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, ~~2024~~2025


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

For the transition period from to

333-189017-09

(Commission File Number of issuing entity)

0001643661

(Central Index Key Number of issuing entity)

Citigroup Commercial Mortgage Trust 2015-GC31

(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)

Goldman Sachs Mortgage Company

(Central Index Key Number: 0001541502)

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

(Central Index Key Number: 0001592182)

RAIT Funding, LLC

(Central Index Key Number: 0001587045)

KGS-Alpha Real Estate Capital Markets, LLC

(Central Index Key Number: 0001765483)

(Exact name of sponsor as specified in its charter)

     (State or other jurisdiction of
organization of the issuing entity)

     (I.R.S. Employer
Identification No.)

c/o Citibank, N.A.

388 Greenwich Street, 26th Floor

New York, New York 10013

(Address of principal executive offices of issuing entity)

(212) 816-4936

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 The Dallas Market Center mortgage loan, which represented approximately 9.9% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and two pari passu companion loans that are held outside the issuing entity. The Dallas Market Center mortgage loan and the related companion loans are serviced pursuant to the GSMS 2015-GC30 PSA. Effective as of ~~October~~March 71, ~~2022~~2025, ~~Midland~~Trimont ~~Loan~~LLC ~~Services,~~succeeded ato ~~Division~~Wells ofFargo ~~PNC~~ Bank, National Association ~~was terminated as the special servicer under the GSMS 2015-GC30 PSA and LNR Partners~~, ~~LLC has been appointed to act~~ as ~~successor~~master ~~special~~ servicer under the ~~GSMS~~CGCMT 2015-~~GC30~~GC31 PSA, as disclosed in the Current Report on Form 8-K filed by the registrant on ~~October~~March 73, ~~2022~~2025 under Commission File No. 333-189017-09. Effective as of December 14, 2022, Trimont Real Estate Advisors, LLC resigned as operating advisor under the GSMS 2015-GC30 PSA and BellOak, LLC has been appointed to act as successor operating advisor under the GSMS 2015-GC30 PSA.

2 The ~~Crowne~~Dallas ~~Plaza~~Market ~~Bloomington~~Center mortgage loan, which represented approximately 19.79% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and ~~one~~two pari passu companion ~~loan~~loans that isare held outside the issuing entity. The ~~Selig~~Dallas ~~Office~~Market ~~Portfolio~~Center mortgage loan, ~~which~~and ~~represented~~the ~~approximately~~related 9companion loans are serviced pursuant to the GSMS 2015-GC30 PSA.~~95%~~ Effective as of ~~the~~October ~~initial~~7, ~~pool~~2022, ~~balance~~Midland Loan Services, a Division of PNC Bank, National Association was terminated as the ~~issuing~~special ~~entity~~servicer under the GSMS 2015-GC30 PSA and LNR Partners, isLLC ~~part~~has ofbeen aappointed ~~loan~~to ~~combination~~act ~~comprised~~as ofsuccessor special servicer under the ~~subject~~GSMS ~~mortgage~~2015-GC30 ~~loan~~PSA, ~~included~~as disclosed in the ~~issuing~~Current ~~entity~~Report on Form 8-K filed by the registrant on October 7, 2022 under Commission File No. 333-189017-09. Effective as of December 14, 2022, Trimont Real Estate Advisors, LLC resigned as operating advisor under the GSMS 2015-GC30 PSA and ~~three~~BellOak, ~~pari~~LLC ~~passu~~has ~~companion~~been ~~loans~~appointed ~~that~~to ~~are~~act ~~held~~as ~~outside~~successor operating advisor under the ~~issuing~~GSMS ~~entity~~2015-GC30 PSA. ~~The~~Effective ~~Crowne~~as ~~Plaza~~of ~~Bloomington~~October ~~mortgage~~17, ~~loan~~2022, U.S. Bank Trust Company, National Association succeeded to all of the ~~Selig~~rights ~~Office~~of ~~Portfolio~~U.S. ~~mortgage~~Bank ~~loan~~National Association as trustee and ~~each~~certificate administrator under the GSMS 2015-GC30 PSA, and U.S. Bank Trust Company, National Association has assumed all of the ~~related~~duties ~~companion~~and ~~loans~~responsibilities ~~are~~of ~~serviced~~U.S. ~~pursuant~~Bank toNational Association as trustee and certificate administrator under the ~~CGCMT~~GSMS 2015-~~GC29~~GC30 PSA.

