UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 10, 2018

Citigroup Commercial Mortgage Trust 2013-GC15

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

(Central Index Key number of issuing entity: 0001585673)

Citigroup Commercial Mortgage Securities Inc.

(Exact name of depositor as specified in its charter)

(Central Index Key number of depositor: 0001258361)

Citigroup Global Markets Realty Corp.

(Central Index Key number: 0001541001)

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 names of sponsors as specified in their respective charters)

Depositor’s telephone number, including area code (212) 816-6000

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.45 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

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.  ☐

Item 6.02 – Change of Servicer or Trustee.

Pursuant to Section 6.08 of the Pooling and Servicing Agreement (the “PSA”) dated as of September 1, 2013 relating to the Citigroup Commercial Mortgage Trust 2013-GC15, Commercial Mortgage Pass Through Certificates, Series 2013-GC15, Waterfall Asset Management, LLC, in its capacity as Controlling Class Representative under the PSA, removed Midland Loan Services, a Division of PNC Bank, National Association (“Midland”), as special servicer under the PSA (other than with respect to the Walpole Whole Loan) and appointed LNR Partners, LLC as the replacement special servicer under the PSA (other than with respect to the Walpole Whole Loan). The removal of Midland as special servicer and appointment of LNR Partners, LLC as replacement special servicer (other than with respect to the Walpole Whole Loan) under the PSA is effective as of October 10, 2018, except as to the Mortgage Loan secured by the Mortgaged Property identified on Exhibit B to the PSA as City Centre Building as to which the effective date is December 30, 2018. A copy of the related Acknowledgement and Acceptance of Special Servicer dated October 10, 2018 is attached hereto as Exhibit 20.1.

Capitalized terms used but not defined herein shall have the meanings assigned to them in the PSA. A copy of the PSA was filed as Exhibit 4 to the Form 8-K filed by the issuing entity with the Securities and Exchange Commission on September 30, 2013 under Commission File No. 333-189017-01.

The Special Servicer

LNR Partners, LLC (“LNR Partners”), a Florida limited liability company and a subsidiary of Starwood Property Trust, Inc. (“STWD”), a Maryland corporation, has been appointed the special servicer (other than with respect to the Walpole Whole Loan) under the PSA as of October 10, 2018. The principal executive offices of LNR Partners are located at 1601 Washington Avenue, Suite 700, Miami Beach, Florida 33139 and its telephone number is (305) 695-5600. STWD through its subsidiaries, affiliates and joint ventures, is involved in the real estate finance, management and development business and engages in, among other activities:

STWD and its affiliates hold and manage over $13.0 billion of debt and equity commercial real estate investments.

LNR Partners and its affiliates have substantial experience in working out loans and in performing the other obligations of the special servicer as more particularly described in the PSA, including, but not limited to, processing borrower requests for lender consent to assumptions, leases, easements, partial releases and expansion and/or redevelopment of the mortgaged properties. LNR Partners and its affiliates have been engaged in the special servicing of commercial real estate assets for over 22 years. The number of commercial mortgage backed securitization pools specially serviced by LNR Partners and its affiliates has increased from 46 in December 1998 to 165 as of June 30, 2018.

More specifically, LNR Partners (and its predecessors in interest) acted as special servicer with respect to:

