UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

 Washington, D.C. 20549

 FORM 10-K

 (Mark One)

 x ANNUAL REPORT PURSUANT TO SECTION
13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended December 31, 2023

or

 o TRANSITION
REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the transition period from _____ to _____

Commission file number of the issuing entity: 333-226850-09

 Central Index Key Number of the issuing entity:
0001864196

 BBCMS Mortgage Trust 2021-C10

 (exact name of the issuing entity as specified in its
charter)

 Central Index Key Number of the depositor: 0001541480

 Barclays Commercial Mortgage
Securities LLC

 (exact name of the depositor as specified in its
charter)

 Central Index Key Number of the sponsor: 0001549574

 Barclays Capital Real Estate Inc.

 Central Index Key Number of the sponsor: 0001755531

 Societe Generale Financial
Corporation

 Central Index Key Number of the sponsor: 0001548405

 Starwood Mortgage Capital LLC

 Central Index Key Number of the sponsor: 0001685185

 UBS AG, acting through its branch
located at 1285 Avenue of the Americas, New York, New York

 Central Index Key Number of the sponsor: 0001089877

 KeyBank National Association

 New York

 (State or other jurisdiction of

 incorporation or organization of

 the issuing entity)

 35-7287155

 38-4178152

 38-4178153

 (I.R.S. Employer

 Identification Numbers)

c/o Computershare Trust Company, National Association, as agent for

 Wells Fargo Bank, National Association

 as Certificate Administrator

 9062 Old Annapolis Road

 Columbia, MD

 (Address of principal
executive offices of the issuing entity)

 21045

 (Zip Code)

 Registrant's telephone number,
including area code:

 (212) 412-4000

 Securities registered pursuant to Section 12(b) of the Act:

 Title of each class

 Trading Symbol(s)

 Name of each exchange on which registered

 None

 Securities registered pursuant to Section 12(g) of the
Act: None.

 Indicate by check mark if the registrant is a well-known
seasoned issuer, as defined in Rule 405 of the Securities Act. o Yes
No

 Indicate by check mark if the registrant is not required to
file reports pursuant to Section 13 or Section 15(d) of the Act. o Yes
No

 Indicate by check mark whether the registrant (1) has filed
all reports required to be filed by Section 13 or 15(d) of the Securities
Exchange Act of 1934 during the preceding 12 months (or for such shorter period
that the registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days. Yes o No

 Indicate by check mark whether the registrant has submitted
electronically every Interactive Data File required to be submitted pursuant to
Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the
preceding 12 months (or for such shorter period that the registrant was
required to submit such files).

 Indicate by check mark whether the registrant is a large
accelerated filer, an accelerated filer, a non-accelerated filer, a smaller
reporting company, or an emerging growth company. See the definitions of "large
accelerated filer," "accelerated filer," "smaller reporting company," and
"emerging growth company" in Rule 12b-2 of the Exchange Act.

 Large accelerated
filer o
Accelerated
filer
o

 Non-accelerated
filer

Smaller reporting
company
o

Emerging growth
company
o

 If an emerging growth company, indicate by check mark if the
registrant has elected not to use the extended transition period for complying
with any new or revised financial accounting standards provided pursuant to
Section 13(a) of the Exchange Act. o

 Indicate by check mark whether the registrant has filed a
report on and attestation to its management's assessment of the effectiveness
of its internal control over financial reporting under Section 404(b) of the
Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm
that prepared or issued its audit report. o

 If securities are registered pursuant to Section 12(b) of the
Act, indicate by check mark whether the financial statements of the registrant
included in the filing reflect the correction of an error to previously issued
financial statements. o

 Indicate by check mark whether any of those error corrections
are restatements that required a recovery analysis of incentive-based
compensation received by any of the registrant's executive officers during the
relevant recovery period pursuant to §240.10D-1(b). o

 Indicate by check mark whether the registrant is a shell
company (as defined in Rule 12b-2 of the Act). o Yes No

 State the aggregate market value of the voting and non-voting
common equity held by non-affiliates computed by reference to the price at
which the common equity was last sold, or the average bid and asked price of
such common equity, as of the last business day of the registrant's most
recently completed second fiscal quarter.

 Indicate by check mark whether the registrant has filed all
documents and reports required to be filed by Section 12, 13 or 15(d) of the
Securities Exchange Act of 1934 subsequent to the distribution of securities
under a plan confirmed by a court. o
Yes o
No

 Indicate the number of shares outstanding of each of the
registrant's classes of common stock, as of the latest practicable date.

 DOCUMENTS INCORPORATED BY REFERENCE

 List hereunder the following documents if incorporated by
reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into
which the document is incorporated: (1) Any annual report to security holders;
(2) Any proxy or information statement; and (3) Any prospectus filed pursuant
to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents
should be clearly described for identification purposes (e.g., annual report to
security holders for fiscal year ended December 24, 1980).

 EXPLANATORY NOTES

 The Atlantic Mortgage Loan and the Morris
Corporate Center Mortgage Loan, which constituted approximately 5.9% and 5.8%,
respectively, of the asset pool of the issuing entity as of its cut-off date,
are each an asset of the issuing entity and are each part of a loan combination
that includes (a) with respect to The Atlantic Mortgage Loan, two other pari
passu loans, which are not assets of the issuing entity and (b) with
respect to the Morris Corporate Center Mortgage Loan, three other pari passu
loans, which are not assets of the issuing entity. These loan combinations,
including The Atlantic Mortgage Loan and the Morris Corporate Center Mortgage
Loan, are being serviced and administered pursuant to the Pooling and Servicing
Agreement, which is incorporated by reference as Exhibit 4.1 to this Annual
Report on Form 10-K.

