UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ 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

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

For the transition period from to

333-189017-01

(Commission File Number of issuing entity)

0001585673

(Central Index Key Number of issuing entity)

Citigroup Commercial Mortgage Trust 2013-GC15

(Exact name of issuing entity as specified in its charter)

333-189017

(Commission File Number of depositor)

0001258361

(Central Index Key Number of depositor)

Citigroup Commercial Mortgage Securities Inc.

(Exact name of depositor as specified in its charter)

Citigroup Global Markets Realty Corp.

(Central Index Key Number: 0001541001)

LMF Commercial, LLC (f/k/a Rialto Mortgage Finance, LLC)

(Central Index Key Number: 0001592182)

Goldman Sachs Mortgage Company

(Central Index Key Number: 0001541502)

Starwood Mortgage Funding I LLC

(Central Index Key Number: 0001682511)

RAIT Funding, LLC

(Central Index Key Number: 0001587045)

Redwood Commercial Mortgage Corporation

(Central Index Key Number: 0001567746)

The Bancorp Bank

(Central Index Key Number: 0001505494)

(Exact name of sponsor as specified in its charter)

46-7036489

46-7039598

New York	46-7042172
(State or other jurisdiction of organization of the issuing entity)	(I.R.S. Employer Identification No.)

c/o Citibank, N.A.

388 Greenwich Street Trading, 4th Floor

New York, New York 10013

(Address of principal executive offices of issuing entity)

(212) 816-5614

Registrant’s telephone number, including area code

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. ☐ 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. ☐ 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 ☐ 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 (§ 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	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☐
		Emerging growth company	☐

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. ☐

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. 

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). ☐ 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.

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

1 Effective as of December 5, 2022, U.S. Bank Trust Company, National Association succeeded to all of the rights of U.S. Bank National Association under the CGCMT 2013-GC15 PSA, and U.S. Bank Trust Company, National Association has assumed all of the duties and responsibilities of U.S. Bank National Association as trustee under the CGCMT 2013-GC15 PSA, as disclosed in the Current Report on Form 8-K dated December 5, 2022 and filed by the registrant under Commission File No. 333-189017-01.

2 Effective as of October 10, 2018 (except with respect to the City Centre Building mortgage loan as to which the effective date was December 30, 2018), the controlling class representative under the CGCMT 2013-GC15 PSA removed Midland Loan Services, a Division of PNC Bank, National Association as special servicer under the CGCMT 2013-GC15 PSA (other than with respect to the Walpole Whole Loan (as such term is defined in the CGCMT 2013-GC15 PSA), which represented approximately 1.6% of the initial pool balance of the issuing entity) and appointed LNR Partners, LLC as the replacement special servicer under the CGCMT 2013-GC15 PSA (other than with respect to the Walpole Whole Loan), as disclosed in the current report on Form 8-K filed by the Registrant on October 16, 2018 under Commission File No. 333-189017-01.

3 Pursuant to Instruction 3 to Item 1122 of Regulation AB, the report on assessment of compliance with servicing criteria and attestation report on assessment of compliance with servicing criteria of Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the Walpole Whole Loan (as such term is defined in the CGCMT 2013-GC15 PSA) is not included in this report on Form 10-K because Midland Loan Services, a Division of PNC Bank, National Association performed activities that address the servicing criteria specified in Item 1122(d) of Regulation AB with respect to 5% or less of the pool assets of the issuing entity.

PART I

Item 1. Business.

Omitted.

Item 1A. Risk Factors.

Omitted.

Item 1B. Unresolved Staff Comments.

None.

Item 1C. Cybersecurity.

Omitted.

Item 2. Properties.

Omitted.

Item 3. Legal Proceedings.

Omitted.

3

Item 4. Mine Safety Disclosures.

Not applicable.

PART II

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

Omitted.

Item 6. [Reserved]

Omitted.

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

Omitted.

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

Omitted.

Item 8. Financial Statements and Supplementary Data.

Omitted.

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

Omitted.

Item 9A. Controls and Procedures.

Omitted.

Item 9B. Other Information.

None.

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

Not Applicable.

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Omitted.

Item 11. Executive Compensation.

Omitted.

