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|  New      York                                                                       |   |  Subsidiary REMIC      30-044778Master REMIC      30-044777913-3291626 |
|-------------------------------------------------------------------------------------------|--------|-----------------------------------------------------------------------------|
| (State      or other jurisdiction ofincorporation      or organization of issuing entity) |   | (I.R.S.      Employer Identification      No. of issuing entity)            |

|   | 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|---------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.1                       | Trust      Agreement, dated as of February 1, 2007, between Morgan Stanley Capital I      Inc., as depositor, and LaSalle Bank National Association, as trustee      (filed as part of the Registrant’s Current Report on Form 8-K filed on      March 14, 2007 (Commission File No. 333-130684-26) and is incorporated by      reference herein).                                                                                                                                                                                                                                                                                       |
| 4.2                       | Amendment      Number 1 to the Trust Agreement, dated and effective as of March 30, 2007,      between Morgan Stanley Capital I Inc., as depositor, and LaSalle Bank      National Association, as trustee (filed as part of the Registrant’s      Current Report on Form 8-K filed on April 2, 2007 (Commission File No.      333-130684-26) and is incorporated by reference    herein).                                                                                                                                                                                                                                               |
| 10.1                      | Mortgage      Loan Purchase Agreement, dated as of February 1, 2007, between Morgan      Stanley Capital I Inc., as purchaser, and Morgan Stanley Mortgage Capital      Inc., as seller (filed as part of the Registrant’s Current Report on Form      8-K filed on March 14, 2007 (Commission File No. 333-130684-26) and is      incorporated by reference herein).                                                                                                                                                                                                                                                                    |
| 10.2                      | Servicing      Agreement, dated as of February 1, 2007, between Morgan Stanley Mortgage      Capital I Inc., as owner, and GMAC Mortgage, LLC, as servicer (filed as      part of the Registrant’s Current Report on Form 8-K filed on March 14,      2007 (Commission File No. 333-130684-26) and is incorporated by reference      herein).                                                                                                                                                                                                                                                                                            |
| 10.3                      | Assignment      Assumption and Recognition Agreement, dated March 30, 2007, between GMAC      Mortgage, LLC, f/k/a GMAC Mortgage Corporation, as interim servicer, Saxon      Mortgage Services, Inc., as servicer, Morgan Stanley Mortgage Capital Inc.      and LaSalle Bank National Association, as trustee, and acknowledged by      Morgan Stanley Mortgage Loan Trust 2007-4SL, the trust, and Morgan Stanley      Capital I Inc., the depositor (filed as part of the Registrant’s Current      Report on Form 8-K filed on April 2, 2007 (Commission File No.      333-130684-26) and is incorporated by reference    herein).  |
| 31                        | Rule      13a-14(d)/15d-14(d) Certification.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 33(a)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, GMAC Mortgage, LLC, as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 33(b)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, LaSalle Bank National Association, as Trustee and      Custodian.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 33(c)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, Saxon Mortgage Services, Inc., as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| 33(d)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, FIS Tax Services, as servicing function participant to      Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 33(e)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, First American Real Estate Solutions of Texas, LP, as      servicing function participant to Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 34(a)                     | Attestation      report on assessment of compliance with servicing criteria for      asset-backed securities, GMAC Mortgage, LLC, as  Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 34(b)                     | Attestation      report on assessment of compliance with servicing criteria for      asset-backed securities, LaSalle Bank National Association, as Trustee and      Custodian.                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 34(c)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, Saxon Mortgage Services, Inc. as      Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 34(d)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, FIS Tax Services, as servicing function participant to      Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 34(e)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, First American Real Estate Solutions of Texas, LP, as      servicing function participant to Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 35(a)                     | Servicer      compliance statement, GMAC Mortgage, LLC, as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 35(b)                     | Servicer      compliance statement, LaSalle Bank National Association, as      Trustee.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 35(c)                     | Servicer      compliance statement, Saxon Mortgage Services, Inc. as      Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |

| (b)       See (a) above. |   |
|-------------------------------|--------|

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|                           | Morgan      Stanley Capital I Inc.                                |
|--------------------------------|-------------------------------------------------------------------|
|                           |                                                              |
|  March 28,      2008 | /s/ Valerie      Kay                                         |
|                           | By:  Valerie      Kay                                   |
|                           | Title: Vice      President                                   |
|                           | Senior      Officer in Charge of Securitization of the  Depositor |

