UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4) ACADIA REALTY TRUST (Name of Issuer) Common Shares of Beneficial Interest, $.001 par value (Title of Class of Securities) 004239 10 9 (CUSIP Number of Class of Securities) Kenneth Miller, Esq. Yale University 55 Whitney Avenue New Haven, CT 06510-1300 (203) 432-0120 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) Copy to: Michael W. Blair, Esq. Debevoise & Plimpton 919 Third Avenue New York, NY 10022 (212) 909-6000 November 4, 2004 (Date of Event which Requires Filing Statement on Schedule 13D) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box [X]. Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 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 purposes 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 (however, see the Notes). (Continued on following pages)

Schedule 13D CUSIP No. 004239 10 9 - -------------------------------------------------------------------------------- (1) Name of Reporting Person S.S. or I.R.S. Identification No. of Above Person Yale University I.R.S. Identification No. 06-0646973-N - -------------------------------------------------------------------------------- (2) Check the Appropriate Box if a Member of a Group (a) |_| (b) |_| - -------------------------------------------------------------------------------- (3) SEC Use Only - -------------------------------------------------------------------------------- (4) Source of Funds WC - -------------------------------------------------------------------------------- (5) Check 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 NUMBER OF 4,422,231 SHARES ---------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 212,136 EACH ---------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON WITH 4,422,231 ---------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 212,136 - -------------------------------------------------------------------------------- (11) Aggregate Amount Beneficially Owned by Each Reporting Person 4,634,367 - -------------------------------------------------------------------------------- (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares - -------------------------------------------------------------------------------- (13) Percent of Class Represented by Amount in Row (11) 15.8% - -------------------------------------------------------------------------------- (14) Type of Reporting Person EP - -------------------------------------------------------------------------------- Page 2 of 7

Amendment No. 4 to Schedule 13D The statement on Schedule 13D (the "Statement") filed on September 25, 2002, as amended by Amendment Nos. 1, 2 and 3 thereto filed on March 23, 2004, March 26, 2004 and March 31, 2004, respectively, relating to the common shares of beneficial interest, par value $.001 per share (the "Common Shares") of Acadia Realty Trust, a Maryland real estate investment trust (the "Trust"), is hereby amended and supplemented as set forth below in this Amendment No. 4 to the Statement by Yale University, a Connecticut corporation (the "Reporting Person"). Capitalized terms used below and not otherwise defined herein shall have the meaning set forth in the Statement, as so amended. Item 4. Purpose of Transaction The disclosure in Item 4 is hereby amended and supplemented by adding the following: "On November 4, 2004, the Reporting Person, YURPSE and Kenneth F. Bernstein ("Bernstein", and together with the Reporting Person and YURPSE, the "November Selling Stockholders"), the Trust and Acadia Realty Limited Partnership and Citigroup Global Markets Inc., as representative of the several underwriters (the "Underwriters") entered into an underwriting agreement (the "November Underwriting Agreement") in connection with the planned disposition by the November Selling Shareholders' and Trust's planned disposition (the "November Offering") of up to 3,000,000 Common Shares pursuant to an effective registration statement on file with the Securities and Exchange Commission (including up to 450,000 Common Shares subject to the Underwriters' overallotment option (the "Over-allotment Option")). Pursuant to the November Underwriting Agreement, the Underwriters will acquire 954,225 Common Shares held by the Reporting Person and 45,775 Common Shares held by YURPSE at a price of $15.35 per share (the "Offering Price"), less underwriters discounts and commissions of $0.27 per share (the "Underwriting Discount") in connection with the public resale of the Common Shares. In addition, the Underwriters have a Over-allotment Option to purchase up to 143,134 Common Shares held by the Reporting Person and 6,866 Common Shares held by YURPSE within 30 days of the date of the November Underwriting Agreement, at the Offering Price less the Underwriting Discount." Item 5. Interest in Securities of the Issuer The disclosure in Item 5(a) is hereby amended and restated to read in its entirety as follows: "(a) The Reporting Person beneficially owns, within the meaning of Rule 13d-3 under the Exchange Act, 4,634,367 Common Shares. The Common Shares owned by the Reporting Person constitute approximately 15.8% of the Common Shares issued and Page 3 of 7

