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

I, Helaine M. Kaplan, 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 COMM 2012-CCRE3 Mortgage 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 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:

Wells Fargo Bank, National Association, as Master Servicer, Midland Loan
Services, a Division of PNC Bank, National Association, as Special
Servicer, U.S. Bank National Association, as Trustee, Situs Holdings,
LLC, as Operating Advisor, CoreLogic Commercial Real Estate Services,
Inc., as Servicing Function Participant, National Tax Search, LLC, as
Servicing Function Participant, Wells Fargo Bank, National Association,
as Primary Servicer for the Crossgates Mall Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Special
Servicer for the Crossgates Mall Mortgage Loan, U.S. Bank National
Association, as Trustee for the Crossgates Mall Mortgage Loan, Wells
Fargo Bank, National Association, as Certificate Administrator for the
Crossgates Mall Mortgage Loan, Wells Fargo Bank, National Association
as Custodian for the Crossgates Mall Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Crossgates Mall
Mortgage Loan, CoreLogic Commercial Real Estate Services, Inc., as
Servicing Function Participant for the Crossgates Mall Mortgage Loan,
National Tax Search, LLC, as Servicing Function Participant for the
Crossgates Mall Mortgage Loan, Wells Fargo Bank, National Association,
as Primary Servicer for the Prince Building Mortgage Loan, Torchlight
Loan Services, LLC, as Special Servicer for the Prince Building Mortgage
Loan, U.S. Bank National Association, as Trustee for the Prince Building
Mortgage Loan, Wells Fargo Bank, National Association, as Certificate
Administrator for the Prince Building Mortgage Loan, Wells Fargo Bank,
National Association as Custodian for the Prince Building Mortgage Loan,
Park Bridge Lender Services LLC, as Operating Advisor for the Prince
Building Mortgage Loan, CoreLogic Commercial Real Estate Services, Inc.,
as Servicing Function Participant for the Prince Building Mortgage Loan,
and National Tax Search, LLC, as Servicing Function Participant for the
Prince Building Mortgage Loan.


Date:  March 27, 2014

/s/ Helaine M. Kaplan
Helaine M. Kaplan
President
(senior officer in charge of securitization of the depositor)