UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)


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

For the fiscal year ended December 31, 2025


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

For the transition period from to__________

333-228597-10

(Commission File Number of issuing entity)

0001894714

(Central Index Key Number of issuing entity)

Benchmark 2021-B31 Mortgage Trust

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

333-228597

(Commission File Number of depositor)

0001258361

(Central Index Key Number of depositor)

Citigroup Commercial Mortgage Securities Inc.

(Exact name of depositor as specified in its charter)

Citi Real Estate Funding Inc.

(Central Index Key Number: 0001701238)

German American Capital Corporation

(Central Index Key Number: 0001541294)

JPMorgan Chase Bank, National Association

(Central Index Key Number: 0000835271)

Goldman Sachs Mortgage Company

(Central Index Key Number: 0001541502)

(Exact name of sponsor as specified in its charter)


		87-4600193
New York		87-4632129
(State or other jurisdiction of incorporation or organization of the issuing entity)		(I.R.S. Employer Identification No.)

c/o Citibank, N.A.

388 Greenwich Street, 26th Floor

New York, New York 10013

(Address of principal executive offices of issuing entity)

(212) 816-4936

Registrant’s telephone number, including area code

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
None

Securities registered pursuant to Section 12(g) of the Act: None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

☐ Yes ☒ No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

☐ Yes ☒ No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

☒ Yes ☐ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Not Applicable

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer	☐	Accelerated filer	☐

Non-accelerated filer	☒	Smaller reporting company	☐

		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. 

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). ☐ Yes ☒ No

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter.

Not Applicable

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.

Not Applicable

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.

Not Applicable

DOCUMENTS INCORPORATED BY REFERENCE

List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980).

Not Applicable

EXPLANATORY NOTES

1 The CX – 350 & 450 Water Street mortgage loan, which represented approximately 9.9% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and one or more companion loan(s) that are held outside the issuing entity. The CX – 350 & 450 Water Street mortgage loan and each of the related companion loan(s) are serviced pursuant to the CAMB 2021-CX2 TSA.

2 The One Memorial Drive mortgage loan, which represented approximately 4.2% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and one or more companion loan(s) that are held outside the issuing entity. The One Memorial Drive mortgage loan and each of the related companion loan(s) are serviced pursuant to the JPMCC 2021-1MEM TSA.

3 The Veranda mortgage loan, which represented approximately 2.0% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and one or more companion loan(s) that are held outside the issuing entity. The Audubon Crossings & Commons mortgage loan, which represented approximately 1.3% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and one or more companion loan(s) that are held outside the issuing entity. The Veranda mortgage loan, the Audubon Crossings & Commons mortgage loan and each of the related companion loan(s) are serviced pursuant to the Benchmark 2021-B30 PSA.

4 The Plaza La Cienega mortgage loan, which represented approximately 1.3% of the initial pool balance of the issuing entity, is part of a loan combination comprised of the subject mortgage loan included in the issuing entity and one or more companion loan(s) that are held outside the issuing entity. The Plaza La Cienega mortgage loan and the related companion loan(s) are serviced pursuant to the 3650R 2021-PF1 PSA.

