- -------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION FORM 4 WASHINGTON, D.C. 20549 - -------- / / CHECK THIS BOX IF NO STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP LONGER SUBJECT TO SECTION 16. FORM 4 OR Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, FORM 5 OBLIGATIONS MAY Section 17(a) of the Public Utility Holding Company Act of 1935 or CONTINUE. SEE Section 30(f) of the Investment Company Act of 1940 INSTRUCTION 1(b). (Print or Type Responses) - ------------------------------------------------------------------------------------------------------------------------------------ 1. Name and Address of Reporting Person* 2. Issuer Name and Ticker or Trading Symbol 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Gantcher Nathan Mack-Cali Realty Corporation (CLI) ---- ---- - --------------------------------------------------------------------------------------------- Officer (give Other (Last) (First) (Middle) 3. IRS or Social Security 4. Statement for ---- title ---- (specify Number of Reporting Month/Year below) below Person (Voluntary) ----------------- ------------------ c/o Mack-Cali Realty Corporation 5/01 11 Commerce Drive - -------------------------------------------- --------------------- 7. Individual or Joint/Group Filing (Street) 5. If Amendment, (Check Applicable Line) Date of Original X Form filed by One Reporting Person (Month/Year) --- Form filed by More than One Cranford, New Jersey 07016 ---Reporting Person - ------------------------------------------------------------------------------------------------------------------------------------ (City) (State) (Zip) TABLE I - NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED - ------------------------------------------------------------------------------------------------------------------------------------ 1. Title of Security 2. Trans- 3. Trans- 4. Securities Acquired (A) 5. Amount of 6. Owner- 7. Nature (Instr. 3) action action or Disposed of (D) Securities ship of In- Date Code (Instr. 3, 4 and 5) Beneficially Form: direct (Instr. 8) Owned at Direct Bene- (Month/ End of (D) or ficial Day/ ------------------------------------------- Month Indirect Owner- Year) (A) or (I) ship Code V Amount (D) Price (Instr. 3 (Instr. 4) (Instr. 4) and 4) - ------------------------------------------------------------------------------------------------------------------------------------ Common Stock 5/22/01 P 5,000 A $27.10 D - ------------------------------------------------------------------------------------------------------------------------------------ Common Stock 5/22/01 P 5,000 A $27.05 (1) I by the Gantcher Foundation - ------------------------------------------------------------------------------------------------------------------------------------ Common Stock 5/22/01 P 5,000 A $27.05 (1) I by Gantcher Family Limited Partnership - ------------------------------------------------------------------------------------------------------------------------------------ Common Stock 5/22/01 P 5,000 A $27.10 35,000(1) I by Gantcher Family 1986 Trust - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ * If the form is filed by more than one reporting person, SEE Instruction 4(b)(v). Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. (Over)

FORM 4 (CONTINUED) TABLE II - DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES) - ------------------------------------------------------------------------------------------------------------------------ 1. Title of Derivative Security 2. Conver- 3. Trans- 4. Transac- 5. Number of Deriv- 6. Date Exer- (Instr. 3) sion or action tion Code ative Securities Ac- cisable and Ex- Exercise Date (Instr. 8) quired (A) or Dis- piration Date Price of (Month/ posed of (D) (Month/Day/ Deriv- Day/ (Instr. 3, 4, and 5) Year) ative Year) Security ------------------------------------------------------------ Date Expira- Exer- tion Code V (A) (D) cisable Date - ------------------------------------------------------------------------------------------------------------------------ Director Stock Option $26.31 5/14/01 A V 5,000 5/14/02 5/14/11 (Right to Buy) - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------

- ------------------------------------------------------------------------------------------ 7. Title and Amount of Under- 8. Price 9. Number 10. Owner- 11. Nature lying Securities of of Deriv- ship of In- (Instr. 3 and 4) Deriv- ative Form direct ative Securi- of De- Bene- Secur- ties rivative ficial ity Bene- Secu- Own- (Instr. ficially rity: ership 5) Owned Direct (Instr. 4) at End (D) or Amount or of Indi- Title Number of Month rect (I) Shares (Instr. 4) (Instr. 4) - ------------------------------------------------------------------------------------------ Common Stock 5,000 5,000 D - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ Explanation of Responses: (1) The reporting person disclaims beneficial ownership of any shares of Mack-Cali Realty Corporation common stock not directly held by him. /s/ Nathan Gantcher 6/11/01 ----------------------------------- ----------- **Intentional misstatements or omissions of facts constitute **Signature of Reporting Person Date Federal Criminal Violations. SEE 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, SEE Instruction 6 for procedure. Page 2