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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">UNITED
      STATES</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">SECURITIES
      AND EXCHANGE COMMISSION</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
      D.C. 20549</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">FORM
      8-K</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT
      REPORT</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">PURSUANT
      TO SECTION 13 OR 15(d) OF THE</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECURITIES
      EXCHANGE ACT OF 1934</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 234pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
      of
      Report (Date of earliest event reported)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">August
      31, 2006</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">STRUCTURED
      ASSET SECURITIES CORPORATION (as Depositor under the Trust Agreement dated
      as of
      August 1, 2006, providing for the issuance of Lehman XS Trust Mortgage
      Pass-Through Certificates, Series 2006-13)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div align="center">
      <table border="0" cellpadding="0" cellspacing="0" width="80%">

          <tr>
            <td valign="top" width="80%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Lehman
                XS Trust 2006-13</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="80%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
                Name of Issuing Entity)</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="80%">&#160;</td>
          </tr>
          <tr>
            <td valign="top" width="80%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Structured
                Asset Securities Corporation</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="80%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
                Name of Registrant as Specified in its Charter)</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="80%">&#160;</td>
          </tr>
          <tr>
            <td valign="top" width="80%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Lehman
                Brothers Holdings Inc.</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="80%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
                Name of Sponsor as Specified in its
                Charter)</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="20%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Delaware&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
            </td>
            <td width="2%">&#160;</td>
            <td valign="top" width="20%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">333-133985</font></div>
            </td>
            <td width="2%">&#160;</td>
            <td valign="top" width="20%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">74-2440850&#160;&#160;&#160;</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="20%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(State
                or Other Jurisdiction</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Of
                Incorporation)</font></div>
            </td>
            <td width="2%">&#160;</td>
            <td valign="top" width="20%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Commission</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">File
                Number)</font></div>
            </td>
            <td width="2%">&#160;</td>
            <td valign="top" width="20%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(I.R.S.
                Employer</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Identification
                No.)</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div><br>
      <div align="left">
        <table cellpadding="0" cellspacing="0" width="100%">

            <tr>
              <td valign="bottom" width="20%" style="border-bottom: black thin solid;">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">745
                  Seventh Avenue, 7</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><sup>th</sup></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
                  Floor</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">New
                  York, NY </font></div>
              </td>
              <td width="24%">&#160;</td>
              <td valign="bottom" width="20%" style="border-bottom: black thin solid;">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10019</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="20%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Address
                  of Principal Executive Offices)</font></div>
              </td>
              <td width="24%">&#160;</td>
              <td valign="top" width="20%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Zip
                  Code)</font></div>
              </td>
            </tr>

        </table>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Registrant&#8217;s
      telephone number, including area code: (212) 526-7000</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="80%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">No
                Change</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="80%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Former
                Name or Former Address, if Changed Since Last
                Report)</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div><br>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
      8.01. </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Other
      Events</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Registrant registered issuances of Lehman XS Trust Mortgage Pass-Through
      Certificates Series 2006-13, on a delayed or continuous basis pursuant to Rule
      415 under the Securities Act of 1933, as amended (the &#8220;Act&#8221;), by a Registration
      Statement on Form S-3 (Registration File No. 333-133985) (the &#8220;Registration
      Statement&#8221;). Pursuant to the Registration Statement, the Registrant issued
      approximately $1,014,999,000 in aggregate principal amount of </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
      1-A1, Class 1-A2, Class 1-A3, Class 1-A4, Class 1-A5, Class 2-A1, Class 1-M1,
      Class 1-M2, Class 1-M3, Class 1-M4, Class 1-M5, Class 1-M6, Class 1-M7, Class
      1-M8, Class 1-M9, Class M-</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10,
      Class
      2-M1, Class 2-M2, Class 2-M3, Class 2-M4, Class 2-M5 and Class 2-M6 Lehman
      XS
      Trust Mortgage Pass-Through Certificates, Series 2006-13 on August 31, 2006.
