| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STATEMENT TO NOTEHOLDERS |
| July 11, 2025 |
| TRANSACTION PARTIES | ||
| Depositor: | Citigroup Commercial Mortgage Securities Inc. | |
| Master Servicer: | Wells Fargo Bank, National Association | |
| Certificate Administrator: | Citibank, N.A. | |
| Trustee: | Deutsche Bank Trust Company Americas | |
| Special Servicer: | Torchlight Loan Services, LLC | |
| Operating Advisor: | Pentalpha Surveillance LLC. | |
| Danny Lee | Citibank, Agency and Trust | |
| (212) 816-4936 | 388 Greenwich Street Trading, 4th Floor | |
| danny1.lee@citi.com | New York, NY 10013 | |
| TABLE OF CONTENTS | |||
| 1 | . | Distribution Summary | 2 |
| 1.1 | . | Summary | 2 |
| 1.2 | . | Factors | 3 |
| 2 | . | Distribution Detail | 4 |
| 2.1 | . | Interest Detail | 4 |
| 2.2 | . | Interest Shortfall Detail | 5 |
| 2.3 | . | Principal Detail | 6 |
| 3 | . | Reconciliation Detail | 7 |
| 4 | . | Other Information | 8 |
| 5 | . | Stratification Detail | 9 |
| 6 | . | Mortgage Loan Detail | 14 |
| 7 | . | NOI Detail | 15 |
| 8 | . | Delinquency Loan Detail | 16 |
| 9 | . | Collateral Performance Delinquency and Loan Status Detail | 17 |
| 10 | . | Appraisal Reduction Detail | 18 |
| 11 | . | Historical Appraisal Reduction Detail | 19 |
| 12 | . | Loan Modification Detail | 21 |
| 13 | . | Historical Loan Modification Detail | 22 |
| 14 | . | Specially Serviced Loan Detail | 25 |
| 15 | . | Historical Specially Serviced Loan Detail | 26 |
| 16 | . | Unscheduled Principal Detail | 31 |
| 17 | . | Historical Unscheduled Principal Detail | 32 |
| 18 | . | Liquidated Loan Detail | 34 |
| 19 | . | Historical Liquidated Loan Detail | 35 |
| 20 | . | CREFC Investor Reporting Package Legends | 36 |
| 21 | . | Notes | 37 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 1 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DISTRIBUTION SUMMARY |
| July 11, 2025 |
| Accretion | |||||||||||||
| & | |||||||||||||
| Non-Cash | |||||||||||||
| Accrual | Other | Balance | |||||||||||
| Original | Prior | Pass-Through | Day | Interest | (As Interest) | Principal | Total | Realized Loss | Increase/ | Current | |||
| Class | Balance | Balance | Rate | Count | Distributed | Distributed | Distributed | Distributed | /(Recovery) | (Decrease) | Balance | ||
| Class A-1 | 28,330,000.00 | - | 1.637000 | % | 30/360 | - | - | - | - | - | - | - | |
| Class A-2 | 2,298,000.00 | - | 3.084000 | % | 30/360 | - | - | - | - | - | - | - | |
| Class A-3 | 160,000,000.00 | - | 3.497000 | % | 30/360 | - | - | - | - | - | - | - | |
| Class A-4 | 268,724,000.00 | 102,265,492.27 | 3.762000 | % | 30/360 | 320,602.32 | - | 22,881,223.44 | 23,201,825.76 | - | - | 79,384,268.83 | |
| Class A-AB | 46,974,000.00 | - | 3.431000 | % | 30/360 | - | - | - | - | - | - | - | |
| Class A-S | 58,763,000.00 | 58,763,000.00 | 3.813476 | % | 30/360 | 186,742.73 | - | - | 186,742.73 | - | - | 58,763,000.00 | |
| Class B | 42,871,000.00 | 42,871,000.00 | 3.814476 | % | 30/360 | 61,906.18 | - | - | 61,906.18 | - | - | 42,871,000.00 | |
| Class C | 33,852,000.00 | 33,852,000.00 | 3.814476 | % | 30/360 | - | - | - | - | - | - | 33,852,000.00 | |
| Class D | 24,284,000.00 | 24,284,000.00 | 3.814476 | % | 30/360 | - | - | - | - | - | - | 24,284,000.00 | |
| Class E | 11,000,000.00 | 11,000,000.00 | 3.814476 | % | 30/360 | - | - | - | - | - | - | 11,000,000.00 | |
| Class F | 14,864,000.00 | 10,040,471.16 | 3.814476 | % | 30/360 | - | - | - | - | - | - | 10,040,471.16 | |
| Class G | 12,231,000.00 | - | 3.814476 | % | 30/360 | - | - | - | - | - | - | - | |
| Class H | 19,132,869.00 | - | 3.814476 | % | 30/360 | - | - | - | - | - | - | - | |
| Class S | - | - | 0.000000 | % | 30/360 | - | - | - | - | - | - | - | |
| Class R | - | - | 0.000000 | % | 30/360 | - | - | - | - | - | - | - | |
| Total | 723,323,869.00 | 283,075,963.43 | 569,251.23 | - | 22,881,223.44 | 23,450,474.67 | - | - | 260,194,739.99 | ||||
| Notional | |||||||||||||
| Class X-A | 565,089,000.00 | 161,028,492.27 | 0.033691 | % | 30/360 | 4,521.02 | - | - | 4,521.02 | - | (22,881,223.44 | ) | 138,147,268.83 |
| Grand Total | 1,288,412,869.00 | 444,104,455.70 | 573,772.25 | - | 22,881,223.44 | 23,454,995.69 | - | (22,881,223.44 | ) | 398,342,008.82 | |||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 2 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DISTRIBUTION SUMMARY - FACTORS |
| July 11, 2025 |
| Accretion | ||||||||||
| & | ||||||||||
| Non-Cash | ||||||||||
| Other | Balance | |||||||||
| Record | Interest | (As Interest) | Principal | Total | Realized Loss | Increase/ | Current | |||
| Class | CUSIP | Date | Distributed | Distributed | Distributed | Distributed | /(Recovery) | (Decrease) | Balance | |
| Class A-1 | 17323 | YAA7 | 06/30/2025 | - | - | - | - | - | - | - |
| Class A-2 | 17323 | YAB5 | 06/30/2025 | - | - | - | - | - | - | - |
| Class A-3 | 17323 | YAC3 | 06/30/2025 | - | - | - | - | - | - | - |
| Class A-4 | 17323 | YAD1 | 06/30/2025 | 1.19305429 | - | 85.14767360 | 86.34072788 | - | - | 295.41190526 |
| Class A-AB | 17323 | YAE9 | 06/30/2025 | - | - | - | - | - | - | - |
| Class A-S | 17323 | YAF6 | 06/30/2025 | 3.17789647 | - | - | 3.17789647 | - | - | 1,000.00000000 |
| Class X-A | 17323 | YAL3 | 06/30/2025 | 0.00800055 | - | - | 0.00800055 | - | - | 244.46993098 |
| Class B | 17323 | YAG4 | 06/30/2025 | 1.44401064 | - | - | 1.44401064 | - | - | 1,000.00000000 |
| Class C | 17323 | YAH2 | 06/30/2025 | - | - | - | - | - | - | 1,000.00000000 |
| Class D | 17323 | YAJ8 | 06/30/2025 | - | - | - | - | - | - | 1,000.00000000 |
| Class E | 17323 | YAN9 | 06/30/2025 | - | - | - | - | - | - | 1,000.00000000 |
| Class F | 17323 | YAQ2 | 06/30/2025 | - | - | - | - | - | - | 675.48917922 |
| Class G | 17323 | YAS8 | 06/30/2025 | - | - | - | - | - | - | - |
| Class H | 17323 | YAU3 | 06/30/2025 | - | - | - | - | - | - | - |
| Class S | 17323 | YAW9 | 06/30/2025 | - | - | - | - | - | - | - |
| Class R | 17323 | YAY5 | 06/30/2025 | - | - | - | - | - | - | - |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 3 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DISTRIBUTION INFORMATION - INTEREST DETAIL |
| July 11, 2025 |
| Rate | Interest | Shortfall | Paid | |||||||||||||
| Cap | ||||||||||||||||
| Accrual | Net | Accreted | Non | Carry | Cap Carryover | Carryover | ||||||||||
| Class | Uncapped Capped | Next | Dates | Accrued | /Deferred | Recovered | Forward | /Basis Risk | Accrued | Carry Forward /Basis Risk | Total | |||||
| Class A-1 | 1.63700 | % | 1.63700 | % | 1.63700 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Class A-2 | 3.08400 | % | 3.08400 | % | 3.08400 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Class A-3 | 3.49700 | % | 3.49700 | % | 3.49700 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Class A-4 | 3.76200 | % | 3.76200 | % | 3.76200 | % | 06/01-06/30 | 320,602.32 | - | - | - | - | 320,602.32 | - | - | 320,602.32 |
| Class A-AB | 3.43100 | % | 3.43100 | % | 3.43100 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Class A-S | 3.81348 | % | 3.81348 | % | 3.81348 | % | 06/01-06/30 | 186,742.73 | - | - | - | - | 186,742.73 | - | - | 186,742.73 |
| Class B | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | 136,275.33 | - | - | 74,573.91 | - | 61,906.18 | - | - | 61,906.18 |
| Class C | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | 107,606.36 | - | - | 109,747.06 | - | - | - | - | - |
| Class D | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | 77,192.27 | - | - | 81,235.37 | - | - | - | - | - |
| Class E | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | 34,966.03 | - | - | 36,913.75 | - | - | - | - | - |
| Class F | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | 31,915.94 | - | - | 34,515.45 | - | - | - | - | - |
| Class G | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | - | - | - | 3,718.09 | - | - | - | - | - |
| Class H | 3.81448 | % | 3.81448 | % | 3.81448 | % | 06/01-06/30 | - | - | - | 7,303.67 | - | - | - | - | - |
| Class S | 0.00000 | % | 0.00000 | % | 0.00000 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Class R | 0.00000 | % | 0.00000 | % | 0.00000 | % | 06/01-06/30 | - | - | - | - | - | - | - | - | - |
| Total | 895,300.98 | - | - | 348,007.30 | - | 569,251.23 | - | - | 569,251.23 | |||||||
