EXHIBIT 10.7


                    FIRST AMENDMENT TO CONTRIBUTION AGREEMENT

         THIS FIRST AMENDMENT TO CONTRIBUTION AGREEMENT dated as of October 6,
1998 by and among BRANDYWINE OPERATING PARTNERSHIP, L.P., a Delaware limited
partnership having an address at Newtown Square Corporate Campus, 16 Campus
Boulevard, Suite 150, Newtown Square, PA 19073 (the "Partnership"), BRANDYWINE
REALTY TRUST, a Maryland real estate investment trust having an address at
Newtown Square Corporate Campus, 16 Campus Boulevard, Suite 150, Newtown Square,
PA 19073 (the "Trust"), DONALD E. AXINN, having an address c/o Donald E. Axinn
Companies, 131 Jericho Turnpike, Jericho, New York 11743 ("Axinn") and the other
contributors (the "Other Contributors", and, together with Axinn, the
"Contributors").

                              W I T N E S S E T H:

         WHEREAS, the Partnership, the Trust and the Contributors entered into a
certain contribution agreement made as of the 10th day of July, 1998 (the
"Original Agreement") pursuant to which each of the Contributors agreed to sell
or contribute and the Partnership agreed to acquire or accept all of such
Contributors' right, title and interest in and to certain Property and Entity
Interests (as such terms are defined in the Original Agreement);

         WHEREAS, in order to delete the Property at 125 Jericho Turnpike as a
Critical Property, the Original Agreement was modified pursuant to the terms of
a certain letter agreement between the Partnership, the Trust and Axinn dated
August 28, 1998 (the "Letter Agreement" and, together with the Original
Agreement, the "Contribution Agreement");

         WHEREAS, the parties hereto desire to further amend and modify the
Contribution Agreement, subject to the terms and conditions hereinafter set
forth.

         NOW, THEREFORE, for ten ($10.00) dollars and other good and valuable
consideration, the receipt and sufficiency which are hereby acknowledged, the
parties, intending to be legally bound, agree as follows:

     1. ASSUMED MORTGAGE LOANS. Notwithstanding anything contained in the
Contribution Agreement to the contrary, the parties hereto agree that all of the
Mortgage Loans shall be treated as Subject-to Mortgage Loans (and not as Assumed
Mortgage Loans). All references in the Contribution Agreement to Assumed
Mortgage Loans and the requirement that the Partnership assume the Assumed
Mortgage Loans at the Closing are hereby deleted in their entirety.


     2. 125-131 JERICHO TURNPIKE. Axinn, the Contributor of the 125-131 Jericho
Turnpike, New York Property (the "Jericho Property"), the Partnership and the
Trust hereby agree that the Closing for the Jericho Property shall occur
simultaneously with the Old Country Road Closing. In addition, it is agreed
between Axinn, the Partnership and the Trust that, from and after the Initial
Closing to and including the Old Country Road Closing (the "Jericho Property
Interim Period"): (a)Axinn shall receive all of the operating income for the
Jericho Property and shall also be responsible for all operating expenses with
respect thereto; and (b) during the Jericho Property Interim Period, Brandywine
Realty Services Corporation ("BRSCO") shall manage the Jericho Property pursuant
to the form of Management Agreement attached hereto as Exhibit A, subject to the
right of BRSCO to terminate its obligations under such Management Agreement in
accordance with its terms. The obligations of the Partnership and the Trust to
acquire the Jericho Property are subject to compliance with the obligations of
the applicable Contributors, and satisfaction of the closing conditions
contained in the Contribution Agreement for the benefit of the Trust and
Partnership, including without limitation, updated tenant estoppel certificates.
In addition to the foregoing, leasing commissions, tenant improvements
allowances, capital expenditures and lease proposals, amendments and
modifications shall continue to be treated and subject to the Partnership's
approval in accordance with Paragraphs 7(e) and 18 (e) of the Contribution
Agreement.

     3. 245 OLD COUNTRY ROAD. Axinn Ellipse Associates ("AEA"), the Contributor
of the 245 Old Country Road, Melville, New York Property (the "245 OCR
Property"), the Partnership and the Trust each hereby acknowledge that Citicorp,
the tenant at the 245 OCR Property ("Citicorp"), has an option to purchase the
245 OCR Property at certain times during the term of its lease with AEA (the
"Citicorp Purchase Option"). Axinn, on behalf of himself, AEA and the partners
of AEA, hereby agrees that the restrictions on the sale or transfer of property
in Paragraph 41(c) of the Contribution Agreement shall not apply in the event
Citicorp exercises the Citicorp Purchase Option. The Partnership and the Trust
hereby agree that, in the event Citicorp exercises the Citicorp Purchase Option,
the Partnership and the Trust shall take commercially reasonable action (such as
allowing AEA to guarantee additional debt of the Partnership and the Trust to

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the extent the Trust and Partnership maintain such debt) in order to allow AEA
to seek to continue to defer recognition of gain for federal and state income
tax purposes in connection with the 245 OCR Property.

     4. CONSIDERATION. The parties hereto agree that the last sentence of
Paragraph 3(c) of the Contribution Agreement is deleted in its entirety and the
following is inserted in lieu thereof:

     "The parties agree that in all cases in which Participants of
     the same Contributor have elected to receive different forms
     of Consideration (ie. cash v. Units), such Contributor and
     Participants shall contribute, assign, transfer and convey to
     the Partnership (or its designee) and the Partnership shall
     accept from each Participant partner or member of the
     Contributor which owns such New York Property, all of such
     Participant's Entity Interest in and to such Contributor."


