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 *
MACK DAVID S
  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
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O MACK-CALI REALTY CORPORATION, 11 COMMERCE DRIVE
3. Date of Earliest Transaction (Month/Day/Year)
01/15/2004
(Street)

CRANFORD, NJ 07016
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 01/15/2004   A(1)   1,000 (1) A $ 0 (1) 1,000 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
Director Stock Option (Right to Buy) $40.55 01/15/2004   A   5,000   01/15/2005(2) 01/15/2014 Common Stock 5,000 $40.55 5,000 D  
Units of Limited Partnership Interest (3) $ 0 (3)             12/11/1998 08/08/1988(4) Common Stock 727,438   727,438 (7) D  
Series B Preferred Units of Limited Partnership (5) $34.65 (6)             12/11/1999 08/08/1988(4) Common Stock 1,539,509   53,344 (7) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MACK DAVID S
C/O MACK-CALI REALTY CORPORATION
11 COMMERCE DRIVE
CRANFORD, NJ 07016
  X      

Signatures

 /s/ David S. Mack   01/20/2004
**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 January 15, 2004, the reporting person was granted 1,000 restricted shares of Common Stock pursuant to the Amended and Restated 2000 Director Stock Option Plan of Mack-Cali Realty Corporation (the "Corporation"). The shares shall vest on January 1, 2005.
(2) On January 15, 2004, the reporting person was granted an option to purchase 5,000 shares of Common Stock. The option vests on January 15, 2005.
(3) The Units of Limited Partnership Interest (the "Common Units") represent interests in Mack-Cali Realty, L.P., a Delaware limited partnership, (the "Operating Partnership") through which the Corporation conducts its real estate activities. The Common Units are redeemable on a one-for-one basis for shares of Common Stock of the Corporation.
(4) The right to convert units of the Operating Partnership is not subject to expiration.
(5) The Series B Preferred Units of Limited Partnership Interest (the "Series B Preferred Units") represent interests in the Operating Partnership.
(6) The 53,344 Series B Preferred Units are convertible into 1,539,509 Common Units of the Operating Partnership. The 53,344 Series B Preferred Units represent $53,344,000 of stated value of such units. Therefore, the conversion price of the 1,539,509 Common Units is $34.65.
(7) The reporting person did not execute any transactions in such securities, and this beneficial ownership information is being provided for information purposes only in connection with the appointment of the reporting person to the Board of Directors of the Corporation on January 15, 2004.

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