 The Exhibit Index describes
exhibits provided by certain parties (in their capacities indicated on the
Exhibit Index) with respect to the Wyndham National Hotel Portfolio Mortgage
Loan, which constituted approximately 1.1% of the asset pool of the issuing
entity as of its cut-off date. The Wyndham National Hotel Portfolio
Mortgage Loan is an asset of the issuing entity and is part of a loan
combination that includes the Wyndham National Hotel Portfolio Mortgage Loan
and eleven other pari passu loans, which are not assets of the issuing
entity. A pari passu portion of the loan combination was securitized in the
UBS Commercial Mortgage Trust 2019-C18 transaction, Commission File Number
333-227784-05 (the " UBS 2019-C18 Transaction "). This loan combination,
including the Wyndham National Hotel Portfolio Mortgage Loan, is being serviced
and administered pursuant to the pooling and servicing agreement for the UBS
2019-C18 Transaction, which is incorporated by reference as Exhibit 4.2 to this
Annual Report on Form 10-K.

 The Exhibit Index describes
exhibits provided by certain parties (in their capacities indicated on the
Exhibit Index) with respect to the Kings Plaza Mortgage Loan, which constituted
approximately 2.4% of the asset pool of the issuing entity as of its cut-off
date. The Kings Plaza Mortgage Loan is an asset of the issuing entity and
is part of a loan combination that includes the Kings Plaza Mortgage Loan and
fourteen other pari passu loans, which are not assets of the issuing
entity. A pari passu portion of the loan combination was securitized in
the Benchmark 2020-B17 Mortgage Trust transaction, Commission File Number
333-226123-08 (the " Benchmark 2020-B17 Transaction "). This loan
combination, including the Kings Plaza Mortgage Loan, is being serviced and
administered pursuant to the pooling and servicing agreement for the Benchmark
2020-B17 Transaction, which is incorporated by reference as Exhibit 4.3 to this
Annual Report on Form 10-K.

 The Exhibit Index describes exhibits
provided by certain parties (in their capacities indicated on the Exhibit
Index) with respect to the MGM Grand & Mandalay Bay Mortgage Loan, which
constituted approximately 5.8% of the asset pool of the issuing entity as of
its cut-off date. The MGM Grand & Mandalay Bay Mortgage Loan is an
asset of the issuing entity and is part of a loan combination that includes the
MGM Grand & Mandalay Bay Mortgage Loan, forty-eight other pari passu
loans and twenty-four subordinate companion loans, which are not assets of the
issuing entity. A pari passu portion of the loan combination was
securitized in the BX Commercial Mortgage Trust 2020-VIVA transaction (the " BX
2020-VIVA Transaction "). This loan combination, including the MGM Grand
& Mandalay Bay Mortgage Loan, is being serviced and administered pursuant
to the trust and servicing agreement for the BX 2020-VIVA Transaction, which is
incorporated by reference as Exhibit 4.4 to this Annual Report on Form 10-K.

 The master servicer of a pooling
and servicing agreement or trust and servicing agreement also functions as the
primary servicer of the related mortgage loans serviced and administered
pursuant to such agreement unless a separate primary servicer is identified
herein. If this report does not identify a separate primary servicer, the
servicer compliance statement provided by the master servicer under any such
agreement also encompasses its responsibilities as primary servicer of the
related mortgage loan or mortgage loans.

 KeyBank National Association is
the master servicer of the mortgage loans serviced under the Pooling and
Servicing Agreement and the primary servicer of the MGM Grand & Mandalay
Bay Mortgage Loan. As a result, KeyBank National Association is a "servicer" as
defined in Item 1108(a)(2)(iii) of Regulation AB, in the capacities described
above, because it is servicing mortgage loans that constituted 10% or more of
the assets of the issuing entity as of its cut-off date. The assessments of
compliance with applicable servicing criteria, accountants' attestation reports
and servicer compliance statements delivered by KeyBank National Association in
the capacities described above are listed in the Exhibit Index.

 Rialto Capital Advisors, LLC is
the special servicer of the mortgage loans serviced under the Pooling and
Servicing Agreement and the Wyndham National Hotel Portfolio Mortgage Loan. As
a result, Rialto Capital Advisors, LLC is a "servicer" as defined in Item
1108(a)(2)(iii) of Regulation AB, in the capacities described above, because it
is servicing mortgage loans that constituted 10% or more of the assets of the
issuing entity as of its cut-off date. The assessments of compliance with
applicable servicing criteria, accountants' attestation reports and servicer
compliance statements delivered by Rialto Capital Advisors, LLC in the
capacities described above are listed in the Exhibit Index.

 Wells Fargo Bank, National
Association is the certificate administrator of the mortgage loans serviced
under the Pooling and Servicing Agreement and the primary servicer of the
Wyndham National Hotel Portfolio Mortgage Loan. As a result, Wells Fargo Bank,
National Association is a "servicer" as defined in Item 1108(a)(2)(iii) of
Regulation AB, in the capacities described above, because it is servicing mortgage
loans that constituted 10% or more of the assets of the issuing entity as of
its cut-off date. The assessments of compliance with applicable servicing
criteria, accountants' attestation reports and servicer compliance statements
delivered by Wells Fargo Bank, National Association in the capacities described
above are listed in the Exhibit Index.

 Wells Fargo Bank, National
Association is the custodian of the mortgage loans serviced under the Pooling
and Servicing Agreement, the Kings Plaza Mortgage Loan and the Wyndham National
Hotel Portfolio Mortgage Loan. As a result, Wells Fargo Bank, National
Association is a servicing function participant in the capacities described
above, because it is servicing mortgage loans that constituted 5% or more of
the assets of the issuing entity as of its cut-off date. The assessments of
compliance with applicable servicing criteria and accountants' attestation
reports delivered by Wells Fargo Bank, National Association in the capacities
described above are listed in the Exhibit Index.

