CALL AND PUT OPTION AGREEMENT

         THIS CALL AND PUT OPTION AGREEMENT (the "Agreement") is entered into as
of the 28th day of April, 2003, by and among the parties listed on Schedule A
hereto (referred to collectively as the "Class A Partners" and individually, a
"Class A Partner"), and PREIT ASSOCIATES, L.P., a Delaware limited partnership
(the "UPREIT"), with joinder by PR New Castle LLC, a Pennsylvania limited
liability company (the "General Partner").

                                   BACKGROUND:
         The Class A Partners are all of the "Class A Limited Partners" of New
Castle Associates, a Pennsylvania limited partnership (the "Partnership"). The
UPREIT is the "Class B Limited Partner" of the Partnership. The General Partner
is the sole general partner of the Partnership.

         The Partnership is governed by an Amended and Restated Limited
Partnership Agreement dated April 28, 2003 (the "Partnership Agreement"), a copy
of which is attached hereto as Schedule B.

         The Class A Partners hold limited partnership interests (a partnership
interest being referred to separately as an "Interest" and multiple Interests
being referred to as "Interests") as listed on Schedule A hereto. Such aggregate
Interests of the Class A Partners are referred to herein as the "Retained
Interests" and reflect a downward adjustment on account of the "UPREIT Special
Capital Contribution," as that term is defined in the Partnership Agreement.

         A portion of the Interests of the UPREIT and the General Partner were
acquired from the Class A Partners pursuant to a Contribution Agreement (the
"Contribution Agreement," a copy of which is attached hereto as Schedule C and
which is incorporated herein by reference) dated April 22, 2003 by and among the
Class A Partners, certain prior limited partners of the Partnership and certain
general partners of prior limited partners of the Partnership, the UPREIT, and
Pennsylvania Real Estate Investment Trust (the "Trust").




         The Class A Partners and the UPREIT desire to provide a mechanism under
which the UPREIT will have the right to acquire from the Class A Partners, and
require the Class A Partners to contribute to the UPREIT, the Retained Interests
pursuant to and in accordance with the terms and conditions of this Agreement
(hereinafter defined and referred to as the "Call").

         The Class A Partners and the UPREIT further desire to provide a
mechanism under which, if the Call is not exercised, and following the
expiration of a specified time period thereafter, the Class A Partners will have
the right to contribute to, and require the UPREIT to acquire from the Class A
Partners, all or some of the Retained Interests pursuant to and in accordance
with the terms and conditions of this Agreement (hereinafter defined and
referred to as the "Put").

         NOW THEREFORE, in consideration of the mutual promises and agreements
herein contained, and intending to be legally bound hereby, the parties hereto
agree as follows:

1. Call and Put.

         (a) Call Period. For the period commencing on the date (the "Call
Commencement Date") which is one (1) year plus two (2) business days after the
date hereof, and ending on the later of (x) the one hundred eightieth (180th)
day after the Call Commencement Date, or (y) the tenth (10th) day following
delivery of the Call Reminder Notice (such period being referred to as the "Call
Period"), the UPREIT shall have the right (the "Call") to acquire from the Class
A Partners, and upon exercise of the Call the Class A Partners shall be required
to contribute to the UPREIT, all (and not less than all) of the Retained
Interests for the Call Consideration (as hereinafter defined). The "Call
Reminder Notice" means a notice from the Class A Partners to the UPREIT (given
not earlier than 30 days prior to the expiration of the 180 day period following
the Call Commencement Date) that such 180 day period is about to, or has,
expired.



                                       2


         (b) Put Period. If the Call is not exercised within the Call Period,
then for the period commencing on the date (the "Put Commencement Date") which
is five (5) years after the date hereof, and ending on the later of (x) the one
hundred eightieth (180th) day after the Put Commencement Date, or (y) the tenth
(10th) day following delivery of the Put Reminder Notice (such period being
referred to as the "Put Period"), the Class A Partners (or such of the Class A
Partners as may elect to exercise their rights under this subparagraph (b),
without the requirement for all of the Class A Partners to do so) shall have the
right (the "Put") to require the UPREIT to acquire, and upon exercise of the Put
the Upreit shall be required to acquire by contribution from such Class A
Partners, all of the Retained Interests owned by the exercising Class A Partners
for the Put Consideration (as hereinafter defined) allocable to such Class A
Partners. The "Put Reminder Notice" means a notice from the UPREIT to the Class
A Partners (given not earlier than 30 days prior to the expiration of the 180
day period following the Put Commencement Date) that such 180 day period is
about to, or has, expired.

