10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended March 31, 2025

OR

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

For the transition period from to

Commission file number: 001-37351

National Storage Affiliates Trust

(Exact name of Registrant as specified in its charter)

 

Maryland	46-5053858
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

8400 East Prentice Avenue, 9th Floor

Greenwood Village, Colorado 80111

(Address of principal executive offices) (Zip code)

(720) 630-2600

(Registrant's telephone number including area code)

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

Title of each class	Trading symbols	Name of each exchange on which registered
Common Shares of Beneficial Interest, $0.01 par value per share	NSA	New York Stock Exchange
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share	NSA Pr A	New York Stock Exchange
Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share	NSA Pr B	New York Stock Exchange

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).    Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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 is a shell company (as defined in Rule 12b-2 of the Exchange Act).    

Yes ☐  No ☒

As of May 2, 2025, 76,489,210 common shares of beneficial interest, $0.01 par value per share, were outstanding.

NATIONAL STORAGE AFFILIATES TRUST
TABLE OF CONTENTS
FORM 10-Q
		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements	3
	Condensed Consolidated Balance Sheets as of March 31, 2025 and December 31, 2024 (Unaudited)	3
	Condensed Consolidated Statements of Operations for the Three Months Ended March 31, 2025 and 2024 (Unaudited)	4
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three Months Ended March 31, 2025 and 2024 (Unaudited)	5
	Condensed Consolidated Statements of Changes in Equity for the Three Months Ended March 31, 2025 and 2024 (Unaudited)	6
	Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2025 and 2024 (Unaudited)	8
	Notes to Condensed Consolidated Financial Statements (Unaudited)	10
ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	27
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	42
ITEM 4.	Controls and Procedures	43
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings	43
ITEM 1A.	Risk Factors	43
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	44
ITEM 3.	Defaults Upon Senior Securities	44
ITEM 4.	Mine Safety Disclosures	44
ITEM 5.	Other Information	45
ITEM 6.	Exhibits	45
Signatures		47

2

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED BALANCE SHEETS

(dollars in thousands, except per share amounts)

(Unaudited)

	March 31,		December 31,
	2025		2024
ASSETS
Real estate
Self storage properties	$	5,873,499	$	5,864,134
Less accumulated depreciation	(1,095,918)		(1,051,638)
Self storage properties, net	4,777,581		4,812,496
Cash and cash equivalents	19,266		50,408
Restricted cash	909		345
Debt issuance costs, net	4,921		5,632
Investment in unconsolidated real estate ventures	235,591		246,193
Other assets, net	196,079		218,482
Operating lease right-of-use assets	20,657		20,906
Total assets	$	5,255,004	$	5,354,462
LIABILITIES AND EQUITY
Liabilities
Debt financing	$	3,426,666	$	3,449,087
Accounts payable and accrued liabilities	92,016		98,657
Interest rate swap liabilities	1,196		471
Operating lease liabilities	22,662		22,888
Deferred revenue	20,272		20,012
Total liabilities	3,562,812		3,591,115
Commitments and contingencies (Note 11)
Equity
Preferred shares of beneficial interest, par value $0.01 per share. 50,000,000 authorized, 14,697,845 and 14,695,458 issued (in series) and outstanding at March 31, 2025 and December 31, 2024, respectively, at liquidation preference	340,955		340,895
Common shares of beneficial interest, par value $0.01 per share. 250,000,000 authorized, 76,450,466 and 76,344,661 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	764		763
Additional paid-in capital	1,249,291		1,249,426
Distributions in excess of earnings	(566,346)		(530,652)
Accumulated other comprehensive income	9,315		15,548
Total shareholders' equity	1,033,979		1,075,980
Noncontrolling interests	658,213		687,367
Total equity	1,692,192		1,763,347
Total liabilities and equity	$	5,255,004	$	5,354,462

See notes to condensed consolidated financial statements.

3

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

(Unaudited)

	Three Months Ended March 31,
	2025		2024
REVENUE
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Management fees and other revenue	12,135		9,074
Total revenue	188,354		196,148
OPERATING EXPENSES
Property operating expenses	55,104		54,694
General and administrative expenses	13,145		15,674
Depreciation and amortization	48,116		47,331
Other	4,476		3,492
Total operating expenses	120,841		121,191
OTHER (EXPENSE) INCOME
Interest expense	(40,475)		(38,117)
Equity in (losses) of unconsolidated real estate ventures	(5,739)		(1,630)
Acquisition and integration costs	(2,445)		(507)
Non-operating income	360		98
Gain on sale of self storage properties	1,425		61,173
Other (expense) income, net	(46,874)		21,017
Income before income taxes	20,639		95,974
Income tax expense	(1,120)		(886)
Net income	19,519		95,088
Net income attributable to noncontrolling interests	(6,525)		(36,061)
Net income attributable to National Storage Affiliates Trust	12,994		59,027
Distributions to preferred shareholders	(5,114)		(5,110)
Net income attributable to common shareholders	$	7,880	$	53,917
Earnings per share - basic	$	0.10	$	0.67
Earnings per share - diluted	$	0.10	$	0.65
Weighted average shares outstanding - basic	76,372		80,236
Weighted average shares outstanding - diluted	76,372		138,148
Dividends declared per common share	$	0.57	$	0.56

See notes to condensed consolidated financial statements.

4

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(dollars in thousands)

(Unaudited)

	Three Months Ended March 31,
	2025		2024
Net income	$	19,519	$	95,088
Other comprehensive income (loss)
Unrealized (loss) gain on derivative contracts	(7,799)		20,413
Reclassification of other comprehensive income to interest expense	(3,232)		(9,314)
Other comprehensive (loss) income	(11,031)		11,099
Comprehensive income	8,488		106,187
Comprehensive income attributable to noncontrolling interests	(1,725)		(39,781)
Comprehensive income attributable to National Storage Affiliates Trust	$	6,763	$	66,406

See notes to condensed consolidated financial statements.

5

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(dollars in thousands, except number of shares)

(Unaudited)

											Accumulated
							Additional		Distributions		Other
	Preferred Shares			Common Shares			Paid-in		In Excess Of		Comprehensive		Noncontrolling		Total
	Number	Amount		Number	Amount		Capital		Earnings		(Loss) Income		Interests		Equity
Balances, December 31, 2023	14,685,716	$	340,651	82,285,995	$	823	$	1,509,563	$	(449,907)	$	21,058	$	703,653	$	2,125,841
Redemptions of OP units	—	—		72,802	1		1,025		—		19		(1,426)		(381)
Repurchase of common shares	—	—		(5,491,925)	(55)		(203,518)		—		—		—		(203,573)
Effect of changes in ownership for consolidated entities	—	—		—	—		40,676		—		(620)		(40,056)		—
Equity-based compensation expense	—	—		—	—		109		—		—		1,746		1,855
Issuance of restricted common shares	—	—		8,886	—		—		—		—		—		—
Vesting and forfeitures of restricted common shares, net	—	—		(2,658)	—		(88)		—		—		—		(88)
Equity offering costs	—	—		—	—		(255)		—		—		—		(255)
Preferred share dividends	—	—		—	—		—		(5,110)		—		—		(5,110)
Common share dividends	—	—		—	—		—		(43,751)		—		—		(43,751)
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(33,653)		(33,653)
Other comprehensive income	—	—		—	—		—		—		7,379		3,720		11,099
Net income	—	—		—	—		—		59,027		—		36,061		95,088
Balances, March 31, 2024	14,685,716	$	340,651	76,873,100	$	769	$	1,347,512	$	(439,741)	$	27,836	$	670,045	$	1,947,072

See notes to condensed consolidated financial statements.

6

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(dollars in thousands, except number of shares)

(Unaudited)

											Accumulated
							Additional		Distributions		Other
	Preferred Shares			Common Shares			Paid-in		In Excess Of		Comprehensive		Noncontrolling		Total
	Number	Amount		Number	Amount		Capital		Earnings		(Loss) Income		Interests		Equity
Balances, December 31, 2024	14,695,458	$	340,895	76,344,661	$	763	$	1,249,426	$	(530,652)	$	15,548	$	687,367	$	1,763,347
Issuance of preferred shares upon redemption of preferred units	2,387	60		—	—		(1)		—		—		(59)		—
Redemptions of OP units	—	—		93,661	1		1,059		—		18		(1,078)		—
Effect of changes in ownership for consolidated entities	—	—		—	—		(1,123)		—		(20)		1,143		—
Equity-based compensation expense	—	—		—	—		111		—		—		2,968		3,079
Issuance of restricted common shares	—	—		15,280	—		—		—		—		—		—
Vesting and forfeitures of restricted common shares, net	—	—		(3,136)	—		(90)		—		—		—		(90)
Equity offering costs	—	—		—	—		(91)		—		—		—		(91)
Preferred share dividends	—	—		—	—		—		(5,114)		—		—		(5,114)
Common share dividends	—	—		—	—		—		(43,574)		—		—		(43,574)
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(33,853)		(33,853)
Other comprehensive loss	—	—		—	—		—		—		(6,231)		(4,800)		(11,031)
Net income	—	—		—	—		—		12,994		—		6,525		19,519
Balances, March 31, 2025	14,697,845	$	340,955	76,450,466	$	764	$	1,249,291	$	(566,346)	$	9,315	$	658,213	$	1,692,192

See notes to condensed consolidated financial statements.

7

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollars in thousands)

(Unaudited)

	Three Months Ended March 31,
	2025		2024
OPERATING ACTIVITIES
Net income	$	19,519	$	95,088
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,116		47,331
Amortization of debt issuance costs	1,475		1,709
Amortization of debt premium	(116)		(255)
Gain on sale of self storage properties	(1,425)		(61,173)
Equity-based compensation expense	3,079		1,855
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Distributions from unconsolidated real estate ventures	4,863		5,479
Change in assets and liabilities, net of effects of self storage property acquisitions:
Other assets	9,627		13,010
Accounts payable and accrued liabilities	(5,467)		(5,681)
Deferred revenue	216		(4,992)
Net Cash Provided by Operating Activities	85,626		94,001
INVESTING ACTIVITIES
Acquisition of self storage properties	(12,434)		—
Capital expenditures	(5,731)		(5,374)
Deposits and advances for self storage properties and other acquisitions	(171)		—
Expenditures for corporate furniture, equipment and other	(89)		(230)
Investment in unconsolidated real estate ventures	—		(35,774)
Net proceeds from sale of self storage properties	8,752		608,777
Net Cash (Used In) Provided by Investing Activities	(9,673)		567,399
FINANCING ACTIVITIES
Borrowings under debt financings	134,000		240,000
Redemption of OP units	—		(381)
Repurchase of common shares	—		(203,528)
Principal payments under debt financings	(157,033)		(613,401)
Payment of dividends to common shareholders	(43,574)		(43,751)
Payment of dividends to preferred shareholders	(5,114)		(5,110)
Distributions to noncontrolling interests	(33,709)		(33,809)
Debt issuance costs	(528)		—
Equity offering costs	(573)		(33)
Net Cash Used In Financing Activities	(106,531)		(660,013)
(Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(30,578)		1,387
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	50,753		87,693
End of period	$	20,175	$	89,080

See notes to condensed consolidated financial statements.

8

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollars in thousands)

(Unaudited)

	Three Months Ended March 31,
	2025		2024
Supplemental Cash Flow Information
Cash paid for interest	$	37,268	$	33,605
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Consideration exchanged in property acquisitions
Other net liabilities assumed	60		—
Change in accrued capital spending	260		(125)

See notes to condensed consolidated financial statements.

9

NATIONAL STORAGE AFFILIATES TRUST

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2025

(Unaudited)

1. ORGANIZATION AND NATURE OF OPERATIONS

National Storage Affiliates Trust was organized in the state of Maryland on May 16, 2013 and is a fully integrated, self-administered and self-managed real estate investment trust focused on the self storage sector. As used herein, "NSA," the "Company," "we," "our," and "us" refers to National Storage Affiliates Trust and its consolidated subsidiaries, except where the context indicates otherwise. The Company has elected and believes that it has qualified to be taxed as a real estate investment trust for U.S. federal income tax purposes ("REIT") commencing with its taxable year ended December 31, 2015.

