Sec Form 4 Filing - DeBari Giovanni M @ MACK CALI REALTY CORP - 2021-04-21

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person DeBari Giovanni M 2. Issuer Name and Ticker or Trading Symbol MACK CALI REALTY CORP [ CLI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Accounting Officer (Last) (First) (Middle) C/O MACK-CALI REALTY CORPORATION, HARBORSIDE 3, 210 HUDSON ST., STE. 400 3. Date of Earliest Transaction (MM/DD/YY) 04/21/2021 (Street) JERSEY CITY, NJ07311 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Time Vesting Restricted Stock Units 04/21/2021 A( 1 )( 2 ) 5,378 A $ 0 ( 1 ) 6,628 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Performance Vesting Restricted Stock Units $ 0 ( 3 ) 04/21/2021 A 9,966 ( 4 ) ( 4 ) Common Stock, $0.01 par value 9,966 $ 0 ( 3 ) 9,966 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other DeBari Giovanni M C/O MACK-CALI REALTY CORPORATION HARBORSIDE 3, 210 HUDSON ST., STE. 400 JERSEY CITY, NJ07311 Chief Accounting Officer Signatures /s/ Giovanni M. DeBari 04/23/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On April 21, 2021, the reporting person was granted time vesting restricted stock units (each, a "TVRSU"). Each TVRSU represents a contingent right to receive one share of common stock, $0.01 par value (the "Common Stock"), of Mack-Cali Realty Corporation (the "Company"). ( 2 )The TVRSUs vest in three equal annual installments beginning April 21, 2022. ( 3 )On April 21, 2021, the reporting person was granted performance vesting restricted stock units (each, a "PVRSU"). Each PVRSU represents represents a contingent right to receive one share of Common Stock. ( 4 )Seventy-five percent (75%) of the PVRSUs may vest over a three year period based on the attainment of absolute total stockholder return ("TSR") metrics by the Company over a three year performance period. The remaining twenty-five percent (25%) of the PVRSUs may vest over a three year period based on the Company's TSR relative to the TSR of a select group of twenty-four (24) peer REITs over the same three year performance period.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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