ACADIA REALTY TRUST
SC 13D/A, 2000-05-23
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13D/A

                    Under the Securities Exchange Act of 1934
                                (Amendment No.3)
                Acadia Realty Trust (formerly Mark Centers Trust)
- -------------------------------------------------------------------------------
                                (Name of Issuer)

         Common Shares of Beneficial Interest, Par Value $.001 Per Share
                         (Title of Class of Securities)

                                   004239 10 9
    ---------------------------------------------------------------------------
                                 (CUSIP Number)

                             Mark Schonberger, Esq.
                                Battle Fowler LLP
                                Park Avenue Tower
                               75 East 55th Street
                                 (212) 856-7000
 (Name, Address and Telephone Number of Person Authorized to Receive Notices
                              and Communications)

                                  April 7, 2000
   ----------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box .  /  /

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act.


913320.2

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<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                 Page  1  of  27  Pages
           -----------                                                                   ---    ----
- --------------------------------------------                                        --------------------------------------------



<S>                                                                                                          <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          RD Properties L.P. VI
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                  (a)  /X/
                                                                                                             (b)  / /
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                              /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
                             7        SOLE VOTING POWER
                                      None.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      None.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   None.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                               /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   0.0%
14        TYPE OF REPORTING PERSON*
          PN

</TABLE>


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  2  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                       <C>
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           RD Properties L.P. VIA
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  /X/
                                                                                                          (b)  / /
3          SEC USE ONLY

4          SOURCE OF FUNDS*

           WC
5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                            /  /

6          CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                          7         SOLE VOTING POWER
                                    None.  See Item 5.
NUMBER OF
SHARES                    8         SHARED VOTING POWER
BENEFICIALLY                        None.  See Item 5.
OWNED BY
EACH                      9         SOLE DISPOSITIVE POWER
REPORTING                           None.  See Item 5.
PERSON WITH
                         10         SHARED DISPOSITIVE POWER
                                    None.  See Item 5.

11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    None.  See Item 5.
12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           /  /

13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    0.0%
14         TYPE OF REPORTING PERSON*
           PN

</TABLE>


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                   Page  3  of  27  Pages
           -----------                                                                     ---    ----
- --------------------------------------------                                          --------------------------------------------



<S>                                                                                                       <C>
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           RD Properties L.P. VIB
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  /X/
                                                                                                          (b)  / /
3          SEC USE ONLY

4          SOURCE OF FUNDS*

           WC
5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                           /  /

6          CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                          7         SOLE VOTING POWER
                                    None.  See Item 5.
NUMBER OF
SHARES                    8         SHARED VOTING POWER
BENEFICIALLY                        None.  See Item 5.
OWNED BY
EACH                      9         SOLE DISPOSITIVE POWER
REPORTING                           None.  See Item 5.
PERSON WITH
                         10         SHARED DISPOSITIVE POWER
                                    None.  See Item 5.

11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    None.  See Item 5.
12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                         /  /

13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    0.0%
14         TYPE OF REPORTING PERSON*
                       PN

</TABLE>


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  4  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          RD New York VI, LLC
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
                             7        SOLE VOTING POWER
                                      134,661.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.   See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      134,661.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   134,661.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   0.5%
14        TYPE OF REPORTING PERSON*
                      OO

</TABLE>

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  5  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------


<S>                                                                                                      <C>

1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Yale University, a Connecticut Corporation
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Connecticut
                             7        SOLE VOTING POWER
                                      See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   6,138,492.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   21.9%
14        TYPE OF REPORTING PERSON*
                      CO

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  6  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------


<S>                                                                                                      <C>

1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Yale University Retirement Plan for Staff Employees
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

           Connecticut
                             7        SOLE VOTING POWER
                                      403,994.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      403,994.  See Item 5.

 11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   403,994.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                        /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   1.6%
14        TYPE OF REPORTING PERSON*
                      EP

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  7  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Carnegie Corporation of New York
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

           New York
                             7        SOLE VOTING POWER
                                      942,653.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      942,653.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   942,653.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   3.7%
14        TYPE OF REPORTING PERSON*
                      CO and EP

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  8  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          The Vanderbilt University
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Tennessee
                             7        SOLE VOTING POWER
                                      1,346,647.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      1,346,647.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   1, 346,647.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                         /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   5.3%
14        TYPE OF REPORTING PERSON*
                      EP

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  9  of  27  Pages
           -----------                                                                      ---    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          TRW Master Trust
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Ohio
                             7        SOLE VOTING POWER
                                      1,200,000.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      1,200,000.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   1,200,000.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.7%.
14        TYPE OF REPORTING PERSON*
                     EP

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  10  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Harvard Private Capital Realty, Inc.
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

           Massachusetts
                             7        SOLE VOTING POWER
                                      None.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      2,000,000.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   2,000,000.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   7.9%
14        TYPE OF REPORTING PERSON*
                      CO

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  11  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Charlesbank Capital Partners, LLC
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          OO
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

           Massachusetts
                             7        SOLE VOTING POWER
                                      2,000,000.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      2,000,000.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   2,000,000.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   7.9%
14        TYPE OF REPORTING PERSON*
                      OO

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  12  of  27  Pages
           -----------                                                                      ----    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          The Board of Trustees of the Leland Stanford Junior University
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          California
                             7        SOLE VOTING POWER
                                      2,133,333.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      2,133,333.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   2,133,333.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   8.4%
14        TYPE OF REPORTING PERSON*
                      EP

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  13  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Howard Hughes Medical Institute
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
                             7        SOLE VOTING POWER
                                      2,266,667.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          None.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      2,266,667.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   2,266,667.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                            /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   9.0%
14        TYPE OF REPORTING PERSON*
                   CO (Non-profit)

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  14  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            -------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Five Arrows Realty Securities L.L.C.
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  / /
                                                                                                         (b)  /X/  See Item 6.
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
                             7        SOLE VOTING POWER
                                      None.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          3,266,667.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      3,266,667.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   3,266,667.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   12.9%
14        TYPE OF REPORTING PERSON*
                      OO

