Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STATEMENT TO NOTEHOLDERS

October 20, 2025


TRANSACTION PARTIES


Depositor:	Citigroup Commercial Mortgage Securities Inc.
Master Servicer:	Midland Loan Services, a Division of PNC Bank N.A.
Special Servicer:	Rialto Capital Advisors, LLC
Asset Representations Reviewer /
	Pentalpha Surveillance LLC.
Operating Advisor:
Trustee:	Wilmington Trust, National Association
Certificate Administrator:	Citibank, N.A.




	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	16
8	.	Delinquency Loan Detail	18
9	.	Collateral Performance Delinquency and Loan Status Detail	19
10	.	Appraisal Reduction Detail	20
11	.	Historical Appraisal Reduction Detail	21
12	.	Loan Modification Detail	22
13	.	Historical Loan Modification Detail	23
14	.	Specially Serviced Loan Detail	24
15	.	Historical Specially Serviced Loan Detail	25
16	.	Unscheduled Principal Detail	27
17	.	Historical Unscheduled Principal Detail	28
18	.	Liquidated Loan Detail	29
19	.	Historical Liquidated Loan Detail	30
20	.	CREFC Investor Reporting Package Legends	31
21	.	Notes	32


Reports Available at sf.citidirect.com	v. 21.09.28	Page 1 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DISTRIBUTION SUMMARY

October 20, 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

A-1	19,800,000.00	5,453,523.22	1.357000	%	30/360	6,167.03	-	390,891.15	397,058.18	-	-		5,062,632.07
A-2	138,050,000.00	138,050,000.00	2.588000	%	30/360	297,727.83	-	-	297,727.83	-	-		138,050,000.00
A-3	23,220,000.00	23,220,000.00	2.703000	%	30/360	52,303.05	-	-	52,303.05	-	-		23,220,000.00
A-4	215,000,000.00	215,000,000.00	2.420000	%	30/360	433,583.33	-	-	433,583.33	-	-		215,000,000.00
A-5	575,676,000.00	575,676,000.00	2.669000	%	30/360	1,280,399.37	-	-	1,280,399.37	-	-		575,676,000.00
A-AB	23,526,000.00	23,526,000.00	2.615000	%	30/360	51,267.07	-	-	51,267.07	-	-		23,526,000.00
A-S	142,182,000.00	142,182,000.00	2.892000	%	30/360	342,658.62	-	-	342,658.62	-	-		142,182,000.00
B	63,981,000.00	63,981,000.00	2.748000	%	30/360	146,516.49	-	-	146,516.49	-	-		63,981,000.00
C	60,428,000.00	60,428,000.00	3.195000	%	30/360	160,889.55	-	-	160,889.55	-	-		60,428,000.00
D	37,322,000.00	37,322,000.00	2.250000	%	30/360	69,978.75	-	-	69,978.75	-	-		37,322,000.00
E	26,659,000.00	26,659,000.00	2.250000	%	30/360	49,985.62	-	-	49,985.62	-	-		26,659,000.00
F	26,660,000.00	26,660,000.00	2.250000	%	30/360	49,987.50	-	-	49,987.50	-	-		26,660,000.00
G	14,218,000.00	14,218,000.00	2.250000	%	30/360	26,658.75	-	-	26,658.75	-	-		14,218,000.00
H	55,095,655.00	55,095,655.00	2.250000	%	30/360	91,060.07	-	-	91,060.07	-	-		55,095,655.00
R	-	-	0.000000	%	30/360	-	-	-	-	-	-		-
S	-	-	0.000000	%	30/360	-	-	-	-	-	-		-
VRR Interest	74,832,509.00	74,077,431.23	0.000000	%	30/360	208,830.91	-	20,573.22	229,404.13	-	-		74,056,858.01
Total	1,496,650,164	1,481,548,609				3,268,013.94	-	411,464.37	3,679,478.31	-	-		1,481,137,145
Notional
X-A	1,137,454,000	1,123,107,523	0.760538	%	30/360	711,804.89	-	-	711,804.89	-	(390,891.15	)	1,122,716,632
X-B	124,409,000.00	124,409,000.00	0.428230	%	30/360	44,396.37	-	-	44,396.37	-	-		124,409,000.00
X-D	63,981,000.00	63,981,000.00	1.143347	%	30/360	60,960.39	-	-	60,960.39	-	-		63,981,000.00
X-F	26,660,000.00	26,660,000.00	1.143347	%	30/360	25,401.36	-	-	25,401.36	-	-		26,660,000.00
X-G	14,218,000.00	14,218,000.00	1.143347	%	30/360	13,546.76	-	-	13,546.76	-	-		14,218,000.00
X-H	55,095,655.00	55,095,655.00	1.143347	%	30/360	52,494.54	-	-	52,494.54	-	-		55,095,655.00
Total	1,421,817,655	1,407,471,178				908,604.31	-	-	908,604.31	-	(390,891.15	)	1,407,080,287

Grand Total	2,918,467,819	2,889,019,788				4,176,618.25	-	411,464.37	4,588,082.62	-	(390,891.15	)	2,888,217,432


Reports Available at sf.citidirect.com	v. 21.09.28	Page 2 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DISTRIBUTION SUMMARY - FACTORS

October 20, 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

A-1	08163	MAA5	09/30/2025	0.31146616	-	19.74197727	20.05344343	-	-	255.68848838
A-2	08163	MAB3	09/30/2025	2.15666664	-	-	2.15666664	-	-	1,000.00000000
A-3	08163	MAC1	09/30/2025	2.25250000	-	-	2.25250000	-	-	1,000.00000000
A-4	08163	MAD9	09/30/2025	2.01666665	-	-	2.01666665	-	-	1,000.00000000
A-5	08163	MAE7	09/30/2025	2.22416667	-	-	2.22416667	-	-	1,000.00000000
A-AB	08163	MAF4	09/30/2025	2.17916645	-	-	2.17916645	-	-	1,000.00000000
A-S	08163	MAH0	09/30/2025	2.41000000	-	-	2.41000000	-	-	1,000.00000000
B	08163	MAJ6	09/30/2025	2.29000000	-	-	2.29000000	-	-	1,000.00000000
C	08163	MAK3	09/30/2025	2.66250000	-	-	2.66250000	-	-	1,000.00000000
D	08163MAW7 U0744XAF2		09/30/2025	1.87500000	-	-	1.87500000	-	-	1,000.00000000
E	08163MAY3 U0744XAG0		09/30/2025	1.87499981	-	-	1.87499981	-	-	1,000.00000000
F	08163MBA4 U0744XAH8		09/30/2025	1.87500000	-	-	1.87500000	-	-	1,000.00000000
G	08163MBC0 U0744XAJ4		09/30/2025	1.87500000	-	-	1.87500000	-	-	1,000.00000000
H	08163MBE6 U0744XAK1		09/30/2025	1.65276318	-	-	1.65276318	-	-	1,000.00000000
R	08163	MBJ5	09/30/2025	-	-	-	-	-	-	-
S	00163	MBH9	09/30/2025	-	-	-	-	-	-	-
VRR Interest	08163	MBM8	09/30/2025	2.79064424	-	0.27492356	3.06556780	-	-	989.63483918
X-A	08163	MAG2	09/30/2025	0.62578785	-	-	0.62578785	-	-	987.04354820
X-B	08163MAL1 U0744XAA3		09/30/2025	0.35685819	-	-	0.35685819	-	-	1,000.00000000
X-D	08163MAN7 U0744XAB1		09/30/2025	0.95278895	-	-	0.95278895	-	-	1,000.00000000
X-F	08163MAQ0 U0744XAC9		09/30/2025	0.95278920	-	-	0.95278920	-	-	1,000.00000000
X-G	08163MAS6 U0744XAD7		09/30/2025	0.95278942	-	-	0.95278942	-	-	1,000.00000000
X-H	08163MAU1 U0744XAE5		09/30/2025	0.95278911	-	-	0.95278911	-	-	1,000.00000000