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

Omitted.

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

Omitted.

4

Item 14. Principal Accountant Fees and Services.

Omitted.

ADDITIONAL DISCLOSURE ITEMS REQUIRED BY GENERAL INSTRUCTION J(2)

Item 1112(b) of Regulation AB

No mortgage loan in the pool assets for Citigroup Commercial Mortgage Trust 2013-GC15 constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB.

Item 1114(b)(2) and Item 1115(b) of Regulation AB

No entity or group of affiliated entities provides any external credit enhancement, uses any derivative instruments or other support for the certificates within this transaction.

Item 1117 of Regulation AB

Disclosure from U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as Trustee:

U.S. Bank National Association (“U.S. Bank”) and other large financial institutions have been sued in their capacity as trustee or successor trustee for certain residential mortgage backed securities ("RMBS") trusts. The complaints, primarily filed by investors or investor groups against U.S. Bank and similar institutions, allege the trustees caused losses to investors as a result of alleged failures by the sponsors, mortgage loan sellers and servicers to comply with the governing agreements for these RMBS trusts. Plaintiffs generally assert causes of action based upon the trustees’ purported failures to enforce repurchase obligations of mortgage loan sellers for alleged breaches of representations and warranties, notify securityholders of purported events of default allegedly caused by breaches of servicing standards by mortgage loan servicers and abide by a heightened standard of care following alleged events of default.

U.S. Bank denies liability and believes that it has performed its obligations under the RMBS trusts in good faith, that its actions were not the cause of losses to investors, that it has meritorious defenses, and it has contested and intends to continue contesting the plaintiffs’ claims vigorously. However, U.S. Bank cannot assure you as to the outcome of any of the litigation, or the possible impact of these litigations on the trustee or the RMBS trusts.

On March 9, 2018, a law firm purporting to represent fifteen Delaware statutory trusts (the “DSTs”) that issued securities backed by student loans (the “Student Loans”) filed a lawsuit in the Delaware Court of Chancery against U.S. Bank National Association (“U.S. Bank”) in its capacities as indenture trustee and successor special servicer, and three other institutions in their respective transaction capacities, with respect to the DSTs and the Student Loans. This lawsuit is captioned The National Collegiate Student Loan Master Trust I, et al. v. U.S. Bank National Association, et al., C.A. No. 2018-0167-JRS (Del. Ch.) (the “NCMSLT Action”). The complaint, as amended on June 15, 2018, alleged that the DSTs have been harmed as a result of purported misconduct or omissions by the defendants concerning administration of the trusts and special servicing of the Student Loans. Since the filing of the NCMSLT Action, certain Student Loan borrowers have made assertions against U.S. Bank concerning special servicing that appear to be based on certain allegations made on behalf of the DSTs in the NCMSLT Action.

U.S. Bank has filed a motion seeking dismissal of the operative complaint in its entirety with prejudice pursuant to Chancery Court Rules 12(b)(1) and 12(b)(6) or, in the alternative, a stay of the case while other prior filed disputes involving the DSTs and the Student Loans are litigated. On November 7, 2018, the Court ruled that the case should be stayed in its entirety pending resolution of the first-filed cases. On January 21, 2020, the Court entered an order consolidating for pretrial purposes the NCMSLT Action and three other lawsuits pending in the Delaware Court of Chancery concerning the DSTs and the Student Loans, which remains pending.

U.S. Bank denies liability in the NCMSLT Action and believes it has performed its obligations as indenture trustee and special servicer in good faith and in compliance in all material respects with the terms of the agreements governing the DSTs and that it has meritorious defenses. It has contested and intends to continue contesting the plaintiffs’ claims vigorously.

Item 1119 of Regulation AB

Provided previously in (i) the prospectus supplement of the Registrant relating to the issuing entity and filed on September 26, 2013 pursuant to Rule 424(b)(5) of the Securities Act of 1933, as amended and (ii) the current report on Form 8-K filed by the Registrant on October 16, 2018 under Commission File No. 333-189017-01.

5

Item 1122 of Regulation AB

The reports on assessment of compliance with servicing criteria for asset-backed securities and related attestation reports are attached hereto under Item 15.