Through its controlling interest as the sole general partner of NSA OP, LP (its "operating partnership"), a Delaware limited partnership formed on February 13, 2013, the Company is focused on the ownership, operation, and acquisition of self storage properties predominantly located within the top 100 metropolitan statistical areas throughout the United States. Pursuant to the operating partnership's Fourth Amended and Restated Agreement of Limited Partnership (the "LP Agreement"), the operating partnership is authorized to issue preferred units, Class A Units ("OP units") and Long-Term Incentive Plan Units ("LTIP units"). The Company also owns certain of its self storage properties through other consolidated subsidiaries of its operating partnership, which the Company refers to as "DownREIT partnerships." The DownREIT partnerships issue equity ownership interests that are intended to be economically equivalent to the Company's OP units ("DownREIT OP units").

The Company owned 816 consolidated self storage properties in 37 states and Puerto Rico with approximately 52.2 million rentable square feet in approximately 410,000 storage units as of March 31, 2025. These properties are managed with local operational focus and expertise.

As of March 31, 2025, the Company also managed through its property management platform an additional portfolio of 259 properties owned by the Company's unconsolidated real estate ventures. These properties contain approximately 18.0 million rentable square feet, configured in approximately 143,000 storage units and located across 24 states. The Company owns a 25% equity interest in each of its unconsolidated real estate ventures.

As of March 31, 2025, the Company operated and held ownership interests in 1,075 self storage properties located across 41 states and Puerto Rico with approximately 70.2 million rentable square feet in approximately 553,000 storage units.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly and year to date periods are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

10

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of the Company is its investment in its operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

As of March 31, 2025, the Company's operating partnership was the primary beneficiary of, and therefore consolidated, 22 partnerships that are considered VIEs, which owned 49 self storage properties. The net book value of the real estate owned by these VIEs was $404.2 million and $407.1 million as of March 31, 2025 and December 31, 2024, respectively. For certain DownREIT partnerships which are subject to fixed rate mortgages payable, the carrying value of such fixed rate mortgages payable held by these VIEs was $172.9 million and $172.9 million as of March 31, 2025 and December 31, 2024, respectively. The creditors of the consolidated VIEs do not have recourse to the Company's general credit.

Revenue Recognition

Rental revenue

Rental revenue consists of space rentals and related fees. Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term.

Other property-related revenue

Other property-related revenue primarily consists of ancillary revenues such as tenant insurance and/or tenant warranty protection-related access fees, sales of storage supplies and truck rentals which are recognized in the period earned.

The Company has tenant insurance and/or tenant warranty protection plan-related arrangements with insurance companies and the Company’s tenants. During the three months ended March 31, 2025 and 2024, the Company recognized $5.9 million and $5.6 million, respectively, of tenant insurance and tenant warranty protection plan revenues.

The Company sells boxes, packing supplies, locks, other retail merchandise and rents moving trucks at its properties. During the three months ended March 31, 2025 and 2024, the Company recognized retail sales of $0.4 million and $0.5 million, respectively.

Management fees and other revenue

Management fees and other revenue consist of property management fees, platform fees, call center fees, acquisition fees, amounts related to the facilitation of tenant warranty protection or tenant insurance programs for certain stores in the Company's consolidated portfolio and unconsolidated real estate ventures, access fees associated with tenant insurance-related arrangements, and profit distributions from the Company's interest in a reinsurance company.

11

With respect to the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture (each as defined in Note 5), the Company provides supervisory and administrative property management services, centralized call center services, and technology platform and revenue management services to the properties in the unconsolidated real estate ventures. The property management fees for the 2016 Joint Venture, the 2018 Joint Venture and the 2023 Joint Venture are equal to 6% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate ventures, and the platform fees are equal to $1,250 per month per unconsolidated real estate venture property. The property management fees for the 2024 Joint Venture are equal to 4% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate venture. With respect to the 2016 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, the call center fee is equal to 1% of each of monthly gross revenues and net sales revenues. During the three months ended March 31, 2025 and 2024, the Company recognized property management fees, call center fees and platform fees of $4.7 million and $4.3 million, respectively.

The Company also earns acquisition fees for properties acquired by the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture. These fees are based on a percentage of the gross capitalization of the acquired assets determined by the members of the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, and are generally earned when the unconsolidated real estate ventures obtain title and control of an acquired property. During the three months ended March 31, 2025 and 2024, the Company recognized no acquisition fees.

The Company provides or makes available tenant insurance or tenant warranty protection programs for tenants at its properties. For certain of the properties in the Company’s consolidated portfolio and unconsolidated real estate ventures, the Company provides such tenant insurance through the Company’s wholly-owned captive insurance company and a separate reinsurance company in which the Company has a partial ownership interest. With respect to properties in the Company’s unconsolidated real estate ventures, the Company receives 50% of all proceeds from tenant insurance and tenant warranty protection programs at each unconsolidated real estate venture property in exchange for facilitating the programs at those properties. During the three months ended March 31, 2025 and 2024, the Company recognized $7.2 million and $4.7 million, respectively, of revenue related to these activities.

Gain on sale of self storage properties

The Company recognizes gains from disposition of properties only upon closing in accordance with the guidance on sales of nonfinancial assets. Profit on real estate sold is recognized upon closing when all, or substantially all, of the promised consideration has been received and is nonrefundable and the Company has transferred control of the facilities to the purchaser.

Investments in Unconsolidated Real Estate Ventures

The Company's investments in its unconsolidated real estate ventures are recorded under the equity method of accounting in the accompanying condensed consolidated financial statements. Under the equity method, the Company's investments in unconsolidated real estate ventures are stated at cost and adjusted for the Company's share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company's ownership interest in the earnings (losses) of the unconsolidated real estate ventures, except for the 2024 Joint Venture, for which the Company follows the hypothetical liquidation at book value ("HLBV") method. The Company follows the "nature of the distribution approach" for classification of distributions from its unconsolidated real estate ventures in its condensed consolidated statements of cash flows. Under this approach, distributions are reported on the basis of the nature of the activity or activities that generated the distributions as either a return on investment, which are classified as operating cash flows, or a return of investment (e.g., proceeds from the unconsolidated real estate ventures' sale of assets) which are reported as investing cash flows.

Noncontrolling Interests

All of the limited partner equity interests ("OP equity") in its operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than its operating partnership. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

12

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interests is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

Allocation of Net Income (Loss)

Effective July 1, 2024, in connection with the Company's internalization of its PRO structure, all outstanding subordinated performance units of our operating partnership ("subordinated performance units'") including all units of the DownREIT partnerships intended to be economically equivalent to the subordinated performance units ("DownREIT subordinated performance units") were converted into OP units and DownREIT OP units, respectively. For periods in which the subordinated performance units were outstanding, the Company allocated GAAP income utilizing the HLBV method, in which income or loss was allocated based on the change in each unitholders' claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. For periods in which the subordinated performance units are not outstanding, the Company allocates GAAP income based on the number of common shares and partnership units (including DownREIT OP units) outstanding.

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income (loss) within equity, as discussed further in Note 12.

Cash and Cash Equivalents

The Company considers all highly-liquid investments purchased with original maturities of three months or less to be cash equivalents. From time to time, the Company maintains cash balances in financial institutions in excess of federally insured limits. The Company has never experienced a loss that resulted from exceeding federally insured limits.

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions resulting from property sales for which we elected to purchase replacement property in accordance with Section 1031 of the Code, and for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

3. SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

Shareholders' Equity

Series A Preferred Shares

The Company's 6.000% cumulative redeemable preferred shares of beneficial interest ("Series A Preferred Shares") rank senior to the Company's common shares with respect to dividend rights and rights upon its liquidation, dissolution or winding up. Dividends on the Series A Preferred Shares, which are payable quarterly in arrears, are cumulative from the date of original issuance in the amount of $1.50 per share each year. The Series A Preferred Shares became redeemable by the Company in October 2022 for a cash redemption price of $25.00 per share, plus accrued but unpaid dividends. The increase in Series A Preferred Shares outstanding from December 31, 2024 to March 31, 2025, was due to the issuance of 2,387 Series A Preferred Shares upon the redemption of an equivalent number of 6.000% Series A-1 Cumulative Redeemable Preferred Units ("Series A-1 preferred units"). As of March 31, 2025 the Company had 9,029,717 Series A Preferred Shares issued and outstanding.

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At the Market ("ATM") Program

On November 19, 2024, the Company and its operating partnership entered into a sales agreement with certain sales agents, forward sellers and forward purchasers, pursuant to which the Company may sell from time to time up to $400.0 million of the Company's common shares in sales deemed to be "at the market offerings" (the "sales agreement"). The sales agreement contemplates that, in addition to the issuance and sale by the Company of offered shares to or through the sale agents, the Company may enter into separate forward sale agreements with any forward purchaser. If the Company enters into a forward sale agreement with any forward purchaser, such forward purchaser will attempt to borrow from third parties and sell, through the related agent, acting as sales agent for such forward purchaser (each, a "forward seller"), offered shares, in an amount equal to the offered shares subject to such forward sale agreement, to hedge such forward purchaser’s exposure under such forward sale agreement. The Company may offer the common shares through the agents, as the Company's sales agents, or, as applicable, as forward seller, or directly to the agents or forward sellers, acting as principals, by means of, among others, ordinary brokers’ transactions on the NYSE or otherwise at market prices prevailing at the time of sale or at negotiated prices.

During the three months ended March 31, 2025, the Company did not sell any common shares through the ATM program. As of March 31, 2025, the Company had $400.0 million of capacity remaining under its most recent ATM Program.

Common Share Repurchase Program

On July 11, 2022, the Company approved a share repurchase program authorizing, but not obligating, the repurchase of up to $400.0 million of the Company's common shares from time to time. On December 1, 2023, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $275.0 million of the Company's common shares from time to time. On November 14, 2024, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $350.0 million of the Company's common shares from time to time. The timing, manner, price and amount of any repurchase transactions will be determined by the Company in its discretion and will be subject to share price, availability, trading volume and general market conditions. Under these programs, the Company did not repurchase any common shares during the three months ended March 31, 2025 and has remaining capacity of approximately $350.3 million.

Noncontrolling Interests

All of the OP equity in the Company's operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the Company's operating partnership. NSA is the general partner of its operating partnership and is authorized to cause its operating partnership to issue additional partner interests, including preferred units, OP units and LTIP units at such prices and on such other terms as it determines in its sole discretion.

As of March 31, 2025 and December 31, 2024, units reflecting noncontrolling interests consisted of the following:

	March 31, 2025	December 31, 2024
Series A-1 preferred units	1,200,211	1,202,598
OP units	52,130,361	52,173,489
LTIP units	899,579	794,926
DownREIT units
DownREIT OP units	5,769,214	5,769,214
Total	59,999,365	59,940,227

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Series A-1 Preferred Units

The Series A-1 preferred units rank senior to OP units and subordinated performance units in the Company's operating partnership with respect to distributions and liquidation. The Series A-1 preferred units have a stated value of $25.00 per unit and receive distributions at an annual rate of 6.000%. These distributions are cumulative. The Series A-1 preferred units are redeemable at the option of the holder after the first anniversary of the date of issuance, which redemption obligations may be satisfied at the Company’s option in cash in an amount equal to the market value of an equivalent number of the Series A Preferred Shares or the issuance of the Series A Preferred Shares on a one-for-one basis, subject to adjustments. Generally, the Series A-1 preferred units become redeemable by the Company beginning ten years after the initial issuance of each Series A-1 preferred unit at a stated value of $25.00 per unit, plus accrued but unpaid distributions. The decrease in Series A-1 preferred units outstanding from December 31, 2024 to March 31, 2025 was due to the redemption of 2,387 Series A-1 preferred units for an equivalent number of Series A Preferred Shares.

OP Units and DownREIT OP units

OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case. The holders of OP units are generally not entitled to elect redemption until one year after the issuance of the OP units. The holders of DownREIT OP units are generally not entitled to elect redemption until five years after the date of the contributor's initial contribution or such later date as may be agreed to by the contributor and the operating partnership.

