SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT

                         PURSUANT TO SECTION 13 OR 15(D)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                        Date of report: November 7, 2000
                        (date of earliest event reported)


                          MACK-CALI REALTY CORPORATION
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             (Exact name of Registrant as specified in its charter)


                                    MARYLAND
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                 (State or other jurisdiction of incorporation)


           1-13274                                           22-3305147
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    (Commission File No.)                                 (I.R.S. Employer
                                                         Identification No.)


                  11 COMMERCE DRIVE, CRANFORD, NEW JERSEY 07016
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               (Address of Principal Executive Offices) (Zip Code)


                                 (908) 272-8000
                                 --------------
              (Registrant's telephone number, including area code)


                                       N/A
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          (Former Name or Former Address, if Changed Since Last Report)

ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

         (c)      Exhibits.

                  99.1   Third Quarter 2000 Supplemental Operating and Financial
                         Data

ITEM 9.  REGULATION FD DISCLOSURE

         For the quarter ended September 30, 2000, Mack-Cali Realty Corporation
(the "Company") hereby makes available supplemental data regarding its
operations. The Company is attaching such supplemental data as Exhibit 99.1 to
this Current Report on Form 8-K.

         The information included in this Current Report on Form 8-K
(including the exhibit hereto) is furnished pursuant to Item 9 and shall not
be deemed to be "filed" for the purposes of Section 18 of the Securities
Exchange Act of 1934, as amended, or otherwise subject to the liabilities of
that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as
amended. This Report (including the exhibit hereto) will not be deemed an
admission as to the materiality of any information required to be disclosed

                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                    MACK-CALI REALTY CORPORATION


Date:  November 7, 2000            By: /s/ ROGER W. THOMAS
                                       ------------------------------------
                                       Roger W. Thomas
                                       Executive Vice President, General Counsel
                                       and Secretary

                                  EXHIBIT INDEX

         Exhibit    Document
         -------    --------

         99.1       Third Quarter 2000 Supplemental Operating and Financial Data