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





I, Daniel Vinson,
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 BBCMS Mortgage Trust
2019-C4 (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, Rialto Capital Advisors, 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 with respect to the mortgage loans sold to the depositor by UBS AG,
New York Branch, Midland Loan Services, a Division of PNC Bank, National
Association, as Primary Servicer for the ILPT Hawaii Portfolio Mortgage Loan,
Rialto Capital Advisors, LLC, as Special Servicer for the ILPT Hawaii Portfolio
Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the ILPT
Hawaii Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the ILPT Hawaii Portfolio Mortgage Loan, Park Bridge Lender
Services LLC, as Operating Advisor for the ILPT Hawaii Portfolio Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function Participant
for the Custodian for the ILPT Hawaii Portfolio Mortgage Loan, KeyBank National
Association, as Primary Servicer for the 2 North 6th Place Mortgage Loan, Situs
Holdings, LLC, as Special Servicer for the 2 North 6th Place Mortgage Loan,
Wells Fargo Bank, National Association, as Trustee for the 2 North 6th Place
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the 2
North 6th Place Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the 2
North 6th Place Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Town Square Mortgage Loan, Rialto Capital Advisors,
LLC, as Special Servicer for the Town Square Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the Town Square Mortgage Loan, Wells Fargo
Bank, National Association, as Custodian for the Town Square Mortgage Loan,
Park Bridge Lender Services LLC, as Operating Advisor for the Town Square
Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for
the Town Square Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the Town
Square Mortgage Loan, KeyBank National Association, as Primary Servicer for the
10000 Santa Monica Boulevard Mortgage Loan, KeyBank National Association, as
Special Servicer for the 10000 Santa Monica Boulevard Mortgage Loan, Wells
Fargo Bank, National Association, as Trustee for the 10000 Santa Monica Boulevard
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
10000 Santa Monica Boulevard Mortgage Loan, Computershare Trust Company,
National Association, as Servicing Function Participant for the Custodian for
the 10000 Santa Monica Boulevard Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Primary Servicer for the
Vanguard Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC
Bank, National Association, as Special Servicer for the Vanguard Portfolio
Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the
Vanguard Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Vanguard Portfolio Mortgage Loan, Pentalpha Surveillance LLC,
as Operating Advisor for the Vanguard Portfolio Mortgage Loan, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Vanguard Portfolio Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Primary Servicer for the SWVP
Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, as Special Servicer for the SWVP Portfolio Mortgage Loan,
Wells Fargo Bank, National Association, as Trustee for the SWVP Portfolio
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
SWVP Portfolio Mortgage Loan, Pentalpha Surveillance LLC, as Operating Advisor
for the SWVP Portfolio Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the SWVP
Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Primary
Servicer for the ExchangeRight Net Leased Portfolio #27 Mortgage Loan,
Greystone Servicing Company LLC (as successor to C-III Asset Management LLC),
as Special Servicer for the ExchangeRight Net Leased Portfolio #27 Mortgage
Loan, Wilmington Trust, National Association, as Trustee for the ExchangeRight
Net Leased Portfolio #27 Mortgage Loan, Wells Fargo Bank, National Association,
as Custodian for the ExchangeRight Net Leased Portfolio #27 Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the ExchangeRight Net
Leased Portfolio #27 Mortgage Loan, CoreLogic Solutions, LLC, as Servicing
Function Participant for the ExchangeRight Net Leased Portfolio #27 Mortgage
Loan, Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the ExchangeRight Net Leased Portfolio #27
Mortgage Loan, KeyBank National Association, as Primary Servicer for the
Moffett Towers II - Buildings 3 & 4 Mortgage Loan, Situs Holdings, LLC, as
Special Servicer for the Moffett Towers II - Buildings 3 & 4 Mortgage Loan,
Wells Fargo Bank, National Association, as Trustee for the Moffett Towers II -
Buildings 3 & 4 Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Moffett Towers II - Buildings 3 & 4 Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Moffett Towers II - Buildings 3 & 4
Mortgage Loan, Midland Loan Services, a Division of PNC Bank, National
Association, as Primary Servicer for the Visions Hotel Portfolio II Mortgage
Loan, Argentic Services Company LP, as Special Servicer for the Visions Hotel
Portfolio II Mortgage Loan, Wells Fargo Bank, National Association, as Trustee
for the Visions Hotel Portfolio II Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Visions Hotel Portfolio II Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the Visions Hotel
Portfolio II Mortgage Loan, Computershare Trust Company, National Association,
as Servicing Function Participant for the Custodian for the Visions Hotel
Portfolio II Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, as Primary Servicer for the 125 Borinquen Place Mortgage
Loan, Argentic Services Company LP, as Special Servicer for the 125 Borinquen
Place Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the
125 Borinquen Place Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the 125 Borinquen Place Mortgage Loan, Pentalpha Surveillance
LLC, as Operating Advisor for the 125 Borinquen Place Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the 125 Borinquen Place Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the CIRE Equity Retail & Industrial Portfolio Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Special
Servicer for the CIRE Equity Retail & Industrial Portfolio Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the CIRE Equity Retail
& Industrial Portfolio Mortgage Loan, Citibank, N.A., as Custodian for the
CIRE Equity Retail & Industrial Portfolio Mortgage Loan, Pentalpha
Surveillance LLC, as Operating Advisor for the CIRE Equity Retail &
Industrial Portfolio Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the CIRE
Equity Retail & Industrial Portfolio Mortgage Loan, Wells Fargo Bank,
National Association, as Primary Servicer for the Renaissance Center VI Mortgage
Loan, Argentic Services Company LP, as Special Servicer for the Renaissance
Center VI Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Renaissance Center VI Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Renaissance Center VI Mortgage Loan,
Pentalpha Surveillance LLC, as Operating Advisor for the Renaissance Center VI
Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for
the Renaissance Center VI Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the
Renaissance Center VI Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Mount Kemble Mortgage Loan, Argentic Services Company LP,
as Special Servicer for the Mount Kemble Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the Mount Kemble Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the Mount Kemble Mortgage
Loan, Pentalpha Surveillance LLC, as Operating Advisor for the Mount Kemble
Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for
the Mount Kemble Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the Mount
Kemble Mortgage Loan, Midland Loan Services, a Division of PNC Bank, National
Association, as Primary Servicer for the Ambler Yards Mortgage Loan, Rialto
Capital Advisors, LLC, as Special Servicer for the Ambler Yards Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the Ambler Yards
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the
Ambler Yards Mortgage Loan, Pentalpha Surveillance LLC, as Operating Advisor
for the Ambler Yards Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the Ambler
Yards Mortgage Loan, KeyBank National Association, as Primary Servicer for the
Inland Life Storage Portfolio Mortgage Loan, LNR Partners, LLC, as Special
Servicer for the Inland Life Storage Portfolio Mortgage Loan, Citibank, N.A.,
as Trustee for the Inland Life Storage Portfolio Mortgage Loan, Citibank, N.A.,
as Custodian for the Inland Life Storage Portfolio Mortgage Loan, Park Bridge Lender
Services LLC, as Operating Advisor for the Inland Life Storage Portfolio
Mortgage Loan, and Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Inland Life Storage
Portfolio Mortgage Loan.







Dated: March 16, 2023





/s/ Daniel Vinson

Daniel Vinson

Chief Executive
Officer

(senior
officer in charge of securitization of the depositor)