</TABLE>


913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  15  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                           --------------------------------------------



<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Rothschild Realty Investors II L.L.C.
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  /X/  See Item 6.
                                                                                                         (b)  / /
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                         /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
                             7        SOLE VOTING POWER
                                      None.  See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          3,266,667.  See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           None.  See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      3,266,667.  See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   3,266,667.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                         /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   12.9%
14        TYPE OF REPORTING PERSON*
                      OO

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  16  of  27  Pages
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<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Ross Dworman
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  /X/
                                                                                                         (b)  / /
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                         /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          United States
                             7        SOLE VOTING POWER
                                      See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                             See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   1,817,320.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                          /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   6.9%
14        TYPE OF REPORTING PERSON*
                      IN

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  17  of  27  Pages
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<S>                                                                                                      <C>
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Kenneth F. Bernstein
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a)  /X/
                                                                                                         (b)  / /
3         SEC USE ONLY

4         SOURCE OF FUNDS*

          WC
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                                                          /  /

6         CITIZENSHIP OR PLACE OF ORGANIZATION

          United States
                             7        SOLE VOTING POWER
                                      See Item 5.
NUMBER OF
SHARES                       8        SHARED VOTING POWER
BENEFICIALLY                          See Item 5.
OWNED BY EACH
REPORTING                    9        SOLE DISPOSITIVE POWER
PERSON WITH                           See Item 5.

                            10        SHARED DISPOSITIVE POWER
                                      See Item 5.

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   759,201.  See Item 5.
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                            /  /

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   2.9%
14        TYPE OF REPORTING PERSON*
                      IN

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  18  of  27  Pages
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<S>                                                                                            <C>

Item 1.  Security and Issuer.

          This third  amendment  (this  "Amendment  No. 3") to the  statement on
Schedule 13D filed by the  Reporting  Persons (as defined in Item 2 hereof) with
the  Securities  and Exchange  Commission of September  16, 1998 (the  "Original
13D"),  as amended by the  statements on Schedule 13D/A filed by Five Arrows and
Rothschild  (each, as defined in Item 2 hereof) with the Securities and Exchange
Commission on May 21, 1999 and May 24, 1999 (together, the "Five Arrows 13D/A"),
is being filed with respect to the common  shares of  beneficial  interest,  par
value $.001 per share (the "Common  Shares") of Acadia  Realty  Trust  (formerly
known as Mark  Centers  Trust),  a Maryland  real estate  investment  trust (the
"Trust"), whose principal executive offices are located at 805 Third Avenue, 9th
Floor, New York, NY 10022.

Item 2.  Identity and Background.

          (a) This  Amendment  No. 3 is being  filed on behalf of the  following
entities: (i) RD Properties,  L.P. VI, a limited partnership organized under the
laws of the State of Delaware ("RDVI"); (ii) RD Properties,  L.P. VIA, a limited
partnership  organized under the laws of the State of Delaware ("RDVIA");  (iii)
RD Properties  L.P. VIB, a limited  partnership  organized under the laws of the
State of Delaware  ("RDVIB" and together with RDVI and RDVIA,  the "RDC Funds");
(iv) RD New York VI, LLC, a limited  liability  company organized under the laws
of the State of Delaware and the sole  general  partner of each of the RDC Funds
(the  "General  Partner");   (v)  Yale  University,  a  Connecticut  Corporation
("Yale");  (vi) Yale University  Retirement Plan for Staff Employees ("YURPSE");
(vii)  Carnegie  Corporation   ("Carnegie");   (ix)  the  Vanderbilt  University
("Vanderbilt");  (x) TRW Master  Trust  ("TRW");  (xi) Harvard  Private  Capital
Realty,   Inc.   ("Harvard");    (xii)   Charlesbank   Capital   Partners,   LLC
("Charlesbank");  (xiii) the Board of  Trustees  of the Leland  Stanford  Junior
University  ("Stanford");  (xiv) Howard Hughes Medical Institute ("HHMI");  (xv)
Five Arrows Realty  Securities  L.L.C.,  a Delaware  limited  liability  company
("Five Arrows"); (xvi) Rothschild Realty Investors II L.L.C., a Delaware limited
liability  company and sole managing  member of Five Arrows  ("Rothschild",  and
together with Yale, YURPSE, Carnegie,  Vanderbilt,  TRW, Harvard, Stanford, HHMI
and Five Arrows, the "LP Reporting Persons");  (xvii) Ross Dworman, a citizen of
the United  States and a managing  member of the  General  Partner  ("Dworman");
(xviii)  Kenneth F.  Bernstein,  a citizen  of the United  States and a managing
member of the General Partner ("Bernstein", and together with (i) through (xvii)
above, the "Reporting Persons").

          (b)  The  business  address  of each of the  RDC  Funds,  the  General
Partner, Dworman and Bernstein is c/o Acadia Realty Trust, 805 Third Avenue, 9th
Floor,  New York, NY 10022.  The business address of Yale and YURPSE is c/o Yale
University  Investments  Office, Real Estate, 230 Prospect Street, New Haven, CT
06511-2107.  The business address of Carnegie is c/o Carnegie Corporation of New
York, 437 Madison Avenue, New York, NY 10022. The business address of Vanderbilt
is c/o Vanderbilt  University,  Treasurer's Office, Alumni Hall, Nashville,  TN,
37240.  The  business  address  of TRW is c/o  TRW  Investment  Management  Co.,
Executive Offices, 1900 Richmond Road, Cleveland, OH 44124. The business address
of Harvard and Charlesbank is 600 Atlantic Avenue,  Boston,  MA 02210-2203.  The
business  address of HHMI is c/o Howard  Hughes  Medical  Institute,  4000 Jones
Bridge Road, Chevy Chase, MD 20815-6789. The business address of Stanford is c/o
Stanford  Management  Company,  2770 Sand Hill Road,  Menlo Park, CA 94025.  The
business address of each of Five Arrows and Rothschild is c/o Rothschild Realty,
Inc., 1251 Avenue of the Americas, 51st Floor, New York, NY 10020.

