# EDGAR Filing Document

**Accession Number:** 0001643661
**File Stem:** 0001628297-23-000058
**Filing Date:** 2023-1
**Character Count:** 132075
**Document Hash:** 26bff76646856b577e14cc7243a21b81
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628297-23-000058.hdr.sgml**: 20230126

**ACCESSION NUMBER**: 0001628297-23-000058

**CONFORMED SUBMISSION TYPE**: 10-D

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20230112

**FILED AS OF DATE**: 20230126

**DATE AS OF CHANGE**: 20230126

**ABS ASSET CLASS**: Commercial mortgages

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Citigroup Commercial Mortgage Trust 2015-GC31
- **CENTRAL INDEX KEY:** 0001643661
- **STANDARD INDUSTRIAL CLASSIFICATION:** ASSET-BACKED SECURITIES [6189]
- **STATE OF INCORPORATION:** DE

**FILING VALUES:**
- **FORM TYPE:** 10-D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-189017-09
- **FILM NUMBER:** 23555472

**BUSINESS ADDRESS:**
- **STREET 1:** 388 GREENWICH STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10013
- **BUSINESS PHONE:** 2128166000

**MAIL ADDRESS:**
- **STREET 1:** 388 GREENWICH STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10013

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM 10-D** 

**ASSET-BACKED ISSUER** 

**DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF** 

**THE SECURITIES EXCHANGE ACT OF 1934** 

**For the monthly distribution period from:** 

**December 13, 2022 to January 12, 2023** 

**Commission File Number of issuing entity: 333-189017-09** 

**Central Index Key Number of issuing entity: 0001643661** 

## Citigroup Commercial Mortgage Trust 2015-GC31
**(Exact name of issuing entity as specified in its charter)** 

**Commission File Number of depositor: 333-189017** 

**Central Index Key Number of depositor: 0001258361** 

**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 names of sponsors as specified in their respective charters)** 

**Richard Simpson (212) 816-5343** 

**(Name and telephone number, including area code, of the person to contact in connection with this filing)** 

**New York** 

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

**47-4463366** 

**47-4475603** 

**47-7148307** 

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

---

| | |
|:---|:---|
| **c/o Citibank, N.A.**<br> **388 Greenwich Street, 14<sup>th</sup> Floor**<br> **New York, New York** | **10013** |
| **(Address of principal executive offices of the issuing entity)** | **(Zip Code)** |

---

**(212) 816-5693** 

**(Telephone number, including area code)** 

---

| | | | | |
|:---|:---|:---|:---|:---|
| **Title of class** | **Registered/reporting pursuant to**<br> **(check one)** | **Registered/reporting pursuant to**<br> **(check one)** | **Registered/reporting pursuant to**<br> **(check one)** | **Name of exchange**<br> **(If Section 12(b))** |
|  | **Section 12(b)** | **Section 12(g)** | **Section 15(d)** | **Name of exchange**<br> **(If Section 12(b))** |
|  A-1 | ☐ | ☐ | ☒ | Not Applicable |
|  A-2 | ☐ | ☐ | ☒ | Not Applicable |
|  A-3 | ☐ | ☐ | ☒ | Not Applicable |
|  A-4 | ☐ | ☐ | ☒ | Not Applicable |
|  A-AB | ☐ | ☐ | ☒ | Not Applicable |
|  X-A | ☐ | ☐ | ☒ | Not Applicable |
|  A-S | ☐ | ☐ | ☒ | Not Applicable |
|  B | ☐ | ☐ | ☒ | Not Applicable |
|  PEZ | ☐ | ☐ | ☒ | Not Applicable |
|  C | ☐ | ☐ | ☒ | Not Applicable |
|  D | ☐ | ☐ | ☒ | Not Applicable |

---

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 ☐

------

**PART I – DISTRIBUTION INFORMATION** 

**Item 1. Distribution and Pool Performance Information.** 

On January 12, 2023, a distribution was made to holders of the certificates issued by Citigroup Commercial Mortgage Trust 2015-GC31.

The distribution report is attached as Exhibit 99.1 to this Form 10-D.

No assets securitized by Citigroup Commercial Mortgage Securities Inc. (the "Depositor") and held by Citigroup Commercial Mortgage Trust 2015-GC31 were the subject of a demand to repurchase or replace for breach of the representations and warranties contained in the underlying transaction documents during the monthly distribution period covered by this distribution report on Form 10-D.

The Depositor most recently filed a Form ABS-15G under Rule 15Ga-1 under the Securities Exchange Act of 1934 ("Rule 15Ga-1") on February 11, 2022. The CIK number of the Depositor is 0001258361.

Citigroup Global Markets Realty Corp. ("CGMRC"), one of the sponsors, most recently filed a Form ABS-15G under Rule 15Ga-1 on February 11, 2022. The CIK number of CGMRC is 0001541001.

Goldman Sachs Mortgage Company ("GSMC"), one of the sponsors, most recently filed a Form ABS-15G under Rule 15Ga-1 on November 14, 2022. The CIK number of GSMC is 0001541502.

LMF Commercial, LLC (f/k/a Rialto Mortgage Finance, LLC) ("LMF"), one of the sponsors, most recently filed a Form ABS-15G under Rule 15Ga-1 on February 14, 2022. The CIK number of LMF is 0001592182.

RAIT Funding, LLC ("RAIT"), one of the sponsors, most recently filed a Form ABS-15G under Rule 15Ga-1 on February 16, 2021. The CIK number of RAIT is 0001587045.

Brunello Purchaser LLC, the parent of KGS-Alpha Real Estate Capital Markets, LLC, one of the sponsors, most recently filed a Form ABS-15G under Rule 15Ga-1 on January 31, 2022. The CIK number of Brunello Purchaser LLC is 0001765483.

**Item 1A. Asset-Level Information.** 

Not applicable

**Item 1B. Asset Representations Reviewer and Investor Communication.** 

Not applicable

**PART II – OTHER INFORMATION** **Item 2. Legal Proceedings.** 

No information to report for the monthly distribution period covered by this distribution report on Form 10-D.

**Item 3. Sales of Securities and Use of Proceeds.** 

None

**Item 4. Defaults Upon Senior Securities.** 

None

------

**Item 5. Submission of Matters to a Vote of Security Holders.** 

None

**Item 6. Significant Obligors of Pool Assets.**

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 -$4,326,648 from January 01, 2022 through June 30, 2022. There is no material update at this time.

**Item 7. Change in Sponsor Interest in Securities.** 

None

**Item 8. Significant Enhancement Provider Information.** 

None

**Item 9. Other Information.**

None

**Item 10. Exhibits.** 

(a) The following is a list of documents filed as part of this Form 10-D:

(99.1): Monthly report distributed to holders of the certificates issued by Citigroup Commercial Mortgage Trust 2015-GC31, relating to the January 12, 2023 distribution.

(b) The exhibits required to be filed by the Registrant pursuant to this Form 10-D are listed above and in the Exhibit Index that immediately precedes the signature page hereof.

------

EXHIBIT INDEX

---

| | |
|:---|:---|
| Exhibit Number | Description |
| Exhibit 99.1 | [Monthly report distributed to holders of the certificates issued by Citigroup Commercial Mortgage Trust 2015-GC31, relating to the January 12, 2023 distribution.](ex99_1.htm) |

---

------

**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 thereunto duly authorized.

---

| |
|:---|
| Citigroup Commercial Mortgage Securities Inc. |
| (Depositor) |
| /s/ Richard Simpson |
| Richard Simpson, President |

---

Date: January 26, 2023

## Exhibit 99.1

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |

---

---

| | |
|:---|:---|
| ***CONTACT INFORMATION*** |  |
| &nbsp;&nbsp;&nbsp;&nbsp; Depositor | Citigroup Commercial Mortgage Securities Inc. |
| &nbsp;&nbsp;&nbsp;&nbsp; Master Servicer | Wells Fargo Bank, National Association |
| &nbsp;&nbsp;&nbsp;&nbsp; Trustee | Deutsche Bank Trust Company Americas |
| &nbsp;&nbsp;&nbsp;&nbsp; Certificate Administrator | Citibank, N.A. |
| &nbsp;&nbsp;&nbsp;&nbsp; Special Servicer | Torchlight Loan Services, LLC |
| &nbsp;&nbsp;&nbsp;&nbsp; Operating Advisor | Pentalpha Surveillance LLC. |

---

---

| | |
|:---|:---|
| ***CONTENTS*** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Distribution Summary - Active Certificates | 2.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Distribution Summary (Factors) | 3.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Interest Distribution Detail | 4.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Principal Distribution Detail | 5.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reconciliation Detail | 6.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other Information | 7.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Stratification Detail | 8.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Mortgage Loan Detail | 11.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NOI Detail | 13.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Delinquency Loan Detail | 15.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Appraisal Reduction Detail | 17.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Loan Modification Detail | 19.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Specially Serviced Loan Detail | 22.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unscheduled Principal Detail | 29.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Liquidated Loan Detail | 31.0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CREFC Legends | 33.0 |

---

---

| | | |
|:---|:---|:---|
| **Deal Contact:** | **Danny Lee** | **Citibank, N.A.** |
|  | **danny1.lee@citi.com** | **Agency and Trust** |
|  | **Tel: (212) 816-4936** | **388 Greenwich Street, 14th Floor** |
|  |  | **New York, NY 10013** |

---

Reports Available at <u> sf.citidirect.com</u> Page 1 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Distribution Summary - Active Certificates*** |
| ***DISTRIBUTION IN DOLLARS*** | ***DISTRIBUTION IN DOLLARS*** |  |

---

---

| | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Prior | Pass- | Accrual |  |  |  |  |  |  |  |  |  |  | Current |
|  | Original | Principal | Through | Day Count | Accrual | Interest | Principal | PPP and YM |  | &nbsp;&nbsp;&nbsp;&nbsp; Total |  | Deferred | Realized |  | Principal |
| Class | Balance | Balance | Rate | Fraction | Dates | Distributed | Distributed | Distributed |  | Distributed |  | Interest | Loss |  | Balance |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10)= | (7 | +8+9) | (11) | (12) | (13)= | (3-8+11-12) |
| Class A-1 | 28330000.00 | 0.00 | 1.637000% |  |  | 0.00 | 0.00 | 0.00 |  | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
| Class A-2 | 2298000.00 | 0.00 | 3.084000% |  |  | 0.00 | 0.00 | 0.00 |  | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
| Class A-3 | 160000000.00 | 144903327.65 | 3.497000% | 30/360 | 12/01 - 12/31 | 422272.45 | 0.00 | 0.00 |  | 422272.45 |  | 0.00 | 0.00 |  | 144903327.65 |
| Class A-4 | 268724000.00 | 268724000.00 | 3.762000% | 30/360 | 12/01 - 12/31 | 842449.74 | 0.00 | 0.00 |  | 842449.74 |  | 0.00 | 0.00 |  | 268724000.00 |
| Class A-AB | 46974000.00 | 22931469.43 | 3.431000% | 30/360 | 12/01 - 12/31 | 65564.89 | 811129.02 | 0.00 |  | 876693.91 |  | 0.00 | 0.00 |  | 22120340.41 |
| Class A-S | 58763000.00 | 58763000.00 | 4.036261% | 30/360 | 12/01 - 12/31 | 197652.34 | 0.00 | 0.00 |  | 197652.34 |  | 0.00 | 0.00 |  | 58763000.00 |
| Class B | 42871000.00 | 42871000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 144234.52 | 0.00 | 0.00 |  | 144234.52 |  | 0.00 | 0.00 |  | 42871000.00 |
| Class C | 33852000.00 | 33852000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 113891.14 | 0.00 | 0.00 |  | 113891.14 |  | 0.00 | 0.00 |  | 33852000.00 |
| Class D | 24284000.00 | 24284000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 81700.71 | 0.00 | 0.00 |  | 81700.71 |  | 0.00 | 0.00 |  | 24284000.00 |
| Class E | 11000000.00 | 11000000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 37008.23 | 0.00 | 0.00 |  | 37008.23 |  | 0.00 | 0.00 |  | 11000000.00 |
| Class F | 14864000.00 | 14864000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 50008.21 | 0.00 | 0.00 |  | 50008.21 |  | 0.00 | 0.00 |  | 14864000.00 |
| Class G | 12231000.00 | 12231000.00 | 4.037261% | 30/360 | 12/01 - 12/31 | 41149.78 | 0.00 | 0.00 |  | 41149.78 |  | 0.00 | 0.00 |  | 12231000.00 |
| Class H | 19132869.00 | 18096204.22 | 4.037261% | 30/360 | 12/01 - 12/31 | 35854.81 | 0.00 | 0.00 |  | 35854.81 |  | 0.00 | 0.00 |  | 18096204.22 |
| Class R | 0.00 | 0.00 | 0.000000% |  |  | 0.00 | 0.00 | 0.00 |  | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
| Class S | 0.00 | 0.00 | 0.000000% |  |  | 0.00 | 0.00 | 0.00 |  | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 723323869.00 | 652520001.30 |  |  |  | 2031786.82 | 811129.02 | 0.00 |  | 2842915.84 |  | 0.00 | 0.00 |  | 651708872.28 |
| **Notional Classes** |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Class X-A | 565089000.00 | 495321797.08 | 0.335572% | 30/360 | 12/01 - 12/31 | 138513.42 | 0.00 | 0.00 |  | 138513.42 |  | 0.00 | 0.00 |  | 494510668.06 |
| **Non-Active Exchangeable Certificates** | **Non-Active Exchangeable Certificates** | **Non-Active Exchangeable Certificates** |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Class PEZ | 135486000.00 | 135486000.00 | 0.000000% | 30/360 | 12/01 - 12/31 | 0.00 | 0.00 | 0.00 |  | 0.00 |  | 0.00 | 0.00 |  | 135486000.00 |