         (c) Closing; Consideration. The date on which the Call or the Put shall
be consummated (i.e., when the Retained Interests shall be contributed to the
UPREIT and the Consideration shall be paid), is herein referred to as the
"Closing" or the "Closing Date". The applicable consideration to be paid at the
Closing for the Call or the Put, as the case may be (i.e., the Call
Consideration or the Put Consideration) is referred to herein as the
"Consideration".

         (d) Units. As used herein, a "Unit" means a Class A Unit or a Class B
Unit of the UPREIT as defined and described in the first Amended and Restated
Agreement of Limited Partnership of Preit Associates, L.P. dated September 30,
1997, as amended through October 13, 1998 (as amended, the "UPREIT Partnership
Agreement," a copy of which is attached hereto as Schedule D).



                                       3


         (e) Call Consideration; UPREIT Units. The "Call Consideration" means,
as to each of the separate Retained Interests of a Class A Partner, the
specified number of Units allocable to such Class A Partner (i.e., Class A Units
or Class B Units) as delineated on Schedule E attached hereto, subject to the
adjustment (if any) set forth in subsection (g) below.

         (f) Put Consideration. The Put Consideration means, with respect to a
the Retained Interest of a particular Class A Partner who has exercised the Put,
the specified number of Units allocable to such Class A Partner (i.e., Class A
Units or Class B Units) as delineated on Schedule F attached hereto, subject to
the adjustment (if any) set forth in subsection (g) below.

         (g) Adjustment to Consideration. The Call Consideration or Put
Consideration set forth above shall be adjusted as follows:

         (i) If, after the date hereof, there shall occur any recapitalization,
         unit division, reverse division, unit re-issuance or any other
         transaction involving the UPREIT or the Trust whereby a Class A Unit or
         a Class B Unit (as it exists on the date hereof) shall be reconstituted
         as a different number of Class A Units or Class B Units, respectively,
         and/or as a specified number of units having a different class or
         designation (in each case subject to the necessary requirements
         specified in the UPREIT Partnership Agreement), or if there shall occur
         any merger, consolidation or other transaction involving the UPREIT
         and/or the Trust whereby specified interests or units are substituted
         for a Class A Unit or a Class B Unit (or for the reconstituted Units
         determined as aforesaid), then for purposes of computing the
         Consideration, such reconstituted or substituted number of Class A
         Units, Class B Units and/or specified other Units or interests shall be
         substituted for each Class A Unit or Class B Unit, as the case may be,
         otherwise constituting a part of the Consideration. Any such
         substitution shall be accomplished in a manner that neither increases
         nor decreases the value of the Units to be received by the Contributors
         as compared to other holders of Class A or Class B Units under the
         UPREIT Partnership Agreement.



                                       4


         (ii) Notwithstanding anything to the contrary set forth herein, as to
         any Class A Partner who is not an "accredited investor," as such term
         is defined under Regulation D promulgated pursuant to the 1933
         Securities Act (the "Act"), in lieu of any Units which would otherwise
         be issuable to such Class A Partner pursuant to this Agreement, the
         Consideration shall, at the sole option and discretion of the UPREIT,
         be an amount of cash equal to the product of (i) the number of Units
         otherwise issuable to such Class A Partner and (ii) the Average Closing
         Price (as that term is defined in Section 3.1 (a) of the Contribution
         Agreement, calculated as of the relevant date of Closing for the Put or
         Call, as the case may be) attributable to the Units in question (i.e.,
         the cash equivalent of such Units based upon the average closing price
         of a share of the publicly traded beneficial interests corresponding to
         the Units during the 10 day period preceding the Closing).

         (iii) If applicable, a further adjustment shall be made to the
         Consideration to reflect any differences in distributions to the Class
         A Partners made under the Partnership Agreement as compared with
         distributions accrued or accruing with respect to the Units.