 Pentalpha Surveillance LLC is the
operating advisor of the mortgage loans serviced under the Pooling and
Servicing Agreement and the Kings Plaza Mortgage Loan. As a result,
Pentalpha Surveillance LLC is a servicing function participant in the
capacities described above, because it is servicing mortgage loans that
constituted 5% or more of the assets of the issuing entity as of its cut-off
date. The assessments of compliance with applicable servicing criteria and
accountants' attestation reports delivered by Pentalpha Surveillance LLC in the
capacities described above are listed in the Exhibit Index.

 Wells Fargo Bank, National
Association acts as trustee of The Atlantic Mortgage Loan, the Morris Corporate
Center Mortgage Loan and the Kings Plaza Mortgage Loan. Pursuant to the
Pooling and Servicing Agreement and the pooling and servicing agreement for the
Benchmark 2020-B17 Transaction, the trustee is required to provide an
assessment of compliance with applicable servicing criteria solely with respect
to Item 1122(d)(2)(iii) of Regulation AB (regarding advances of funds or
guarantees regarding collections, cash flows or distributions, and any interest
or other fees charged for such advances, are made, reviewed and approved as
specified in the transaction agreements). However, during the reporting period,
the trustee did not perform any servicing function with respect to the
servicing criteria specified in Item 1122(d)(2)(iii) of Regulation AB.
The master servicer or the special servicer, to the extent required, performed
the servicing function identified with respect to Item 1122(d)(2)(iii) of
Regulation AB, and each such party included Item 1122(d)(2)(iii) of Regulation
AB in the assessment of compliance with applicable servicing criteria and accountant's
attestation report for the subject transaction. As a result, this Annual
Report on Form 10-K does not include an assessment of compliance with
applicable servicing criteria of the trustee. One or more other servicers of
The Atlantic Mortgage Loan, the Morris Corporate Center Mortgage Loan and the
Kings Plaza Mortgage Loan have delivered one or more assessments of compliance
with respect to Item 1122(d)(2)(iii) of Regulation AB.

 Wilmington Trust, National
Association acts as trustee of the Wyndham National Hotel Portfolio Mortgage
Loan and the MGM Grand & Mandalay Bay Mortgage Loan. Pursuant to the
pooling and servicing agreement for the UBS 2019-C18 Transaction and the trust
and servicing agreement for the BX 2020-VIVA Transaction, the trustee is
required to provide an assessment of compliance with applicable servicing
criteria solely with respect to Item 1122(d)(2)(iii) of Regulation AB
(regarding advances of funds or guarantees regarding collections, cash flows or
distributions, and any interest or other fees charged for such advances, are
made, reviewed and approved as specified in the transaction agreements).
However, during the reporting period, the trustee did not perform any servicing
function with respect to the servicing criteria specified in Item
1122(d)(2)(iii) of Regulation AB. The master servicer or the special
servicer, to the extent required, performed the servicing function identified
with respect to Item 1122(d)(2)(iii) of Regulation AB, and each such party
included Item 1122(d)(2)(iii) of Regulation AB in the assessment of compliance
with applicable servicing criteria and accountant's attestation report for the
subject transaction. As a result, this Annual Report on Form 10-K does
not include an assessment of compliance with applicable servicing criteria of
the trustee. One or more other servicers of the Wyndham National Hotel
Portfolio Mortgage Loan and the MGM Grand & Mandalay Bay Mortgage Loan have
delivered one or more assessments of compliance with respect to Item 1122(d)(2)(iii)
of Regulation AB.

 This Annual Report on Form 10-K
includes an assessment of compliance with applicable servicing criteria and an
accountant's attestation report from U.S. Bank National Association. This
entity was engaged by Citibank, N.A., as custodian of the MGM Grand &
Mandalay Bay Mortgage Loan, to perform certain custodial services. These
custodial services are servicing functions included within the servicing
criteria set forth in Items 1122(d)(4)(i) and 1122(d)(4)(ii) of Regulation AB.
Therefore, under the principles-based definition of "servicer" set forth in
Item 1101(j) or Regulation AB that looks to the functions that an entity
performs, this vendor is a "servicer" for the purposes of Item 1122 of
Regulation AB. See Compliance and Disclosure Interpretations, Section 301.01
(Item 1101(j)).

 This Annual Report on Form 10-K
includes assessments of compliance with applicable servicing criteria and
accountants' attestation reports from CoreLogic Solutions, LLC. This
entity was engaged by the primary servicer of the Wyndham National Hotel
Portfolio Mortgage Loan to remit tax payments received from the escrow accounts
of borrowers to local taxing authorities, to report tax amounts due, to verify
tax parcel information, and to verify non-escrow tax payments. These servicing
functions are included within the servicing criteria set forth in Items
1122(d)(4)(xi) and 1122(d)(4)(xii) of Regulation AB. Therefore, under the
principles-based definition of "servicer" set forth in Item 1101(j) of Regulation
AB that looks to the functions that an entity performs, this vendor is a
"servicer" for the purposes of Item 1122 of Regulation AB. See
Compliance and Disclosure Interpretations, Section 301.01 (Item 1101(j)).

 This Annual
Report on Form 10-K includes an assessment of compliance with applicable
servicing criteria, accountants' attestation report and servicer compliance
statement from Computershare Trust Company, National Association (" CTCNA ").
CTCNA was engaged by Wells Fargo Bank, National Association (" Wells Fargo "),
in its capacity as certificate administrator and custodian, to perform certain
specified servicing functions identified in the assessment of compliance with
applicable servicing criteria and accountants' attestation reports. Wells
Fargo engaged CTCNA in connection with the sale of Wells Fargo's corporate
trust services business to CTCNA and its affiliates. Further, under the
principles-based definition of "servicer" set forth in Item 1101(j) of
Regulation AB that looks to the functions that an entity performs, this party
is a "servicer" for the purposes of Item 1123 of Regulation AB. See
Compliance and Disclosure Interpretations, Section 301.01 (Item 1101(j)).