     (c) The business of each of the RDC Funds is the ownership and  development
of real estate  projects.  The principal  occupation  of the General  Partner is
acting as general partner of each of the RDC Funds. The current managing members
of the General  Partner are Dworman and  Bernstein who are also the Chairman and
Chief Executive Officer and President,  respectively, of the Trust. Harvard is a
charitable   company  holding  a  portion  of  the  endowment  fund  of  Harvard
University. Harvard is controlled by President and Fellows of Harvard College, a
Massachusetts   educational   corporation  and  title-holding  company  for  the
endowment fund of Harvard University.  The directors of Harvard, all of whom are
citizens of the United States of America,  and whose principal  business address
is located at 600 Atlantic  Avenue,  Boston MA 02210,  are Michael R.  Eisenson,
Jack R. Meyer and Charles F. Wu. The executive officers of Harvard,  all of whom
are  citizens of the United  States of  America,  and whose  principal  business
address is located at 600  Atlantic  Avenue,  Boston,  MA 02210,  are Michael R.
Eisenson (President),  William P. Douglas (Vice President),  Charles F. Wu (Vice
President),  Stephen  McSweeney  (Treasurer),  Tami E. Nason (Clerk) and Michael
Thonis  (Assistant  Clerk).  Charlesbank is a  Massachusetts  limited  liability
company organized  primarily for the purpose of acting as an investment  manager
to the  President  and Fellows of Harvard  College and certain  other  entities.
Charlesbank,  pursuant to an agreement  among  Charlesbank,  the  President  and
Fellows of Harvard College and certain individuals, has sole power to direct the
vote on the Common Shares of which Harvard is the beneficial owner. The Managing
Members  of  Charlesbank,  all of whom are  citizens  of the  United  States  of
America, and whose principal business address is located at 600 Atlantic Avenue,
Boston,  MA 02210,  are Mary Lou Boutuel,  Michael R.  Eisenson,  Kim  G. Davis,
William P. Douglas,

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  19  of  27  Pages
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<S>                                                                                            <C>

Tim  R.   Palmer,   Mark  A.  Rosen,   Michael  Thonis  and  Charles F. Wu. Five
Arrows  is  a  private  investment  limited  liability  company.  The  principal
occupation  of  Rothschild  is acting as  managing  member of Five  Arrows.  The
current managers of Rothschild are John D. McGurk,  Matthew W. Kaplan,  James E.
Quigley,  3rd,  and D.  Pike  Aloian.  The  business  of each of  Yale,  YURPSE,
Carnegie,  Vanderbilt,  TRW,  Harvard and  Stanford is to invest money for their
respective affiliate institutions. HHMI is engaged in philanthropic activities.

          (d) None of the  Reporting  Persons  has,  during the last five years,
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors).

          (e) None of the  Reporting  Persons  has,  during the last five years,
been a party to a civil  proceeding  of a  judicial  or  administrative  body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment decree or final order enjoining future violations of, or prohibiting or
mandating  activities  subject to, federal or state securities laws or a finding
of any violation with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration.

          The  source  of  funds  for  the  purchases  reported  by  each of the
Reporting  Persons  herein was working  capital of each such  Reporting  Person.
Reference  is  made  to the  Original  13D  and  the  Five  Arrows  13D/A  for a
description  of the total  amount of funds used by such  parties to purchase the
Common Shares reported therein. The Units deemed to be beneficially held by Yale
and the Units and Common  Shares deemed to be  beneficially  held by Dworman and
Bernstein  (see  Item 5 below)  were  received  for  certain  interests  in real
properties  contributed to the Trust pursuant to the Transactions (as defined in
Item 4 below).  See the Original  13D. The Options  directly held by Dworman and
Bernstein  (see Item 5 below)  were  granted to such  persons  pursuant to their
employment agreements with the Trust.

Item 4.  Purpose of Transaction.

          As described in the Original  13D, the purpose of the  acquisition  of
the Common  Shares  reported  therein by the  Reporting  Persons  was to acquire
control of the Trust and for  investment.  The Reporting  Persons  purchased the
16,061,238  Common  Shares  in  connection  with  the  consummation  of  certain
transactions contemplated by a Contribution and Share Purchase Agreement,  dated
as of April 15, 1998,  among the Trust,  Mark Centers  Limited  Partnership  and
certain  entities  affiliated with RD Capital,  Inc. (the  "Transactions").  The
Transactions  were formally  approved by the shareholders of the Trust on August
12,  1998,  which is the  same  date as the  closing  of the  Transactions  (the
"Closing").

          The purpose of the acquisition of the Common Shares  reported  therein
by Five Arrows was for investment purposes.

          The  Reporting  Persons  continue  to own the Common  Shares  reported
herein for investment purposes.

          Each of the  Reporting  Persons  intends to review its  holdings  with
respect to the Trust on a continuing  basis.  Depending on each of the Reporting
Persons'  evaluation  of the Trust's  business  and  prospects,  and upon future
developments (including,  but not limited to, market prices of the Common Shares
and  availability  and  alternative  uses of funds, as well as conditions in the
securities  markets and general economic and industry  conditions),  each of the
Reporting  Persons  may acquire  other  securities  of the Trust,  sell all or a
portion  of its Common  Shares or other  securities  of the Trust,  now owned or
hereafter  acquired,  provided,  however,  that each of  Carnegie,  Five Arrows,
Harvard, HHMI, Stanford,  Vanderbilt,  TRW, Yale, YURPSE and the General Partner
has agreed, pursuant to the agreement described in Exhibit 99.6 in Item 7 below,
that prior to December 28, 2000, they shall not sell, transfer,  convey, assign,
pledge or hypothecate 17,061,238 of the Common Shares beneficially owned by such
Reporting Persons. See Item 6.

          Other than as described  above,  each of the Reporting  Persons has no
present  plans or  proposals  which  relate  to, or would  result in, any of the
matters  enumerated  in  paragraphs  (b) through  (j),  inclusive,  of Item 4 of
Schedule 13D.  Each of the  Reporting  Persons may, at any time and from time to
time, review or reconsider its position with respect to the Trust, and formulate
plans or proposals with respect to any such matters.