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| Exhibit      Number  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|---------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.1                       | Trust      Agreement, dated as of February 1, 2007, between Morgan Stanley Capital I      Inc., as depositor, and LaSalle Bank National Association, as trustee      (filed as part of the Registrant’s Current Report on Form 8-K filed on      March 14, 2007 (Commission File No. 333-130684-26) and is incorporated by      reference herein).                                                                                                                                                                                                                                                                                       |
| 4.2                       | Amendment      Number 1 to the Trust Agreement, dated and effective as of March 30, 2007,      between Morgan Stanley Capital I Inc., as depositor, and LaSalle Bank      National Association, as trustee (filed as part of the Registrant’s      Current Report on Form 8-K filed on April 2, 2007 (Commission File No.      333-130684-26) and is incorporated by reference    herein).                                                                                                                                                                                                                                               |
| 10.1                      | Mortgage      Loan Purchase Agreement, dated as of February 1, 2007, between Morgan      Stanley Capital I Inc., as purchaser, and Morgan Stanley Mortgage Capital      Inc., as seller (filed as part of the Registrant’s Current Report on Form      8-K filed on March 14, 2007 (Commission File No. 333-130684-26) and is      incorporated by reference herein).                                                                                                                                                                                                                                                                    |
| 10.2                      | Servicing      Agreement, dated as of February 1, 2007, between Morgan Stanley Mortgage      Capital I Inc., as owner, and GMAC Mortgage, LLC, as servicer (filed as      part of the Registrant’s Current Report on Form 8-K filed on March 14,      2007 (Commission File No. 333-130684-26) and is incorporated by reference      herein).                                                                                                                                                                                                                                                                                            |
| 10.3                      | Assignment      Assumption and Recognition Agreement, dated March 30, 2007, between GMAC      Mortgage, LLC, f/k/a GMAC Mortgage Corporation, as interim servicer, Saxon      Mortgage Services, Inc., as servicer, Morgan Stanley Mortgage Capital Inc.      and LaSalle Bank National Association, as trustee, and acknowledged by      Morgan Stanley Mortgage Loan Trust 2007-4SL, the trust, and Morgan Stanley      Capital I Inc., the depositor (filed as part of the Registrant’s Current      Report on Form 8-K filed on April 2, 2007 (Commission File No.      333-130684-26) and is incorporated by reference    herein).  |
| 31                        | Rule      13a-14(d)/15d-14(d) Certification.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 33(a)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, GMAC Mortgage, LLC, as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 33(b)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, LaSalle Bank National Association, as Trustee and      Custodian.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 33(c)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, Saxon Mortgage Services, Inc., as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| 33(d)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, FIS Tax Services, as servicing function participant to      Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 33(e)                     | Report      on assessment of compliance with servicing criteria for asset-backed      securities, First American Real Estate Solutions of Texas, LP, as      servicing function participant to Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 34(a)                     | Attestation      report on assessment of compliance with servicing criteria for      asset-backed securities, GMAC Mortgage, LLC, as  Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 34(b)                     | Attestation      report on assessment of compliance with servicing criteria for      asset-backed securities, LaSalle Bank National Association, as Trustee and      Custodian.                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 34(c)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, Saxon Mortgage Services, Inc. as      Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 34(d)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, FIS Tax Services, as servicing function participant to      Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 34(e)                     | Attestation report      on assessment of compliance with servicing criteria for asset-backed      securities, First American Real Estate Solutions of Texas, LP, as      servicing function participant to Saxon.                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 35(a)                     | Servicer      compliance statement, GMAC Mortgage, LLC, as Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 35(b)                     | Servicer      compliance statement, LaSalle Bank National Association, as      Trustee.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 35(c)                     | Servicer      compliance statement, Saxon Mortgage Services, Inc. as      Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |

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