As of June 30, 2018, LNR Partners has resolved approximately $73.2 billion of U.S. commercial and multifamily loans over the past 22 years, including approximately $1.1 billion of U.S. commercial and multifamily mortgage loans during 2001, $1.9 billion of U.S. commercial and multifamily mortgage loans during 2002, $1.5 billion of U.S. commercial and multifamily mortgage loans during 2003, $2.1 billion of U.S. commercial and multifamily mortgage loans during 2004, $2.4 billion of U.S. commercial and multifamily mortgage loans during 2005, $0.9 billion of U.S. commercial and multifamily mortgage loans during 2006, $1.4 billion of U.S. commercial and multifamily mortgage loans during 2007, $1.0 billion of U.S. commercial and multifamily mortgage loans during 2008, $1.2 billion of U.S. commercial and multifamily mortgage loans during 2009, $7.7 billion of U.S. commercial and multifamily mortgage loans during 2010, $10.9 billion of U.S. commercial and multifamily mortgage loans during 2011, $11.7 billion of U.S. commercial and multifamily mortgage loans during 2012, $6.5 billion of U.S. commercial and multifamily mortgage loans during 2013, $6.3 billion of U.S. commercial and multifamily mortgage loans during 2014, approximately $6 billion of U.S. commercial and multifamily mortgage loans during 2015, approximately $3.9 billion of U.S. commercial and multifamily mortgage loans through December 31, 2016, $4.5 billion of U.S. commercial and multifamily mortgage loans through December 31, 2017, and approximately $1.55 billion of U.S. commercial and multifamily mortgage loans through June 30, 2018.

STWD or one of its affiliates generally seeks CMBS investments where it has the right to appoint LNR Partners as the special servicer. LNR Partners and its affiliates have regional offices located across the country in Florida, Georgia, Massachusetts, California, New York and North Carolina. As of June 30, 2018, LNR Partners and its affiliates specially service a portfolio, which included approximately 5,283 assets across the United States and various international properties with a then current face value of approximately $74.8 billion, all of which are commercial real estate assets. Those commercial real estate assets include mortgage loans secured by the same types of income producing properties as secure the mortgage loans backing the Certificates. Accordingly, the assets of LNR Partners and its affiliates may, depending upon the particular circumstances, including the nature and location of such assets, compete with the mortgaged real properties securing the underlying mortgage loans for tenants, purchasers, financing and so forth. LNR Partners does not service any assets other than commercial real estate assets.

LNR Partners maintains internal and external watch lists, corresponds with master servicers on a monthly basis and conducts overall deal surveillance and shadow servicing. LNR Partners has developed distinct strategies and procedures for working with borrowers on problem loans (caused by delinquencies, bankruptcies or other breaches of the loan documents) designed to maximize value from the assets for the benefit of the certificateholders. These strategies and procedures vary on a case by case basis, and include, but are not limited to, liquidation of the underlying collateral, note sales, discounted payoffs, and borrower negotiation or workout in accordance with the applicable servicing standard.

Generally, four basic factors are considered by LNR Partners as part of its analysis and determination of what strategies and procedures to utilize in connection with problem loans. They are (i) the condition and type of mortgaged property, (ii) the borrower, (iii) the jurisdiction in which the mortgaged property is located and (iv) the actual terms, conditions and provisions of the underlying loan documents. After each of these items is evaluated and considered, LNR Partners’ strategy is guided by the servicing standard and all relevant provisions of the applicable pooling and servicing agreement pertaining to specially serviced and REO mortgage loans.

LNR Partners has the highest ratings afforded to special servicers by S&P and is rated “CSS1-” by Fitch.

There have not been, during the past three years, any material changes to the policies or procedures of LNR Partners in the servicing function it will perform under the PSA for assets of the same type included in this securitization transaction. LNR Partners has not engaged, and currently does not have any plans to engage, any sub-servicers to perform on its behalf any of its duties with respect to this securitization transaction. LNR Partners does not believe that its financial condition will have any adverse effect on the performance of its duties under the PSA and, accordingly, will not have any material impact on the Mortgage Pool performance or the performance of the Certificates. Generally, LNR Partners’ servicing functions under pooling and servicing agreements do not include collection on the pool assets, however LNR Partners does maintain certain operating accounts with respect to REO mortgage loans in accordance with the terms of the applicable pooling and servicing agreements and consistent with the servicing standard set forth in each of such pooling and servicing agreements. LNR Partners does not have any material advancing obligations with respect to the commercial mortgage backed securitization pools as to which it acts as special servicer. Generally, LNR Partners has the right, but not the obligation, to make property related servicing advances in emergency situations with respect to commercial mortgage backed securitization pools as to which it acts as special servicer.