The decrease in OP units outstanding from December 31, 2024 to March 31, 2025 was due to the redemption of 93,661 OP units for an equal number of common shares, partially offset by the conversion of 50,533 LTIP units into an equivalent number of OP units.

LTIP Units

LTIP units are a special class of partnership interest in the Company's operating partnership that allow the holder to participate in the ordinary and liquidating distributions received by holders of the OP units (subject to the achievement of specified levels of profitability by the Company's operating partnership or the achievement of certain events). LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above.

The increase in LTIP units outstanding from December 31, 2024 to March 31, 2025 was due to the issuance of 155,186 compensatory LTIP units to employees and trustees, net of forfeitures. This increase was partially offset by the conversion of 50,533 LTIP units into an equivalent number of OP units.

4. SELF STORAGE PROPERTIES

Self storage properties are summarized as follows (dollars in thousands):

	March 31, 2025		December 31, 2024
Land	$	1,046,061	$	1,047,416
Buildings and improvements	4,815,383		4,804,789
Furniture and equipment	12,055		11,929
Total self storage properties	5,873,499		5,864,134
Less accumulated depreciation	(1,095,918)		(1,051,638)
Self storage properties, net	$	4,777,581	$	4,812,496

Depreciation expense related to self storage properties amounted to $45.2 million and $45.4 million during the three months ended March 31, 2025 and 2024, respectively.

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5. INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

2024 Joint Venture

On February 13, 2024, a wholly owned subsidiary of the Company (the "2024 NSA Member") entered into an agreement (the "2024 JV Agreement") to form a joint venture (the "2024 Joint Venture") with an affiliate of Heitman Capital Management LLC (the "2024 JV Investor" and, together with the 2024 NSA Member, the "2024 JV Members"). The 2024 Joint Venture was capitalized with approximately $140.8 million in equity (approximately $35.2 million from the 2024 NSA Member in exchange for a 25% ownership interest and approximately $105.6 million from the 2024 JV Investor in exchange for a 75% ownership interest) and proceeds from a $210.0 million interest-only secured debt financing with an interest rate of 6.05% per annum and a term of five years.

A subsidiary of the Company is acting as the non-member manager of the 2024 Joint Venture (the "2024 NSA Manager"). The 2024 NSA Manager directs, manages and controls the day-to-day operations and affairs of the 2024 Joint Venture but may not cause the 2024 Joint Venture to make certain major decisions involving the business of the 2024 Joint Venture without the consent of both 2024 JV Members, including the approval of annual budgets, sales and acquisitions of properties, financings, and certain actions relating to bankruptcy.

In February 2024, pursuant to a contribution agreement executed by the 2024 JV Members on December 21, 2023, in exchange for cash the Company contributed to the 2024 Joint Venture 56 self storage properties located across seven states, consisting of approximately 3.2 million rentable square feet configured in approximately 24,000 storage units.

As of March 31, 2025, the 2024 Joint Venture owned and operated 56 self storage properties containing approximately 3.2 million rentable square feet, configured in approximately 24,000 storage units and located across seven states.

2023 Joint Venture

On December 15, 2023, the Company, through a newly formed subsidiary (the "2023 NSA Member"), entered into an agreement (the "2023 JV Agreement") to form a joint venture (the "2023 Joint Venture") with a state pension fund advised by Heitman Capital Management LLC (the "2023 JV Investor," together with the 2023 NSA Member, the "2023 JV Members") to acquire and operate self storage properties. The 2023 JV Agreement provides for equity capital contributions by the 2023 JV Members of up to $400.0 million over a twenty-four month investment period (subject to two six-month extension options if both of the 2023 JV Members agree) starting in December 2023, with the 2023 JV Investor holding a 75% ownership interest and the 2023 NSA Member holding a 25% ownership interest.

A subsidiary of the Company is acting as the non-member manager of the 2023 Joint Venture (the "2023 NSA Manager"). The 2023 NSA Manager directs, manages and controls the day-to-day operations and affairs of the 2023 Joint Venture but may not cause the 2023 Joint Venture to make certain major decisions involving the business of the 2023 Joint Venture without the consent of both 2023 JV Members, including the approval of annual budgets, sales and acquisitions of properties, financings, and certain actions relating to bankruptcy.

During the three months ended September 2024, the 2023 Joint Venture acquired 18 self storage properties located across two states, consisting of approximately 1.2 million rentable square feet configured in approximately 8,000 storage units for approximately $147.9 million. The 2023 Joint Venture financed the acquisitions with capital contributions from the 2023 JV Members, of which the Company contributed approximately $37.0 million.

As of March 31, 2025, the 2023 Joint Venture owned and operated 18 self storage properties containing approximately 1.2 million rentable square feet, configured in approximately 8,000 storage units and located across two states.

2018 Joint Venture

As of March 31, 2025, the Company's unconsolidated real estate venture, formed in September 2018 with an affiliate of Heitman America Real Estate REIT LLC (the "2018 Joint Venture"), in which the Company has a 25% ownership interest, owned and operated 104 self storage properties containing approximately 7.9 million rentable square feet, configured in approximately 65,000 storage units and located across 17 states.

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2016 Joint Venture

As of March 31, 2025, the Company's unconsolidated real estate venture, formed in September 2016 with a state pension fund advised by Heitman Capital Management LLC (the "2016 Joint Venture"), in which the Company has a 25% ownership interest, owned and operated 81 properties containing approximately 5.7 million rentable square feet, configured in approximately 47,000 storage units and located across 13 states.

The following table presents the combined condensed financial position of the Company's unconsolidated real estate ventures as of March 31, 2025 and December 31, 2024 (dollars in thousands):

	March 31, 2025		December 31, 2024
ASSETS
Self storage properties, net	$	2,703,146	$	2,700,632
Less accumulated depreciation	(465,102)		(445,006)
Self storage properties, net	2,238,044		2,255,626
Other assets	35,884		43,513
Total assets	$	2,273,928	$	2,299,139
LIABILITIES AND EQUITY
Debt financing	$	1,213,458	$	1,213,169
Other liabilities	32,233		37,206
Equity	1,028,237		1,048,764
Total liabilities and equity	$	2,273,928	$	2,299,139

The following tables present the combined condensed operating information of the Company's unconsolidated real estate ventures for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Total revenue	$	61,624	$	56,096
Property operating expenses	(22,416)		(17,603)
Supervisory, administrative and other expenses	(4,041)		(3,658)
Depreciation and amortization	(21,644)		(18,206)
Interest expense	(13,645)		(12,100)
Acquisition and other expenses	(150)		(59)
Net (loss) income	$	(272)	$	4,470

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6. ACQUISITIONS AND DISPOSITIONS

Acquisitions

During three months ended March 31, 2025, the Company acquired three self storage properties and an annex to an existing property for approximately $13.5 million. All of these acquisitions were acquired by the Company from third parties. The self storage property acquisitions were accounted for as asset acquisitions and accordingly, $0.1 million of transaction costs related to the acquisitions were capitalized as part of the basis of the acquired properties. The Company allocated the total purchase price of the acquired properties to the assets acquired and liabilities assumed based on their relative fair values. The Company allocated a portion of the purchase price to identifiable intangible assets consisting of customer in-place leases which were recorded at estimated fair values of $0.3 million resulting in a total fair value of $13.2 million allocated to real estate.

The following table summarizes the investments in self storage property acquisitions completed by the Company during the three months ended March 31, 2025 (dollars in thousands):

Acquisitions closed during the Three Months Ended:		Summary of Investment(1)
	Number of Properties	Cash and Acquisition Costs		Value of Equity		Other		Total
March 31, 2025	3	$	12,434	$	—	$	1,060	$	13,494

(1)Investment amounts include investments classified as annexes to existing properties.

Dispositions

During the three months ended March 31, 2025, the Company sold two self storage properties to third parties for net proceeds of approximately $9.8 million. The Company recorded a net gain on the dispositions of $1.4 million.

7. OTHER ASSETS

Other assets consist of the following (dollars in thousands):

	March 31, 2025		December 31, 2024
Customer in-place leases, net of accumulated amortization of $777 and $380, respectively	$	995	$	1,058
Receivables:
Trade, net	6,835		8,689
Tenant insurance, former PROs and other	8,564		10,169
Receivable from unconsolidated real estate ventures	4,853		8,057
Property acquisition deposits	369		198
Interest rate swaps	12,249		22,596
Prepaid expenses and other	7,859		11,392
Corporate furniture, equipment and other, net	2,726		2,916
Trade names	12,256		12,256
Management contracts, net of accumulated amortization of $9,983 and $9,117, respectively	41,982		42,848
Tenant reinsurance intangible assets, net of accumulated amortization of $7,176 and $6,264, respectively	89,209		90,121
Goodwill	8,182		8,182
Total	$	196,079	$	218,482

Amortization expense related to customer in-place leases amounted to $0.4 million and $1.0 million for the three months ended March 31, 2025 and 2024, respectively. Amortization expense related to management contracts amounted to $1.3 million and $0.3 million for the three months ended March 31, 2025 and 2024, respectively. Amortization expense related to the tenant reinsurance intangible amounted to $0.9 million and $0.3 million for the three months ended March 31, 2025 and 2024, respectively.

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8. DEBT FINANCING

The Company's outstanding debt as of March 31, 2025 and December 31, 2024 is summarized as follows (dollars in thousands):

	Interest Rate(1)		March 31, 2025		December 31, 2024
Credit Facility:
Revolving line of credit	5.71	%	$	420,800	$	443,300
Term loan D	3.96	%	275,000		275,000
Term loan E	4.89	%	130,000		130,000
2028 Term loan facility	4.62	%	75,000		75,000
April 2029 Term loan facility	4.27	%	100,000		100,000
June 2029 Term loan facility	5.37	%	285,000		285,000
May 2026 Senior Unsecured Notes	2.16	%	35,000		35,000
October 2026 Senior Unsecured Notes	6.46	%	65,000		65,000
July 2028 Senior Unsecured Notes	5.75	%	120,000		120,000
September 2028 Senior Unsecured Notes	5.40	%	75,000		75,000
October 2028 Senior Unsecured Notes	6.55	%	100,000		100,000
2029 Senior Unsecured Notes	3.98	%	100,000		100,000
August 2030 Senior Unsecured Notes	2.99	%	150,000		150,000
October 2030 Senior Unsecured Notes	6.66	%	35,000		35,000
November 2030 Senior Unsecured Notes	2.72	%	75,000		75,000
May 2031 Senior Unsecured Notes	3.00	%	90,000		90,000
August 2031 Senior Unsecured Notes	4.08	%	50,000		50,000
September 2031 Senior Unsecured Notes	5.55	%	125,000		125,000
November 2031 Senior Unsecured Notes	2.81	%	175,000		175,000
August 2032 Senior Unsecured Notes	3.09	%	100,000		100,000
November 2032 Senior Unsecured Notes	5.06	%	200,000		200,000
May 2033 Senior Unsecured Notes	3.10	%	55,000		55,000
October 2033 Senior Unsecured Notes	6.73	%	50,000		50,000
November 2033 Senior Unsecured Notes	2.96	%	125,000		125,000
2034 Senior Unsecured Notes	5.74	%	150,000		150,000
2036 Senior Unsecured Notes	3.06	%	75,000		75,000
Fixed rate mortgages payable	3.54	%	200,260		200,793
Total principal			3,436,060		3,459,093
Unamortized debt issuance costs and debt premium, net			(9,394)		(10,006)
Total debt			$	3,426,666	$	3,449,087

(1)Represents the effective interest rate as of March 31, 2025. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.

As of March 31, 2025, the Company's unsecured credit facility provided for total borrowings of $1.355 billion (the "credit facility") consisting of the following components: (i) a revolving line of credit (the "Revolver") which provides for a total borrowing commitment up to $950.0 million, under which the Company may borrow, repay and re-borrow amounts, (ii) a $275.0 million tranche D term loan facility (the "Term Loan D") and (iii) a $130.0 million tranche E term loan facility (the "Term Loan E"). As of March 31, 2025, the Company had an expansion option under the credit facility, which, if exercised in full, would provide for a total borrowing capacity of $1.900 billion.

