Structured Asset Securities Corp Mor Pas Thr Cer Sr 2001-Bc4 Sample Contracts

Structured Asset Securities Corp Mor Pas Thr Cer Sr 2001-Bc4 – Mortgage Guaranty Commitment/Certificate (June 22nd, 2001)

MGIC Mortgage Guaranty Commitment/Certificate -------------------------------------------------------------------------------- Mortgage Guaranty Insurance Corporation (the "Company"), 250 E. Kilbourn Avenue/P.O. Box 488 Milwaukee, Wisconsin 53201-0488, hereby agrees to pay to the Insured any Loss due to the Default by a Borrower on the Loan identified below, subject to the terms and conditions of the Master Policy, the conditions noted, if any, and in reliance on the Insured's application for insurance. ------------------------------------------------------------------------------------------------------------------------------------ Insured Wells Fargo Bank Minnesota, National Association, as Trustee Name for the Amortizing Residential Collateral Trust Mortgage Mailing Pass-Through Certificates, Series 2001-BC4 Address 6th and M

Structured Asset Securities Corp Mor Pas Thr Cer Sr 2001-Bc4 – OPTION ONE MORTGAGE CORPORATION, (June 22nd, 2001)

EXECUTION ================================================================================ OPTION ONE MORTGAGE CORPORATION, as Servicer and LEHMAN BROTHERS HOLDINGS INC., as Seller ----------------------------- Structured Asset Securities Corporation Amortizing Residential Collateral Trust Mortgage Pass-Through Certificates, Series 2001-BC4 SERVICING AGREEMENT Dated as of May 1, 2001 ----------------------------- ================================================================================ Table of Contents

Structured Asset Securities Corp Mor Pas Thr Cer Sr 2001-Bc4 – TERMS AGREEMENT (June 22nd, 2001)

AMORTIZING RESIDENTIAL COLLATERAL TRUST MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 2001-BC4 TERMS AGREEMENT Dated: May 31, 2001 To: Structured Asset Securities Corporation, as Depositor under the Trust Agreement dated as of May 1, 2001 (the "Trust Agreement"). Re: Underwriting Agreement Standard Terms dated as of April 16, 1996 (the "Standard Terms," and together with this Terms Agreement, the "Agreement"). Series Designation: Series 2001-BC4. Terms of the Series 2001-BC4 Certificates: Amortizing Residential Collateral Trust Mortgage Pass-Through Certificates, Series 2001-BC4, Class A1, Class A2, Class A-I0, Class M1, Class M2, Class B, Class X, Class R and Class P (the "Certificates") will evidence, in the aggregate, the entire beneficial ownership interest in a trust fund (the "Trust Fund"). The primary a

Structured Asset Securities Corp Mor Pas Thr Cer Sr 2001-Bc4 – COMMITMENT/CERTIFICATES ISSUED UNDER MORTGAGE GUARANTY MASTER POLICIES (June 22nd, 2001)

NOTICE OF ASSIGNMENT OF CERTAIN COMMITMENT/CERTIFICATES ISSUED UNDER MORTGAGE GUARANTY MASTER POLICIES Mortgage Guaranty Insurance Corporation ("MGIC") previously issued four Mortgage Guaranty Commitment/Certificates, copies of which are attached hereto as Attachment A (the "Certificates") which included among the mortgage loans insured the loans identified by their certificate numbers in Attachment B to this Notice of Assignment (the "Loans"). The Certificates evidence MGIC's agreement to insure the Loans under either Mortgage Guaranty Master Policy No. 05-020-4-1347 or 05-020-4-1269 and related Endorsements thereto (collectively, the "Aurora Policies") issued to Aurora Loan Services, Incorporated, as Master Servicer for Lehman Brothers (the "Original Insured"). Pursuant to Section 1.13 of the Aurora Policies, the Original Insured hereby acknowledges that all of the Original Insured's rights and interests under the Certificates for insurance of the L