outstanding (computed on the basis of 29,299,224 Common Shares issued and outstanding, as reported in the Trust's Prospectus Supplement, dated November 4, 2004, to the Prospectus dated March 29, 2000, Prospectus dated May 14, 2003 and Prospectus dated March 19, 2004 filed with the Securities and Exchange Commission on November 8, 2004)." Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer The disclosure in the last three paragraphs of Item 6 are hereby amended and restated to read in their entirety as follows: "Pursuant to custody agreements between each of the Reporting Person and YURPSE and the Trust, as custodian, dated as of November 4, 2004 (the "Custody Agreements"), 1,097,359 Common Shares beneficially owned by the Reporting Person and 52,641 Common Shares beneficially owned by YURPSE were deposited or deemed to be deposited with the Trust for the benefit of the Underwriters in connection with the November Underwriting Agreement. The Reporting Person and YURPSE remain the owners of such Common Shares (subject to the interests of the Underwriters under the November Underwriting Agreement and the Custody Agreements) and have the right to vote and to receive all dividends and distributions with respect to such Common Shares until payment in full for the Common Shares has been made by the Underwriters according to the terms of the November Underwriting Agreement. The Trust becomes obligated to return the certificates deposited with the Trust under the Custody Agreements if the November Underwriting Agreement is not fully executed and delivered, if the November Underwriting Agreement is terminated, or if the Common Shares to be sold by each of the Reporting Person and YURPSE pursuant to the November Underwriting Agreement are not purchased and paid for by the Underwriters on or before November 15, 2004. Pursuant to lock-up agreements entered into by each of the Reporting Person and YURPSE and the Underwriters, dated as of November 4, 2004 (the "Lock-up Agreements"), the Reporting Person and YURPSE agree that they will not, without the prior written consent of the Underwriters, dispose of any of their Common Shares, options or warrants to acquire Common Shares, or securities exchangeable or exercisable for or convertible into Common Shares currently or hereafter owned either of record or beneficially by them, or publicly announce an intention to do any of the foregoing, for a period of ninety (90) days after the date of the prospectus relating to the November Offering. The Reporting Person and YURPSE also agree to the entry, by the Trust, of stop transfer instructions, which shall remain in effect during this period, with the Trust's transfer agent and registrar. The Lock-up Agreements become effective upon the execution of the November Underwriting Agreement and terminate if for any reason the November Underwriting Agreement is terminated prior to the Closing thereunder. Other than the Voting Trust Agreement, the November Underwriting Agreement the Custody Agreements and the Lock-up Agreements, there are no contracts, understandings or relationships (legal or otherwise) among the persons named in Item 2 Page 4 of 7

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 The disclosure in Item 7 is hereby supplemented by adding the following in appropriate numerical order: 6. Underwriting Agreement, dated as of November 4, 2004, by and between Acadia Realty Trust, Acadia Realty Limited Partnership, Yale University, The Yale University Retirement Plan for Staff Employees and Kenneth F. Bernstein and Citigroup Global Markets Inc. as representative of the several underwriters (incorporated by reference to Exhibit 1.1 to the Trust's Current Report of Form 8-K filed on November 8, 2004). 7. Custody Agreement Re: Sale of Common Shares of Acadia Realty Trust, dated as of November 4, 2004, between Acadia Realty Trust, as custodian, and Yale University. 8. Custody Agreement Re: Sale of Common Shares of Acadia Realty Trust, dated as of November 4, between Acadia Realty Trust, as custodian, and The Yale University Retirement Plan for Staff Employees. 9. Lock-up Agreement, dated as of November 4, 2004, granted by Yale University to Citigroup Global Markets, Inc., as representative of the several underwriters. 10. Lock-up Agreement, dated as of November 4, 2004, granted by The Yale University Retirement Plan for Staff Employees to Citigroup Global Markets, Inc., as representative of the several underwriters. Page 5 of 7

SIGNATURE After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: November 4, 2004 YALE UNIVERSITY By: /s/ David F. Swensen ------------------------------- Name: David F. Swensen Title: Chief Investment Officer Page 6 of 7

Exhibit Index 6. Underwriting Agreement, dated as of November 4, 2004, by and between Acadia Realty Trust, Acadia Realty Limited Partnership, Yale University, The Yale University Retirement Plan for Staff Employees and Kenneth F. Bernstein and Citigroup Global Markets Inc. as representative of the several underwriters (incorporated by reference to Exhibit 1.1 to the Trust's Current Report of Form 8-K filed on November 8, 2004). 7. Custody Agreement Re: Sale of Common Shares of Acadia Realty Trust, dated as of November 4, 2004, between Acadia Realty Trust, as custodian, and Yale University. 8. Custody Agreement Re: Sale of Common Shares of Acadia Realty Trust, dated as of November 4, 2004, between Acadia Realty Trust, as custodian, and The Yale University Retirement Plan for Staff Employees. 9. Lock-up Agreement, dated as of November 4, 2004, granted by Yale University to Citigroup Global Markets, Inc., as representative of the several underwriters. 10. Lock-up Agreement, dated as of November 4, 2004, granted by The Yale University Retirement Plan for Staff Employees to Citigroup Global Markets, Inc., as representative of the several underwriters.