Item 1123 of Regulation AB

The servicer compliance statements are attached hereto under Item 15.

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a)List the following documents filed as a part of the report:

(1)Not Applicable

(2)Not Applicable

(3)Exhibits listed below are either included or incorporated by reference as indicated below:

Exhibit Number	Description
4	Pooling and Servicing Agreement, dated as of September 1, 2013 (the “CGCMT 2013-GC15 PSA”), between Citigroup Commercial Mortgage Securities Inc., as depositor, Wells Fargo Bank, National Association, as master servicer, LNR Partners, LLC (as successor to Midland Loan Services, a Division of PNC Bank, National Association), as special servicer, Situs Holdings, LLC, as operating advisor, Citibank, N.A., as certificate administrator, and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as trustee (filed as Exhibit 4 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein). (see Explanatory Note #1)
10.1	Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between Citigroup Global Markets Realty Corp. and Citigroup Commercial Mortgage Securities Inc., pursuant to which Citigroup Global Markets Realty Corp. sold certain mortgage loans to the depositor (filed as Exhibit 10.1 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).
10.2	Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between LMF Commercial, LLC (f/k/a Rialto Mortgage Finance, LLC) and Citigroup Commercial Mortgage Securities Inc., pursuant to which LMF Commercial, LLC (f/k/a Rialto Mortgage Finance, LLC) sold certain mortgage loans to the depositor (filed as Exhibit 10.2 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).
10.3	Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between Goldman Sachs Mortgage Company and Citigroup Commercial Mortgage Securities Inc., pursuant to which Goldman Sachs Mortgage Company sold certain mortgage loans to the depositor (filed as Exhibit 10.3 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).
10.4	Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between Starwood Mortgage Funding I LLC and Citigroup Commercial Mortgage Securities Inc., pursuant to which Starwood Mortgage Funding I LLC sold certain mortgage loans to the depositor (filed as Exhibit 10.4 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).
10.5	Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between RAIT Funding, LLC and Citigroup Commercial Mortgage Securities Inc., pursuant to which RAIT Funding, LLC sold certain mortgage loans to the depositor (filed as Exhibit 10.5 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).

6

10.6

Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between Redwood Commercial Mortgage Corporation and Citigroup Commercial Mortgage Securities Inc., pursuant to which Redwood Commercial Mortgage Corporation sold certain mortgage loans to the depositor (filed as Exhibit 10.6 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).

10.7

Mortgage Loan Purchase Agreement, dated as of September 1, 2013, between The Bancorp Bank and Citigroup Commercial Mortgage Securities Inc., pursuant to which The Bancorp Bank sold certain mortgage loans to the depositor (filed as Exhibit 10.7 to the registrant’s Current Report on Form 8-K dated September 30, 2013, and filed by the registrant on September 30, 2013 under Commission File No. 333-189017-01, and is incorporated by reference herein).

31	Rule 15d-14(d) Certification
33	Reports on assessment of compliance with servicing criteria for asset-backed securities. (see Explanatory Note #2)
33.1	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as master servicer
33.2	Report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer
33.3	Report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor
33.4	Report on assessment of compliance with servicing criteria for asset-backed securities, Citibank, N.A., as certificate administrator
33.5	Report on assessment of compliance with servicing criteria for asset-backed securities, CoreLogic Solutions, LLC, as servicing function participant
33.6	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian
33.7	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as trustee
34	Attestation reports on assessment of compliance with servicing criteria for asset-backed securities.
34.1	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as master servicer
34.2	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer
34.3	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor
34.4	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Citibank, N.A., as certificate administrator
34.5	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, CoreLogic Solutions, LLC, as servicing function participant
34.6	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian

7

34.7 Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as trustee

35 Servicer compliance statements.

35.1	Servicer compliance statement, Wells Fargo Bank, National Association, as master servicer
35.2	Servicer compliance statement LNR Partners, LLC, as special servicer
35.3	Servicer compliance statement, Citibank, N.A., as certificate administrator

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

(c)Not Applicable

8

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.

Date: March 29, 2024

Citigroup Commercial Mortgage Securities Inc.

(Depositor)

/s/ Richard Simpson

Richard Simpson, President

9