 The assessments of compliance with
applicable servicing criteria, accountants' attestation reports and servicer
compliance statements of the certificate administrator of the Wyndham National
Hotel Portfolio Mortgage Loan, the Kings Plaza Mortgage Loan and the MGM Grand
& Mandalay Bay Mortgage Loan are omitted from this Annual Report on Form
10-K as the certificate administrator pursuant to the related pooling and
servicing agreement or trust and servicing agreement does not perform any
activities that address servicing criteria with respect to the issuing entity
and because they are each not a "servicer" that meets the criteria in Item
1108(a)(2)(i) through (iii) of Regulation AB.

 With respect to the pari passu
loan combinations that include the Kings Plaza Mortgage Loan, the MGM Grand
& Mandalay Bay Mortgage Loan and the Wyndham National Hotel Portfolio
Mortgage Loan, (i) the reports on assessment of compliance with servicing
criteria and attestation reports on assessment of compliance with servicing
criteria of Park Bridge Lender Services LLC as operating advisor of the Wyndham
National Hotel Portfolio Mortgage Loan, Midland Loan Services, a Division of
PNC Bank, National Association as primary servicer of the Kings Plaza Mortgage
Loan and special servicer of the Kings Plaza Mortgage Loan prior to April 27,
2023 and K-Star Asset Management LLC as special servicer of the Kings Plaza
Mortgage Loan on and after April 27, 2023 listed on the Exhibit Index are
omitted from this Annual Report on Form 10-K as they are not required to be
included on this Annual Report on Form 10-K per Instruction 3 to Item 1122 of
Regulation AB because they are parties performing activities that address
servicing criteria relating to 5% or less of the assets of the issuing entity;
and (ii) the servicer compliance statements of Midland Loan Services, a
Division of PNC Bank, National Association as primary servicer of the Kings
Plaza Mortgage Loan and special servicer of the Kings Plaza Mortgage Loan prior
to April 27, 2023, K-Star Asset Management LLC as special servicer of the Kings
Plaza Mortgage Loan on and after April 27, 2023 and Situs Holdings, LLC as
special servicer of the MGM Grand & Mandalay Bay Mortgage Loan listed on
the Exhibit Index are omitted from this Annual Report on Form 10-K as they are
not required by Item 1123 of Regulation AB to be included on this Annual Report
on Form 10-K because they are each an unaffiliated party that is not a
"servicer" that meets the criteria in Item 1108(a)(2)(i) through (iii) of
Regulation AB.

 Item 1. Business.

 Item 1A. Risk Factors.

 Item 1B. Unresolved Staff Comments.

 None.

 Item 1C. Cybersecurity.

 Item 2. Properties.

 Item 3. Legal Proceedings.

 Item 4. Mine Safety Disclosures.

 Item 5. Market for Registrant's Common Equity,
Related Stockholder Matters and Issuer Purchases of Equity Securities.

 Item 6. [Reserved]

 Item 7. Management's Discussion and Analysis of
Financial Condition and Results of Operations.

 Item 7A. Quantitative and Qualitative Disclosures
About Market Risk.

 Item 8. Financial Statements and Supplementary Data.

 Item 9. Changes in and Disagreements With
Accountants on Accounting and Financial Disclosure.

 Item 9A. Controls and Procedures.

 Item 9B. Other Information.

 None.

 Item 9C. Disclosure Regarding Foreign Jurisdictions
that Prevent Inspections.

 None.

 Item 10. Directors, Executive Officers and Corporate
Governance.

 Item 11. Executive Compensation.

 Item 12. Security Ownership of Certain Beneficial
Owners and Management and Related Stockholder Matters.

 Item 13. Certain Relationships and Related
Transactions, and Director Independence.

 Item 14. Principal Accountant Fees and Services.

 ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB

 Item 1112(b) of Regulation AB, Significant Obligor
Financial Information.

 No single obligor represents 10% or more of the pool assets
held by the issuing entity.

 Item 1114(b)(2) of Regulation AB, Significant Enhancement
Provider Financial Information.

 No entity or group of affiliated entities provides any external credit
enhancement or other support for the certificates within this transaction as
described under Item 1114(a) of Regulation AB.

 Item 1115(b) of Regulation AB, Certain Derivatives
Instruments (Financial Information).

 No entity or group of affiliated entities provides any
derivative instruments or other support for the certificates within this
transaction as described under Item 1115 of Regulation AB.

 Item 1117 of Regulation AB, Legal Proceedings.

 The registrant knows of no material pending legal proceeding
involving the trust or any party related to the trust, other than routine
litigation incidental to the duties of those respective parties, and the
following, with respect to Wells Fargo Bank, National Association, as
certificate administrator, as trustee and as custodian.

 In December 2014, Phoenix Light SF Limited (Phoenix Light)
and certain related entities filed a complaint in the United States District
Court for the Southern District of New York alleging claims against Wells Fargo
Bank, N.A., in its capacity as trustee for a number of residential
mortgage-backed securities (RMBS) trusts. Complaints raising similar
allegations have been filed by Commerzbank AG in the Southern District of New
York, IKB International and IKB Deutsche Industriebank (together, IKB) in New
York state court, and Park Royal I LLC and Park Royal II LLC in New York state
court. In each case, the plaintiffs allege that Wells Fargo Bank, N.A., as
trustee, caused losses to investors, and plaintiffs assert causes of action
based upon, among other things, the trustee's alleged failure to notify and
enforce repurchase obligations of mortgage loan sellers for purported breaches
of representations and warranties, notify investors of alleged events of
default, and abide by appropriate standards of care following alleged events of
default. In July 2022, the district court dismissed Phoenix Light's claims and
certain of the claims asserted by Commerzbank AG, and subsequently entered
judgment in each case in favor of Wells Fargo Bank, N.A. In August 2022,
Phoenix Light and Commerzbank AG each appealed the district court's decision to
the United States Court of Appeals for the Second Circuit. Phoenix Light
dismissed its appeal in May 2023, terminating its case. In November 2023, Wells
Fargo Bank, N.A. entered into an agreement with IKB to resolve IKB's claims.
Wells Fargo Bank, N.A. previously settled two class actions filed by
institutional investors and an action filed by the National Credit Union
Administration with similar allegations.