| Notional | ||||||||||||||||
| Class X-A | 0.03369 | % | 0.03369 | % | 0.03369 | % | 06/01-06/30 | 4,521.02 | - | - | - | - | 4,521.02 | - | - | 4,521.02 |
| Total | 4,521.02 | - | - | - | - | 4,521.02 | - | - | 4,521.02 | |||||||
| Grand Total | 899,822.00 | - | - | 348,007.30 | - | 573,772.25 | - | - | 573,772.25 | |||||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 4 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DISTRIBUTION INFORMATION - INTEREST SHORTFALL DETAIL |
| July 11, 2025 |
| Cap Carryover / | |||||||||||||
| Non-Recov Shortfall | Carry Forward Interest | Basis Risk Shortfall | |||||||||||
| Other | |||||||||||||
| Class | PPIS | SSRA | Shortfall | Prior | Int. on Prior | New | Paid | Outstanding | Prior | Int. on Prior | New | Paid | Outstanding |
| Class A-1 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class A-2 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class A-3 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class A-4 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class A-AB | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class A-S | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class B | - | - | - | 64,417.21 | 204.76 | 74,369.15 | - | 138,991.12 | - | - | - | - | - |
| Class C | - | - | - | 673,445.75 | 2,140.70 | 107,606.36 | - | 783,192.81 | - | - | - | - | - |
| Class D | - | - | - | 1,271,921.88 | 4,043.10 | 77,192.27 | - | 1,353,157.25 | - | - | - | - | - |
| Class E | - | - | - | 612,734.02 | 1,947.72 | 34,966.03 | - | 649,647.77 | - | - | - | - | - |
| Class F | - | - | - | 817,783.99 | 2,599.51 | 31,915.94 | - | 852,299.44 | - | - | - | - | - |
| Class G | - | - | - | 1,169,676.40 | 3,718.09 | - | - | 1,173,394.49 | - | - | - | - | - |
| Class H | - | - | - | 2,297,667.97 | 7,303.67 | - | - | 2,304,971.64 | - | - | - | - | - |
| Class S | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Class R | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Total | - | - | - | 6,907,647.22 | 21,957.55 | 326,049.75 | - | 7,255,654.52 | - | - | - | - | - |
| Notional | |||||||||||||
| Class X-A | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Total | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Grand Total | - | - | - | 6,907,647.22 | 21,957.55 | 326,049.75 | - | 7,255,654.52 | - | - | - | - | - |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 5 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DISTRIBUTION INFORMATION - PRINCIPAL DETAIL |
| July 11, 2025 |
| Accretion | |||||||||||||||
| & | |||||||||||||||
| Non-Cash | |||||||||||||||
| Balance | Cumulative | ||||||||||||||
| Prior | Principal | Accreted | Realized Loss | Increase/ | Current | Realized | Class % | Class % | Sub % | Sub % | |||||
| Class | Balance | Distributed | Principal | /(Recovery) | (Decrease) | Balance | Loss | Original | Current | Original | Current | ||||
| Class A-1 | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class A-2 | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class A-3 | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class A-4 | 102,265,492.27 | 22,881,223.44 | - | - | - | 79,384,268.83 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class A-AB | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class A-S | 58,763,000.00 | - | - | - | - | 58,763,000.00 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class B | 42,871,000.00 | - | - | - | - | 42,871,000.00 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class C | 33,852,000.00 | - | - | - | - | 33,852,000.00 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class D | 24,284,000.00 | - | - | - | - | 24,284,000.00 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class E | 11,000,000.00 | - | - | - | - | 11,000,000.00 | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class F | 10,040,471.16 | - | - | - | - | 10,040,471.16 | 4,823,528.84 | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class G | - | - | - | - | - | - | 12,231,000.00 | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class H | - | - | - | - | - | - | 19,132,869.00 | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class S | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Class R | - | - | - | - | - | - | - | 0.00 | % | 0.00 | % | 0.00 | % | 0.00 | % |
| Total | 283,075,963.43 | 22,881,223.44 | - | - | - | 260,194,739.99 | 36,187,397.84 | 0.00 | % | 0.00 | % | ||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 6 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| RECONCILIATION DETAIL |
| July 11, 2025 |
| SOURCE OF FUNDS | ALLOCATION OF FUNDS | ||||
| Interest Funds Available | Scheduled Fees | ||||
| Scheduled Interest | 627,728.76 | Servicing Fee | 846.76 | ||
| Prepayment Interest Shortfall | - | Trustee/Certificate Administrator Fee | 802.05 | ||
| Interest Adjustments | - | Operating Advisor Fee | 306.67 | ||
| ASER Amount | - | CREFC Intellectual Property Royalty License Fee | 117.95 | ||
| Realized Loss in Excess of Principal Balance | - | ||||
| Total Scheduled Fees | 2,073.43 | ||||
| Total Interest Funds Available | 627,728.76 | Additional Fees, Expenses, etc. | |||
| Principal Funds Available | Additional Servicing Fee | - | |||
| Scheduled Principal | 212,287.35 | Special Servicing Fee | 47,963.79 | ||
| Unscheduled Principal Collections | 22,668,936.09 | Work-out Fee | - | ||
| Repurchased Principal | - | Liquidation Fee | - | ||
| Substitution Principal | - | Trust Fund Expenses | - | ||
| Other Principal | - | Trust Advisor Expenses | - | ||
| Reimbursement of Interest on Advances to the Servicer | 3,919.29 | ||||
| Total Principal Funds Available | 22,881,223.44 | ||||
| Borrower Reimbursable Trust Fund Expenses | - | ||||
| Other Funds Available | |||||
| Reimbursement of Nonrecoverable Advances to the Servicer | - | ||||
| Yield Maintenance Charges | - | ||||
| Other Expenses | - | ||||
| Withdrawal of Withheld Amounts from the Interest Reserve | |||||
| Account | - | Total Additional Fees, Expenses, etc. | 51,883.08 | ||
| Deposit of Withheld Amounts to the Interest Reserve Account | - | ||||
| Distributions | |||||
| Current Period Adjustment to Loan - Other | - | ||||
| Interest Distribution | 573,772.25 | ||||
| Total Other Funds Available | - | Principal Distribution | 22,881,223.44 | ||
| Yield Maintenance Charge Distribution | - | ||||
| Total Distributions | 23,454,995.69 | ||||
| Total Funds Available | 23,508,952.20 | ||||
| Total Funds Allocated | 23,508,952.20 | ||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 7 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| OTHER INFORMATION |
| Interest Reserve Account Information |
| July 11, 2025 |
| Beginning Interest Reserve Account Balance | 0.00 | |
| Deposit of Withheld Amounts to the Interest Reserve Account | 0.00 | |
| Withdrawal of Withheld Amounts from the Interest Reserve Account | 0.00 | |
| Ending Interest Reserve Account Balance | 0.00 | |
| Excess Liquidation Proceeds Reserve Account Information | ||
| Beginning Excess Liquidation Proceeds Reserve Account Balance | 0.00 | |
| Deposit to the Excess Liquidation Proceeds Reserve Account | 0.00 | |
| Withdrawal from the Excess Liquidation Proceeds Reserve Account | 0.00 | |
| Ending Excess Liquidation Proceeds Reserve Account Balance | 0.00 | |
| Collateral Information | ||
| % of Cut-Off Principal Balance Outstanding | 35.972094 | % |
| Controlling Class Information | ||
| Controlling Class is Class F. | ||
| Control Termination Event is in Effect. | ||
| Identification of the current Controlling Class Representative has not been provided. | ||
| There Are No Disclosable Special Servicer Fees. | ||
| Non-Active Exchangeable Certificates | ||
| Class PEZ Beginning Balance | 135,486,000.00 | |
| Class PEZ Ending Balance | 135,486,000.00 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 8 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STRATIFICATION DETAIL |
| July 11, 2025 |
| Anticipated Remaining Term | ||||||
| Anticipated Remaining | Asset | Ending Scheduled | % of | Wtd Avg | ||
| Term Range | Count | Balance | Agg.Bal. WAC | WAM | DSCR | |
| 60 Months or Less | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| 61 to 90 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 91 Months or Greater | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Debt Service Coverage Ratio | ||||||
