Vornado Realty Trust

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) (Amendment No. 18) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) Prime Group Realty Trust - -------------------------------------------------------------------------------- (Name of Issuer) Common Shares of Beneficial Interest, par value $0.01 per share ------------------------- (Title of Class of Securities) 74158J103 --------- (CUSIP Number) Joseph Macnow Vornado Realty Trust 888 Seventh Avenue New York, New York 10019 (212) 894-7000 - -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) With a copy to: William G. Farrar Alan Sinsheimer Sullivan & Cromwell LLP 125 Broad Street New York, New York 10004 (212) 558-4000 June 13, 2003 -------------------------------------------------------------- (Date of Event Which Requires Filing of This Statement) If a 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 Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box [ ]. 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, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section of the Exchange Act but shall be subject to all other provisions of the Exchange Act. (Continued on following pages) (Page 1 of 7 Pages)

- -------------------- --------------------- CUSIP NO. 74158J103 PAGE 2 OF 7 PAGES - -------------------- --------------------- - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON: Vornado Realty Trust I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY): 22-1657560 - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS: AF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Maryland - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ----------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 3,972,447 EACH ----------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ----------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 7,944,893 - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,944,893 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 33.6% as calculated in accordance with Rule 13d-3(d)(1) - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON OO (real estate investment trust) -2-

- -------------------- --------------------- CUSIP NO. 74158J103 PAGE 3 OF 7 PAGES - -------------------- --------------------- - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON: Vornado Realty L.P. I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY): 13-3925979 - -------------------------------------------------------------------------------- 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 ITEM 2(d) OR 2(e) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ----------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 3,972,447 EACH ----------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ----------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 7,944,893 - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,944,893 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 33.6% as calculated in accordance with Rule 13d-3(d)(1) - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN -3-

- -------------------- --------------------- CUSIP NO. 74158J103 PAGE 4 OF 7 PAGES - -------------------- --------------------- - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON: Vornado PS, L.L.C. I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY): - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS: AF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ----------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 3,972,447 EACH ----------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ----------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 7,944,893 - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,944,893 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 33.6% as calculated in accordance with Rule 13d-3(d)(1) - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON OO (limited liability company) -4-

AMENDMENT NO. 18 TO SCHEDULE 13D RELATING TO THE COMMON SHARES OF BENEFICIAL INTEREST OF PRIME GROUP REALTY TRUST Vornado Realty Trust ("Vornado"), Vornado Realty L.P. (the "Operating Partnership") and Vornado PS, L.L.C. ("Vornado PS" and, collectively with Vornado and the Operating Partnership, the "Reporting Persons") hereby amend their Statement on Schedule 13D filed with respect to the Common Shares of Beneficial Interest, par value $0.01 per share ("Common Shares"), of Prime Group Realty Trust, a Maryland real estate investment trust (the "Issuer"). This Amendment No. 18 to Schedule 13D ("Amendment No. 18") should be read in conjunction with the Statement on Schedule 13D of the Reporting Persons filed on November 2, 2001 (the "Initial Schedule 13D"), as amended by Amendment No. 1 to Schedule 13D of the Reporting Persons filed on November 20, 2001, by Amendment No. 2 to Schedule 13D of the Reporting Persons filed on December 19, 2001, by Amendment No. 3 to Schedule 13D of the Reporting Persons filed on December 21, 2001, by Amendment No. 4 to Schedule 13D of the Reporting Persons filed on December 27, 2001, by Amendment No. 5 to Schedule 13D of the Reporting Persons filed on January 15, 2002, by Amendment No. 6 to Schedule 13D of the Reporting Persons filed on January 31, 2002, by Amendment No. 7 to Schedule 13D of the Reporting Persons filed on February 7, 2002, by Amendment No. 8 to Schedule 13D of the Reporting Persons filed on February 20, 2002, by Amendment No. 9 to Schedule 13D of the Reporting Persons filed on March 29, 2002, by Amendment No. 10 to Schedule 13D of the Reporting Persons filed on April 17, 2002, by Amendment No. 11 to Schedule 13D of the Reporting Persons filed on April 19, 2002, by Amendment No. 12 to Schedule 13D of the Reporting Persons filed on May 1, 2002, by Amendment No. 13 to Schedule 13D of the Reporting Persons filed on May 14, 2002, by Amendment No. 14 to Schedule 13D of the Reporting Persons filed on July 3, 2002, by Amendment No. 15 to Schedule 13D of the Reporting Persons filed on December 23, 2002, by Amendment No. 16 to Schedule 13D of the Reporting Persons filed on May 27, 2003, and by Amendment No. 17 to Schedule 13D of the Reporting Persons filed on June 13, 2003 (as so amended, the "Schedule 13D"). This Amendment No. 18 amends the Schedule 13D only with respect to the items listed below. Unless otherwise indicated, all capitalized terms used but not defined herein shall have the meaning ascribed to them in the Initial Schedule 13D. Pursuant to Rule 13d-4 under the Exchange Act, each of the Reporting Persons declares that the filing of this statement shall not be construed as an admission that such Reporting Person is, for the purposes of Section 13(d) or 13(g) of the Exchange Act, the beneficial owner of any Common Shares. Any disclosures made herein with respect to persons other than the Reporting Persons are made on information and belief after making appropriate inquiry. Item 4. Purpose of the Transaction. Item 4 is hereby amended by adding the following paragraphs at the end thereof: On June 13, 2003, the Issuer caused the exchange of 3,972,446 Common Units of Prime Group Realty, L.P. ("Common Units") beneficially owned by Cadim Acquisition, LLC ("Cadim Acquisition") for 3,972,446 Common Shares. As a result, Cadim Acquisition now beneficially owns -5-

3,972,446 Common Shares and no Common Units. The filing of this Schedule 13D shall not be deemed an admission that any Reporting Person is, for purposes of Section 13(d) or 13(g) of the Exchange Act, the beneficial owner of any securities held by any other person. Item 5. Interest in Securities of the Issuer. Item 5 is hereby amended by adding the following sentence at the end of paragraph (c) thereof: No transactions in the Common Shares were effected by Reporting Persons since June 12, 2003, the date of execution of the Reporting Persons most recent filing, except to the extent that such transactions may be deemed to have occurred as described in Item 4. -6-

SIGNATURES After reasonable inquiry and to the best of my knowledge and belief, each of the undersigned certifies that the information set forth in this amendment to Schedule 13D is true, complete and correct. Dated: June 17, 2003 VORNADO REALTY TRUST By: /s/ Joseph Macnow --------------------------------------- Name: Joseph Macnow Title: Executive Vice President-Finance and Administration, Chief Financial Officer VORNADO REALTY L.P. By: VORNADO REALTY TRUST, its general partner By: /s/ Joseph Macnow --------------------------------------- Name: Joseph Macnow Title: Executive Vice President-Finance and Administration, Chief Financial Officer VORNADO PS, L.L.C. By: VORNADO REALTY L.P., its sole member By: VORNADO REALTY TRUST, its general partner By: /s/ Joseph Macnow --------------------------------------- Name: Joseph Macnow Title: Executive Vice President-Finance and Administration, Chief Financial Officer -7-