Reports Available at sf.citidirect.com	v. 21.09.28	Page 3 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DISTRIBUTION INFORMATION - INTEREST DETAIL

October 20, 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

A-1	1.35700	%	1.35700	%	1.35700	%	09/01-09/30	6,167.03	-	-	-	-	6,167.03	-	-	6,167.03
A-2	2.58800	%	2.58800	%	2.58800	%	09/01-09/30	297,727.83	-	-	-	-	297,727.83	-	-	297,727.83
A-3	2.70300	%	2.70300	%	2.70300	%	09/01-09/30	52,303.05	-	-	-	-	52,303.05	-	-	52,303.05
A-4	2.42000	%	2.42000	%	2.42000	%	09/01-09/30	433,583.33	-	-	-	-	433,583.33	-	-	433,583.33
A-5	2.66900	%	2.66900	%	2.66900	%	09/01-09/30	1,280,399.37	-	-	-	-	1,280,399.37	-	-	1,280,399.37
A-AB	2.61500	%	2.61500	%	2.61500	%	09/01-09/30	51,267.07	-	-	-	-	51,267.07	-	-	51,267.07
A-S	2.89200	%	2.89200	%	2.89200	%	09/01-09/30	342,658.62	-	-	-	-	342,658.62	-	-	342,658.62
B	2.74800	%	2.74800	%	2.74800	%	09/01-09/30	146,516.49	-	-	-	-	146,516.49	-	-	146,516.49
C	3.19500	%	3.19500	%	3.19500	%	09/01-09/30	160,889.55	-	-	-	-	160,889.55	-	-	160,889.55
D	2.25000	%	2.25000	%	2.25000	%	09/01-09/30	69,978.75	-	-	-	-	69,978.75	-	-	69,978.75
E	2.25000	%	2.25000	%	2.25000	%	09/01-09/30	49,985.62	-	-	-	-	49,985.62	-	-	49,985.62
F	2.25000	%	2.25000	%	2.25000	%	09/01-09/30	49,987.50	-	-	-	-	49,987.50	-	-	49,987.50
G	2.25000	%	2.25000	%	2.25000	%	09/01-09/30	26,658.75	-	-	-	-	26,658.75	-	-	26,658.75
H	2.25000	%	2.25000	%	2.25000	%	09/01-09/30	103,304.35	-	-	13,077.43	-	91,060.07	-	-	91,060.07
R	0.00000	%	0.00000	%	0.00000	%	09/01-09/30	-	-	-	-	-	-	-	-	-
S	0.00000	%	0.00000	%	0.00000	%	09/01-09/30	-	-	-	-	-	-	-	-	-
VRR Interest	0.00000	%	0.00000	%	0.00000	%	09/01-09/30	208,830.91	-	-	-	-	208,830.91	-	-	208,830.91
Total								3,280,258.22	-	-	13,077.43	-	3,268,013.94	-	-	3,268,013.94
Notional
X-A	0.77577	%	0.76054	%	0.76054	%	09/01-09/30	711,804.89	-	-	-	-	711,804.89	-	-	711,804.89
X-B	0.42737	%	0.42823	%	0.42823	%	09/01-09/30	44,396.37	-	-	-	-	44,396.37	-	-	44,396.37
X-D	1.14249	%	1.14335	%	1.14335	%	09/01-09/30	60,960.39	-	-	-	-	60,960.39	-	-	60,960.39
X-F	1.14249	%	1.14335	%	1.14335	%	09/01-09/30	25,401.36	-	-	-	-	25,401.36	-	-	25,401.36
X-G	1.14249	%	1.14335	%	1.14335	%	09/01-09/30	13,546.76	-	-	-	-	13,546.76	-	-	13,546.76
X-H	1.14249	%	1.14335	%	1.14335	%	09/01-09/30	52,494.54	-	-	-	-	52,494.54	-	-	52,494.54
Total								908,604.31	-	-	-	-	908,604.31	-	-	908,604.31

Grand Total								4,188,862.53	-	-	13,077.43	-	4,176,618.25	-	-	4,176,618.25


Reports Available at sf.citidirect.com	v. 21.09.28	Page 4 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DISTRIBUTION INFORMATION - INTEREST SHORTFALL DETAIL

October 20, 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

A-1	-	-	-	-	-	-	-	-	-	-	-	-	-
A-2	-	-	-	-	-	-	-	-	-	-	-	-	-
A-3	-	-	-	-	-	-	-	-	-	-	-	-	-
A-4	-	-	-	-	-	-	-	-	-	-	-	-	-
A-5	-	-	-	-	-	-	-	-	-	-	-	-	-
A-AB	-	-	-	-	-	-	-	-	-	-	-	-	-
A-S	-	-	-	-	-	-	-	-	-	-	-	-	-
B	-	-	-	-	-	-	-	-	-	-	-	-	-
C	-	-	-	-	-	-	-	-	-	-	-	-	-
D	-	-	-	-	-	-	-	-	-	-	-	-	-
E	-	-	-	-	-	-	-	-	-	-	-	-	-
F	-	-	-	-	-	-	-	-	-	-	-	-	-
G	-	-	-	-	-	-	-	-	-	-	-	-	-
H	-	-	-	444,346.65	833.15	12,244.28	-	457,424.08	-	-	-	-	-
R	-	-	-	-	-	-	-	-	-	-	-	-	-
S	-	-	-	-	-	-	-	-	-	-	-	-	-
VRR Interest	-	-	-	-	-	-	-	-	-	-	-	-	-
Total	-	-	-	444,346.65	833.15	12,244.28	-	457,424.08	-	-	-	-	-
Notional
X-A	-	-	-	-	-	-	-	-	-	-	-	-	-
X-B	-	-	-	-	-	-	-	-	-	-	-	-	-
X-D	-	-	-	-	-	-	-	-	-	-	-	-	-
X-F	-	-	-	-	-	-	-	-	-	-	-	-	-
X-G	-	-	-	-	-	-	-	-	-	-	-	-	-
X-H	-	-	-	-	-	-	-	-	-	-	-	-	-
Total	-	-	-	-	-	-	-	-	-	-	-	-	-

