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
prior to May 10, 2023, K-Star Asset Management LLC, as Special Servicer for the
SWVP Portfolio Mortgage Loan on and after May 10, 2023, 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
prior to May 10, 2023, K-Star Asset Management LLC, as Special Servicer for the
CIRE Equity Retail & Industrial Portfolio Mortgage Loan on and after May
10, 2023, 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, U.S. Bank National
Association, as Servicing Function Participant 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, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Inland Life Storage Portfolio Mortgage Loan, and U.S. Bank
National Association, as Servicing Function Participant for the Inland Life
Storage Portfolio Mortgage Loan.







Dated: March 14, 2024





/s/ Daniel Vinson

Daniel Vinson

Chief Executive Officer

(senior officer
in charge of securitization of the depositor)