3 ~~This~~The ~~annual~~Selig ~~report~~Office onPortfolio ~~Form~~mortgage ~~10-K~~loan, ~~does~~which ~~not~~represented ~~include~~approximately 9.95% of the ~~reports~~initial onpool ~~assessment~~balance of ~~compliance~~the ~~with~~issuing ~~servicing~~entity, ~~criteria~~is ~~and~~part ~~attestation~~of ~~reports~~a onloan ~~assessment~~combination comprised of ~~compliance~~the ~~with~~subject ~~servicing~~mortgage ~~criteria~~loan ofincluded ~~(i)~~in ~~U.S.~~the ~~Bank~~issuing ~~National~~entity ~~Association,~~and asthree ~~certificate~~pari ~~administrator~~passu ~~under~~companion loans that are held outside the ~~GSMS~~issuing ~~2015-GC30PSA~~entity. The Selig Office Portfolio mortgage loan and ~~(ii)~~each ~~Citibank,~~of ~~N.A.,~~the asrelated ~~certificate~~companion ~~administrator~~loans ~~under~~are serviced pursuant to the CGCMT 2015-GC29 PSA. The Crowne Plaza Bloomington mortgage loan, ~~because~~previously ~~the~~an ~~certificate~~asset ~~administrator~~of ~~under~~the ~~each~~issuing ~~such~~entity ~~pooling~~being ~~and~~serviced ~~servicing~~under ~~agreement~~the ~~does~~CGCMT ~~not~~2015-GC29 ~~perform~~PSA, ~~any~~was ~~activities~~not ~~that~~an ~~address~~asset of the ~~servicing~~issuing ~~criteria~~entity ~~specified~~during inthe ~~Item~~reporting ~~1122(d)~~period ofand ~~Regulation~~is ABomitted ~~with~~from ~~respect~~this toannual ~~the~~report ~~issuing~~on ~~entity.~~Form 10-K.

4 This annual report on Form 10-K does not include the ~~servicer~~reports ~~compliance~~on ~~statement~~assessment of ~~LNR~~compliance ~~Partners,~~with ~~LLC~~servicing ascriteria ~~special~~and ~~servicer~~attestation ~~under~~reports ~~the~~on ~~GSMS~~assessment ~~2015-GC30 PSA pursuant to which the Dallas Market Center mortgage loan is serviced, because LNR Partners, LLC is an unaffiliated party that services less than 10%~~ of ~~the~~compliance ~~pool~~with ~~assets~~servicing ~~of the issuing entity, and therefore is not a “servicer” that meets the~~ criteria inof ~~Item 1108~~(~~a)(2)(~~i) ~~through (iii) of Regulation AB~~U.S. ~~This~~Bank ~~annual~~Trust ~~report~~Company, onNational ~~Form~~Association ~~10-K~~(as ~~does~~successor ~~not~~to ~~include the servicer compliance statements of (i)~~ U.S. Bank National Association), as certificate administrator under the GSMS 2015-GC30 PSA and (ii) Citibank, N.A., as certificate administrator under the CGCMT 2015-GC29 PSA, because the certificate administrator under each such pooling and servicing isagreement does not aperform ~~“servicer”~~any activities that ~~meets~~address the servicing criteria specified in Item ~~1108~~1122(ad)~~(2)(i)~~ ~~through (iii)~~ of Regulation AB with respect to the issuing entity.

5 This annual report on Form 10-K does not include the servicer compliance statement of LNR Partners, LLC as special servicer under the GSMS 2015-GC30 PSA pursuant to which the Dallas Market Center mortgage loan is serviced, because LNR Partners, LLC is an unaffiliated party that services less than 10% of the pool assets of the issuing entity, and therefore is not a “servicer” that meets the criteria in Item 1108(a)(2)(i) through (iii) of Regulation AB. This annual report on Form 10-K does not include the servicer compliance statements of (i) U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as certificate administrator under the GSMS 2015-GC30 PSA and (ii) Citibank, N.A., as certificate administrator under the CGCMT 2015-GC29 PSA, because the certificate administrator under each such pooling and servicing is not a “servicer” that meets the criteria in Item 1108(a)(2)(i) through (iii) of Regulation AB with respect to 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.

