MOMENTA PHARMACEUTICALS INC
EX-10.7
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<TYPE>EX-10.7
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<DESCRIPTION>EX-10.7
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<p align="right" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Exhibit 10.7</font></b></p>

<p align="left" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">EXTENSION OF LEASE</font></b></p>

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<p style="margin:0in 0in .0001pt;text-indent:.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">It is agreed
between Momenta Pharmaceuticals, Inc., LESSEE, and 68 Moulton Street Realty
Trust, LESSOR, that the lease for four thousand, three hundred and sixteen
(4,316) square feet of office space located on the third floor of 68 Moulton
Street, Cambridge, MA 02138, and dated October 16, 2003 be extended for a
period of four (4) months commencing September 1, 2004 and ending December 31,
2004.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">LESSEE:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Momenta Pharmaceuticals,
Inc.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:</font></p>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7/13/2004</font></p>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">LESSOR:</font></p>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">68 Moulton Street
  Realty Trust</font></p>
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  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7/7/2004</font></p>
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