      This Current Report on Form 8-K is being filed to satisfy an undertaking,
      contained in the definitive Prospectus dated August 11, 2006, as supplemented
      by
      the Prospectus Supplement dated August 30, 2006 (the &#8220;Prospectus Supplement&#8221;) to
      file a copy of the Trust Agreement (as defined below) and other operative
      agreements executed in connection with the issuance of the Certificates, a
      form
      of which was filed as an exhibit to the Registration Statement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Offered Certificates (as defined herein) and the Other Certificates (as defined
      herein) were issued pursuant to a Trust Agreement (the &#8220;Trust Agreement&#8221;),
      attached hereto as </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibit
      4.1</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">,
      dated
      as of August 1, 2006, among Structured Asset Securities Corporation, as
      depositor, Citibank, N.A., as Trustee and Aurora Loan Services LLC, as master
      servicer. The &#8220;Offered Certificates&#8221; consist of the following classes: Class
      1-A1, Class 1-A2, Class 1-A3, Class 1-A4, Class 1-A5, Class 2-A1, Class 1-M1,
      Class 1-M2, Class 1-M3, Class 1-M4, Class 1-M5, Class 1-M6, Class 1-M7, Class
      1-M8, Class 1-M9, Class M-10, Class 2-M1, Class 2-M2, Class 2-M3, Class 2-M4,
      Class 2-M5 and Class 2-M6. The Offered Certificates and the &#8220;Other Certificates&#8221;
(consisting of the Class 1-P, Class 2-P, Class C-X, Class S-X, Class 1-X, Class
      2-X, Class LT-R-1, Class LT-R-2, Class R-1 and Class R-2 Certificates), evidence
      all of the beneficial ownership interest in a trust fund (the &#8220;Trust Fund&#8221;) the
      assets of which will primarily consist of two pools consisting of conventional,
      first lien, adjustable and fixed rate, fully amortizing and balloon residential
      mortgage loans (the &#8220;Mortgage Loans&#8221;) with an aggregate outstanding principal
      balance of approximately $1,019,603,404 as of August 1, 2006, together with
      certain other assets. Capitalized terms used herein and not otherwise defined
      shall have the meanings assigned to them in the Trust Agreement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      August
      31, 2006, the following classes of certificates in the following amounts were
      sold by the registrant to affiliates of the registrant in private placements
      in
      reliance on Section 4(2) of the Securities Act of 1933:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div align="center">
      <table border="1" bordercolor="#000000" cellpadding="0" cellspacing="0" width="80%">

          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Class</strong></font></div>
            </td>
            <td valign="top" width="30%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Initial
                Principal Balance</strong></font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                1-P</font></div>
            </td>
            <td valign="top" width="30%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$100</font></div>
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            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                2-P</font></div>
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            <td valign="top" width="30%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$100</font></div>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                C-X</font></div>
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            <td valign="top" width="30%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">N/A</font></div>
            </td>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                S-X</font></div>
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            <td valign="top" width="30%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">N/A</font></div>
            </td>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                1-X</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">N/A</font></div>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                2-X</font></div>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                LT-R-1</font></div>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                LT-R-2</font></div>
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          <tr>
            <td valign="top" width="25%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Class
                R-1</font></div>
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            <td valign="top" width="25%" style="border-bottom: black thin solid;">
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                R-2</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      net
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      assets.</font></div><br>
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      <div id="FTR">
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        </div>
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      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">2</font></div>
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      9.01. </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Financial
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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    <div align="left">
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          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
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            <td align="left" valign="top" width="85%">
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                Agreement dated as of August 1, 2006, among Structured Asset Securities
                Corporation, as Depositor, Citibank, N.A., as Trustee and Aurora
                Loan
                Services LLC, as Master Servicer.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1
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            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
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            </td>
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          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
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            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
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                Agreement dated as of August 1, 2006, among Aurora Loan Services