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.

Item 14. Principal Accountant Fees and Services.

Omitted.

ADDITIONAL DISCLOSURE ITEMS REQUIRED BY GENERAL INSTRUCTION J(2)

Item 1112(b) of Regulation AB

The property securing the 135 South LaSalle mortgage loan constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB and as disclosed in the prospectus supplement for Citigroup Commercial Mortgage Trust 2015-GC31 filed on July 8, 2015. With respect to the property securing the 135 South LaSalle mortgage loan, the most recent unaudited net operating income was ($(6,284,~~037~~753.5464) from January 1, ~~2024~~2025 through December 31, ~~2024~~2025.

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 Deutsche Bank Trust Company Americas (“DBTCA”), (i) as Trustee and Custodian and (ii) as trustee and custodian for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA:

In 2014 and 2015, several investors sued several trustees of residential mortgage-backed securities (“RMBS”) trusts, including DBTCA, concerning the trustees’ administration of RMBS trusts. These cases generally alleged that the RMBS trustees failed to perform purported duties, as trustees for private-label RMBS trusts, to enforce breaches of representations and warranties as to mortgage loans held by the trusts and to enforce breaches by servicers of their mortgage loan servicing obligations for the trusts. Investors have sued DBTCA in six of these cases. DBTCA has settled two cases brought by funds managed by Blackrock Advisors, LLC, PIMCO-Advisors, L.P. and others; and obtained summary judgment in one case, brought by certain special purpose entities including Phoenix Light SF Limited. In addition, the two cases described below remain active.

On November 30, 2017, DBTCA was added as a defendant to a case brought by Commerzbank AG (“Commerzbank”) in the U.S. District Court for the Southern District of New York, in which Commerzbank previously alleged incorrectly that Deutsche Bank National Trust Company (“DBNTC”) served as trustee for all 50 of the trusts at issue. On November 30, 2017, Commerzbank filed a second amended complaint that names DBTCA as a defendant in addition to DBNTC. DBTCA serves as trustee for 1 of the 50 trusts at issue. DBNTC serves as trustee for the other 49 trusts at issue. Commerzbank’s second amended complaint brings claims for violation of the U.S. Trust Indenture Act of 1939 (“TIA”); breach of contract; breach of fiduciary duty; negligence; violation of the New York Streit Act (“Streit Act”); and breach of the covenant of good faith. However, in the second amended complaint, Commerzbank acknowledges that, before DBTCA was added to the case, the court dismissed Commerzbank’s TIA claims for the trusts governed by pooling and servicing agreements, as well as its Streit Act claims and claims for breach of the covenant of good faith, and Commerzbank only includes these claims to preserve any rights on appeal. The second amended complaint alleges that DBNTC and DBTCA caused Commerzbank to suffer “hundreds of millions of dollars in losses,” but the complaint does not include a demand for money damages in a sum certain. On January 29, 2018, DBNTC and DBTCA filed an answer to the second amended complaint. On December 7, 2018, DBNTC and DBTCA filed a motion for summary judgment. Also on December 7, 2018, Commerzbank, jointly with the Phoenix Light plaintiffs, filed a motion for partial summary judgment. On February 8, 2022, the court issued an order in which it granted in part DBNTC and DBTCA’s motion for summary judgment and denied plaintiffs’ motion for partial summary judgment. As a result of that order, many of plaintiffs’ claims and theories were dismissed with prejudice. The operative scheduling order contemplates that a second phase of summary judgment briefing will be completed by January 23, 2025.