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  20  of  27  Pages
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<S>                                                                                            <C>

Item 5.  Interest in Securities of the Issuer.

          (a) As of the close of  business  on April  24,  2000,  the  Reporting
Persons  owned,  within the meaning of Rule 13d-3 under the Exchange Act, in the
aggregate,  22,274,974  Common Shares (includes and assumes the exercise in full
by certain  Reporting  Persons  of  1,000,001  vested  options  to  purchase  an
equivalent  number of Common  Shares  ("Options")  and  includes and assumes the
exchange  in full by certain  Reporting  Persons of  4,171,203  units of limited
partnership  interests in the Trust's majority owned  subsidiary,  Acadia Realty
Limited Partnership,  a Delaware limited partnership of which the Company serves
as general partner, which units are immediately  exchangeable into an equivalent
number of Common Shares ("Units")).  The Reporting Persons  beneficially own, in
the aggregate,  approximately  73.2% of the Common Shares issued and outstanding
as of April 24, 2000. As of the close of business on April 24, 2000,  (i) the RD
Funds owned,  within the meaning of Rule 13d-3 under the Exchange  Act, 0 Common
Shares or 0.0% of the issued and  outstanding  Common  Shares;  (ii) the General
Partner owned,  within the meaning of Rule 13d-3 under the Exchange Act, 134,661
Common Shares (all of which are subject to the terms of the Lock-Up described in
Item 7 below) or 0.5% of the issued and  outstanding  Common Shares;  (iii) Yale
owned, within the meaning of Rule 13d-3 under the Exchange Act, 6,138,492 Common
Shares  (3,366,617 of which are subject to the terms of the Lock-Up described in
Item 7 below) or 21.9% of the issued and  outstanding  Common  Shares  (includes
2,771,876  Units  beneficially  held by Yale through its limited  partnership RD
Properties L.P. V ("RDC"),  the record holder of such Units, which Units must be
distributed  to Yale upon its  instruction  to RDC to do so); (iv) YURPSE owned,
within the meaning of Rule 13d-3 under the Exchange Act,  403,994  Common Shares
(all of which are subject to the terms of the Lock-Up described in Item 7 below)
or 1.6% of the issued and outstanding Common Shares; (v) Carnegie owned,  within
the meaning of Rule 13d-3 under the Exchange Act,  942,653 Common Shares (all of
which are subject to the terms of the Lock-Up described in Item 7 below) or 3.7%
of the issued and outstanding Common Shares;  (vi) Vanderbilt owned,  within the
meaning of Rule 13d-3 under the Exchange  Act,  1,346,647  Common Shares (all of
which are subject to the terms of the Lock-Up described in Item 7 below) or 5.3%
of the issued and outstanding Common Shares; (vii) TRW owned, within the meaning
of Rule 13d-3 under the Exchange Act,  1,200,000 Common Shares (all of which are
subject to the terms of the  Lock-Up  described  in Item 7 below) or 4.7% of the
issued and outstanding Common Shares;  (viii) Harvard owned,  within the meaning
of Rule 13d-3 under the Exchange Act,  2,000,000 Common Shares (all of which are
subject to the terms of the  Lock-Up  described  in Item 7 below) or 7.9% of the
issued and outstanding Common Shares; (ix) Stanford owned, within the meaning of
Rule 13d-3 under the Exchange  Act,  2,133,333  Common  Shares (all of which are
subject to the terms of the  Lock-Up  described  in Item 7 below) or 8.4% of the
issued and outstanding Common Shares; (x) HHMI owned, within the meaning of Rule
13d-3 under the Exchange Act,  2,266,667 Common Shares (all of which are subject
to the terms of the Lock-Up described in Item 7 below) or 9.0% of the issued and
outstanding  Common Shares;  (xi) Five Arrows owned,  within the meaning of Rule
13d-3 under the Exchange Act,  3,266,667 Common Shares (all of which are subject
to the terms of the  Lock-Up  described  in Item 7 below) or 12.9% of the issued
and outstanding  Common Shares;  (xii) Dworman owned,  within the meaning of the
Exchange Act, 1,817,320 Common Shares (107,728 of which are subject to the terms
of the Lock-Up  described in Item 7 below) or 6.9% of the issued and outstanding
Common  Shares  (includes  533,399  Units and 666,667  Options  directly held by
Dworman in his individual  capacity,  61,750 Units  beneficially held by Dworman
through  his equity  interests  in various  limited  partnerships  which are the
record holders of such Units,  107,728  Common Shares deemed to be  beneficially
owned by Dworman through his equity interest in the General Partner,  the record
holder of such Common Shares,  and 438,776 Units deemed to be beneficially  held
by  Dworman  through  his equity  interests  in  various  corporations,  limited
liability companies and limited partnerships which are the record holder of such
Units);  and (xiii)  Bernstein  owned,  within the meaning of the Exchange  Act,
759,201  Common Shares  (26,933 of which are subject to the terms of the Lock-Up
described in Item 7 below) or 2.9% of the issued and  outstanding  Common Shares
(includes  261,691 Units and 333,334  Options  directly held by Bernstein in his
individual  capacity,  26,933 Common Shares deemed to be  beneficially  owned by
Bernstein through his equity interest in the General Partner,  the record holder
of such Common  Shares,  and 103,711  Units  deemed to be  beneficially  held by
Bernstein  through  his  equity  interests  in  various  corporations,   limited
liability  companies and limited  partnerships  which are the record  holders of
such Units).  Rothschild,  as sole managing member of Five Arrows, may be deemed
the  beneficial  owner  of the  3,266,667  Common  Shares  held by Five  Arrows.
Charlesbank,  by virtue of its relationship  with Harvard described under Item 2
(c) above,  may be deemed to have beneficial  ownership of the 2,000,000  Common
Shares beneficially owned by Harvard.

          (b) See (a) above.

