8 of the Corporations and Associations Code of the State of
Maryland stating that such increase or reduction has been so authorized;
provided, however, that no decrease shall reduce the number of Series A
--------  -------                                                      
Preferred Shares to a number less than the number of Series A Preferred Shares
then outstanding plus the number of Series A Preferred Shares issuable upon
exercise of outstanding rights, options or warrants or upon conversion of
outstanding securities issued by the Company.

     Section 2.  Dividends and Distributions.
                 --------------------------- 

     (A) Subject to the prior and superior rights of the holders of any shares
of any class or series of preferred shares of the Company ranking prior and
superior to the Series A Preferred Shares with respect to dividends, the holders
of Series A Preferred Shares shall be entitled to receive, when, as and if
authorized by the Board of Trustees out of funds legally available for the
purpose, quarterly dividends payable in cash to holders of record on the last

<PAGE>
 
Business Day of January, April, July and October in each year (each such date
being referred to herein as a "Quarterly Dividend Payment Date") (commencing on
the first Quarterly Dividend Payment Date after the first issuance of a Series A
Preferred Share or fraction thereof) in an amount per share (rounded to the
nearest cent) equal to the greater of (a) $1.00 or (b) subject to the provision
for adjustment hereinafter set forth, 100 times the aggregate per share amount
of all cash dividends, and 100 times the aggregate per share amount (payable in
kind) of all non-cash dividends or other distributions other than a dividend
payable in Common Shares (hereinafter defined) or a subdivision of the
outstanding Common Shares (by a reclassification or otherwise), authorized on
the common shares of beneficial interest, par value $0.01 per share, of the
Company (the "Common Shares") since the immediately preceding Quarterly Dividend
Payment Date, or, with respect to the first Quarterly Dividend Payment Date,
since the first issuance of any Series A Preferred Share or fraction thereof.
In the event the Company shall at any time following June 11, 1998 (i) declare
any dividend on Common Shares payable in Common Shares, (ii) subdivide the
outstanding Common Shares or (iii) combine the outstanding Common Shares into a
smaller number of shares, then in each such case the amount to which holders of
Series A Preferred Shares were entitled immediately prior to such event under
clause (b) of the preceding sentence shall be adjusted by multiplying each such
amount by a fraction the numerator of which is the number of Common Shares
outstanding immediately after such event and the denominator of which is the
number of Common Shares that were outstanding immediately prior to such event.

     (B) The Company shall declare a dividend or distribution on the Series A
Preferred Shares as provided in paragraph (A) above at the time it declares a
dividend or distribution on the Common Shares (other than a dividend payable in
Common Shares).

     (C) No dividend or distribution (other than a dividend or distribution
payable in Common Shares) shall be paid or payable to the holders of Common
Shares unless, prior thereto, all accrued but unpaid dividends to the date of
that dividend or distribution shall have been paid to the holders of Series A
Preferred Shares.

     (D) Dividends shall begin to accrue and be cumulative on outstanding Series
A Preferred Shares from the Quarterly Dividend Payment Date next preceding the
date of issuance of such Series A Preferred Shares, unless the date of issuance
of such shares is prior to the record date for the first Quarterly Dividend
Payment Date, in which case dividends on such shares shall begin to accrue and
be cumulative from the date of issuance of such shares, or unless the date of
issuance is a Quarterly Dividend Payment Date or is a date after the record date
for the determination of holders of Series A Preferred Shares entitled to
receive a quarterly dividend and before such Quarterly Dividend Payment Date, in
either of which events such dividends shall begin to accrue and be cumulative
from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall
not bear interest.  Dividends paid on the Series A Preferred Shares in an amount
less than the total amount of such dividends at the time accrued and payable on
such shares shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding.  The Board of Trustees may fix a record date for
the determination of holders of Series A Preferred Shares entitled to receive
payment of a dividend or distribution declared thereon, which record date shall
be no more than 30 days prior to the date fixed for the payment thereof.

                                      -2-
<PAGE>
 
     Section 3.  Voting Rights.  The holders of Series A Preferred Shares shall
                 -------------                                                 
have the following voting rights:

     (A) Subject to the provision for adjustment hereinafter set forth, each one
one-hundredth of a Series A Preferred Share shall entitle the holder thereof to
one vote on all matters submitted to a vote of the shareholders of the Company.
In the event the Company shall at any time following June 11, 1998 (i) declare
any dividend on Common Shares payable in Common Shares, (ii) subdivide the
outstanding Common Shares or (iii) combine the outstanding Common Shares into a
smaller number of shares, then in each such case the number of votes per share
to which holders of Series A Preferred Shares were entitled immediately prior to
such event shall be adjusted by multiplying such number by a fraction the
numerator of which is the number of Common Shares outstanding immediately after
such event and the denominator of which is the number of Common Shares that were
outstanding immediately prior to such event.