~~On December 30~~order, ~~2015,~~many ~~IKB~~of ~~International,~~plaintiffs’ ~~S.A.~~claims ~~in Liquidation~~ and ~~IKB~~theories ~~Deutsche~~were ~~Industriebank~~dismissed ~~A.G. (collectively, “IKB”), as an investor in 37 RMBS trusts, filed a summons~~ with ~~notice in the Supreme Court of the State of New York, New York County, against DBNTC and DBTCA as trustees of the trusts~~prejudice. On ~~May~~September 2726, ~~2016~~2024, IKB served its complaint asserting claims for breach of contract, breach of fiduciary duty, breach of duty to avoid conflicts of interest, violation of the Streit Act, violation of the TIA, violation of Regulation AB, and violation of Section 9 of the Uniform Commercial Code. IKB alleges that DBNTC and DBTCA ~~are~~filed ~~liable~~a motion for ~~over~~summary ~~U.S. $268 million in damages. On October 5~~judgment, ~~2016,~~which ~~DBNTC~~has ~~and~~been ~~DBTCA,~~fully ~~together with several other trustees defending lawsuits by IKB, filed a~~ briefed.

On December 30, 2015, IKB International, S.A. in Liquidation and IKB Deutsche Industriebank A.G. (collectively, “IKB”), as an investor in 37 RMBS trusts, filed a summons with notice in the Supreme Court of the State of New York, New York County, against DBNTC and DBTCA as trustees of the trusts. On May 27, 2016, IKB served its complaint asserting claims for breach of contract, breach of fiduciary duty, breach of duty to avoid conflicts of interest, violation of the Streit Act, violation of the TIA, violation of Regulation AB, and violation of Section 9 of the Uniform Commercial Code. IKB alleges that DBNTC and DBTCA are liable for over U.S. $268 million in damages. On October 5, 2016, DBNTC and DBTCA, together with several other trustees defending lawsuits by IKB, filed a joint motion to dismiss. On January 6, 2017, IKB filed a notice of discontinuance, voluntarily dismissing with prejudice all claims as to three trusts. On June 20, 2017, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to four additional trusts. On January 27, 2021, the court granted in part and denied in part DBNTC and DBTCA’s motion to dismiss. The court granted the motion to dismiss with respect to IKB’s claims for violations of the Streit Act, Regulation AB, and Section 9 of the Uniform Commercial Code, as well as certain aspects of IKB’s claims for breach of contract, breach of fiduciary duty, and violation of the TIA. The court denied the remainder of the motion to dismiss. IKB’s remaining claims for breach of contract, breach of fiduciary duty, breach of duty to avoid conflicts of interest, and violation of the TIA will proceed. On May 10, 2021, DBNTC and DBTCA filed a notice of appeal with the New York Supreme Court Appellate Division, First Department, regarding certain aspects of the court’s order on the motion to dismiss. On May 20, 2021, IKB filed a notice of cross appeal with respect to other aspects of that order. On August 30, 2022, the New York Supreme Court, Appellate Division, First Department affirmed in part and reversed in part the court’s order on the motion to dismiss. After DBNTC and DBTCA appealed the First Department’s decision, on June 15, 2023, the New York Court of Appeals reversed the First Department’s decision in part, dismissing certain additional contract claims, as well as IKB’s claims for breach of fiduciary duty and breach of duty to avoid conflicts of interest. On June 2, 2021, IKB filed a motion for re-argument regarding certain aspects of the court’s order on the motion to dismiss, which the court denied on August 3, 2021. On May 13, 2021, DBNTC and DBTCA filed an answer to the complaint. On October 28, 2021, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to seven additional trusts. On December 29, 2021, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to one additional trust. On April 22, 2022, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to 17 certificates at issue, including all claims as to 5 trusts. On February 28, 2023, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to two trusts, leaving 15 trusts at issue. On November 21, 2023, the parties filed a stipulation, voluntarily dismissing with prejudice all claims as to three trusts, leaving 12 trusts at issue. On November 14, 2024, DBNTC and DBTCA filed a motion for summary judgment. Also on November 14, 2024, IKB filed a motion for partial summary judgment. ~~Those~~On August 11, 2025, the court granted in part and denied in part certain aspects of both motions. On ~~are~~October ~~being~~20, ~~briefed~~2025, the court resolved the remainder of both motions and dismissed certain additional claims. All parties have filed notices of appeal with respect to certain aspects of the court’s summary judgment orders.