| Debt Service Coverage | Asset | Ending Scheduled | % of | Wtd Avg | ||
| Ratio Range | Count | Balance | Agg.Bal. WAC | WAM | DSCR | |
| 1.250 or Less | 19 | 151,426,119.03 | 58.20 | 3.6156 | 38 | -1.414990 |
| 1.251 to 1.500 | 2 | 28,406,083.12 | 10.92 | 4.2055 | 0 | 1.432738 |
| 1.501 to 1.750 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 1.751 to 2.000 | 2 | 77,155,000.00 | 29.65 | 3.9240 | 0 | 1.864843 |
| 2.001 to 2.250 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 2.251 to 2.500 | 1 | 3,207,537.84 | 1.23 | 4.4600 | 0 | 2.301700 |
| 2.501 to 2.750 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 2.751 to 3.000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 3.001 to 3.250 | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 3.251 to 3.500 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 3.501 to 3.750 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 3.751 to 4.000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 4.001 or Greater | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 9 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STRATIFICATION DETAIL |
| July 11, 2025 |
| Ending Schedule Balance | ||||||
| Ending Schedule Balance | Asset | Ending Scheduled | % of | Wtd Avg | ||
| Range | Count | Balance | Agg.Bal. WAC WAM | DSCR | ||
| 1 to 5,000,000 | 1 | 3,207,537.84 | 1.23 | 4.4600 | 0 | 2.301700 |
| 10,000,001 to 15,000,000 | 1 | 12,469,253.51 | 4.79 | 4.5800 | 0 | 1.114600 |
| 15,000,001 to 20,000,000 | 1 | 19,136,050.98 | 7.35 | 4.1065 | 0 | 1.425200 |
| 20,000,001 to 25,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 25,000,001 to 30,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 30,000,001 to 35,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 35,000,001 to 40,000,000 | 1 | 38,956,865.52 | 14.97 | 4.1300 | 0 | 1.189400 |
| 40,000,001 to 45,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 45,000,001 to 50,000,000 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 5,000,001 to 10,000,000 | 2 | 14,425,032.14 | 5.54 | 4.3135 | 0 | 1.588887 |
| 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 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 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 | 72,000,000.00 | 27.67 | 3.9085 | 0 | 1.866500 |
| 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 |
| 85,000,000+ | 1 | 100,000,000.00 | 38.43 | 3.2950 | 58 | -2.745000 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 10 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STRATIFICATION DETAIL |
| July 11, 2025 |
| Loan Rate | ||||||
| Asset | Ending Scheduled | % of | Wtd Avg | |||
| Loan Rate Range | Count | Balance | Agg.Bal. WAC WAM | DSCR | ||
| 4.00 or Less | 17 | 172,000,000.00 | 66.10 | 3.5518 | 33 | -0.814605 |
| 4.01 to 4.25 | 3 | 63,247,916.50 | 24.31 | 4.1237 | 0 | 1.313908 |
| 4.26 to 4.50 | 3 | 12,477,569.98 | 4.80 | 4.4229 | 0 | 1.667679 |
| 4.51 to 4.75 | 2 | 12,469,253.51 | 4.79 | 4.5800 | 0 | 1.114600 |
| 4.76 to 5.00 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 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 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Property Type | ||||||
| Asset | Ending Scheduled | % of | Wtd Avg | |||
| Property Type Range | Count | Balance | Agg.Bal. WAC WAM | DSCR | ||
| Industrial | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Lodging | 2 | 9,270,032.14 | 3.56 | 4.4100 | 0 | 1.448300 |
| Mixed Use | 3 | 19,136,050.98 | 7.35 | 4.1065 | 0 | 1.425200 |
| Multifamily | 2 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Office | 4 | 142,164,403.36 | 54.64 | 3.5501 | 40 | -1.553004 |
| Other | 4 | 72,000,000.00 | 27.67 | 3.9085 | 0 | 1.866500 |
| Retail | 8 | 17,624,253.51 | 6.77 | 4.4513 | 0 | 1.327273 |
| Self Storage | 2 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 11 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STRATIFICATION DETAIL |
| July 11, 2025 |
| Remaining Amortization Term | ||||||
| Remaining Amortization | Asset | Ending Scheduled | % of | Wtd Avg | ||
| Term Range | Count | Balance | Agg.Bal. | WAC | WAM | DSCR |
| 240 Months or Less | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| 241 to 270 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 271 to 300 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 301 Months or Greater | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Seasoning | ||||||
| Asset | Ending Scheduled | % of | Wtd Avg | |||
| Seasoning Range | Count | Balance | Agg.Bal. | 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 | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 37 to 48 Months | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| 49 Months or Greater | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 12 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| STRATIFICATION DETAIL |
| July 11, 2025 |
| State | ||||||
| Asset | Ending Scheduled | % of | Wtd Avg | |||
| State Range | Count | Balance | Agg.Bal. WAC WAM | DSCR | ||
| California | 3 | 38,956,865.52 | 14.97 | 4.1300 | 0 | 1.189400 |
| Colorado | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Florida | 4 | 12,469,253.51 | 4.79 | 4.5800 | 0 | 1.114600 |
| Hawaii | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Illinois | 1 | 100,000,000.00 | 38.43 | 3.2950 | 58 | -2.745000 |
| Iowa | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Kansas | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Louisiana | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Maryland | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Michigan | 2 | 3,207,537.84 | 1.23 | 4.4600 | 0 | 2.301700 |
| Minnesota | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Nebraska | 1 | 9,270,032.14 | 3.56 | 4.4100 | 0 | 1.448300 |
| Nevada | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| New Jersey | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| North Carolina | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Ohio | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Oklahoma | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Oregon | 0 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Pennsylvania | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Rhode Island | 1 | 5,155,000.00 | 1.98 | 4.1400 | 0 | 1.841700 |
| South Carolina | 1 | 0.00 | 0.00 | 0.0000 | 0 | 0.000000 |
| Texas | 3 | 19,136,050.98 | 7.35 | 4.1065 | 0 | 1.425200 |
| Various | 4 | 72,000,000.00 | 27.67 | 3.9085 | 0 | 1.866500 |
| Total | 25 | 260,194,739.99 | 100.00 | 3.7819 | 22 | -0.085717 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 13 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| MORTGAGE LOAN DETAIL |
| July 11, 2025 |
| Prop | Paid | Beginning | Ending | Payment Workout Mod | ||||||||||||||
| Type | Through | Gross | Interest | Principal | Scheduled | Scheduled | Maturity | Status Strategy Code | ||||||||||
| Loan ID | OMCR | (1) | City | State | Date | Coupon | Payment | Payment | Balance | Balance | Date | (2 | ) | (3 | ) | (4 | ) | |
| 304101385 | 1 | OF | Chicago | IL | 10/06/2021 | 3.29500 | % | - | - | 100,000,000.00 | 100,000,000.00 | 05/06/2030 | 3 | 1 | 0 | |||
| 300571323 | 13 | RT | Port Charlotte | FL | 06/06/2025 | 4.58000 | % | 47,693.95 | 26,977.72 | 12,496,231.23 | 12,469,253.51 | 06/06/2025 | 5 | 0 | 0 | |||
| 304101397 | 17 | LO | Omaha | NE | 06/06/2025 | 4.41000 | % | 34,148.23 | 22,003.17 | 9,292,035.31 | 9,270,032.14 | 06/06/2025 | 5 | 8 | 8 | |||
| 304140002 | 2 | N/A | Various | Various | 06/06/2025 | 3.90850 | % | 234,510.00 | - | 72,000,000.00 | 72,000,000.00 | 04/06/2025 | 5 | 1 | 8 | |||
| 304140034 | 34 | RT | North Smithfield | RI | 07/01/2025 | 4.14000 | % | 17,784.75 | - | 5,155,000.00 | 5,155,000.00 | 06/01/2025 | 4 | 13 | 0 | |||
| 304101400 | 4 | OF | Pasadena | CA | 05/06/2025 | 4.13000 | % | 134,315.26 | 69,359.65 | 39,026,225.17 | 38,956,865.52 | 06/06/2025 | 5 | 13 | 0 | |||
| 304101387 | 43 | OF | Ann Arbor | MI | 07/06/2025 | 4.46000 | % | 11,945.83 | 6,587.61 | 3,214,125.45 | 3,207,537.84 | 06/06/2025 | 4 | 0 | 0 | |||
| 304101388 | 49 | RT | Dover | OH | 07/06/2025 | 4.70000 | % | 7,890.17 | 2,014,511.31 | 2,014,511.31 | - | 05/06/2025 | 5 | 8 | 0 | |||
| 304140008 | 8 | MU | Orinda | CA | 07/06/2025 | 4.27900 | % | 73,804.37 | 20,697,648.54 | 20,697,648.54 | - | 06/06/2025 | 5 | 0 | 0 | |||