     (B) Except as otherwise provided herein, the holders of Series A Preferred
Shares and the holders of Common Shares and any other shares of beneficial
interest of the Company having general voting rights shall vote together as one
class on all matters submitted to a vote of shareholders of the Company.

     (C)  

          (i)  Whenever, at any time or times, dividends payable on any Series A
     Preferred Shares shall be in arrears in an amount equal to at least six
     full quarterly dividends (whether or not declared and whether or not
     consecutive), the holders of record of the outstanding Series A Preferred
     Shares shall have the exclusive right, voting separately as a single class,
     to elect two Trustees of the Company at a special meeting of shareholders
     of the Company or at the Company's next annual meeting of shareholders, and
     at each subsequent annual meeting of shareholders, as provided below. At
     elections for such Trustees, the holders of Series A Preferred Shares shall
     be entitled to cast one vote for each one one-hundredth of a Series A
     Preferred Share held, subject to adjustment.

          (ii) Upon the vesting of such right of the holders of the Series A
     Preferred Shares, the maximum authorized number of members of the Board of
     Trustees shall automatically be increased by two and the two vacancies so
     created shall be filled by vote of the holders of the outstanding Series A
     Preferred Shares as hereinafter set forth.  A special meeting of the
     shareholders of the Company then entitled to vote shall be called by the
     Chairman, the President, any Senior Vice President or the Secretary of the
     Company, if requested in writing by the holders of record of not less than
     10% of the Series A Preferred Shares then outstanding.  At such special
     meeting, or, if no such special meeting shall have been called, then at the
     next annual meeting of shareholders of the Company, the holders of the
     Series A Preferred Shares shall elect, voting as above provided, two
     Trustees of the Company to fill the aforesaid vacancies created by the

                                      -3-
<PAGE>
 
     automatic increase in the number of members of the Board of Trustees.  At
     any and all such meetings for such election, the holders of a majority of
     the outstanding Series A Preferred Shares shall be necessary to constitute
     a quorum for such election, whether present in person or by proxy, and such
     two Trustees shall be elected by the vote of at least a plurality of shares
     held by such shareholders present or represented at the meeting.  Any
     Trustee elected by holders of Series A Preferred Shares pursuant to this
     Section may be removed at any annual or special meeting, by vote of a
     majority of the shareholders voting as a class who elected such Trustee,
     with or without cause.  In case any vacancy shall occur among the Trustees
     elected by the holders of the Series A Preferred Shares pursuant to this
     Section, such vacancy may be filled by the remaining Trustee so elected, or
     his successor then in office, and the Trustee so elected to fill such
     vacancy shall serve until the next meeting of shareholders for the election
     of Trustees. After the holders of the Series A Preferred Shares shall have
     exercised their right to elect Trustees in any default period and during
     the continuance of such period, the number of Trustees shall not be further
     increased or decreased except by vote of the holders of Series A Preferred
     Shares as herein provided or pursuant to the rights of any equity
     securities ranking senior to or pari passu with the Series A Preferred
                                     ---- -----                            
     Shares.

          (iii)  The right of the holders of the Series A Preferred Shares,
     voting separately as a class, to elect two members of the Board of Trustees
     of the Company as aforesaid shall continue until, and only until, such time
     as all arrears in dividends (whether or not declared) on the Series A
     Preferred Shares shall have been paid or declared and set apart for
     payment, at which time such right shall terminate, except as herein or by
     law expressly provided, subject to revesting in the event of each and every
     subsequent default of the character above-mentioned.  Upon any termination
     of the right of the holders of the Series A Preferred Shares as a class to
     vote for Trustees as herein provided, the term of office of all Trustees
     then in office elected by the holders of Series A Preferred Shares pursuant
     to this Section shall terminate immediately.  Whenever the term of office
     of the Trustees elected by the holders of the Series A Preferred Shares
     pursuant to this Section shall terminate and the special voting powers
     vested in the holders of the Series A Preferred Shares pursuant to this
     Section shall have expired, the maximum number of members of the Board of
     Trustees of the Company shall be such number as may be provided for in the
     Bylaws of the Company irrespective of any increase made pursuant to the
     provisions of this Section.

