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





I, Helaine M. Kaplan, 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-B1 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:



Wells Fargo Bank, National Association, as Master Servicer, LNR
Partners, LLC, as Special Servicer, Wilmington Trust, National Association, as
Trustee, Wells Fargo Bank, National Association, as Certificate Administrator,
Wells Fargo Bank, National Association, as Custodian, Park Bridge Lender
Services LLC, as Operating Advisor, CoreLogic Solutions, LLC, as Servicing
Function Participant, 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, 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, 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 Station Place III Mortgage
Loan, Midland Loan Services, a Division of PNC Bank, National Association, as
Special Servicer for the Station Place III Mortgage Loan, Wells Fargo Bank,
National Association, as Trustee for the Station Place III Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the Station Place III
Mortgage Loan, Pentalpha Surveillance LLC, as Operating Advisor for the Station
Place III Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Station Place III
Mortgage Loan, Midland Loan Services, a Division of PNC Bank, National
Association, as Primary Servicer for the AHIP Northeast Portfolio I Mortgage
Loan, Midland Loan Services, a Division of PNC Bank, National Association, as
Special Servicer for the AHIP Northeast Portfolio I Mortgage Loan, Wells Fargo
Bank, National Association, as Trustee for the AHIP Northeast Portfolio I
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
AHIP Northeast Portfolio I Mortgage Loan, Pentalpha Surveillance LLC, as
Operating Advisor for the AHIP Northeast Portfolio I Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the AHIP Northeast Portfolio I Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the 521-523 East 72nd Street Mortgage Loan, Midland Loan Services,
a Division of PNC Bank, National Association, as Special Servicer for the
521-523 East 72nd Street Mortgage Loan, Wells Fargo Bank, National Association,
as Trustee for the 521-523 East 72nd Street Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the 521-523 East 72nd Street Mortgage
Loan, Pentalpha Surveillance LLC, as Operating Advisor for the 521-523 East
72nd Street Mortgage Loan, Computershare Trust Company, National Association,
as Servicing Function Participant for the Custodian for the 521-523 East 72nd
Street Mortgage Loan, Wells Fargo Bank, National Association, as Primary
Servicer for the Worldwide Plaza Mortgage Loan, Situs Holdings, LLC, successor
to Cohen Financial, a Division of Truist Bank, successor by merger to SunTrust
Bank, as Special Servicer for the Worldwide Plaza Mortgage Loan, Wilmington
Trust, National Association, as Trustee for the Worldwide Plaza Mortgage Loan,
Wells Fargo Bank, National Association, as Custodian for the Worldwide Plaza
Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for the
Worldwide Plaza Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function
Participant for the Worldwide Plaza Mortgage Loan, Computershare Trust Company,
National Association, as Servicing Function Participant for the Custodian for
the Worldwide Plaza Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Griffin Portfolio Mortgage Loan, LNR Partners, LLC, as
Special Servicer for the Griffin Portfolio Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the Griffin Portfolio Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the Griffin Portfolio
Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for the
Griffin Portfolio Mortgage Loan, CoreLogic Solutions, LLC, as Servicing
Function Participant for the Griffin Portfolio Mortgage Loan, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Griffin Portfolio Mortgage Loan, KeyBank National
Association, as Primary Servicer for the Miracle Mile Shopping Center Mortgage
Loan, CWCapital Asset Management LLC, as Special Servicer for the Miracle Mile
Shopping Center Mortgage Loan prior to June 24, 2022, LNR Partners, LLC, as Special
Servicer for the Miracle Mile Shopping Center Mortgage Loan on and after June
24, 2022, Wells Fargo Bank, National Association, as Trustee for the Miracle
Mile Shopping Center Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Miracle Mile Shopping Center Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Miracle Mile Shopping Center
Mortgage Loan, Computershare Trust Company, National Association, as Servicing
Function Participant for the Custodian for the Miracle Mile Shopping Center
Mortgage Loan, Wells Fargo Bank, National Association, as Primary Servicer for
The Woods Mortgage Loan, Argentic Services Company LP, as Special Servicer for
The Woods Mortgage Loan, Wilmington Trust, National Association, as Trustee for
The Woods Mortgage Loan, Wells Fargo Bank, National Association, as Custodian
for The Woods Mortgage Loan, Park Bridge Lender Services LLC, as Operating
Advisor for The Woods Mortgage Loan, CoreLogic Solutions, LLC, as Servicing
Function Participant for the Custodian for The Woods Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for The Woods Mortgage Loan, as Servicing
Function Participant for The Woods Mortgage Loan, KeyBank National Association,
as Primary Servicer for the Sentinel Square II Mortgage Loan, CWCapital Asset
Management LLC, as Special Servicer for the Sentinel Square II Mortgage Loan,
Wells Fargo Bank, National Association, as Trustee for the Sentinel Square II
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
Sentinel Square II Mortgage Loan, Pentalpha Surveillance LLC, as Operating
Advisor for the Sentinel Square II Mortgage Loan, Computershare Trust Company,
National Association, as Servicing Function Participant for the Custodian for
the Sentinel Square II Mortgage Loan, KeyBank National Association, as Primary
Servicer for the Towers at University Town Center Mortgage Loan, CWCapital
Asset Management LLC, as Special Servicer for the Towers at University Town
Center Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for
the Towers at University Town Center Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Towers at University Town Center Mortgage
Loan, Pentalpha Surveillance LLC, as Operating Advisor for the Towers at
University Town Center Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the Towers
at University Town Center Mortgage Loan, KeyBank National Association, as
Primary Servicer for the Rochester Hotel Portfolio Mortgage Loan, CWCapital
Asset Management LLC, as Special Servicer for the Rochester Hotel Portfolio
Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the
Rochester Hotel Portfolio Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Rochester Hotel Portfolio Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the Rochester Hotel
Portfolio Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Rochester Hotel
Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, as Primary Servicer for the Two Harbor Point Square
Mortgage Loan, LNR Partners, LLC, as Special Servicer for the Two Harbor Point
Square Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Two Harbor Point Square Mortgage Loan, Citibank, N.A., as Custodian for the
Two Harbor Point Square Mortgage Loan, Park Bridge Lender Services LLC, as
Operating Advisor for the Two Harbor Point Square Mortgage Loan, U.S. Bank
National Association, as Servicing Function Participant for the Two Harbor
Point Square Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, as Primary Servicer for the Atrium Center Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Special
Servicer for the Atrium Center Mortgage Loan, Wilmington Trust, National
Association, as Trustee for the Atrium Center Mortgage Loan, Citibank, N.A., as
Custodian for the Atrium Center Mortgage Loan, Park Bridge Lender Services LLC,
as Operating Advisor for the Atrium Center Mortgage Loan, U.S. Bank National
Association, as Servicing Function Participant for the Atrium Center Mortgage
Loan, Midland Loan Services, a Division of PNC Bank, National Association, as
Primary Servicer for the Marriott Charlotte City Center Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Special
Servicer for the Marriott Charlotte City Center Mortgage Loan, Wilmington
Trust, National Association, as Trustee for the Marriott Charlotte City Center
Mortgage Loan, Citibank, N.A., as Custodian for the Marriott Charlotte City
Center Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for
the Marriott Charlotte City Center Mortgage Loan, and U.S. Bank National
Association, as Servicing Function Participant for the Marriott Charlotte City
Center Mortgage Loan.







Dated: March 13, 2023





/s/ Helaine M. Kaplan

Helaine M. Kaplan

President

(senior
officer in charge of securitization of the depositor)