EXHIBIT 7 CUSTODY AGREEMENT RE: SALE OF COMMON SHARES OF ACADIA REALTY TRUST THIS CUSTODY AGREEMENT (this "Agreement"), made as of the 4th day of November 2004, between Acadia Realty Trust, as Custodian (the "Custodian"), and Yale University (the "Selling Shareholder") provides: 1. The Selling Shareholder is the owner of common shares of beneficial interest, $.001 par value per share (the "Common Shares") of Acadia Realty Trust, a self administered Maryland real estate investment trust (the "Company"), and proposes to sell 954,225 Common Shares and, at the election of the Underwriters (as defined herein), up to an aggregate of 143,134 additional Common Shares solely to cover over-allotments (collectively, the "Shares") pursuant to an underwriting agreement in substantially the form attached to the Power of Attorney (as defined herein) to be entered into among the Company, Acadia Realty Limited Partnership, certain underwriters named therein (the "Underwriters"), the Selling Shareholder and the persons listed on Schedule B of the underwriting agreement (the "Underwriting Agreement"). The Selling Shareholder acknowledges and consents to changes to the form of Underwriting Agreement attached to the Power of Attorney, provided that such changes shall not materially and adversely affect the Selling Shareholder. Concurrently with the execution and delivery of this Agreement, the Selling Shareholder has executed a Power of Attorney to Kenneth F. Bernstein and Robert Masters, and each of them individually (the "Attorney-in-Fact"), authorizing the Attorney-in-Fact to sell the Shares pursuant to the Underwriting Agreement. 2. The Selling Shareholder herewith delivers (i) to the Custodian for safekeeping the certificates listed on SCHEDULE I hereto and/or (ii) a copy of an executed DWAC Letter (as defined below), which collectively represent not less than the number of the Shares to be sold by the Selling Shareholder pursuant to the Underwriting Agreement. Each such certificate has been duly endorsed in blank or is accompanied by a separate form of assignment duly executed in blank, in either case with the signature of the holder of record guaranteed by a bank or trust company, or by a firm having membership on the New York Stock Exchange, in proper form to permit the transfer on the books of the Company of the Shares represented by such certificates. The foregoing are to be held by the Custodian pursuant to the provisions of this Agreement. With regard to any Shares held in book-entry form or "street-name" that will be used by the Selling Shareholder to fulfill its obligations under the Underwriting Agreement, the Selling Shareholder shall execute and deliver to the transfer agent a Deposit/Withdrawal at Custodian Letter ("DWAC Letter") in the form attached as EXHIBIT 1 hereto. Upon execution of the DWAC Letter by the transfer agent, the Shares subject to the DWAC Letter shall be deemed to be deposited with the Custodian and shall be held by the transfer agent as a subcustodian on behalf of the Custodian pursuant to the provisions of this Agreement and the letter of instruction from the Company to the transfer agent, and all references herein to the Custodian shall be deemed to include the transfer agent, as subcustodian.

3. The Selling Shareholder agrees that the Shares deposited under this Agreement are for the benefit of and coupled with and subject to the interests of the Underwriters, that the arrangements made by the Selling Shareholder for such custody are to that extent irrevocable, and that the obligations of the Selling Shareholder under this Agreement and under the Underwriting Agreement shall not be terminated by operation of law or by termination of authority of the Selling Shareholder, or by the death or incapacity, or liquidation or dissolution, as applicable, of the Selling Shareholder, or by the occurrence of any other event not provided for in the Underwriting Agreement. If the Selling Shareholder should die or become incapacitated, or be liquidated or dissolved, or if any such other event should occur before the delivery of the Shares as provided in the Underwriting Agreement, certificates for the Shares to be sold shall be delivered by the Custodian in accordance with the terms and conditions of the Underwriting Agreement and this Agreement, as if such death, incapacity, liquidation, dissolution or other event had not occurred, regardless of whether the Custodian shall have received notice thereof. 4. The Selling Shareholder hereby authorizes and directs the Custodian as follows: (a) The Custodian shall hold for safekeeping and deliver the certificates deposited with it hereunder pursuant to the terms of this Agreement and the Underwriting Agreement when so directed by the Attorney-in-Fact and make such other appropriate arrangements for safekeeping of such certificates; (b) At any time after receipt of the certificates deposited with it pursuant to this Agreement, the Custodian shall permit the Company's transfer agent to examine them, together with any related stock powers, certificates of qualification or other documents, so as to satisfy the transfer agent that the Custodian holds the Shares in deliverable and transferable form; (c) The Custodian shall continue to hold the initial certificates for the Shares, the stock powers, and other related documents referred to in subsection (b) of this Section 4 and, within the period required by Section 2 of the Underwriting Agreement and otherwise subject to the provisions of the Underwriting Agreement, shall cause to be issued new certificates for the Shares and shall deliver the certificates for the Shares and related papers, upon payment therefor in accordance with the pricing information shown on the cover page of the final Prospectus and the Underwriting Agreement, to such person or persons as the Custodian shall have been directed to do, in writing, by Citigroup Global Markets Inc., acting on behalf of the Underwriters, in accordance with the Underwriting Agreement; (d) The Custodian shall, on behalf of the Selling Shareholder, acknowledge receipt of the proceeds from the sale of the Shares and, if necessary or as contemplated by Section 5 below, deposit the proceeds attributable to the Shares in one or more special accounts or escrow arrangements or accounts; and (e) The Custodian shall promptly return to the Selling Shareholder new certificates for the unsold balance, if any, of the Shares covered by the accompanying certificates or direct the transfer agent, as subcustodian, to transfer to such Selling Shareholder's account at the broker-dealer from which any Shares in book-entry form or "street name" were transferred. -1-

