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

Re: Morgan Stanley Bank of America Merrill Lynch Trust 2015-C21, CommercialMortgage Pass-Through Certificates, Series 2015-C21 (the“Transaction”), issued pursuant to the Pooling and ServicingAgreement dated as of February 1, 2015 (the “Pooling and ServicingAgreement”), executed in connection with the Transaction (capitalizedterms used but not defined herein have the meanings set forth in the Poolingand Servicing Agreement).I, George Kok, 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 Morgan Stanley Bank of America  Merrill Lynch Trust 2015-C21 (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 statement(s) required in this report under Item 1123  of Regulation AB, and except as disclosed in the Exchange Act periodic  reports, the servicer(s) have fulfilled their obligations under the servicing  agreement(s) 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 giving the certificationsabove, I have reasonably relied on information provided to me by the followingunaffiliated parties:

 

• Wells Fargo Bank,National Association, as Trustee• Wells Fargo Bank, National Association, as Certificate Administrator• Wells Fargo Bank, National Association, as Custodian• KeyBank National Association, as Master Servicer• LNR Partners, LLC, as Special Servicer• Situs Holdings, LLC, as Operating Advisor• Berkadia Commercial Mortgage LLC, as Primary Servicer• CWCapital Asset Management LLC, as Excluded Special Servicer• Trimont Real Estate Advisors, Inc., as Sub-Servicer• NorthMarq Capital Inc., as Servicing Function Participant• Midland Loan Services, a Division of PNC Bank, National Association, asMaster Servicer under the MSBAM 2015-C20 securitization, pursuant to which thefollowing mortgage loans were serviced: Discovery Business Center (from 1/1/16to 12/31/16)• CWCapital Asset Management LLC, as Special Servicer under the MSBAM2015-C20 securitization, pursuant to which the following mortgage loans wereserviced: Discovery Business Center (from 1/1/16 to 12/31/16)• Wells Fargo Bank, National Association, as Custodian under the MSBAM2015-C20 securitization, pursuant to which the following mortgage loans wereserviced: Discovery Business Center (from 1/1/16 to 12/31/16)

 

 

Date: March 30, 2017By: /s/ George KokName: George KokTitle: President