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

  I, Brian Baker, 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 the JPMBB Commercial Mortgage Securities Trust 2013-C12 (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:

  Midland Loan Services, A Division of PNC Bank, National Association, as Master
  Servicer, LNR Partners, LLC, as Special Servicer, Wells Fargo Bank, National
  Association, as Trustee and Certificate Administrator, Wells Fargo Bank,
  National Association, as Custodian, Pentalpha Surveillance, LLC, as Senior
  Trust Advisor, KeyBank National Association (as successor to KeyCorp Real
  Estate Capital Markets, Inc.), as Primary Servicer, Midland Loan Services, A
  Division of PNC Bank, National Association, as Primary Servicer for the IDS
  Center Mortgage Loan, Berkadia Commercial Mortgage LLC, as Special Servicer
  for the IDS Center Mortgage Loan prior to September 6, 2013, KeyBank National
  Association (as successor to KeyCorp Real Estate Capital Markets, Inc.), as
  Sub-Special Servicer for the IDS Center Mortgage Loan from August 1, 2013 to
  and including September 5, 2013, KeyBank National Association (as successor to
  KeyCorp Real Estate Capital Markets, Inc.), as Special Servicer for the IDS
  Center Mortgage Loan on and after September 6, 2013, Wells Fargo Bank,
  National Association, as Trustee and Certificate Administrator for the IDS
  Center Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for
  the IDS Center Mortgage Loan, Pentalpha Surveillance, LLC, as Senior Trust
  Advisor for the IDS Center Mortgage Loan, Midland Loan Services, A Division of
  PNC Bank, National Association, as Primary Servicer for the Southridge Mall
  Mortgage Loan, Midland Loan Services, A Division of PNC Bank, National
  Association, as Special Servicer for the Southridge Mall Mortgage Loan, Wells
  Fargo Bank, National Association, as Trustee and Certificate Administrator for
  the Southridge Mall Mortgage Loan, Wells Fargo Bank, National Association, as
  Custodian for the Southridge Mall Mortgage Loan, and Pentalpha Surveillance,
  LLC, as Senior Trust Advisor for the Southridge Mall Mortgage Loan.


    Dated:   March 28, 2014


    /s/ Brian Baker
    Signature

    President and Chief Executive Officer
    (senior officer in charge of securitization of the depositor)