---

Reports Available at <u> sf.citidirect.com</u> Page 2 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Distribution Summary (Factors)*** |
| ***PER $1,000 OF ORIGINAL BALANCE*** | ***PER $1,000 OF ORIGINAL BALANCE*** |  |

---

---

| | | | | | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  |  |  | Prior |  |  |  |  |  |  |  |  |  |  |  |  |  | Current |
|  |  |  | Record |  | Principal |  | Interest |  | Principal |  | PPP and YM |  | &nbsp;&nbsp;&nbsp; Total |  | Deferred |  |  |  | Principal |
| Class | CUSIP |  | Date |  | Balance |  | Distributed |  | Distributed |  | Distributed |  | Distributed |  | Interest |  | Realized Loss |  | Balance |
|  |  |  |  | (3)/ | &nbsp;&nbsp;&nbsp;&nbsp; (2) x 1000 | (7)/ | (2) x 1000 | (8)/ | (2) x 1000 | (9)/ | (2) x 1000 | (10)/ | &nbsp;&nbsp;&nbsp;&nbsp; (2) x 1000 | (11)/ | &nbsp;&nbsp;&nbsp;&nbsp; (2) x 1000 | (12)/ | &nbsp;&nbsp;&nbsp;&nbsp; (2) x 1000 | (14)/ | (2) x 1000 |
| Class A-1 | 17323 | YAA7 | 12/30/2022 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 0.000000 |
| Class A-2 | 17323 | YAB5 | 12/30/2022 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 0.000000 |
| Class A-3 | 17323 | YAC3 | 12/30/2022 |  | 905.645798 |  | 2.639203 |  | 0.000000 |  | 0.000000 |  | 2.639203 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 905.645798 |
| Class A-4 | 17323 | YAD1 | 12/30/2022 |  | 1000.000000 |  | 3.135000 |  | 0.000000 |  | 0.000000 |  | 3.135000 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class A-AB | 17323 | YAE9 | 12/30/2022 |  | 488.173658 |  | 1.395770 |  | 17.267617 |  | 0.000000 |  | 18.663386 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 470.906042 |
| Class A-S | 17323 | YAF6 | 12/30/2022 |  | 1000.000000 |  | 3.363551 |  | 0.000000 |  | 0.000000 |  | 3.363551 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class B | 17323 | YAG4 | 12/30/2022 |  | 1000.000000 |  | 3.364384 |  | 0.000000 |  | 0.000000 |  | 3.364384 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class C | 17323 | YAH2 | 12/30/2022 |  | 1000.000000 |  | 3.364384 |  | 0.000000 |  | 0.000000 |  | 3.364384 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class D | 17323 | YAJ8 | 12/30/2022 |  | 1000.000000 |  | 3.364384 |  | 0.000000 |  | 0.000000 |  | 3.364384 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class E | 17323 | YAN9 | 12/30/2022 |  | 1000.000000 |  | 3.364385 |  | 0.000000 |  | 0.000000 |  | 3.364385 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class F | 17323 | YAQ2 | 12/30/2022 |  | 1000.000000 |  | 3.364384 |  | 0.000000 |  | 0.000000 |  | 3.364384 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class G | 17323 | YAS8 | 12/30/2022 |  | 1000.000000 |  | 3.364384 |  | 0.000000 |  | 0.000000 |  | 3.364384 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 1000.000000 |
| Class H | 17323 | YAU3 | 12/30/2022 |  | 945.817599 |  | 1.873990 |  | 0.000000 |  | 0.000000 |  | 1.873990 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 945.817599 |
| Class R | 17323 | YAY5 | 12/30/2022 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 0.000000 |
| Class S | 17323 | YAW9 | 12/30/2022 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | 0.000000 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 0.000000 |
| Class X-A | 17323 | YAL3 | 12/30/2022 |  | 876.537673 |  | 0.245118 |  | 0.000000 |  | 0.000000 |  | 0.245118 |  | &nbsp;&nbsp;&nbsp; 0.000000 |  | 0.000000 |  | 875.102272 |

---

Reports Available at <u> sf.citidirect.com</u> Page 3 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Interest Distribution Detail*** |
| ***DISTRIBUTION IN DOLLARS*** |  |  |

---

---

| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | Prior | Pass- | Accrual | &nbsp;&nbsp;&nbsp; Optimal | Prior | Interest on | Non-Recov. |  |  |  |  |  | Current |
|  | Principal | Through | Day | &nbsp;&nbsp; Accrued | Unpaid | Prior Unpaid | Interest |  | &nbsp;&nbsp;&nbsp;&nbsp; Interest | Deferred | &nbsp;&nbsp; Interest |  | Unpaid |
| &nbsp;&nbsp;&nbsp; Class | Balance | Rate | Count | &nbsp;&nbsp; Interest | Interest | Interest | Shortfall |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Due | Interest | Distributed |  | Interest |
| &nbsp;&nbsp;&nbsp;&nbsp; (1) | (2) | (3) | Fraction | (6) | (7) | (8) | (9) | (10)= | (6)+(7)+(8)-(9) | (11) | (12) | (13)= | (10)-(11)-(12) |
| Class A-1 | 0.00 | 1.637000% |  | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00 |  | 0.00 |
| Class A-2 | 0.00 | 3.084000% |  | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00 |  | 0.00 |
| Class A-3 | 144903327.65 | 3.497000% | 30/360 | 422272.45 | 0.00 | 0.00 | 0.00 |  | 422272.45 | 0.00 | 422272.45 |  | 0.00 |
| Class A-4 | 268724000.00 | 3.762000% | 30/360 | 842449.74 | 0.00 | 0.00 | 0.00 |  | 842449.74 | 0.00 | 842449.74 |  | 0.00 |
| Class A-AB | 22931469.43 | 3.431000% | 30/360 | 65564.89 | 0.00 | 0.00 | 0.00 |  | 65564.89 | 0.00 | 65564.89 |  | 0.00 |
| Class A-S | 58763000.00 | 4.036261% | 30/360 | 197652.34 | 0.00 | 0.00 | 0.00 |  | 197652.34 | 0.00 | 197652.34 |  | 0.00 |
| Class B | 42871000.00 | 4.037261% | 30/360 | 144234.52 | 0.00 | 0.00 | 0.00 |  | 144234.52 | 0.00 | 144234.52 |  | 0.00 |
| Class C | 33852000.00 | 4.037261% | 30/360 | 113891.14 | 0.00 | 0.00 | 0.00 |  | 113891.14 | 0.00 | 113891.14 |  | 0.00 |
| Class D | 24284000.00 | 4.037261% | 30/360 | 81700.71 | 0.00 | 0.00 | 0.00 |  | 81700.71 | 0.00 | 81700.71 |  | 0.00 |
| Class E | 11000000.00 | 4.037261% | 30/360 | 37008.23 | 0.00 | 0.00 | 0.00 |  | 37008.23 | 0.00 | 37008.23 |  | 0.00 |
| Class F | 14864000.00 | 4.037261% | 30/360 | 50008.21 | 0.00 | 0.00 | 0.00 |  | 50008.21 | 0.00 | 50008.21 |  | 0.00 |
| Class G | 12231000.00 | 4.037261% | 30/360 | 41149.78 | 0.00 | 0.00 | 0.00 |  | 41149.78 | 0.00 | 41149.78 |  | 0.00 |
| Class H | 18096204.22 | 4.037261% | 30/360 | 60882.59 | 488998.76 | 1645.18 | 0.00 |  | 551526.53 | 0.00 | 35854.81 |  | 515671.72 |
| Class R | 0.00 | 0.000000% |  | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00 |  | 0.00 |
| Class S | 0.00 | 0.000000% |  | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00 |  | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp; Totals | 652520001.30 |  |  | 2056814.60 | 488998.76 | 1645.18 | 0.00 |  | 2547458.54 | 0.00 | 2031786.82 |  | 515671.72 |
| **Notional Classes** |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Class X-A | 495321797.08 | 0.335572% | 30/360 | 138513.42 | 0.00 | 0.00 | 0.00 |  | 138513.42 | 0.00 | 138513.42 |  | 0.00 |

---

Reports Available at <u> sf.citidirect.com</u> Page 4 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
| ***DISTRIBUTION IN DOLLARS*** |  | ***Principal Distribution Detail*** |

---

---

| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Prior |  |  | Current | Current |  | Current | Cumulative | Original | Current | Original Current | Original Current |
|  | Original | Principal | Principal | Balance | Realized | Principal |  | Principal | Realized | Class | Class | Credit | Credit |
| &nbsp;&nbsp; Class | Balance | Balance | Distribution | Change | Losses | Recoveries |  | Balance | Losses | &nbsp;&nbsp; (%) | &nbsp;&nbsp; (%) | Support Support | Support Support |
| (1) | (2) | (3) | (4) | (6) | (7) | (8) | (9)= | (3)-(4)-(5)+(6)- | (10) | (11) | (12) | (13) | (14) |
|  |  |  |  |  |  |  | (7)+ | (8) |  |  |  |  |  |
| Class R | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class S | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-1 | 28330000.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-2 | 2298000.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 0.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-3 | 160000000.00 | 144903327.65 | 0.00 | 0.00 | 0.00 | 0.00 |  | 144903327.65 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-4 | 268724000.00 | 268724000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 268724000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-AB | 46974000.00 | 22931469.43 | 811129.02 | 0.00 | 0.00 | 0.00 |  | 22120340.41 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class A-S | 58763000.00 | 58763000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 58763000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class B | 42871000.00 | 42871000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 42871000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class C | 33852000.00 | 33852000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 33852000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class D | 24284000.00 | 24284000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 24284000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class E | 11000000.00 | 11000000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 11000000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class F | 14864000.00 | 14864000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 14864000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class G | 12231000.00 | 12231000.00 | 0.00 | 0.00 | 0.00 | 0.00 |  | 12231000.00 | 0.00 | 0.00% | 0.00% | 0.00% | 0.00% |
| Class H | 19132869.00 | 18096204.22 | 0.00 | 0.00 | 0.00 | 0.00 |  | 18096204.22 | 1036664.78 | 0.00% | 0.00% | 0.00% | 0.00% |
| Totals | 723323869.00 | 652520001.30 | 811129.02 | 0.00 | 0.00 | 0.00 |  | 651708872.28 | 1036664.78 | 0.00% | 0.00% |  |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 5 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Reconciliation Detail*** |