5 Pursuant to Instruction 3 to Item 1122 of Regulation AB, the report on assessment of compliance with servicing criteria and attestation report on assessment of compliance with servicing criteria of (i) CWCapital Asset Management LLC, as special servicer under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced and (ii) 3650 REIT Loan Servicing LLC, as special servicer under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced, are not included in this report on Form 10-K because each of CWCapital Asset Management LLC and 3650 REIT Loan Servicing LLC performed activities that address the servicing criteria specified in Item 1122(d) of Regulation AB with respect to 5% or less of the pool assets of the issuing entity. This annual report on Form 10-K does not include the reports on assessment of compliance with servicing criteria and attestation reports on assessment of compliance with servicing criteria of Wells Fargo Bank, National Association as certificate administrator under the CAMB 2021-CX2 TSA, the JPMCC 2021-1MEM TSA, the Benchmark 2021-B30 PSA and the 3650R 2021-PF1 PSA, because the certificate administrator under each such pooling and servicing agreement or trust and servicing agreement does not perform any activities that address the servicing criteria specified in Item 1122(d) of Regulation AB with respect to the issuing entity. This annual report on Form 10-K does not include the report on assessment of compliance with servicing criteria and attestation report on assessment of compliance with servicing criteria of Wilmington Trust, National Association, as trustee under the CAMB 2021-CX2 TSA, because there was no relevant servicing criteria applicable to Wilmington Trust, National Association as trustee under the CAMB 2021-CX2 TSA during the year ended December 31, 2025 and, pursuant to the terms of the CAMB 2021-CX2 TSA, the trustee is not required to provide assessment of compliance with applicable servicing criteria and attestation report on assessment of compliance with servicing criteria with respect to any period during which there was no applicable servicing criteria applicable to it.

6 This annual report on Form 10-K does not include the servicer compliance statements of (i) KeyBank National Association, as master servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced, (ii) CWCapital Asset Management LLC, as special servicer under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced and (iii) 3650 REIT Loan Servicing LLC, as special servicer under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced, because each of KeyBank National Association, CWCapital Asset management LLC and 3650 REIT Loan Servicing LLC is an unaffiliated party that services less than 10% of the pool assets of the issuing entity, and therefore is not a “servicer” that meets the criteria in Item 1108(a)(2)(i) through (iii) of Regulation AB. This annual report on Form 10-K does not include the servicer compliance statements of Wells Fargo Bank, National Association as certificate administrator under the CAMB 2021-CX2 TSA, the JPMCC 2021-1MEM TSA, the Benchmark 2021-B30 PSA and the 3650R 2021-PF1 PSA because the certificate administrator under each such pooling and servicing agreement or trust and servicing agreement is not a “servicer” that meets the criteria in Item 1108(a)(2)(i) through (iii) of Regulation AB with respect to the issuing entity.

PART I

Item 1. Business.

Omitted.

Item 1A. Risk Factors.

Omitted.

Item 1B. Unresolved Staff Comments.

None.

Item 1C. Cybersecurity.

Omitted.

Item 2. Properties.

Omitted.

Item 3. Legal Proceedings.

Omitted.

Item 4. Mine Safety Disclosures.

Not applicable.

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Omitted.

Item 6. [Reserved]

Omitted.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Omitted.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Omitted.

Item 8. Financial Statements and Supplementary Data.

Omitted.

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

Omitted.

Item 9A. Controls and Procedures.

Omitted.

Item 9B. Other Information.

None.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.

Not Applicable.

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Omitted.

Item 11. Executive Compensation.

Omitted.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Omitted.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Omitted.

Item 14. Principal Accountant Fees and Services.

Omitted.

ADDITIONAL DISCLOSURE ITEMS REQUIRED BY GENERAL INSTRUCTION J(2)

Item 1112(b) of Regulation AB

No mortgage loan in the pool assets for Benchmark 2021-B31 Mortgage Trust constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB.

Item 1114(b)(2) and Item 1115(b) of Regulation AB

No entity or group of affiliated entities provides any external credit enhancement, uses any derivative instruments or other support for the certificates within this transaction.

Item 1117 of Regulation AB

Disclosure from Wilmington Trust, National Association (“WTNA”) (i) as Trustee and (ii) as trustee under the CAMB 2021-CX2 TSA pursuant to which the CX - 350 & 450 Water Street mortgage loan is serviced:

On February 3, 2026, certain investors served WTNA with a civil complaint, filed in the Supreme Court of the State of New York, County of New York, for an unspecified amount of damages arising from alleged breaches of contract and duties related to WTNA’s roles as custodian and indenture trustee for certain Tricolor Holdings, LLC asset-backed securitization transactions. The plaintiffs generally assert causes of action related to WTNA’s purported failure to comply with certain provisions related to waterfall payments, servicing transition costs and post-event of default duties and related to WTNA’s purported failure to perform certain actions as custodian with respect to the related receivables. WTNA intends to vigorously defend itself against this legal action.