         (iv) If at the time of Closing for the Put or Call there is any balance
         of Unpaid Preferred Return under the Partnership Agreement due to the
         Class A Partner whose interest is being acquired, the UPREIT shall
         deliver cash or Units having a fair market value equal to such Unpaid
         Preferred Return as additional consideration. If the UPREIT elects to
         deliver Units, they shall be valued at the mean of the high and low
         trading price on the day immediately prior to the date of payment. Upon
         receipt of the payment or transfer required herein, all of the Class A
         Partner's interest in the Unpaid Preferred Return shall be deemed
         transferred to the UPREIT.

                                       5


         (v) If, between the date hereof and the date of Closing for the Call or
         the Put, there have been any distributions under the Partnership
         Agreement of Net Capital Proceeds to a Class A Partner whose interest
         is being acquired, then the Consideration payable to such Class A
         Partner shall be reduced by the aggregate amount of such distributions.
         Such reduction shall be calculated by valuing the Units at the mean of
         the high and low trading price on the day immediately prior to the date
         of payment.

2. Exercise of Call or Put; Closing.

         (a) Call Notice. If the UPREIT elects to exercise the Call, the UPREIT
shall do so by providing the Class A Partners written notice of such desire at
any time within the Call Period ("Call Notice"). If the Call Notice is given
within the Call Period, the Class A Partners shall be required to contribute all
of the Retained Interests to the UPREIT for the Consideration allocable to the
Class A Partners, at the Closing.

         (b) Put Notice. If one or more of the Class A Partners elect to
exercise the Put, such Class A Partner(s) shall do so by providing the UPREIT
with written notice of such desire at any time within the Put Period ("Put
Notice"). If the Put Notice is given within the Put Period, the UPREIT shall be
required to acquire all of the Retained Interests of all of the Class A Partners
who have given the Put Notice, for the Consideration allocable to such Class A
Partners, at the Closing.

         (c) Closing Date. Following the delivery of the Call Notice, the
Closing shall occur on the later to occur of (x) fifteen (15) days following the
date of the Call Notice, or (y) the first business day following the next
quarterly "ex-dividend" date for the common shares of beneficial interest of the
Trust ("Trust Shares") following the giving of the Call Notice. If one or more
Class A Partners shall deliver the Put Notice, there shall in all cases be only
one Closing for all Retained Interests to be acquired pursuant to the Put; and
therefore, unless otherwise agreed by all of the Class A Partners and the
UPREIT, the Closing for the Put shall occur on the first business day following
the next quarterly "ex-dividend" date for the Trust Shares following the
expiration of the Call Period. Closing shall occur at the offices of the UPREIT,
Philadelphia, Pennsylvania.



                                       6


3. Closing Deliveries.

         (a) Class A Partner Deliveries. At the Closing for the Put or Call, as
the case may be, each Class A Partner who is required to contribute its
interests to the UPREIT shall execute and deliver to the UPREIT:

         (i) an absolute and unconditional assignment of its Retained Interest
         and all rights relating thereto, free and clear of all liens, claims
         and encumbrances of any type or nature, by documentation substantially
         similar to that utilized for the contribution of partnership interests
         under the Contribution Agreement,

         (ii) certificates of good standing as of a current date for each such
         Class A Partner, certified by the Secretary of State or corresponding
         certifying authority,

         (iii) Uniform Commercial Code financing statement searches from the
         secretaries of state in which each such Class A Partner maintains its
         place(s) of business, disclosing no grant of a security interest in the
         Retained Interests,

         (iv) an opinion of counsel to each such Class A Partner in form and
         substance reasonably satisfactory to the UPREIT, relating to the
         authorization and enforceability of the documents and instruments
         executed and delivered by such Class A Partner,

         (v) counterpart signature pages and/or related certificates to confirm
         such Class A Partner's agreement to become a limited partner in the
         UPREIT and to be bound by the UPREIT Partnership Agreement, as it may
         hereafter be amended through the date of Closing, including without
         limitation any amendment deemed necessary by the UPREIT to confirm and
         authorize the issuance of the Units (provided that no such future
         amendment shall materially impair the attributes of the Units as
         compared to the existing Units heretofore acquired by the Class A
         Partners in the UPREIT pursuant to the Contribution Agreement),