          (c) On  April  7,  2000,  pursuant  to the  terms  of the  partnership
agreements  of the RDC Funds  described in Exhibits  99.3 through 99.5 in Item 7
below, the RDC Funds distributed the Common Shares of which they were the record
holders to the limited

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  21  of  27  Pages
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<S>                                                                                                <C>

partners  in  the  RDC Funds,  in  accordance   with  such  limited    partners'
limited partnership  interests.  Immediately after such  distributions,  the RDC
Funds ceased to be beneficial owners of any Common Shares.

          (d) Not Applicable.

          (e) On  April  7,  2000,  pursuant  to the  terms  of the  partnership
agreements  of the RDC Funds set forth in Exhibits  99.3  through 99.5 in Item 7
below, the RDC Funds distributed the Common Shares of which they were the record
holders to the  limited  partners  in the RDC  Funds,  in  accordance  with such
limited  partners'  limited  partnership   interests.   Immediately  after  such
distributions,  the RDC Funds  ceased  to be  beneficial  owners  of any  Common
Shares.

Item 6. Contracts, Arrangements, Understandings or Relationships with respect to
Securities of the Issuer.

          Acadia Realty Trust,  the General  Partner,  Yale,  YURPSE,  Carnegie,
Vanderbilt,  TRW, Harvard,  Stanford, HHMI and Five Arrows have agreed, pursuant
to the terms of the  lock-up  agreement  set forth in Exhibit No. 99.6 in Item 7
below (the  "Lock-Up"),  to extend  through  December 28, 2000 the term of their
agreements described in Exhibits 99.3 through 99.5 in Item 7 below, to not sell,
transfer,  convey, assign, pledge or hypothecate 17,061,238 of the Common Shares
beneficially  owned by such Reporting  Persons.  Such  Reporting  Persons may be
considered a group with respect the terms of the Lock-Up.

          Other than as described herein, there are no contracts, understandings
or  relationships  (legal or otherwise) among the persons named in Item 2 hereof
and between  such persons or any person with  respect to any  securities  of the
Trust  including  but not  limited  to  transfer  or voting of any of the Common
Shares,  finder's fees,  joint ventures,  loan or option  arrangements,  puts or
calls,  guarantees  or profits,  division  of profits or loss,  or the giving or
withholding of proxies.

Item 7.  Material to be Filed as Exhibits.

         Exhibit Number                      Description.

                  99.1                       Joint Acquisition Statement, as required by
                                             Rule 13d-1(f)1 of the Securities Act of 1934.(1)

                  99.2                       Contribution and Share Purchase Agreement,
                                             dated as of April 15, 1998, among the Trust,
                                             Mark Centers Limited Partnership and certain
                                             entities affiliated with RD Capital, Inc.(2)

                  99.3                       Second Amended and Restated Agreement of
                                             Limited Partnership of RD Properties, L.P. VI,
                                             dated as of January 1, 1998 by and among RD
                                             New York VI, LLC and the entities listed on
                                             Schedule A thereto.(1)

                  99.4                       Agreement of Limited Partnership of RD
                                             Properties, L.P. VIA, by and among RD New

- ------------------------
1.   Incorporated by reference to the statement on Schedule 13D previousy filed
     by the Reporting Persons with the Securities and Exchange Commission on
     September 16, 1998.

2.   Incorporated by reference to the proxy materials of Mark Centers Trust on
     Schedule 14A previously filed by Mark Centers Trust with the Securities
     and Exchange Commission on July 10, 1998.

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                         Page  22  of  27  Pages
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<S>                                          <C>

                                             York VI, LLC and certain other individuals and
                                             entities, dated as of May 6, 1998.(1)

                  99.5                       Agreement of Limited Partnership of RD
                                             Properties, L.P. VIB by and between RD New
                                             York VI, LLC and certain other individuals and
                                             entities, dated as of May 6, 1998.(1)

                  99.6                      Lock-Up Agreement by and among Acadia
                                            Realty Trust and Carnegie Corporation
                                            of New York, Five Arrows Realty Securities LLC,
                                            Harvard Private Capital Realty, Inc., Howard
                                            Hughes Medical Institute, The Board of Trustees
                                            of the Leland Stanford Junior University, Yale
                                            University Retirement Plan for Staff Employees
                                            and RD New York VI, LLC, dated as of March 22, 2000.(3)
- ---------------
3. Filed herewith.

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CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  22  of  27  Pages
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<S>                                                                                              <C>

                                    SIGNATURE

                  After reasonable inquiry and to the best of its knowledge and
belief, each of the undersigned certifies that the information set forth in this
statement is true, complete and correct and agrees that this statement may be
filed jointly with the other undersigned party.


Dated:   May 23, 2000


                             RD Properties, L.P. VI

                             By:   RD New York VI, LLC, its general partner



                                       BY: /s/ Ross Dworman
                                           ---------------------------------
                                           Name:  Ross Dworman
                                           Title:  Managing Member



                                       By:  /s/ Kenneth F. Bernstein
                                            --------------------------------
                                            Name:  Kenneth F. Bernstein
                                            Title:  Managing Member

                             RD Properties, L.P. VIA

                                       By:   RD New York VI, LLC, its general partner



                                       By: /s/ Ross Dworman
                                           --------------------------------
                                           Name:  Ross Dworman
                                           Title:  Managing Member



                                       By:  /s/ Kenneth F. Bernstein
                                            -------------------------------
                                            Name:  Kenneth F. Bernstein
                                            Title:  Managing Member

</TABLE>

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  23  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            -------------------------------------------


<S>                           <C>


                             RD Properties, L.P. VIB

                                       By:   RD New York VI, LLC, its general partner



                                             By: /s/ Ross Dworman
                                                 -----------------------------
                                                 Name:  Ross Dworman
                                                 Title:  Managing Member



                                             By:  /s/ Kenneth F. Bernstein
                                                  ----------------------------
                                                  Name:  Kenneth F. Bernstein
                                                  Title:  Managing Member