Grand Total	-	-	-	444,346.65	833.15	12,244.28	-	457,424.08	-	-	-	-	-


Reports Available at sf.citidirect.com	v. 21.09.28	Page 5 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DISTRIBUTION INFORMATION - PRINCIPAL DETAIL

October 20, 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

A-1	5,453,523.22	390,891.15	-	-	-	5,062,632.07	-	1.32	%	0.34	%	30.00	%	30.31	%
A-2	138,050,000.00	-	-	-	-	138,050,000.00	-	9.22	%	9.32	%	30.00	%	30.31	%
A-3	23,220,000.00	-	-	-	-	23,220,000.00	-	1.55	%	1.57	%	30.00	%	30.31	%
A-4	215,000,000.00	-	-	-	-	215,000,000.00	-	14.37	%	14.52	%	30.00	%	30.31	%
A-5	575,676,000.00	-	-	-	-	575,676,000.00	-	38.46	%	38.87	%	30.00	%	30.31	%
A-AB	23,526,000.00	-	-	-	-	23,526,000.00	-	1.57	%	1.59	%	30.00	%	30.31	%
A-S	142,182,000.00	-	-	-	-	142,182,000.00	-	9.50	%	9.60	%	20.00	%	20.21	%
B	63,981,000.00	-	-	-	-	63,981,000.00	-	4.27	%	4.32	%	15.50	%	15.66	%
C	60,428,000.00	-	-	-	-	60,428,000.00	-	4.04	%	4.08	%	11.25	%	11.37	%
D	37,322,000.00	-	-	-	-	37,322,000.00	-	2.49	%	2.52	%	8.63	%	8.72	%
E	26,659,000.00	-	-	-	-	26,659,000.00	-	1.78	%	1.80	%	6.75	%	6.82	%
F	26,660,000.00	-	-	-	-	26,660,000.00	-	1.78	%	1.80	%	4.88	%	4.93	%
G	14,218,000.00	-	-	-	-	14,218,000.00	-	0.95	%	0.96	%	3.88	%	3.92	%
H	55,095,655.00	-	-	-	-	55,095,655.00	-	3.68	%	3.72	%	0.00	%	0.00	%
R	-	-	-	-	-	-	-	0.00	%	0.00	%	0.00	%	0.00	%
S	-	-	-	-	-	-	-	0.00	%	0.00	%	0.00	%	0.00	%
VRR Interest	74,077,431.23	20,573.22	-	-	-	74,056,858.01	-	5.00	%	5.00	%	0.00	%	0.00	%

Total	1,481,548,609.45	411,464.37	-	-	-	1,481,137,145.08	-	99.98	%	100.00	%


Reports Available at sf.citidirect.com	v. 21.09.28	Page 6 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

RECONCILIATION DETAIL

October 20, 2025


SOURCE OF FUNDS			ALLOCATION OF FUNDS

Interest Funds Available			Scheduled Fees
Scheduled Interest	4,205,008.60		Servicing Fee	6,266.47
Prepayment Interest Shortfall	-		Trustee/Certificate Administrator Fee	7,284.33
Interest Adjustments	-		Operating Advisor Fee	1,024.77
ASER Amount	-		Asset Representations Reviewer Ongoing Fee	308.66
Realized Loss in Excess of Principal Balance	-		CREFC Intellectual Property Royalty License Fee	617.38
Total Interest Funds Available		4,205,008.60	Total Scheduled Fees		15,501.61
Principal Funds Available			Additional Fees, Expenses, etc.
Scheduled Principal	411,464.37		Additional Servicing Fee	-
Unscheduled Principal Collections	-		Special Servicing Fee	8,854.17
Net Liquidation Proceeds	-		Work-out Fee	2,702.55
Repurchased Principal	-		Liquidation Fee	-
Substitution Principal	-		Trust Fund Expenses	-
Other Principal	-		Trust Advisor Expenses	-
			Reimbursement of Interest on Advances to the Servicer	1,332.02
Total Principal Funds Available		411,464.37
			Borrower Reimbursable Trust Fund Expenses	-
Other Funds Available
			Other Expenses	-
Yield Maintenance Charges	-
Withdrawal of Withheld Amounts from the Interest Reserve			Total Additional Fees, Expenses, etc.		12,888.74
Account	-
			Distributions
Deposit of Withheld Amounts to the Interest Reserve Account	-
			Interest Distribution	4,176,618.25
Total Other Funds Available		-	Principal Distribution	411,464.37
			Yield Maintenance Charge Distribution	-
			Total Distributions		4,588,082.62




Total Funds Available		4,616,472.97
			Total Funds Allocated		4,616,472.97


Reports Available at sf.citidirect.com	v. 21.09.28	Page 7 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

OTHER INFORMATION

Interest Reserve Account Information

October 20, 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
Collateral Information
% of Cut-Off Principal Balance Outstanding	98.963484	%
Controlling Class Information
Controlling Class is Class H.
The Controlling Class Representative is RREF IV Debt AIV, LP.
There Are No Disclosable Special Servicer Fees.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 8 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STRATIFICATION DETAIL

October 20, 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	5	171,377,360.68	11.57	3.3816	16	2.679172
61 to 90 Months	57	1,309,759,784.40	88.43	3.4091	73	2.681232
91 Months or Greater	0	0.00	0.00	0.0000	0	0.000000
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993

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	4	68,694,178.41	4.64	3.2256	72	1.025405
1.251 to 1.500	4	124,923,732.52	8.43	3.6327	51	1.479783
1.501 to 1.750	4	97,500,000.00	6.58	3.8811	73	1.581979
1.751 to 2.000	6	94,029,231.31	6.35	3.2335	73	1.826607
2.001 to 2.250	9	136,281,890.30	9.20	3.8641	73	2.158893
2.251 to 2.500	8	181,946,711.00	12.28	3.9118	63	2.407375
2.501 to 2.750	5	131,715,260.82	8.89	3.3330	74	2.564801
2.751 to 3.000	3	56,975,000.00	3.85	3.3533	63	2.896406
3.001 to 3.250	4	90,355,324.43	6.10	3.1662	73	3.166139
3.251 to 3.500	6	261,640,816.29	17.66	3.0118	73	3.430300
3.501 to 3.750	4	168,150,000.00	11.35	2.8105	45	3.623095
3.751 to 4.000	0	0.00	0.00	0.0000	0	0.000000
4.001 or Greater	5	68,925,000.00	4.65	3.9421	73	5.248259
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993


