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 OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
DeMarco Michael J.
   2. Issuer Name and Ticker or Trading Symbol
MACK CALI REALTY CORP [CLI] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Executive Officer
(Last)
(First)
(Middle)
C/O MACK-CALI REALTY CORPORATION, HARBORSIDE 3, 210 HUDSON ST., STE. 400		 3. Date of Earliest Transaction (Month/Day/Year)
06/05/2018
(Street)

JERSEY CITY, NJ 07311		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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
Common Stock 06/05/2018   M(1)   61,471.95 A $ 0 (1) 81,324.21 D  
Common Stock 06/05/2018   D(3)   1.21 D $ 23.78 (3) 81,323 D  

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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 Stock Units $ 0 (1) 06/05/2018   M(1)     61,471.95 06/05/2018 06/05/2018 Common Stock 61,471.95 $ 0 (1) 0 (2) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
DeMarco Michael J.
C/O MACK-CALI REALTY CORPORATION
HARBORSIDE 3, 210 HUDSON ST., STE. 400
JERSEY CITY, NJ 07311		   X     Chief Executive Officer  

Signatures

 /s/ Michael J. DeMarco   06/07/2018
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On June 5, 2018, 61,471.95 Performance Stock Units vested for the reporting person and were converted to 61,471.95 shares of common stock of Mack-Cali Realty Corporation (the "Company").
(2) Reported amounts exclude the following securities directly beneficially owned by the reporting person: (i) options to purchase 400,000 shares of the Company's common stock, (ii) 118,989 Class A 2016 LTIP Units of Mack-Cali Realty, L.P. (the "Operating Partnership"), (iii) 23,041 Class B 2016 LTIP Units of the Operating Partnership, (iv) 196,482 Class C 2017 LTIP Units of the Operating Partnership, (v) 32,443 Class D 2017 LTIP Units of the Operating Partnership, (vi) 340,136 Class E 2018 LTIP Units of the Operating Partnership, and (vii) 58,997 Class F 2018 LTIP Units of the Operating Partnership. Subject to certain vesting conditions, all classes of LTIP Units of the Operating Partnership may be converted to Common Units on a one-for-one basis, which are redeemable for shares of common stock of the Company on a one-for-one basis.
(3) In connection with 6,830.26 Restricted Stock Units and 61,471.95 Performance Stock Units that vested for the reporting person on June 5, 2018, $23.78 was paid to the reporting person in respect of the aggregate of 1.21 fractional shares that vested.

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