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





I, Nicholas Galeone, 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 UBS Commercial Mortgage Trust 2018-C15 (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, Pentalpha Surveillance LLC, as Operating
Advisor, Wells Fargo Bank, National Association, as Primary Servicer for the
Christiana Mall Mortgage Loan, 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, Wells Fargo Bank, National Association,
as Special Servicer for the Christiana Mall Mortgage Loan, Wilmington Trust,
National Association, as Trustee for the Christiana Mall Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the Christiana Mall Mortgage
Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for the
Christiana Mall Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the
Christiana Mall Mortgage Loan, Wells Fargo Bank, National Association, as
Primary Servicer for the Ellsworth Place Mortgage Loan, Midland Loan Services,
a Division of PNC Bank, National Association, as Special Servicer for the
Ellsworth Place Mortgage Loan, Wilmington Trust, National Association, as
Trustee for the Ellsworth Place Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Ellsworth Place Mortgage Loan, Park Bridge
Lender Services LLC, as Operating Advisor for the Ellsworth Place Mortgage
Loan, CoreLogic Solutions, LLC, as Servicing Function Participant for the
Ellsworth Place Mortgage Loan, Computershare Trust Company, National
Association, as Servicing Function Participant for the Custodian for the
Ellsworth Place Mortgage Loan, Midland Loan Services, a Division of PNC Bank,
National Association, as Primary Servicer for the Nebraska Crossing Mortgage
Loan, Rialto Capital Advisors, LLC, as Special Servicer for the Nebraska
Crossing Mortgage Loan, Wells Fargo Bank, National Association, as Trustee for
the Nebraska Crossing Mortgage Loan, Wells Fargo Bank, National Association, as
Custodian for the Nebraska Crossing Mortgage Loan, Park Bridge Lender Services
LLC, as Operating Advisor for the Nebraska Crossing Mortgage Loan, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Nebraska Crossing Mortgage Loan, Midland Loan Services, a
Division of PNC Bank, National Association, as Primary Servicer for the
Clevelander South Beach Mortgage Loan, Rialto Capital Advisors, LLC, as Special
Servicer for the Clevelander South Beach Mortgage Loan, Wells Fargo Bank,
National Association, as Trustee for the Clevelander South Beach Mortgage Loan,
Wells Fargo Bank, National Association, as Custodian for the Clevelander South
Beach Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor for
the Clevelander South Beach Mortgage Loan, Computershare Trust Company,
National Association, as Servicing Function Participant for the Custodian for
the Clevelander South Beach Mortgage Loan, Midland Loan Services, a Division of
PNC Bank, National Association, as Primary Servicer for the Regency Properties
Portfolio Mortgage Loan, Rialto Capital Advisors, LLC, as Special Servicer for
the Regency Properties Portfolio Mortgage Loan, Wells Fargo Bank, National
Association, as Trustee for the Regency Properties Portfolio Mortgage Loan,
Wells Fargo Bank, National Association, as Custodian for the Regency Properties
Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor
for the Regency Properties Portfolio Mortgage Loan, Computershare Trust
Company, National Association, as Servicing Function Participant for the
Custodian for the Regency Properties Portfolio Mortgage Loan, Midland Loan
Services, a Division of PNC Bank, National Association, as Primary Servicer for
the Staples Strategic Industrial Mortgage Loan, CWCapital Asset Management LLC,
as Special Servicer for the Staples Strategic Industrial Mortgage Loan, Wells
Fargo Bank, National Association, as Trustee for the Staples Strategic
Industrial Mortgage Loan, Wells Fargo Bank, National Association, as Custodian
for the Staples Strategic Industrial Mortgage Loan, Pentalpha Surveillance LLC,
as Operating Advisor for the Staples Strategic Industrial Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Staples Strategic Industrial Mortgage
Loan, Midland Loan Services, a Division of PNC Bank, National Association, as
Primary Servicer for the ExchangeRight Net Leased Portfolio 24 Mortgage Loan,
3650 REIT Loan Servicing LLC, as Special Servicer for the ExchangeRight Net
Leased Portfolio 24 Mortgage Loan, Wells Fargo Bank, National Association, as
Trustee for the ExchangeRight Net Leased Portfolio 24 Mortgage Loan, Wells
Fargo Bank, National Association, as Custodian for the ExchangeRight Net Leased
Portfolio 24 Mortgage Loan, Park Bridge Lender Services LLC, as Operating
Advisor for the ExchangeRight Net Leased Portfolio 24 Mortgage Loan,
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Exchange Right Net Leased Portfolio 24
Mortgage Loan, KeyBank National Association, as Primary Servicer for the Saint
Louis Galleria Mortgage Loan, LNR Partners, LLC, as Special Servicer for the
Saint Louis Galleria Mortgage Loan, Wells Fargo Bank, National Association, as
Trustee for the Saint Louis Galleria Mortgage Loan, Wells Fargo Bank, National
Association, as Custodian for the Saint Louis Galleria Mortgage Loan, Pentalpha
Surveillance LLC, as Operating Advisor for the Saint Louis Galleria Mortgage
Loan, Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Saint Louis Galleria Mortgage Loan,
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer for the Great Value Storage Portfolio Mortgage Loan, Midland Loan
Services, a Division of PNC Bank, National Association, as Special Servicer for
the Great Value Storage Portfolio Mortgage Loan, Wells Fargo Bank, National
Association, as Trustee for the Great Value Storage Portfolio Mortgage Loan,
Wells Fargo Bank, National Association, as Custodian for the Great Value
Storage Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as Operating
Advisor for the Great Value Storage Portfolio Mortgage Loan, Computershare
Trust Company, National Association, as Servicing Function Participant for the
Custodian for the Great Value Storage Portfolio Mortgage Loan, Midland Loan
Services, a Division of PNC Bank, National Association, as Primary Servicer for
the Heartland Dental Medical Office Portfolio Mortgage Loan, Rialto Capital
Advisors, LLC, as Special Servicer for the Heartland Dental Medical Office
Portfolio Mortgage Loan, Wilmington Trust, National Association, as Trustee for
the Heartland Dental Medical Office Portfolio Mortgage Loan, Wells Fargo Bank,
National Association, as Custodian for the Heartland Dental Medical Office
Portfolio Mortgage Loan, Park Bridge Lender Services LLC, as Operating Advisor
for the Heartland Dental Medical Office Portfolio Mortgage Loan, and
Computershare Trust Company, National Association, as Servicing Function
Participant for the Custodian for the Heartland Dental Medical Office Portfolio
Mortgage Loan.







Dated:
March 13, 2023





/s/ Nicholas Galeone

Nicholas Galeone

President

(senior
officer in charge of securitization of the depositor)