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





I, Leah Nivison, 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 GS Mortgage Securities Trust 2019-GC42 (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:



Midland Loan Services, a Division of PNC Bank, National
Association, as Master Servicer, Midland Loan Services, a Division of PNC Bank,
National Association, as Special Servicer, Wells Fargo Bank, National
Association, as Trustee and Certificate Administrator, Wells Fargo Bank,
National Association, as Custodian, Park Bridge Lender Services LLC, as
Operating Advisor, Computershare Trust Company, National Association, as Servicing
Function Participant for the Certificate Administrator on and after November 1,
2021, Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian on and after November 1, 2021, Midland Loan
Services, a Division of PNC Bank, National Association, as Primary Servicer for
the Diamondback Industrial Portfolio 1 Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Special Servicer for the
Diamondback Industrial Portfolio 1 Mortgage Loan, Wells Fargo Bank, National
Association, as Trustee for the Diamondback Industrial Portfolio 1 Mortgage
Loan, Wells Fargo Bank, National Association, as Custodian for the Diamondback
Industrial Portfolio 1 Mortgage Loan, Pentalpha Surveillance LLC, as Operating
Advisor for the Diamondback Industrial Portfolio 1 Mortgage Loan, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Diamondback Industrial Portfolio 1 Mortgage Loan on and after
November 1, 2021, 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 on and after November 1, 2021, Wells Fargo Bank, National
Association, as Primary Servicer for the 30 Hudson Yards Mortgage Loan, Situs
Holdings, LLC, as Special Servicer for the 30 Hudson Yards Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the 30 Hudson Yards
Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the 30
Hudson Yards Mortgage Loan, CoreLogic Solutions, LLC, as Servicing Function
Participant for the 30 Hudson Yards Mortgage Loan, Computershare Trust Company,
National Association, as Servicing Function Participant for the Custodian for
the 30 Hudson Yards Mortgage Loan on and after November 1, 2021, Midland Loan Services,
a Division of PNC Bank, National Association, as Primary Servicer for the Grand
Canal Shoppes Mortgage Loan, Situs Holdings, LLC, as Special Servicer for the
Grand Canal Shoppes Mortgage Loan, Wells Fargo Bank, National Association, as
Trustee for the Grand Canal Shoppes Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Grand Canal Shoppes Mortgage Loan, Pentalpha
Surveillance LLC, as Operating Advisor for the Grand Canal Shoppes Mortgage
Loan, Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Grand Canal Shoppes Mortgage Loan on and
after November 1, 2021, Midland Loan Services, a Division of PNC Bank, National
Association, as Primary Servicer for the Woodlands Mall Mortgage Loan, Pacific
Life Insurance Company, as Special Servicer for the Woodlands Mall Mortgage
Loan, Wilmington Trust, National Association, as Trustee for the Woodlands Mall
Mortgage Loan, Citibank, N.A., as Custodian for the Woodlands Mall Mortgage
Loan, Pentalpha Surveillance LLC, as Operating Advisor for the Woodlands Mall
Mortgage Loan, U.S. Bank National Association, as Servicing Function
Participant for the Woodlands Mall Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Primary Servicer for the U.S.
Industrial Portfolio V Mortgage Loan, Rialto Capital Advisors, LLC, as Special
Servicer for the U.S. Industrial Portfolio V Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the U.S. Industrial Portfolio V Mortgage
Loan, Citibank, N.A., as Custodian for the U.S. Industrial Portfolio V Mortgage
Loan, Park Bridge Lender Services LLC, as Operating Advisor for the U.S.
Industrial Portfolio V Mortgage Loan, U.S. Bank National Association, as Servicing
Function Participant for the U.S. Industrial Portfolio V Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the USAA Office Portfolio Mortgage Loan, Rialto Capital Advisors,
LLC, as Special Servicer for the USAA Office Portfolio Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the USAA Office
Portfolio Mortgage Loan, Citibank, N.A., as Custodian for the USAA Office
Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor
for the USAA Office Portfolio Mortgage Loan, U.S. Bank National Association, as
Servicing Function Participant for the USAA Office Portfolio Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Millennium Park Plaza Mortgage Loan, Rialto Capital Advisors,
LLC, as Special Servicer for the Millennium Park Plaza Mortgage Loan,
Wilmington Trust, National Association, as Trustee for the Millennium Park
Plaza Mortgage Loan, Citibank, N.A., as Custodian for the Millennium Park Plaza
Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for the
Millennium Park Plaza Mortgage Loan, U.S. Bank National Association, as
Servicing Function Participant for the Millennium Park Plaza Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Powered Shell Portfolio - Manassas Mortgage Loan, Rialto
Capital Advisors, LLC, as Special Servicer for the Powered Shell Portfolio -
Manassas Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Powered Shell Portfolio - Manassas Mortgage Loan, Citibank, N.A., as
Custodian for the Powered Shell Portfolio - Manassas Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Powered Shell Portfolio -
Manassas Mortgage Loan, U.S. Bank National Association, as Servicing Function
Participant for the Powered Shell Portfolio - Manassas Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Powered Shell Portfolio - Ashburn Mortgage Loan, Rialto
Capital Advisors, LLC, as Special Servicer for the Powered Shell Portfolio -
Ashburn Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Powered Shell Portfolio - Ashburn Mortgage Loan, Citibank, N.A., as
Custodian for the Powered Shell Portfolio - Ashburn Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Powered Shell Portfolio -
Ashburn Mortgage Loan, U.S. Bank National Association, as Servicing Function
Participant for the Powered Shell Portfolio - Ashburn Mortgage Loan, Midland
Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Pharr Town Center Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Special Servicer for the Pharr
Town Center Mortgage Loan prior to July 14, 2021, LNR Partners, LLC, asSpecial Servicer for the
Pharr Town Center Mortgage Loan on and after July 14, 2021, Wells Fargo Bank, National
Association, as Trustee for the Pharr Town Center Mortgage Loan, Wells Fargo
Bank, National Association, as Custodian for the Pharr Town Center Mortgage
Loan, Park Bridge Lender Services LLC, as Operating Advisor for the Pharr Town
Center Mortgage Loan, Computershare Trust Company, National Association, as
Servicing Function Participant for the Custodian for the Pharr Town Center
Mortgage Loan on and after November 1, 2021, Wells Fargo Bank, National
Association, as Primary Servicer for the 105 East 17th Street Mortgage Loan,
Rialto Capital Advisors, LLC, as Special Servicer for the 105 East 17th Street
Mortgage Loan, Wilmington Trust, National Association, as Trustee for the 105
East 17th Street Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the 105 East 17th Street Mortgage Loan, Park Bridge Lender
Services LLC, as Operating Advisor for the 105 East 17th Street Mortgage Loan,
CoreLogic Solutions, LLC, as Servicing Function Participant for the 105 East
17th Street Mortgage Loan, Computershare Trust Company, National Association,
as Servicing Function Participant for the Custodian for the 105 East 17th
Street Mortgage Loan on and after November 1, 2021, Wells Fargo Bank, National
Association, as Primary Servicer for the Midland Office Portfolio Mortgage
Loan, Rialto Capital Advisors, LLC, as Special Servicer for the Midland Office
Portfolio Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Midland Office Portfolio Mortgage Loan, Citibank, N.A., as Custodian for
the Midland Office Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as
Operating Advisor for the Midland Office Portfolio Mortgage Loan, CoreLogic
Solutions, LLC, as Servicing Function Participant for the Midland Office
Portfolio Mortgage Loan, and U.S. Bank National Association, as Servicing
Function Participant for the Midland Office Portfolio Mortgage Loan.







Dated:
March 14,
2022





/s/ Leah Nivison

Leah Nivison

Chief Executive Officer

(senior
officer in charge of securitization of the depositor)