It is DBTCA’s belief that it has no pending legal proceedings (including, based on DBTCA’s ~~present~~current evaluation, the litigation disclosed in the foregoing paragraphs) that would materially affect its ability to perform its duties under the Pooling and Servicing Agreement for this transaction.

Item 1119 of Regulation AB

Provided previously in the prospectus supplement of the Registrant relating to the issuing entity and filed on July 8, 2015 pursuant to Rule 424(b)(5) of the Securities Act of 1933, as amended.

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:

ExhibitNumber	Description
4.1	Pooling and Servicing Agreement, dated as of July 1, 2015 (the “CGCMT 2015-GC31 PSA”), by and among Citigroup Commercial Mortgage Securities, Inc., as depositor, Trimont LLC (as successor to Wells Fargo Bank, National Association), as master servicer, Torchlight Loan Services, LLC, as special servicer, Pentalpha Surveillance LLC, as operating advisor, Citibank, N.A., as certificate administrator, and Deutsche Bank Trust Company Americas, as trustee (filed as Exhibit 4.1 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein). (see Explanatory Note #1)
4.2	Pooling and Servicing Agreement, dated as of May 1, 2015 (the “GSMS 2015-GC30 PSA”), by and among GS Mortgage Securities Corporation II, as depositor, Midland Loan Services, a Division of PNC 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, BellOak, LLC (as successor to Trimont Real Estate Advisors, Inc.), as operating advisor, U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as trustee, and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as certificate administrator (filed as Exhibit 4.2 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein). (see Explanatory Note #2)
4.3	Pooling and Servicing Agreement, dated as of April 1, 2015 (the “CGCMT 2015-GC29 PSA”), by and among Citigroup Commercial Mortgage Securities, Inc., 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, Situs Holdings, LLC, as operating advisor, Citibank, N.A., as certificate administrator, and Deutsche Bank Trust Company Americas, as trustee (filed as Exhibit 4.3 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein). (see Explanatory Note #3)
10.1	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, 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 Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.1 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).

4.2	Pooling and Servicing Agreement, dated as of May 1, 2015 (the “GSMS 2015-GC30 PSA”), by and among GS Mortgage Securities Corporation II, as depositor, Midland Loan Services, a Division of PNC 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, BellOak, LLC (as successor to Trimont Real Estate Advisors, Inc.), as operating advisor, U.S. Bank National Association, as trustee, and U.S. Bank National Association, as certificate administrator (filed as Exhibit 4.2 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein). (see Explanatory Note #1)
10.2	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, between Goldman Sachs Mortgage Company and Citigroup Commercial Mortgage Securities Inc., pursuant to which Goldman Sachs Mortgage Company sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.2 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
4.3	Pooling and Servicing Agreement, dated as of April 1, 2015 (the “CGCMT 2015-GC29 PSA”), by and among Citigroup Commercial Mortgage Securities, Inc., 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, Situs Holdings, LLC, as operating advisor, Citibank, N.A., as certificate administrator, and Deutsche Bank Trust Company Americas, as trustee (filed as Exhibit 4.3 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein). (see Explanatory Note #2)
10.3	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, 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 Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.3 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
10.1	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, 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 Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.1 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
10.4	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, between RAIT Funding, LLC and Citigroup Commercial Mortgage Securities Inc., pursuant to which RAIT Funding, LLC sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.4 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).

