EX-31 Rule 13a-14(d)/15d-14(d) Certification.


  I, Gerald Pietroforte, certify that:

  1.I have reviewed this report on Form 10-K and all reports on Form 10-D
    required to be filed in respect of the period covered by this report on
    Form 10-K of Lehman Mortgage Trust 2008-4 (the "Exchange Act periodic
    reports");

  2.Based on my knowledge, the Exchange Act periodic reports, taken as a
    whole, do not contain any untrue statement of a material fact or omit
    to state a material fact necessary to make the statements made, in
    light of the circumstances under which such statements were made, not
    misleading with respect to the period covered by this report;

  3.Based on my knowledge, all of the distribution, servicing and other
    information required to be provided under Form 10-D for the period
    covered by this report is included in the Exchange Act periodic reports;

  4.Based on my knowledge and the servicer compliance statements required
    in this report under Item 1123 of Regulation AB, and except as
    disclosed in the Exchange Act periodic reports, the servicers have
    fulfilled their obligations under the servicing agreements in all
    material respects; and

  5.All of the reports on assessment of compliance with servicing criteria
    for asset-backed securities and their related attestation reports on
    assessment of compliance with servicing criteria for asset-backed
    securities required to be included in this report in accordance with
    Item 1122 of Regulation AB and Exchange Act Rules 13a-18 and 15d-18
    have been included as an exhibit to this report, except as otherwise
    disclosed in this report.  Any material instances of noncompliance
    described in such reports have been disclosed in this report on Form
    10-K.

    In giving the certifications above, I have reasonably relied on
    information provided to me by the following unaffiliated parties: Bank
    of America, National Association, as successor by merger to LaSalle
    Bank National Association, as Custodian for Lehman Mortgage Trust,
    Series 2006-9, Countrywide Home Loans Servicing LP as Servicer for
    Lehman Mortgage Trust, Series 2006-9, Deutsche Bank National Trust
    Company as Custodian for Lehman Mortgage Trust, Series 2006-9, IndyMac
    Federal Bank, FSB f/k/a IndyMac Bank, F.S.B. as Servicer for Lehman
    Mortgage Trust, Series 2006-9, Newport Management Corporation as
    Sub-Contractor for Aurora Loan Services LLC, Newport Management
    Corporation as Sub-Contractor for IndyMac Federal Bank, F.S.B. f/k/a
    IndyMac Bank, F.S.B., U.S. Bank National Association as Custodian for
    Lehman Mortgage Trust, Series 2006-9, Wells Fargo Bank, N.A. as Trustee,
     Wells Fargo Bank, N.A. as Trustee for Lehman Mortgage Trust, Series
    2006-9, Wells Fargo Bank, N.A. as Paying Agent, Wells Fargo Bank, N.A.
    as Paying Agent for Lehman Mortgage Trust, Series 2006-9 and Westlake
    Settlement Services, LLC as Sub-Contractor for Aurora Loan Services LLC.

    Dated:   April 9, 2009


    By: /s/ Gerald Pietroforte
    Name: Gerald Pietroforte
    Title: Vice President
    (senior officer in charge of securitization of the depositor)