5. Upon completion of the sale of the Shares to the Underwriters pursuant to the terms of the Underwriting Agreement, the Custodian is authorized and directed to pay immediately to the Selling Shareholder the proceeds from the sale of the Shares net of (i) the Underwriters' discount, (ii) the Selling Shareholder's proportionate share of the costs and expenses of the Offering as set forth in Section 4 of the Underwriting Agreement, and (iii) any withholding taxes required to be withheld by the Company for federal income tax purposes, and after such payment the Custodian shall have no further responsibility hereunder. 6. If the Underwriting Agreement shall not be fully executed and delivered or if it shall be terminated pursuant to its terms, or if the Shares are not purchased and paid for by the Underwriters on or before November 15, 2004, the Custodian is directed (A) to return promptly to the Selling Shareholder (i) the certificates and related stock powers deposited by it with the Custodian hereunder or (ii) if such certificates have been reissued in accordance with Section 2 of the Underwriting Agreement, new certificates registered in such name or names as the Custodian shall have been directed, in writing, by the Selling Shareholder and (B) to direct the transfer agent, as subcustodian, to return any Shares in book-entry form or "street name" to the Selling Shareholder's account at such broker-dealer from which such Shares were transferred. Upon the return of such certificates and/or return of such Shares, the Custodian shall have no further responsibility hereunder. 7. Until payment in full for the Shares has been made by the Underwriters according to the terms of the Underwriting Agreement, the Selling Shareholder shall remain the owner of the Shares (subject to the interests of the Underwriters under the Underwriting Agreement and this Agreement) and shall have the right to vote and to receive all dividends and distributions with respect to such Shares. Until the Custodian is obligated to return the certificates deposited hereunder (or reissue certificates) pursuant to Section 6 hereof, the Selling Shareholder agrees not to give, sell, further pledge, hypothecate, otherwise transfer, or contract with respect to all or any part of the Shares, or any interests therein, except in accordance with the Underwriting Agreement. 8. The Selling Shareholder hereby certifies that it has full right, power and authority to enter into this Agreement, the aforementioned Power of Attorney and the Underwriting Agreement, and to sell the Shares to be sold pursuant to the Underwriting Agreement, and that, except as otherwise set forth in this Agreement, at the time of delivery to the Custodian it has valid and marketable title to the Shares, free and clear of all liens, encumbrances, mortgages, pledges and charges. 9. The Custodian's execution of this Agreement shall evidence its acknowledgment of receipt of the certificates designated on Schedule I hereto and shall constitute the acceptance by the Custodian of the authorizations and duties herein contained and the agreement of the Custodian to carry out and perform its duties under this Agreement. 10. It is understood that the Custodian is authorized to accept this Agreement and to take any and all actions hereunder as the Custodian shall, in its discretion, deem necessary or appropriate, and that the Custodian assumes no responsibility or liability to the undersigned or to -2-

any person other than as provided for in this Agreement. The Custodian shall act hereunder as a custodian only and is not responsible or liable in any manner whatsoever for the sufficiency, correctness, genuineness or validity of the Shares delivered to the Custodian or for the form or execution thereof, or for the identity or authority of any person executing or depositing such Shares. Except as herein expressly provided, the Custodian shall not be liable for any error of judgment or for any act done or omitted or for any mistake of fact or law, except for the Custodian's gross negligence, bad faith or willful misconduct in the performance of its duties as custodian. The undersigned agrees that the Custodian may consult with counsel for the Company, and the Custodian shall have full and complete authorization and protection for any action taken by it hereunder in good faith and in accordance with the opinion of such counsel. The undersigned further agrees that the Custodian shall not be liable to the undersigned for the delegation of its duties and obligations under this Agreement, and the undersigned hereby authorizes the Custodian to delegate such duties and obligations to a subcustodian which is a financial institution reasonably selected by the Custodian or the Company's transfer agent for its Common Shares, provided the Custodian shall be solely responsible for such subcustodian's fees and expenses and for any indemnification of such subcustodian. 11. The Custodian shall be entitled to act and rely upon any statement, request, notice or instruction respecting this Agreement given by the Attorney-in-Fact which is not manifestly in bad faith. 12. This Agreement may be altered or amended only in writing and with the consent of all the parties hereto. 13. This Agreement may be executed in any number of counterparts, which together shall constitute one and the same instrument. 14. This Agreement for all purposes shall be governed by and construed in accordance with the laws of New York without regard to its conflicts of laws, principles or rules to the extent they would require application of the laws of another jurisdiction except such as are mandatorily applicable. 15. If any provision of this Agreement shall be held or deemed to be, or shall in fact be, inoperative or unenforceable as applied in any particular case or circumstance in any jurisdiction, such determination shall not affect the validity or enforceability of the remaining provisions of this Agreement in such jurisdiction or affect the validity or enforceability of such provision in any other jurisdiction. -3-

IN WITNESS WHEREOF, each of the parties hereto has duly executed this Agreement as of the date first above written. YALE UNIVERSITY By: /s/ David F. Swensen -------------------------------- Name: David F. Swensen Title: Chief Investment Officer Accepted as of the date hereof. ACADIA REALTY TRUST, as Custodian By: /s/ Robert Masters -------------------------------- Robert Masters Senior Vice President -4-

SCHEDULE I NAME OF SELLING SHAREHOLDER NUMBER OF SHARES TO BE SOLD (1) CERTIFICATE NUMBER(S) --------------------------- ------------------------------- --------------------- Yale University 1,097,359 Not Applicable (2) - -------------- (1) Includes up to 143,134 Common Shares that may be acquired by the Underwriters pursuant to the Underwriters' over-allotment option to be set forth in the Underwriting Agreement. (2) All Shares to be sold are subject to the DWAC Letter and will be held by the transfer agent upon issuance in certificated form. -5-