     (D) Except as otherwise provided herein or required by law, holders of
Series A Preferred Shares shall have no special voting rights and their consent
shall not be required (except to the extent they are entitled to vote with
holders of Common Shares as provided herein) for taking any corporate action.

                                      -4-
<PAGE>
 
     Section 4.  Certain Restrictions.
                 -------------------- 

     (A) Whenever any quarterly dividends or other dividends or distributions
payable on the Series A Preferred Shares as provided in Section 2 are in
arrears, then, thereafter and until all accrued and unpaid dividends and
distributions, whether or not declared, on Series A Preferred Shares outstanding
shall have been paid in full, the Company shall not:

          (i) declare or pay dividends on, make any other distributions on, or
     redeem or purchase or otherwise acquire for consideration any shares
     ranking junior (either as to dividends or upon liquidation, dissolution or
     winding up) to the Series A Preferred Shares, other than dividends paid or
     payable in such junior shares;

          (ii) declare or pay dividends on or make any other distributions on
     any shares ranking on a parity (either as to dividends or upon liquidation,
     dissolution or winding up) with the Series A Preferred Shares, except
     dividends paid ratably on the Series A Preferred Shares and all such parity
     shares on which dividends are payable or in arrears in proportion to the
     total amounts to which the holders of all such shares are then entitled;

          (iii)  redeem or purchase or otherwise acquire for consideration
     shares ranking on a parity (either as to dividends or upon liquidation,
     dissolution or winding up) with the Series A Preferred Shares, provided
     that the Company may at any time redeem, purchase or otherwise acquire any
     such parity shares in exchange for shares of the Company ranking junior
     (either as to dividends or upon dissolution, liquidation or winding up) to
     the Series A Preferred Shares; or

          (iv) purchase or otherwise acquire for consideration any Series A
     Preferred Shares, except in accordance with a purchase offer made in
     writing or by publication (as determined by the Board of Trustees) to all
     holders of such shares upon such terms as the Board of Trustees, after
     consideration of the respective annual dividend rates and other relative
     rights and preferences of the respective series and classes, shall
     determine in good faith will result in fair and equitable treatment among
     the respective series or classes.

     (B) The Company shall not permit any subsidiary of the Company to purchase
or otherwise acquire for consideration any shares of the Company unless the
Company could, under paragraph (A) of this Section, purchase or otherwise
acquire such shares at such time and in such manner.

     Section 5.  Reacquired Shares.  Any Series A Preferred Shares purchased or
                 -----------------                                             
otherwise acquired by the Company in any manner whatsoever shall become
authorized but unissued shares of beneficial interest and may be reissued as
Common Shares or as part of a new series of preferred shares to be created by
resolution or resolutions of the Board of Trustees, subject to the conditions
and restrictions on issuance set forth herein.

                                      -5-
<PAGE>
 
     Section 6.  Liquidation, Dissolution or Winding Up.  (A)  Upon any
                 --------------------------------------                
voluntary liquidation, dissolution or winding up of the Company, no distribution
shall be made to the holders of shares ranking junior (either as to dividends or
upon liquidation, dissolution or winding up) to the Series A Preferred Shares
unless, prior thereto, the holders of Series A Preferred Shares shall have
received $1.00 per share, plus an amount equal to accrued and unpaid dividends
and distributions thereon, whether or not declared, to the date of such payment
(the "Series A Liquidation Preference").  Following the payment of the full
amount of the Series A Liquidation Preference, no additional distributions shall
be made to the holders of Series A Preferred Shares unless, prior thereto, the
holders of Common Shares shall have received an amount per share (the "Common
Adjustment") equal to the quotient obtained by dividing (i) the Series A
Liquidation Preference by (ii) 100 (as appropriately adjusted as set forth in
subparagraph C below to reflect such events as share splits, share dividends and
recapitalizations with respect to the Common Shares) (such number in clause
(ii), the "Adjustment Number"). Following the payment of the full amount of the
Series A Liquidation Preference and the Common Adjustment in respect of all
outstanding Series A Preferred Shares and Common Shares, respectively, holders
of Series A Preferred Shares and holders of Common Shares shall receive their
ratable and proportionate share of the remaining assets to be distributed in the
ratio, on a per share basis, of the Adjustment Number to 1 with respect to such
Series A Preferred Shares and Common Shares, on a per share basis, respectively.

