STRUCTURED ASSET SECURITIES CORPORATION, as Depositor, AURORA LOAN SERVICES LLC, as Master Servicer, and as Trustee TRUST AGREEMENT Dated as of October 1, 2005 LEHMAN MORTGAGE TRUST MORTGAGE PASS-THROUGH CERTIFICATES SERIES 2005-1Trust Agreement • November 18th, 2005 • Lehman Mortgage Trust 2005-1 • Asset-backed securities • New York