| 304140009 | 9 | MU | Sugar Land | TX | 06/06/2025 | 4.10650 | % | 65,636.20 | 44,135.44 | 19,180,186.42 | 19,136,050.98 | 06/06/2025 | 5 | 0 | 0 | |||
| Total | Count = 10 | 627,728.76 | 22,881,223.44 | 283,075,963.43 | 260,194,739.99 | |||||||||||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 14 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| NOI DETAIL |
| July 11, 2025 |
| Property | Ending | Preceding | Most | Most Recent | Most Recent | ||||||
| Type | Scheduled | Fiscal | Recent | Financial As of | Financial Asof | ||||||
| Loan ID | OMCR | (1) | City | State | Balance | Year NOI | NOI | Start Date | End Date | ||
| 304101385 | 1 | OF | Chicago | IL | 100,000,000.00 | (6,284,037.54 | ) | (1,938,134.55 | ) | 01/01/2025 | 03/31/2025 |
| 300571323 | 13 | RT | Port Charlotte | FL | 12,469,253.51 | 1,445,498.01 | 878,629.53 | Not Available | Not Available | ||
| 304101397 | 17 | LO | Omaha | NE | 9,270,032.14 | 1,222,754.56 | 1,242,509.64 | 04/01/2024 | 03/31/2025 | ||
| 304140002 | 2 | N/A | Various | Various | 72,000,000.00 | 27,939,961.01 | 14,683,458.00 | Not Available | Not Available | ||
| 304140034 | 34 | RT | North Smithfield | RI | 5,155,000.00 | 401,800.00 | 200,900.00 | 01/01/2020 | 06/30/2020 | ||
| 304101400 | 4 | OF | Pasadena | CA | 38,956,865.52 | 2,900,108.60 | 2,334,548.00 | Not Available | Not Available | ||
| 304101387 | 43 | OF | Ann Arbor | MI | 3,207,537.84 | 515,443.50 | 140,103.67 | 01/01/2025 | 03/31/2025 | ||
| 304140009 | 9 | MU | Sugar Land | TX | 19,136,050.98 | 1,994,326.62 | 500,060.02 | 01/01/2025 | 03/31/2025 | ||
| Total | Count = 8 | 260,194,739.99 | 30,135,854.76 | 18,042,074.31 | |||||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 15 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| DELINQUENCY LOAN DETAIL |
| July 11, 2025 |
| Actual | Paid | Current P&I | Total P&I | Cumulative | Other Expense Payment Workout Most Recent | ||||||||||
| Principal | Through | Advances | Advances | Accrued Unpaid | Advances | Status Strategy Special Serv | Foreclosure | Bankruptcy | REO | ||||||
| Loan ID | OMCR | Balance | Date | (Net of ASER) Outstanding | Interest Advances | Outstanding | (2 | ) | (3 | ) | Transfer Date | Date | Date | Date | |
| 304101385 | 1 | 100,000,000.00 | 10/06/2021 | - | - | 4,149,773.11 | 2,159.50 | 3 | 1 | 11/17/2021 | |||||
| 300571323 | 13 | 12,496,231.23 | 06/06/2025 | 74,671.67 | 74,619.60 | - | - | 5 | 0 | ||||||
| 304101397 | 17 | 9,292,035.30 | 06/06/2025 | 56,151.40 | 56,112.68 | - | - | 5 | 8 | 04/06/2020 | |||||
| 304140002 | 2 | 72,000,000.00 | 06/06/2025 | 234,510.00 | 234,210.00 | 1,454.73 | - | 5 | 1 | 11/24/2024 | |||||
| 304101400 | 4 | 39,090,877.72 | 05/06/2025 | 203,674.91 | 407,018.90 | 1,191.38 | 6,660.00 | 5 | 13 | 03/20/2025 | |||||
| 304140009 | 9 | 19,180,186.42 | 06/06/2025 | 109,771.64 | 109,691.72 | - | - | 5 | 0 | ||||||
| Total | Count = 6 | 252,059,330.67 | 678,779.62 | 881,652.90 | 4,152,419.22 | 8,819.50 | |||||||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 16 of 37 | © Copyright 2025 Citigroup | ||||||||||||
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| COLLATERAL PERFORMANCE - DELINQUENCY AND LOAN STATUS DETAIL |
| July 11, 2025 |
| – | |||||||||||||||||||||||||||||
| Delinquent | |||||||||||||||||||||||||||||
| (Does not include loans in Bankruptcy, Foreclosure, or REO) | |||||||||||||||||||||||||||||
| 30 | Day | 60 | Day | 90 | Day | 120 | + Day | Bankruptcy | Foreclosure | REO | |||||||||||||||||||
| Distribution | |||||||||||||||||||||||||||||
| Date | Count | Balance | Count | Balance | Count | Balance | Count | Balance | Count | Balance | Count | Balance | Count | Balance | |||||||||||||||
| 1 | 39,090,878 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 07/11/2025 | |||||||||||||||||||||||||||||
| 12.5 | % | 15.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 12.5 | % | 38.4 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 1 | 2,024,136 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 06/12/2025 | |||||||||||||||||||||||||||||
| 10.0 | % | 0.7 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 10.0 | % | 35.3 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 1 | 12,573,382 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 05/12/2025 | |||||||||||||||||||||||||||||
| 4.0 | % | 3.3 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 4.0 | % | 26.3 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 04/11/2025 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 3.0 | % | 21.4 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 03/12/2025 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.9 | % | 20.8 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 02/12/2025 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.4 | % | 18.6 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 01/13/2025 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.2 | % | 16.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 12/12/2024 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.2 | % | 16.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 11/13/2024 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.2 | % | 15.9 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 10/11/2024 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.1 | % | 15.8 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 09/12/2024 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.1 | % | 15.8 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 100,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||
| 08/12/2024 | |||||||||||||||||||||||||||||
| 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 2.1 | % | 15.7 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | % | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 17 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| APPRAISAL REDUCTION DETAIL |
| July 11, 2025 |
| Beginning | Ending | Appraisal | Appraisal | Most Recent | Cumulative | |||
| Loan ID | OMCR | Property Name | Scheduled Balance | Scheduled Balance | Reduction Amount | Reduction Date | ASER Amount | ASER Amount |
| 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 94,129,878.79 | 04/07/2025 | - | 1,102,148.51 |
| 304101400 | 4 | Pasadena Office Tower | 39,026,225.17 | 38,956,865.52 | 18,433,794.92 | 06/06/2025 | - | - |
| Total | Count = 2 | 139,026,225.17 | 138,956,865.52 | 112,563,673.71 | - | 1,102,148.51 | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 18 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL APPRAISAL REDUCTION DETAIL |
| July 11, 2025 | |
| Most Recent | Cumulative |
| Distribution | Beginning | Ending | Appraisal | Appraisal | |||||
| Date | Loan ID | OMCR | Property Name | Scheduled Balance Scheduled Balance Reduction Amount Reduction Date | ASER Amount | ASER Amount | |||
| 7/11/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 94,129,878.79 | 04/07/2025 | - | 1,102,148.51 |
| 7/11/2025 | 304101400 | 4 | Pasadena Office Tower | 39,026,225.17 | 38,956,865.52 | 18,433,794.92 | 06/06/2025 | - | - |
| 6/12/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 94,129,878.79 | 04/07/2025 | - | 1,102,148.51 |
| 6/12/2025 | 304101400 | 4 | Pasadena Office Tower | 39,090,877.72 | 39,026,225.17 | 18,433,794.81 | 06/06/2025 | - | - |
| 5/12/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 94,129,878.79 | 04/07/2025 | - | 1,102,148.51 |
| 4/11/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 94,129,878.79 | 04/07/2025 | - | 1,102,148.51 |
| 3/12/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 89,858,523.94 | 03/06/2025 | - | 1,102,148.51 |
| 2/12/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 1/13/2025 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 12/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 11/13/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 10/11/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 9/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 8/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 7/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 6/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 5/10/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 4/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | - | 1,102,148.51 |
