- -------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION FORM 5 WASHINGTON, D.C. 20549 - -------- / / CHECK BOX IF NO LONGER ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP SUBJECT TO SECTION 16. FORM 4 OR FORM 5 OBLI- Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, GATIONS MAY CONTINUE. Section 17(a) of the Public Utility Holding Company Act of 1935 or SEE INSTRUCTION 1(b). Section 30(f) of the Investment Company Act of 1940 / / FORM 3 HOLDINGS REPORTED / / FORM 4 TRANSACTIONS REPORTED - ------------------------------------------------------------------------------------------------------------------------------------ 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) Gantcher Nathan Mack-Cali Realty Corporation (CLI) X Director 10% Owner ---- ---- - ------------------------------------------------------------------------------------------- Officer (give Other (specify (Last) (First) (Middle) 3. IRS or Social Security 4. Statement for ---- title ---- below) Number of Reporting Month/Year below) c/o Mack-Cali Realty Corporation Person (Voluntary) 11 Commerce Drive June 1999 -------------------------- - ------------------------------------------- ------------------------------------------------------------- (Street) 5. If Amendment, 7. Individual or Joint/Group Filing Date of Original (check applicable line) (Month/Day/Year) X Form filed by One Reporting Person --- Form filed by More than One Reporting Person Cranford, New Jersey 07016 --- - ------------------------------------------------------------------------------------------------------------------------------------ (City) (State) (Zip) TABLE I -- NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED - ------------------------------------------------------------------------------------------------------------------------------------ 1. Title of Security 2. Trans- 3. Transac- 4. Securities Acquired (A) or 5. Amount of 6. Owner- 7. Nature of (Instr. 4) action tion Disposed of (D) Securities ship Indirect Date Code (Instr. 3, 4 and 5) Beneficially Form: Beneficial (Month/ (Instr. 8) Owned at Direct Ownership Day/ end of (D) or (Instr. 4) Year) ------------------------------------------- Issuer's Indirect Code V Amount (A) or Price Fiscal Year (I) (D) (Instr. 3 and 4) - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ *If the form is filed by more than one reporting person, SEE instruction 4(b)(v). (Over) SEC 2270 (7/96)

FORM 5 (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. Trans- 5. Number of 6. Date Exer- (Instr. 3) sion of action action Derivative cisable and Exercise Date Code Securities Ac- Expiration Price of (Month/ (Instr. 8) quired (A) or Date Deriv- Day/ Disposed of Month/Day/ ative Year) (D) Year) Security (Instr. 3, 4, and 5) -------------------- Date Expir- ----------------------------------- Exer- ation cisable Date Code V (A) (D) - ------------------------------------------------------------------------------------------------------------------------ Phantom Stock Units 1-for-1 6/30/99 A V 59.643 (1) (1) - ------------------------------------------------------------------------------------------------------------------------ Phantom Stock Units 1-for-1 9/30/99 A V 146.974 (1) (1) - ------------------------------------------------------------------------------------------------------------------------ Phantom Stock Units 1-for-1 12/31/99 A V 155.884 (1) (1) - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------

7. Title and Amount of Under- 8. Price of Deriv- 9. Number of 10. Ownership Form 11. Nature of lying Derivative Securities ative Security Derivative of Derivative Indirect (Instr. 3 and 4) (Instr. 5) Securities Bene- Security: Direct (D) Beneficial ficially Owned or Indirect (I) Ownership at End of Month (Instr. 4) (Instr. 4) - ------------------------------------ (Instr. 4) Amount or Title Number of Shares - ------------------------------------------------------------------------------------------ Common Stock 59.643 $30.25 59.643 D - ------------------------------------------------------------------------------------------ Common Stock 146.974 $26.3125 206.617 D - ------------------------------------------------------------------------------------------ Common Stock 155.884 $25.3750 362.501 D - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------ Explanation of Responses: (1) The phantom stock units were accrued under the Mack-Cali Realty Corporation Deferred Compensation Plan for Directors and are to be settled 100% in Mack-Cali Realty Corporation common stock upon the termination of the reporting person's service on the Board of Directors of Mack-Cali Realty Corporation or upon a change in control of Mack-Cali Realty Corporation. /s/ Nathan Gantcher 2/14/00 ----------------------------------- ----------- **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 provided is insufficient, SEE Instruction 6 for procedure. Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number. Page 2 SEC 2270 (7-96)