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As of March 31, 2025, the Company had outstanding letters of credit totaling $6.7 million and would have had the capacity to borrow remaining Revolver commitments of $522.5 million while remaining in compliance with the credit facility's financial covenants. At March 31, 2025, the Company was in compliance with all such covenants.

Future Debt Obligations

Based on existing debt agreements in effect as of March 31, 2025, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (dollars in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs		Total
Remainder of 2025	$	1,651	$	(1,928)	$	(277)
2026	377,322		(2,285)		375,037
2027	638,169		(1,664)		636,505
2028	460,624		(1,369)		459,255
2029	487,789		(649)		487,140
2030	262,964		(376)		262,588
Thereafter	1,207,541		(1,123)		1,206,418
	$	3,436,060	$	(9,394)	$	3,426,666

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9. EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per common share for the three months ended March 31, 2025 and 2024 (dollars in thousands, except per share amounts):

	Three Months Ended March 31,
	2025		2024
Earnings per common share - basic and diluted
Numerator
Net income	$	19,519	$	95,088
Net income attributable to noncontrolling interests	(6,525)		(36,061)
Net income attributable to National Storage Affiliates Trust	12,994		59,027
Distributions to preferred shareholders	(5,114)		(5,110)
Distributed and undistributed earnings allocated to participating securities	(15)		(13)
Net income attributable to common shareholders - basic	7,865		53,904
Effect of assumed conversion of dilutive securities	—		35,218
Net income attributable to common shareholders - diluted	$	7,865	$	89,122
Denominator
Weighted average shares outstanding - basic	76,372		80,236
Effect of dilutive securities:
Weighted average OP units outstanding	—		37,633
Weighted average DownREIT OP unit outstanding	—		2,120
Weighted average LTIP units outstanding	—		128
Weighted average subordinated performance units and DownREIT subordinated performance unit	—		18,031
Weighted average shares outstanding - diluted	76,372		138,148
Earnings per share - basic	$	0.10	$	0.67
Earnings per share - diluted	$	0.10	$	0.65

Outstanding equity interests of the Company's operating partnership and DownREIT partnerships are considered potential common shares for purposes of calculating diluted earnings per share as the unitholders may, through the exercise of redemption rights, obtain common shares, subject to various restrictions. Basic earnings per share is calculated based on the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated by further adjusting for the dilutive impact using the treasury stock method for unvested LTIP units subject to a service condition outstanding during the period and the if-converted method for any convertible securities outstanding during the period.

Generally, following certain lock-out periods, OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, subject to certain adjustments and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case.

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LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above. Certain LTIP units vested prior to or upon the completion of the Company's initial public offering and certain LTIP units have vested upon the satisfaction of a service or market condition or will vest upon the satisfaction of future service and market conditions. Vested LTIP units and unvested LTIP units that vest based on a service or market condition are allocated income or loss in a similar manner as OP units. Unvested LTIP units subject to a service or market condition are evaluated for dilution using the treasury stock method. For the three months ended March 31, 2025, 779,408 unvested LTIP units that vest based on a service or market condition are excluded from the calculation of diluted earnings per share as they are not dilutive to earnings per share.

Effective as of July 1, 2024, in connection with the Company's internalization of its PRO structure, all outstanding subordinated performance units and DownREIT subordinated performance units were converted into OP units and DownREIT OP units, respectively. For periods in which the subordinated performance units were outstanding, the Company calculated the potentially dilutive impact of such units by assuming a hypothetical conversion into OP units and DownREIT OP units and considering the GAAP income that was allocated to such units.

For the three months ended March 31, 2025, potential common shares totaling 58.1 million related to OP units, DownREIT OP units and vested LTIP units have been excluded from the calculation of diluted earnings per share as they are not dilutive to earnings per share.

Participating securities, which consist of unvested restricted common shares, receive dividends equal to those received by common shares. The effect of participating securities for the periods presented above is calculated using the two-class method of allocating distributed and undistributed earnings.

10. RELATED PARTY TRANSACTIONS

Effective July 1, 2024, in connection with the internalization of its PRO structure, the Company purchased the PROs' management contracts. As of March 31, 2025, the majority of operations have transitioned to the Company.

Supervisory and Administrative Fees

During the three months ended March 31, 2024, the Company incurred $5.1 million for supervisory and administrative fees to its former PROs pursuant to their respective management contracts. In connection with the internalization of the PRO structure, the Company entered into new asset management agreements with certain of its former PROs to continue to provide leasing, operating, supervisory and administrative services for certain self storage properties on a transitionary basis. These new asset management agreements generally provided for fees ranging from 5% to 6% of gross revenue for such managed self storage properties. Under the current asset management agreements with former PROs, during the three months ended March 31, 2025, the Company incurred $1.4 million for supervisory and administrative fees. Supervisory and administrative fees are included in general and administrative expenses in the accompanying condensed consolidated statements of operations.

Payroll Services

For the self storage properties that were managed by the Company's former PROs, and pursuant to their respective management contracts and new asset management agreements, the employees responsible for operations were employees of the Company's former PROs who charged the Company for the costs associated with the respective employees. For the three months ended March 31, 2025 and 2024, the Company incurred $1.8 million and $6.9 million, respectively, for payroll and related costs reimbursable to these former PROs. Such costs are included in property operating expenses in the accompanying condensed consolidated statements of operations.

11. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is subject to litigation, claims, and assessments that may arise in the ordinary course of its business activities. Such matters include contractual matters, employment related issues, and regulatory proceedings. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on the Company's financial position, results of operations, or liquidity.

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12. FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The Company sometimes limits its exposure to interest rate fluctuations by entering into interest rate swap agreements. The interest rate swap agreements moderate the Company's exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. The Company does not use derivatives for trading or speculative purposes. The Company measures its interest rate swap derivatives at fair value on a recurring basis. The changes in the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings.

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

				Fair Value
	Number of Contracts	Notional Amount		Other Assets, net		Interest Rate Swap Liabilities
As of March 31, 2025
Interest Rate Swaps	10	$	860,000	$	12,249	$	1,196
As of December 31, 2024
Interest Rate Swaps	12	$	1,085,000	$	22,596	$	471

The following table presents the effect of our derivative instruments on our condensed consolidated financial statements (dollars in thousands):

Fair value at December 31, 2023	$	26,160
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(9,355)
Unrealized gains and realized (losses) on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	20,413
Fair value at March 31, 2024	$	37,218
Fair value at December 31, 2024	$	22,125
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(3,273)
Unrealized and realized losses on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	(7,799)
Fair value at March 31, 2025	$	11,053

As of March 31, 2025 and December 31, 2024, the Company had outstanding interest rate swaps with aggregate current notional amounts of $860.0 million and $1,085.0 million, respectively, designated as cash flow hedges. As of March 31, 2025, the Company's swaps had a weighted average remaining term of approximately 3.0 years.

In connection with the issuance of fixed rate unsecured notes in the second quarter of 2023, we entered into $50.0 million of forward starting interest rate swaps on March 16, 2023, and a $25.0 million forward starting interest rate swap on March 24, 2023, locking the interest rate of compounded SOFR at 3.25% through April 5, 2023. These interest rate swaps have been designated as cash flow hedges. The realized loss of $1.6 million of the compounded SOFR swaps are included in unrealized and realized gains (loss) on derivative instruments in comprehensive income (loss) and will be reclassified into interest expense over 10 years, which is the term of anticipated unsecured fixed rate debt including any replacement debt thereof. Amounts reported in accumulated other comprehensive (loss) income will be reclassified into interest expense as interest payments are made on the anticipated debt.

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The fair value of these swaps are included in other assets and liabilities in the Company's condensed consolidated balance sheets, and the Company recognizes any changes in the fair value as an adjustment of accumulated other comprehensive income (loss) within equity. If the forward rates at March 31, 2025 remain constant, the Company estimates that during the next 12 months, the Company would reclassify into earnings, as a reduction in interest expense, approximately $7.0 million of the unrealized gains included in accumulated other comprehensive income (loss). If market interest rates remain above the 3.08% weighted average fixed rate under these interest rate swaps the Company will continue to receive payments due to it from its counterparties to the interest rate swaps.

There were no transfers between levels of the three-tier fair value measurement hierarchy during the three months ended March 31, 2025 and 2024. For financial assets and liabilities that utilize Level 2 inputs, the Company utilizes both direct and indirect observable price quotes, including applicable yield curves. The Company uses valuation techniques for Level 2 financial assets and liabilities which include applicable yield curves at the reporting date as well as assessing counterparty credit risk. Counterparties to these contracts are highly rated financial institutions. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with the Company's derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by the Company and the counterparties. As of March 31, 2025 and 2024, the Company determined that the effect of credit valuation adjustments on the overall valuation of its derivative positions are not significant to the overall valuation of its derivatives. Therefore, the Company has determined that its derivative valuations are appropriately classified in Level 2 of the fair value hierarchy.

Fair Value Disclosures

The carrying values of cash and cash equivalents, restricted cash, trade receivables, accounts payable and accrued liabilities reflected in the condensed consolidated balance sheets at March 31, 2025 and 2024, approximate fair value due to the short term nature of these financial assets and liabilities. The carrying value of variable rate debt financing, comprising the Revolver, term loans under our credit facility and our term loan facilities, reflected in the condensed consolidated balance sheets at March 31, 2025 and 2024, approximates fair value as the changes in their associated interest rates reflect the current market and credit risk, which is similar to when the loans were originally obtained.

The fair values of fixed rate private placement notes and mortgages were estimated using the discounted estimated future cash payments to be made on such debt; the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality (categorized within Level 2 of the fair value hierarchy).

The following table presents the carrying value and estimated fair value of our fixed rate private placement notes and mortgages (dollars in thousands):

	Carrying Value(1)				Fair Value
	March 31, 2025		December 31, 2024		March 31, 2025		December 31, 2024
Liabilities
Private Placement Notes	$	1,950,000	$	1,950,000	$	1,815,416	$	1,774,291
Mortgage Notes	200,260		200,793		193,394		190,966

(1) Carrying value represents the principal balance outstanding

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13. Segments

The Company manages the business as one reportable segment consisting of owning and managing self storage properties located in the United States. The Company collects rental revenue from customers for space rentals and related fees. Although the Company has several operating segments consisting of self storage properties in different geographic markets, these operating segments have been aggregated into one reportable segment based on the similar economic characteristics among all markets. The Company considers factors such as the physical and economic characteristics of its properties and the related operating activities in determining its operating segments. Operating segments that exhibit similar physical and economic characteristics and other operating similarities have been aggregated. The Company has other operating segments, consisting of activities other than owning and managing self storage properties, that are insignificant based on the guidance set forth in ASC 280, and included under the heading "All Other."

The Company's chief operating decision maker ("CODM") is its President and Chief Executive Officer. The CODM uses net operating income ("NOI") to assess segment performance and allocate resources. NOI is the key measure used by the CODM to evaluate the economic productivity from owning and managing the Company's self storage properties, as it enables the CODM to evaluate the operating performance of the Company's self storage properties on a consistent and comparable basis from period to period.

Reportable segment asset information is not provided to the CODM as the CODM does not use segment asset information to evaluate the business and allocate resources.

The following table presents our reportable segment NOI for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Property operating expenses
Store payroll and related costs	12,914		13,523
Property tax expense	15,917		15,926
Utilities expense	5,724		5,422
Repairs & maintenance expense	5,003		4,297
Marketing expense	5,528		4,799
Insurance expense	2,689		2,751
Other property operating expenses	7,329		7,976
Total property operating expenses	55,104		54,694
Net operating income	$	121,115	$	132,380

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NOI represents rental revenue plus other property-related revenue, minus property operating expenses. NOI excludes management fees and other revenue, general and administrative expenses, depreciation and amortization, interest expense, loss on early extinguishment of debt, equity in losses (earnings) of unconsolidated real estate ventures, acquisition costs, non-operating (income) expense, gain on sale of self storage properties or income tax expense.