---

---

| | | |
|:---|:---|:---|
| ***SOURCE OF FUNDS*** | ***SOURCE OF FUNDS*** | ***SOURCE OF FUNDS*** |
| Interest Funds Available |  |  |
| &nbsp;&nbsp;&nbsp; Scheduled Interest | 2278411.45 |  |
| &nbsp;&nbsp;&nbsp; Prepayment Interest Shortfall | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Interest Adjustments | 0.00 |  |
| &nbsp;&nbsp;&nbsp; ASER Amount | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Realized Loss in Excess of Principal Balance | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Interest Funds Available: |  | 2278411.45 |
| Principal Funds Available |  |  |
| &nbsp;&nbsp;&nbsp; Scheduled Principal | 811129.02 |  |
| &nbsp;&nbsp;&nbsp; Unscheduled Principal Collections | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Repurchased Principal | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Substitution Principal | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Other Principal | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Principal Funds Available: |  | 811129.02 |
| Other Funds Available |  |  |
| &nbsp;&nbsp;&nbsp; Yield Maintenance Charges | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Withdrawal of Withheld Amounts from the Interest Reserve Account | 0.00 |  |
| &nbsp;&nbsp;&nbsp; Deposit of Withheld Amounts to the Interest Reserve Account | (73177.60) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Other Funds Available: |  | (73177.60) |
| Total Funds Available |  | 3016362.87 |

---

---

| | | |
|:---|:---|:---|
| ***ALLOCATION OF FUNDS*** | ***ALLOCATION OF FUNDS*** | ***ALLOCATION OF FUNDS*** |
| Scheduled Fees |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Servicing Fee | 6984.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trustee/Certificate Administrator Fee | 1910.42 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Operating Advisor Fee | 730.46 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CREFC® Intellectual Property Royalty License Fee | 280.95 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Scheduled Fees: |  | 9905.83 |
| Additional Fees, Expenses, etc. |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Additional Servicing Fee | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Special Servicing Fee | 25027.78 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Work-out Fee | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Liquidation Fee | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trust Fund Expenses | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trust Advisor Expenses | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reimbursement of Interest on Advances to the Servicer | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Borrower Reimbursable Trust Fund Expenses | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other Expenses | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Additional Fees, Expenses, etc.: |  | 25027.78 |
| Distributions |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Interest Distribution | 2170300.24 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Principal Distribution | 811129.02 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Yield Maintenance Charge Distribution | 0.00 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Distributions: |  | 2981429.26 |
| Total Funds Allocated |  | 3016362.87 |

---

Reports Available at <u> sf.citidirect.com</u> Page 6 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ***Other Information*** |

---

---

| | |
|:---|:---|
| **Interest Reserve Account Information** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Beginning Interest Reserve Account Balance | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Deposit of Withheld Amounts to the Interest Reserve Account | 73177.60 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Withdrawal of Withheld Amounts from the Interest Reserve Account | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ending Interest Reserve Account Balance | 73177.60 |
| **Excess Liquidation Proceeds Reserve Account Information** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Beginning Excess Liquidation Proceeds Reserve Account Balance | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Deposit to the Excess Liquidation Proceeds Reserve Account | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Withdrawal from the Excess Liquidation Proceeds Reserve Account | 0.00 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ending Excess Liquidation Proceeds Reserve Account Balance | 0.00 |
| **Collateral Information** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; % of Cut-Off Principal Balance Outstanding | 90.099180% |
| **Controlling Class Information** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Controlling Class is Class H. |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The Controlling Class Representative is Torchlight Investors, LLC |  |
| There Are No Disclosable Special Servicer Fees. |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 7 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Stratification Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** | ***Ending Scheduled Balance*** |
| Ending Sched | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| Balance | Loans | &nbsp;&nbsp;&nbsp; Balance | Balance | WAC | WAM | DSCR |
| 0 or Less | 3 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 1 to 5,000,000 | 16 | 54973105.98 | 8.44 | 4.4371 | 28 | 2.045225 |
| 5,000,001 to 10,000,000 | 15 | 101159066.38 | 15.52 | 4.3080 | 28 | 2.231919 |
| 10,000,001 to 15,000,000 | 5 | 59756073.93 | 9.17 | 4.2409 | 29 | 1.708043 |
| 15,000,001 to 20,000,000 | 1 | 17711371.21 | 2.72 | 4.4200 | 25 | 1.330400 |
| 20,000,001 to 25,000,000 | 3 | 64292081.83 | 9.87 | 4.0938 | 29 | 2.044668 |
| 25,000,001 to 30,000,000 | 3 | 79550951.12 | 12.21 | 4.2306 | 29 | 1.531686 |
| 30,000,001 to 35,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 35,000,001 to 40,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 40,000,001 to 45,000,000 | 1 | 40885230.46 | 6.27 | 4.1300 | 29 | 1.481700 |
| 45,000,001 to 50,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 50,000,001 to 55,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 55,000,001 to 60,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 60,000,001 to 65,000,000 | 1 | 61380991.37 | 9.42 | 4.0975 | 28 | 1.452900 |
| 65,000,001 to 70,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 70,000,001 to 75,000,000 | 1 | 72000000.00 | 11.05 | 3.9085 | 27 | 2.113800 |
| 75,000,001 to 80,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 80,000,001 to 85,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 85,000,001 to 90,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 90,000,001 or Greater | 1 | 100000000.00 | 15.34 | 3.2950 | 88 | -3.205700 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |
| *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* |  |  |  |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| ***State*** | ***State*** | ***State*** | ***State*** | ***State*** | ***State*** | ***State*** | ***State*** |
|  |  | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| State |  | Loans | &nbsp;&nbsp;&nbsp; Balance | Balance | WAC | WAM | DSCR |
| California |  | 4 | 93978657.25 | 14.42 | 4.1806 | 29 | 1.916506 |
| Colorado |  | 1 | 2739019.56 | 0.42 | 4.3100 | 29 | 1.555000 |
| Florida |  | 6 | 36457986.22 | 5.59 | 4.3801 | 29 | 1.674634 |
| Hawaii |  | 1 | 9000000.00 | 1.38 | 3.9300 | 29 | 5.477000 |
| Iowa |  | 1 | 3247770.20 | 0.50 | 4.3900 | 29 | 1.471100 |
| Illinois |  | 1 | 100000000.00 | 15.34 | 3.2950 | 88 | -3.205700 |
| JN |  | 1 | 26342475.95 | 4.04 | 4.4100 | 29 | 1.394400 |
| Kansas |  | 1 | 5273703.50 | 0.81 | 4.4900 | 29 | 1.673100 |
| Louisiana |  | 1 | 7883498.52 | 1.21 | 4.1730 | 28 | 1.230300 |
| Maryland |  | 1 | 12073005.33 | 1.85 | 3.9970 | 28 | 1.568900 |
| Michigan |  | 4 | 15191494.18 | 2.33 | 4.4906 | 28 | 2.264654 |
| Minnesota |  | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| NB |  | 1 | 9882925.24 | 1.52 | 4.4100 | 29 | 2.802600 |
| North Carolina |  | 1 | 3892767.43 | 0.60 | 4.4000 | 28 | 1.390200 |
| New Jersey |  | 1 | 2134575.14 | 0.33 | 4.7700 | 26 | 2.444800 |
| Nevada |  | 1 | 5633002.91 | 0.86 | 4.1905 | 22 | 3.506400 |
| Ohio |  | 2 | 2147490.77 | 0.33 | 4.7000 | 28 | 1.911400 |
| Oklahoma |  | 2 | 31706695.83 | 4.87 | 4.0002 | 28 | 1.707378 |
| Oregon |  | 1 | 10227883.41 | 1.57 | 4.1540 | 29 | 2.293500 |
| Pennsylvania |  | 1 | 6183573.00 | 0.95 | 4.3000 | 29 | 1.236000 |
| Rhode Island |  | 1 | 5155000.00 | 0.79 | 4.1400 | 29 | 1.841700 |
| South Carolina |  | 1 | 2770449.08 | 0.43 | 4.7200 | 29 | 2.101300 |
| Texas |  | 6 | 101341284.27 | 15.55 | 4.1480 | 28 | 1.493745 |
| Various |  | 9 | 158445614.49 | 24.31 | 4.1303 | 27 | 1.873763 |
|  | Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |

---

Reports Available at <u> sf.citidirect.com</u> Page 8 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Stratification Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| ***Seasoning*** | ***Seasoning*** | ***Seasoning*** | ***Seasoning*** | ***Seasoning*** | ***Seasoning*** | ***Seasoning*** |
|  | # of | &nbsp;&nbsp;&nbsp;&nbsp; Ending Sched | % of Agg |  |  | Wtd Avg |
| Seasoning | Loans | Balance | Balance | WAC | WAM | DSCR |
| 12 Months or Less | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 13 to 24 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 25 to 36 Months | 1 | 100000000.00 | 15.34 | 3.2950 | 88 | -3.205700 |
| 37 to 48 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 49 Months or Greater | 49 | 551708872.28 | 84.66 | 4.1923 | 28 | 1.847165 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| ***Property Type*** | ***Property Type*** | ***Property Type*** | ***Property Type*** | ***Property Type*** | ***Property Type*** | ***Property Type*** | ***Property Type*** |
| Property |  | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| Type |  | Loans | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Balance | Balance | WAC | WAM | DSCR |
| Other |  | 9 | 158445614.49 | 24.31 | 4.1303 | 27 | 1.873763 |
| Multifamily |  | 10 | 79142119.29 | 12.14 | 4.3238 | 28 | 1.783808 |
| Retail |  | 12 | 92760395.16 | 14.23 | 4.2876 | 29 | 1.907201 |
| Industrial |  | 1 | 5401966.47 | 0.83 | 4.2800 | 29 | 2.283300 |
| Office |  | 7 | 182521543.26 | 28.01 | 3.6572 | 61 | -0.994044 |
| Mixed Use |  | 4 | 106853197.95 | 16.40 | 4.1539 | 28 | 1.487405 |
| Lodging |  | 3 | 12621944.80 | 1.94 | 4.3883 | 29 | 2.531865 |
| Self Storage |  | 4 | 13962090.86 | 2.14 | 4.1698 | 29 | 4.423382 |
|  | Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** | ***Debt Service Coverage Ratio*** |
| Debt Service | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| Coverage Ratio | Loans | &nbsp;&nbsp;&nbsp; Balance | Balance | WAC | WAM | DSCR |
| 1.250 or Less | 10 | 149686920.58 | 22.97 | 3.6596 | 68 | -1.756953 |
| 1.251 to 1.500 | 8 | 200997531.45 | 30.84 | 4.2178 | 28 | 1.403398 |
| 1.501 to 1.750 | 8 | 67772767.57 | 10.40 | 4.2831 | 29 | 1.653339 |
| 1.751 to 2.000 | 9 | 60902978.90 | 9.35 | 4.2262 | 28 | 1.889772 |
| 2.001 to 2.250 | 4 | 82399080.53 | 12.64 | 3.9930 | 27 | 2.115302 |
| 2.251 to 2.500 | 3 | 17764425.02 | 2.73 | 4.2663 | 29 | 2.308579 |
| 2.501 to 2.750 | 3 | 20697882.86 | 3.18 | 4.1732 | 28 | 2.560535 |
| 2.751 to 3.000 | 1 | 9882925.24 | 1.52 | 4.4100 | 29 | 2.802600 |
| 3.001 to 3.250 | 1 | 22200000.00 | 3.41 | 3.9010 | 29 | 3.059800 |
| 3.251 to 3.500 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 3.501 to 3.750 | 1 | 5633002.91 | 0.86 | 4.1905 | 22 | 3.506400 |
| 3.751 to 4.000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 4.001 or Greater | 2 | 13771357.22 | 2.11 | 3.9394 | 29 | 4.982241 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |
| *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* |  |  |  |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** | ***Loan Rate*** |
| Loan |  | # of | &nbsp;&nbsp;&nbsp; Ending Sched | % of Agg |  |  | Wtd Avg |
| Rate (%) |  | Loans | Balance | Balance | WAC | WAM | DSCR |
| 4.00 or Less |  | 12 | 264359548.31 | 40.56 | 3.6869 | 51 | 0.291295 |
| 4.01 to 4.25 |  | 9 | 160873249.27 | 24.68 | 4.1256 | 28 | 1.588612 |
| 4.26 to 4.50 |  | 20 | 179860230.46 | 27.60 | 4.3688 | 29 | 1.593318 |
| 4.51 to 4.75 |  | 7 | 35308939.12 | 5.42 | 4.6343 | 28 | 1.691204 |
| 4.76 to 5.00 |  | 2 | 11306905.12 | 1.73 | 4.8349 | 28 | 1.739286 |
| 5.01 to 5.25 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 5.26 to 5.50 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 5.51 to 5.75 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 5.76 to 6.00 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 6.01 to 6.25 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 6.26 to 6.50 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 6.51 to 6.75 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 6.76 to 7.00 |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 7.01 or Greater |  | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
|  | Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |

---

Reports Available at <u> sf.citidirect.com</u> Page 9 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Stratification Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** | ***Anticipated Remaining Term*** |
| Anticipated | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| Remaining Term | Loans | Balance | Balance | WAC | WAM | DSCR |
| &nbsp;&nbsp; 60 Months or Less | 49 | 551708872.28 | 84.66 | 4.1923 | 28 | 1.847165 |
| &nbsp;&nbsp; 61 to 90 Months | 1 | 100000000.00 | 15.34 | 3.2950 | 88 | -3.205700 |
| 91 Months or Greater | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |
| *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* | *(When current DSCR is not available, the most currently provided DSCR will be used.)* |  |  |  |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| ***Remaining Amortization Term*** | ***Remaining Amortization Term*** | ***Remaining Amortization Term*** | ***Remaining Amortization Term*** | ***Remaining Amortization Term*** | ***Remaining Amortization Term*** | ***Remaining Amortization Term*** |
| Remaining | # of | Ending Sched | % of Agg |  |  | Wtd Avg |
| Amortization Term | Loans | Balance | Balance | WAC | WAM | DSCR |
| 240 Months or Less | 10 | 216979079.72 | 33.29 | 3.6539 | 56 | -0.128897 |
| 241 to 270 Months | 39 | 434729792.56 | 66.71 | 4.2547 | 28 | 1.671141 |
| 271 to 300 Months | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 301 Months or Greater | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals | 50 | 651708872.28 | 100.00 | 4.0546 | 37 | 1.071839 |

---

Reports Available at <u> sf.citidirect.com</u> Page 10 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Mortgage Loan Detail*** |

---

---

| | | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Prop |  |  |  |  |  | Neg | &nbsp;&nbsp; Beginning | Ending | &nbsp;&nbsp; Paid | Appraisal | Appraisal | Payment Workout | Payment Workout | Mod |
| Loan |  | Type |  |  | &nbsp;&nbsp; Interest | Principal | Gross | Maturity Am | &nbsp;&nbsp; Scheduled | &nbsp;&nbsp; Scheduled | Through | Reduction | Reduction | Status Strategy | Status Strategy | Type |
| Number | OMCR | (1) | City | State | Payment | Payment | Coupon | Date Flag | Balance | Balance | Date | Date | Amount | (2) | (3) | (4) |
| 304101385 | 001 | OF | Chicago | IL | 283736.11 | 0.00 | 3.29500% | 5/6/30 N | 100000000.00 | 100000000.00 | 10/6/21 | 2/6/22 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 3 | 1 | 0 |
| 304140002 | 002 | N/A | Various | Various | 242327.00 | 0.00 | 3.90850% | 4/6/25 N | 72000000.00 | 72000000.00 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140003 | 003 | MU | Dallas | TX | 217038.24 | 130760.18 | 4.09750% | 5/6/25 N | 61511751.55 | 61380991.37 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101400 | 004 | OF | Pasadena | CA | 145610.28 | 58064.63 | 4.13000% | 6/6/25 N | 40943295.09 | 40885230.46 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140005 | 005 | OF | Oklahoma City | OK | 88412.31 | 49552.31 | 3.93500% | 5/1/25 N | 26092087.67 | 26042535.36 | 1/1/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101392 | 006 | N/A | Various | Various | 101693.28 | 44987.51 | 4.34000% | 6/6/25 N | 27210927.32 | 27165939.81 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571327 | 007 | MF | Pine Hill | JN | 100178.69 | 37693.05 | 4.41000% | 6/6/25 N | 26380169.00 | 26342475.95 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140008 | 008 | MU | Orinda | CA | 80153.16 | 31902.92 | 4.27900% | 6/6/25 N | 21752999.73 | 21721096.81 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140009 | 009 | MU | Sugar Land | TX | 72167.89 | 37603.75 | 4.10650% | 6/6/25 N | 20408588.77 | 20370985.02 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140010 | 010 | RT | San Diego | CA | 74574.12 | 0.00 | 3.90100% | 6/6/25 N | 22200000.00 | 22200000.00 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571310 | 011 | N/A | Various | Various | 67547.90 | 35852.36 | 4.42000% | 2/6/25 N | 17747223.57 | 17711371.21 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101390 | 012 | N/A | Various | Various | 51945.42 | 23814.64 | 4.42000% | 6/6/25 N | 13647898.60 | 13624083.96 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571323 | 013 | RT | Port Charlotte | FL | 52214.92 | 22456.75 | 4.58000% | 6/6/25 N | 13239450.30 | 13216993.55 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140014 | 014 | RT | Hagerstown | MD | 41643.53 | 26124.88 | 3.99700% | 5/6/25 N | 12099130.21 | 12073005.33 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101380 | 015 | N/A | Various | Various | 36181.40 | 23135.75 | 3.95000% | 5/6/25 N | 10637243.43 | 10614107.68 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101397 | 017 | LO | Omaha | NB | 37600.85 | 18550.55 | 4.41000% | 6/6/25 N | 9901475.79 | 9882925.24 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 8 | 8 |
| 304140018 | 018 | MF | Tigard | OR | 36640.78 | 15397.18 | 4.15400% | 6/6/25 N | 10243280.59 | 10227883.41 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 301461017 | 019 | RT | Temecula | CA | 38369.56 | 14927.31 | 4.85000% | 5/6/25 N | 9187257.29 | 9172329.98 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101399 | 020 | SS | Kaneohe | HI | 30457.50 | 0.00 | 3.93000% | 6/6/25 N | 9000000.00 | 9000000.00 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140021 | 021 | MF | Lafayette | LA | 28384.34 | 15485.49 | 4.17300% | 5/6/25 N | 7898984.01 | 7883498.52 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101389 | 022 | OF | Coral Gables | FL | 26106.15 | 16602.20 | 3.95000% | 6/6/25 N | 7675144.92 | 7658542.72 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101398 | 023 | MF | DeWitt | MI | 27413.18 | 11928.76 | 4.38000% | 6/6/25 N | 7268188.22 | 7256259.46 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140024 | 024 | RT | Shippensburg | PA | 22943.38 | 12687.36 | 4.30000% | 6/1/25 N | 6196260.36 | 6183573.00 | 1/1/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101391 | 025 | RT | Houston | TX | 22334.63 | 10256.39 | 4.25000% | 6/6/25 N | 6102820.23 | 6092563.84 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571333 | 026 | MF | Deer Park | TX | 21900.11 | 9809.25 | 4.31000% | 6/6/25 N | 5900785.18 | 5890975.93 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140027 | 027 | MF | Stillwater | OK | 21010.77 | 10166.13 | 4.30000% | 5/6/25 N | 5674326.60 | 5664160.47 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140029 | 029 | IN | Doral | FL | 19944.91 | 9676.96 | 4.28000% | 6/1/25 N | 5411643.43 | 5401966.47 | 1/1/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |

---

Reports Available at <u> sf.citidirect.com</u> Page 11 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Mortgage Loan Detail*** |

---

---

| | | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Prop |  |  |  |  |  | Neg | &nbsp;&nbsp; Beginning | Ending | &nbsp;&nbsp; Paid | Appraisal | Appraisal | Payment Workout | Payment Workout | Mod |
| Loan |  | Type |  |  | &nbsp;&nbsp;&nbsp;&nbsp; Interest | &nbsp;&nbsp; Principal | Gross | Maturity Am | &nbsp;&nbsp; Scheduled | &nbsp;&nbsp; Scheduled | Through | Reduction | Reduction | Status Strategy | Status Strategy | Type |
| Number | OMCR | (1) | City | State | Payment | Payment | Coupon | Date Flag | Balance | Balance | Date | Date | Amount | (2) | (3) | (4) |
| 304140030 | 030 | MF | Reno | NV | 20357.15 | 8462.16 | 4.19050% | 11/6/24 N | &nbsp;&nbsp;&nbsp; 5641465.07 | 5633002.91 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571332 | 031 | RT | Overland Park | KS | 20425.39 | 9105.04 | 4.49000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 5282808.54 | 5273703.50 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571331 | 032 | N/A | Various | Various | 20226.27 | 8362.09 | 4.68000% | 3/6/25 N | &nbsp;&nbsp;&nbsp; 5018926.43 | 5010564.34 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140033 | 033 | OF | Troy | MI | 18390.89 | 8806.05 | 4.69000% | 2/6/25 N | &nbsp;&nbsp;&nbsp; 4553766.00 | 4544959.95 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140034 | 034 | RT | North Smithfield | RI | 18377.58 | 0.00 | 4.14000% | 6/1/25 N | &nbsp;&nbsp;&nbsp; 5155000.00 | 5155000.00 | 12/1/22 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | B | 13 | 0 |
| 304140035 | 035 | N/A | Various | Various | 16283.43 | 7463.55 | 3.95700% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 4778820.77 | 4771357.22 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 301461015 | 036 | N/A | Various | Various | 16303.59 | 8704.93 | 4.39000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 4312801.46 | 4304096.53 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571328 | 037 | RT | Lakeland | FL | 16748.39 | 8312.65 | 4.58000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 4246669.33 | 4238356.68 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140038 | 038 | MF | Kingsville | TX | 15674.70 | 7584.26 | 4.30000% | 5/6/25 N | &nbsp;&nbsp;&nbsp; 4233227.62 | 4225643.36 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140039 | 039 | RT | Winston-Salem | NC | 14779.22 | 7905.25 | 4.40000% | 5/6/25 N | &nbsp;&nbsp;&nbsp; 3900672.68 | 3892767.43 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101396 | 040 | RT | Tallahassee | FL | 11858.18 | 15114.18 | 4.40000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 3129725.26 | 3114611.08 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140041 | 041 | MU | Mesquite | TX | 13589.95 | 6543.27 | 4.66000% | 6/1/25 N | &nbsp;&nbsp;&nbsp; 3386668.02 | 3380124.75 | 1/1/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101386 | 042 | N/A | Various | Various | 11617.62 | 6854.31 | 4.15000% | 5/6/25 N | &nbsp;&nbsp;&nbsp; 3250948.05 | 3244093.74 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101387 | 043 | OF | Ann Arbor | MI | 13041.63 | 5491.81 | 4.46000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 3395766.58 | 3390274.77 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140044 | 044 | MF | Cedar Rapids | IA | 12299.05 | 5707.08 | 4.39000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 3253477.28 | 3247770.20 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304140045 | 045 | MF | North Charleston | SC | 11292.98 | 8032.39 | 4.72000% | 6/1/25 N | &nbsp;&nbsp;&nbsp; 2778481.47 | 2770449.08 | 1/1/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101407 | 046 | LO | Eagle | CO | 10196.51 | 8337.00 | 4.31000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 2747356.56 | 2739019.56 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 300571326 | 047 | SS | Eustis | FL | 10928.17 | 5247.75 | 4.48000% | 6/6/25 N | &nbsp;&nbsp;&nbsp; 2832763.47 | 2827515.72 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 0 | 0 |
| 304101388 | 049 | RT | Dover | OH | 8708.18 | 4154.04 | 4.70000% | 5/6/25 N | &nbsp;&nbsp;&nbsp; 2151644.81 | 2147490.77 | 1/6/23 | N/A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0 | 8 | 0 |
| 300571324 | 050 | SS | Hammonton | NJ | 8782.16 | 3504.90 | 4.77000% | 3/6/25 N | 2138080.04 | 2134575.14 | 1/6/23 | N/A | 0.00 | 0 | 0 | 0 |
| Totals | Count: | Count: | 47 |  | 2278411.45 | 811129.02 |  |  | 652520001.30 | 651708872.28 |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 |  |  |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 12 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***NOI Detail*** |