EXHIBIT 1--FORM OF DWAC LETTER November 4, 2004 American Stock Transfer & Trust Company 6201 -15th Avenue Brooklyn, NY 11219 Attn: Susan Silber Tel: 718-921-8217 Fax: 718-236-4588 Re: Secondary Offering of Common Shares by Certain Shareholders of Acadia Realty Trust Dear Ms. Silber: The undersigned, as a selling shareholder in the secondary offering of common shares in Acadia Realty Trust (the "Company") scheduled to close this month, hereby requests that American Stock Transfer & Trust Company accept a transfer into the Deposit/Withdrawal at Custodian ("DWAC") system in the amount of [TOTAL SHARES HELD] shares (the "Shares") from [BROKER'S NAME]. All or certain of the Shares are being sold by the undersigned pursuant to an underwriting agreement among the Company, certain selling shareholders named therein and Citigroup Global Markets Inc. Pursuant to a Custody Agreement between the Company and the undersigned and a Power of Attorney executed by the undersigned, the Company has been appointed custodian (the "Custodian") of the Shares with the power to effect the sale and transfer of all or certain of the Shares to the Underwriters. Upon the acceptance requested above, please issue one or more certificates representing the Shares as follows: [NAME OF SELLING SHAREHOLDER] [ADDRESS OF SELLING SHAREHOLDER] [SSN/EIN OF SELLING SHAREHOLDER] Upon issuance, please retain the above certificates in your possession on behalf of the Company as the custodian under the Custody Agreement and the Power of Attorney for the upcoming offering. Further instructions with respect to the Shares and these certificates will be provided by the Custodian at a later date. Sincerely yours, [SELLING SHAREHOLDER] By: Name: Title: -6-

EXHIBIT 8 CUSTODY AGREEMENT RE: SALE OF COMMON SHARES OF ACADIA REALTY TRUST THIS CUSTODY AGREEMENT (this "Agreement"), made as of the 4th day of November 2004, between Acadia Realty Trust, as Custodian (the "Custodian"), and The Yale University Retirement Plan For Staff Employees (the "Selling Shareholder") provides: 1. The Selling Shareholder is the owner of common shares of beneficial interest, $.001 par value per share (the "Common Shares") of Acadia Realty Trust, a self administered Maryland real estate investment trust (the "Company"), and proposes to sell 45,775 Common Shares and, at the election of the Underwriters (as defined herein), up to an aggregate of 6,866 additional Common Shares solely to cover over-allotments (collectively, the "Shares") pursuant to an underwriting agreement in substantially the form attached to the Power of Attorney (as defined herein) to be entered into among the Company, Acadia Realty Limited Partnership, certain underwriters named therein (the "Underwriters"), the Selling Shareholder and the persons listed on Schedule B of the underwriting agreement (the "Underwriting Agreement"). The Selling Shareholder acknowledges and consents to changes to the form of Underwriting Agreement attached to the Power of Attorney, provided that such changes shall not materially and adversely affect the Selling Shareholder. Concurrently with the execution and delivery of this Agreement, the Selling Shareholder has executed a Power of Attorney to Kenneth F. Bernstein and Robert Masters, and each of them individually (the "Attorney-in-Fact"), authorizing the Attorney-in-Fact to sell the Shares pursuant to the Underwriting Agreement. 2. The Selling Shareholder herewith delivers (i) to the Custodian for safekeeping the certificates listed on SCHEDULE I hereto and/or (ii) a copy of an executed DWAC Letter (as defined below), which collectively represent not less than the number of the Shares to be sold by the Selling Shareholder pursuant to the Underwriting Agreement. Each such certificate has been duly endorsed in blank or is accompanied by a separate form of assignment duly executed in blank, in either case with the signature of the holder of record guaranteed by a bank or trust company, or by a firm having membership on the New York Stock Exchange, in proper form to permit the transfer on the books of the Company of the Shares represented by such certificates. The foregoing are to be held by the Custodian pursuant to the provisions of this Agreement. With regard to any Shares held in book-entry form or "street-name" that will be used by the Selling Shareholder to fulfill its obligations under the Underwriting Agreement, the Selling Shareholder shall execute and deliver to the transfer agent a Deposit/Withdrawal at Custodian Letter ("DWAC Letter") in the form attached as EXHIBIT 1 hereto. Upon execution of the DWAC Letter by the transfer agent, the Shares subject to the DWAC Letter shall be deemed to be deposited with the Custodian and shall be held by the transfer agent as a subcustodian on behalf of the Custodian pursuant to the provisions of this Agreement and the letter of instruction from the Company to the transfer agent, and all references herein to the Custodian shall be deemed to include the transfer agent, as subcustodian.