                             RD New York VI, LLC




                             By: /s/ Ross Dworman
                                 ---------------------------------------------
                                 Name:  Ross Dworman
                                 Title:  Managing Member




                             By:  /s/ Kenneth F. Bernstein
                                  --------------------------------------------
                                  Name:  Kenneth F. Bernstein
                                  Title:  Managing Member




                            /s/ Ross Dworman
                            --------------------------------------------------
                            Ross Dworman




                            /s/ Kenneth F. Bernstein
                            --------------------------------------------------
                            Kenneth F. Bernstein

</TABLE>

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  24  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            --------------------------------------------


<S>                           <C>


                             Yale University, a Connecticut Corporation



                             By:  /s/  Ross Dworman
                                  --------------------------------------------
                                   Ross Dworman(1)

                             Yale University Retirement Plan for Staff Employees

                             By:  State Street Bank and Trust Co., as Trustee



                             By:  /s/  Ross Dworman
                                  --------------------------------------------
                                   Ross Dworman(1)

                             Carnegie Corporation



                             By:  /s/  Ross Dworman
                                  --------------------------------------------
                                   Ross Dworman(1)

                             The Vanderbilt University



</TABLE>

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                     Page  25  of  27  Pages
           -----------                                                                       ----    ----
- --------------------------------------------                                            --------------------------------------------


<S>                            <C>


                             TRW Master Trust


                             By: Boston Safe Deposit and Trust  Company,  solely
                                 in its capacity as Trustee for the  TRW  Master
                                 Trust (as directed by TRW Investment Management
                                 Co.), and not in its individual capacity


                                 By: /s/ Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)

                             Harvard Private Capital Realty, Inc.



                                 By: /s/ Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)

                             Charlesbank Capital Partners, LLC



                                 By: /s/ Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)

                             The Board of Trustees of the Leland Stanford Junior
                             University

</TABLE>

913320.2

<PAGE>


<TABLE>
<CAPTION>



CUSIP No.  004239 10 9                                 SCHEDULE 13D                    Page  26  of  27  Pages
           -----------                                                                      ----    ----
- --------------------------------------------                                           --------------------------------------------


<S>                            <C>

                             Howard Hughes Medical Institute



                                 By: /s/  Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)


                             Five Arrows Realty Securities L.L.C.



                                 By: /s/  Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)

                             Rothschild Realty Investors II L.L.C.



                                 By: /s/  Ross Dworman
                                     -----------------------------------------
                                      Ross Dworman(1)


</TABLE>

913320.2

<PAGE>

                        (1)  Signing as authorized  representative  pursuant  to
                             the  Power  of  Attorney, dated September 15, 1998,
                             granted by each  Reporting  Person to Ross  Dworman
                             and Kenneth F. Bernstein, incorporated by reference
                             to the statement on Schedule 13D  previously  filed
                             by the Reporting  Persons with the  Securities  and
                             Exchange Commission on September 16, 1998.







                                LOCK-UP AGREEMENT


          THIS LOCK-UP AGREEMENT (this "Agreement"), is made as of March 22,
2000 by and among Acadia Realty Trust (the "Company") and Carnegie Corporation
of New York, Five Arrows Realty Securities LLC, Harvard Private Capital Realty,
Inc., Howard Hughes Medical Institute, The Board of Trustees of the Leland
Stanford Junior University, The Vanderbilt University, TRW Master Trust, Yale
University, Yale University Retirement Plan for Staff Employees and RD New York
VI, LLC ("RDNY") (collectively, the "Shareholders").

                                   BACKGROUND

          The Shareholders hold the respective common shares of beneficial
interest of the Company (the "Shares") set forth opposite their name on Schedule
A (the "Lock-Up Shares").

          The Shareholders have been partners in the following partnerships: RD
Properties, L.P. VI ("RDVI"), RD Properties, L.P. VIA ("RDVIA"), and RD
Properties, L.P. VIB ("RDVIB") (collectively, the "Partnerships").

          The Partnerships and RDNY, together with other signatories, are
parties to a Registration and Lock-up Agreement dated August 12, 1998 which
contains provisions, among others, restricting the sale of the Lock-Up Shares
(other than those Shares acquired subsequent to August 12, 1998 (the
"Post-Closing Shares")) and providing for the registration of the Lock-Up Shares
(other than the Post-Closing Shares) (as such registration provisions are
amended on or before the date of this Agreement to extend the Company's
registration obligations to December 28, 2003 (i.e. the date which is 36 months
after the outside expiration date of the Lock-Up (defined below))) (the
"Registration Rights Agreement").

          The Partnerships are governed by the following agreements
(collectively, the "Partnership Agreement(s)"): (1) RDVI: Second Amended and
Restated Agreement of Limited Partnership dated January 1, 1998; (2) RDVIA:
Agreement of Limited Partnership dated May 6, 1998 and (3) RDVIB: Agreement of
Limited Partnership dated May 6, 1998. Each of the Partnership Agreements
contains provisions restricting the sale of the Lock-Up Shares (other than the
Post-Closing Shares) which were in addition to the restrictions set forth in the
Registration Rights Agreement (such provisions, together with those contained in
the Registration Rights Agreement, are collectively referred to as the "Original
Lock-Up Provisions").


909269.5

<PAGE>



          The Original Lock-Up Provisions have expired or will shortly expire in
accordance with their terms.

          On or prior to the date of this Agreement, the Partnerships have
distributed all Lock-Up Shares (other than the Post-Closing Shares which were
previously held by the applicable Shareholder) to the Shareholders in accordance
with the respective Partnership Agreements.

          On or prior to the date of this Agreement, the Company has filed a
shelf registration statement in accordance with the Registration Rights
Agreements to permit the resale of the Lock-Up Shares (other than the
Post-Closing Shares) (the "Shelf Registration"). If the Shelf Registration has
not been declared effective by the Securities and Exchange Commission ("SEC")
within the time period set forth in this Agreement, the Lock-Up shall expire.

          The Shareholders and the Company agree that it is in their mutual best
interests to be bound by a new lock-up on the terms set forth in this Agreement.