     (B) In the event, however, that there are not sufficient assets available
to permit payment in full of the Series A Liquidation Preference and the
liquidation preferences of all other series of preferred shares, if any, which
rank on a parity with the Series A Preferred Shares, then such remaining assets
shall be distributed ratably to the holders of the Series A Preferred Shares and
such parity shares in proportion to their respective liquidation preferences.

     (C) In the event the Company shall at any time following June 11, 1998 (i)
declare any dividend on Common Shares payable in Common Shares, (ii) subdivide
the outstanding Common Shares or (iii) combine the outstanding Common Shares
into a smaller number of shares, then in each such case the Adjustment Number in
effect immediately prior to such event shall be adjusted by multiplying such
Adjustment Number by a fraction the numerator of which is the number of Common
Shares outstanding immediately after such event and the denominator of which is
the number of Common Shares that were outstanding immediately prior to such
event.

     Section 7.  Consolidation, Merger, etc.  In case the Company shall enter
                 ---------------------------                                 
into any consolidation, merger, combination or other transaction in which the
Common Shares are exchanged for or changed into other shares or securities, cash
and/or any other property, then in any such case, the Series A Preferred Shares
shall at the same time be similarly exchanged or changed in an amount per share
(subject to the provision for adjustment hereinafter set forth) equal to 100
times the aggregate amount of shares, securities, cash and/or any other property
(payable in kind), as the case may be, into which or for which each Common Share
is exchanged or changed.  In the event the Company shall at any time (i) declare
any dividend on Common Shares payable in Common Shares, (ii) subdivide the
outstanding Common Shares or (iii) 

                                      -6-
<PAGE>
 
combine the outstanding Common Shares into a smaller number of shares, then in
each such case the amount set forth in the preceding sentence with respect to
the exchange or change of Series A Preferred Shares shall be adjusted by
multiplying such amount by a fraction the numerator of which is the number of
Common Shares outstanding immediately after such event and the denominator of
which is the number of Common Shares that were outstanding immediately prior to
such event.

     Section 8.  Redemption.  The Series A Preferred Shares shall not be
                 ----------                                             
redeemable by the Company.  The preceding sentence shall not limit the ability
of the Company to purchase or otherwise deal in such shares to the extent
permitted by law.

     Section 9.  Ranking.  The Series A Preferred Shares shall rank junior to
                 -------                                                     
all other series of the Company's preferred shares (whether with or without par
value) as to the payment of dividends and the distribution of assets, unless the
terms of any such series shall provide otherwise.

     Section 10.  Amendment.  Neither the Company's Declaration of Trust nor any
                  ---------                                                     
Articles Supplementary relating to the Series A Preferred Shares shall be
amended in any manner which would materially and adversely alter or change the
preferences, rights or other terms of the Series A Preferred Shares without the
affirmative vote of the holders of a majority or more of the outstanding Series
A Preferred Shares, voting separately as a class.

     Section 11.  Fractional Shares.  Series A Preferred Shares may be issued in
                  -----------------                                             
fractions of a share that are integral multiples of one-one hundredth of a
share, which shall entitle the holder, in proportion to such holder's fractional
shares, to exercise voting rights, receive dividends and participate in
distributions and to have the benefit of all other rights of holders of Series A
Preferred Shares.

     SECOND:  These Articles Supplementary have been approved by the Board of
Trustees in the manner and by the vote required by law.

     THIRD:  The undersigned Chairman of the Board acknowledges these Articles
Supplementary to be the act of the Company and, as to all matters or facts
required to be verified under oath, such officer acknowledges that to the best
of his knowledge, information and belief, these matters and facts are true in
all material respects and that this statement is made under the penalties for
perjury.

                                      -7-
<PAGE>
 
     IN WITNESS WHEREOF, these Articles Supplementary have been duly executed by
the undersigned officer this 11th day of June, 1998.

