MACK CALI REALTY CORP
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<TITLE>Exhibit 10.10</TITLE>
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<P ALIGN="Right"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Exhibit 10.10</B> </FONT></P>


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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>MACK-CALI REALTY
CORPORATION </FONT></H1>

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>TAX GROSS UP AGREEMENT </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>AGREEMENT</B>
(&#147;Agreement&#148;) effective as of December 2, 2003 by and between Mack-Cali Realty
Corporation (the &#147;Company&#148;) and Michael Grossman (&#147;Employee&#148;). </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>,
pursuant to the 2000 Employee Stock Option Plan of Mack-Cali Realty Corporation (the
&#147;Plan&#148;), the Company, on December 2, 2003, awarded six thousand one hundred
(6,100) shares (&#147;Restricted Shares&#148;) of the Company&#146;s common stock, par
value $.01 per share (&#147;Company&#146;s Common Stock&#148;) to the Employee subject to
the terms, conditions, and restrictions set forth in the Plan, the Restricted Share Award
Agreement between the Employee and the Company dated December 2, 2003 (hereinafter,
&#147;Restricted Share Award Agreement&#148;); and </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>,
the Company wishes to provide the Employee with a tax gross up payment upon the date of
grant applicable to such Restricted Shares; </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>NOW
THEREFORE</B>, the parties hereto hereby agree as follows: </FONT></P>

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<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          Employee
shall receive a tax gross-up payment in an amount equal to one hundred           five
thousand three hundred fifty dollars ($105,350) (the &#147;Tax Gross-Up           Payment&#148;)
from the Company.  </FONT>
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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
Tax Gross-Up Payment shall be made as soon as practicable following the date           of
grant but in no event later than December 31, 2003.  </FONT>
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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
Company shall have the right to deduct and withhold from the Tax Gross-Up
          Payment all social security and other federal, state and local taxes and
charges           which currently are or which hereafter may be required by law to be so
deducted           and withheld.  </FONT>
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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          Nothing
in this Agreement shall confer on the Employee any right to continue as           an
employee of the Company or in any way affect the Company&#146;s or any
          subsidiary&#146;s right to terminate the Employee&#146;s employment at any time
          subject to the terms of the Employee&#146;s employment agreement.  </FONT>
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<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          This
Agreement contain the entire understanding of the parties with respect to           the
payment of the Tax Gross-Up Payment and this Agreement shall not be modified           or
amended except in writing and duly signed by each of the parties.  </FONT>
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<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          This
Agreement shall be governed by the laws of the State of New Jersey           applicable
to contracts made, and to be enforced, within the State of New           Jersey.  </FONT>
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<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          This
Agreement shall be binding upon and inure to the benefit of the successors,
          assigns and heirs of the respective parties.  </FONT>
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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>IN
WITNESS WHEREOF,</B> the parties hereto have executed this Agreement to be effective on
the date first above written. </FONT></P>



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<TD WIDTH=50%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Mack-Cali Realty Corporation</B><BR><BR>
<BR>By:&nbsp;/s/ MITCHELL E. HERSH<BR>&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;<BR>
Mitchell E. Hersh<BR>Chief Executive Officer</FONT></TD>
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<TD WIDTH=50%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Employee</B><BR><BR>
<BR>/s/ MICHAEL GROSSMAN<BR>&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;&#151;<BR>
Michael Grossman<BR></FONT></TD>
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