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

          1. Lock-Up Agreement. Subject to the terms of this Agreement, each
Shareholder agrees that it will not sell, assign, pledge or otherwise transfer
("Transfer") its Lock-Up Shares until December 28, 2000 (the "Lock-Up").

          2. Permitted Transfers. The Lock-Up shall not apply to (i) a Transfer
of the Lock-Up Shares to a Permitted Transferee or (ii) a bona fide pledge of
the Lock-Up Shares (each a "Permitted Transfer"). For purposes of this
Agreement, the term "Permitted Transferee" means (i) any partner or other equity
owner of a Shareholder; (ii) any equity owner of any partner or other equity
owner of a Shareholder; (iii) members of the Immediate Family (as defined below)
of any equity owner of a Shareholder (or any equity thereof) and trusts for the
benefit of one or more members of the Immediate Family of a Shareholder (or any
equity owner thereof) created for estate and/or gift tax purposes and/or (iv)
any public charity, public foundation or charitable institution as defined in
Section 501(c)(3) of the Internal Revenue Code of 1986, as amended. For purposes
of this Agreement, the term "Immediate Family" means, with respect to any
natural person, such natural person's spouse, parents, parents-in-law,
descendants, nephews, nieces, brothers, sisters, brothers-in-law, sisters-in-law
and children-in-law. A Permitted Transfer shall not be deemed effective, and the
Company may issue stop transfer instructions to its transfer agent in connection
with a purported Transfer of the Lock-Up Shares, unless and until the transferor
shall give the Company written notice stating the name and address of the
transferee and identifying the securities which are being Transferred and the
Company shall have received the written

909269.5
                                        2

<PAGE>



agreement of the transferee to be bound by the terms of this Agreement as if an
original signatory hereto.

          3. Release Events. Without the need for further documentation, if any
of the following events shall occur (x) the Lock-Up shall expire and (y) in the
case of clause (viii) only, this Agreement shall automatically terminate:

            (i)      both Ross Dworman and Kenneth F. Bernstein are not
            executive officers of the Company and spending a substantial
            portion of their time on the management of the Company;

            (ii)     a tender offer (other than a Company Tender Offer (defined
            below)) is initiated for the Shares;

            (iii)    the Shares have been suspended from trading or have been
            delisted;

            (iv)    either Ross Dworman or Kenneth F. Bernstein are the subject
            of a governmental investigation required to be disclosed pursuant
            to Item 401(f)(2) through (6) of Regulation S-K promulgated under
            the Securities Act of 1933, as amended, or the occurrence
            of a bankruptcy with respect to the Company;

            (v)      either Ross Dworman or Kenneth F. Bernstein is not a
            member of the board of trustees of the Company;

            (vi)     either Ross Dworman or Kenneth F. Bernstein has, as a
            result of a voluntary decision, ceased to be an executive officer
            of the Company who spends a substantial portion of his time on the
            management of the Company;

            (vii)     the Shelf Registration has not been declared effective
            by the SEC on or before May 1, 2000; or

            (viii) Shareholders holding a majority of the Lock-Up Shares
            (excluding any Lock-Up Shares held by RDNY or any of its Permitted
            Transferees) vote to terminate this Agreement; provided, however,
            that neither RDNY nor any of its Permitted Transferees shall be
            entitled to vote its Lock-Up Shares in connection
            with such vote.

          4. Company Tender Offer. The Shareholders agree not to tender their
Lock-Up Shares (or any other Shares they hold) to the Company (or its
affiliates) in connection

909269.5
                                        3

<PAGE>



with any tender offer by the Company (or its affiliates) for the Company's
Shares which commences at any time prior to December 28, 2000 (a "Company Tender
Offer").

          5. Miscellaneous.

          (a) Controlling Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of New York.

          (b) Notices. All notices and other communications hereunder shall
be in writing and shall be sent by certified mail, postage prepaid,
return receipt requested; by an overnight express courier service that provides
written confirmation of delivery; or by facsimile with written confirmation by
the sending machine or with telephone confirmation of receipt, addressed as
follows:

             (i) If to Company:

                 Acadia Realty Trust
                 805 Third Avenue
                 New York, NY 10022
                 Attention: President

                 With copy to:

                 Acadia Realty Trust
                 20 Soundview Marketplace
                 Port Washington, NY 11050-2221
                 Attention: General Counsel

            (ii) If to a Shareholder, to the address
                 of such Shareholder appearing below
                 the Shareholder's signature on the
                 signature page hereof:

          Any party may alter the address to which communications or copies are
to be sent by giving notice of such change of address in conformity with the
provisions of this paragraph for the giving of notice. Notices given hereunder
shall be deemed received upon actual receipt thereof or, in the case of notice
by mail, upon two days from the date notice is first deposited in the mail in
the manner provided above

          (c) Binding Nature of Agreement. This Agreement shall be binding
upon and inure to the benefit of the Company and its
successors and assigns and shall be binding upon each Shareholder and his/its
heirs, administrators, successors and assigns.


909269.5
                                        4

<PAGE>



          (d) Execution in Counterparts. This Agreement may be executed in
any number of counterparts, each of which shall be deemed to be an original as
against any party whose signature appears thereon, and all of which shall
together constitute one and the same instrument. This Agreement shall become
binding when one or more counterparts hereof, individually taken together, shall
bear the signatures of all of the parties reflected hereon as the signatories.

          (e) Provisions Separable. The provisions of this Agreement are
independent of and separable from each other, and no provision shall be affected
or rendered invalid or unenforceable by virtue of the fact that for any reason
any other or others of them may be invalid or unenforceable in whole or in part.

          (f) Entire Agreement; Amendments. This Agreement contains the entire
understanding among the parties hereto with respect to the subject matter
hereof, and supersedes all prior and contemporaneous agreements and
understandings, inducements or conditions, express or implied, oral or written,
except as herein contained. This Agreement may not be amended or terminated
other than with the consent of Shareholders holding a majority of the Lock-Up
Shares (excluding any Lock-Up Shares held by RDNY or any of its Permitted
Transferees); provided, however, that neither RDNY nor any of its Permitted
Transferees shall be entitled to vote its Lock-Up Shares in connection with such
vote.

