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, Wells Fargo Bank, National Association,
as Primary Servicer for the 245 Park Avenue Mortgage Loan, AEGON USA Realty
Advisors, 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 Certificate
Administrator 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, CoreLogic Commercial Real Estate Services, Inc., as Servicing Function
Participant for the 245 Park Avenue Mortgage Loan, National Tax Search, LLC, as
Servicing Function Participant 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 Certificate Administrator 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 Commercial Real Estate Services, Inc., as Servicing Function
Participant for the EIP Logistics Portfolio Mortgage Loan, National Tax Search,
LLC, as Servicing Function Participant for the EIP Logistics 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 and Certificate Administrator 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, 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 and
Certificate Administrator 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, Wells Fargo Bank, National Association, as Primary Servicer for
the General Motors Building Mortgage Loan, AEGON USA Realty Advisors, LLC, as
Special Servicer for the General Motors Building Mortgage Loan, Wilmington
Trust, National Association, as Trustee for the General Motors Building
Mortgage Loan, Wells Fargo Bank, National Association, as Certificate
Administrator for the General Motors Building Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the General Motors Building Mortgage
Loan, CoreLogic Commercial Real Estate Services, Inc., as Servicing Function
Participant for the General Motors Building Mortgage Loan, National Tax Search,
LLC, as Servicing Function Participant 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 Certificate
Administrator 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 Commercial Real Estate
Services, Inc., as Servicing Function Participant for the Treeview Industrial
Portfolio Mortgage Loan, National Tax Search, LLC, as Servicing Function
Participant for the Treeview Industrial Portfolio 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 Certificate Administrator 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 Commercial Real Estate
Services, Inc., as Servicing Function Participant for the First Stamford Place
Mortgage Loan, National Tax Search, LLC, as Servicing Function Participant for
the First Stamford Place 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 Certificate Administrator 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 Commercial Real
Estate Services, Inc., as Servicing Function Participant for the Torre Plaza
Mortgage Loan, National Tax Search, LLC, as Servicing Function Participant for
the Torre Plaza Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Lightstone Portfolio Mortgage Loan, LNR Partners, LLC,
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 Certificate Administrator 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 Commercial Real Estate Services, Inc., as Servicing Function
Participant for the Lightstone Portfolio Mortgage Loan, and National Tax
Search, LLC, as Servicing Function Participant for the Lightstone Portfolio
Mortgage Loan.







Dated: March 22, 2018





/s/ Kunal K. Singh





President and Chief
Executive Officer

(senior officer
in charge of securitization of the depositor)