UNITED STATESSECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

(Mark One)

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

For the fiscal year ended December 31, 2018or

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: 333-206987-01

Central Index Key Number of the issuing entity: 0001696707

BBCMS Mortgage Trust 2017-C1

(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: 0000312070

Barclays Bank PLC

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



Central Index Key Number of the sponsor: 0001685185

UBS AG

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



Central Index Key Number of the sponsor: 0001592182

Rialto Mortgage Finance, LLC

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



New York(State or other jurisdiction ofincorporation or organization
of

   the issuing entity)

   38-4021813

   38-4021814

   38-7170519

   (I.R.S. Employer

   Identification Numbers)


c/o 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:  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.oYes⌧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.oYes⌧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.⌧YesoNo

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required
to be submitted and posted 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 and post such files).

Not applicable.

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein, and
will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.

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 fileroAccelerated filero

Non-accelerated filer⌧(Do not check if a smaller reporting company)                        Smaller
reporting companyo

Emerging growth companyo

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 is a shell company (as defined in Rule 12b-2 of the Act).oYes⌧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.oYesoNo

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.




The sole purpose of this Amendment No. 1 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2018 filed with the Securities and Exchange
Commission on March 20, 2019 (the “Original Form 10-K”) is to replace the report on assessment
of compliance and the accountants’ attestation report of Rialto Capital Advisors, LLC filed as exhibits to the Original Form 10-K under Exhibit 33 and Exhibit 34, respectively, with the corresponding exhibits attached hereto.  Except as
described above, no other changes are being made to the Original Form 10-K.

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. Exhibits, Financial Statement Schedules

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

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



33.2
Rialto Capital Advisors, LLC, as Special Servicer



33.10
Rialto Capital Advisors, LLC, as Special Servicer of the 1166 Avenue of the Americas Mortgage Loan (see Exhibit 33.2)



33.18
Rialto Capital Advisors, LLC, as Special Servicer of the Merrill Lynch Drive Mortgage Loan (see Exhibit 33.2)



33.26
Rialto Capital Advisors, LLC, as Special Servicer of the KOMO Plaza Mortgage Loan (see Exhibit 33.2)



33.34
Rialto Capital Advisors, LLC, as Special Servicer of the Anaheim Marriot Suites Mortgage Loan (see Exhibit 33.2)



33.42
Rialto Capital Advisors, LLC, as Special Servicer of the Wolfchase Galleria Mortgage Loan (see Exhibit 33.2)

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



34.2
Rialto Capital Advisors, LLC, as Special Servicer

34.10
Rialto Capital Advisors, LLC, as Special Servicer of the 1166 Avenue of the Americas Mortgage Loan (see Exhibit 34.2)

34.18
Rialto Capital Advisors, LLC, as Special Servicer of the Merrill Lynch Drive Mortgage Loan (see Exhibit 34.2)

34.26
Rialto Capital Advisors, LLC, as Special Servicer of the KOMO Plaza Mortgage Loan (see Exhibit 34.2)

34.34
Rialto Capital Advisors, LLC, as Special Servicer of the Anaheim Marriot Suites Mortgage Loan (see Exhibit 34.2)

34.42
Rialto Capital Advisors, LLC, as Special Servicer of the Wolfchase Galleria Mortgage Loan (see Exhibit 34.2)





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: October 30, 2019