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





I, Kunal K. Singh, 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 JPMDB Commercial Mortgage Securities Trust 2017-C7 (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:



Midland Loan Services, a Division of PNC Bank, National
Association, as Master Servicer, Midland Loan Services, a Division of PNC Bank,
National Association, as Special Servicer, Wells Fargo Bank, National
Association, as Trustee and Certificate Administrator, Wells Fargo Bank,
National Association, as Custodian, Pentalpha Surveillance LLC, as Operating
Advisor, Computershare Trust Company, National Association, as Servicing
Function Participant for the Certificate Administrator, Computershare Trust
Company, National Association, as Servicing Function Participant for the
Custodian, Wells Fargo Bank, National Association, as Primary Servicer for the
245 Park Avenue Mortgage Loan, Situs Holdings, LLC, as Special Servicer for the
245 Park Avenue Mortgage Loan, Wilmington Trust, National Association, as
Trustee for the 245 Park Avenue Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the 245 Park Avenue Mortgage Loan, Trimont Real
Estate Advisors, LLC, as Operating Advisor for the 245 Park Avenue Mortgage
Loan prior to December 14, 2022, BellOak, LLC, as Operating Advisor for the 245
Park Avenue Mortgage Loan on and after December 14, 2022, CoreLogic Solutions,
LLC, as Servicing Function Participant for the 245 Park Avenue Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the 245 Park Avenue Mortgage Loan, Wells
Fargo Bank, National Association, as Primary Servicer for the EIP Logistics
Portfolio Mortgage Loan, Rialto Capital Advisors, LLC, as Special Servicer for
the EIP Logistics Portfolio Mortgage Loan, Wilmington Trust, National
Association, as Trustee for the EIP Logistics Portfolio Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the EIP Logistics Portfolio
Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for the
EIP Logistics Portfolio Mortgage Loan, CoreLogic Solutions, LLC, as Servicing
Function Participant for the EIP Logistics Portfolio Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the EIP Logistics Portfolio Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Starwood Capital Group Hotel Portfolio Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Special
Servicer for the Starwood Capital Group Hotel Portfolio Mortgage Loan, Wells
Fargo Bank, National Association, as Trustee for the Starwood Capital Group
Hotel Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Starwood Capital Group Hotel Portfolio Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the Starwood Capital Group
Hotel Portfolio Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the
Starwood Capital Group Hotel Portfolio Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Primary Servicer for the Gateway
Net Lease Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC
Bank, National Association, as Special Servicer for the Gateway Net Lease
Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for
the Gateway Net Lease Portfolio Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Gateway Net Lease Portfolio Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the Gateway Net Lease
Portfolio Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Gateway Net Lease
Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Primary
Servicer for the General Motors Building Mortgage Loan, Argentic Services
Company LP, as Special Servicer for the General Motors Building Mortgage Loan
prior to July 15, 2022, Green Loan Services LLC, as Special Servicer for the
General Motors Building Mortgage Loan on and after July 15, 2022, Wilmington
Trust, National Association, as Trustee for the General Motors Building
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
General Motors Building Mortgage Loan, CoreLogic Solutions, LLC, as Servicing
Function Participant for the General Motors Building Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the General Motors Building Mortgage Loan,
Wells Fargo Bank, National Association, as Primary Servicer for the Treeview
Industrial Portfolio Mortgage Loan, CWCapital Asset Management LLC, as Special
Servicer for the Treeview Industrial Portfolio Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the Treeview Industrial Portfolio Mortgage
Loan, Wells Fargo Bank, National Association, as Custodian for the Treeview
Industrial Portfolio Mortgage Loan, Pentalpha Surveillance LLC, as Operating
Advisor for the Treeview Industrial Portfolio Mortgage Loan, CoreLogic
Solutions, LLC, as Servicing Function Participant for the Treeview Industrial
Portfolio Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Treeview Industrial
Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Primary
Servicer for the Torre Plaza Mortgage Loan, CWCapital Asset Management LLC, as
Special Servicer for the Torre Plaza Mortgage Loan, Wilmington Trust, National
Association, as Trustee for the Torre Plaza Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the Torre Plaza Mortgage Loan, Pentalpha
Surveillance LLC, as Operating Advisor for the Torre Plaza Mortgage Loan,
CoreLogic Solutions, LLC, as Servicing Function Participant for the Torre Plaza
Mortgage Loan, Computershare Trust Company, National Association, as Servicing
Function Participant for the Custodian for the Torre Plaza Mortgage Loan, Wells
Fargo Bank, National Association, as Primary Servicer for the First Stamford
Place Mortgage Loan, CWCapital Asset Management LLC, as Special Servicer for
the First Stamford Place Mortgage Loan, Wilmington Trust, National Association,
as Trustee for the First Stamford Place Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the First Stamford Place Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the First Stamford Place
Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for
the First Stamford Place Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the First
Stamford Place Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Lightstone Portfolio Mortgage Loan, Argentic Services
Company LP, as Special Servicer for the Lightstone Portfolio Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the Lightstone Portfolio
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
Lightstone Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as
Operating Advisor for the Lightstone Portfolio Mortgage Loan, CoreLogic
Solutions, LLC, as Servicing Function Participant for the Lightstone Portfolio
Mortgage Loan, and Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Lightstone Portfolio
Mortgage Loan.







Dated:
March 10, 2023





/s/ Kunal K. Singh

Kunal K. Singh

President and Chief Executive Officer

(senior
officer in charge of securitization of the depositor)