---

---

| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Property |  |  | &nbsp;&nbsp;&nbsp;&nbsp; Ending | &nbsp;&nbsp; Preceding | &nbsp;&nbsp;&nbsp; Most | Most Recent | Most Recent |
| Loan |  | Type |  |  | &nbsp;&nbsp; Scheduled | Fiscal | &nbsp;&nbsp; Recent | Financial As of | Financial As |
| Number | OMCR | (1) | City | State | Balance | Year NOI | NOI | Start Date | of End Date |
| 304101385 | 001 | &nbsp;&nbsp;&nbsp; OF | Chicago | IL | 100000000.00 | 3353173.59 | -6946657.18 | 01/01/2022 | 09/30/2022 |
| 304140002 | 002 | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 72000000.00 | 32826977.00 | 24767300.00 | 01/01/2022 | 09/30/2022 |
| 304140003 | 003 | &nbsp;&nbsp;&nbsp; MU | Dallas | TX | 61380991.37 | 22479058.00 | 23731328.00 | Not Available | Not Available |
| 304101400 | 004 | &nbsp;&nbsp;&nbsp; OF | Pasadena | CA | 40885230.46 | 2527900.51 | 2870309.22 | 01/01/2022 | 09/30/2022 |
| 304140005 | 005 | &nbsp;&nbsp;&nbsp; OF | Oklahoma City | OK | 26042535.36 | 3126352.38 | 2419188.21 | 01/01/2022 | 09/30/2022 |
| 304101392 | 006 | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 27165939.81 | 2419735.88 | 1897577.79 | 01/01/2022 | 09/30/2022 |
| 300571327 | 007 | &nbsp;&nbsp;&nbsp; MF | Pine Hill | JN | 26342475.95 | 1793983.00 | 1858837.00 | Not Available | Not Available |
| 304140008 | 008 | &nbsp;&nbsp;&nbsp; MU | Orinda | CA | 21721096.81 | 2371558.52 | 1807122.02 | 01/01/2022 | 09/30/2022 |
| 304140009 | 009 | &nbsp;&nbsp;&nbsp; MU | Sugar Land | TX | 20370985.02 | 2105165.57 | 1371143.98 | 01/01/2022 | 09/30/2022 |
| 304140010 | 010 | &nbsp;&nbsp;&nbsp; RT | San Diego | CA | 22200000.00 | 2950479.80 | 2121992.47 | 01/01/2022 | 09/30/2022 |
| 300571310 | 011 | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 17711371.21 | 1812117.00 | 421531.00 | Not Available | Not Available |
| 304101390 | 012 | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 13624083.96 | 1064987.56 | 798741.16 | Not Available | Not Available |
| 300571323 | 013 | &nbsp;&nbsp;&nbsp; RT | Port Charlotte | FL | 13216993.55 | 1270792.61 | 961714.99 | 01/01/2022 | 09/30/2022 |
| 304140014 | 014 | &nbsp;&nbsp;&nbsp; RT | Hagerstown | MD | 12073005.33 | 1313895.38 | 975650.65 | 01/01/2022 | 09/30/2022 |
| 304101380 | 015 | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 10614107.68 | 1740924.66 | 1407451.32 | 01/01/2022 | 09/30/2022 |
| 304101397 | 017 | &nbsp;&nbsp;&nbsp; LO | Omaha | NB | 9882925.24 | 1146986.29 | 2169430.49 | 10/01/2021 | 09/30/2022 |
| 304140018 | 018 | &nbsp;&nbsp;&nbsp; MF | Tigard | OR | 10227883.41 | 1344387.57 | 1099871.01 | Not Available | Not Available |
| 301461017 | 019 | &nbsp;&nbsp;&nbsp; RT | Temecula | CA | 9172329.98 | 879975.60 | 789540.06 | 01/01/2022 | 09/30/2022 |
| 304101399 | 020 | &nbsp;&nbsp;&nbsp; SS | Kaneohe | HI | 9000000.00 | 1719556.16 | 983169.90 | 01/01/2022 | 06/30/2022 |
| 304140021 | 021 | &nbsp;&nbsp;&nbsp; MF | Lafayette | LA | 7883498.52 | 610924.04 | 499793.50 | 01/01/2022 | 09/30/2022 |
| 304101389 | 022 | &nbsp;&nbsp;&nbsp; OF | Coral Gables | FL | 7658542.72 | 1380723.26 | 826516.87 | 01/01/2022 | 09/30/2022 |
| 304101398 | 023 | &nbsp;&nbsp;&nbsp; MF | DeWitt | MI | 7256259.46 | 903337.00 | 692632.00 | Not Available | Not Available |
| 304140024 | 024 | &nbsp;&nbsp;&nbsp; RT | Shippensburg | PA | 6183573.00 | 624640.26 | 460618.22 | 01/01/2022 | 09/30/2022 |
| 304101391 | 025 | &nbsp;&nbsp;&nbsp; RT | Houston | TX | 6092563.84 | 804608.96 | 572045.91 | 01/01/2022 | 09/30/2022 |
| 300571333 | 026 | &nbsp;&nbsp;&nbsp; MF | Deer Park | TX | 5890975.93 | 620034.46 | 522303.17 | 01/01/2022 | 09/30/2022 |
| 304140027 | 027 | &nbsp;&nbsp;&nbsp; MF | Stillwater | OK | 5664160.47 | 308477.00 | 185554.00 | Not Available | Not Available |
| 304140029 | 029 | &nbsp;&nbsp;&nbsp; IN | Doral | FL | 5401966.47 | 623759.76 | 638200.64 | 01/01/2022 | 09/30/2022 |

---

Reports Available at <u> sf.citidirect.com</u> Page 13 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***NOI Detail*** |

---

---

| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  | Property |  |  | &nbsp;&nbsp;&nbsp; Ending | Preceding | &nbsp;&nbsp;&nbsp; Most | Most Recent | Most Recent |
| Loan |  |  | Type |  |  | Scheduled | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Fiscal | &nbsp;&nbsp; Recent | Financial As of | Financial As |
| Number | OMCR |  | (1) | City | State | Balance | Year NOI | NOI | Start Date | of End Date |
| 304140030 | 030 |  | &nbsp;&nbsp;&nbsp; MF | Reno | NV | 5633002.91 | 1026033.00 | 232917.00 | Not Available | Not Available |
| 300571332 | 031 |  | &nbsp;&nbsp;&nbsp; RT | Overland Park | KS | 5273703.50 | 711047.35 | 493287.16 | 01/01/2022 | 09/30/2022 |
| 300571331 | 032 |  | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 5010564.34 | 659816.22 | 509213.05 | Not Available | Not Available |
| 304140033 | 033 |  | &nbsp;&nbsp;&nbsp; OF | Troy | MI | 4544959.95 | 986802.00 | 663457.00 | Not Available | Not Available |
| 304140034 | 034 |  | &nbsp;&nbsp;&nbsp; RT | North Smithfield | RI | 5155000.00 | 401800.00 | 200900.00 | 01/01/2020 | 06/30/2020 |
| 304140035 | 035 |  | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 4771357.22 | 970160.84 | 896439.66 | 01/01/2022 | 09/30/2022 |
| 301461015 | 036 |  | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 4304096.53 | 525700.09 | 137835.53 | Not Available | Not Available |
| 300571328 | 037 |  | &nbsp;&nbsp;&nbsp; RT | Lakeland | FL | 4238356.68 | 732756.63 | 517592.02 | 01/01/2022 | 09/30/2022 |
| 304140038 | 038 |  | &nbsp;&nbsp;&nbsp; MF | Kingsville | TX | 4225643.36 | 542292.69 | 428143.00 | Not Available | Not Available |
| 304140039 | 039 |  | &nbsp;&nbsp;&nbsp; RT | Winston-Salem | NC | 3892767.43 | 379800.00 | 189900.00 | 01/01/2022 | 06/30/2022 |
| 304101396 | 040 |  | &nbsp;&nbsp;&nbsp; RT | Tallahassee | FL | 3114611.08 | 423466.98 | 187757.56 | Not Available | Not Available |
| 304140041 | 041 |  | &nbsp;&nbsp;&nbsp; MU | Mesquite | TX | 3380124.75 | 734836.56 | 381999.89 | 01/01/2022 | 09/30/2022 |
| 304101386 | 042 |  | &nbsp;&nbsp;&nbsp; N/A | Various | Various | 3244093.74 | 405756.13 | 204389.55 | 01/01/2022 | 06/30/2022 |
| 304101387 | 043 |  | &nbsp;&nbsp;&nbsp; OF | Ann Arbor | MI | 3390274.77 | 526343.00 | 405996.60 | 01/01/2022 | 09/30/2022 |
| 304140044 | 044 |  | &nbsp;&nbsp;&nbsp; MF | Cedar Rapids | IA | 3247770.20 | 402742.52 | 258869.69 | 01/01/2022 | 09/30/2022 |
| 304140045 | 045 |  | &nbsp;&nbsp;&nbsp; MF | North Charleston | SC | 2770449.08 | 482814.00 | 264209.00 | Not Available | Not Available |
| 304101407 | 046 |  | &nbsp;&nbsp;&nbsp; LO | Eagle | CO | 2739019.56 | 428154.00 | 394103.00 | Not Available | Not Available |
| 300571326 | 047 |  | &nbsp;&nbsp;&nbsp; SS | Eustis | FL | 2827515.72 | 449170.99 | 381612.08 | 01/01/2022 | 09/30/2022 |
| 304101388 | 049 |  | &nbsp;&nbsp;&nbsp; RT | Dover | OH | 2147490.77 | 376995.14 | 81018.00 | Not Available | Not Available |
| 300571324 | 050 |  | SS | Hammonton | NJ | 2134575.14 | 308914.00 | 92220.09 | Not Available | Not Available |
| Totals | Count: | 47 |  |  |  | 651708872.28 | 105599913.96 | 76824766.28 |  |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 14 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Delinquency Loan Detail*** |

---

---

| | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  | Actual | Paid | Current P&I | Total P&I | Cumulative | Other Expense | Payment | Workout | Most Recent |  |  |  |
| Loan |  | # of Months | Principal | Through | &nbsp;&nbsp; Advances | Advances | Accrued Unpaid | Advances | Status | Strategy | Special Serv | Foreclosure | Bankruptcy | REO |
| Number | OMCR | Delinq | Balance | Date | (Net of ASER) | Outstanding | Interest Advances | Outstanding | (2) | (3) | Transfer Date | Date | Date | Date |
| 304101385 | &nbsp;&nbsp; 001 | 3+ | 100000000.00 | 10/6/21 | 283736.11 | 4176472.14 | 335295.64 | 47148.41 | 3 | 1 | 11/17/21 |  |  |  |
| 304140034 | 034 | <1 | 5155000.00 | 12/1/22 | 18377.58 | 18355.38 | 288.76 | 0.00 | B | 13 | 9/16/20 |  |  |  |
| Totals | &nbsp;&nbsp; Count: | &nbsp;&nbsp; 2 | 105155000.00 |  | 302113.69 | 4194827.52 | 335584.40 | 47148.41 |  |  |  |  |  |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 15 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Historical Delinquency Information*** |