                                       7


         (vi) a written restatement, representation and warranty ("Updated
         Warranties") as to the truth and accuracy of all of the Basic
         Warranties (as defined in subsection (b) below) as of the Closing Date,
         which shall survive Closing, with the further understanding that any
         disclosed qualifications or exclusions to the Updated Warranties shall
         be known as "Warranty Exceptions" and shall be subject to the
         provisions of Section 7(a) below, and

         (vii) such other documents and instruments as the UPREIT may reasonably
         request to effectuate or evidence the transactions contemplated under
         this Agreement.

         (b) Basic Warranties. As used herein, the "Basic Warranties" means the
warranties, certifications and representations, collectively, of the Class A
Partners (therein designated as the "Contributors") under Section 4.1 of the
Contribution Agreement. By way of clarification, the Updated Warranties shall
include all matters set forth in Section 4.1 of the Contribution Agreement
interpreted and construed as if the partnership interests therein referred to
were the Retained Interests, as if the "Class A Partner Transaction Documents"
referred to the documents and instruments to be executed and delivered by the
Class A Partners at Closing under this Agreement, and as if all investment
representations of the "Class A Partners" were made by the Class A Partners with
respect to the Units to be issued pursuant to this Agreement.

         (c) UPREIT Deliveries. At the Closing for the Put or Call, as the case
may be, the UPREIT shall execute and deliver to each Class A Partner who is
required to contribute its interests to the UPREIT:



                                       8


         (i) the Units to be delivered to such Class A Partner at Closing as set
         forth in this Agreement, or the cash amount in lieu thereof if Section
         1(g)(ii) hereof is applicable;

         (ii) any cash or Units required under Section 1(g)(iv);

         (iii) a counterpart execution page of the documents referred to in
         Section 3(a)(i) above;

         (iv) an agreement whereby the UPREIT shall covenant that, as owner of
         the controlling interests in the general partner of New Castle, it
         shall not permit the Replacement Property (as defined in the
         Contribution Agreement) or the Retained Interests to be disposed of for
         a period of eight (8) years following the closing under the
         Contribution Agreement in such manner as to cause such Class A Partners
         to recognize taxable income and that any such disposition within such
         time period must be pursuant to a tax-free exchange under Section 1031
         of the Internal Revenue Code or other tax-free disposition; provided
         that such disposition shall be permitted in a taxable transaction if
         such Class A Partners are paid an amount sufficient to reimburse them
         for any tax liability resulting from such transfer by reason of Section
         704(c) of the Internal Revenue Code, together with all taxes payable on
         such reimbursement; and

         (v) An agreement whereby the UPREIT will agree to cooperate in good
         faith with the Class A Partners whose interests are being acquired, in
         executing such documentation as may be required (such as limited
         guarantees of indebtedness by the Class A Partners) to avoid
         recognition of income or gain to such Class A Partners by reason of a
         constructive distribution to them under Section 752 of the Internal
         Revenue Code relating to relief from liabilities.


                                       9


         4. Failure to Purchase. The parties hereto acknowledge and agree that
following the creation of a binding contract as a result of the delivery of the
Call Notice or Put Notice in accordance with this Agreement, money damages alone
would not be a sufficient remedy to a party for the failure of another party to
consummate the transfer of the Retained Interests as set forth in this
Agreement, and that irreparable harm would result to the impaired party if such
obligations were not specifically enforced. Accordingly, all parties agree that
their obligations hereunder shall be enforceable by a decree of specific
performance issued by a court of competent jurisdiction, and that appropriate
injunctive relief may be applied for and granted in connection therewith, in
addition to the pursuit of applicable money damages.

