UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(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

oTRANSITION 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: 333-207340-06

Central Index Key Number of the issuing entity: 0001720748

CCUBS Commercial Mortgage Trust 2017-C1

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

Central Index Key Number of the depositor: 0001532799

UBS Commercial Mortgage Securitization Corp.

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

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

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

Central Index Key Number of the sponsor: 0001558761

Cantor Commercial Real Estate Lending, L.P.

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

Central Index Key Number of the sponsor: 0001701238

Citi Real Estate Funding Inc.

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

New York
(State or other jurisdiction of
incorporation or organization of the issuing entity) 38-4052506 38-4052507 (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) 713-2000

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 oNo

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).

Not applicable.

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.

Not applicable.

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 oNo

Not applicable.

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

Not applicable.

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).

Not applicable.

EXPLANATORY NOTES

The sole purpose of this Amendment No. 1 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the Securities and Exchange Commission on March 21, 2024 is to file an updated attestation report on assessment of compliance with servicing criteria for Green Loan Services LLC to correct a typographic error identifying the appendix that lists the transactions covered by the attestation report.

Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Form 10-K/A also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto.

PART IV

Item 15. Exhibit and Financial Statement Schedules

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

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

34.46       Green Loan Services LLC, as Special Servicer of the General Motors Building Mortgage Loan

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.

UBS Commercial Mortgage Securitization Corp.
(Depositor)

/s/ Nicholas Galeone

Nicholas Galeone, President

(senior officer in charge of securitization of the depositor)

Date: April 8, 2024

/s/ Andrew Lisa

Andrew Lisa, Director

Date: April 8, 2024