Reports Available at sf.citidirect.com	v. 21.09.28	Page 9 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STRATIFICATION DETAIL

October 20, 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	5	15,761,224.43	1.06	3.6440	73	2.405059
10,000,001 to 15,000,000	4	51,070,260.82	3.45	3.5116	72	2.895828
15,000,001 to 20,000,000	12	212,938,288.80	14.38	3.9453	70	2.717712
20,000,001 to 25,000,000	5	112,279,591.86	7.58	3.2379	73	2.840692
25,000,001 to 30,000,000	3	87,690,324.43	5.92	2.7193	72	3.531933
30,000,001 to 35,000,000	3	98,595,777.06	6.66	3.1869	54	2.444622
35,000,001 to 40,000,000	4	157,600,000.00	10.64	3.6212	74	2.547310
40,000,001 to 45,000,000	3	126,434,138.39	8.54	3.1545	54	1.588713
45,000,001 to 50,000,000	3	143,600,000.00	9.70	3.5662	73	2.568106
5,000,001 to 10,000,000	14	106,421,167.45	7.19	3.7483	70	2.374939
50,000,001 to 55,000,000	2	108,846,371.84	7.35	3.5782	72	2.470387
55,000,001 to 60,000,000	2	114,900,000.00	7.76	3.2483	74	2.921488
60,000,001 to 65,000,000	0	0.00	0.00	0.0000	0	0.000000
65,000,001 to 70,000,000	1	70,000,000.00	4.73	2.7920	73	3.490000
70,000,001 to 75,000,000	1	75,000,000.00	5.06	2.8380	13	3.520000
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+	0	0.00	0.00	0.0000	0	0.000000
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993


Reports Available at sf.citidirect.com	v. 21.09.28	Page 10 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STRATIFICATION DETAIL

October 20, 2025


Loan Rate

	Asset	Ending Scheduled	% of			Wtd Avg
Loan Rate Range	Count	Balance	Agg.Bal. WAC WAM			DSCR

4.00 or Less	57	1,417,618,922.79	95.71	3.3419	68	2.629849
4.01 to 4.25	1	2,400,000.00	0.16	4.1000	73	1.570000
4.26 to 4.50	3	41,143,222.29	2.78	4.3649	20	2.250938
4.51 to 4.75	0	0.00	0.00	0.0000	0	0.000000
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	1	19,975,000.00	1.35	5.8870	73	7.330000
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	62	1,481,137,145.08	100.00	3.4059	66	2.680993

Property Type

	Asset	Ending Scheduled	% of			Wtd Avg
Property Type Range	Count	Balance	Agg.Bal. WAC WAM			DSCR

Industrial	7	130,783,825.69	8.83	3.7215	73	2.430727
Lodging	0	0.00	0.00	0.0000	0	0.000000
Mixed Use	7	231,940,816.29	15.66	3.2162	73	2.900591
Multifamily	13	267,329,323.78	18.05	3.3366	72	2.020675
Office	14	407,295,603.15	27.50	3.2493	56	2.944372
Other	7	184,680,849.39	12.47	3.4725	60	2.255066
Retail	12	233,946,726.78	15.80	3.6795	72	3.279846
Self Storage	1	6,660,000.00	0.45	3.5100	74	2.540000
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993


Reports Available at sf.citidirect.com	v. 21.09.28	Page 11 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STRATIFICATION DETAIL

October 20, 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	50	1,211,772,527.29	81.81	3.4482	67	2.888926
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	12	269,364,617.79	18.19	3.2159	63	1.745580
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993

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	61	1,463,645,567.28	98.82	3.4022	66	2.698692
49 Months or Greater	1	17,491,577.80	1.18	3.7200	70	1.200000
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993


Reports Available at sf.citidirect.com	v. 21.09.28	Page 12 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

STRATIFICATION DETAIL

October 20, 2025


State

	Asset	Ending Scheduled	% of			Wtd Avg
State Range	Count	Balance	Agg.Bal. WAC WAM			DSCR

Arizona	1	55,000,000.00	3.71	3.3610	72	3.440000
California	8	145,450,000.00	9.82	3.2677	72	3.114132
Connecticut	2	94,000,000.00	6.35	3.2570	74	2.560000
Florida	3	59,150,000.00	3.99	3.8915	73	2.541919
Georgia	2	21,575,000.00	1.46	5.7789	73	6.934728
Illinois	1	42,500,000.00	2.87	3.7800	74	1.510000
Indiana	1	8,200,000.00	0.55	3.3090	74	4.560000
Kansas	1	9,830,000.00	0.66	3.8900	73	1.930000
Massachusetts	6	211,290,816.29	14.27	2.7623	72	3.549775
Michigan	2	12,700,000.00	0.86	3.6859	74	3.323780
Mississippi	1	9,143,222.29	0.62	4.3200	37	1.500000
N/A	6	191,680,849.39	12.94	3.4981	60	2.402314
New Jersey	5	175,687,354.86	11.86	2.8256	47	2.324261
New York	9	174,714,150.12	11.80	3.6079	73	2.075865
North Carolina	1	13,055,260.82	0.88	3.8080	74	2.660000
Ohio	3	32,080,000.00	2.17	3.8937	55	2.490642
Oregon	1	40,000,000.00	2.70	3.6410	74	3.210000
Rhode Island	2	58,250,000.00	3.93	3.7908	74	2.299871
Tennessee	1	6,660,000.00	0.45	3.5100	74	2.540000
Texas	3	70,498,667.76	4.76	3.8148	74	1.621925
Utah	1	30,400,000.00	2.05	4.3750	13	2.490000
Vermont	1	6,006,823.55	0.41	3.6000	73	0.890000
Virginia	1	13,265,000.00	0.90	3.1800	70	3.080000
Total	62	1,481,137,145.08	100.00	3.4059	66	2.680993


Reports Available at sf.citidirect.com	v. 21.09.28	Page 13 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

MORTGAGE LOAN DETAIL

October 20, 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	)

