CERTIFICATION
 
 J.P.
Morgan Chase Commercial Mortgage Securities Trust 2007-LDP12
 Commercial
Mortgage Pass-Through Certificates
 Series
2007-LDP12 (the “Trust”)
 
 I, Brian
Baker, the President and Chief Executive
Officer of J.P. Morgan Chase Commercial Mortgage Securities Corp., the depositor
into the above-referenced Trust, certify that:
 
 1.           I
have reviewed this annual report on Form 10-K, and all reports on Form 10-D
required to be filed in respect of the period covered by this annual report on
Form 10-K, of the Trust (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 master servicer and the special servicer
have fulfilled their obligations under the Pooling and Servicing Agreement
in all material respects; and
 
 5.           All
of the reports on assessment of compliance with servicing criteria and their
related attestation reports on assessment of compliance with servicing
criteria 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:  Wells Fargo Bank, N.A. as
Master Servicer, J.E.
Robert Company, Inc. as Special Servicer, LaSalle Bank National Association as
Trustee, Midland Loan
Services, Inc. as sub-servicer for Wells Fargo Bank, N.A., Wachovia Bank,
National Association as Master Servicer for the Carespring Portfolio and Logan
Portfolio loans, Global Realty Outsourcing, Inc. as sub-servicer for Wachovia
Bank, National Association for the Carespring Portfolio and Logan Portfolio
loans, First American Commercial Real Estate Services, Inc. as sub-servicer for
Wachovia Bank, National Association for the Carespring Portfolio and Logan
Portfolio loans, CWCapital Asset Management LLC as Special Servicer for the
Carespring Portfolio and Logan Portfolio loans, and LaSalle Bank National
Association as Trustee for the Carespring Portfolio and Logan Portfolio
loans.
 
 
 Date:   March
27, 2008
 
 
 By: /s/ Brian
Baker
 President
and Chief Executive Officer
 J.P.
Morgan Chase Commercial Mortgage
Securities Corp.
 (senior
officer in charge of securitization of the depositor)