          (g) Section Headings. The section headings in this Agreement are for
convenience only; they form no part of this Agreement and shall not affect its
interpretation.




                            [Signature page follows]

909269.5
                                        5

<PAGE>



          IN WITNESS WHEREOF, the parties executed and delivered this Agreement
on the date first above written.


                      ACADIA REALTY TRUST


                      By:      /s/  Kenneth F. Bernstein
                               ---------------------------------------
                               Name:  Kenneth F. Bernstein
                               Title:  President


                      CARNEGIE CORPORATION OF NEW YORK


                      By:      /s/  D. Ellen Shuman
                               --------------------------------------
                               Name:  D. Ellen Shuman
                               Title:  Vice President and Chief
                                        Investment Officer

                      437 Madison Avenue
                      New York, NY 10022
                      Attn:    D. Ellen Shuman, Vice President and Chief
                               Investment Officer


                      FIVE ARROWS REALTY SECURITIES LLC


                      By:      /s/  Matthew W. Kaplan
                               -------------------------------------
                               Name:  Matthew W. Kaplan
                               Title:  Managing Director

                               c/o Rothschild Realty Inc.
                               1251 Avenue of the Americas
                               New York, NY 10020
                               Attn:  Matthew W. Kaplan, Sr. Vice President




909269.5
                                        6

<PAGE>



                      HARVARD PRIVATE CAPITAL REALTY,
                      INC.


                      By:      /s/  William P. Douglas
                               ------------------------------------
                               Name:  William P. Douglas
                               Title:  Managing Director

                      600 Atlantic Avenue
                      Boston, Massachusetts  02210-2203
                      Attn:    Andrew DiMatteo, Vice President


                      HOWARD HUGHES MEDICAL INSTITUTE


                      By:      /s/  Mark A. Barnard
                               -----------------------------------
                               Name:  Mark A. Barnard
                               Title:  Director - Private Investments

                      4000 Jones Bridge Road
                      Chevy Chase, Maryland  20815-6789
                      Attn:    Mark Barnard, Director - Private
                               Investments


                      THE BOARD OF TRUSTEES OF THE
                      LELAND STANFORD JUNIOR UNIVERSITY


                      By:      /s/  Larry S. Owen
                               ------------------------------------
                               Name:  Larry S. Owen
                               Title:  Director of Real Estate Investments

                      Stanford Management Company
                      2770 Sand Hill Road
                      Menlo Park, California  94025
                      Attn:    Larry S. Owen, Director of Real Estate
                               Investments




909269.5
                                        7

<PAGE>



                      THE VANDERBILT UNIVERSITY


                      By:      /s/  William T. Spitz
                               -----------------------------------
                               Name:  William T. Spitz
                               Title:  Treasurer

                      Office of the Treasurer
                      2100 West End Avenue, Suite 900
                      Nashville, Tennessee  37240
                      Attn:    William T. Spitz, Treasurer


                      TRW INVESTMENT MANAGEMENT
                      COMPANY

                      By:      Boston Safe Deposit and Trust Company,
                               solely in its capacity as Trustee for the
                               TRW Master Trust (as directed by TRW
                               Investment Management Co.), and not in its
                               individual capacity


                               By:      /s/  Carole Bruno
                                        -----------------------------
                                        Name:  Carole Bruno
                                        Title:  Authorized Signatory

                      TRW Investment Management Company
                      1900 Richmond Road
                      Cleveland, Ohio  44124
                      Attn:    Brian S. Schneider, Senior Portfolio
                               Manager

                      The decision to participate in the investment, any
                      representations made herein by the participant, and any
                      actions taken hereunder by the participant has/have
                      been made solely at the direction of the investment
                      fiduciary who has sole investment discretion with
                      respect to this investment.





909269.5
                                        8

<PAGE>



                      YALE UNIVERSITY


                      By:      /s/  David F. Swensen
                               -------------------------------------
                               Name:  David F. Swensen
                               Title:  Chief Investment Officer

                      Yale Investments Office
                      230 Prospect Street
                      New Haven, CT 06511
                      Attn:    David Swensen, Chief Investment Officer


                      YALE UNIVERSITY RETIREMENT PLAN
                      FOR STAFF EMPLOYEES


                      By:      /s/  David C. Crawford
                               ------------------------------------
                               Name:  David C. Crawford
                               Title:  Senior Vice President

                      230 Prospect Street
                      New Haven, CT 06511
                      Attn:    Alan Forman, Director of Investments


                      RD NEW YORK VI, LLC


                      By:      /s/  Ross Dworman
                               ------------------------------------
                               Name:  Ross Dworman
                               Title:  Member

                      20 Soundview Marketplace
                      Port Washington, NY 11050





909269.5
                                        9

<PAGE>

<TABLE>
<CAPTION>

                                   SCHEDULE A

                                 Lock-Up Shares


Name                                                    Lock-Up Shares Held     Percentage Held1
- ----                                                    -------------------     ---------------
<S>                                                            <C>                  <C>
Carnegie Corporation of New York                               942,653              5.5691
Five Arrows Realty Securities LLC                            3,266,667             19.2991
Harvard Private Capital Realty, Inc.                         2,000,000             11.8157
Howard Hughes Medical Institute                              2,266,667             13.3912
The Board of Trustees of the Leland
Stanford Junior University                                   2,133,333             12.6035
The Vanderbilt University                                    1,346,647              7.9558
TRW Master Trust                                             1,200,000              7.0894
Yale University                                              3,366,616              19.8895
Yale University Retirement Plan for
Staff Employees                                                403,994              2.3867
RD New York VI, LLC                                            134,661                --
                                                               -------               ---
                  TOTALS                                    17,061,238            100.0000%
                                                            ==========            =========

- --------
1    Percentages are calculated by excluding any Lock-Up Securities held by RDNY.


</TABLE>

909269.5
                                       10



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