| 3/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 60,012,176.11 | 03/05/2024 | 159,048.94 | 1,102,148.51 |
| 2/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 943,099.57 |
| 1/12/2024 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 863,000.70 |
| 12/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 77,515.03 | 782,901.83 |
| 11/10/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 705,386.80 |
| 10/13/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 77,515.03 | 625,287.93 |
| 9/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 547,772.90 |
| 8/11/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 467,674.03 |
| 7/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 77,515.03 | 387,575.16 |
| 6/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 310,060.13 |
| 5/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 77,515.03 | 229,961.26 |
| 4/13/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.53 | 03/01/2023 | 80,098.87 | 152,446.23 |
| 3/10/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | 28,272,960.38 | 03/01/2023 | 72,347.36 | 72,347.36 |
| 2/10/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 1/12/2023 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 19 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL APPRAISAL REDUCTION DETAIL |
| July 11, 2025 |
| Distribution | Beginning | Ending | Appraisal | Appraisal | Most Recent | Cumulative | |||
| Date | Loan ID | OMCR | Property Name | Scheduled Balance Scheduled Balance Reduction Amount Reduction Date | ASER Amount | ASER Amount | |||
| 12/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 11/14/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 10/13/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 9/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 8/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 7/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 6/10/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 5/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 4/12/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 3/11/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 2/11/2022 | 304101385 | 1 | 135 South LaSalle | 100,000,000.00 | 100,000,000.00 | - | 02/06/2022 | - | - |
| 9/14/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 10,410,719.56 | 10,445,039.27 | - | 08/06/2020 | - | - |
| 8/12/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 10,427,273.39 | 10,410,719.56 | - | 08/06/2020 | - | - |
| 9/12/2018 | 304140028 | 28 | Infinity Corporate Center | 5,924,901.16 | - | - | - | 41,157.18 | |
| 8/10/2018 | 304140028 | 28 | Infinity Corporate Center | 5,933,247.11 | 5,924,901.16 | 2,799,940.38 | 08/06/2018 | 10,457.97 | 41,157.18 |
| 7/12/2018 | 304140028 | 28 | Infinity Corporate Center | 5,942,281.96 | 5,933,247.11 | 2,799,940.38 | 07/06/2018 | 10,120.62 | 30,699.21 |
| 6/12/2018 | 304140028 | 28 | Infinity Corporate Center | 5,950,562.60 | 5,942,281.96 | 2,799,940.38 | 06/06/2018 | 10,457.97 | 20,578.59 |
| 5/11/2018 | 304140028 | 28 | Infinity Corporate Center | 5,959,534.48 | 5,950,562.60 | 2,799,940.38 | 05/07/2018 | 10,120.62 | 10,120.62 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 20 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| LOAN MODIFICATION DETAIL |
| July 11, 2025 |
| Modification | Modification | ||||
| Loan ID | OMCR | Property Name | Date | Code (4) | |
| 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 | |
| 304140002 | 2 | Selig Office Portfolio | 07/01/2015 | 8 | |
| Total | Count = 2 | ||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 21 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL LOAN MODIFICATION DETAIL |
| July 11, 2025 |
| Distribution | Modification | Modification | |||
| Date | Loan ID | OMCR | Property Name | Date | Code (4) |
| 07/11/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 07/11/2025 | 304140002 | 2 | Selig Office Portfolio | 07/01/2015 | 8 |
| 06/12/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 06/12/2025 | 304140002 | 2 | Selig Office Portfolio | 07/01/2015 | 8 |
| 05/12/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 04/11/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 03/12/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 02/12/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 01/13/2025 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 12/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 11/13/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 10/11/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 09/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 08/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 07/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 06/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 05/10/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 04/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 03/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 02/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 01/12/2024 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 12/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 11/10/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 10/13/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 09/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 08/11/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 07/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 06/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 05/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 04/13/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 03/10/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 02/10/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 01/12/2023 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 22 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL LOAN MODIFICATION DETAIL |
| July 11, 2025 |
| Distribution | Modification | Modification | |||
| Date | Loan ID | OMCR | Property Name | Date | Code (4) |
| 12/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 11/14/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 10/13/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 09/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 08/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 07/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 06/10/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 05/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 04/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 03/11/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 02/11/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 01/12/2022 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 12/10/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 11/15/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 11/15/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 10/13/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 10/13/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 09/13/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 09/13/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 08/12/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 08/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 07/12/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 07/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 06/11/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 06/11/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 05/12/2021 | 304140016 | 16 | Crowne Plaza Bloomington | 05/06/2020 | 8 |
| 05/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 04/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 03/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 02/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 01/12/2021 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 12/11/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 11/13/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 23 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL LOAN MODIFICATION DETAIL |
| July 11, 2025 |
| Distribution | Modification | Modification | |||
| Date | Loan ID | OMCR | Property Name | Date | Code (4) |