 Item 1119 of Regulation AB, Affiliations and Certain
Relationships and Related Transactions.

 The information regarding this Item has been previously
provided in the prospectus of the Registrant relating to the issuing entity
filed on July 15, 2021 pursuant to Rule 424(b)(2).

 Item 1122 of Regulation AB, Compliance with Applicable
Servicing Criteria.

 The reports on assessments of compliance with the servicing
criteria for asset-backed securities and related attestation reports on such
assessments of compliance with respect to the mortgage loans are attached
hereto under Item 15 to this Annual Report on Form 10-K. Attached as Exhibit AA
to the Pooling and Servicing Agreement incorporated by reference as Exhibit 4.1
to this Annual Report on Form 10-K is a chart identifying the entities
participating in a servicing function for the transaction responsible for each
applicable servicing criteria set forth in Item 1122(d).

 The reports on assessments of compliance with the servicing
criteria for asset-backed securities and related attestation reports on such
assessments of compliance with respect to the Wyndham National Hotel Portfolio
Mortgage Loan, which is being serviced and administered pursuant to the pooling
and servicing agreement for the UBS 2019-C18 Transaction, are attached hereto
under Item 15 to this Annual Report on Form 10-K. Attached as Exhibit Z to the
pooling and servicing agreement for the UBS 2019-C18 Transaction incorporated
by reference as Exhibit 4.2 to this Annual Report on Form 10-K is a chart
identifying the entities participating in a servicing function for the UBS
2019-C18 Transaction responsible for each applicable servicing criteria set
forth in Item 1122(d).

 The reports on assessments of compliance with the servicing
criteria for asset-backed securities and related attestation reports on such
assessments of compliance with respect to the Kings Plaza Mortgage Loan, which
is being serviced and administered pursuant to the pooling and servicing
agreement for the Benchmark 2020-B17 Transaction, are attached hereto under
Item 15 to this Annual Report on Form 10-K. Attached as Exhibit AA to the
pooling and servicing agreement for the Benchmark 2020-B17 Transaction
incorporated by reference as Exhibit 4.3 to this Annual Report on Form 10-K is
a chart identifying the entities participating in a servicing function for the
Benchmark 2020-B17 Transaction responsible for each applicable servicing
criteria set forth in Item 1122(d).

 The reports on assessments of compliance with the servicing
criteria for asset-backed securities and related attestation reports on such
assessments of compliance with respect to the MGM Grand & Mandalay Bay
Mortgage Loan, which is being serviced and administered pursuant to the trust
and servicing agreement for the BX 2020-VIVA Transaction, are attached hereto
under Item 15 to this Annual Report on Form 10-K. Attached as Exhibit L to the
trust and servicing agreement for the BX 2020-VIVA Transaction incorporated by
reference as Exhibit 4.4 to this Annual Report on Form 10-K is a chart
identifying the entities participating in a servicing function for the BX
2020-VIVA Transaction responsible for each applicable servicing criteria set
forth in Item 1122(d).

 Item 1123 of Regulation AB, Servicer Compliance Statement.

 The servicer compliance statements are attached as Exhibits
to this Annual Report on Form 10-K.

 Item 15. Exhibit and Financial Statement Schedules.

 (a) The following is a list of documents filed as part of
this Annual Report on Form 10-K:

 (1) Not applicable

 (2) Not applicable

 (3) See below

 4.1
 Pooling and Servicing Agreement, dated as of July 1,
2021, between Barclays Commercial Mortgage Securities LLC, as Depositor,
KeyBank National Association, as Master Servicer, Rialto Capital Advisors, LLC,
as Special Servicer, Wells Fargo Bank, National Association, as Certificate
Administrator, Wells Fargo Bank, National Association, as Trustee, and
Pentalpha Surveillance LLC, as Operating Advisor and as Asset Representations
Reviewer (filed as Exhibit 4.1 to the registrant's Current Report on Form 8-K
filed on July 15, 2021 under Commission File No. 333-226850-09 and incorporated
by reference herein).

 4.2
 Pooling and Servicing Agreement, dated as of December 1,
2019, among UBS Commercial Mortgage Securitization Corp., as Depositor, Wells
Fargo Bank, National Association, as Master Servicer, Rialto Capital Advisors,
LLC, as Special Servicer, Wells Fargo Bank, National Association, as
Certificate Administrator, Wilmington Trust, National Association, as Trustee,
and Park Bridge Lender Services LLC, as Operating Advisor and as Asset
Representations Reviewer (filed as Exhibit 4.4 to the registrant's Current

 4.3
 Pooling and Servicing Agreement, dated as of March 1,
2020, between J.P. Morgan Chase Commercial Mortgage Securities Corp., as
Depositor, 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
Certificate Administrator, Wells Fargo Bank, National Association, as Trustee,
and Pentalpha Surveillance LLC, as Operating Advisor and as Asset
Representations Reviewer (filed as Exhibit 4.3 to the registrant's Current

 4.4
 Trust and Servicing Agreement, dated as of May 5, 2020,
by and among Citigroup Commercial Mortgage Securities Inc., as Depositor,
KeyBank National Association, as Servicer, Situs Holdings, LLC, as Special
Servicer, Wilmington Trust, National Association, as Trustee, and Citibank,
N.A., as Certificate Administrator (filed as Exhibit 4.2 to the registrant's
Current Report on Form 8-K filed on July 15, 2021 under Commission File No.

