FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Crockett Deidre
 2. Date of Event Requiring Statement (Month/Day/Year)
12/23/2019		 3. Issuer Name and Ticker or Trading Symbol
MACK CALI REALTY CORP [CLI]
(Last)
(First)
(Middle)
C/O MACK-CALI REALTY CORPORATION, HARBORSIDE 3, 210 HUDSON ST., STE. 400		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, Chief Admin. Officer
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

JERSEY CITY, NJ 07311		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 1,493
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Class H 2019 LTIP Units   (1)   (1) Common Stock 3,351 $ 0 (2) D  
Class F 2018 LTIP Units   (3)   (3) Common Stock 4,720 $ 0 (4) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Crockett Deidre
C/O MACK-CALI REALTY CORPORATION
HARBORSIDE 3, 210 HUDSON ST., STE. 400
JERSEY CITY, NJ 07311		       EVP, Chief Admin. Officer  

Signatures

/s/ Deidre Crockett 01/02/2020
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) The Class H 2019 LTIP Units (the "Class H Units") vest on March 22, 2022 and are not subject to expiration.
(2) The Class H Units are a class of units of Mack-Cali Realty, L.P. (the "Operating Partnership") that, following the occurrence of certain events and upon vesting are convertible by the holder into an equivalent number of Common Units. Common Units of the Operating Partnership are redeemable by the holder for cash or, at the election of Mack-Cali Realty Corporation (the "Company"), shares of common stock of the Company on a one-for-one basis or the cash value of such shares.
(3) The Class F 2018 LTIP Units (the "Class F Units") vest on April 20, 2021 and are not subject to expiration.
(4) The Class F Units are a class of units of the Operating Partnership that, following the occurrence of certain events and upon vesting are convertible by the holder into an equivalent number of Common Units. Common Units of the Operating Partnership are redeemable by the holder for cash or, at the election of the Company, shares of common stock of the Company on a one-for-one basis or the cash value of such shares.

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