Disclosure from U.S. Bank National Association (“U.S. Bank”), as Servicing Function Participant:

U.S. Bank and other large financial institutions have been sued in their capacity as trustee or successor trustee for certain residential mortgage backed securities (“RMBS”) trusts. The complaints, primarily filed by investors or investor groups against U.S. Bank and similar institutions, allege the trustees caused losses to investors as a result of alleged failures by the sponsors, mortgage loan sellers and servicers to comply with the governing agreements for these RMBS trusts. Plaintiffs generally assert causes of action based upon the trustees’ purported failures to enforce repurchase obligations of mortgage loan sellers for alleged breaches of representations and warranties, notify securityholders of purported events of default allegedly caused by breaches of servicing standards by mortgage loan servicers and abide by a heightened standard of care following alleged events of default.

U.S. Bank denies liability and believes that it has performed its obligations under the RMBS trusts in good faith, that its actions were not the cause of losses to investors, that it has meritorious defenses, and it has contested and intends to continue contesting the plaintiffs’ claims vigorously. However, U.S. Bank cannot assure you as to the outcome of any of the litigation, or the possible impact of these litigations on the trustee or the RMBS trusts.

On March 9, 2018, a law firm purporting to represent fifteen Delaware statutory trusts (the “DSTs”) that issued securities backed by student loans (the “Student Loans”) filed a lawsuit in the Delaware Court of Chancery against U.S. Bank National Association (“U.S. Bank”) in its capacities as indenture trustee and successor special servicer, and three other institutions in their respective transaction capacities, with respect to the DSTs and the Student Loans. This lawsuit is captioned The National Collegiate Student Loan Master Trust I, et al. v. U.S. Bank National Association, et al., C.A. No. 2018-0167-JRS (Del. Ch.) (the “NCMSLT Action”). The complaint, as amended on June 15, 2018, alleged that the DSTs have been harmed as a result of purported misconduct or omissions by the defendants concerning administration of the trusts and special servicing of the Student Loans. Since the filing of the NCMSLT Action, certain Student Loan borrowers have made assertions against U.S. Bank concerning special servicing that appear to be based on certain allegations made on behalf of the DSTs in the NCMSLT Action.

U.S. Bank has filed a motion seeking dismissal of the operative complaint in its entirety with prejudice pursuant to Chancery Court Rules 12(b)(1) and 12(b)(6) or, in the alternative, a stay of the case while other prior filed disputes involving the DSTs and the Student Loans are litigated. On November 7, 2018, the Court ruled that the case should be stayed in its entirety pending resolution of the first-filed cases. On January 21, 2020, the Court entered an order consolidating for pretrial purposes the NCMSLT Action and three other lawsuits pending in the Delaware Court of Chancery concerning the DSTs and the Student Loans, which remains pending.

U.S. Bank denies liability in the NCMSLT Action and believes it has performed its obligations as indenture trustee and special servicer in good faith and in compliance in all material respects with the terms of the agreements governing the DSTs and that it has meritorious defenses. It has contested and intends to continue contesting the plaintiffs’ claims vigorously.

Item 1119 of Regulation AB

Provided previously in the prospectus of the Registrant relating to the issuing entity and filed on December 22, 2021 pursuant to Rule 424(b)(2) of the Securities Act of 1933, as amended.

Item 1122 of Regulation AB

The reports on assessment of compliance with servicing criteria for asset-backed securities and related attestation reports are attached hereto under Item 15.

Item 1123 of Regulation AB

The servicer compliance statements are attached hereto under Item 15.

