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

  Bear Stearns Commercial Mortgage Securities Inc., Commercial Mortgage
  Pass-Through Certificates, Series 2007-PWR15, issued
  pursuant to the Pooling and Servicing Agreement dated as of March 1, 2007
  (the "Pooling and Servicing Agreement"), among Bear Stearns Commercial
  Mortgage Securities Inc., as depositor, Prudential Asset Resources, Inc.,
  as a master servicer and as loan specific special servicer, Wells Fargo
  Bank, National Association, as a master servicer, as certificate
  administrator and as tax administrator, ARCap Servicing, Inc., as general
  special servicer, and LaSalle Bank National Association, as trustee.

  I, Adam Ansaldi, the senior officer in charge of securitization
  for the Depositor, hereby 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 Bear Stearns Commercial Mortgage Securities Trust
    2007-PWR15 (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 the
    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 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 Pooling  and Servicing Agreement
    or the applicable sub-servicing agreement or primary servicing
    agreement in all material respects; and

  5.All of the reports on assessment of compliance with servicing criteria
    for assetbacked 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:
    Centerline Servicing Inc. as Special Servicer, Nationwide Life
    Insurance Company as Primary Servicer, Principal Global Investors, LLC
    as Primary Servicer, Prudential Asset Resources, Inc. as Master
    Servicer, Prudential Asset Resources, Inc. as Special Servicer, Wells
    Fargo Bank, N.A. as Certificate Administrator and Wells Fargo Bank, N.A.
     as Master Servicer.

    Dated:   March 31, 2008


    /s/ Adam Ansaldi
    Adam Ansaldi

    Vice President
    (senior officer in charge of securitization of the depositor)