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, Midland Loan Services, a Division of
PNC Bank, National Association, 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 Commercial Real
Estate Services, Inc., as Servicing Function Participant, National Tax Search,
LLC, as Servicing Function Participant, 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, 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, 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, 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, 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, Wells Fargo
Bank, National Association, as Primary Servicer for the Worldwide Plaza
Mortgage Loan, Cohen Financial, a Division of 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 Commercial Real Estate Services, Inc., as Servicing
Function Participant for the Worldwide Plaza Mortgage Loan, National Tax
Search, LLC, as Servicing Function Participant for the Worldwide Plaza Mortgage
Loan, Wells Fargo Bank, National Association, as Primary Servicer for the Griffin
Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, 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 Commercial
Real Estate Services, Inc., as Servicing Function Participant for the Griffin
Portfolio Mortgage Loan, National Tax Search, LLC, as Servicing Function
Participant 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, 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, Wells Fargo Bank, National
Association, as Primary Servicer for The Woods Mortgage Loan, LNR Partners,
LLC, 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 Commercial Real Estate Services, Inc., as Servicing Function
Participant for The Woods Mortgage Loan, National Tax Search, LLC, 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, 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, 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, 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 19, 2020





/s/ Helaine M. Kaplan





President

(senior
officer in charge of securitization of the depositor)