The following table is a reconciliation of our reportable segment revenue to total revenue for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Management fees and other revenue	12,135		9,074
Total Revenue	$	188,354	$	196,148

The following table is a reconciliation of our reported income before income taxes to our net operating income for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Income before income taxes	$	20,639	$	95,974
All Other
Management fees and other revenue	(12,135)		(9,074)
General and administrative expenses	13,145		15,674
Depreciation and amortization	48,116		47,331
Other	4,476		3,492
Interest expense	40,475		38,117
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Acquisition and integration costs	2,445		507
Non-operating income	(360)		(98)
Gain on sale of self storage properties	(1,425)		(61,173)
Net operating income	$	121,115	$	132,380

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ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

We make forward-looking statements in this report that are subject to risks and uncertainties. These forward-looking statements include information about possible or assumed future results of our business, financial condition, liquidity, results of operations, plans and objectives. When we use the words "believe," "expect," "anticipate," "estimate," "plan," "continue," "intend," "should," "may," or similar expressions, we intend to identify forward-looking statements.

The forward-looking statements contained in this report reflect our current views about future events and are subject to numerous known and unknown risks, uncertainties, assumptions, and changes in circumstances that may cause our actual results to differ significantly from those expressed in any forward-looking statement.

Statements regarding the following subjects, among others, may be forward-looking:

•market trends in our industry, interest rates, inflation, tariff policies, the debt and lending markets or the general economy;

•our business and investment strategy;

•the acquisition or disposition of properties, including those under contract, and the ability of our acquisitions to achieve underwritten capitalization rates and our ability to execute on our acquisition pipeline;

•the timing of acquisitions or dispositions;

•the integration of the properties managed by our former participating regional operators ("PROs") into our platforms, including into our financial and operational reporting infrastructure and internal control framework;

•our operating performance and projected operating results, including our ability to achieve market rents and occupancy levels, reduce operating expenditures and increase the sale of ancillary products and services;

•our ability to access additional off-market acquisitions;

•actions and initiatives of the U.S. federal, state and local government and changes to U.S. federal, state and local government policies, regulations, tax laws and rates (and related accounting guidance), and the execution and impact of these actions, initiatives, policies, regulations and laws;

•the state of the U.S. economy generally or in specific geographic regions, states, territories or municipalities;

•economic trends and economic recoveries;

•our ability to obtain and maintain financing arrangements on favorable terms;

•general volatility of the securities markets in which we participate;

•impacts from major public health events, including unfavorable changes to economic conditions that could adversely affect occupancy levels, rental rates, expenses and the ability of our tenants to pay rent;

•changes in the value of our assets;

•projected capital expenditures;

•the impact of technology on our products, operations, and business;

•the implementation of our technology programs (including our ability to effectively implement our integrated Internet marketing strategy or adopt advancements in information technology);

•changes in interest rates, the degree to which our hedging strategies may or may not protect us from interest rate volatility and the impact of such changes on the economy and our industry;

•our ability to continue to qualify and maintain our qualification as a real estate investment trust for U.S. federal income tax purposes ("REIT");

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•availability of qualified personnel;

•the risks of investing through joint ventures, including whether the anticipated benefits from a joint venture are realized or may take longer to realize than expected;

•risks related to or a consequence of natural disasters or acts of violence, major public health events, active shooters, terrorism, insurrection or war that affect the markets in which we operate;

•estimates relating to our ability to make distributions to our shareholders in the future; and

•our understanding of our competition.

The forward-looking statements are based on our beliefs, assumptions and expectations of our future performance, taking into account all information currently available to us. Forward-looking statements are not predictions of future events. These beliefs, assumptions, and expectations can change as a result of many possible events or factors, not all of which are known to us. Readers should carefully review our financial statements and the notes thereto, as well as the sections entitled "Business," "Risk Factors," "Properties," and "Management's Discussion and Analysis of Financial Condition and Results of Operations," described in the Company's Annual Report on Form 10-K for the year ended December 31, 2024, and the other documents we file from time to time with the SEC. If a change occurs, our business, financial condition, liquidity and results of operations may vary materially from those expressed in our forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made. New risks and uncertainties arise over time, and it is not possible for us to predict those events or how they may affect us. In addition, we cannot assess the impact of each factor on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Overview

National Storage Affiliates Trust is a fully integrated, self-administered and self-managed real estate investment trust organized in the state of Maryland on May 16, 2013. We have elected and we believe that we have qualified to be taxed as a REIT commencing with our taxable year ended December 31, 2015. We serve as the sole general partner of our operating partnership, a Delaware limited partnership formed on February 13, 2013 to conduct our business, which is focused on the ownership, operation, and acquisition of self storage properties located predominantly within the top 100 metropolitan statistical areas throughout the United States.

Our vice chairperson of the board of trustees and former chairperson of the board of trustees and chief executive officer, Arlen D. Nordhagen, co-founded SecurCare Self Storage, Inc. in 1988 to invest in and manage self storage properties. While growing SecurCare to over 150 self storage properties, Mr. Nordhagen recognized a market opportunity for a differentiated public self storage REIT that would leverage the benefits of national scale by integrating multiple experienced regional self storage operators with local operational focus and expertise. Although the PRO structure contributed significantly to our growth over the last decade, the internalization of the PRO structure was always a part of our long term vision. Our former structure offered the former PROs a unique opportunity to serve as regional property managers for their managed portfolios and directly participate in the potential upside of those properties while simultaneously diversifying their investment to include a broader portfolio of self storage properties. Over time, largely through our unconsolidated real estate ventures, PRO retirements and the internalization of our PRO structure, effective July 1, 2024, we have developed a full service internally-staffed property management platform.

Our Structure

Through our property management platform, we direct, manage and control the day-to-day operations and affairs of our consolidated properties and our unconsolidated real estate ventures. As of March 31, 2025, our property management platform managed and controlled the majority of our 816 consolidated properties and all 259 of our unconsolidated real estate venture properties. The properties are primarily managed by us under the brands of iStorage, Move It, Moove In, Northwest, RightSpace, SecurCare and Southern.

We earn certain customary fees for managing and operating the properties in the unconsolidated real estate ventures and we facilitate tenant insurance and/or tenant warranty protection programs for tenants at these properties in exchange for half of all proceeds from such programs.

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Our Consolidated Properties

We seek to own properties that are well located in high quality sub-markets with highly accessible street access and attractive supply and demand characteristics, providing our properties with strong and stable cash flows that we believe are less sensitive to the fluctuations of the general economy. Many of these markets have multiple barriers to entry against increased supply, including zoning restrictions against new construction and new construction costs that we believe are higher than our properties' fair market value.

As of March 31, 2025, we owned a geographically diversified portfolio of 816 self storage properties located in 37 states and Puerto Rico, comprising approximately 52.2 million rentable square feet, configured in approximately 410,000 storage units.

Our Unconsolidated Real Estate Ventures

We seek to opportunistically partner with institutional funds and other institutional investors to acquire attractive portfolios utilizing a promoted return structure. We believe there is significant opportunity for continued external growth by partnering with institutional investors seeking to deploy capital in the self storage industry. In addition, we consider the 75% third-party interest in the Company's unconsolidated real estate ventures, which currently own 259 properties, to present a potential acquisition opportunity. This 75% third-party share of gross real estate assets is approximately $2.0 billion based on the historical book value of the joint ventures. Were we to pursue an acquisition of these interests, it could potentially drive our future growth.

2024 Joint Venture

As of March 31, 2025, the 2024 Joint Venture, in which we have a 25% ownership interest, owned and operated 56 self storage properties containing approximately 3.2 million rentable square feet, configured in approximately 24,000 storage units and located across seven states.

2023 Joint Venture

As of March 31, 2025, the 2023 Joint Venture, in which we have a 25% ownership interest, owned and operated 18 self storage properties, all of which were acquired by the 2023 Joint Venture in 2024, containing approximately 1.2 million rentable square feet, configured in approximately 8,000 storage units and located across two states.

2018 Joint Venture

As of March 31, 2025, the 2018 Joint Venture, in which we have a 25% ownership interest, owned and operated 104 self storage properties containing approximately 7.9 million rentable square feet, configured in approximately 65,000 storage units and located across 17 states.

2016 Joint Venture

As of March 31, 2025, the 2016 Joint Venture, in which we have a 25% ownership interest, owned and operated 81 self storage properties containing approximately 5.7 million rentable square feet, configured in approximately 47,000 storage units and located across 13 states.

Results of Operations

When reviewing our results of operations it is important to consider the timing of acquisition and disposition activity and the internalization of our PRO structure. We acquired three self storage properties and disposed of two self storage properties during the three months ended March 31, 2025. During the year ended December 31, 2024, we contributed 56 self storage properties to the 2024 Joint Venture, sold an additional 40 self storage properties and acquired seven self storage properties. As a result of these and other factors, we do not believe that our historical results of operations discussed and analyzed below are comparable or necessarily indicative of our future results of operations or cash flows.

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The following discussion and analysis of the results of our operations and financial condition should be read in conjunction with the accompanying condensed consolidated financial statements in Item 1. Certain figures, such as interest rates and other percentages, included in this section have been rounded for ease of presentation. Percentage figures included in this section have not in all cases been calculated on the basis of such rounded figures but on the basis of such amounts prior to rounding. For this reason, percentage amounts in this section may vary slightly from those obtained by performing the same calculations using the figures in our condensed consolidated financial statements or in the associated text. Certain other amounts that appear in this section may similarly not sum due to rounding.

Three Months Ended March 31, 2025 compared to the Three Months Ended March 31, 2024

The following table illustrates the changes in rental revenue, other property-related revenue, management fees and other revenue, property operating expenses, and other expenses for the three months ended March 31, 2025 compared to the three months ended March 31, 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024		Change
Rental revenue	$	169,475	$	180,382	$	(10,907)
Other property-related revenue	6,744		6,692		52
Management fees and other revenue	12,135		9,074		3,061
Total revenue	188,354		196,148		(7,794)
Property operating expenses	55,104		54,694		410
General and administrative expenses	13,145		15,674		(2,529)
Depreciation and amortization	48,116		47,331		785
Other	4,476		3,492		984
Total operating expenses	120,841		121,191		(350)
Other (expense) income
Interest expense	(40,475)		(38,117)		(2,358)
Equity in (losses) of unconsolidated real estate ventures	(5,739)		(1,630)		(4,109)
Acquisition and integration costs	(2,445)		(507)		(1,938)
Non-operating income	360		98		262
Gain on sale of self storage properties	1,425		61,173		(59,748)
Other (expense) income, net	(46,874)		21,017		(67,891)
Income before income taxes	20,639		95,974		(75,335)
Income tax expense	(1,120)		(886)		(234)
Net income	19,519		95,088		(75,569)
Net income attributable to noncontrolling interests	(6,525)		(36,061)		29,536
Net income attributable to National Storage Affiliates Trust	12,994		59,027		(46,033)
Distributions to preferred shareholders	(5,114)		(5,110)		(4)
Net income attributable to common shareholders	$	7,880	$	53,917	$	(46,037)

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Total Revenue

Our total revenue, including management fees and other revenue, decreased by $7.8 million, or 4.0%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024. This decrease was primarily attributable to the contribution of 56 self storage properties to the 2024 Joint Venture and the sale of 42 self storage properties to unaffiliated third parties between January 1, 2024 and March 31, 2025. The decrease in total revenue was also attributable to a decrease in total portfolio average occupancy from 85.2% for the three months ended March 31, 2024 to 83.4% for the three months ended March 31, 2025. Average occupancy is calculated based on the average of the month-end occupancy immediately preceding the period presented and the month-end occupancies included in the respective period presented.

Rental Revenue

Rental revenue decreased by $10.9 million, or 6.0%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024. The decrease in rental revenue was primarily attributable to the contribution of 56 self storage properties to the 2024 Joint Venture and the sale of 42 self storage properties to unaffiliated third parties between January 1, 2024 and March 31, 2025. Annualized total portfolio rental revenues (including fees and net of any discounts and uncollectible customer amounts) divided by average occupied square feet ("average annualized rental revenue per occupied square foot") decreased from $15.70, for the three months ended March 31, 2024 to $15.58, or 0.8%, for the three months ended March 31, 2025, driven primarily by decreased contractual lease rates for in-place tenants.

