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

 

 

I,Lawrence Chun, certify that:

 

1. Ihave reviewed this report on Form 10-K and all reports on Form 10-D required tobe filed in respect of the period covered by this report on Form 10-K of theCSAIL 2021-C20 Commercial Mortgage Trust (the "Exchange Act periodicreports");

 

2.Based on my knowledge, the Exchange Act periodic reports, taken as a whole, donot contain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this report;

 

3.Based on my knowledge, all of the distribution, servicing and other informationrequired to be provided under Form 10-D for the period covered by this reportis included in the Exchange Act periodic reports;

 

4.Based on my knowledge and the servicer compliance statements required in thisreport under Item 1123 of Regulation AB, and except as disclosed in theExchange Act periodic reports, the servicers have fulfilled their obligationsunder the servicing agreements in all material respects; and

 

5. Allof the reports on assessment of compliance with servicing criteria forasset-backed securities and their related attestation reports on assessment ofcompliance with servicing criteria for asset-backed securities required to beincluded in this report in accordance with Item 1122 of Regulation AB andExchange Act Rules 13a-18 and 15d-18 have been included as an exhibit tothis report, except as otherwise disclosed in this report.Any material instances of noncompliance described in such reports have beendisclosed in this report on Form 10-K.

 

Ingiving the certifications above, I have reasonably relied on informationprovided to me by the following unaffiliated parties:

 

 Midland Loan Services, a Division of PNC Bank, NationalAssociation, as Master Servicer, 3650 REIT Loan Servicing LLC, as SpecialServicer, Wells Fargo Bank, National Association, as Trustee and CertificateAdministrator, Wells Fargo Bank, National Association, as Custodian, ParkBridge Lender Services LLC, as Operating Advisor, Computershare Trust Company,National Association, as Servicing Function Participant for the CertificateAdministrator, Computershare Trust Company, National Association, as ServicingFunction Participant for the Custodian, Principal Real Estate Investors, LLC,as Primary Servicer for the 888 Figueroa Mortgage Loan, LNR Partners, LLC, asSpecial Servicer for the 888 Figueroa Mortgage Loan, Wells Fargo Bank, NationalAssociation, as Trustee for the 888 Figueroa Mortgage Loan, Wells Fargo Bank,National Association, as Custodian for the 888 Figueroa Mortgage Loan, ParkBridge Lender Services LLC, as Operating Advisor for the 888 Figueroa MortgageLoan, Computershare Trust Company, National Association, as Servicing FunctionParticipant for the Custodian for the 888 Figueroa Mortgage Loan, Midland LoanServices, a Division of PNC Bank, National Association, as Primary Servicer forThe Westchester Mortgage Loan, Midland Loan Services, aDivision of PNC Bank, National Association, as Special Servicer for TheWestchester Mortgage Loan, Wells Fargo Bank, National Association, asTrustee for The Westchester Mortgage Loan, Wells Fargo Bank, NationalAssociation, as Custodian for The Westchester Mortgage Loan, and PentalphaSurveillance LLC, as Operating Advisor for The Westchester Mortgage Loan,Computershare Trust Company, National Association, as Servicing FunctionParticipant for the Custodian for The Westchester Mortgage Loan, KeyBankNational Association, as Primary Servicer for the MGM Grand & Mandalay BayMortgage Loan, Situs Holdings, LLC, as Special Servicer for the MGM Grand &Mandalay Bay Mortgage Loan, Wilmington Trust, National Association, as Trusteefor the MGM Grand & Mandalay Bay Mortgage Loan, Citibank, N.A., asCustodian for the MGM Grand & Mandalay Bay Mortgage Loan, U.S. BankNational Association, as Servicing Function Participant for the MGM Grand &Mandalay Bay Mortgage Loan, Wells Fargo Bank, National Association, as PrimaryServicer for The Grace Building Mortgage Loan, Situs Holdings, LLC, as SpecialServicer for The Grace Building Mortgage Loan, Wilmington Trust, NationalAssociation, as Trustee for The Grace Building Mortgage Loan, Wells Fargo Bank,National Association, as Custodian for The Grace Building Mortgage Loan, ParkBridge Lender Services LLC, as Operating Advisor for The Grace BuildingMortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant forThe Grace Building Mortgage Loan, Computershare Trust Company, NationalAssociation, as Servicing Function Participant for the Custodian for The GraceBuilding Mortgage Loan, Wells Fargo Bank, National Association, as PrimaryServicer for the Miami Design District Mortgage Loan, Rialto Capital Advisors,LLC, as Special Servicer for the Miami Design District Mortgage Loan,Wilmington Trust, National Association, as Trustee for the Miami DesignDistrict Mortgage Loan, Wells Fargo Bank, National Association, as Custodianfor the Miami Design District Mortgage Loan, Park Bridge Lender Services LLC,as Operating Advisor for the Miami Design District Mortgage Loan, CoreLogicSolutions, LLC, as Servicing Function Participant for the Miami Design DistrictMortgage Loan, andComputershare TrustCompany, National Association, as Servicing Function Participant for theCustodian for the Miami Design District Mortgage Loan.

 

 

 

Dated: March 15, 2024

 

 

/s/Lawrence Chun

LawrenceChun

AuthorizedSignatory

(seniorofficer in charge of securitization of the depositor)