<Page> SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DATE OF REPORT: MAY 12, 2003 HERITAGE PROPERTY INVESTMENT TRUST, INC. (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) <Table> MARYLAND ______ 04-3474810 (STATE OR OTHER JURISDICTION OF (COMMISSION FILE NO.) (IRS EMPLOYER IDENTIFICATION NO.) INCORPORATION) 001-31297 535 BOYLSTON STREET 02116 BOSTON, MASSACHUSETTS (ZIP CODE) (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (617) 247-2200 (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE) </Table> <Page> ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS (c) Exhibits 99.1 Heritage Property Investment Trust, Inc. press release dated May 12, 2003 for the quarter ended March 31, 2003. 99.2 Heritage Property Investment Trust, Inc. Supplemental Operating and Financial Data for the quarter ended March 31, 2003. ITEM 9. REGULATION FD DISCLOSURE (FURNISHED UNDER ITEM 12, DISCLOSURE OF RESULTS OF OPERATIONS AND FINANCIAL CONDITION) On May 12, 2003, Heritage Property Investment Trust, Inc. announced its results of operations for the quarter ended March 31, 2003. A copy of the related press release is attached hereto as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference in its entirety. Following the issuance of this press release, Heritage Property Investment Trust, Inc. intends to make available certain supplemental operating and financial data regarding its operations that is too voluminous for a press release. Heritage Property Investment Trust, Inc. is attaching this supplemental operating and financial data as Exhibit 99.2 to this Current Report on Form 8-K. The information provided in this Form 8-K is being furnished under Item 12, Disclosure of Results of Operations and Financial Condition, and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific release in such a filing. <Page> SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused the report to be signed on its behalf by the undersigned, thereunto duly authorized. HERITAGE PROPERTY INVESTMENT TRUST, INC. /s/ Thomas C. Prendergast --------------------------------------- Thomas C. Prendergast Chairman, President and Chief Executive Officer /s/ David G. Gaw --------------------------------------- David G. Gaw Senior Vice President, Chief Financial Officer and Treasurer Dated: May 12, 2003 3