---

---

| | | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution | Less Than 1 Month |  | 1 Month |  | 2 Months |  | 3 Months |  | 4+ Months |  | Bankruptcy |  | Foreclosure |  | REO |  |
| Date | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # | End Sched Bal | # |
| 01/12/2023 | 5155000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.791% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.344% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 12/12/2022 | 2151644.81 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.330% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.325% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 11/14/2022 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.305% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 10/13/2022 | 5155000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.788% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.286% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 09/12/2022 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.266% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 08/12/2022 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.248% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 07/12/2022 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.229% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 06/10/2022 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.210% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 05/12/2022 | 4831920.14 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.734% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 15.191% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 04/12/2022 | 0.00 | 0 | 4314148.14 | 1 | 0.00 | 0 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.654% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 15.167% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 03/11/2022 | 0.00 | 0 | 0.00 | 0 | 5155000.00 | 1 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.000% | 0.0% | 0.781% | 2.1% | 15.149% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |
| 02/11/2022 | 0.00 | 0 | 5155000.00 | 1 | 0.00 | 0 | 100000000.00 | 1 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 |
|  | 0.000% | 0.0% | 0.780% | 2.1% | 0.000% | 0.0% | 15.127% | 2.1% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% | 0.000% | 0.0% |

---

Reports Available at <u> sf.citidirect.com</u> Page 16 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Appraisal Reduction Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  |  |  | Appraisal | Appraisal | Most Recent | Cumulative |
| Loan Number | OMCR | Property Name | Reduction Amount | Reduction Date | ASER Amount | ASER Amount |
| 304101385 | 001 | 135 South LaSalle | 0.00 | 02/06/2022 | 0.00 | 0.00 |
| Totals | 1 |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 |  | 0.00 | 0.00 |

---

Reports Available at <u> sf.citidirect.com</u> Page 17 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Historical Appraisal Reduction Detail*** |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution | Loan |  |  | Appraisal | &nbsp;&nbsp;&nbsp; Appraisal | Most Recent | Cumulative |
| Date | Number | OMCR | Property Name | Reduction Amount | Reduction Date | ASER Amount | ASER Amount |
| 02/11/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 03/11/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 04/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 05/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 06/10/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 07/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 08/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 09/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 10/13/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 11/14/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 12/12/2022 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 01/12/2023 | 304101385 | 001 | &nbsp;&nbsp; 135 South LaSalle | 0.00 | &nbsp;&nbsp;&nbsp; 02/06/2022 | 0.00 | 0.00 |
| 08/12/2020 | 304101397 | 017 | &nbsp;&nbsp; Magnolia Hotel Omaha | 0.00 | &nbsp;&nbsp;&nbsp; 08/06/2020 | 0.00 | 0.00 |
| 09/14/2020 | 304101397 | 017 | &nbsp;&nbsp; Magnolia Hotel Omaha | 0.00 | &nbsp;&nbsp;&nbsp; 08/06/2020 | 0.00 | 0.00 |
| 05/11/2018 | 304140028 | 028 | &nbsp;&nbsp; Infinity Corporate Center | 2799940.38 | &nbsp;&nbsp;&nbsp; 05/07/2018 | 10120.62 | 10120.62 |
| 06/12/2018 | 304140028 | 028 | &nbsp;&nbsp; Infinity Corporate Center | 2799940.38 | &nbsp;&nbsp;&nbsp; 06/06/2018 | 10457.97 | 20578.59 |
| 07/12/2018 | 304140028 | 028 | &nbsp;&nbsp; Infinity Corporate Center | 2799940.38 | &nbsp;&nbsp;&nbsp; 07/06/2018 | 10120.62 | 30699.21 |
| 08/10/2018 | 304140028 | 028 | &nbsp;&nbsp; Infinity Corporate Center | 2799940.38 | &nbsp;&nbsp;&nbsp; 08/06/2018 | 10457.97 | 41157.18 |
| 09/12/2018 | 304140028 | 028 | &nbsp;&nbsp; Infinity Corporate Center | 0.00 |  | 0.00 | 41157.18 |

---

Reports Available at <u> sf.citidirect.com</u> Page 18 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Loan Modification Detail*** |

---

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  |  |  | Modification | Modification | Modification |
| Loan Number | OMCR | Property Name | Date | Type (4) | Description |
| 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| Totals | 1 |  |  |  |  |

---

Reports Available at <u> sf.citidirect.com</u> Page 19 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Historical Loan Modification Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| Distribution | Loan |  |  | Modification | Modification | Modification |
| Date | Number | OMCR | Property Name | Date | Type (4) | Description |
| 05/12/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 06/11/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 07/12/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 08/12/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 09/13/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 10/13/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 11/15/2021 | 304140016 | 016 | Crowne Plaza Bloomington | 5/6/20 | 8 | Other |
| 08/12/2020 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 09/14/2020 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 10/13/2020 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 11/13/2020 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 12/11/2020 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 01/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 02/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 03/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 04/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 05/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 06/11/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 07/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 08/12/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 09/13/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 10/13/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 11/15/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 12/10/2021 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 01/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 02/11/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 03/11/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |

---

Reports Available at <u> sf.citidirect.com</u> Page 20 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Historical Loan Modification Detail*** |

---

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| Distribution | Loan |  |  | Modification | Modification | Modification |
| Date | Number | OMCR | Property Name | Date | Type (4) | Description |
| 04/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 05/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 06/10/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 07/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 08/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 09/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 10/13/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 11/14/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 12/12/2022 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |
| 01/12/2023 | 304101397 | 017 | Magnolia Hotel Omaha | 7/1/20 | 8 | Other |

---

Reports Available at <u> sf.citidirect.com</u> Page 21 of 33© Copyright 2023 Citigroup

------

---

| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Specially Serviced Loan Detail*** |

---

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  | Workout | Most Recent | Most Recent |  |  |  |  |
| &nbsp;&nbsp; Loan |  | Strategy | Inspection | Specially Serviced | Most Recent | Most Recent | Other REO |  |
| Number | OMCR | (3) | Date | Transfer Date | Valuation Date | Value | Property Value | Comment from Special Servicer |
| 304101385 | 001 | 1 |  | 11/17/21 | 1/1/22 | 130000000.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | See the loan supplemental file for comments. |
| 304101397 | 017 | 8 |  | 4/6/20 | 4/20/20 | 13000000.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | See the loan supplemental file for comments. |
| 304140034 | 034 | 13 |  | 9/16/20 | 3/8/15 | 7900000.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | See the loan supplemental file for comments. |
| 304101388 | 049 | 8 |  | 9/19/17 | 10/16/17 | 3360000.00 | 0.00 | See the loan supplemental file for comments. |
| Totals | 4 |  |  |  |  | 154260000.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 |  |

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Reports Available at <u> sf.citidirect.com</u> Page 22 of 33© Copyright 2023 Citigroup

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| | | |
|:---|:---|:---|
| Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** |
| Determination Date: | 01/06/2023 |  |
|  |  | **Commercial Mortgage Pass-Through Certificates** |
|  |  | **Series 2015-GC31** |
|  |  | ***Historical Specially Serviced Loan Detail*** |

---

---

| | | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  | Special | Workout | Special |  |  | Property |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp; Net |  |  |  |
| Distribution | Loan |  | Serviced | Strategy | Serviced | Scheduled | Actual | Type |  | Interest | Note | &nbsp;&nbsp; Operating |  | Maturity |  |
| Date | Number | OMCR | Trans Date | (3) | Loan to MS | Balance | Balance | (1) | State | Rate | Date | Income (NOI) | DSCR | Date | WART |
| 1/12/23 | 304101385 | 001 | 11/17/21 | 1 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -6946657.18 | -2.78% | 5/6/30 | 88 |
| 12/12/22 | 304101385 | 001 | 11/17/21 | 1 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -6946657.18 | -2.78% | 5/6/30 | 89 |
| 11/14/22 | 304101385 | 001 | 11/17/21 | 1 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -4326648.00 | -2.61% | 5/6/30 | 90 |
| 10/13/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -4326648.00 | -2.61% | 5/6/30 | 91 |
| 9/12/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -4326648.00 | -2.61% | 5/6/30 | 92 |
| 8/12/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -4326648.00 | -2.61% | 5/6/30 | 93 |
| 7/12/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -2382048.30 | -2.89% | 5/6/30 | 94 |
| 6/10/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | -2382048.30 | -2.89% | 5/6/30 | 95 |
| 5/12/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 96 |
| 4/12/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 97 |
| 3/11/22 | 304101385 | 001 | 11/17/21 | 10 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 98 |
| 2/11/22 | 304101385 | 001 | 11/17/21 | 13 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 99 |
| 1/12/22 | 304101385 | 001 | 11/17/21 | 13 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 100 |
| 12/10/21 | 304101385 | 001 | 11/17/21 | 13 |  | 100000000.00 | 100000000.00 | 17 | IL | 3.295% |  | 6916425.88 | 2.76% | 5/6/30 | 101 |
| 1/12/23 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2147490.77 | 2147490.77 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 28 |
| 12/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2151644.81 | 2156062.45 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 29 |
| 11/14/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2156062.45 | 2156062.45 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 30 |
| 10/13/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2160181.93 | 2160181.93 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 31 |
| 9/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2164566.27 | 2164566.27 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 32 |
| 8/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2168651.48 | 2168651.48 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 33 |
| 7/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2172720.22 | 2172720.22 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 34 |
| 6/10/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2177055.64 | 2177055.64 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 35 |
| 5/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2181090.50 | 2181090.50 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 36 |
| 4/12/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2185393.26 | 2185393.26 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 37 |
| 3/11/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2189394.51 | 2189394.51 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 38 |
| 2/11/22 | 304101388 | 049 | 9/19/17 | 8 | 4/25/18 | 2194235.58 | 2194235.58 | 12 | OH | 4.700% |  | 81018.00 | 2.10% | 5/6/25 | 39 |

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Reports Available at <u> sf.citidirect.com</u> Page 23 of 33© Copyright 2023 Citigroup

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| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |
| Determination Date: | Determination Date: | &nbsp;&nbsp;&nbsp; 01/06/2023 | &nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |  |
|  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** |  |  |  |
|  |  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp; 1/12/22 | 304101388 | 049 | 9/19/17 | 8 4/25/18 | 2198201.19 | &nbsp;&nbsp;&nbsp; 2198201.19 | 12 | OH | 4.700% | 81018.0 | 2.1% | 5/6/25 |

---

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  |  |  |  |  |  |  |  |  |  | 40.0 |
| 12/10/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2202150.82 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 41.0 |
| 11/15/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2206371.42 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 42.0 |
| 10/13/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2210288.11 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 43.0 |
| 9/13/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2214476.96 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 44.0 |
| 8/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2218360.98 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 45.0 |
| 7/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2222229.34 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 46.0 |
| 6/11/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2226371.6 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 47.0 |
| 5/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2230207.67 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 48.0 |
| 4/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2234318.81 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 49.0 |
| 3/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2238122.85 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 50.0 |
| 2/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2242786.44 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 51.0 |
| 1/12/21 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2246556.35 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 52.0 |
| 12/11/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2250311.06 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 53.0 |
| 11/13/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2254343.77 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 54.0 |
| 10/13/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2258067.09 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 55.0 |
| 9/14/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2262069.54 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 56.0 |
| 8/12/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2265761.72 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 57.0 |
| 7/10/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2269439.02 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 58.0 |
| 6/12/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2273397.1 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 59.0 |
| 5/12/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2277043.62 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 60.0 |
| 4/10/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2280972.03 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 61.0 |
| 3/12/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2284588.01 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 62.0 |
| 2/12/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2288784.64 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 63.0 |
| 1/10/20 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2292369.13 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 64.0 |
| 12/12/19 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2295939.17 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 65.0 |
| 11/13/19 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2299793.86 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 66.0 |
| 10/11/19 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2303333.98 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 67.0 |
| 9/12/19 | 304101388.0 | 49.0 | 9/19/17 | 8 4/25/18 | 2307159.82 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 68.0 |
| 8/12/19 | 304101388.0 | 49.0 |  | 8 4/25/18 | 2310670.24 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 69.0 |
| 7/12/19 | 304101388.0 | 49.0 |  | 8 4/25/18 | 2314166.51 | 12.0 | OH | 4.7% | 81018.0 | 2.1% | 5/6/25 | 70.0 |

