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
Benchmark 2018-B8 Mortgage Trust (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, CWCapital Asset Management LLC, 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
Aventura Mall Mortgage Loan, CWCapital Asset Management LLC, as Special
Servicer for the Aventura Mall Mortgage Loan, Wilmington Trust, National
Association, as Trustee for the Aventura Mall Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the Aventura Mall Mortgage Loan, Park
Bridge Lender Services LLC, as Operating Advisor for the Aventura Mall Mortgage
Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for the
Aventura Mall Mortgage Loan, Computershare Trust Company, National Association,
as Servicing Function Participant for the Custodian for the Aventura Mall
Mortgage Loan, Wells Fargo Bank, National Association, as Primary Servicer for
the 636 11th Avenue Mortgage Loan, CWCapital Asset Management LLC, as Special
Servicer for the 636 11th Avenue Mortgage Loan, Wilmington Trust, National
Association, as Trustee for the 636 11th Avenue Mortgage Loan, Wells Fargo
Bank, National Association, as Custodian for the 636 11th Avenue Mortgage Loan,
Park Bridge Lender Services LLC, as Operating Advisor for the 636 11th Avenue
Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for
the 636 11th Avenue Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the 636
11th Avenue Mortgage Loan, Wells Fargo Bank, National Association, as Primary
Servicer for the Sheraton Music City Mortgage Loan, CWCapital Asset Management
LLC, as Special Servicer for the Sheraton Music City Mortgage Loan, Wilmington
Trust, National Association, as Trustee for the Sheraton Music City Mortgage
Loan, Wells Fargo Bank, National Association, as Custodian for the Sheraton
Music City Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor
for the Sheraton Music City Mortgage Loan, CoreLogic Solutions, LLC, as
Servicing Function Participant for the Sheraton Music City Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Sheraton Music City Mortgage Loan,
KeyBank National Association, as Primary Servicer for the Workspace Mortgage
Loan, KeyBank National Association, as Special Servicer for the Workspace
Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the
Workspace Mortgage Loan, Wells Fargo Bank, National Association, as Custodian
for the Workspace Mortgage Loan, Park Bridge Lender Services LLC, as Operating
Advisor for the Workspace Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the
Workspace Mortgage Loan, KeyBank National Association, as Primary Servicer for
the Moffett Towers II - Building 1 Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Special Servicer for the Moffett
Towers II - Building 1 Mortgage Loan prior to May 10, 2023, K-Star Asset
Management LLC, as Special Servicer for the Moffett Towers II - Building 1
Mortgage Loan on and after May 10, 2023, Wilmington Trust, National
Association, as Trustee for the Moffett Towers II - Building 1 Mortgage Loan,
Citibank, N.A., as Custodian for the Moffett Towers II - Building 1 Mortgage
Loan, Park Bridge Lender Services LLC, as Operating Advisor for the Moffett
Towers II - Building 1 Mortgage Loan, U.S. Bank National Association, as
Servicing Function Participant for the Moffett Towers II - Building 1 Mortgage
Loan, Wells Fargo Bank, National Association, as Primary Servicer for the
TripAdvisor HQ Mortgage Loan, Rialto Capital Advisors, LLC, as Special Servicer
for the TripAdvisor HQ Mortgage Loan, Wilmington Trust, National Association,
as Trustee for the TripAdvisor HQ Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the TripAdvisor HQ Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the TripAdvisor HQ Mortgage Loan,
CoreLogic Solutions, LLC, as Servicing Function Participant for the TripAdvisor
HQ Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the TripAdvisor HQ
Mortgage Loan, Wells Fargo Bank, National Association, as Primary Servicer for
the Moffett Towers - Buildings E, F, G Mortgage Loan, Rialto Capital Advisors,
LLC, as Special Servicer for the Moffett Towers - Buildings E, F, G Mortgage
Loan, Wilmington Trust, National Association, as Trustee for the Moffett Towers
- Buildings E, F, G Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Moffett Towers - Buildings E, F, G Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Moffett Towers - Buildings E,
F, G Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant
for the Moffett Towers - Buildings E, F, G Mortgage Loan, Computershare Trust
Company, National Association, as Servicing Function Participant for the
Custodian for the Moffett Towers - Buildings E, F, G Mortgage Loan, KeyBank
National Association, as Primary Servicer for the DUMBO Heights Portfolio
Mortgage Loan, LNR Partners, LLC, as Special Servicer for the DUMBO Heights
Portfolio Mortgage Loan prior to November 9, 2023, Green Loan Services LLC, as
Special Servicer for the DUMBO Heights Portfolio Mortgage Loan on and after
November 9, 2023, Wells Fargo Bank, National Association, as Trustee for the
DUMBO Heights Portfolio Mortgage Loan, Wells Fargo Bank, National Association,
as Custodian for the DUMBO Heights Portfolio Mortgage Loan, Park Bridge Lender
Services LLC, as Operating Advisor for the DUMBO Heights Portfolio Mortgage
Loan, Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the DUMBO Heights Portfolio Mortgage Loan,
KeyBank National Association, as Primary Servicer for the Saint Louis Galleria
Mortgage Loan, LNR Partners, LLC, as Special Servicer for the Saint Louis
Galleria Mortgage Loan prior to February 16, 2023, Argentic Services Company
LP, as Special Servicer for the Saint Louis Galleria Mortgage Loan on and after
February 16, 2023, Wells Fargo Bank, National Association, as Trustee for the
Saint Louis Galleria Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Saint Louis Galleria Mortgage Loan, Pentalpha Surveillance
LLC, as Operating Advisor for the Saint Louis Galleria Mortgage Loan, and
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Saint Louis Galleria Mortgage Loan.







Dated: March 18, 2024





/s/
Kunal K. Singh

Kunal
K. Singh

President
and Chief Executive Officer

(senior
officer in charge of securitization of the depositor)