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                as
                Seller.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.3</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Reconstituted
                Servicing Agreement dated as of August 1, 2006, among IndyMac Bank,
                F.S.B., as Servicer, and Lehman Brothers Holdings Inc., as
                Seller.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.4</font></div>
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            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Interest
                Rate Swap Agreement, dated as of August 31, 2006 (including schedule,
                trade confirm and ISDA Master Agreement), each between HSBC Bank
                USA,
                National Association and Lehman XS Trust, Series
                2006-13.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.5</font></div>
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            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Interest
                Rate Cap Agreement, dated as of August 31, 2006 (including schedule,
                trade
                confirm and ISDA Master Agreement), each between Lehman Brothers
                Special
                Financing Inc. and Lehman XS Trust, Series
                2006-13.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div><br>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">3</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Exchange Act of 1934, the Registrant
      has
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      duly authorized.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">
      <table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">

          <tr valign="top" bgcolor="#ffffff">
            <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
          </tr>
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            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">STRUCTURED
              ASSET
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">By:&#160;&#160;</font></td>
            <td><font size="2">/s/ Ellen V. Kiernan</font></td>
          </tr>
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                Ellen V. Kiernan</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Times New Roman">Title:
                Senior Vice President</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Dated:
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div><br>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">4</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
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      INDEX</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
    </div>
    <div align="left">
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%"><u><font size="2">Exhibit
              No.</font></u></td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%"><u><font size="2">Description</font></u></td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">4.1
                </font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Trust
                Agreement dated as of August 1, 2006, among Structured Asset Securities
                Corporation, as Depositor, Citibank, N.A., as Trustee and Aurora
                Loan
                Services LLC, as Master Servicer.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1
                </font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Mortgage
                Loan Sale and Assignment Agreement dated as of August 1, 2006, between
                Lehman Brothers Holdings Inc., as Seller, and Structured Asset Securities
                Corporation, as Purchaser.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.2</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Servicing
                Agreement dated as of August 1, 2006, among Aurora Loan Services
                LLC, as
                Master Servicer and Servicer, and Lehman Brothers Holdings Inc.,
                as
                Seller.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.3</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Reconstituted
                Servicing Agreement dated as of August 1, 2006, among IndyMac Bank,
                F.S.B., as Servicer, and Lehman Brothers Holdings Inc., as
                Seller.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.4</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Interest
                Rate Swap Agreement, dated as of August 31, 2006 (including schedule,
                trade confirm and ISDA Master Agreement), each between HSBC Bank
                USA,
                National Association and Lehman XS Trust, Series
                2006-13.</font></div>
            </td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">&#160;</td>
          </tr>
          <tr>
            <td width="5%">&#160;</td>
            <td align="left" valign="top" width="9%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.5</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="85%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Interest
                Rate Cap Agreement, dated as of August 31, 2006 (including schedule,
                trade
                confirm and ISDA Master Agreement), each between Lehman Brothers
                Special
                Financing Inc. and Lehman XS Trust, Series
                2006-13.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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{"company-data": {"conformed-name": "Lehman XS 2006-13", "cik": "0001373533", "assigned-sic": "6189", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-133985-06", "film-number": "061093079"}, "business-address": {"street1": "745 7TH AVENUE", "city": "NEW YORK", "state": "NY", "zip": "10019", "phone": "2125267000"}, "mail-address": {"street1": "745 7TH AVENUE", "city": "NEW YORK", "state": "NY", "zip": "10019"}}
Unassociated Document
UNITED
      STATES
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 (Date of earliest event reported)
August
      31, 2006
STRUCTURED
      ASSET SECURITIES CORPORATION (as Depositor under the Trust Agreement dated
      as of
      August 1, 2006, providing for the issuance of Lehman XS Trust Mortgage
      Pass-Through Certificates, Series 2006-13)
Lehman
                XS Trust 2006-13
(Exact
                Name of Issuing Entity)
Structured
                Asset Securities Corporation
(Exact
                Name of Registrant as Specified in its Charter)
Lehman
                Brothers Holdings Inc.