         5. Transfer Restrictions. The parties acknowledge and agree that the
Retained Interests are subject to transfer restrictions as set forth in the
Partnership Agreement. Without limiting such restrictions, between the date
hereof and the expiration of the Put Period, except with the prior written
consent of the UPREIT, no Class A Partner shall sell, assign, transfer or
otherwise encumber all or any portion of the Retained Interests or any rights
relating to the Retained Interests, whether voluntarily, by operation of law or
otherwise, including without limitation a transfer by reason of any merger,
division or consolidation, and any such sale, assignment, transfer or
encumbrance shall be void. By its joinder herein, the General Partner
acknowledges and consents to such restrictions and agrees that no such transfer
shall be approved except with the consent of the UPREIT.

6. Representations and Warranties.

         (a) Class A Partners. As a several and not a joint obligation, each of
the Class A Partners hereby restates, certifies, represents and warrants to the
UPREIT all of the Basic Warranties, which shall survive any Closing hereunder.

         (b) UPREIT. The UPREIT hereby restates, certifies, represents and
warrants to the Class A Partners the matters set forth in Section 5 of the
Contribution Agreement as to its business affairs and status, which shall
survive any Closing hereunder.

                                       10


7. Indemnification.

         (a) Class A Partners. Without limiting any indemnity or other
obligation under the Contribution Agreement, each Class A Partner shall
indemnify, defend and hold harmless the UPREIT and the Trust (collectively,
"Preit Indemnitees") against and in respect of any and all losses, costs,
expenses (including, without limitation, reasonable defense and attorneys'
fees), claims, actions, damages, obligations, liabilities or diminutions in
value (collectively, "Damages," and including any loss, liability or damages
attributable to any Warranty Exceptions as defined in Section 3(a)(vi) above),
arising out of, based upon or otherwise in respect of: (a) any inaccuracy in or
breach of any representation or warranty of such Class A Partner made in or
pursuant to this Agreement and/or to be made pursuant to the Put or the Call
(including without limitation the Updated Warranties) and (b) any failure of
such Class A Partner to perform any obligation relating to the Put or the Call.

         (b) UPREIT. Without limiting any indemnity or other obligation under
the Contribution Agreement, the UPREIT shall indemnify, defend and hold harmless
each Class A Partner against and in respect of any and all Damages arising out
of, based upon or otherwise in respect of: (a) any inaccuracy in or breach of
any representation or warranty of the UPREIT made in or pursuant to this
Agreement and/or to be made pursuant to the Put or the Call; and (b) any failure
of the UPREIT to perform any obligation relating to the Put or the Call.

         (c) Procedure For Indemnification - Third Party Claims.

         (i) Within thirty days after receipt by an indemnified party of notice
         of the commencement of any proceeding against it to which the
         indemnification in this Section 7 relates, such indemnified party
         shall, if a claim is to be made against an indemnifying party under
         Section 7, give notice to the indemnifying party of the commencement of
         such proceeding, but the failure to so notify the indemnifying party
         will not relieve the indemnifying party of any liability that it may
         have to any indemnified party, except to the extent that the
         indemnifying party, demonstrates that the defense of such proceeding is
         materially prejudiced by the indemnified party's failure to give such
         notice.

                                       11


         (ii) If any proceeding referred to in paragraph (i) above is brought
         against an indemnified party and it gives notice to the indemnifying
         party of the commencement of such proceeding, the indemnifying party
         will be entitled to participate in such proceeding and, to the extent
         that it wishes (unless (i) the indemnifying party is also a party to
         such proceeding and the indemnified party determines in good faith that
         joint representation would be inappropriate, or (ii) the indemnifying
         party fails to provide reasonable assurance to the indemnified party of
         its financial capacity to defend such proceeding and provide
         indemnification with respect to such proceeding), to assume the defense
         of such proceeding with counsel reasonably satisfactory to the
         indemnified party and, after notice from the indemnifying party to the
         indemnified party of its election to assume the defense of such
         proceeding, the indemnifying party will not, as long as it diligently
         conducts such defense, be liable to the indemnified party under Section
         7 for any fees of other counsel or any other expenses with respect to
         the defense of such proceeding, in each case subsequently incurred by
         the indemnified party in connection with the defense of such
         proceeding, other than reasonable costs of investigation. If the
         indemnifying party assumes the defense of a proceeding, (A) it will be
         conclusively established for purposes of this Agreement that the claims
         made in that proceeding are within the scope of and subject to
         indemnification; (B) no compromise or settlement of such claims may be
         effected by the indemnifying party without the indemnified party's
         consent unless (l) there is no finding or admission of any violation of
         applicable law by the indemnified party (or any affiliate thereof) or
         any violation of the rights of any Person and no effect on any other
         claims that may be made against the indemnified party, and (2) the sole
         relief provided is monetary damages that are paid in full by the
         indemnifying party. The indemnified party will have no liability with
         respect to any compromise or settlement of the claims underlying such
         proceeding effected without its consent. If notice is given to an
         indemnifying party of the commencement of any proceeding and the
         indemnifying party does not, within ten days after the indemnified
         party's notice is given, give notice to the indemnified party of its
         election to assume the defense of such proceeding, the indemnifying
         party will be bound by any determination made in such proceeding or any
         compromise or settlement effected by the indemnified party.