| 10/13/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 09/14/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| 08/12/2020 | 304101397 | 17 | Magnolia Hotel Omaha | 07/01/2020 | 8 |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 24 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| SPECIALLY SERVICED LOAN DETAIL |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | |||
| Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | ||
| Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date |
| 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 304101400 | 4 | 13 | 8,130.46 | 38,956,865.52 | 39,090,877.72 | 23,200,000.00 | 04/30/2025 | 03/20/2025 | |
| 304140002 | 2 | 1 | 15,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | |
| 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| Total | Count = 4 | 47,963.79 | 216,111,865.52 | 216,245,877.72 | 620,100,000.00 | ||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 25 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL SPECIALLY SERVICED LOANS |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | ||||
| Distribution | Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | ||
| Date | Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date |
| 07/11/2025 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 06/12/2025 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 05/12/2025 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 04/11/2025 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 03/12/2025 | 304101385 | 1 | 1 | 19,444.44 | 100,000,000.00 | 100,000,000.00 | 44,500,000.00 | 11/29/2024 | 11/17/2021 | |
| 02/12/2025 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 01/13/2025 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 12/12/2024 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 11/13/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 10/11/2024 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 09/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 08/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 07/12/2024 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 06/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 05/10/2024 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 04/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 03/12/2024 | 304101385 | 1 | 1 | 20,138.89 | 100,000,000.00 | 100,000,000.00 | 67,700,000.00 | 01/08/2024 | 11/17/2021 | |
| 02/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 01/12/2024 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 12/12/2023 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 11/10/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 10/13/2023 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 09/12/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 08/11/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 07/12/2023 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 06/12/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 05/12/2023 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 04/13/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 03/10/2023 | 304101385 | 1 | 1 | 19,444.44 | 100,000,000.00 | 100,000,000.00 | 90,000,000.00 | 01/01/2023 | 11/17/2021 | |
| 02/10/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | |
| 01/12/2023 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | |
| 12/12/2022 | 304101385 | 1 | 1 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 26 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL SPECIALLY SERVICED LOANS |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | |||||
| Distribution | Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | |||
| Date | Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date | |
| 11/14/2022 | 304101385 | 1 | 1 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 10/13/2022 | 304101385 | 1 | 10 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 09/12/2022 | 304101385 | 1 | 10 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 08/12/2022 | 304101385 | 1 | 10 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 07/12/2022 | 304101385 | 1 | 10 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 06/10/2022 | 304101385 | 1 | 10 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 05/12/2022 | 304101385 | 1 | 10 | 20,833.33 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 04/12/2022 | 304101385 | 1 | 10 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 03/11/2022 | 304101385 | 1 | 10 | 19,444.44 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 02/11/2022 | 304101385 | 1 | 13 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 130,000,000.00 | 01/01/2022 | 11/17/2021 | ||
| 01/12/2022 | 304101385 | 1 | 13 | 21,527.78 | 100,000,000.00 | 100,000,000.00 | 330,000,000.00 | 03/30/2015 | 11/17/2021 | ||
| 12/10/2021 | 304101385 | 1 | 13 | 8,333.33 | 100,000,000.00 | 100,000,000.00 | 330,000,000.00 | 03/30/2015 | 11/17/2021 | ||
| 05/11/2018 | 304101388 | 49 | 8 | (22,983.33 | ) | 2,364,016.73 | 2,364,016.73 | 3,825,000.00 | 04/01/2015 | 04/25/2018 | |
| 04/12/2018 | 304101388 | 49 | 9 | 3,500.00 | 2,367,605.83 | 2,367,605.83 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 03/12/2018 | 304101388 | 49 | 13 | 3,500.00 | 2,370,872.60 | 2,378,289.43 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 02/12/2018 | 304101388 | 49 | 13 | 3,500.00 | 2,375,052.68 | 2,378,289.43 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 01/12/2018 | 304101388 | 49 | 13 | 3,500.00 | 2,378,289.43 | 2,378,289.43 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 12/12/2017 | 304101388 | 49 | 13 | 3,500.00 | 2,381,513.14 | 2,385,033.98 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 11/10/2017 | 304101388 | 49 | 13 | 3,500.00 | 2,385,033.98 | 2,391,725.13 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 10/13/2017 | 304101388 | 49 | 13 | 1,983.33 | 2,388,230.50 | 2,391,725.13 | 3,825,000.00 | 04/01/2015 | 09/19/2017 | ||
| 10/13/2020 | 304101397 | 17 | 8 | - | 10,445,039.27 | 10,445,039.27 | 13,000,000.00 | 04/20/2020 | 04/06/2020 | 09/02/2020 | |
| 09/14/2020 | 304101397 | 17 | 1 | 3,500.00 | 10,445,039.27 | 10,445,039.27 | 13,000,000.00 | 04/20/2020 | 04/06/2020 | ||
| 08/12/2020 | 304101397 | 17 | 1 | 3,500.00 | 10,410,719.56 | 10,445,039.27 | 13,000,000.00 | 04/20/2020 | 04/06/2020 | ||
| 07/10/2020 | 304101397 | 17 | 98 | 3,500.00 | 10,427,273.39 | 10,445,039.27 | 16,600,000.00 | 04/01/2015 | 04/06/2020 | ||
| 06/12/2020 | 304101397 | 17 | 98 | 3,500.00 | 10,445,039.27 | 10,445,039.27 | 16,600,000.00 | 04/01/2015 | 04/06/2020 | ||
| 05/12/2020 | 304101397 | 17 | 13 | 3,500.00 | 10,461,463.26 | 10,461,463.26 | 16,600,000.00 | 04/01/2015 | 04/06/2020 | ||
| 04/10/2020 | 304101397 | 17 | 13 | - | 10,479,103.95 | 10,495,399.07 | 16,600,000.00 | 04/01/2015 | 04/06/2020 | ||
| 07/11/2025 | 304101400 | 4 | 13 | 8,130.46 | 38,956,865.52 | 39,090,877.72 | 23,200,000.00 | 04/30/2025 | 03/20/2025 | ||
| 06/12/2025 | 304101400 | 4 | 13 | 8,415.40 | 39,026,225.17 | 39,090,877.72 | 23,200,000.00 | 04/30/2025 | 03/20/2025 | ||
| 05/12/2025 | 304101400 | 4 | 13 | 8,158.29 | 39,090,877.72 | 39,159,777.73 | 56,850,000.00 | 04/16/2015 | 03/20/2025 | ||
| 04/11/2025 | 304101400 | 4 | 13 | 4,630.61 | 39,159,777.73 | 39,223,957.00 | 56,850,000.00 | 04/16/2015 | 03/20/2025 | ||
| 07/11/2025 | 304140002 | 2 | 1 | 15,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 27 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL SPECIALLY SERVICED LOANS |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | |||||
| Distribution | Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | |||
| Date | Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date | |
| 06/12/2025 | 304140002 | 2 | 1 | 15,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | ||
| 03/12/2025 | 304140002 | 2 | 1 | 14,000.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | ||
| 02/12/2025 | 304140002 | 2 | 1 | 15,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | ||
| 01/13/2025 | 304140002 | 2 | 1 | 15,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | 11/24/2024 | ||
| 12/12/2024 | 304140002 | 2 | 98 | 5,500.00 | 72,000,000.00 | 72,000,000.00 | 544,500,000.00 | 03/02/2015 | |||
| 11/15/2021 | 304140016 | 16 | 6 | (25,040.30 | ) | - | - | 31,900,000.00 | 12/01/2014 | 02/04/2021 | |