     5. REMOVAL OF CERTAIN PROPERTIES. The parties acknowledge and agree that
the properties located at 163-167 South Service Road, Plainview, New York, and
885 Waverly Avenue, Holtsville, New York, have been removed from the
transactions provided for in the Contribution Agreement, and the references in
the Contribution Agreement to such Properties, including the purchase price
payable for them, are hereby deleted.


     6. CONFIRMATION OF CERTAIN MATTERS.

         (a) Axinn hereby represents and warrants that all documents executed
and delivered by him at the Initial Closing being held on the date hereof under
the Contribution Agreement in his capacity as attorney-in-fact have been
executed and delivered by him pursuant to a valid and binding delegation of
authority which remains in full force and effect.

         (b) Axinn hereby represents and warrants that the following corrections
are made to Schedule 1 to the Contribution Agreement: (i) the contents of the
box at the fourth row and second column of page 6 shall be restated in its

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entirety to read "Axinn-New Durham Associates, a New Jersey general
partnership", and (ii) the contents of the box at the fourth row and fifth
column of page 6 shall be restated in its entirety to read "78.02".

         (c) Axinn hereby represents and warrants that the partnership that owns
the Property known as 44 National Road, Edison, New Jersey is a general
partnership notwithstanding the reference to such entity as a limited
partnership in the agreement setting forth the partnership relationship among
the partners. Axinn agrees to hold the Trust and Partnership harmless against
any loss attributable to an entity being other than in the form set forth in the
Schedules to the Contribution Agreement or being governed by any law other than
the law set forth in the Schedules to the Contribution Agreement.

     7. MAINTENANCE OF INSURANCE. The Contributors covenant and agree to
maintain, and timely pay all premiums due in connection with, replacement-cost,
all-risk casualty and comprehensive general liability insurance with respect to
the 31 Commercial, 263 Old Country Road, 131 Jericho Turnpike, 125 Jericho
Turnpike, 101 Paragon and 3 Paragon properties. All such insurance shall name
Brandywine Operating Partnership, L.P. as an additional insured, as its
interests may appear, with such coverage to be confirmed in a certificate of
insurance to be issued to Buyer within 15 days of the Initial Closing. The
aforesaid insurance may be canceled upon the transfer or contribution, as the
case may be, of such property to Buyer.

         8. CHANGE TO CERTAIN DATES. The dates November 1, 1998, February 1,
1999, May 1, 1999 and August 1, 1999 referenced in Paragraph 14(a)(v) of the
Contribution Agreement are hereby changed to January 1, 1999, April 1, 1999,
July 1, 1999 and October 1, 1999.

         9. INDUSTRIAL SITE RECOVERY ACT UNDERTAKING. Notwithstanding anything
to the contrary in the Contribution Agreement, with respect to the Property
located at 44 National Road, Edison, New Jersey, Axinn covenants to use
reasonable best efforts to obtain the appropriate approvals from the New Jersey
Department of Environmental Protection ("NJDEP") under ISRA, which may take the
form of one or more of the following: (i) NJDEP's approval of a Negative
Declaration Affidavit; (ii) a so called "No Further Action" letter; (iii)
NJDEP's approval of a De Minimis Quantity Exemption; (iv) NJDEP's approval of an

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Expedited Review Application; (v) NJDEP's approval of a Remedial Action Workplan
or Remediation Agreement; or (vi) such other approvals or determinations which
may be available from NJDEP with respect to the applicable transaction. In
addition to the foregoing, Section 11(b)(10) shall be amended to include the
phrase "and all costs incurred and all liabilities arising in connection with
the non-compliance by Seller with ISRA in connection with the transfer of 44
National Road" between the words "thereof" and "regardless" in the 26th line of
Section 11(b).

         10. MISCELLANEOUS. All capitalized terms not defined herein shall have
the same meaning ascribed to them in the Contribution Agreement. Except as
modified herein, all of the terms and conditions of the Contribution Agreement
shall remain unchanged and in full force and effect.


         11. BINDING EFFECT. The terms and conditions of this First Amendment
shall be binding upon and shall inure to the benefit of the parties hereto and
their respective successors and assigns.

         IN WITNESS WHEREOF, the parties have executed this First Amendment to
Contribution Agreement as of the day and year first above written.

                                        BRANDYWINE OPERATING PARTNERSHIP, L.P.
                                        BY: BRANDYWINE REALTY TRUST,
                                            Its General Partner


                                        BY: /s/ Gerard H. Sweeney
                                            -----------------------------------
                                            Title: President and
                                            Chief Executive Officer


                                        BRANDYWINE REALTY TRUST


                                        BY: /s/ Gerard H. Sweeney
                                            -----------------------------------
                                            Title: President and
                                            Chief Executive Officer

                             (Signatures Continued)

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                                            /s/ Donald E. Axinn
                                            -----------------------------------
                                            DONALD E. AXINN


                                           /s/ Donald E. Axinn
                                           ------------------------------------
                                           MORRIS L. GREEN
                                      By:  Donald E. Axinn, his
                                           Attorney-in-Fact


                                      AXINN AVENUE ASSOCIATES
                                      AXINN ELLIPSE ASSOCIATES
                                      AXINN-MELVILLE, LLP
                                      AXINN EDISON ASSOCIATES
                                      AXINN-NEW DURHAM ASSOCIATES
                                      DONALD E. AXINN, L.L.C.
                                      AXINN-BERNHARD ASSOCIATES


                                      BY: /s/ Donald E. Axinn
                                          -------------------------------------
                                          Donald E. Axinn



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