 4.5
 Agreement Between Note Holders, dated as of February 17,
2021, by and among Societe Generale Financial Corporation, as Initial Note A-1
Holder, Societe Generale Financial Corporation, as Initial Note A-2 Holder,
Societe Generale Financial Corporation, as Initial Note A-3 Holder, Societe
Generale Financial Corporation, as Initial Note A-4 Holder, Societe Generale
Financial Corporation, as Initial Note A-5 Holder, and Societe Generale
Financial Corporation, as Initial Note A-6 Holder (filed as Exhibit 4.5 to the
registrant's Current Report on Form 8-K filed on July 15, 2021 under Commission
File No. 333-226850-09 and incorporated by reference herein).

 4.6
 Amended and Restated Agreement Between Noteholders, dated
as of July 23, 2020, by and among Citi Real Estate Funding Inc., as Initial
Noteholder of Note A-5, Note A-9, Note B-5-A, Note B-9-A and Note B-5-B,
Barclays Capital Real Estate Inc., as Initial Noteholder of Note A-6, Note
B-6-A and Note B-6-B, German American Capital Corporation, as Initial
Noteholder of Note A-7, B-7-A and Note B-7-B, Societe Generale Financial
Corporation, as Initial Noteholder of Note A-8, Note A-12, Note B-8-A, B-12-A
and Note B-8-B, Barclays Bank PLC, as Initial Noteholder of Note A-10 and Note
B-10-A, Deutsche Bank AG, New York Branch, as Initial Noteholder of Note A-11
and Note B-11-A, Wilmington Trust, National Association, as trustee on behalf
of the registered holders of the BX Commercial Mortgage Trust 2020-VIVA,
Commercial Mortgage Pass-Through Certificates, Series 2020-VIVA, as Initial
Noteholder of Note A-1, Note A-2, Note A-3, Note A-4, Note B-1-A, Note B-2-A, Note
B-3-A, Note B-4-A, Note B-1-B, Note B-2-B, Note B-3-B, Note B-4-B, Note C-1,
Note C-2, Note C-3 and Note C-4, and Citibank, N.A., as Initial Agent (filed as
Exhibit 4.6 to the registrant's Current Report on Form 8-K filed on July 15,
2021 under Commission File No. 333-226850-09 and incorporated by reference
herein).

 4.7
 Agreement Between Note Holders, dated as of July 15,
2021, by and between UBS AG, by and through its branch office at 1285 Avenue of
the Americas, New York, New York, as the Note A-1 Holder, UBS AG, by and
through its branch office at 1285 Avenue of the Americas, New York, New York,
as Note A-2 Holder, UBS AG, by and through its branch office at 1285 Avenue of
the Americas, New York, New York, as Note A-3-1 Holder, UBS AG, by and through
its branch office at 1285 Avenue of the Americas, New York, New York, as Note
A-3-2 Holder, UBS AG, by and through its branch office at 1285 Avenue of the
Americas, New York, New York, as Note A-4 Holder, and UBS AG, by and through
its branch office at 1285 Avenue of the Americas, New York, New York, as Note
A-5 Holder (filed as Exhibit 4.7 to the registrant's Current Report on Form 8-K
filed on July 15, 2021 under Commission File No. 333-226850-09 and incorporated
by reference herein).

 4.8
 Co-Lender Agreement, dated as of December 3, 2019, by and
among JPMorgan Chase Bank, National Association, as Initial Note 1 Holder, Societe
Generale Financial Corporation, as Initial Note 2 Holder, and Wells Fargo Bank,
National Association, as Initial Note 3 Holder (filed as Exhibit 4.8 to the
registrant's Current Report on Form 8-K filed on July 15, 2021 under Commission
File No. 333-226850-09 and incorporated by reference herein).

 4.9
 Agreement Between Note Holders, dated as of December 20,
2019, by and between UBS AG, by and through its branch office at 1285 Avenue of
the Americas, New York, New York, as Initial Note A-1 Holder, UBS AG, by and
through its branch office at 1285 Avenue of the Americas, New York, New York,
as Initial Note A-2 Holder, UBS AG, by and through its branch office at 1285
Avenue of the Americas, New York, New York, as Initial Note A-3 Holder, UBS AG,
by and through its branch office at 1285 Avenue of the Americas, New York, New
York, as Initial Note A-4 Holder, UBS AG, by and through its branch office at
1285 Avenue of the Americas, New York, New York, as Initial Note A-5 Holder,
UBS AG, by and through its branch office at 1285 Avenue of the Americas, New
York, New York, as Initial Note A-6 Holder, UBS AG, by and through its branch
office at 1285 Avenue of the Americas, New York, New York, as Initial Note A-7
Holder, UBS AG, by and through its branch office at 1285 Avenue of the
Americas, New York, New York, as Initial Note A-8 Holder, UBS AG, by and through
its branch office at 1285 Avenue of the Americas, New York, New York, as
Initial Note A-9 Holder, UBS AG, by and through its branch office at 1285
Avenue of the Americas, New York, New York, as Initial Note A-10 Holder, UBS
AG, by and through its branch office at 1285 Avenue of the Americas, New York,
New York, as Initial Note A-11 Holder, and UBS AG, by and through its branch
office at 1285 Avenue of the Americas, New York, New York, as Initial Note A-12
Holder (filed as Exhibit 4.9 to the registrant's Current Report on Form 8-K
filed on July 15, 2021 under Commission File No. 333-226850-09 and incorporated
by reference herein).

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

Reports on assessment of compliance with servicing criteria for asset-backed
securities.