3. The Selling Shareholder agrees that the Shares deposited under this Agreement are for the benefit of and coupled with and subject to the interests of the Underwriters, that the arrangements made by the Selling Shareholder for such custody are to that extent irrevocable, and that the obligations of the Selling Shareholder under this Agreement and under the Underwriting Agreement shall not be terminated by operation of law or by termination of authority of the Selling Shareholder, or by the death or incapacity, or liquidation or dissolution, as applicable, of the Selling Shareholder, or by the occurrence of any other event not provided for in the Underwriting Agreement. If the Selling Shareholder should die or become incapacitated, or be liquidated or dissolved, or if any such other event should occur before the delivery of the Shares as provided in the Underwriting Agreement, certificates for the Shares to be sold shall be delivered by the Custodian in accordance with the terms and conditions of the Underwriting Agreement and this Agreement, as if such death, incapacity, liquidation, dissolution or other event had not occurred, regardless of whether the Custodian shall have received notice thereof. 4. The Selling Shareholder hereby authorizes and directs the Custodian as follows: (a) The Custodian shall hold for safekeeping and deliver the certificates deposited with it hereunder pursuant to the terms of this Agreement and the Underwriting Agreement when so directed by the Attorney-in-Fact and make such other appropriate arrangements for safekeeping of such certificates; (b) At any time after receipt of the certificates deposited with it pursuant to this Agreement, the Custodian shall permit the Company's transfer agent to examine them, together with any related stock powers, certificates of qualification or other documents, so as to satisfy the transfer agent that the Custodian holds the Shares in deliverable and transferable form; (c) The Custodian shall continue to hold the initial certificates for the Shares, the stock powers, and other related documents referred to in subsection (b) of this Section 4 and, within the period required by Section 2 of the Underwriting Agreement and otherwise subject to the provisions of the Underwriting Agreement, shall cause to be issued new certificates for the Shares and shall deliver the certificates for the Shares and related papers, upon payment therefor in accordance with the pricing information shown on the cover page of the final Prospectus and the Underwriting Agreement, to such person or persons as the Custodian shall have been directed to do, in writing, by Citigroup Global Markets Inc., acting on behalf of the Underwriters, in accordance with the Underwriting Agreement; (d) The Custodian shall, on behalf of the Selling Shareholder, acknowledge receipt of the proceeds from the sale of the Shares and, if necessary or as contemplated by Section 5 below, deposit the proceeds attributable to the Shares in one or more special accounts or escrow arrangements or accounts; and (e) The Custodian shall promptly return to the Selling Shareholder new certificates for the unsold balance, if any, of the Shares covered by the accompanying certificates or direct the transfer agent, as subcustodian, to transfer to such Selling Shareholder's account at the broker-dealer from which any Shares in book-entry form or "street name" were transferred. -2-

5. Upon completion of the sale of the Shares to the Underwriters pursuant to the terms of the Underwriting Agreement, the Custodian is authorized and directed to pay immediately to the Selling Shareholder the proceeds from the sale of the Shares net of (i) the Underwriters' discount, (ii) the Selling Shareholder's proportionate share of the costs and expenses of the Offering as set forth in Section 4 of the Underwriting Agreement, and (iii) any withholding taxes required to be withheld by the Company for federal income tax purposes, and after such payment the Custodian shall have no further responsibility hereunder. 6. If the Underwriting Agreement shall not be fully executed and delivered or if it shall be terminated pursuant to its terms, or if the Shares are not purchased and paid for by the Underwriters on or before November 15, 2004, the Custodian is directed (A) to return promptly to the Selling Shareholder (i) the certificates and related stock powers deposited by it with the Custodian hereunder or (ii) if such certificates have been reissued in accordance with Section 2 of the Underwriting Agreement, new certificates registered in such name or names as the Custodian shall have been directed, in writing, by the Selling Shareholder and (B) to direct the transfer agent, as subcustodian, to return any Shares in book-entry form or "street name" to the Selling Shareholder's account at such broker-dealer from which such Shares were transferred. Upon the return of such certificates and/or return of such Shares, the Custodian shall have no further responsibility hereunder. 7. Until payment in full for the Shares has been made by the Underwriters according to the terms of the Underwriting Agreement, the Selling Shareholder shall remain the owner of the Shares (subject to the interests of the Underwriters under the Underwriting Agreement and this Agreement) and shall have the right to vote and to receive all dividends and distributions with respect to such Shares. Until the Custodian is obligated to return the certificates deposited hereunder (or reissue certificates) pursuant to Section 6 hereof, the Selling Shareholder agrees not to give, sell, further pledge, hypothecate, otherwise transfer, or contract with respect to all or any part of the Shares, or any interests therein, except in accordance with the Underwriting Agreement. 8. The Selling Shareholder hereby certifies that it has full right, power and authority to enter into this Agreement, the aforementioned Power of Attorney and the Underwriting Agreement, and to sell the Shares to be sold pursuant to the Underwriting Agreement, and that, except as otherwise set forth in this Agreement, at the time of delivery to the Custodian it has valid and marketable title to the Shares, free and clear of all liens, encumbrances, mortgages, pledges and charges. 9. The Custodian's execution of this Agreement shall evidence its acknowledgment of receipt of the certificates designated on Schedule I hereto and shall constitute the acceptance by the Custodian of the authorizations and duties herein contained and the agreement of the Custodian to carry out and perform its duties under this Agreement. 10. It is understood that the Custodian is authorized to accept this Agreement and to take any and all actions hereunder as the Custodian shall, in its discretion, deem necessary or appropriate, and that the Custodian assumes no responsibility or liability to the undersigned or to -3-