(Exact
                Name of Sponsor as Specified in its
                Charter)
Delaware
333-133985
74-2440850
(State
                or Other Jurisdiction
Of
                Incorporation)
(Commission
File
                Number)
(I.R.S.
                Employer
Identification
                No.)
745
                  Seventh Avenue, 7
th
Floor
New
                  York, NY
10019
(Address
                  of Principal Executive Offices)
(Zip
                  Code)
Registrant's
      telephone number, including area code: (212) 526-7000
No
                Change
(Former
                Name or Former Address, if Changed Since Last
                Report)
Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:
¨
Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))
Item
      8.01.
Other
      Events
The
      Registrant registered issuances of Lehman XS Trust Mortgage Pass-Through
      Certificates Series 2006-13, on a delayed or continuous basis pursuant to Rule
      415 under the Securities Act of 1933, as amended (the "Act"), by a Registration
      Statement on Form S-3 (Registration File No. 333-133985) (the "Registration
      Statement"). Pursuant to the Registration Statement, the Registrant issued
      approximately $1,014,999,000 in aggregate principal amount of
Class
      1-A1, Class 1-A2, Class 1-A3, Class 1-A4, Class 1-A5, Class 2-A1, Class 1-M1,
      Class 1-M2, Class 1-M3, Class 1-M4, Class 1-M5, Class 1-M6, Class 1-M7, Class
      1-M8, Class 1-M9, Class M-
10,
      Class
      2-M1, Class 2-M2, Class 2-M3, Class 2-M4, Class 2-M5 and Class 2-M6 Lehman
      XS
      Trust Mortgage Pass-Through Certificates, Series 2006-13 on August 31, 2006.
      This Current Report on Form 8-K is being filed to satisfy an undertaking,
      contained in the definitive Prospectus dated August 11, 2006, as supplemented
      by
      the Prospectus Supplement dated August 30, 2006 (the "Prospectus Supplement") to
      file a copy of the Trust Agreement (as defined below) and other operative
      agreements executed in connection with the issuance of the Certificates, a
      form
      of which was filed as an exhibit to the Registration Statement.
The
      Offered Certificates (as defined herein) and the Other Certificates (as defined
      herein) were issued pursuant to a Trust Agreement (the "Trust Agreement"),
      attached hereto as
Exhibit
      4.1
,
      dated
      as of August 1, 2006, among Structured Asset Securities Corporation, as
      depositor, Citibank, N.A., as Trustee and Aurora Loan Services LLC, as master
      servicer. The "Offered Certificates" consist of the following classes: Class
      1-A1, Class 1-A2, Class 1-A3, Class 1-A4, Class 1-A5, Class 2-A1, Class 1-M1,
      Class 1-M2, Class 1-M3, Class 1-M4, Class 1-M5, Class 1-M6, Class 1-M7, Class
      1-M8, Class 1-M9, Class M-10, Class 2-M1, Class 2-M2, Class 2-M3, Class 2-M4,
      Class 2-M5 and Class 2-M6. The Offered Certificates and the "Other Certificates"
(consisting of the Class 1-P, Class 2-P, Class C-X, Class S-X, Class 1-X, Class
      2-X, Class LT-R-1, Class LT-R-2, Class R-1 and Class R-2 Certificates), evidence
      all of the beneficial ownership interest in a trust fund (the "Trust Fund") the
      assets of which will primarily consist of two pools consisting of conventional,
      first lien, adjustable and fixed rate, fully amortizing and balloon residential
      mortgage loans (the "Mortgage Loans") with an aggregate outstanding principal
      balance of approximately $1,019,603,404 as of August 1, 2006, together with
      certain other assets. Capitalized terms used herein and not otherwise defined
      shall have the meanings assigned to them in the Trust Agreement.