 33.1
 KeyBank National Association, as Master Servicer

 33.2

 33.3
 Wells Fargo Bank, National Association, as Trustee
and Certificate Administrator

 33.4
Custodian

 33.5
 Pentalpha Surveillance LLC, as Operating Advisor

 33.6
as Servicing Function Participant for the Certificate Administrator

 33.7
as Servicing Function Participant for the Custodian

 33.8
of The Atlantic Mortgage Loan (see Exhibit 33.1)

 33.9
of The Atlantic Mortgage Loan (see Exhibit 33.2)

 33.10
Wells Fargo Bank, National Association, as Trustee of The Atlantic Mortgage
Loan (Omitted. See Explanatory Notes.)

 33.11
Custodian of The Atlantic Mortgage Loan (see Exhibit 33.4)

 33.12
The Atlantic Mortgage Loan (see Exhibit 33.5)

 33.13
as Servicing Function Participant for the Custodian (see Exhibit 33.7)

 33.14
of the Morris Corporate Center Mortgage Loan (see Exhibit 33.1)

 33.15
of the Morris Corporate Center Mortgage Loan (see Exhibit 33.2)

 33.16
Wells Fargo Bank, National Association, as Trustee of the Morris Corporate
Center Mortgage Loan (Omitted. See Explanatory Notes.)

 33.17
Custodian of the Morris Corporate Center Mortgage Loan (see Exhibit 33.4)

 33.18
the Morris Corporate Center Mortgage Loan (see Exhibit 33.5)

 33.19
as Servicing Function Participant for the Custodian (see Exhibit 33.7)

 33.20
 Wells Fargo Bank, National Association, as Primary
Servicer of the Wyndham National Hotel Portfolio Mortgage Loan

 33.21
of the Wyndham National Hotel Portfolio Mortgage Loan (see Exhibit 33.2)

 33.22
Wilmington Trust, National Association, as Trustee of the Wyndham National
Hotel Portfolio Mortgage Loan (Omitted. See Explanatory Notes.)

 33.23
Custodian of the Wyndham National Hotel Portfolio Mortgage Loan (see Exhibit
33.4)

 33.24
Park Bridge Lender Services LLC, as Operating Advisor of the Wyndham National
Hotel Portfolio Mortgage Loan (Omitted. See Explanatory Notes.)

 33.25
 CoreLogic Solutions, LLC, as Servicing Function
Participant of the Wyndham National Hotel Portfolio Mortgage Loan

 33.26
as Servicing Function Participant for the Custodian (see Exhibit 33.7)

 33.27
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer of the Kings Plaza Mortgage Loan (Omitted. See Explanatory Notes.)

 33.28
Midland Loan Services, a Division of PNC Bank, National Association, as Special
Servicer of the Kings Plaza Mortgage Loan prior to April 27, 2023 (Omitted. See
Explanatory Notes.)

 33.29
K-Star Asset Management LLC, as Special Servicer of the Kings Plaza Mortgage
Loan on and after April 27, 2023 (Omitted. See Explanatory Notes.)

 33.30
Wells Fargo Bank, National Association, as Trustee of the Kings Plaza Mortgage
Loan (Omitted. See Explanatory Notes.)

 33.31
Custodian of the Kings Plaza Mortgage Loan (see Exhibit 33.4)

 33.32
the Kings Plaza Mortgage Loan (see Exhibit 33.5)

 33.33
as Servicing Function Participant for the Custodian (see Exhibit 33.7)

 33.34
of the MGM Grand & Mandalay Bay Mortgage Loan (see Exhibit 33.1)

 33.35
 Situs Holdings, LLC, as Special Servicer of the
MGM Grand & Mandalay Bay Mortgage Loan

 33.36
Wilmington Trust, National Association, as Trustee of the MGM Grand &
Mandalay Bay Mortgage Loan (Omitted. See Explanatory Notes.)

 33.37
 Citibank, N.A., as Custodian of the MGM Grand
& Mandalay Bay Mortgage Loan

 33.38
 U.S. Bank National Association, as Servicing
Function Participant of the MGM Grand & Mandalay Bay Mortgage Loan

 Attestation
reports on assessment of compliance with servicing criteria for asset-backed
securities.

 34.1
 KeyBank National Association, as Master Servicer

 34.2

 34.3
 Wells Fargo Bank, National Association, as Trustee
and Certificate Administrator

 34.4
Custodian

 34.5
 Pentalpha Surveillance LLC, as Operating Advisor

 34.6
as Servicing Function Participant for the Certificate Administrator

 34.7
as Servicing Function Participant for the Custodian

 34.8
of The Atlantic Mortgage Loan (see Exhibit 34.1)

 34.9
 Rialto Capital Advisors, LLC, as Special Servicer of
The Atlantic Mortgage Loan (see Exhibit 34.2)

 34.10
Wells Fargo Bank, National Association, as Trustee of The Atlantic Mortgage
Loan (Omitted. See Explanatory Notes.)

 34.11
Custodian of The Atlantic Mortgage Loan (see Exhibit 34.4)

 34.12
The Atlantic Mortgage Loan (see Exhibit 34.5)

 34.13
as Servicing Function Participant for the Custodian (see Exhibit 34.7)

 34.14
of the Morris Corporate Center Mortgage Loan (see Exhibit 34.1)

 34.15
of the Morris Corporate Center Mortgage Loan (see Exhibit 34.2)

 34.16
Wells Fargo Bank, National Association, as Trustee of the Morris Corporate
Center Mortgage Loan (Omitted. See Explanatory Notes.)

 34.17
Custodian of the Morris Corporate Center Mortgage Loan (see Exhibit 34.4)

 34.18
the Morris Corporate Center Mortgage Loan (see Exhibit 34.5)

 34.19
as Servicing Function Participant for the Custodian (see Exhibit 34.7)

 34.20
 Wells Fargo Bank, National Association, as Primary
Servicer of the Wyndham National Hotel Portfolio Mortgage Loan

 34.21
of the Wyndham National Hotel Portfolio Mortgage Loan (see Exhibit 34.2)

 34.22
Wilmington Trust, National Association, as Trustee of the Wyndham National
Hotel Portfolio Mortgage Loan (Omitted. See Explanatory Notes.)