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Reports Available at <u> sf.citidirect.com</u> Page 24 of 33© Copyright 2023 Citigroup

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| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |
| Determination Date: | Determination Date: | &nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |
|  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Commercial Mortgage Pass-Through Certificates** |  |  |
|  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp; 6/12/19 | 304101388 | 049 | 8 4/25/18 | 2317950.09 | &nbsp;&nbsp;&nbsp; 2317950.09 | 12 | OH | 4.700% | 81018.0 | 2.1% |
| &nbsp;&nbsp;&nbsp;&nbsp; 5/10/19 | 304101388 | 049 | 8 4/25/18 | 2321417.02 | &nbsp;&nbsp;&nbsp; 2321417.02 | 12 | OH | 4.700% | 68680.0 | 1.78% |

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| | | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  |  |  |  |  |  |  |  |  |  |  |  |  | 5/6/25 | 71 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | 5/6/25 | 72 |
| 4/12/19 | 304101388 | 049 |  | 8 | 4/25/18 | 2325172.32 | 2325172.32 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 73 |
| 3/12/19 | 304101388 | 049 |  | 8 | 4/25/18 | 2328610.14 | 2328610.14 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 74 |
| 2/12/19 | 304101388 | 049 |  | 8 | 4/25/18 | 2332944.15 | 2332944.15 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 75 |
| 1/11/19 | 304101388 | 049 |  | 8 | 4/25/18 | 2336350.64 | 2339743.40 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 76 |
| 12/12/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2339743.40 | 2339743.40 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 77 |
| 11/13/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2343427.20 | 2343427.20 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 78 |
| 10/15/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2346791.43 | 2346791.43 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 79 |
| 9/12/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2350447.73 | 2350447.73 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 80 |
| 8/10/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2353783.66 | 2353783.66 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 81 |
| 7/12/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2357106.15 | 2357106.15 | 12 | OH | 4.700% | 68680.00 | 1.78% | 5/6/25 | 82 |
| 6/12/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2360722.21 | 2360722.21 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 83 |
| 5/11/18 | 304101388 | 049 |  | 8 | 4/25/18 | 2364016.73 | 2364016.73 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 84 |
| 4/12/18 | 304101388 | 049 | 9/19/17 | 9 |  | 2367605.83 | 2367605.83 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 85 |
| 3/12/18 | 304101388 | 049 | 9/19/17 | 13 |  | 2370872.60 | 2378289.43 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 86 |
| 2/12/18 | 304101388 | 049 | 9/19/17 | 13 |  | 2375052.68 | 2378289.43 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 87 |
| 1/12/18 | 304101388 | 049 | 9/19/17 | 13 |  | 2378289.43 | 2378289.43 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 88 |
| 12/12/17 | 304101388 | 049 | 9/19/17 | 13 |  | 2381513.14 | 2385033.98 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 89 |
| 11/10/17 | 304101388 | 049 | 9/19/17 | 13 |  | 2385033.98 | 2391725.13 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 90 |
| 10/13/17 | 304101388 | 049 | 9/19/17 | 13 |  | 2388230.50 | 2391725.13 | 12 | OH | 4.700% | 284645.00 | 2.46% | 5/6/25 | 91 |
| 1/12/23 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9882925.24 | 9882925.23 | 19 | NB | 4.410% | 2169430.49 | 3.22% | 6/6/25 | 29 |
| 12/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9901475.79 | 9901475.78 | 19 | NB | 4.410% | 2169430.49 | 3.22% | 6/6/25 | 30 |
| 11/14/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9921166.90 | 9921166.89 | 19 | NB | 4.410% | 2169430.49 | 3.22% | 6/6/25 | 31 |
| 10/13/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9939572.77 | 9939572.76 | 19 | NB | 4.410% | 1480029.88 | 2.20% | 6/6/25 | 32 |
| 9/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9959124.39 | 9959124.38 | 19 | NB | 4.410% | 1480029.88 | 2.20% | 6/6/25 | 33 |
| 8/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9977386.66 | 9977386.65 | 19 | NB | 4.410% | 1480029.88 | 2.20% | 6/6/25 | 34 |
| 7/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 9995579.85 | 9995579.84 | 19 | NB | 4.410% | 1075249.40 | 1.73% | 6/6/25 | 35 |
| 6/10/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10014926.40 | 10014926.39 | 19 | NB | 4.410% | 1075249.40 | 1.73% | 6/6/25 | 36 |
| 5/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10032977.57 | 10032977.57 | 19 | NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 37 |
| 4/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10269612.31 | 10269612.31 | 19 | NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 38 |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 25 of 33 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 25 of 33 |  |  |  |© Copyright 2023 Citigroup |© Copyright 2023 Citigroup |  |

---

------

---

| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp; 01/12/2023 |  | &nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** | &nbsp;&nbsp;&nbsp;&nbsp; **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |  |
| Determination Date: | Determination Date: | &nbsp;&nbsp;&nbsp; 01/06/2023 | &nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |  |  |
| **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |
|  |  |  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |  |
| 3/11/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10286699.97 | 10286699.97 | 19 NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 39 |
| 2/11/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10307496.66 | 10307496.66 | 19 NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 40 |
| 1/12/22 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10324441.00 | 10324441.00 | 19 NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 41 |
| 12/10/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10341321.23 | 10341321.23 | 19 NB | 4.410% | 891015.70 | 1.72% | 6/6/25 | 42 |
| 11/15/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10359401.83 | 10359401.83 | 19 NB | 4.410% | 990980.65 | 1.47% | 6/6/25 | 43 |
| 10/13/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10376149.80 | 10376149.80 | 19 NB | 4.410% | 990980.65 | 1.47% | 6/6/25 | 44 |
| 9/13/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10394102.87 | 10394102.87 | 19 NB | 4.410% | 990980.65 | 1.47% | 6/6/25 | 45 |
| 8/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10410719.56 | 10410719.56 | 19 NB | 4.410% | 990980.65 | 1.47% | 6/6/25 | 46 |
| 7/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10427273.39 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 47 |
| 6/11/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 48 |
| 5/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 49 |
| 4/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 50 |
| 3/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 51 |
| 2/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 52 |
| 1/12/21 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 53 |
| 12/11/20 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 491327.00 | 0.73% | 6/6/25 | 54 |
| 11/13/20 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 736710.00 | 1.09% | 6/6/25 | 55 |
| 10/13/20 | 304101397 | 017 | 4/6/20 | 8 | 9/2/20 | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 736710.00 | 1.09% | 6/6/25 | 56 |
| 9/14/20 | 304101397 | 017 | 4/6/20 | 1 |  | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 57 |
| 8/12/20 | 304101397 | 017 | 4/6/20 | 1 |  | 10410719.56 | 10445039.27 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 58 |
| 7/10/20 | 304101397 | 017 | 4/6/20 | 98 |  | 10427273.39 | 10445039.27 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 59 |
| 6/12/20 | 304101397 | 017 | 4/6/20 | 98 |  | 10445039.27 | 10445039.27 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 60 |
| 5/12/20 | 304101397 | 017 | 4/6/20 | 13 |  | 10461463.26 | 10461463.26 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 61 |
| 4/10/20 | 304101397 | 017 | 4/6/20 | 13 |  | 10479103.95 | 10495399.07 | 19 NB | 4.410% | 1728713.00 | 2.57% | 6/6/25 | 62 |
| 11/15/21 | 304140016 | 016 | 2/4/21 | 6 |  | 0.00 | 0.00 | 19 MN | 4.650% | -816086.00 | -1.88% | 2/6/25 | 39 |
| 10/13/21 | 304140016 | 016 | 2/4/21 | 6 |  | 10840353.25 | 10840353.25 | 19 MN | 4.650% | -816086.00 | -1.88% | 2/6/25 | 40 |
| 9/13/21 | 304140016 | 016 | 2/4/21 | 6 |  | 10861430.72 | 10881026.79 | 19 MN | 4.650% | -536650.00 | -2.48% | 2/6/25 | 41 |
| 8/12/21 | 304140016 | 016 | 2/4/21 | 6 |  | 10881026.79 | 10921389.82 | 19 MN | 4.650% | -536650.00 | -2.48% | 2/6/25 | 42 |
| 7/12/21 | 304140016 | 016 | 2/4/21 | 2 |  | 10900544.70 | 10921389.82 | 19 MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 43 |
| 6/11/21 | 304140016 | 016 | 2/4/21 | 2 |  | 10921389.82 | 10940746.76 | 19 MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 44 |
| 5/12/21 | 304140016 | 016 | 2/4/21 | 2 |  | 10940746.76 | 11004001.62 | 19 MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 45 |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 26 of 33 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 26 of 33 |  |  |© Copyright 2023 Citigroup |© Copyright 2023 Citigroup |  |

---

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---

| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp; 01/12/2023 |  | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |  |
| Determination Date: | Determination Date: | &nbsp;&nbsp;&nbsp; 01/06/2023 | &nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |  |  |
| **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |
|  |  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |  |
| 4/12/21 | 304140016 | 016 | 2/4/21 | 2 | 10961436.70 | 11004001.62 | 19 | MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 46 |
| 3/12/21 | 304140016 | 016 | 2/4/21 | 6 | 10980633.92 | 11004001.62 | 19 | MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 47 |
| 2/12/21 | 304140016 | 016 | 2/4/21 | 6 | 11004001.62 | 11041980.66 | 19 | MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 48 |
| 1/12/21 | 304140016 | 016 | 11/6/20 | 6 | 11023029.08 | 11041980.66 | 19 | MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 49 |
| 12/11/20 | 304140016 | 016 | 11/6/20 | 98 | 11041980.66 | 11062279.84 | 19 | MN | 4.650% | 624888.00 | 0.77% | 2/6/25 | 50 |
| 9/12/18 | 304140028 | 028 | 9/19/17 | 8 | 0.00 | 0.00 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 80 |
| 8/10/18 | 304140028 | 028 | 9/19/17 | 2 | 5924901.16 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 81 |
| 7/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5933247.11 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 82 |
| 6/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5942281.96 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 83 |
| 5/11/18 | 304140028 | 028 | 9/19/17 | 2 | 5950562.60 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 84 |
| 4/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5959534.48 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 85 |
| 3/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5967750.30 | 5986255.08 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 86 |
| 2/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5978109.06 | 5994370.49 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 87 |
| 1/12/18 | 304140028 | 028 | 9/19/17 | 2 | 5986255.08 | 5994370.49 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 88 |
| 12/12/17 | 304140028 | 028 | 9/19/17 | 2 | 5994370.49 | 6003183.05 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 89 |
| 11/10/17 | 304140028 | 028 | 9/19/17 | 2 | 6003183.05 | 6011234.86 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 90 |
| 10/13/17 | 304140028 | 028 | 9/19/17 | 13 | 6011234.86 | 6019986.09 | 17 | OH | 4.380% | 397792.00 | 2.16% | 5/6/25 | 91 |
| 1/12/23 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 29 |
| 12/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 30 |
| 11/14/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 31 |
| 10/13/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 32 |
| 9/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 33 |
| 8/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 34 |
| 7/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 35 |
| 6/10/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 36 |
| 5/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 37 |
| 4/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 38 |
| 3/11/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 39 |
| 2/11/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 40 |
| 1/12/22 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 41 |
| 12/10/21 | 304140034 | 034 | 9/16/20 | 13 | 5155000.00 | 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 42 |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 27 of 33 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 27 of 33 |  |  |  |© Copyright 2023 Citigroup |© Copyright 2023 Citigroup |  |

