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

I, Paul Vanderslice, 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 CF 2019-CF1 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:

KeyBank National Association, as Master Servicer, LNR Partners, LLC, as Special Servicer, Citibank, N.A., as Trustee, Citibank, N.A., as Certificate Administrator, Citibank, N.A., as Custodian, Park Bridge Lender Services LLC, as Operating Advisor, U.S. Bank National Association, as Servicing Function Participant, Berkeley Point Capital LLC d/b/a Newmark Knight Frank, as Primary Servicer, KeyBank National Association, as Primary Servicer, KeyBank National Association as Special Servicer, solely with respect to the Irving Market Center Mortgage Loan, Berkeley Point Capital LLC d/b/a Newmark Knight Frank, as Primary Servicer for the Shelbourne Global Portfolio II Mortgage Loan, LNR Partners, LLC, as Special Servicer for the Shelbourne Global Portfolio II Mortgage Loan, Wilmington Trust, National Association, as Trustee for the Shelbourne Global Portfolio II Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the Shelbourne Global Portfolio II Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for the Shelbourne Global Portfolio II Mortgage Loan, KeyBank National Association, as Primary Servicer for the Fairfax Multifamily Portfolio Mortgage Loan, KeyBank National Association, as Special Servicer for the Fairfax Multifamily Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the Fairfax Multifamily Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the Fairfax Multifamily Portfolio Mortgage Loan, Midland Loan Services, a Division of PNC Bank, National Association, as Primary Servicer for the Stern Multifamily Portfolio Mortgage Loan, Rialto Capital Advisors, LLC, as Special Servicer for the Stern Multifamily Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the Stern Multifamily Portfolio Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the Stern Multifamily Portfolio Mortgage Loan, Pentalpha Surveillance LLC, as Operating Advisor for the Stern Multifamily Portfolio Mortgage Loan, KeyBank National Association, as Primary Servicer for the 3 Columbus Circle Mortgage Loan, LNR Partners, LLC, as

Special Servicer for the 3 Columbus Circle Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the 3 Columbus Circle Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the 3 Columbus Circle Mortgage Loan, Pentalpha Surveillance LLC, as Operating Advisor for the 3 Columbus Circle Mortgage Loan, KeyBank National Association, as Primary Servicer for the SSTII Self Storage Portfolio II Mortgage Loan, Midland Loan Services, a Division of PNC Bank, National Association, as Special Servicer for the SSTII Self Storage Portfolio II Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for the SSTII Self Storage Portfolio II Mortgage Loan, Wells Fargo Bank, National Association, as Custodian for the SSTII Self Storage Portfolio II Mortgage Loan, and Pentalpha Surveillance LLC, as Operating Advisor for the SSTII Self Storage Portfolio II Mortgage Loan.

Dated: March 23, 2020

/s/ Paul Vanderslice

Chief Executive Officer

(senior officer in charge of securitization of the depositor)