Rule13a-14(d)/15d-14(d) Certifications.

 

I,Helaine M. Kaplan, certify that:

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| 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 2014-CCRE21 Mortgage  Trust (the "Exchange Act periodic reports");                                                                                                                                                                                                                                                                                                                               |
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| 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;                                                                                                                                                                                                                           |
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| 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;                                                                                                                                                                                                                                                                                                                                                               |
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| 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                                                                                                                                                                                                                                                                             |
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| 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. |
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In givingthe certifications above, I have reasonably relied on information provided tome by the following unaffiliated parties:Midland Loan Services, a Division of PNC Bank, National Association, as MasterServicer, LNR Partners, LLC, as Special Servicer, Wells Fargo Bank, NationalAssociation, as Trustee and Certificate Administrator, Wells Fargo Bank,National Association, as Custodian, Park Bridge Lender Services LLC, asOperating Advisor, KeyBank National Association, as Primary Servicer, WellsFargo Bank, National Association, as Primary Servicer for the Loews Miami BeachHotel Mortgage Loan, Rialto Capital Advisors, LLC, as Special Servicer for theLoews Miami Beach Hotel Mortgage Loan prior to November 1, 2016, TorchlightLoan Services, LLC, as Special Servicer for the Loews Miami Beach HotelMortgage Loan on and after November 1, 2016, Wilmington Trust, NationalAssociation, as Trustee for the Loews Miami Beach Hotel Mortgage Loan, WellsFargo Bank, National Association, as Certificate Administrator for the LoewsMiami Beach Hotel Mortgage Loan, Wells Fargo Bank, National Association, asCustodian for the Loews Miami Beach Hotel Mortgage Loan, Situs Holdings, LLC,as Operating Advisor for the Loews Miami Beach Hotel Mortgage Loan, CoreLogicCommercial Real Estate Services, Inc., as Servicing Function Participant forthe Loews Miami Beach Hotel Mortgage Loan, and National Tax Search, LLC, asServicing Function Participant for the Loews Miami Beach Hotel Mortgage Loan.

 

Dated: March 22, 2017

 

/s/Helaine M. Kaplan

President

(senior officer in charge ofsecuritization of the depositor)