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a) List the following documents filed as a part of the report:

(1)

Not Applicable

(2)

Not Applicable

(3)

Exhibits listed below are either included or incorporated by reference as indicated below:


Exhibit Number	Description
4.1	Pooling and Servicing Agreement, dated as of December 1, 2021 (the “Benchmark 2021-B31 PSA”), by and among Citigroup Commercial Mortgage Securities Inc., as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer, Rialto Capital Advisors, LLC, as special servicer, Pentalpha Surveillance LLC, as operating advisor and asset representations reviewer, Citibank, N.A., as certificate administrator, and Wilmington Trust, National Association, as trustee (filed as Exhibit 4.1 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein).

4.2	Trust and Servicing Agreement, dated as of November 9, 2021 (the “CAMB 2021-CX2 TSA”), by and among Deutsche Mortgage & Asset Receiving Corporation, as depositor, KeyBank National Association, as master servicer, Situs Holdings, LLC, as special servicer, Park Bridge Lender Services LLC, as operating advisor, Wilmington Trust, National Association, as trustee and Wells Fargo Bank, National Association, as certificate administrator, paying agent and custodian (filed as Exhibit 4.2 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein). (see Explanatory Note #1)


4.3	Trust and Servicing Agreement, dated as of October 14, 2021 (the “JPMCC 2021-1MEM TSA”), by and among J.P. Morgan Chase Commercial Mortgage Securities Corp., as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as servicer, Situs Holdings, LLC, as special servicer, Park Bridge Lender Services LLC, as operating advisor and Wells Fargo Bank, National Association, as certificate administrator and trustee (filed as Exhibit 4.3 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein). (see Explanatory Note #2)

4.4	Pooling and Servicing Agreement, dated as of November 1, 2021 (the “Benchmark 2021-B30 PSA”), by and among Deutsche Mortgage & Asset Receiving Corporation, as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer, CWCapital Asset Management LLC, as special servicer, Park Bridge Lender Services LLC, as operating advisor and asset representations reviewer and Wells Fargo Bank, National Association, as trustee, certificate administrator, paying agent and custodian (filed as Exhibit 4.4 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein). (see Explanatory Note #3)

4.5	Pooling and Servicing Agreement, dated as of November 1, 2021 (the “3650R 2021-PF1 PSA”), by and among 3650 REIT Commercial Mortgage Securities II LLC, as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer, 3650 REIT Loan Servicing LLC, as special servicer, Park Bridge Lender Services LLC, as operating advisor and asset representations reviewer and Wells Fargo Bank, National Association, as certificate administrator and trustee (filed as Exhibit 4.5 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein). (see Explanatory Note #4)


31	Rule 15d-14(d) Certification


33	Reports on assessment of compliance with servicing criteria for asset-backed securities. (see Explanatory Note #5)
33.1	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer

33.2	Report on assessment of compliance with servicing criteria for asset-backed securities, Rialto Capital Advisors, LLC, as special servicer

33.3	Report on assessment of compliance with servicing criteria for asset-backed securities, Pentalpha Surveillance LLC, as operating advisor

33.4	Report on assessment of compliance with servicing criteria for asset-backed securities, Citibank, N.A., as certificate administrator

33.5	Report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as servicing function participant

33.6	Report on assessment of compliance with servicing criteria for asset-backed securities, Wilmington Trust, National Association, as trustee


33.7	Report on assessment of compliance with servicing criteria for asset-backed securities, KeyBank National Association, as servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

33.8	Report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as special servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

33.9	Report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

33.10a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

33.10b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced


33.11	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as servicer under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 33.1)

33.12	Report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as special servicer for the Equus Industrial Portfolio loan combination under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 33.8)

33.13	Report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 33.9)

33.14a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 33.10a)


33.14b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 33.10b)

33.15a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced

33.15b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced

33.16	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.1)

33.17	Report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.9)

33.18a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.10a)


33.18b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.10b)

33.19a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.15a)

33.19b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 33.15b)

33.20	Report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.1)

33.21	Report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.9)

33.22a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.10a)

33.22b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.10b)

33.23a	Report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.15a)

33.23b	Report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 33.15b)

34	Attestation reports on assessment of compliance with servicing criteria for asset-backed securities.

34.1	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer

34.2	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Rialto Capital Advisors, LLC, as special servicer