                    CABOT INDUSTRIAL TRUST



                    By:
                       ________________________________________
                    Name:  Ferdinand Colloredo-Mansfeld
                    Title: Chairman and Chief Executive Officer

 
 
 

                                      -8-
<PAGE>
 
                                                                       EXHIBIT B
                                                                       ---------

                          [Form of Right Certificate]



Certificate No. R-                                ________ Rights

     NOT EXERCISABLE AFTER JUNE 11, 2008 OR EARLIER IF THE RIGHTS EXPIRE UNDER
     CERTAIN CIRCUMSTANCES OR ARE EXCHANGED OR REDEEMED BY THE COMPANY.  THE
     RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF THE COMPANY, AT $0.01
     PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER CERTAIN
     CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON (AS SUCH
     TERM IS DEFINED IN THE RIGHTS AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH
     RIGHTS MAY BECOME NULL AND VOID.  [THE RIGHTS REPRESENTED BY THIS
     CERTIFICATE ARE OR WERE BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN
     ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON (AS
     SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT).  ACCORDINGLY, THIS RIGHT
     CERTIFICATE AND THE RIGHTS REPRESENTED HEREBY MAY BECOME VOID IN THE
     CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF SUCH AGREEMENT.]*


                               Right Certificate

                             CABOT INDUSTRIAL TRUST

     This certifies that                              , or registered assigns,
is the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Rights Agreement, dated as of June 11, 1998 (the "Rights Agreement"),
between Cabot Industrial Trust, a Maryland real estate investment trust (the
"Company"), and BankBoston, N.A. (the "Rights Agent") to purchase from the
Company at any time after the Distribution Date (as such term is defined in the
Rights Agreement) and prior to 5:00 p.m. (Eastern time) on June 11, 2008 or
notice of redemption or exchange at the office of the Rights Agent (or its
successors as Rights Agent) designated for such purpose, one one-hundredth of a
fully paid, non-assessable Series A Junior Participating Preferred Share (a


--------------------------------
     *  The portion of the legend in brackets shall be inserted only if 
        applicable and shall replace the preceding sentence.

                                      
<PAGE>
 
"Preferred Share") of the Company, at a purchase price of $85.00 per one one-
hundredth of a Preferred Share (the "Purchase Price"), upon presentation and
surrender of this Right Certificate with the appropriate Form of Election to
Purchase and related Certificate duly executed.  The number of Rights evidenced
by this Right Certificate (and the number of Preferred Shares which may be
purchased upon exercise thereof) set forth above, and the Purchase Price per
Preferred Share set forth above, are the number and Purchase Price as of June
11, 1998, based on the Preferred Shares as constituted at such date.
Capitalized terms not defined in this Right Certificate that are defined in the
Rights Agreement shall have the meanings ascribed to them in the Rights
Agreement.

     Upon the occurrence of a Triggering Event, if the Rights evidenced by this
Right Certificate are beneficially owned by (i) an Acquiring Person or an
Affiliate or Associate of any such Acquiring Person, (ii) under certain
circumstances specified in the Rights Agreement, a transferee of any such
Acquiring Person, Associate or Affiliate, or (iii) under certain circumstances
specified in the Rights Agreement, a transferee of a person who, after such
transfer, became an Acquiring Person, or an Affiliate or Associate of an
Acquiring Person, such Rights shall become null and void and no holder hereof
shall have any right with respect to such Rights from and after the occurrence
of any such Triggering Event.

     As provided in the Rights Agreement, the Purchase Price and the number and
kind of Preferred Shares or other securities, which may be purchased upon the
exercise of the Rights evidenced by this Right Certificate are subject to
modification and adjustment upon the happening of certain events.

     This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Right Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under certain circumstances specified in such Rights Agreement.
Copies of the Rights Agreement are on file at the above-mentioned office of the
Rights Agent and are also available upon written request to the Rights Agent.

     This Right Certificate, with or without other Right Certificates, upon
surrender at the principal corporate trust office of the Rights Agent, may be
exchanged for another Right Certificate or Right Certificates of like tenor and
date evidencing Rights entitling the holder to purchase a like aggregate number
of Preferred Shares as the Rights evidenced by the Right Certificate or Right
Certificates surrendered shall have entitled such holder to purchase.  If this
Right Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Right Certificate or Right Certificates
for the number of whole Rights not exercised.

                                      -2-
<PAGE>
 
     Subject to the provisions of the Rights Agreement, the Rights evidenced by
this Certificate may be redeemed by the Company at its option at a redemption
price of $0.01 per Right at any time prior to the earlier of (i) the close of
business on the tenth day (or such specified or unspecified later date as may be
determined by action of the Board of Trustees prior to such tenth day) following
the Shares Acquisition Date or (ii) the close of business on the Final
Expiration Date.