any person other than as provided for in this Agreement. The Custodian shall act hereunder as a custodian only and is not responsible or liable in any manner whatsoever for the sufficiency, correctness, genuineness or validity of the Shares delivered to the Custodian or for the form or execution thereof, or for the identity or authority of any person executing or depositing such Shares. Except as herein expressly provided, the Custodian shall not be liable for any error of judgment or for any act done or omitted or for any mistake of fact or law, except for the Custodian's gross negligence, bad faith or willful misconduct in the performance of its duties as custodian. The undersigned agrees that the Custodian may consult with counsel for the Company, and the Custodian shall have full and complete authorization and protection for any action taken by it hereunder in good faith and in accordance with the opinion of such counsel. The undersigned further agrees that the Custodian shall not be liable to the undersigned for the delegation of its duties and obligations under this Agreement, and the undersigned hereby authorizes the Custodian to delegate such duties and obligations to a subcustodian which is a financial institution reasonably selected by the Custodian or the Company's transfer agent for its Common Shares, provided the Custodian shall be solely responsible for such subcustodian's fees and expenses and for any indemnification of such subcustodian. 11. The Custodian shall be entitled to act and rely upon any statement, request, notice or instruction respecting this Agreement given by the Attorney-in-Fact which is not manifestly in bad faith. 12. This Agreement may be altered or amended only in writing and with the consent of all the parties hereto. 13. This Agreement may be executed in any number of counterparts, which together shall constitute one and the same instrument. 14. This Agreement for all purposes shall be governed by and construed in accordance with the laws of New York without regard to its conflicts of laws, principles or rules to the extent they would require application of the laws of another jurisdiction except such as are mandatorily applicable. 15. If any provision of this Agreement shall be held or deemed to be, or shall in fact be, inoperative or unenforceable as applied in any particular case or circumstance in any jurisdiction, such determination shall not affect the validity or enforceability of the remaining provisions of this Agreement in such jurisdiction or affect the validity or enforceability of such provision in any other jurisdiction. -4-

IN WITNESS WHEREOF, each of the parties hereto has duly executed this Agreement as of the date first above written. THE YALE UNIVERSITY RETIREMENT PLAN FOR STAFF EMPLOYEES By: STATE STREET BANK AND TRUST COMPANY, as plan trustee By: /s/ Virginia L. Knowlton ------------------------------- Name: Virginia L. Knowlton Title: Vice President Accepted as of the date hereof. ACADIA REALTY TRUST, as Custodian By: /s/ Robert Masters ------------------------------- Robert Masters Senior Vice President -5-

SCHEDULE I NAME OF SELLING SHAREHOLDER NUMBER OF SHARES TO BE SOLD (1) CERTIFICATE NUMBER(S) --------------------------- ------------------------------- --------------------- The Yale University Retirement Plan For Staff Employees 52,641 A 0579 (2) - ------------- (1) Includes up to 6,866 Common Shares that may be acquired by the Underwriters pursuant to the Underwriters' over-allotment option to be set forth in the Underwriting Agreement. (2) None of these Common Shares are subject to the DWAC Letter. -6-

EXHIBIT 1--FORM OF DWAC LETTER November 4, 2004 American Stock Transfer & Trust Company 6201 -15th Avenue Brooklyn, NY 11219 Attn: Susan Silber Tel: 718-921-8217 Fax: 718-236-4588 Re: Secondary Offering of Common Shares by Certain Shareholders of Acadia Realty Trust Dear Ms. Silber: The undersigned, as a selling shareholder in the secondary offering of common shares in Acadia Realty Trust (the "Company") scheduled to close this month, hereby requests that American Stock Transfer & Trust Company accept a transfer into the Deposit/Withdrawal at Custodian ("DWAC") system in the amount of [TOTAL SHARES HELD] shares (the "Shares") from [BROKER'S NAME]. All or certain of the Shares are being sold by the undersigned pursuant to an underwriting agreement among the Company, certain selling shareholders named therein and Citigroup Global Markets Inc. Pursuant to a Custody Agreement between the Company and the undersigned and a Power of Attorney executed by the undersigned, the Company has been appointed custodian (the "Custodian") of the Shares with the power to effect the sale and transfer of all or certain of the Shares to the Underwriters. Upon the acceptance requested above, please issue one or more certificates representing the Shares as follows: [NAME OF SELLING SHAREHOLDER] [ADDRESS OF SELLING SHAREHOLDER] [SSN/EIN OF SELLING SHAREHOLDER] Upon issuance, please retain the above certificates in your possession on behalf of the Company as the custodian under the Custody Agreement and the Power of Attorney for the upcoming offering. Further instructions with respect to the Shares and these certificates will be provided by the Custodian at a later date. Sincerely yours, [SELLING SHAREHOLDER] By: Name: Title: -7-