30508068	10		N/A			10/06/2025	3.24000	%	110,733.70	78,342.39	41,012,480.78	40,934,138.39	11/06/2026	0		0		0
30508200	11	A1	MF	Harrison	NJ	10/01/2025	2.45500	%	87,970.83	-	43,000,000.00	43,000,000.00	12/01/2031	0		0		0
30508148	12		MF		IL	10/06/2025	3.78000	%	133,875.00	-	42,500,000.00	42,500,000.00	12/06/2031	0		98		0
30507887	13	A1	IN	Town of Burrillville	RI	10/06/2025	3.71000	%	123,666.67	-	40,000,000.00	40,000,000.00	12/06/2031	0		0		0
30508193	14	A1	RT	Tualatin	OR	10/05/2025	3.64100	%	121,366.67	-	40,000,000.00	40,000,000.00	12/05/2031	0		0		0
30320459	15	A1	IN			10/06/2025	3.85500	%	128,500.00	-	40,000,000.00	40,000,000.00	12/06/2031	0		0		0
30508186	16		MF	Fort Lee	NJ	10/06/2025	2.62000	%	72,577.18	45,679.82	33,241,456.88	33,195,777.06	12/06/2031	0		0		0
30508108	17		MF	Kew Garden Hills	NY	10/06/2025	2.47000	%	60,941.70	66,980.83	29,607,305.26	29,540,324.43	11/06/2031	0		0		0
30507803	18		OF	Lehi	UT	10/01/2025	4.37500	%	110,833.33	-	30,400,000.00	30,400,000.00	11/01/2026	0		0		0
30507941	19	A2	RT	Concord	CA	10/05/2025	2.99000	%	74,750.00	-	30,000,000.00	30,000,000.00	10/05/2031	0		0		0
30508000	20		N/A			10/06/2025	3.94000	%	53,343.37	-	16,246,711.00	16,246,711.00	11/06/2031	0		0		0
30507995	21		IN	Oregon	OH	10/06/2025	3.97000	%	27,723.83	-	8,380,000.00	8,380,000.00	11/06/2031	0		0		0
30508009	22		OF	Beverly Hills	CA	10/06/2025	2.90100	%	56,086.00	-	23,200,000.00	23,200,000.00	11/06/2031	0		0		0
30508065	23		MU	New York	NY	10/06/2025	3.91000	%	75,267.50	-	23,100,000.00	23,100,000.00	11/06/2031	0		0		0
30508219	24		OF	Sunnyvale	CA	10/06/2025	2.94800	%	51,590.00	-	21,000,000.00	21,000,000.00	12/06/2031	0		0		0
30508187	25		N/A	New York	NY	10/06/2025	3.67000	%	64,225.00	-	21,000,000.00	21,000,000.00	12/06/2031	0		0		0
30508028	26	A3	RT	Los Angeles	CA	10/06/2025	3.49000	%	58,166.67	-	20,000,000.00	20,000,000.00	10/06/2031	0		0		0
30508006	27		RT	Morrow	GA	10/06/2025	5.88700	%	97,994.02	-	19,975,000.00	19,975,000.00	11/06/2031	0		0		0
30508080	28	A2	RT	Audubon	NJ	10/06/2025	3.72000	%	54,327.25	33,341.59	17,524,919.39	17,491,577.80	08/06/2031	0		0		0
30508197	29		MH	El Cajon	CA	10/06/2025	3.84000	%	59,200.00	-	18,500,000.00	18,500,000.00	12/06/2031	0		0		0
30320453	2	A1	OF	Greenwich	CT	10/06/2025	3.25700	%	153,079.00	-	56,400,000.00	56,400,000.00	12/06/2031	0		0		0
30320454	2	A2	OF	Greenwich	CT	10/06/2025	3.25700	%	102,052.67	-	37,600,000.00	37,600,000.00	12/06/2031	0		0		0
30508145	30		MF	North Providence	RI	10/01/2025	3.96800	%	60,346.67	-	18,250,000.00	18,250,000.00	12/01/2031	0		0		0
30508188	31		N/A			10/06/2025	3.32000	%	49,800.00	-	18,000,000.00	18,000,000.00	12/06/2031	0		0		0
30508047	32		N/A			10/06/2025	3.91000	%	58,650.00	-	18,000,000.00	18,000,000.00	11/06/2031	0		0		0
30508070	33		IN	Haverstraw	NY	10/06/2025	3.48000	%	51,837.50	-	17,875,000.00	17,875,000.00	12/06/2031	0		0		0
30320461	34		MF	Los Angeles	CA	10/06/2025	3.76000	%	55,146.67	-	17,600,000.00	17,600,000.00	11/06/2031	0		0		0
30507953	35		OF	Blue Ash	OH	10/01/2025	3.87100	%	51,290.75	-	15,900,000.00	15,900,000.00	11/01/2028	0		0		0
30508142	36		MU	Jackson Heights	NY	10/06/2025	3.98000	%	50,081.67	-	15,100,000.00	15,100,000.00	12/06/2031	0		0		0
30530175	37		RT	Vinton	VA	10/06/2025	3.18000	%	35,152.25	-	13,265,000.00	13,265,000.00	08/06/2031	0		0		0
30508066	38		RT	Gastonia	NC	10/06/2025	3.80800	%	41,493.13	20,306.58	13,075,567.40	13,055,260.82	12/06/2031	0		0		0
30508049	39		OF	Pomona	CA	10/06/2025	3.10000	%	32,937.50	-	12,750,000.00	12,750,000.00	11/06/2031	0		0		0


Reports Available at sf.citidirect.com	v. 21.09.28	Page 14 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

MORTGAGE LOAN DETAIL

October 20, 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	)