                                       12


         (iii) Notwithstanding the foregoing, if an indemnified party determines
         in good faith that there is a reasonable probability that a proceeding
         may adversely affect it or its affiliates other than as a result of
         monetary damages for which it would be entitled to indemnification
         under this Agreement, the indemnified party may, with respect to those
         issues, by notice to the indemnifying party, assume the exclusive right
         to defend, compromise, or settle such proceeding, but the indemnifying
         party will not be bound by any determination of a proceeding so
         defended or any compromise or settlement effected without its consent.

         (d) Procedure for Indemnification - Other Claims. A claim for any
matter not involving a third party claim may be asserted by notice to the party
from whom indemnification is sought.

         (e) Transfers by Class A Partners. Without limiting any other
applicable restrictions or limitations on the transfer of Units, no Class A
Partner shall distribute or otherwise transfer to any other person or entity any
Units issued pursuant to this Agreement unless such person or entity first
executes and delivers to the Trust and the UPREIT an agreement, in form and
substance reasonably satisfactory to the Trust and the UPREIT, by which such
person or entity would agree to be bound by the indemnification provisions
hereof.



                                       13


         (f) Right of Set-Off. The Trust and the UPREIT shall have the right to
set-off, against any Consideration or Units which may be owed by the Trust or
the UPREIT to any Class A Partner or any distributions with respect thereto
(including without limitation any Consideration payable on account of the
exercise of the Put or the Call), any amount owed by any Class A Partner to any
Preit Indemnitee pursuant to this Agreement, the Contribution Agreement or any
of the other agreements, documents or transactions contemplated hereby or
thereunder, including without limitation the indemnification provisions of
Section 9 of the Contribution Agreement. To the extent that a Class A Partner
contests an indemnification claim of the Trust or the UPREIT that would be the
basis for the exercise of a right to set off, the UPREIT shall issue such Units
or other Consideration and deposit them with an escrow agent reasonably
satisfactory to the UPREIT and such Class A Partner until the earlier to occur
of (i) resolution of such dispute by a final nonappealable order of a court of
competent jurisdiction or (ii) the mutual agreement of such Class A Partner and
the UPREIT that such Units or other Consideration should be released from
escrow.

         (g) Indemnification Payments. The Class A Partners shall be entitled to
use cash or Units to make indemnification payments hereunder. In the event Units
are used, each such unit shall be valued based on the per share Value (as
defined in the amended UPREIT Partnership Agreement) of a Trust Share as of the
date such Unit is tendered to the Trust or the UPREIT as an indemnification
payment hereunder.

         (h) Survival. The obligations of the parties set forth in this Section
7 shall survive any Closing for the Put or the Call.

8. Security.

         (a) Security for Call. As security for the obligations of all of the
Class A Partners to honor their respective obligations under the Call, should
the Call be exercised, the Class A Partners shall, contemporaneously herewith,
execute and deliver to the UPREIT a Security Agreement in the form set forth on
Schedule G hereto, pursuant to which they shall, until the expiration of the
Call Period, pledge and grant liens on and security interests in their Retained
Interests in the Partnership. The Class A Partners shall further authorize the
filing of financing statements evidencing the security interests created under
said Security Agreement.