| 10/13/2021 | 304140016 | 16 | 6 | 2,262.80 | 10,840,353.25 | 10,840,353.25 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 09/13/2021 | 304140016 | 16 | 6 | 2,342.44 | 10,861,430.72 | 10,881,026.79 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 08/12/2021 | 304140016 | 16 | 6 | 2,346.65 | 10,881,026.79 | 10,921,389.82 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 07/12/2021 | 304140016 | 16 | 2 | 2,275.29 | 10,900,544.70 | 10,921,389.82 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 06/11/2021 | 304140016 | 16 | 2 | 2,355.30 | 10,921,389.82 | 10,940,746.76 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 05/12/2021 | 304140016 | 16 | 2 | 2,283.63 | 10,940,746.76 | 11,004,001.62 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 04/12/2021 | 304140016 | 16 | 2 | 2,363.89 | 10,961,436.70 | 11,004,001.62 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 03/12/2021 | 304140016 | 16 | 6 | 2,139.67 | 10,980,633.92 | 11,004,001.62 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 02/12/2021 | 304140016 | 16 | 6 | 2,373.01 | 11,004,001.62 | 11,041,980.66 | 31,900,000.00 | 12/01/2014 | 02/04/2021 | ||
| 01/12/2021 | 304140016 | 16 | 6 | 2,377.09 | 11,023,029.08 | 11,041,980.66 | 31,900,000.00 | 12/01/2014 | 11/06/2020 | ||
| 12/11/2020 | 304140016 | 16 | 98 | 1,920.53 | 11,041,980.66 | 11,062,279.84 | 31,900,000.00 | 12/01/2014 | 11/06/2020 | ||
| 09/12/2018 | 304140028 | 28 | 8 | - | - | - | 3,875,000.00 | 10/12/2017 | 09/19/2017 | ||
| 08/10/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,924,901.16 | 5,986,255.08 | 3,875,000.00 | 10/12/2017 | 09/19/2017 | ||
| 07/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,933,247.11 | 5,986,255.08 | 3,875,000.00 | 10/12/2017 | 09/19/2017 | ||
| 06/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,942,281.96 | 5,986,255.08 | 3,875,000.00 | 10/12/2017 | 09/19/2017 | ||
| 05/11/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,950,562.60 | 5,986,255.08 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 04/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,959,534.48 | 5,986,255.08 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 03/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,967,750.30 | 5,986,255.08 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 02/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,978,109.06 | 5,994,370.49 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 01/12/2018 | 304140028 | 28 | 2 | 3,500.00 | 5,986,255.08 | 5,994,370.49 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 12/12/2017 | 304140028 | 28 | 2 | 3,500.00 | 5,994,370.49 | 6,003,183.05 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 11/10/2017 | 304140028 | 28 | 2 | 3,500.00 | 6,003,183.05 | 6,011,234.86 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 10/13/2017 | 304140028 | 28 | 13 | 1,983.33 | 6,011,234.86 | 6,019,986.09 | 8,500,000.00 | 03/12/2015 | 09/19/2017 | ||
| 07/11/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | ||
| 06/12/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | ||
| 05/12/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 28 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL SPECIALLY SERVICED LOANS |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | ||||
| Distribution | Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | ||
| Date | Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date |
| 04/11/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 03/12/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 02/12/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 01/13/2025 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 12/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 11/13/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 10/11/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 09/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 08/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 07/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 06/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 05/10/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 04/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 03/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 02/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 01/12/2024 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 12/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 11/10/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 10/13/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 09/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 08/11/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 07/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 06/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 05/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 04/13/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 03/10/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 02/10/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 01/12/2023 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 12/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 11/14/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 10/13/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 09/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 29 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL SPECIALLY SERVICED LOANS |
| July 11, 2025 |
| Special Servicing | Ending | Ending | Most | Most Recent | Most Recent | Most Recent | ||||
| Distribution | Workout | Fee Amount | Scheduled | Actual | Recent | Valuation | Special Servicer | Master Servicer | ||
| Date | Loan ID | OMCR | Strategy (3) | Plus Adjustments | Balance | Balance | Value | Date | Transfer Date | Return Date |
| 08/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 07/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 06/10/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 05/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 04/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 03/11/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 02/11/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 01/12/2022 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 12/10/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 11/15/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 10/13/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 09/13/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 08/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 07/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 06/11/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 05/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 04/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 03/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 02/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 01/12/2021 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 12/11/2020 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 11/13/2020 | 304140034 | 34 | 13 | 3,500.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| 10/13/2020 | 304140034 | 34 | 13 | 1,750.00 | 5,155,000.00 | 5,155,000.00 | 7,900,000.00 | 03/08/2015 | 09/16/2020 | |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 30 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| UNSCHEDULED PRINCIPAL DETAIL |
| July 11, 2025 |
| Liquidation / | Liquid / Prepay | Principal | Principal | Prepayment Interest | Prepayment | Yield Maintenance | ||
| Loan ID | OMCR | Prepayment Date | Code (5) | Collections | Adjustments | Excess / (Shortfall) | Penalties (PPP) | Penalties (YM) |
| 304101388 | 49 | 07/07/2025 | 5 | 2,009,539.26 | - | - | - | - |
| 304140008 | 8 | 07/07/2025 | 5 | 20,659,396.83 | - | - | - | - |
| Total | Count = 2 | 22,668,936.09 | - | - | - | - | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 31 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 |
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 |
| HISTORICAL UNSCHEDULED PRINCIPAL DETAIL |
| July 11, 2025 | |
| Prepayment | Yield Maintenance |
| (PPP) | Penalties (YM) |
| Distribution | Liquidation / | Liquid / Prepay | Principal | Principal | Prepayment Interest | ||||
| Date | Loan ID | OMCR | Prepayment Date | Code (5) | Collections | Adjustments | Excess / (Shortfall) | Penalties | |