30320455	3	A1	OF	Plainsboro	NJ	08/06/2025	2.83800	%	177,375.00	-	75,000,000.00	75,000,000.00	04/06/2031	1		0		0
30508195	40		N/A	Nanuet	NY	10/01/2025	3.99300	%	39,930.00	-	12,000,000.00	12,000,000.00	12/01/2031	0		0		0
30508069	41		RT	Austin	TX	10/06/2025	3.83900	%	31,258.94	17,899.99	9,770,964.60	9,753,064.61	12/06/2031	0		0		0
30508046	42		IN	Topeka	KS	10/06/2025	3.89000	%	31,865.58	-	9,830,000.00	9,830,000.00	11/06/2031	0		0		0
30508052	43		MF	Jackson	MS	09/06/2025	4.32000	%	32,971.91	15,640.65	9,158,862.94	9,143,222.29	11/06/2028	B		0		0
30530176	44		IN	Indianapolis	IN	10/06/2025	3.30900	%	22,611.50	-	8,200,000.00	8,200,000.00	12/06/2031	0		0		0
30530172	45		RT	Mason	OH	10/06/2025	3.85800	%	25,077.00	-	7,800,000.00	7,800,000.00	11/06/2031	0		0		8
30508007	46		OF	West Palm Beach	FL	10/06/2025	3.35000	%	21,077.08	-	7,550,000.00	7,550,000.00	11/06/2031	0		0		0
30530177	47		OF	Houston	TX	10/06/2025	3.89600	%	22,437.93	11,835.69	6,911,067.00	6,899,231.31	12/06/2031	0		0		0
30508144	48		MF	Ann Arbor	MI	10/01/2025	3.65000	%	21,291.67	-	7,000,000.00	7,000,000.00	12/01/2031	0		0		0
30508051	49		MF	Orange	NJ	10/06/2025	3.71000	%	21,641.67	-	7,000,000.00	7,000,000.00	11/06/2031	0		0		0
30507836	4	A5	OF	Cambridge	MA	10/05/2025	2.69250	%	78,531.25	-	35,000,000.00	35,000,000.00	10/05/2031	0		0		0
30507837	4	A6	OF	Cambridge	MA	10/05/2025	2.69250	%	63,161.56	-	28,150,000.00	28,150,000.00	10/05/2031	0		0		0
30508185	5		N/A			10/06/2025	3.24000	%	157,950.00	-	58,500,000.00	58,500,000.00	12/06/2031	0		0		0
30508158	50		SS		TN	10/06/2025	3.51000	%	19,480.50	-	6,660,000.00	6,660,000.00	12/06/2031	0		0		0
30508073	51		IN	Yonkers	NY	10/06/2025	3.58000	%	19,419.53	10,512.94	6,509,338.63	6,498,825.69	12/06/2031	0		0		0
30508106	52		RT	Springfield	VT	10/06/2025	3.60000	%	18,054.96	11,496.99	6,018,320.54	6,006,823.55	11/06/2031	0		0		0
30508192	53		MF	Southfield	MI	10/06/2025	3.73000	%	17,717.50	-	5,700,000.00	5,700,000.00	12/06/2031	0		0		0
30508218	54		MF	Brooklyn	NY	10/06/2025	3.64000	%	12,133.33	-	4,000,000.00	4,000,000.00	12/06/2031	0		0		0
30508010	55		OF	Melbourne	FL	10/06/2025	3.98000	%	11,940.00	-	3,600,000.00	3,600,000.00	11/06/2031	0		0		0
30320462	56		MF	Los Angeles	CA	10/06/2025	4.10000	%	8,200.00	-	2,400,000.00	2,400,000.00	11/06/2031	0		0		0
30508110	57		RT	Newnan	GA	10/06/2025	4.43000	%	5,906.67	-	1,600,000.00	1,600,000.00	11/06/2031	0		0		0
30508191	6		OF		TX	10/06/2025	3.80000	%	170,828.36	99,426.90	53,945,798.74	53,846,371.84	12/06/2031	0		8		0
30530169	7	A1	RT	Tucson	AZ	10/06/2025	3.36100	%	154,045.83	-	55,000,000.00	55,000,000.00	10/06/2031	0		0		0
30508159	8	A1	MF		FL	10/06/2025	3.97000	%	158,800.00	-	48,000,000.00	48,000,000.00	12/06/2031	0		0		0
30508147	9		MU	New York	NY	10/01/2025	3.99000	%	151,620.00	-	45,600,000.00	45,600,000.00	12/01/2031	0		0		0
30320449	A-1-2		MU	Cambridge	MA	10/06/2025	2.79200	%	162,866.67	-	70,000,000.00	70,000,000.00	11/06/2036	0		0		0
30320450	A-1-4		MU	Cambridge	MA	10/06/2025	2.79200	%	116,333.33	-	50,000,000.00	50,000,000.00	11/06/2036	0		0		0
30320451	A-1-9		MU	Cambridge	MA	10/06/2025	2.79200	%	9,681.78	-	4,161,224.43	4,161,224.43	11/06/2036	0		0		0
30320452	A-3-3		MU	Cambridge	MA	10/06/2025	2.79200	%	55,792.52	-	23,979,591.86	23,979,591.86	11/06/2036	0		0		0
Total	Count = 62								4,205,008.60	411,464.37	1,481,548,609.45	1,481,137,145.08


Reports Available at sf.citidirect.com	v. 21.09.28	Page 15 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

NOI DETAIL

October 20, 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

30508068	10		N/A			40,934,138.39	4,460,028.17	3,973,862.97	Not Available	Not Available
30508200	11	A1	MF	Harrison	NJ	43,000,000.00	4,931,552.12	4,742,793.76	01/01/2025	06/30/2025
30508148	12		MF		IL	42,500,000.00	3,765,884.30	2,598,042.69	Not Available	Not Available
30507887	13	A1	IN	Town of Burrillville	RI	40,000,000.00	5,683,544.01	5,805,918.91	01/01/2025	06/30/2025
30508193	14	A1	RT	Tualatin	OR	40,000,000.00	7,733,224.95	7,654,135.08	01/01/2025	06/30/2025
30320459	15	A1	IN			40,000,000.00	5,505,997.15	5,641,719.91	01/01/2025	06/30/2025
30508186	16		MF	Fort Lee	NJ	33,195,777.06	1,965,432.04	1,672,007.04	Not Available	Not Available
30508108	17		MF	Kew Garden Hills	NY	29,540,324.43	5,565,669.34	5,057,093.62	01/01/2025	06/30/2025
30507803	18		OF	Lehi	UT	30,400,000.00	3,372,874.56	3,525,357.16	01/01/2025	06/30/2025
30507941	19	A2	RT	Concord	CA	30,000,000.00	10,680,479.23	11,563,794.46	01/01/2025	06/30/2025
30508000	20		N/A			16,246,711.00	1,572,137.74	1,572,137.74	Not Available	Not Available
30507995	21		IN	Oregon	OH	8,380,000.00	749,937.00	746,173.17	01/01/2025	06/30/2025
30508009	22		OF	Beverly Hills	CA	23,200,000.00	2,345,987.23	2,013,276.44	01/01/2025	06/30/2025
30508065	23		MU	New York	NY	23,100,000.00	2,160,550.13	2,160,550.13	Not Available	Not Available
30508219	24		OF	Sunnyvale	CA	21,000,000.00	2,489,380.81	2,536,664.46	01/01/2025	06/30/2025
30508187	25		N/A	New York	NY	21,000,000.00	1,313,215.60	1,166,611.28	01/01/2025	06/30/2025
30508028	26	A3	RT	Los Angeles	CA	20,000,000.00	7,279,517.15	2,022,604.84	01/01/2025	03/31/2025
30508006	27		RT	Morrow	GA	19,975,000.00	7,761,302.10	9,371,569.69	Not Available	Not Available
30508080	28	A2	RT	Audubon	NJ	17,491,577.80	3,612,214.09	3,448,788.54	01/01/2025	06/30/2025
30508197	29		MH	El Cajon	CA	18,500,000.00	1,632,487.20	1,571,267.88	Not Available	Not Available
30320453	2	A1	OF	Greenwich	CT	56,400,000.00	8,444,399.31	8,678,482.35	07/01/2024	06/30/2025
30320454	2	A2	OF	Greenwich	CT	37,600,000.00	8,444,399.31	8,678,482.35	07/01/2024	06/30/2025
30508145	30		MF	North Providence	RI	18,250,000.00	1,572,750.51	1,654,701.65	07/01/2024	06/30/2025
30508188	31		N/A			18,000,000.00	1,601,010.14	1,652,335.06	04/01/2024	03/31/2025
30508047	32		N/A			18,000,000.00	1,716,307.46	1,716,310.32	Not Available	Not Available
30508070	33		IN	Haverstraw	NY	17,875,000.00	1,927,946.16	1,907,302.63	01/01/2025	06/30/2025
30320461	34		MF	Los Angeles	CA	17,600,000.00	1,237,711.24	1,237,711.24	Not Available	Not Available
30507953	35		OF	Blue Ash	OH	15,900,000.00	1,707,308.41	1,798,529.72	07/01/2024	06/30/2025
30508142	36		MU	Jackson Heights	NY	15,100,000.00	1,189,211.11	1,253,466.40	Not Available	Not Available
30530175	37		RT	Vinton	VA	13,265,000.00	1,402,434.88	1,406,784.07	01/01/2025	06/30/2025
30508066	38		RT	Gastonia	NC	13,055,260.82	1,848,824.22	2,069,003.58	01/01/2025	06/30/2025
30508049	39		OF	Pomona	CA	12,750,000.00	2,014,080.57	2,042,057.36	01/01/2025	06/30/2025
Reports Available at sf.citidirect.com			v. 21.09.28			Page 16 of 32			© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