LNR Partners does not have primary responsibility for custody services of original documents evidencing the underlying mortgage loans. On occasion, LNR Partners may have custody of certain of such documents as necessary for enforcement actions involving particular mortgage loans or otherwise. To the extent that LNR Partners has custody of any such documents, such documents will be maintained in a manner consistent with the servicing standard under the PSA.

No securitization transaction involving commercial or multifamily mortgage loans in which LNR Partners was acting as special servicer has experienced an event of default as a result of any action or inaction by LNR Partners as special servicer. LNR Partners has not been terminated as servicer in a commercial mortgage loan securitization, either due to a servicing default or to application of a servicing performance test or trigger. In addition, there has been no previous disclosure of material noncompliance with servicing criteria by LNR Partners with respect to any other securitization transaction involving commercial or multifamily mortgage loans in which LNR Partners was acting as special servicer.

There are, to the actual current knowledge of LNR Partners, no special or unique factors of a material nature involved in special servicing the particular types of assets serviced under the PSA, as compared to the types of assets specially serviced by LNR Partners in other commercial mortgage backed securitization pools generally, for which LNR Partners has developed processes and procedures which materially differ from the processes and procedures employed by LNR Partners in connection with its special servicing of commercial mortgaged backed securitization pools generally.

There are currently no legal proceedings pending, and no legal proceedings known to be contemplated, by governmental authorities, against LNR Partners or of which any of its property is the subject, that are material to the holders of the Citigroup Commercial Mortgage Trust 2013-GC15, Commercial Mortgage Pass-Through Certificates, Series 2013-GC15 (the “Certificates”).

In the commercial mortgage backed securitizations in which LNR Partners acts as special servicer, LNR Partners may enter into one or more arrangements with any party entitled to appoint or remove and replace the special servicer to provide for a discount and/or revenue sharing with respect to certain of the special servicer compensation in consideration of, among other things, LNR Partners’ appointment as special servicer under the applicable servicing agreement and limitations on such person’s right to replace LNR Partners as the special servicer.

LNR Partners is not an affiliate of the depositor, the underwriters, the issuing entity, the master servicer, the trustee, the certificate administrator, the operating advisor, the asset representations reviewer, any sponsor or any originator, other than Starwood Mortgage Capital LLC (“SMC”), an originator and Starwood Mortgage Funding I LLC (“SMF”), a sponsor. LNR Partners is an affiliate of LNR Securities Holdings, LLC (“LNRSH”) which currently holds a minority portion of the Class F Certificates and a minority portion of the Class G Certificates.

Except for LNR Partners acting as special servicer and the portion of Certificates held by LNRSH as described in the preceding paragraph, there are no specific relationships that are material involving or relating to this securitization transaction or the Mortgage Loans between LNR Partners or any of its affiliates, on the one hand, and the issuing entity, the sponsors (other than SMF), the trustee, the certificate administrator, any originator (other than SMC), any significant obligor, the master servicer, the operating advisor or the asset representations reviewer, on the other hand, that currently exist or that existed during the past two years. In addition, there are no business relationships, agreements, arrangements, transactions or understandings that have been entered into outside the ordinary course of business or on terms other than would be obtained in an arm’s length transaction with an unrelated third party – apart from this securitization transaction – between LNR Partners or any of its affiliates, on the one hand, and the issuing entity, the sponsors, the trustee, the certificate administrator, any originator, any significant obligor, the master servicer, the operating advisor or the asset representations reviewer, on the other hand, that currently exist or that existed during the past two years and that are material to an investor’s understanding of the Certificates.

As of the date of its appointment as Special Servicer, except for fees and additional special servicing compensation under the PSA, neither LNR Partners nor any of its affiliates retain any economic interest in this securitization, including without limitation any Certificates issued by the issuing entity, except for the ownership of certain Certificates by LNRSH, as described above. However, each of LNR Partners and its affiliates will be entitled at their discretion to acquire certificates issued by the issuing entity, and in each such case will have the right to dispose of any such certificates at any time.

The information above set forth under this heading “The Special Servicer” has been provided by LNR Partners.

Item 9.01 – Financial Statements and Exhibits

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.