| 7/11/2025 | 304101388 | 49 | 07/07/2025 | 5 | 2,009,539.26 | - | - | - | - |
| 7/11/2025 | 304140008 | 8 | 07/07/2025 | 5 | 20,659,396.83 | - | - | - | - |
| 6/12/2025 | 304140010 | 10 | 05/29/2025 | 5 | 22,200,000.00 | - | - | - | - |
| 6/12/2025 | 304101390 | 12 | 06/06/2025 | 5 | 12,863,291.87 | - | - | - | - |
| 6/12/2025 | 304101399 | 20 | 06/06/2025 | 5 | 9,000,000.00 | - | - | - | - |
| 6/12/2025 | 304101389 | 22 | 06/06/2025 | 5 | 7,137,168.30 | - | - | - | - |
| 6/12/2025 | 304101398 | 23 | 06/06/2025 | 5 | 6,874,567.56 | - | - | - | - |
| 6/12/2025 | 304140024 | 24 | 05/30/2025 | 5 | 5,781,616.27 | - | - | - | - |
| 6/12/2025 | 304101391 | 25 | 05/30/2025 | 5 | 5,765,644.28 | - | - | - | - |
| 6/12/2025 | 300571332 | 31 | 06/05/2025 | 5 | 4,982,241.31 | - | - | - | - |
| 6/12/2025 | 304140035 | 35 | 06/06/2025 | 5 | 4,534,333.38 | - | - | - | - |
| 6/12/2025 | 301461015 | 36 | 06/06/2025 | 5 | 4,027,665.86 | - | - | - | - |
| 6/12/2025 | 304101396 | 40 | 06/06/2025 | 5 | 2,644,111.66 | - | - | - | - |
| 6/12/2025 | 304140041 | 41 | 05/30/2025 | 5 | 3,170,841.93 | - | - | - | - |
| 6/12/2025 | 304140045 | 45 | 05/30/2025 | 5 | 2,516,472.33 | - | - | - | - |
| 6/12/2025 | 304101407 | 46 | 06/06/2025 | 5 | 2,477,677.43 | - | - | - | - |
| 6/12/2025 | 300571326 | 47 | 06/05/2025 | 5 | 2,660,040.30 | - | - | - | - |
| 5/12/2025 | 304140014 | 14 | 05/06/2025 | 5 | 11,280,703.66 | - | - | - | - |
| 5/12/2025 | 304101380 | 15 | 05/06/2025 | 5 | 9,913,266.50 | - | - | - | - |
| 5/12/2025 | 304140027 | 27 | 05/06/2025 | 5 | 5,351,921.86 | - | - | - | - |
| 5/12/2025 | 304140038 | 38 | 05/06/2025 | 5 | 3,992,703.35 | - | - | - | - |
| 5/12/2025 | 304140039 | 39 | 04/18/2025 | 5 | 3,650,567.09 | - | - | - | - |
| 5/12/2025 | 304101386 | 42 | 05/05/2025 | 5 | 3,035,428.69 | - | - | - | - |
| 5/12/2025 | 304140005 | 5 | 04/30/2025 | 5 | 24,508,011.66 | - | - | - | - |
| 5/12/2025 | 304101392 | 6 | 05/06/2025 | 2 | 25,778,504.22 | - | - | - | - |
| 4/11/2025 | 304140021 | 21 | 03/25/2025 | 2 | 7,428,747.86 | - | - | - | - |
| 4/11/2025 | 300571333 | 26 | 04/04/2025 | 2 | 5,600,318.71 | - | - | - | - |
| 3/12/2025 | 304140018 | 18 | 03/06/2025 | 5 | 9,788,299.63 | - | - | - | - |
| 3/12/2025 | 304140029 | 29 | 02/28/2025 | 2 | 5,126,957.32 | - | - | - | - |
| 3/12/2025 | 300571331 | 32 | 03/06/2025 | 5 | 4,770,206.49 | - | - | - | - |
| 3/12/2025 | 300571328 | 37 | 03/06/2025 | 5 | 4,001,512.55 | - | - | - | - |
| 3/12/2025 | 304140044 | 44 | 03/06/2025 | 2 | 3,085,086.00 | - | - | - | - |
| 3/12/2025 | 300571324 | 50 | 03/06/2025 | 5 | 2,033,561.79 | - | - | - | - |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 32 of 37 | © Copyright 2025 Citigroup |
| Citigroup Commercial Mortgage Trust 2015-GC31 | ||||||||||
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 | July 11, 2025 | |||||||||
| HISTORICAL UNSCHEDULED PRINCIPAL DETAIL | ||||||||||
| Distribution | Liquidation / | Liquid / Prepay | Principal | Principal | Prepayment Interest | Prepayment | Yield Maintenance | |||
| Date | Loan ID | OMCR | Prepayment Date | Code (5) | Collections | Adjustments | Excess / (Shortfall) | Penalties (PPP) | Penalties (YM) | |
| 3/12/2025 | 300571327 | 7 | 03/06/2025 | 2 | 25,257,522.37 | - | - | - | - | |
| 2/12/2025 | 300571310 | 11 | 02/06/2025 | 5 | 16,740,126.67 | - | - | - | - | |
| 2/12/2025 | 301461017 | 19 | 02/06/2025 | 2 | 8,761,441.70 | - | - | - | - | |
| 2/12/2025 | 304140003 | 3 | 02/06/2025 | 2 | 57,864,351.61 | - | - | - | - | |
| 2/12/2025 | 304140033 | 33 | 02/06/2025 | 5 | 4,304,882.57 | - | - | - | - | |
| 11/13/2024 | 304140030 | 30 | 11/06/2024 | 5 | 5,430,806.62 | - | - | - | - | |
| 5/12/2022 | 304101397 | 17 | 08/06/2021 | 1 | 218,224.17 | - | - | - | - | |
| 11/15/2021 | 304140016 | 16 | 10/15/2021 | 9 | 10,820,594.32 | - | - | - | 1,973,242.03 | |
| 9/13/2021 | 304101372 | 48 | 08/27/2021 | 9 | 2,333,597.23 | - | - | - | 72,353.89 | |
| 9/14/2020 | 304101397 | 17 | 0 | (34,319.71 | ) | - | - | - | - | |
| 9/12/2018 | 304140028 | 28 | 08/28/2018 | 3 | 4,822,832.84 | 1,093,690.89 | - | - | - | |
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 33 of 37 | © Copyright 2025 Citigroup | |||||||
| Citigroup Commercial Mortgage Trust 2015-GC31 | |||||||||||
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 | July 11, 2025 | ||||||||||
| LIQUIDATED LOAN DETAIL | |||||||||||
| Beginning | Most | Liquidation | Net | Net | Realized | Date of | Loss with | ||||
| Scheduled | Recent | Sales | Proceeds | Liquidation | Proceeds | Loss to | Current | Current Cumulative | Cumulative | ||
| Loan ID | OMCR | Balance | Value | Price | Received | Expense | Available | Trust | Adj. to Loan | Adj. to Loan Adj. to Loan | Adj. to Trust |
| No Loans liquidated to Report. | |||||||||||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 34 of 37 | © Copyright 2025 Citigroup | ||||||||
| Citigroup Commercial Mortgage Trust 2015-GC31 | |||||||||||||||
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 | July 11, 2025 | ||||||||||||||
| HISTORICAL LIQUIDATED LOAN | |||||||||||||||
| Beginning | Most | Liquidation | Net | Net | Realized | Date of | Loss with | ||||||||
| Distribution | Scheduled | Recent | Sales | Proceeds | Liquidation | Proceeds | Loss to | Current | Current | Cumulative | Cumulative | ||||
| Date | Loan ID | OMCR | Balance | Value | Price | Received | Expense | Available | Trust | Adj. to Loan | Adj. to Loan Adj. to Loan Adj. to Trust | ||||
| 04/13/2023 | 304140016 | 16 | - | - | - | - | - | - | - | 600.00 | - | - | |||
| 08/12/2022 | 304140028 | 28 | - | - | - | - | - | - | (57,026.11 | ) | - | - | (57,026.11 | ) | |
| 11/15/2021 | 304140016 | 16 | 10,840,353.25 | 31,900,000.00 | - | 13,078,247.35 | 2,237,894.10 | 10,840,353.25 | - | - | - | - | |||
| 09/12/2018 | 304140028 | 28 | 5,924,901.16 | 3,875,000.00 | - | 5,400,800.31 | 569,590.04 | 4,831,210.27 | 1,093,690.89 | - | - | 1,093,690.89 | |||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 35 of 37 | © Copyright 2025 Citigroup | ||||||||||||
| Citigroup Commercial Mortgage Trust 2015-GC31 | |||||
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 | July 11, 2025 | ||||
| CREFC® INVESTOR REPORTING PACKAGE LEGENDS | |||||
| 1|CREFC Investor Reporting Package Legends | |||||
| Property Type (1) | Workout Strategy (3) | Liquidation/Prepayment Code (5) | |||
| MF | Multifamily | 1 | Modification | 1 | Partial Liquidation (Curtailment) |
| RT | Retail | 2 | Foreclosure | 2 | Payoff Prior To Maturity |
| HC | HealthCare | 3 | Bankruptcy | 3 | Disposition / Liquidation |
| IN | Industrial | 4 | Extension | 4 | Repurchase / Substitution |
| MH | Mobile Home Park | 5 | Note Sale | 5 | Full Payoff At Maturity |
| OF | Office | 6 | DPO | 6 | DPO |
| MU | Mixed Use | 7 | REO | 7 | Liquidation prior to 7/1/2006 |
| LO | Lodging | 8 | Resolved | 8 | Payoff With Penalty |
| SS | Self Storage | 9 | Pending Return to Master Servicer | 9 | Payoff With Yield Maintenance |
| SE | Securities | 10 | Deed In Lieu of Foreclosure | 10 | Curtailment With Penalty |
| CH | Cooperative Housing | 11 | Full Payoff | 11 | Curtailment With Yield Maintenance |
| ZZ | Missing Information | 12 | Reps and Warranties | ||
| SF | SF | 13 | TBD | ||
| WH | Warehouse | 98 | Other | ||
| OT | Other | ||||
| Modification Code (4) | |||||
| Payment Status of Loan (2) | |||||
| 1 | Maturity Date Extension | ||||
| A | In Grace Period | 2 | Amortization Change | ||
| B | Late, but less than 30 Days | 3 | Principal Write-Off | ||
| 0 | Current | 4 | Blank (formerly Combination) | ||
| 1 | 30-59 Days Delinquent | 5 | Temporary Rate Reduction | ||
| 2 | 60-89 Days Delinquent | 6 | Capitalization of Interest | ||
| 3 | 90-120 Days Delinquent | 7 | Capitalization of Taxes | ||
| 4 | Performing Matured Balloon | 8 | Other | ||
| 5 | Non Performing Matured Balloon | 9 | Combination | ||
| 6 | 121+ Days Delinquent | 10 | Forbearance | ||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 36 of 37 | © Copyright 2025 Citigroup | ||
| Citigroup Commercial Mortgage Trust 2015-GC31 | |||
| Commercial Mortgage Pass-Through Certificates, Series 2015-GC31 | July 11, 2025 | ||
| NOTES | |||
| No Notes available for this deal at this time. | |||
| Reports Available at sf.citidirect.com | v. 21.09.28 | Page 37 of 37 | © Copyright 2025 Citigroup |