CERTIFICATION






J.P.
      Morgan Chase Commercial Mortgage Securities Corp.


Commercial
      Mortgage Pass-Through Certificates


Series
      2005-LDP3 (the “ Trust ”)




I,
      Steven
      Z. Schwartz, 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
              8-K
              containing distribution or servicing reports filed in respect of periods
              included in the year covered by this annual report, of the
              Trust;
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|2. | Based
              on my knowledge, the information in these reports, taken as a whole,
              does
              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
              as of
              the last day of the period covered by this annual
              report;
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|3. | Based
              on my knowledge, the distribution or servicing information required
              to be
              provided to the paying agent by the master servicer and the special
              servicer under the pooling and servicing agreement for inclusion in
              these
              reports is included in these reports;
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. | Based
              on my knowledge and upon the annual compliance statement included in
              this
              annual report and required to be delivered to the paying agent in
              accordance with the terms of the pooling and servicing agreement, and
              except as disclosed in this annual report, the master servicer and
              the
              special servicer have fulfilled their obligations under the pooling
              and
              servicing agreement; and
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | This
              annual report discloses all significant deficiencies relating to the
              master servicer’s or special servicer’s compliance with the minimum
              servicing standards based upon the report provided by an independent
              public accountant, after conducting a review in compliance with the
              Uniform Single Attestation Program for Mortgage Bankers or similar
              procedure, as set forth in the pooling and servicing agreement, that
              is
              included in this annual report.
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------






In
      giving
      the certifications above, I have reasonably relied on information provided
      to me
      by the following unaffiliated parties: LaSalle Bank National Association, GMAC
      Commercial Mortgage Corporation and CWCapital Asset Management LLC.





Date:  March
      20,
      2006




By: /s/
      Steven Z. Schwartz


President
      and Chief Executive Officer


J.P.
      Morgan Chase Commercial Mortgage


Securities
      Corp.