NOI DETAIL

October 20, 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

30320455	3	A1	OF	Plainsboro	NJ	75,000,000.00	20,862,255.22	21,468,469.04	07/01/2024	06/30/2025
30508195	40		N/A	Nanuet	NY	12,000,000.00	304,258.03	389,614.23	01/01/2025	06/30/2025
30508069	41		RT	Austin	TX	9,753,064.61	1,150,731.14	1,324,408.92	01/01/2025	06/30/2025
30508046	42		IN	Topeka	KS	9,830,000.00	742,931.28	752,012.64	07/01/2024	06/30/2025
30508052	43		MF	Jackson	MS	9,143,222.29	901,428.41	901,428.41	Not Available	Not Available
30530176	44		IN	Indianapolis	IN	8,200,000.00	1,368,637.52	1,399,528.22	01/01/2025	06/30/2025
30530172	45		RT	Mason	OH	7,800,000.00	766,070.42	682,224.68	Not Available	Not Available
30508007	46		OF	West Palm Beach	FL	7,550,000.00	719,982.71	848,202.28	01/01/2025	06/30/2025
30530177	47		OF	Houston	TX	6,899,231.31	791,323.75	834,602.34	07/01/2024	06/30/2025
30508144	48		MF	Ann Arbor	MI	7,000,000.00	843,586.18	1,101,066.05	01/01/2025	06/30/2025
30508051	49		MF	Orange	NJ	7,000,000.00	515,939.50	432,706.54	Not Available	Not Available
30507836	4	A5	OF	Cambridge	MA	35,000,000.00	31,617,475.26	31,016,478.25	01/01/2025	06/30/2025
30507837	4	A6	OF	Cambridge	MA	28,150,000.00	31,617,475.26	31,016,478.25	01/01/2025	06/30/2025
30508185	5		N/A			58,500,000.00	7,141,197.09	7,115,631.12	01/01/2025	06/30/2025
30508158	50		SS		TN	6,660,000.00	643,331.66	613,163.62	07/01/2024	06/30/2025
30508073	51		IN	Yonkers	NY	6,498,825.69	534,623.19	579,836.89	Not Available	Not Available
30508106	52		RT	Springfield	VT	6,006,823.55	512,374.87	453,792.88	01/01/2025	06/30/2025
30508192	53		MF	Southfield	MI	5,700,000.00	462,632.62	514,911.74	01/01/2025	06/30/2025
30508218	54		MF	Brooklyn	NY	4,000,000.00	307,702.69	307,083.30	01/01/2025	06/30/2025
30508010	55		OF	Melbourne	FL	3,600,000.00	322,748.62	328,671.10	01/01/2025	06/30/2025
30320462	56		MF	Los Angeles	CA	2,400,000.00	159,797.44	158,373.99	01/01/2025	06/30/2025
30508110	57		RT	Newnan	GA	1,600,000.00	149,593.92	149,593.92	01/01/2025	06/30/2025
30508191	6		OF		TX	53,846,371.84	4,859,837.51	1,364,103.64	01/01/2025	03/31/2025
30530169	7	A1	RT	Tucson	AZ	55,000,000.00	10,198,300.81	12,006,933.38	01/01/2025	06/30/2025
30508159	8	A1	MF		FL	48,000,000.00	8,127,613.87	8,476,019.36	07/01/2024	06/30/2025
30508147	9		MU	New York	NY	45,600,000.00	3,103,846.02	3,053,505.22	01/01/2025	06/30/2025
30320449	A-1-2		MU	Cambridge	MA	70,000,000.00	78,866,375.00	80,260,914.00	01/01/2025	06/30/2025
30320450	A-1-4		MU	Cambridge	MA	50,000,000.00	78,866,375.00	80,260,914.00	01/01/2025	06/30/2025
30320451	A-1-9		MU	Cambridge	MA	4,161,224.43	78,866,375.00	80,260,914.00	01/01/2025	06/30/2025
30320452	A-3-3		MU	Cambridge	MA	23,979,591.86	78,866,375.00	80,260,914.00	01/01/2025	06/30/2025
Total	Count = 62					1,481,137,145.08	561,878,993.23	561,272,032.51


Reports Available at sf.citidirect.com	v. 21.09.28	Page 17 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

DELINQUENCY LOAN DETAIL

October 20, 2025

Actual

Paid

Current P&I

Total P&I

Cumulative

Other Expense

Payment Workout

Most Recent

Principal

Through

Advances

Accrued Unpaid

Advances

Status

Strategy

Special Serv

Foreclosure

Bankruptcy

REO

Loan ID

OMCR

Balance

Date

(Net of ASER)

Outstanding

Interest Advances

Outstanding

)

Transfer Date

Date

30320455

75,000,000.00

08/06/2025

177,218.75

360,344.79

181,274.06

1,349,911.53

30508052

9,158,862.94

09/06/2025

48,593.48

Total

Count = 2

84,158,862.94

225,812.23

408,938.27

181,274.06

1,349,911.53


Reports Available at sf.citidirect.com	v. 21.09.28	Page 18 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

