Exhibit 35 a) Depositor:  Structured Asset Securities Corporation                    745 Seventh Avenue, 8th Floor                      New York, NY 10019 Trustee:      US Bank, N.A.                    One Federal Street, 3rd Floor                    Boston, MA 02110 Securities Administrator:   Subject: Annual Officer's Certification Fiscal Year: 2006 Securitization: SAS 2006-S1 I, E. Todd Whittemore, the undersigned, a duly authorized officer of Aurora Loan Services LLC (the "Master Servicer"), do certify the following for the Calendar Year 2006: 1.    A review of the activities of the Master Servicer during the preceding calendar year (or portion thereof) and of its performance under the Agreement for such period has been made under my supervision. 2.     To the best of my knowledge, based on such review, the Master Servicer has fulfilled all of its obligations under the Agreement in all material aspects throughout 2006 (or applicable portion thereof), or, if there has been a failure to fulfill any such obligation in any material respect, I have specifically identified to the Depositor, and the Trustee each such failure known to me and the nature and status thereof,  including the steps being taken by the Master Servicer to remedy such default. Certified by: AURORA LOAN SERVICES LLC By: /s/  E. Todd Whittemore Name:  E. Todd Whittemore Title:    Executive Vice President Exhibit 35 b) AURORA LOAN SERVICES Depositor: Structured Asset Securities Corporation  Attention: Mortgage Finance SAS 2006-S1 *745*7th Avenue, 7th Floor  New York, NY 10019  Master Servicer: Aurora Loan Services LLC  Chris Baker  327 Inverness Drive South  Englewood, CO 80112  Trustee: US Bank N.A.  Structured Finance SAS 2006-S1  One Federal Street, Third Floor  Boston, Massachusetts 02110  Subject: Annual Officer's Certification  Fiscal Year: 2006  Investor Code: F75  Investor Name: SAS 2006-S1 I, Terry Gentry, the undersigned, a duly authorized officer of Aurora Loan Services LLC (the "Servicer"), do certify the following for the Calendar Year 2006:  1. A review of the activities of the Servicer during the preceding calendar year (or portion thereof) and of its performance under the Agreement for such period has been made under my supervision.  2. To the best of my knowledge, based on such review, the Servicer has fulfilled all of its obligations under the Agreement in all material aspects throughout 2006 (or applicable portion thereof), or, if there has been a failure to fulfill any such obligation in any material respect, I have specifically identified to the Master Servicer, the Depositor, and the Trustee each such failure known to me and the nature and status thereof, including the steps being taken by the Servicer to remedy such default.  Certified by: AURORA LOAN SERVICES LLC  By     /s/  Terry L. Gentry Name: Terry L. Gentry  Title: Managing Director  Exhibit 35 c) GMAC Mortgage SERVICER COMPLIANCE STATEMENT (Item 1123) GMAC Mortgage, LLC 2006-S1 The undersigned, a duly authorized officer of GMAC Mortgage, LLC, as servicer (the "Servicer"), pursuant to the applicable servicing agreement, does hereby certify that: 1.A review of the Servicer's activities during the period covered by the Issuing Entity's report on Form 10-K and of the Servicer's performance under the applicable servicing agreement has been made under my supervision. 2.To the best of my  knowledge, based on such review, the Servicer has fulfilled all of its obligations under the applicable servicing agreement in all material respects throughout such period. IN WITNESS WHEREOF, the undersigned has duly executed this Certificate this  6th day of March 2007. By:  /s/  Anthony N. Renzi Name: Anthony N. Renzi Title: Executive Vice President GMAC Mortgage, LLC  www.gmacmortgage.com 500 Enterprise Road Horsham, PA 19044