SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


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

                     Common Stock, $.01 par value per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

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


                                December 31, 2002
--------------------------------------------------------------------------------
            (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).



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CUSIP No. 554489104                   13G                      Page 2 of 8 Pages
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 1.   NAME OF REPORTING PERSON
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

           Security Capital Group Incorporated
--------------------------------------------------------------------------------
 2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                (a) [_]
                                                                (b) [_]
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 3.   SEC USE ONLY

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 4.   CITIZENSHIP OR PLACE OF ORGANIZATION

           Maryland
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                     5.   SOLE VOTING POWER

                              -0- Shares
   NUMBER OF       -------------------------------------------------------------
    SHARES           6.   SHARED VOTING POWER
 BENEFICIALLY
   OWNED BY                   -0- Shares of Common Stock
     EACH          -------------------------------------------------------------
  REPORTING          7.   SOLE DISPOSITIVE POWER
    PERSON
                              -0- Shares
                   -------------------------------------------------------------
                     8.   SHARED DISPOSITIVE POWER

                              -0- Shares of Common Stock
--------------------------------------------------------------------------------
 9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           -0- Shares of Common Stock
--------------------------------------------------------------------------------
10.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                    [_]
--------------------------------------------------------------------------------
11.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

               0% of the Shares of Common Stock
--------------------------------------------------------------------------------
12.   TYPE OF REPORTING PERSON*

               HC
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



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CUSIP No. 554489104                   13G                      Page 3 of 8 Pages
--------------------------------------------------------------------------------
 1.   NAME OF REPORTING PERSON
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

           Security Capital Research & Management Incorporated
--------------------------------------------------------------------------------
 2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                (a) [_]
                                                                (b) [_]
--------------------------------------------------------------------------------
 3.   SEC USE ONLY

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

           Delaware
--------------------------------------------------------------------------------
                     5.   SOLE VOTING POWER

                               -0- Shares
    NUMBER OF      -------------------------------------------------------------
     SHARES          6.   SHARED VOTING POWER
  BENEFICIALLY
    OWNED BY                   5,236,451 Shares of Common Stock
      EACH         -------------------------------------------------------------
   REPORTING         7.   SOLE DISPOSITIVE POWER
     PERSON
      WITH                     -0- Shares
                   -------------------------------------------------------------
                     8.   SHARED DISPOSITIVE POWER

                               5,236,451 Shares of Common Stock
--------------------------------------------------------------------------------
 9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           5,236,451 Shares of Common Stock
--------------------------------------------------------------------------------
10.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                    [_]
--------------------------------------------------------------------------------
11.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

              9.10% of the Shares of Common Stock
--------------------------------------------------------------------------------
12.   TYPE OF REPORTING PERSON*

              IA
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



Item 1(a).  Name of Issuer:

            Mack-Cali Realty Corporation

      (b).  Address of Issuer's Principal Executive Offices:

            11 Commerce Drive, Cranford, New Jersey 07016-3501

Item 2(a).  Name of Person Filing:

            Security Capital Research & Management Incorporated, a corporation
            organized and existing under the laws of Maryland ("SCR&M").

      (b).  Address of Principal Business Office or, if None, Residence:

            11 South LaSalle Street, 2/nd/ Floor, Chicago, Illinois 60603

      (c).  Citizenship:

            Delaware

      (d).  Title of Class of Securities:

            Common Stock, $.01 par value per share

      (e).  CUSIP Number:

            554489104

Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or
        (c), check whether the person filing is a:

            (a)  [_] Broker or dealer registered under Section 15 of the
                     Exchange Act;
            (b)  [_] Bank as defined in Section 3(a)(6) of the Exchange Act;
            (c)  [_] Insurance company as defined in Section 3(a)(19) of the
                     Exchange Act;
            (d)  [_] Investment company registered under Section 8 of the
                     Investment Company Act;
            (e)  [X] An investment adviser in accordance with Rule
                     13d-1(b)(1)(ii)(E);
            (f)  [_] An employee benefit plan or endowment fund in accordance
                     with Rule 13d-1(b)(1)(ii)(F);
            (g)  [_] A parent holding company or control person in accordance
                     with Rule 13d-1(b)(1)(ii)(G);
            (h)  [_] A savings association as defined in Section 3(b) of the
                     Federal Deposit Insurance Act;
            (i)  [_] A church plan that is excluded from the definition of an
                     investment company under Section 3(c)(14) of the
                     Investment Company Act;
            (j)  [_] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).



Item 4.  Ownership.

         (a). Amount Beneficially Owned:

                  SCR&M beneficially owns 5,236,451 shares of Common Stock.

         (b). Percent of Class:

                  9.10% of the Common Stock determined in accordance with the
                  provisions of Rule 13d-1 promulgated under the Act.

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

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

                         None.

                  (ii).  Shared power to vote or to direct the vote:

                         SCR&M has shared power to vote or direct the vote of
                         5,236,451 shares of Common Stock.

                  (iii). Sole power to dispose or to direct the disposition
                         of:

                         None.

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

                         SCR&M has shared power to dispose or to direct the
                         disposition of 5,236,451 shares of Common Stock

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

                  [X]
                  Security Capital Group Incorporated ("SCGI") previously filed
                  as part of this Schedule 13G by virtue of its position as the
                  parent of SCR&M. SCGI is no longer the parent corporation of
                  SCR&M and no longer beneficially owns any of the shares of
                  Common Stock reported on this Schedule 13G.

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

                  Various persons have the right to receive or the power to
                  direct the receipt of dividends from, or the proceeds from the
                  sale of, the Common Stock. No one person's interest in the
                  Common Stock is more than five percent of the total
                  outstanding Common Stock.

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.

Item 9.  Notice of Dissolution of a 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.



                                    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, 2003

                                   SECURITY CAPITAL GROUP INCORPORATED



                                   By: /s/ Jeffrey A. Klopf
                                       ---------------------
                                   Name:   Jeffrey A. Klopf
                                   Title:  Senior Vice President



                                    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, 2003

                                    SECURITY CAPITAL RESEARCH & MANAGEMENT
                                    INCORPORATED




                                    By: /S/ David T. Novick
                                       --------------------
                                    Name:   David T. Novick
                                    Title:  General Counsel