COLLATERAL PERFORMANCE - DELINQUENCY AND LOAN STATUS DETAIL

–

October 20, 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		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
10/20/2025
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
09/17/2025
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	0		0		0		0		0		0		0		0		0		0		0		0		0			0
08/15/2025
	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	0		0		0		0		1		75,000,000		0		0		0		0		0		0		0			0
07/17/2025
	0.0	%	0.0	%	0.0	%	0.0	%	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	0		0		1		75,000,000		0		0		0		0		0		0		0		0		0			0
06/17/2025
	0.0	%	0.0	%	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	0		0		1		75,000,000		0		0		0		0		0		0		0		0		0			0
05/16/2025
	0.0	%	0.0	%	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
04/17/2025
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
03/17/2025
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
02/18/2025
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		1		30,132,181		0		0		0		0		0		0		0		0		0			0
01/17/2025
	1.6	%	0.0	%	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	1		75,000,000		0		0		0		0		0		0		0		0		0		0		0			0
12/17/2024
	1.6	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%

	0		0		0		0		0		0		0		0		0		0		0		0		0			0
11/18/2024
	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%	0.0	%		0.0	%


Reports Available at sf.citidirect.com	v. 21.09.28	Page 19 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

APPRAISAL REDUCTION DETAIL

October 20, 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

No Loans with Appraisal Reduction Activity.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 20 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL APPRAISAL REDUCTION DETAIL

October 20, 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

No Loans with Appraisal Reduction Activity.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 21 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

LOAN MODIFICATION DETAIL

October 20, 2025


			Modification	Modification
Loan ID	OMCR	Property Name	Date	Code (4)

30530172	45	Shoppes of Mason	04/09/2025	8


Reports Available at sf.citidirect.com	v. 21.09.28	Page 22 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL LOAN MODIFICATION DETAIL

October 20, 2025


Distribution				Modification	Modification
Date	Loan ID	OMCR	Property Name	Date	Code (4)

10/20/2025	30530172	45	Shoppes of Mason	04/09/2025	8
09/17/2025	30530172	45	Shoppes of Mason	04/09/2025	8
08/15/2025	30530172	45	Shoppes of Mason	04/09/2025	8


Reports Available at sf.citidirect.com	v. 21.09.28	Page 23 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

SPECIALLY SERVICED LOAN DETAIL

October 20, 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

30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024


Reports Available at sf.citidirect.com	v. 21.09.28	Page 24 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL SPECIALLY SERVICED LOANS

October 20, 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

10/20/2025	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
09/17/2025	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
08/15/2025	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
07/17/2025	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
06/17/2025	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
05/16/2025	30508148	12	9	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
04/17/2025	30508148	12	9	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
03/17/2025	30508148	12	9	8,263.89	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
02/18/2025	30508148	12	9	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
01/17/2025	30508148	12	9	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
12/17/2024	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
11/18/2024	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
10/18/2024	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
09/17/2024	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
08/16/2024	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
07/17/2024	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
06/17/2024	30508148	12	98	9,149.31	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
05/17/2024	30508148	12	98	8,854.17	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
04/17/2024	30508148	12	98	6,493.06	42,500,000.00	42,500,000.00	63,800,000.00	10/14/2021	03/15/2024
11/18/2024	30508191	6	8	11,838.31	54,900,532.35	54,900,532.35	85,670,000.00		06/23/2023	11/06/2024
10/18/2024	30508191	6	98	11,476.39	54,990,845.34	54,990,845.34	85,670,000.00		06/23/2023
09/17/2024	30508191	6	98	11,878.25	55,086,659.51	55,086,659.51	85,670,000.00		06/23/2023
08/16/2024	30508191	6	98	11,897.49	55,176,365.44	55,176,365.44	85,670,000.00		06/23/2023
07/17/2024	30508191	6	98	11,533.48	55,265,778.79	55,265,778.79	85,670,000.00		06/23/2023
06/17/2024	30508191	6	98	11,937.05	55,360,725.09	55,360,725.09	85,670,000.00		06/23/2023
05/17/2024	30508191	6	98	11,571.65	55,449,537.14	55,449,537.14	85,670,000.00		06/23/2023
04/17/2024	30508191	6	98	11,976.36	55,543,903.37	55,543,903.37	85,670,000.00		06/23/2023
03/15/2024	30508191	6	98	11,223.76	55,632,117.98	55,632,117.98	85,670,000.00		06/23/2023
02/16/2024	30508191	6	98	12,016.67	55,731,772.09	55,819,373.95	85,670,000.00		06/23/2023
01/18/2024	30508191	6	98	12,035.47	55,819,373.95	55,819,373.95	85,670,000.00		06/23/2023
12/15/2023	30508191	6	98	11,666.59	55,906,690.10	55,906,690.10	85,670,000.00		06/23/2023
11/17/2023	30508191	6	98	12,074.14	55,999,613.25	55,999,613.25	85,670,000.00		06/23/2023


Reports Available at sf.citidirect.com	v. 21.09.28	Page 25 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL SPECIALLY SERVICED LOANS

October 20, 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

10/17/2023	30508191	6	98	11,703.90	56,086,341.54	56,086,341.54	85,670,000.00		06/23/2023
09/15/2023	30508191	6	98	12,112.57	56,178,697.59	56,178,697.59	85,670,000.00		06/23/2023
08/17/2023	30508191	6	98	12,131.05	56,264,841.78	56,350,705.01	85,670,000.00		06/23/2023
07/17/2023	30508191	6	98	5,095.48	56,350,705.01	56,442,226.55	85,670,000.00		06/23/2023


Reports Available at sf.citidirect.com	v. 21.09.28	Page 26 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

UNSCHEDULED PRINCIPAL DETAIL

October 20, 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)

No Loans with Unscheduled Principal Activity to Report.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 27 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL UNSCHEDULED PRINCIPAL DETAIL

October 20, 2025


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)

No Loans with Unscheduled Principal Activity to Report.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 28 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

LIQUIDATED LOAN DETAIL

October 20, 2025


		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 29 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

HISTORICAL LIQUIDATED LOAN

October 20, 2025


		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

No Loans liquidated to Report.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 30 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

CREFC® INVESTOR REPORTING PACKAGE LEGENDS

October 20, 2025


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 31 of 32	© Copyright 2025 Citigroup

Benchmark 2021-B31 Mortgage Trust

Commercial Mortgage Pass Through Certificates, Series 2021-B31

NOTES

October 20, 2025

No Notes available for this deal at this time.


Reports Available at sf.citidirect.com	v. 21.09.28	Page 32 of 32	© Copyright 2025 Citigroup

BENCHMARK 2021-B31 MORTGAGE TRUST 10-D