Other Property-Related Revenue

Other property-related revenue represents ancillary income from our self storage properties, such as tenant insurance-related access fees and sales of storage supplies. Other property-related revenue increased by $0.1 million, or 0.8%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024.

Management Fees and Other Revenue

Management fees and other revenue, which includes revenue related to managing and operating the unconsolidated real estate ventures and other revenue from our tenant insurance programs, increased $3.1 million, or 33.7%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. This increase was primarily attributable to increased property management fees resulting from the 2023 Joint Venture and the 2024 Joint Venture and an increase in tenant insurance activity upon our acquisition of certain rights related to certain former PROs’ tenant insurance-related programs during the year ended December 31, 2024.

Property Operating Expenses

Property operating expenses increased by $0.4 million, or 0.7%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. The increase in property operating expenses was primarily attributable to increases in marketing, repairs and maintenance, and utilities expense, partially offset by the contribution of 56 self storage properties to the 2024 Joint Venture and the sale of 42 self storage properties to unaffiliated third parties between January 1, 2024 and March 31, 2025.

General and Administrative Expenses

General and administrative expenses decreased by $2.5 million, or 16.1%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. This result was primarily attributable to a decrease in management fees following the internalization of the PRO structure from $5.1 million for the three months ended March 31, 2024 to $1.4 million for the three months ended March 31, 2025.

Depreciation and Amortization

Depreciation and amortization increased $0.8 million, or 1.7%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. This increase was primarily attributable to the incremental depreciation expense related to the 10 self storage properties acquired between January 1, 2024 and March 31, 2025.

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Other

Other expenses increased $1.0 million, or 28.2%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. This increase was primarily attributable to increases in administrative costs relating to our tenant insurance programs, due to an increase in related activity upon our acquisition of certain rights related to certain former PROs’ tenant insurance-related programs during the year ended December 31, 2024.

Interest Expense

Interest expense increased $2.4 million, or 6.2%, for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. The increase in interest expense was primarily attributable to an increase in the amount of debt subject to variable interest rates (excluding variable-rate debt subject to interest rate swaps) outstanding from $138.0 million, as of March 31, 2024, to $425.8 million as of March 31, 2025.

Equity In Losses Of Unconsolidated Real Estate Ventures

Equity in losses of unconsolidated real estate ventures represents our share of earnings and losses incurred through our 25% ownership interests in the 2024 Joint Venture, the 2023 Joint Venture, the 2018 Joint Venture and the 2016 Joint Venture. During the three months ended March 31, 2025, we recorded $5.7 million of equity in losses from our unconsolidated real estate ventures compared to $1.6 million of losses for the three months ended March 31, 2024. The increase was primarily attributable to the non-cash impact of applying the hypothetical liquidation at book value ("HLBV") method to the 2024 Joint Venture, which allocates income (loss) based on the change in each owners' claim on net assets upon a hypothetical liquidation of the underlying joint venture at book value as of March 31, 2025.

Acquisition and Integration Costs

Acquisition and integration costs increased $1.9 million for the three months ended March 31, 2025, compared to the three months ended March 31, 2024. This increase was primarily attributable to costs related to the internalization of the PRO structure.

Gain on Sale of Self Storage Properties

Gain on sale of self storage properties was $1.4 million, for the three months ended March 31, 2025, compared to $61.2 million for the three months ended March 31, 2024. The gain on sale of self storage properties was primarily attributable to the sale of two self storage properties to third parties during the three months ended March 31, 2025, for net proceeds of $9.8 million.

Net Income Attributable to Noncontrolling Interests

Net income attributable to noncontrolling interests was $6.5 million for the three months ended March 31, 2025, compared to $36.1 million for the three months ended March 31, 2024. The decrease was primarily attributable to the decrease in net income driven by larger gains on the sale of self storage properties recognized in the three months ended March 31, 2024.

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Non-GAAP Financial Measures

FFO and Core FFO

Funds from operations, or FFO, is a widely used performance measure for real estate companies and is provided here as a supplemental measure of our operating performance. The December 2018 Nareit Funds From Operations White Paper - 2018 Restatement defines FFO as net income (as determined under GAAP), excluding: real estate depreciation and amortization, gains and losses from the sale of certain real estate assets, gains and losses from change in control, mark-to-market changes in value recognized on equity securities, impairment write-downs of certain real estate assets and impairment of investments in entities when it is directly attributable to decreases in the value of depreciable real estate held by the entity, and after adjusting equity in earnings (losses) to reflect our share of FFO in unconsolidated real estate ventures. Distributions declared on subordinated performance units and DownREIT subordinated performance units represented our allocation of FFO to noncontrolling interests held by subordinated performance unitholders and DownREIT subordinated performance unitholders. For purposes of calculating FFO attributable to common shareholders, OP unitholders, and LTIP unitholders, we exclude distributions declared on preferred shares and preferred units, and, prior to the internalization of the PRO structure, subordinated performance units and DownREIT subordinated performance units. We define Core FFO as FFO, as further adjusted to eliminate the impact of certain items that we do not consider indicative of our core operating performance. These further adjustments consist of acquisition costs, integration costs, executive severance costs, gains on debt forgiveness, gains (losses) on early extinguishment of debt, casualty-related expenses, losses, and related recoveries and adjustments for unconsolidated partnerships and joint ventures.

Management uses FFO and Core FFO as key performance indicators in evaluating the operations of our properties. Given the nature of our business as a real estate owner and operator, we consider FFO and Core FFO as key supplemental measures of our operating performance that are not specifically defined by GAAP. We believe that FFO and Core FFO are useful to management and investors as a starting point in measuring our operational performance because FFO and Core FFO exclude various items included in net income (loss) that do not relate to or are not indicative of our operating performance such as gains (or losses) from sales of self storage properties and depreciation, which can make periodic and peer analyses of operating performance more difficult. Our computation of FFO and Core FFO may not be comparable to FFO reported by other REITs or real estate companies.

FFO and Core FFO should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues, operating income and net income (loss). FFO and Core FFO do not represent cash generated from operating activities determined in accordance with GAAP and are not a measure of liquidity or an indicator of our ability to make cash distributions. We believe that to further understand our performance, FFO and Core FFO should be compared with our reported net income (loss) and considered in addition to cash flows computed in accordance with GAAP, as presented in our condensed consolidated financial statements.

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The following table presents a reconciliation of net income to FFO and Core FFO for the three months ended March 31, 2025 and 2024 (dollars in thousands, except per share and unit amounts):

	Three Months Ended March 31,
	2025		2024
Net income	$	19,519	$	95,088
Add (subtract):
Real estate depreciation and amortization	47,661		46,964
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Company's share of FFO in unconsolidated real estate ventures	5,052		5,685
Gain on sale of self storage properties	(1,425)		(61,173)
Distributions to preferred shareholders and unitholders	(5,568)		(5,568)
FFO attributable to subordinated performance units(1)	—		(10,730)
FFO attributable to common shareholders, OP unitholders, and LTIP unitholders	70,978		71,896
Add:
Acquisition costs	403		507
Integration costs(2)	2,042		—
Core FFO attributable to common shareholders, OP unitholders, and LTIP unitholders	$	73,423	$	72,403
Weighted average shares and units outstanding - FFO and Core FFO:(3)
Weighted average shares outstanding - basic	76,372		80,236
Weighted average restricted common shares outstanding	21		22
Weighted average OP units outstanding	52,147		37,633
Weighted average DownREIT OP unit outstanding	5,769		2,120
Weighted average LTIP units outstanding	925		693
Total weighted average shares and units outstanding - FFO and Core FFO	135,234		120,704
FFO per share and unit	$	0.52	$	0.60
Core FFO per share and unit	$	0.54	$	0.60

(1)	Amounts represent distributions declared for subordinated performance unitholders and DownREIT subordinated performance unitholders for the periods presented.
(2)	Integration costs relate to expenses incurred as a part of the internalization of the PRO structure.
(3)	We combine OP units and DownREIT OP units with common shares because, after the applicable lock-out periods, OP units in our operating partnership are redeemable for cash or, at our option, exchangeable for common shares on a one-for-one basis and DownREIT OP units are also redeemable for cash or, at our option, exchangeable for OP units in our operating partnership on a one-for-one basis, subject to certain adjustments in each case. LTIP units may also, under certain circumstances, be convertible into or exchangeable for common shares (or other units that are convertible into or exchangeable for common shares). All subordinated performance units and DownREIT subordinated performance units were converted into OP units on July 1, 2024, in connection with the internalization of the PRO structure. See Note 1 to the following table for additional discussion of subordinated performance units, DownREIT subordinated performance units, and LTIP units in the calculation of FFO and Core FFO per share and unit.

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The following table presents a reconciliation of earnings per share - diluted to FFO and Core FFO per share and unit for the three months ended March 31, 2025 and 2024:

	Three Months Ended March 31,
	2025		2024
Earnings per share - diluted	$	0.10	$	0.65
Impact of the difference in weighted average number of shares(1)	(0.04)		0.10
Impact of GAAP accounting for noncontrolling interests, two-class method and treasury stock method(2)	0.04		—
Add real estate depreciation and amortization	0.35		0.39
Add equity in losses of unconsolidated real estate ventures	0.04		0.01
Add Company's share of FFO in unconsolidated real estate ventures	0.04		0.05
Subtract gain on sale of self storage properties	(0.01)		(0.51)
FFO attributable to subordinated performance unitholders	—		(0.09)
FFO per share and unit	0.52		0.60
Add acquisition costs	—		—
Add integration costs	0.02		—
Core FFO per share and unit	$	0.54	$	0.60

(1)

Adjustment accounts for the difference between the weighted average number of shares used to calculate diluted earnings per share and the weighted average number of shares used to calculate FFO and Core FFO per share and unit. Diluted earnings per share is calculated using the two-class method for the company's restricted common shares and the treasury stock method for certain unvested LTIP units, and assumes the conversion of vested LTIP units into OP units on a one-for-one basis and the hypothetical conversion of subordinated performance units, and DownREIT subordinated performance units into OP units, even though such units may have only been convertible into OP units (i) after a lock-out period and (ii) upon certain events or conditions. All outstanding subordinated performance units and DownREIT subordinated performance units were converted into OP units on July 1, 2024, in connection with the internalization of the PRO structure. The computation of weighted average shares and units for FFO and Core FFO per share and unit includes all restricted common shares and LTIP units that participate in distributions and excludes all subordinated performance units and DownREIT subordinated performance units because their effect has been accounted for through the allocation of FFO to the related unitholders based on distributions declared.

(2)

Represents the effect of adjusting the numerator to consolidated net income (loss) prior to GAAP allocations for noncontrolling interests, after deducting preferred share and unit distributions, and before the application of the two-class method and treasury stock method, as described in Note 1.

Net Operating Income

Net operating income, or NOI, represents rental revenue plus other property-related revenue less property operating expenses. NOI is not a measure of performance calculated in accordance with GAAP.

We believe NOI is useful to investors in evaluating our operating performance because:

•NOI is one of the primary measures used by our management and our PROs to evaluate the economic productivity of our properties, including our ability to lease our properties, increase pricing and occupancy and control our property operating expenses;

•NOI is widely used in the real estate industry and the self storage industry to measure the performance and value of real estate assets without regard to various items included in net income that do not relate to or are not indicative of operating performance, such as depreciation and amortization, which can vary depending upon accounting methods, the book value of assets, and the impact of our capital structure; and

•We believe NOI helps our investors to meaningfully compare the results of our operating performance from period to period by removing the impact of our capital structure (primarily interest expense on our outstanding indebtedness) and depreciation of the cost basis of our assets from our operating results.

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There are material limitations to using a non-GAAP measure such as NOI, including the difficulty associated with comparing results among more than one company and the inability to analyze certain significant items, including depreciation and interest expense, that directly affect our net income (loss). We compensate for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with our analysis of net income (loss). NOI should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues and net income (loss).