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---

| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | &nbsp;&nbsp;&nbsp; 01/12/2023 | &nbsp;&nbsp;&nbsp; 01/12/2023 |  | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |  |
| Determination Date: | Determination Date: | &nbsp;&nbsp;&nbsp; 01/06/2023 | &nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |  |  |
| **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |
|  |  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |  |
| 11/15/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 43 |
| 10/13/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 44 |
| 9/13/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 45 |
| 8/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 46 |
| 7/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 47 |
| 6/11/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 48 |
| 5/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 49 |
| 4/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 50 |
| 3/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 51 |
| 2/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 52 |
| 1/12/21 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 53 |
| 12/11/20 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 54 |
| 11/13/20 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 55 |
| 10/13/20 | 304140034 | 034 | 9/16/20 | 13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5155000.00 | &nbsp;&nbsp;&nbsp; 5155000.00 | 12 | RI | 4.140% | 200900.00 | 1.85% | 6/1/25 | 56 |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 28 of 33 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 28 of 33 |  |  |  |© Copyright 2023 Citigroup |© Copyright 2023 Citigroup |  |

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------

---

| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: |  | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |
| Determination Date: | Determination Date: |  | 01/06/2023 |  |  |  |  |  |  |  |
|  |  |  |  |  | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |  |  |  |
|  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |
|  |  |  |  |  | ***Unscheduled Principal Detail*** | ***Unscheduled Principal Detail*** | ***Unscheduled Principal Detail*** |  |  |  |
|  |  |  | Liquidation / | Liquid / Prepay | Unscheduled | Unscheduled | Other | Prepayment Interest | Prepayment | Yield Maintenance |
| Loan Number | OMCR | OMCR | Prepayment Date | Type (5) | Principal Collections | Principal Adjustments | Interest Adjustments | Excess / (Shortfall) | Penalties | Penalties |
|  |  |  |  | ***There is no unscheduled principal activity for the current distribution period.*** | ***There is no unscheduled principal activity for the current distribution period.*** | ***There is no unscheduled principal activity for the current distribution period.*** | ***There is no unscheduled principal activity for the current distribution period.*** | ***There is no unscheduled principal activity for the current distribution period.*** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals |  |  |  |  |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp; Reports Available at | &nbsp;&nbsp;&nbsp; Reports Available at | sf.citidirect.com | sf.citidirect.com |  |  | Page 29 of 33 |  |  |© Copyright | 2023 Citigroup |

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| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | 01/12/2023 | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |
| Determination Date: | Determination Date: | 01/06/2023 | 01/06/2023 |  |  |  |  |  |  |  |
|  |  |  |  | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |  |  |  |
|  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |
|  |  |  |  |  | ***Historical Unscheduled Principal Detail*** | ***Historical Unscheduled Principal Detail*** | ***Historical Unscheduled Principal Detail*** |  |  |  |
| &nbsp;&nbsp;&nbsp; Distribution | Loan |  | Liquidation / | Liquid / Prepay | Unscheduled | Unscheduled | Other | Prepayment Interest | Prepayment | Yield Maintenance |
| Date | Number | OMCR | Prepayment Date | Type (5) | Principal Collections | Principal Adjustments | Interest Adjustments | Excess / (Shortfall) | Penalties | Penalties |
| 11/15/21 | 304140016 | 016 | 10/15/21 | 9 | 10820594.32 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 1973242.03 |
| &nbsp;&nbsp;&nbsp; 5/12/22 | 304101397 | 017 | 8/6/21 | 1 | 218224.17 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 |
| &nbsp;&nbsp;&nbsp; 9/14/20 | 304101397 | 017 |  | 0 | (34319.71) | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 |
| &nbsp;&nbsp;&nbsp; 9/12/18 | 304140028 | 028 | 8/28/18 | 3 | 4822832.84 | 1093690.89 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 |
| &nbsp;&nbsp;&nbsp; 9/13/21 | 304101372 | 048 | 8/27/21 | 9 | 2333597.23 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 0.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 | 72353.89 |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  | Page 30 of 33 |  |  |© Copyright 2023 Citigroup |© Copyright 2023 Citigroup |

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| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 01/12/2023 |  | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |  |
| Determination Date: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 01/06/2023 |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |  |  |  |  |
|  |  |  |  |  | **Series 2015-GC31** | **Series 2015-GC31** |  |  |  |  |  |  |
| ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** | ***Liquidated Loan Detail*** |
| &nbsp;&nbsp;&nbsp;&nbsp; Loan | Final Recovery | Most Recent | Most Recent | Actual | Gross | Proceeds | Liquidation | Net Liquidation | Net Proceeds | Realized | Realized | Repurchased by |
| Number OMCR | Determ Date | Appraisal Date | Appraisal Value | Balance | Proceeds | as % of Act Bal | Expenses | Proceeds | as a % of Act Bal |  | Losses | Seller (Y/N) |
| ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** | ***There is no liquidated loan activity for the current distribution period.*** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Totals |  |  |  |  |  |  |  |  |  |  |  |  |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  |  | Page 31 of 33 | Page 31 of 33 |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;© Copyright | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;© Copyright | 2023 Citigroup | 2023 Citigroup |

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| | | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | 01/12/2023 | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |  |
| Determination Date: | Determination Date: | 01/06/2023 | 01/06/2023 |  |  |  |  |  |  |  |  |  |  |
| **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |
| **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** | **Series 2015-GC31** |
| ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** | ***Historical Liquidated Loan Detail*** |
| &nbsp;&nbsp;&nbsp; Distribution | Loan |  | Final Recovery | Most Recent | &nbsp;&nbsp; Most Recent | Actual | Gross | Gross Proceeds | Liquidation | Net Liquidation | Net Proceeds | Realized | Repurchased by |
| Date | Number | OMCR | Determ Date | Appraisal Date | Appraisal Value | Balance | Proceeds | as % of Act Bal | Expenses | Proceeds | as a % of Act Bal Loss | as a % of Act Bal Loss | Seller (Y/N) |
| &nbsp;&nbsp;&nbsp; 8/12/22 | 304140016 | &nbsp;&nbsp; 016 |  |  | 0.00 | 0.00 | 0.00 | 0.00 | 2237894.10 | 13078247.35 | 0.00 | 0.00 |  |
| &nbsp;&nbsp;&nbsp; 11/15/21 | 304140016 | &nbsp;&nbsp; 016 |  | 12/1/14 | 31900000.00 | 0.00 | 10840353.25 | 0.00 | 2237894.10 | 13078247.35 | 0.00 | 0.00 |  |
| &nbsp;&nbsp;&nbsp; 8/12/19 | 304140028 | &nbsp;&nbsp; 028 |  |  | 0.00 | 0.00 | 0.00 | 0.00 | 569590.04 | 5400800.31 | 0.00 | 0.00 |  |
| &nbsp;&nbsp;&nbsp; 9/12/18 | 304140028 | &nbsp;&nbsp; 028 |  | 10/12/17 | 3875000.00 | 0.00 | 5924901.16 | 0.00 | 569590.04 | 5400800.31 | 0.00 | 1093690.89 |  |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  |  | Page 32 of 33 |  |  |  | &nbsp;&nbsp;&nbsp;&nbsp;© Copyright 2023 Citigroup | &nbsp;&nbsp;&nbsp;&nbsp;© Copyright 2023 Citigroup | &nbsp;&nbsp;&nbsp;&nbsp;© Copyright 2023 Citigroup |

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| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Distribution Date: | Distribution Date: | 01/12/2023 | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** | **Citigroup Commercial Mortgage Trust 2015-GC31** |  |  |  |
| Determination Date: | Determination Date: | 01/06/2023 |  |  |  |  |  |  |
|  |  |  | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** | **Commercial Mortgage Pass-Through Certificates** |  |  |  |
|  |  |  |  |  | **Series 2015-GC31** |  |  |  |
|  |  |  |  |  | ***CREFC® Legends*** |  |  |  |
| **(1) Property Type** | **(1) Property Type** |  | **(3) Workout Strategy** | **(3) Workout Strategy** | **(3) Workout Strategy** | **(5) Liquidation / Prepayment Type** | **(5) Liquidation / Prepayment Type** | **(5) Liquidation / Prepayment Type** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MF = Multifamily | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MF = Multifamily |  | 1 | . | Modification | 1 | . | Partial Liquidation (Curtailment) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RT = Retail | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RT = Retail |  | 2 | . | Foreclosure | 2 | . | Payoff Prior To Maturity |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HC = HealthCare | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HC = HealthCare |  | 3 | . | Bankruptcy | 3 | . | Disposition / Liquidation |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IN = Industrial | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IN = Industrial |  | 4 | . | Extension | 4 | . | Repurchase / Substitution |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; WH = Warehouse | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; WH = Warehouse |  | 5 | . | Note Sale | 5 | . | Full Payoff At Maturity |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MH = Mobile Home Park | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MH = Mobile Home Park |  | 6 | . | DPO | 6 | . | DPO |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OF = Office | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OF = Office |  | 7 | . | REO | 7 | . | Liquidation prior to 7/1/2006 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MU = Mixed Use | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MU = Mixed Use |  | 8 | . | Resolved | 8 | . | Payoff With Penalty |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LO = Lodging | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LO = Lodging |  | 9 | . | Pending Return to Master Servicer | 9 | . | Payoff With Yield Maintenance |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SS = Self Storage | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SS = Self Storage |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10. Deed In Lieu of Foreclosure | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10. Deed In Lieu of Foreclosure | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10. Deed In Lieu of Foreclosure | 10. Curtailment With Penalty | 10. Curtailment With Penalty | 10. Curtailment With Penalty |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OT = Other | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OT = Other |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11. Full Payoff | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11. Full Payoff | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11. Full Payoff | 11. Curtailment With Yield Maintenance | 11. Curtailment With Yield Maintenance | 11. Curtailment With Yield Maintenance |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SE = Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SE = Securities |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12. Reps and Warranties | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12. Reps and Warranties | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12. Reps and Warranties |  |  |  |
| CH = Cooperative Housing | CH = Cooperative Housing | CH = Cooperative Housing | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 13. Other or TBD | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 13. Other or TBD | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 13. Other or TBD |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N/A = Not Available | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N/A = Not Available |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 98. Not Provided By Servicer | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 98. Not Provided By Servicer | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 98. Not Provided By Servicer |  |  |  |
| **(2) Payment Status** | **(2) Payment Status** | **(2) Payment Status** | **(4) Modification Type** | **(4) Modification Type** | **(4) Modification Type** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A. | In Grace Period |  | 1 | . | Maturity Date Extension |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B. | Late, but less than 30 Days | Late, but less than 30 Days | 2 | . | Amortization Change |  |  |  |
| 0 | Current |  | 3 | . | Principal Write-Off |  |  |  |
| 1 | 30-59 Days Delinquent | 30-59 Days Delinquent | 4 | . | Blank (formerly Combination) |  |  |  |
| 2 | 60-89 Days Delinquent | 60-89 Days Delinquent | 5 | . | Temporary Rate Reduction |  |  |  |
| 3 | 90-120 Days Delinquent | 90-120 Days Delinquent | 6 | . | Capitalization of Interest |  |  |  |
| 4 | Performing Matured Balloon | Performing Matured Balloon | 7 | . | Capitalization of Taxes |  |  |  |
| 5 | Non Performing Matured Balloon | Non Performing Matured Balloon | 8 | . | Other |  |  |  |
| 6. 121+ Days Delinquent | 6. 121+ Days Delinquent | 6. 121+ Days Delinquent | 9 | . | Combination |  |  |  |
| Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com | Reports Available at sf.citidirect.com |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Page 33 of 33 |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;© Copyright 2023 Citigroup |

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