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

                                   FORM 10-Q/A
                                Amendment No. 1

(Mark One)
[ X ]  QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
       ACT OF 1934

For the quarterly period ended March 31, 1998

                                       OR
[   ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF 1934

For the transition period from ____________ to ____________

Commission file number              1-13274

                             Mack-Cali Realty Corporation
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

            Maryland                                           22-3305147
- --------------------------------------------------------------------------------
  (State or other jurisdiction                              (I.R.S. Employer
of incorporation or organization)                        Identification Number)

               11 Commerce Drive, Cranford, New Jersey 07016-3501
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                     (Address of principal executive office)
                                   (Zip Code)

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

                                 Not Applicable
- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                          if changed since last report)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934 during the  preceding  twelve  (12) months (or such shorter period that the
Registrant  was required to file such report)  YES [ X ]  NO [   ]
and (2) has been  subject to such filing  requirements  for the past ninety (90)
days YES [ X ] NO [ ]

                      APPLICABLE ONLY TO CORPORATE ISSUERS:
         Indicate  the  number of  shares  outstanding  of each of the  issuer's
classes of common stock, as of the latest practicable date.

         As of April 30, 1998,  there were 56,977,190  shares of $0.01 par value
common stock outstanding.

                                   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 thereunto duly authorized.



                                       Mack-Cali Realty Corporation
                                              (Registrant)


Date: June 9, 1998                     /s/ Thomas A. Rizk
                                       ------------------
                                       Thomas A. Rizk
                                       Chief Executive Officer
                                            


Date: June 9, 1998                     /s/ Barry Lefkowitz
                                       ------------------
                                       Barry Lefkowitz
                                       Executive Vice President &
                                         Chief Financial Officer