As of March 31, 2025, our same store portfolio consisted of 771 self storage properties. Our same store portfolio is defined as those properties owned and operated since the first day of the earliest year presented, excluding any properties sold, expected to be sold or subject to significant changes such as expansions or casualty events which cause the portfolio's year-over-year operating results to no longer be comparable. The following table illustrates the changes in rental revenue, other property-related revenue, and property operating expenses, for the three months ended March 31, 2025 compared to the three months ended March 31, 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024		Change
Rental revenue
Same store portfolio	$	162,224	$	167,620	$	(5,396)
Non-same store portfolio	7,251		12,762		(5,511)
Total rental revenue	169,475		180,382		(10,907)
Other property-related revenue
Same store portfolio	6,433		6,167		266
Non-same store portfolio	311		525		(214)
Total other property-related revenue	6,744		6,692		52
Property operating expenses
Same store portfolio	52,245		50,402		1,843
Non-same store portfolio	2,859		4,800		(1,941)
Prior period comparability adjustment(1)	—		(508)		508
Total property operating expenses	55,104		54,694		410
Net operating income
Same store portfolio	116,412		123,385		(6,973)
Non-same store portfolio	4,703		8,995		(4,292)
Total net operating income	$	121,115	$	132,380	$	(11,265)

(1) Certain payroll and related costs associated with the former PRO portfolios were not reflected as property-level expenses in 2024 under the management of the former PROs. Such costs are reflected in property operating expenses in 2025 under our management. For purposes of comparable same store reporting, we have included the specific 2024 expense amounts for the same store portfolio in the relevant periods. This line item is presented in order to reconcile total property operating expenses to previously reported figures.

Rental Revenue

Same store portfolio rental revenues decreased $5.4 million, or 3.2%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024. This decrease in same store portfolio rental revenue was driven primarily by a decrease in average occupancy from 85.8% for the three months ended March 31, 2024 to 83.9% for the three months ended March 31, 2025. Average annualized same store rental revenue per occupied square foot decreased from $15.86 to $15.70, or 1.0%, for the three months ended March 31, 2025, driven primarily by decreased lease rates for new tenants.

Other Property-Related Revenue

Same store portfolio other property-related revenue increased $0.3 million, or 4.3%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024.

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Property Operating Expenses

Same store portfolio property operating expenses increased $1.8 million, or 3.7%, for the three months ended March 31, 2025, as compared to the three months ended March 31, 2024. The increase in same store property operating expenses was a result of increases in marketing, repairs and maintenance, and utilities expense, partially offset by decreases in personnel costs during the three months ended March 31, 2025.

The following table presents a reconciliation of net income to NOI for the periods presented (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Net income	$	19,519	$	95,088
(Subtract) Add:
Management fees and other revenue	(12,135)		(9,074)
General and administrative expenses	13,145		15,674
Other	4,476		3,492
Depreciation and amortization	48,116		47,331
Interest expense	40,475		38,117
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Acquisition and integration costs	2,445		507
Income tax expense	1,120		886
Gain on sale of self storage properties	(1,425)		(61,173)
Non-operating income	(360)		(98)
Net Operating Income	$	121,115	$	132,380

Our consolidated NOI shown in the table above does not include our proportionate share of NOI for our unconsolidated real estate ventures. For additional information about the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture see Note 5 to the condensed consolidated financial statements in Item 1.

EBITDA and Adjusted EBITDA

We define EBITDA as net income (loss), as determined under GAAP, plus interest expense, loss on early extinguishment of debt, income taxes, depreciation and amortization expense and the Company's share of unconsolidated real estate venture depreciation and amortization. We define Adjusted EBITDA as EBITDA plus acquisition costs, integration costs, executive severance costs, equity-based compensation expense, losses on sale of properties, impairment of long-lived assets and casualty-related expenses, losses and recoveries, minus gains on sale of properties and debt forgiveness, and after adjustments for unconsolidated partnerships and joint ventures, including the removal of the non-cash effect of applying HLBV for purposes of allocating GAAP net income (loss) for the 2024 Joint Venture. These further adjustments eliminate the impact of items that we do not consider indicative of our core operating performance. In evaluating EBITDA and Adjusted EBITDA, you should be aware that in the future we may incur expenses that are the same as or similar to some of the adjustments in this presentation. Our presentation of EBITDA and Adjusted EBITDA should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items.

We present EBITDA and Adjusted EBITDA because we believe they assist investors and analysts in comparing our performance across reporting periods on a consistent basis by excluding items that we do not believe are indicative of our core operating performance. EBITDA and Adjusted EBITDA have limitations as an analytical tool. Some of these limitations are:

•EBITDA and Adjusted EBITDA do not reflect our cash expenditures, or future requirements, for capital expenditures, contractual commitments or working capital needs;

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•EBITDA and Adjusted EBITDA do not reflect the significant interest expense, or the cash requirements necessary to service interest or principal payments, on our debts;

•although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and EBITDA and Adjusted EBITDA do not reflect any cash requirements for such replacements;

•Adjusted EBITDA excludes equity-based compensation expense, which is and will remain a key element of our overall long-term incentive compensation package, although we exclude it as an expense when evaluating our ongoing operating performance for a particular period;

•EBITDA and Adjusted EBITDA do not reflect the impact of certain cash charges resulting from matters we consider not to be indicative of our ongoing operations; and

•other companies in our industry may calculate EBITDA and Adjusted EBITDA differently than we do, limiting their usefulness as comparative measures.

We compensate for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with our analysis of net income (loss). EBITDA and Adjusted EBITDA should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues and net income (loss).

The following table presents a reconciliation of net income to EBITDA and Adjusted EBITDA for the periods presented (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Net income	$	19,519	$	95,088
Add (subtract):
Depreciation and amortization	48,116		47,331
Company's share of unconsolidated real estate venture depreciation and amortization	5,411		4,552
Interest expense	40,475		38,117
Income tax expense	1,120		886
EBITDA	114,641		185,974
Add (subtract):
Acquisition costs	403		507
Effect of hypothetical liquidation at book value (HLBV) accounting for unconsolidated 2024 Joint Venture(1)	5,381		2,764
Gain on sale of self storage properties	(1,425)		(61,173)
Integration costs, excluding equity-based compensation(2)	930		—
Equity-based compensation expense(3)	3,079		1,855
Adjusted EBITDA	$	123,009	$	129,927

(1)	Reflects the non-cash impact of applying HLBV to the 2024 Joint Venture, which allocates GAAP income (loss) on a hypothetical liquidation of the underlying joint venture at book value as of the reporting date.
(2)	Integration costs relate to expenses incurred as a part of the internalization of the PRO structure.
(3)	Equity-based compensation expense is a non-cash item recorded within general and administrative expenses and acquisition and integration costs in our consolidated statements of operations. For the three months ended March 31, 2025, $1.1 million relates to the internalization of the PRO structure and is included in acquisition and integration costs.

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Liquidity and Capital Resources

Liquidity Overview

Liquidity is the ability to meet present and future financial obligations. Our primary source of liquidity is cash flow from our operations. Additional sources are proceeds from dispositions of self storage properties (including contributions to our joint ventures), equity and debt offerings, debt financings including additional borrowing capacity under the credit facility, and expansion options available under the 2028 Term Loan Facility, the June 2029 Term Loan Facility, and our credit facility.

Our short-term liquidity requirements consist primarily of property operating expenses, property acquisitions, capital expenditures, general and administrative expenses and principal and interest on our outstanding indebtedness. A further short-term liquidity requirement relates to distributions to our common and preferred shareholders and holders of preferred units, OP units, LTIP units and DownREIT OP units. We expect to fund short-term liquidity requirements from our operating cash flow, cash on hand and borrowings under our credit facility.

Our long-term liquidity needs consist primarily of the repayment of debt, property acquisitions, and capital expenditures. We acquire properties through the use of cash, preferred units, and OP units in our operating partnership or DownREIT partnerships. We expect to meet our long-term liquidity requirements with operating cash flow, cash on hand, secured and unsecured indebtedness, and the issuance of equity and debt securities.

The availability of credit and its related effect on the overall economy may affect our liquidity and future financing activities, both through changes in interest rates and access to financing. Our ability to access capital on favorable terms as well as to use cash from operations to continue to meet our liquidity needs, all of which are highly uncertain and cannot be predicted, could be affected by various risks and uncertainties. We believe that, as a publicly-traded REIT, we will have access to multiple sources of capital to fund our long-term liquidity requirements, including the incurrence of additional debt and the issuance of debt and additional equity securities. However, we cannot assure you that this will be the case.

Cash Flows

At March 31, 2025, we had $19.3 million in cash and cash equivalents and $0.9 million of restricted cash, a decrease in cash and cash equivalents of $31.1 million and an increase in restricted cash of $0.6 million from December 31, 2024. Restricted cash primarily consists of escrowed funds deposited with financial institutions for real estate taxes, insurance, and other reserves for capital improvements in accordance with our loan agreements. The following discussion relates to changes in cash due to operating, investing, and financing activities, which are presented in our condensed consolidated statements of cash flows included in Item 1 of this report.

Operating Activities

Cash provided by our operating activities was $85.6 million for the three months ended March 31, 2025 compared to $94.0 million the three months ended March 31, 2024. Our operating cash flow decreased primarily due to a decrease in rental revenue primarily driven by the contribution of 56 self storage properties to the 2024 Joint Venture and the sale of 42 self storage properties to unaffiliated third parties between January 1, 2024 and March 31, 2025.

Investing Activities

Cash used in investing activities was $9.7 million for the three months ended March 31, 2025 compared to $567.4 million of cash provided by investing activities for the three months ended March 31, 2024. The primary uses of cash for the three months ended March 31, 2025 was for our acquisition of three self storage properties and an annex and expenditures for corporate furniture and equipment, partially offset by the sale of two self storage properties to third parties.

Capital expenditures totaled $5.7 million and $5.4 million during the three months ended March 31, 2025 and 2024, respectively. We generally fund post-acquisition capital additions from cash provided by operating activities.

We categorize our capital expenditures broadly into three primary categories:

•recurring capital expenditures, which represent the portion of capital expenditures that are deemed to replace the consumed portion of acquired capital assets and extend their useful life;

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•value enhancing capital expenditures, which represent the portion of capital expenditures that are made to enhance the revenue and value of an asset from its original purchase condition; and

•acquisitions capital expenditures, which represent the portion of capital expenditures capitalized during the current period that were identified and underwritten prior to a property's acquisition.

A summary of the capital expenditures for these categories, along with a reconciliation of the total for these categories to the capital expenditures reported in the accompanying condensed consolidated statements of cash flows for the three months ended March 31, 2025 and 2024, are presented below (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Recurring capital expenditures	$	5,272	$	2,771
Value enhancing capital expenditures	—		1,825
Acquisitions capital expenditures	199		903
Total capital expenditures	5,471		5,499
Change in accrued capital spending	260		(125)
Capital expenditures per statement of cash flows	$	5,731	$	5,374

Financing Activities

Cash used in our financing activities was $106.5 million for the three months ended March 31, 2025 compared to $660.0 million of cash used in financing activities for the three months ended March 31, 2024. Our primary uses of financing cash flows for the three months ended March 31, 2025 were for principal payments on existing debt of $157.0 million (which included $156.5 million of principal repayments under the Revolver and $0.5 million of scheduled fixed rate mortgage principal amortization payments), distributions to common shareholders of $43.6 million, distributions to noncontrolling interests of $33.7 million and distributions to preferred shareholders of $5.1 million. Our sources of financing cash flows for the three months ended March 31, 2025 primarily consisted of $134.0 million of borrowings under our Revolver.

Credit Facility and Term Loan Facilities

As of March 31, 2025, our credit facility provided for total borrowings of $1.355 billion, consisting of the following components: (i) a Revolver which provides for a total borrowing commitment up to $950.0 million, whereby we may borrow, repay and re-borrow amounts under the Revolver, (ii) a $275.0 million Term Loan D and (iii) a $130.0 million Term Loan E. The Revolver is set to mature in January 2027; provided that we may elect up to two times to extend the maturity by six months each up to January 2028 by paying an extension fee for each such election of 0.0625% of the total borrowing commitment thereunder at the time of extension and meeting other customary conditions with respect to compliance. The Term Loan D matures in July 2026 and the Term Loan E matures in March 2027. The Revolver, Term Loan D and Term Loan E are not subject to any scheduled reduction or amortization payments prior to maturity. As of March 31, 2025, we had an expansion option under the credit facility, which, if exercised in full, would provide for a total borrowing capacity of $1.900 billion.