EXHIBIT 9 November 4, 2004 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 RE: Acadia Realty Trust (the "Company") Ladies & Gentlemen: The undersigned is an owner of record or beneficially of certain Common Shares of Beneficial Interest of the Company ("Securities") or securities convertible into or exchangeable or exercisable for Common Shares. The Company proposes to carry out a public offering of Securities (the "Offering") for which Citigroup Global Markets Inc. will act as the representative (the "Representative") of the underwriters, if any. The undersigned recognizes that the Offering will be of benefit to the undersigned and will benefit the Company and hereby acknowledges the receipt and sufficiency of other good and valuable consideration for executing this letter agreement. The undersigned further acknowledges that you and the other underwriters, if any, are relying on the representations and agreements of the undersigned contained in this letter in carrying out the Offering and in entering into an underwriting agreement (the "Underwriting Agreement") with the Company with respect to the Offering. In consideration of the foregoing, the undersigned hereby agrees that the undersigned will not, (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned's household not to), without the prior written consent of the Representative (which consent may be withheld in its sole discretion), directly or indirectly, sell, offer, contract or grant any option to sell (including without limitation any short sale), pledge, transfer, establish an open "put equivalent position" within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended, or otherwise dispose of any shares of Securities, options or warrants to acquire shares of Securities, or securities exchangeable or exercisable for or convertible into shares of Securities currently or hereafter owned either of record or beneficially (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended) by the undersigned (or such spouse or family member), or publicly announce an intention to do any of the foregoing, for a period commencing on the date hereof and continuing through the close of trading on the date ninety (90) days after the date of the Prospectus (the "Lock-Up Period"). The undersigned also agrees and consents to the entry, by the Company, of stop transfer instructions, which shall remain in effect only during the Lock-Up Period, with the Company's transfer agent and registrar against the transfer of shares of Securities or securities convertible into or exchangeable or exercisable for Securities held by the undersigned except in compliance with the foregoing restrictions or with the consent of the Representative; provided, however, that nothing herein shall prohibit (i) transfers to affiliates, family members, charitable remainder trusts or charitable institutions that agree in writing to be bound by the terms of this letter agreement or (ii) the exercise by the undersigned of outstanding stock options held by the undersigned, provided the Securities received by the undersigned upon any such exercise shall be subject to the provisions of this letter agreement during the Lock-Up Period.

If for any reason the Underwriting Agreement shall be terminated prior to the Closing Date (as defined in the Underwriting Agreement), the agreement set forth above shall likewise be terminated. This letter agreement shall become effective upon the execution of the Underwriting Agreement by all the parties named therein. Once effective, this agreement is irrevocable and will be binding on the undersigned and the respective successors, heirs, personal representatives, and assigns of the undersigned. YALE UNIVERSITY - ------------------------- Printed Name of Holder By: /s/ David F. Swensen ---------------------- Signature David F. Swensen Chief Investment Officer - ------------------------------ Printed Name of Person Signing (and indicate capacity of person signing if signing as custodian, trustee, or on behalf of an entity)

EXHIBIT 10 November 4, 2004 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 RE: Acadia Realty Trust (the "Company") Ladies & Gentlemen: The undersigned is an owner of record or beneficially of certain Common Shares of Beneficial Interest of the Company ("Securities") or securities convertible into or exchangeable or exercisable for Common Shares. The Company proposes to carry out a public offering of Securities (the "Offering") for which Citigroup Global Markets Inc. will act as the representative (the "Representative") of the underwriters, if any. The undersigned recognizes that the Offering will be of benefit to the undersigned and will benefit the Company and hereby acknowledges the receipt and sufficiency of other good and valuable consideration for executing this letter agreement. The undersigned further acknowledges that you and the other underwriters, if any, are relying on the representations and agreements of the undersigned contained in this letter in carrying out the Offering and in entering into an underwriting agreement (the "Underwriting Agreement") with the Company with respect to the Offering. In consideration of the foregoing, the undersigned hereby agrees that the undersigned will not, (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned's household not to), without the prior written consent of the Representative (which consent may be withheld in its sole discretion), directly or indirectly, sell, offer, contract or grant any option to sell (including without limitation any short sale), pledge, transfer, establish an open "put equivalent position" within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended, or otherwise dispose of any shares of Securities, options or warrants to acquire shares of Securities, or securities exchangeable or exercisable for or convertible into shares of Securities currently or hereafter owned either of record or beneficially (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended) by the undersigned (or such spouse or family member), or publicly announce an intention to do any of the foregoing, for a period commencing on the date hereof and continuing through the close of trading on the date ninety (90) days after the date of the Prospectus (the "Lock-Up Period"). The undersigned also agrees and consents to the entry, by the Company, of stop transfer instructions, which shall remain in effect only during the Lock-Up Period, with the Company's transfer agent and registrar against the transfer of shares of Securities or securities convertible into or exchangeable or exercisable for Securities held by the undersigned except in compliance with the foregoing restrictions or with the consent of the Representative; provided, however, that nothing herein shall prohibit (i) transfers to affiliates, family members, charitable remainder trusts or charitable institutions that agree in writing to be bound by the terms of this letter agreement or (ii) the exercise by the undersigned of outstanding stock options held by the undersigned, provided the Securities received by the undersigned upon any such exercise shall be subject to the provisions of this letter agreement during the Lock-Up Period.

If for any reason the Underwriting Agreement shall be terminated prior to the Closing Date (as defined in the Underwriting Agreement), the agreement set forth above shall likewise be terminated. This letter agreement shall become effective upon the execution of the Underwriting Agreement by all the parties named therein. Once effective, this agreement is irrevocable and will be binding on the undersigned and the respective successors, heirs, personal representatives, and assigns of the undersigned. THE YALE UNIVERSITY RETIREMENT PLAN FOR STAFF EMPLOYEES - ---------------------------------------- Printed Name of Holder By: State Street Bank and Trust Company as Trustee By: /s/ Virginia L. Knowlton ----------------------------------- Signature Virginia L. Knowlton Vice President - ----------------------------------- Printed Name of Person Signing (and indicate capacity of person signing if signing as custodian, trustee, or on behalf of an entity)