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|   | Delaware                                                                |   | 74-2440850                                     |   |
|--------|-------------------------------------------------------------------------|--------|------------------------------------------------|--------|
|   | (State      or other jurisdiction ofincorporation      or organization) |   | (I.R.S.      Employer Identification      No.) |   |

|   | o      Yes |   | x No |
|--------|------------|--------|-----------|

|   | o      Yes |   | x      No |
|--------|------------|--------|-----------|

|   | x      Yes |   | o      No |
|--------|------------|--------|-----------|

| Large      accelerated filer       |  o | Accelerated      filer                   |   o                              |
|----------------------------------------------|---------|----------------------------------------------------|--------------------------------------------|
| Non-accelerated      filer    |  x | (Do      not check if a smaller reporting company) | Smaller      reporting company   |   o |

| Exhibit      Number | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4                   | Trust      Agreement dated as of January 1, 2007, among Structured Asset Securities      Corporation, as Depositor, Aurora Loan Services LLC, as Master Servicer,      and LaSalle Bank National Association, as Trustee (incorporated herein by      reference from Exhibit 4.1 of the Current Report on Form 8-K of the      registrant, as filed with the Commission on February 14, 2007,      Commission File Number 333-82904-20, CIK number    0001387150). |
| 10                  | Incorporated      by reference as Exhibit (4).                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 31                  | Rule      13a-14(d) / 15d-14(d) Certifications.                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 33                  | Reports      on assessment of compliance with servicing criteria for asset-backed      securities                                                                                                                                                                                                                                                                                                                                                                       |
| (a)                 | Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                                                       |
| (b)                 |     LaSalle      Bank National Association, as Trustee and Paying Agent                                                                                                                                                                                                                                                                                                                                                                             |
| (c)                 |     LaSalle      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                            |
| (d)                 |     Deutsche Bank      National Trust Company, as Custodian                                                                                                                                                                                                                                                                                                                                                                                         |
| (e)                 |     U.S.      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                               |
| (f)                 |     Wells      Fargo Bank, N. A., as Custodian                                                                                                                                                                                                                                                                                                                                                                                                      |
| (g)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (h)                 |     Wells      Fargo Bank, N. A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                       |
| (i)                 |     Aurora      Loan Services LLC, as Servicer                                                                                                                                                                                                                                                                                                                                                                                                      |
| (j)                 |     Newport      Management Corporation, as Sub-Contractor for IndyMac,    F.S.B.                                                                                                                                                                                                                                                                                                                                                                   |
| (k)                 |     Westlake      Settlement Services, LLC, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                     |
| (l)                 | Newport Management Corporation, as Sub-Contractor for Aurora Loan      Services LLC                                                                                                                                                                                                                                                                                                                                                                                     |
| 34                  | Attestation      reports on assessment of compliance with servicing criteria for      asset-backed securities                                                                                                                                                                                                                                                                                                                                                           |
| (a)                 |     Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                               |
| (b)                 |     LaSalle      Bank National Association, as Trustee and Paying Agent                                                                                                                                                                                                                                                                                                                                                                             |
| (c)                 |     LaSalle      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                            |
| (d)                 |     Deutsche Bank      National Trust Company, as Custodian                                                                                                                                                                                                                                                                                                                                                                                         |
| (e)                 |     U.S.      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                               |
| (f)                 |     Wells      Fargo Bank, N. A., as Custodian                                                                                                                                                                                                                                                                                                                                                                                                      |
| (g)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (h)                 |     Wells      Fargo Bank, N. A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                       |
| (i)                 |     Aurora      Loan Services LLC, as Servicer                                                                                                                                                                                                                                                                                                                                                                                                      |
| (j)                 |     Newport      Management Corporation, as Sub-Contractor for IndyMac,    F.S.B.                                                                                                                                                                                                                                                                                                                                                                   |
| (k)                 |     Westlake      Settlement Services, LLC, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                     |
| (l)                 | Newport      Management Corporation, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                                                |
| 35                  | Servicer      compliance statement                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| (a)                 |     Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                               |
| (b)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (c)                 |     Wells      Fargo Bank, N.A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                        |
| (d)                 |     Aurora      Loan Services LLC, asServicer                                                                                                                                                                                                                                                                                                                                                                                                       |

| (b)      Exhibits identified in paragraph (a)above. |
|-----------------------------------------------------|

