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Section 1: SC 13G






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


                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934

                                (Amendment No.)*

                         Mack-Cali Realty Corporation
             -----------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
             -----------------------------------------------------
                         (Title of Class of Securities)

                                   554489104
             -----------------------------------------------------
                                 (CUSIP Number)

                               December 31, 2018
             -----------------------------------------------------
            (Date Of Event which Requires Filing of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [x] Rule 13d-1(b)

     [ ] Rule 13d-1(c)

     [ ] Rule 13d-1(d)


*  The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



      

CUSIP No.554489104                     13G                     Page 2 of 6 Pages
--------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON:
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON:

       CenterSquare Investment Management LLC:
       I.R.S. # 822740442
--------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:

       (a) [ ]

       (b) [ ]
--------------------------------------------------------------------------------
   3.  SEC USE ONLY:

--------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION:

       Delaware.
--------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER:
     SHARES            3,153,046.00
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER:
      EACH             0
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER:
      WITH:            4,906,783
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER:
                       0
--------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
       
--------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES:
       [ ]
--------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
       5.43%
--------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON:
       IA
--------------------------------------------------------------------------------

      

CUSIP No.554489104                     13G                     Page 3 of 6 Pages
--------------------------------------------------------------------------------

Item 1.     (a)   Name of Issuer:

                  Mack-Cali Realty Corporation
                  --------------------------------------------------------------
            (b)   Address of Issuer's Principal Executive Offices:

                  HARBORSIDE 3
                  210 HUDSON ST., STE. 400
                  JERSEY CITY NJ 07311
                  UNITED STATES
                  --------------------------------------------------------------
Item 2.     (a)   Name of Person Filing:

                  CENTERSQUARE INVESTMENT MANAGEMENT LLC
      
                  --------------------------------------------------------------
            (b)   Address of Principal Business Office, or if None, Residence:

                  630 West Germantown Pike, Suite 300
                  Plymouth Meeting, PA 19462
                  --------------------------------------------------------------
            (c)   Citizenship:

                  United States
                  
                  --------------------------------------------------------------
            (d)   Title of Class of Securities:

                  Common Stock
                  --------------------------------------------------------------
            (e)   CUSIP Number:

                  554489104
                  --------------------------------------------------------------

Item 3.     If this statement is filed pursuant to Sections 240.13d-1(b) or
            240.13d-2(b) or (c), check whether the person filing is a:

            (a) [ ]  Broker or dealer registered under Section 15 of the Act
                     (15 U.S.C. 78o).

            (b) [ ]  Bank as defined in Section 3(a)(6) of the Act
                     (15 U.S.C. 78c).

            (c) [ ]  Insurance company as defined in Section 3(a)(19) of the Act
                     (15 U.S.C. 78c).

            (d) [ ]  Investment company registered under Section 8 of the
                     Investment Company Act of 1940 (15 U.S.C. 80a-8).

            (e) [x]  An investment adviser in accordance with Sections
                     240.13d-1(b)(1)(ii)(E);

            (f) [ ]  An employee benefit plan or endowment fund in accordance
                     with Section 240.13d-1(b)(1)(ii)(F);

            (g) [ ]  A parent holding company or control person in accordance
                     with Section 240.13d-1(b)(1)(ii)(G);

            (h) [ ]  A savings association as defined in Section 3(b) of the
                     Federal Deposit Insurance Act (12 U.S.C. 1813);

            (i) [ ]  A church plan that is excluded from the definition of an
                     investment company under Section 3(c)(14) of the
                     Investment Company Act of 1940 (15 U.S.C. 80a-3);

            (j) [ ]  Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

      

CUSIP No.554489104                     13G                     Page 5 of 6 Pages
--------------------------------------------------------------------------------

Item 4.    Ownership as of  December 31, 2018.*

           (a) Amount beneficially owned:
			   4,906,783 shares

           (b) Percent of Class:
			   5.43%

           (c) Number of shares as to which such person has:

              (i)   Sole power to vote or to direct the vote:
                    0

              (ii)  Shared power to vote or to direct the vote:
                    3,153,046

              (iii) Sole power to dispose or to direct the disposition of:
                    4,906,783

              (iv)  Shared power to dispose or to direct the disposition of:
                    0

Item 5.    Ownership of Five Percent or Less of a Class.

           Not Applicable

Item 6.    Ownership of More Than Five Percent on Behalf of Another Person.

           The clients of CenterSquare Investment Management LLC, including
		   investment companies registered under the Investment Company Act
		   of 1940 and other managed accounts, have the right to receive 
		   dividends from as well as the proceeds from the sale of 
		   securities reported on in this statement. As of December 31, 2018,
		   no client's interest related to more than 5%.
		   

Item 7.    Identification and Classification of the Subsidiary which Acquired
           the Security Being Reported on By the Parent Holding Company.

           Not applicable

Item 8.    Identification and Classification of Members of the Group.

           Not applicable


           


      

CUSIP No.554489104                     13G                     Page 6 of 6 Pages
--------------------------------------------------------------------------------
           
Item 9.    Notice of Dissolution of Group.

           Not Applicable

Item 10.   Certification.

           By signing below I certify that, to the best of my knowledge and 
		   belief, the securities referred to above were acquired and are held  
		   in the ordinary course of business and were not acquired and are not 
		   held for the purpose of or with the effect of changing or influencing 
		   the control of the issuer of the securities and were not acquired and 
		   are not held in connection with or as a participant in any 
		   transaction having that purpose or effect, other than activities 
		   soley in connection with a nomination under Section 240.14a-11.


                                  Signature


After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Date:       February 13, 2019      

Signature:  /s/ Mike Haynes 
            --------------------------------------------------------------------

Name/Title: Associate
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