                                       14


         (b) Retained Rights. As more fully set forth in the aforesaid Security
Agreement, so long as the Class A Partners are not in material default of their
obligations under this Agreement, the pledge and security interests granted to
the UPREIT by such document shall not impair the right of the Class A Partners
to receive distributions with respect to, and/or to exercise other rights
attributable to, the Retained Interests.

9. Binding Effect. The covenants, terms, and provisions of this Agreement shall
be binding upon and inure to benefit of the parties hereto and their respective
heirs, legal representatives, successors, transferees, and assigns, and as
contemplated by Section 7 hereof, the Trust, subject to the applicable
restrictions on transfer as set forth in this Agreement.

10. Capacity of UPREIT. Notwithstanding that the UPREIT is a Class B Limited
Partner of the Partnership, the UPREIT has entered into this Agreement not in
its capacity as such limited partner but solely in its separate and independent
capacity as a Delaware limited partnership existing pursuant to the UPREIT
Partnership Agreement referred to herein. In no event will any of the rights,
privileges or options of the UPREIT under this Agreement be limited, impaired or
restricted by any provision of the Partnership Agreement (i.e., the partnership
agreement of New Castle Associates) or by any past, present or future matter or
thing whatsoever related to or arising out of such Partnership Agreement or the
relationships, rights and/or obligations as among the partners thereof.

11. Governing Law. The laws of the Commonwealth of Pennsylvania shall govern the
validity of this Agreement, the construction of its terms, and the
interpretation of the rights and duties of the parties hereto.

12. Counterpart Execution. This Agreement may be executed in any number of
counterparts with the same effect as if all of the parties hereto had signed the
same document and any and all counterparts may be executed by facsimile. All
counterparts shall be construed together and shall constitute one agreement.

                                       15


13. Notices. All notices or other communications permitted or required under
this Agreement shall be in writing and shall be sufficiently given if and when
hand delivered to the persons set forth below or if sent by documented overnight
delivery service or registered or certified mail, postage prepaid, return
receipt requested, or telecopy, receipt acknowledged, addressed as set forth
below or to such other person or persons and/or at such other address or
addresses as shall be furnished in writing by any party hereto to the others.
Any such notice or communication shall be deemed to have been given as of the
date received, in the case of personal delivery, or on the date shown on the
receipt or confirmation therefor in all other cases.

                  To the Trust or the UPREIT:
                  --------------------------

                  c/o PREIT-Rubin, Inc.
                  200 South Broad Street - 3rd Floor
                  Philadelphia, PA  19102
                  Attn:  George F. Rubin

                  With a copy to:

                  Blank Rome LLP
                  One Logan Square, Philadelphia, PA 19103
                  Attn:  G. Craig Lord, Esq.


                  To the Class A Partners:
                  ------------------------

                  At the address specified for such partner on
                  Schedule A attached hereto

                  With a copy to:

                  Klehr, Harrison, Harvey, Branzburg & Ellers LLP
                  260 S. Broad Street
                  Philadelphia, PA 19102
                  Attention:  Lawrence J. Arem, Esquire


                                       16



         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day first written above.

Class A Partners:

IVYRIDGE INVESTMENT CORP.


By:      /s/ Arthur H. Kaplan
         --------------------------------------------
         Name:    Arthur H. Kaplan
         Title:   President

PAN AMERICAN ASSOCIATES

By:      Pan American Office Investments, L.P.

         By:  Pan American Office Investments - G.P., general partner

                  By:      /s/ George F. Rubin
                           --------------------------------------------
                           Name:    George F. Rubin
                           Title:   President

The UPREIT

PREIT ASSOCIATES, L.P.

By:      Pennsylvania Real Estate Investment Trust,
         its general partner

         By:      /s/ Bruce Goldman
                  -------------------------------------------------
                  Name:    Bruce Goldman
                  Title:   Senior Vice President & General Counsel

The General Partner

PR NEW CASTLE LLC, a Pennsylvania limited liability company

By :     PREIT Associates, L.P., its sole member

         By:      Pennsylvania Real Estate Investment Trust,
                  its general partner

                  By:      /s/ Bruce Goldman
                           --------------------------------------------------
                           Name:    Bruce Goldman
                           Title:   Senior Vice President and General Counsel


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