34.3	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Pentalpha Surveillance LLC, as operating advisor

34.4	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Citibank, N.A., as certificate administrator

34.5	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, U.S. Bank National Association, as servicing function participant

34.6	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wilmington Trust, National Association, as trustee

34.7	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, KeyBank National Association, as servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced


34.8	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as special servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

34.9	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

34.10a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

34.10b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

34.11	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as servicer under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 34.1)

34.12	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Situs Holdings, LLC, as special servicer for the Equus Industrial Portfolio loan combination under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 34.8)

34.13	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 34.9)

34.14a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 34.10a)

34.14b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 34.10b)

34.15a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced

34.15b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced

34.16	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.1)

34.17	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.9)

34.18a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.10a)



34.18b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.10b)

34.19a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.15a)

34.19b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 34.15b)

34.20	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.1)

34.21	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Park Bridge Lender Services LLC, as operating advisor under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.9)

34.22a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as custodian under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.10a)


34.22b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as custodian under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.10b)

34.23a	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Wells Fargo Bank, National Association, as trustee under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.15a)

34.23b	Attestation report on assessment of compliance with servicing criteria for asset-backed securities, Computershare Trust Company, National Association, as servicing function participant of Wells Fargo Bank, National Association, as trustee under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 34.15b)


35	Servicer compliance statements. (see Explanatory Note #6)

35.1	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer

35.2	Servicer compliance statement, Rialto Capital Advisors, LLC, as special servicer

35.3	Servicer compliance statement, Citibank, N.A., as certificate administrator

35.4	Servicer compliance statement, Situs Holdings, LLC, as special servicer under the CAMB 2021-CX2 TSA pursuant to which the CX – 350 & 450 Water Street mortgage loan is serviced

35.5	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as servicer under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 35.1)

35.6	Servicer compliance statement, Situs Holdings, LLC special servicer under the JPMCC 2021-1MEM TSA pursuant to which the One Memorial Drive mortgage loan is serviced (see Exhibit 35.4)

35.7	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the Benchmark 2021-B30 PSA pursuant to which The Veranda mortgage loan and the Audubon Crossings & Commons mortgage loan are serviced (see Exhibit 35.1)



35.8	Servicer compliance statement, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer under the 3650R 2021-PF1 PSA pursuant to which the Plaza La Cienega mortgage loan is serviced (see Exhibit 35.1)


99.1	Mortgage Loan Purchase Agreement, dated as of December 1, 2021, between Citi Real Estate Funding Inc. and Citigroup Commercial Mortgage Securities Inc., pursuant to which Citi Real Estate Funding Inc. sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 99.1 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein).

99.2	Mortgage Loan Purchase Agreement, dated as of December 1, 2021, between German American Capital Corporation and Citigroup Commercial Mortgage Securities Inc., pursuant to which German American Capital Corporation sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 99.2 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein).

99.3	Mortgage Loan Purchase Agreement, dated as of December 1, 2021, between Goldman Sachs Mortgage Company and Citigroup Commercial Mortgage Securities Inc., pursuant to Goldman Sachs Mortgage Company sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 99.3 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein).

99.4	Mortgage Loan Purchase Agreement, dated as of December 1, 2021, between JPMorgan Chase Bank, National Association and Citigroup Commercial Mortgage Securities Inc., pursuant to which JPMorgan Chase Bank, National Association sold certain mortgage loans to Citigroup Commercial Mortgage Securities Inc. (filed as Exhibit 99.4 to the registrant’s Current Report on Form 8-K dated December 22, 2021, and filed by the registrant on December 22, 2021 under Commission File No. 333-228597-10, and is incorporated by reference herein).

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

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: March 30, 2026

Citigroup Commercial Mortgage Securities Inc.

(Depositor)

     /s/ Richard Simpson

    

     Richard Simpson, President

    

BENCHMARK 2021-B31 MORTGAGE TRUST 10-K