On
      August
      31, 2006, the following classes of certificates in the following amounts were
      sold by the registrant to affiliates of the registrant in private placements
      in
      reliance on Section 4(2) of the Securities Act of 1933:
Class
Initial
                Principal Balance
Class
                1-P
$100
Class
                2-P
$100
Class
                C-X
N/A
Class
                S-X
N/A
Class
                1-X
N/A
Class
                2-X
N/A
Class
                LT-R-1
N/A
Class
                LT-R-2
N/A
Class
                R-1
N/A
Class
                R-2
N/A
The
      net
      proceeds from the sale of these certificates were applied by the registrant
      toward the purchase of the mortgage loans constituting the pool
      assets.
2
Item
      9.01.
Financial
      Statements and Exhibits
(a)
Not
      applicable.
(b)
Not
      applicable.
(c)
Not
      applicable.
(d)
Exhibits:
4.1
Trust
                Agreement dated as of August 1, 2006, among Structured Asset Securities
                Corporation, as Depositor, Citibank, N.A., as Trustee and Aurora
                Loan
                Services LLC, as Master Servicer.
99.1
Mortgage
                Loan Sale and Assignment Agreement dated as of August 1, 2006, between
                Lehman Brothers Holdings Inc., as Seller, and Structured Asset Securities
                Corporation, as Purchaser.
99.2
Servicing
                Agreement dated as of August 1, 2006, among Aurora Loan Services
                LLC, as
                Master Servicer and Servicer, and Lehman Brothers Holdings Inc.,
                as
                Seller.
99.3
Reconstituted
                Servicing Agreement dated as of August 1, 2006, among IndyMac Bank,
                F.S.B., as Servicer, and Lehman Brothers Holdings Inc., as
                Seller.
99.4
Interest
                Rate Swap Agreement, dated as of August 31, 2006 (including schedule,
                trade confirm and ISDA Master Agreement), each between HSBC Bank
                USA,
                National Association and Lehman XS Trust, Series
                2006-13.
99.5
Interest
                Rate Cap Agreement, dated as of August 31, 2006 (including schedule,
                trade
                confirm and ISDA Master Agreement), each between Lehman Brothers
                Special
                Financing Inc. and Lehman XS Trust, Series
                2006-13.
3
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.
STRUCTURED
              ASSET
              SECURITIES CORPORATION
By:
/s/ Ellen V. Kiernan
Name:
                Ellen V. Kiernan
Title:
                Senior Vice President
Dated:
      August 31, 2006
4
EXHIBIT
      INDEX
Exhibit
              No.
Description
4.1
Trust
                Agreement dated as of August 1, 2006, among Structured Asset Securities
                Corporation, as Depositor, Citibank, N.A., as Trustee and Aurora
                Loan
                Services LLC, as Master Servicer.
99.1
Mortgage
                Loan Sale and Assignment Agreement dated as of August 1, 2006, between
                Lehman Brothers Holdings Inc., as Seller, and Structured Asset Securities
                Corporation, as Purchaser.
99.2
Servicing
                Agreement dated as of August 1, 2006, among Aurora Loan Services
                LLC, as
                Master Servicer and Servicer, and Lehman Brothers Holdings Inc.,
                as
                Seller.
99.3
Reconstituted
                Servicing Agreement dated as of August 1, 2006, among IndyMac Bank,
                F.S.B., as Servicer, and Lehman Brothers Holdings Inc., as
                Seller.
99.4
Interest
                Rate Swap Agreement, dated as of August 31, 2006 (including schedule,
                trade confirm and ISDA Master Agreement), each between HSBC Bank
                USA,
                National Association and Lehman XS Trust, Series
                2006-13.
99.5
Interest
                Rate Cap Agreement, dated as of August 31, 2006 (including schedule,
                trade
                confirm and ISDA Master Agreement), each between Lehman Brothers
                Special
                Financing Inc. and Lehman XS Trust, Series
                2006-13.
5