     No fractional Preferred Shares will be issued upon the exercise of any
Right or Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

     No holder of this Right Certificate, as such, shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of Preferred Shares or
of any other securities of the Company which may at any time be issuable on the
exercise hereof, nor shall anything contained in the Rights Agreement or herein
be construed to confer upon the holder hereof, as such, any of the rights of a
shareholder of the Company or any right to vote for the election of trustees or
upon any matter submitted to shareholders at any meeting thereof, or to give or
withhold consent to any trust action, or, to receive notice of meetings or other
actions affecting shareholders (except as provided in the Rights Agreement), or
to receive dividends or subscription rights, or otherwise, until the Right or
Rights evidenced by this Right Certificate shall have been exercised as provided
in the Rights Agreement.

     This Right Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

     WITNESS the facsimile signature of the proper officers of the Company and
its seal.

Dated as of _______________ __, 19__

                                          CABOT INDUSTRIAL TRUST

                                          By:
                                             -----------------------------
                                               Name:
                                               Title:

Attest:   (SEAL)


------------------------------- 
Name:
Title:


Countersigned:

BANKBOSTON, N.A.




By:
     ----------------------------------
     Authorized Signature

                                      -3-
<PAGE>
 
                  [Form of Reverse Side of Right Certificate]

                              FORM OF ASSIGNMENT
                              ------------------

    (To be executed by the registered holder if such holder desires to transfer
    the Right Certificate.)

FOR VALUE RECEIVED
                   -------------------------------------------------------------
hereby sells, assigns and transfers unto
                                         ---------------------------------------
                 (Please print name and address of transferee)

this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint ______________________ Attorney,
to transfer the within Right Certificate on the books of the within-named
Company, with full power of substitution.

Date:             , 19
      ------------    ---           ----------------------------------------
                                    Signature

Signature Guaranteed:
                                  Certificate
                                  -----------

     The undersigned hereby certifies by checking the appropriate boxes that:

     (1) this Rights Certificate [ ] is [ ] is not being sold, assigned and
transferred by or on behalf of a Person who is or was an Acquiring Person or an
Affiliate or Associate of any such Acquiring Person (as such terms are defined
pursuant to the Rights Agreement);

     (2) after due inquiry and to the best knowledge of the undersigned, it [ ]
did [ ] did not acquire the Rights evidenced by this Rights Certificate from any
Person who is, was or subsequently became an Acquiring Person or an Affiliate or
Associate of an Acquiring Person.

Date:               , 19
     ---------------    ---         -------------------------------------
                                    Signature

                                    NOTICE
                                    ------

     The signature to the foregoing Assignment and Certificate must correspond
to the name as written upon the face of this Right Certificate in every
particular, without alteration or enlargement or any change whatsoever.

<PAGE>
 
                         FORM OF ELECTION TO PURCHASE
                         ----------------------------

                        (To be executed if holder desires
                        to exercise Rights evidenced by 
                        the Right Certificate.)

To:  CABOT INDUSTRIAL TRUST

     The undersigned hereby irrevocably elects to exercise _______ Rights
evidenced by this Right Certificate to purchase the Preferred Shares issuable
upon the exercise of the Rights (or such other securities of the Company or of
any other person which may be issuable upon the exercise of the Rights) and
requests that certificates for such shares be issued in the name of:

Please insert social security
or other identifying number:
                            ----------------------------------------------------

--------------------------------------------------------------------------------
                        (Please print name and address)

     If such number of Rights shall not be all the Rights evidenced by this
Right Certificate, a new Right Certificate for the balance of such Rights shall
be registered in the name of and delivered to:

Please insert social security
or other identifying number:
                             ---------------------------------------------------

--------------------------------------------------------------------------------
                        (Please print name and address)



Date:             , 19
     -------------    ---           -------------------------------------
                                    Signature

<PAGE>
 
Signature Guaranteed:

                                  Certificate
                                  -----------

     The undersigned hereby certifies by checking the appropriate boxes that:

     (1) the Rights evidenced by this Rights Certificate [ ] are [ ] are not 
being exercised by or on behalf of a Person who is or was an Acquiring Person or
an Affiliate or Associate of any such Acquiring Person (as such terms are
defined pursuant to the Rights Agreement);

     (2) after due inquiry and to the best knowledge of the undersigned, it [ ]
did [ ] did not acquire the Rights evidenced by this Rights Certificate from any
Person who is, was or became an Acquiring Person or an Affiliate or Associate of
an Acquiring Person.

Dated:         , 19
      ---------    ---              ----------------------------------------
                                    Signature


                                    NOTICE
                                    ------

     The signature to the foregoing Election to Purchase and Certificate must
correspond to the name as written upon the face of this Right Certificate in
every particular, without alteration or enlargement or any change whatsoever.