 34.23
Custodian of the Wyndham National Hotel Portfolio Mortgage Loan (see Exhibit
34.4)

 34.24
Park Bridge Lender Services LLC, as Operating Advisor of the Wyndham National
Hotel Portfolio Mortgage Loan (Omitted. See Explanatory Notes.)

 34.25
 CoreLogic Solutions, LLC, as Servicing Function
Participant of the Wyndham National Hotel Portfolio Mortgage Loan

 34.26
as Servicing Function Participant for the Custodian (see Exhibit 34.7)

 34.27
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer of the Kings Plaza Mortgage Loan (Omitted. See Explanatory Notes.)

 34.28
Midland Loan Services, a Division of PNC Bank, National Association, as Special
Servicer of the Kings Plaza Mortgage Loan prior to April 27, 2023 (Omitted. See
Explanatory Notes.)

 34.29
K-Star Asset Management LLC, as Special Servicer of the Kings Plaza Mortgage
Loan on and after April 27, 2023 (Omitted. See Explanatory Notes.)

 34.30
Wells Fargo Bank, National Association, as Trustee of the Kings Plaza Mortgage
Loan (Omitted. See Explanatory Notes.)

 34.31
Custodian of the Kings Plaza Mortgage Loan (see Exhibit 34.4)

 34.32
the Kings Plaza Mortgage Loan (see Exhibit 34.5)

 34.33
as Servicing Function Participant for the Custodian (see Exhibit 34.7)

 34.34
of the MGM Grand & Mandalay Bay Mortgage Loan (see Exhibit 34.1)

 34.35
 Situs Holdings, LLC, as Special Servicer of the
MGM Grand & Mandalay Bay Mortgage Loan

 34.36
Wilmington Trust, National Association, as Trustee of the MGM Grand &
Mandalay Bay Mortgage Loan (Omitted. See Explanatory Notes.)

 34.37
 Citibank, N.A., as Custodian of the MGM Grand
& Mandalay Bay Mortgage Loan

 34.38
 U.S. Bank National Association, as Servicing
Function Participant of the MGM Grand & Mandalay Bay Mortgage Loan

Servicer compliance statements.

 35.1
 KeyBank National Association, as Master Servicer

 35.2

 35.3
Certificate Administrator

 35.4
as Servicing Function Participant for the Certificate Administrator

 35.5
of The Atlantic Mortgage Loan (see Exhibit 35.1)

 35.6
of The Atlantic Mortgage Loan (see Exhibit 35.2)

 35.7
 KeyBank National Association, as Primary Servicer of
the Morris Corporate Center Mortgage Loan (see Exhibit 35.1)

 35.8
of the Morris Corporate Center Mortgage Loan (see Exhibit 35.2)

 35.9
 Wells Fargo Bank, National Association, as Primary
Servicer of the Wyndham National Hotel Portfolio Mortgage Loan

 35.10
of the Wyndham National Hotel Portfolio Mortgage Loan (see Exhibit 35.2)

 35.11
Midland Loan Services, a Division of PNC Bank, National Association, as Primary
Servicer of the Kings Plaza Mortgage Loan (Omitted. See Explanatory
Notes.)

 35.12
Midland Loan Services, a Division of PNC Bank, National Association, as Special
Servicer of the Kings Plaza Mortgage Loan prior to April 27, 2023 (Omitted. See
Explanatory Notes.)

 35.13
K-Star Asset Management LLC, as Special Servicer of the Kings Plaza Mortgage
Loan on and after April 27, 2023 (Omitted. See Explanatory Notes.)

 35.14
of the MGM Grand & Mandalay Bay Mortgage Loan (see Exhibit 35.1)

 35.15
Situs Holdings, LLC, as Special Servicer of the MGM Grand & Mandalay Bay
Mortgage Loan (Omitted. See Explanatory Notes.)

 99.1
of June 25, 2021, among Barclays Capital Real Estate Inc., Barclays Capital Holdings
Inc. and Barclays Commercial Mortgage Securities LLC (filed as Exhibit 99.1 to
the registrant's Current Report on Form 8-K filed on July 15, 2021 under
Commission File No. 333-226850-09 and incorporated by reference herein).

 99.2
of June 25, 2021, among Societe Generale Financial Corporation, Soci t
G n rale and Barclays Commercial Mortgage Securities LLC (filed as Exhibit 99.2
to the registrant's Current Report on Form 8-K filed on July 15, 2021 under
Commission File No. 333-226850-09 and incorporated by reference herein).

 99.3
of June 25, 2021, between Starwood Mortgage Capital LLC and Barclays Commercial
Mortgage Securities LLC (filed as Exhibit 99.3 to the registrant's Current

 99.4
of June 25, 2021, between UBS AG, by and through its New York branch office at
1285 Avenue of the Americas, New York, New York and Barclays Commercial
Mortgage Securities LLC (filed as Exhibit 99.4 to the registrant's Current

 99.5
of June 25, 2021, between KeyBank National Association and Barclays Commercial
Mortgage Securities LLC (filed as Exhibit 99.5 to the registrant's Current

 (b) The exhibits required to be filed by the
Registrant pursuant to Item 601 of Regulation S-K are listed above.

 (c) Not Applicable.

 SIGNATURES

 Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.

 Barclays Commercial Mortgage
Securities LLC

(Depositor)

 /s/ Daniel
Vinson

 Daniel
Vinson, Chief Executive Officer

 (senior officer in charge of
securitization of the depositor)

 Date: March 14, 2024