10.2	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, between Goldman Sachs Mortgage Company and Citigroup Commercial Mortgage Securities Inc., pursuant to which Goldman Sachs Mortgage Company sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.2 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
10.3	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, 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 Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.3 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
10.4	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, between RAIT Funding, LLC and Citigroup Commercial Mortgage Securities Inc., pursuant to which RAIT Funding, LLC sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.4 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, and is incorporated by reference herein).
10.5	Mortgage Loan Purchase Agreement, dated as of July 1, 2015, between KGS-Alpha Real Estate Capital Markets, LLC and Citigroup Commercial Mortgage Securities Inc., pursuant to which KGS-Alpha Real Estate Capital Markets, LLC sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 10.5 to the registrant’s Current Report on Form 8-K dated July 8, 2015, and filed by the registrant on July 8, 2015 under Commission File No. 333-189017-09, 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 #34)
33.1	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as master servicer
33.1a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as master servicer prior to March 1, 2025
33.1b	Report on assessment of compliance with servicing criteria for asset-backed securities, Trimont LLC, as master servicer on and after March 1, 2025
33.2	Report on assessment of compliance with servicing criteria for asset-backed securities, Torchlight Loan Services, LLC, as special servicer
33.3	Report on assessment of compliance with servicing criteria for asset-backed securities, Pentalpha Surveillance 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, Deutsche Bank Trust Company Americas, as custodian
33.6	Report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as trustee (see Exhibit 33.5)
33.7	Report on assessment of compliance with servicing criteria for asset-backed securities, CoreLogic Solutions, LLC, as servicing function participant
33.8	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA

33.6	Report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as trustee (see Exhibit 33.5)
33.9	Report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.7	Report on assessment of compliance with servicing criteria for asset-backed securities, CoreLogic Solutions, LLC, as servicing function participant
33.10	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.8	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.11	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 for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA (see Exhibit 33.10)
33.12	Report on assessment of compliance with servicing criteria for asset-backed securities, BellOak, LLC, as operating advisor for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.13	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.8)
33.14	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.8)
33.15	Report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as custodian for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.5)

33.9	Report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.16	Report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA
33.10	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.11	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as trustee for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA (see Exhibit 33.10)
33.12	Report on assessment of compliance with servicing criteria for asset-backed securities, BellOak, LLC, as operating advisor for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
33.13	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.8)
33.14	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.8)
33.15	Report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as custodian for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.5)
33.16	Report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA
33.17	Report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as trustee for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 33.5)
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
34.1a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as master servicer prior to March 1, 2025
34.1b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Trimont LLC, as master servicer on and after March 1, 2025
34.2	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Torchlight Loan Services, LLC, as special servicer
34.3	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Pentalpha Surveillance 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, Deutsche Bank Trust Company Americas, as custodian
34.6	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as trustee (see Exhibit 34.5)
34.7	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, CoreLogic Solutions, LLC, as servicing function participant
34.8	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA

34.8 Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA


34.9	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA

34.10	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA

34.11	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 for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA (see Exhibit 34.10)

34.12	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, BellOak, LLC, as operating advisor for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA

34.13	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.8)

34.14	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.8)

34.15	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as custodian for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.5)

34.16	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA

34.9	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, LNR Partners, LLC, as special servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
34.10	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as custodian for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
34.11	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as trustee for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA (see Exhibit 34.10)
34.12	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, BellOak, LLC, as operating advisor for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
34.13	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.8)
34.14	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.8)
34.15	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as custodian for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.5)
34.16	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as operating advisor for the Crowne Plaza Bloomington mortgage loan and the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA
34.17	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Deutsche Bank Trust Company Americas, as trustee for the Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 34.5)
35	Servicer compliance statements. (see Explanatory Note #45)
35.1	Servicer compliance statement, Wells Fargo Bank, National Association, as master servicer
35.1a	Servicer compliance statement, Wells Fargo Bank, National Association, as master servicer prior to March 1, 2025
35.1b	Servicer compliance statement, Trimont LLC, as master servicer on and after March 1, 2025
35.2	Servicer compliance statement, Torchlight Loan Services, LLC, as special servicer
35.3	Servicer compliance statement, Citibank, N.A., as certificate administrator
35.4	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the Dallas Market Center mortgage loan under the GSMS 2015-GC30 PSA
35.5	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer for the ~~Crowne Plaza Bloomington mortgage loan and the~~ Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 35.4)
35.6	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as special servicer for the ~~Crowne Plaza Bloomington mortgage loan and the~~ Selig Office Portfolio mortgage loan under the CGCMT 2015-GC29 PSA (see Exhibit 35.4)

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

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 3130, ~~2025~~2026 Citigroup Commercial Mortgage Securities Inc. (Depositor) /s/ Richard Simpson Richard Simpson, President

Filing Compare · Citigroup Commercial Mortgage Trust 2015-GC31