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 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, 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 and Certificate Administrator 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 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
and Certificate Administrator 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, 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 and
Certificate Administrator 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, 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
Certificate Administrator 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 Certificate
Administrator 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 and Certificate Administrator 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 Certificate
Administrator 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 and Certificate
Administrator 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
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 and Certificate Administrator 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, 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 and Certificate Administrator 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, 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 Certificate
Administrator 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 Certificate Administrator 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 Certificate Administrator 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 20, 2019





/s/ Helaine M. Kaplan





President

(senior
officer in charge of securitization of the depositor)