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|                 | Lehman XS Trust 2007-1                                                                                                              |
|----------------------|-------------------------------------------------------------------------------------------------------------------------------------|
|                 |                                                                                                                                |
|                 |                                                                                                                                |
|  March 27, 2008 | By: /s/ E. Todd  Whittemore                                                                                                    |
|                 | Name:       E. Todd Whittemore                                                                                                 |
|                 | Title:       Executive Vice President                                                                                     |
|                 | (Senior      Officer in charge of the servicing function of Aurora Loan Services      LLC, in its capacity as master servicer) |
|                 | Aurora      Loan Services LLC, as MasterServicer                                                                               |

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| Exhibit      Number | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4                   | Trust      Agreement dated as of January 1, 2007, among Structured Asset Securities      Corporation, as Depositor, Aurora Loan Services LLC, as Master Servicer,      and LaSalle Bank National Association, as Trustee (incorporated herein by      reference from Exhibit 4.1 of the Current Report on Form 8-K of the      registrant, as filed with the Commission on February 14, 2007,      Commission File Number 333-82904-20, CIK number    0001387150). |
| 10                  | Incorporated      by reference as Exhibit (4).                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 31                  | Rule      13a-14(d) / 15d-14(d) Certifications.                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 33                  | Reports      on assessment of compliance with servicing criteria for asset-backed      securities                                                                                                                                                                                                                                                                                                                                                                       |
| (a)                 | Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                                                       |
| (b)                 |     LaSalle      Bank National Association, as Trustee and Paying Agent                                                                                                                                                                                                                                                                                                                                                                             |
| (c)                 |     LaSalle      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                            |
| (d)                 |     Deutsche Bank      National Trust Company, as Custodian                                                                                                                                                                                                                                                                                                                                                                                         |
| (e)                 |     U.S.      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                               |
| (f)                 |     Wells      Fargo Bank, N. A., as Custodian                                                                                                                                                                                                                                                                                                                                                                                                      |
| (g)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (h)                 |     Wells      Fargo Bank, N. A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                       |
| (i)                 |     Aurora      Loan Services LLC, as Servicer                                                                                                                                                                                                                                                                                                                                                                                                      |
| (j)                 |     Newport      Management Corporation, as Sub-Contractor for IndyMac,    F.S.B.                                                                                                                                                                                                                                                                                                                                                                   |
| (k)                 |     Westlake      Settlement Services, LLC, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                     |
| (l)                 | Newport Management Corporation, as Sub-Contractor for Aurora Loan      Services LLC                                                                                                                                                                                                                                                                                                                                                                                     |
| 34                  | Attestation      reports on assessment of compliance with servicing criteria for      asset-backed securities                                                                                                                                                                                                                                                                                                                                                           |
| (a)                 |     Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                               |
| (b)                 |     LaSalle      Bank National Association, as Trustee and Paying Agent                                                                                                                                                                                                                                                                                                                                                                             |
| (c)                 |     LaSalle      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                            |
| (d)                 |     Deutsche Bank      National Trust Company, as Custodian                                                                                                                                                                                                                                                                                                                                                                                         |
| (e)                 |     U.S.      Bank National Association, as Custodian                                                                                                                                                                                                                                                                                                                                                                                               |
| (f)                 |     Wells      Fargo Bank, N. A., as Custodian                                                                                                                                                                                                                                                                                                                                                                                                      |
| (g)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (h)                 |     Wells      Fargo Bank, N. A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                       |
| (i)                 |     Aurora      Loan Services LLC, as Servicer                                                                                                                                                                                                                                                                                                                                                                                                      |
| (j)                 |     Newport      Management Corporation, as Sub-Contractor for IndyMac,    F.S.B.                                                                                                                                                                                                                                                                                                                                                                   |
| (k)                 |     Westlake      Settlement Services, LLC, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                     |
| (l)                 | Newport      Management Corporation, as Sub-Contractor for Aurora Loan Services      LLC                                                                                                                                                                                                                                                                                                                                                                                |
| 35                  | Servicer      compliance statement                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| (a)                 |     Aurora      Loan Services LLC, as Master Servicer                                                                                                                                                                                                                                                                                                                                                                                               |
| (b)                 |     IndyMac      F.S.B. as Servicer                                                                                                                                                                                                                                                                                                                                                                                                                 |
| (c)                 |     Wells      Fargo Bank, N.A., as Servicer                                                                                                                                                                                                                                                                                                                                                                                                        |
| (d)                 |     Aurora      Loan Services LLC, asServicer                                                                                                                                                                                                                                                                                                                                                                                                       |

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