As of March 31, 2025, $275.0 million was outstanding under the Term Loan D with an effective interest rate of 3.96% and $130.0 million was outstanding under the Term Loan E with an effective interest rate of 4.89%. As of March 31, 2025, we would have had the capacity to borrow remaining Revolver commitments of $522.5 million while remaining in compliance with the credit facility's financial covenants.

We have a 2028 Term Loan Facility that matures in December 2028 and is separate from the credit facility in an aggregate amount of $75.0 million. As of March 31, 2025 the entire amount was outstanding under the 2028 Term Loan Facility with an effective interest rate of 4.62%. We have an expansion option under the 2028 Term Loan Facility, which, if exercised in full, would provide for total borrowings in an aggregate amount up to $125.0 million.

We have an April 2029 Term Loan Facility that matures in April 2029 and is separate from the credit facility and 2028 Term Loan Facility in an aggregate amount of $100.0 million. As of March 31, 2025 the entire amount was outstanding under the April 2029 Term Loan Facility with an effective interest rate of 4.27%.

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We have a June 2029 Term Loan Facility that matures in June 2029 and is separate from the credit facility, 2028 Term Loan Facility, and April 2029 Term Loan Facility in an aggregate amount of $285.0 million. As of March 31, 2025, the June 2029 Term Loan Facility had an effective interest rate of 5.37%. We have an expansion option under the June 2029 Term Loan Facility, which, if exercised in full, would provide for total borrowings in an aggregate amount up to $300.0 million.

2029 and August 2031 Senior Unsecured Notes

On August 30, 2019, our operating partnership issued $100.0 million of 3.98% senior unsecured notes due August 30, 2029 and $50.0 million of 4.08% senior unsecured notes due August 30, 2031 in a private placement to certain institutional investors.

August 2030 and August 2032 Senior Unsecured Notes

On October 22, 2020, our operating partnership issued $150.0 million of 2.99% senior unsecured notes due August 5, 2030 and $100.0 million of 3.09% senior unsecured notes due August 5, 2032 in a private placement to certain institutional investors.

May 2026, May 2031 and May 2033 Senior Unsecured Notes

On May 26, 2021, our operating partnership issued $55.0 million of 3.10% senior unsecured notes due May 4, 2033. On July 26, 2021, our operating partnership issued $35.0 million of 2.16% senior unsecured notes due May 4, 2026 and $90.0 million of 3.00% senior unsecured notes due May 4, 2031.

November 2030, November 2031, November 2033 and 2036 Senior Unsecured Notes

On December 14, 2021, our operating partnership issued $75.0 million of 2.72% senior unsecured notes due November 30, 2030, $175.0 million of 2.81% senior unsecured notes due November 30, 2031 and $75.0 million of 3.06% senior unsecured notes due November 30, 2036. On January 28, 2022, our operating partnership issued $125.0 million of 2.96% senior unsecured notes due November 30, 2033.

November 2032 Senior Unsecured Notes

On September 28, 2022, our operating partnership issued $200.0 million of 5.06% senior unsecured notes due November 16, 2032.

July 2028 Senior Unsecured Notes

On April 27, 2023, our operating partnership issued $120.0 million of 5.61% senior unsecured notes due July 5, 2028 in a private placement to certain institutional investors. The July 2028 Notes have an effective interest rate of 5.75% after taking into account the effect of interest rate swaps.

October 2026, October 2028, October 2030 and October 2033 Senior Unsecured Notes

On October 5, 2023, our operating partnership issued $65.0 million of 6.46% senior unsecured notes due October 5, 2026, $100.0 million of 6.55% senior unsecured notes due October 5, 2028, $35.0 million of 6.66% senior unsecured notes due October 5, 2030 and $50.0 million of 6.73% senior unsecured notes due October 5, 2033 in a private placement to certain institutional investors.

September 2028, September 2031 and 2034 Senior Unsecured Notes

On September 5, 2024, our operating partnership issued $75.0 million of 5.40% senior unsecured notes due September 5, 2028, $125.0 million of 5.55% senior unsecured notes due September 5, 2031, and $150.0 million of 5.74% senior unsecured notes due September 5, 2034 in a private placement to certain institutional investors.

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Debt, Issuer and Preferred Shares Ratings

On March 17, 2025, Kroll Bond Rating Agency, LLC ("KBRA") downgraded the operating partnership's issuer and senior notes credit ratings to BBB from BBB+ and revised the outlook to stable from negative. KBRA also downgraded the credit ratings for the Company's Series A Preferred Shares and Series B Preferred Shares to BBB- from BBB.

Equity Transactions

Issuance of Common Shares

During the three months ended March 31, 2025, after receiving notices of redemption from certain OP unitholders, we elected to issue 93,661 common shares to such holders in exchange for 93,661 OP units in satisfaction of the operating partnership's redemption obligations.

Issuance and Redemption of OP Equity

During the three months ended March 31, 2025, we issued 50,533 OP units upon the conversion of an equivalent number of LTIP units and redeemed 2,387 Series A-1 preferred units for an equivalent number of Series A Preferred Shares.

Dividends and Distributions

During the three months ended March 31, 2025, the Company paid $43.6 million of distributions to common shareholders, $5.1 million of distributions to preferred shareholders and distributed $33.7 million to noncontrolling interests.

On February 13, 2025, our board of trustees declared a cash dividend and distribution, respectively, of $0.57 per common share and OP unit to shareholders and OP unitholders of record as of March 14, 2025. On February 13, 2025, our board of trustees also declared cash distributions of $0.375 per Series A Preferred Share, Series B Preferred Share and Series A-1 preferred unit to shareholders and unitholders of record as of March 14, 2025.

Off-Balance Sheet Arrangements

Except as disclosed in the notes to our financial statements, as of March 31, 2025, we did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purposes entities, which typically are established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Further, except as disclosed in the notes to our financial statements, as of March 31, 2025, we have not guaranteed any obligations of unconsolidated entities, nor made any commitments to provide funding to any such entities, that creates any material exposure to any financing, liquidity, market or credit risk.

Seasonality

The self storage business is subject to minor seasonal fluctuations. A greater portion of revenues and profits are generally realized from May through September. Historically, our highest level of occupancy has typically been in July, while our lowest level of occupancy has typically been in February. Results for any quarter may not be indicative of the results that may be achieved for the full fiscal year.

ITEM 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk refers to the risk of loss from adverse changes in market prices and interest rates. Our future income, cash flows, and fair values of financial instruments are dependent upon prevailing market interest rates. The primary market risk to which we believe we are exposed is interest rate risk. Interest rate risk is highly sensitive to many factors, including governmental monetary and tax policies, domestic and international economic and political considerations, and other factors beyond our control. We use interest rate swaps to moderate our exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. We make limited use of other derivative financial instruments and we do not use them for trading or other speculative purposes.

As of March 31, 2025, we had $425.8 million of debt subject to variable interest rates (excluding variable-rate debt subject to interest rate swaps). If our reference rates (SOFR) were to increase or decrease by 100 basis points, the increase or decrease in interest expense on the variable-rate debt (excluding variable-rate debt subject to interest rate swaps) would decrease or increase future earnings and cash flows by approximately $4.3 million annually.

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Interest rate risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.

ITEM 4. Controls and Procedures

Disclosure Controls and Procedures

The Company's management, with the participation of the Company's chief executive officer and chief financial officer, has evaluated the effectiveness of the Company's disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based on that evaluation, the chief executive officer and chief financial officer concluded that the Company's disclosure controls and procedures, as of the end of the period covered by this report, are effective.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the three months ended March 31, 2025 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute assurance that it will detect or uncover failures within the Company to disclose material information otherwise required to be set forth in our periodic reports.

PART II. OTHER INFORMATION

ITEM 1. Legal Proceedings

We are not currently subject to any legal proceedings that we consider to be material.

ITEM 1A. Risk Factors

For a discussion of our potential risks and uncertainties, see the Company's Annual Report on Form 10-K for the year ended December 31, 2024 (the "2024 Form 10-K") filed with the SEC under the heading Item 1A. "Risk Factors" beginning on page 12, which is accessible on the SEC's website at www.sec.gov.

With the exception of the risk factor set forth below, which updates and supplements the risk factors disclosed in our 2024 Form 10-K, there have been no material changes to the risk factors disclosed in our 2024 Form 10-K.

Recent tariff actions by the U.S and other countries may have an adverse effect on our business, financial condition and results of operations.

The current U.S. administration has recently implemented tariffs on imports from a broad set of countries, including Canada, Mexico, European Union member states, Japan and China creating significant uncertainty about the future relationship between the United States and other countries with respect to these tariffs. In response to these tariffs, global trading partners have or are likely to impose their own tariffs. These developments, or the perception that any of them could occur, have resulted in significant financial market volatility and may continue to have a material adverse effect on global economic conditions and the stability of global financial markets, and may significantly reduce global trade and, in particular, trade between the impacted nations and the United States. Further effects of these tariffs cannot be predicted with certainty. Continued uncertainty surrounding trade policies and the potential for further tariff increases or the imposition of new tariffs may lead to a continuation or worsening of the impact of the tariffs on the financial markets. These trade actions and the widespread uncertainty and international tensions resulting therefrom may have a material adverse effect on our business, results of operations, ability to access capital, and financial condition and on the market price of our common stock.

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ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds

Unregistered Sales of Equity Securities

During the three months ended March 31, 2025, the Company, in its capacity as general partner of its operating partnership, caused the operating partnership to issue 93,661 common shares to satisfy redemption requests from certain limited partners.

Following a specified lock up period after the date of issuance, the OP units issued by the operating partnership may be redeemed from time to time by holders for a cash amount per OP unit equal to the market value of an equivalent number of common shares. The Company has the right, but not the obligation, to assume and satisfy the redemption obligation of the operating partnership described above by issuing one common share in exchange for each OP unit tendered for redemption.

The Company may elect to report early the private placement of its common shares that may occur if the Company elects to assume the redemption obligation of the operating partnership as described above in the event that OP units are in the future tendered for redemption.

As of May 2, 2025, other than those OP units held by the Company, after reflecting the transactions described herein, 58,760,410 OP units were outstanding (including 899,579 outstanding LTIP units in the operating partnership and 5,769,214 outstanding DownREIT OP units, which are convertible into, or exchangeable for, OP units on a one-for-one basis, subject to certain conditions).

These issuances were exempt from registration under Section 4(a)(2) of the Securities Act of 1933, as amended

Issuer Purchases of Equity Securities

On July 11, 2022, the Company approved a share repurchase program authorizing the repurchase of up to $400.0 million of the Company's common shares, under which $256,892 of common shares remain available for repurchase. On December 1, 2023, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $275.0 million of the Company's common shares, under which no common shares remain available for repurchase. On November 14, 2024, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $350.0 million of the Company's common shares. During the three months ended March 31, 2025, certain of our employees surrendered common shares owned by them to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted shares issued to them. The table below summarizes all of our repurchases of common shares during the three months ended March 31, 2025:

Period	Total number of shares purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet be Purchased under the Plans or Programs
January 1 - January 31, 2025	—	$	—	—	$	350,256,892
February 1 - February 28, 2025	—	—		—	350,256,892
March 1 - March 31, 2025(1)	2,391	38.62		—	350,256,892
Total/Weighted Average	2,391	$	38.62	—	$	350,256,892

(1) The number of shares purchased represents restricted common shares surrendered by certain of our employees to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted common shares issued to them. The price paid per share is based on the closing price of our common shares on February 28, 2025 which is the date prior to the date of withholding.

Use of Proceeds

Not applicable.

ITEM 3. Defaults Upon Senior Securities

Not applicable.

ITEM 4. Mine Safety Disclosures

Not applicable.

44

ITEM 5. Other Information

Not applicable.

ITEM 6. Exhibits
The following exhibits are filed with this report:
Exhibit Number	Exhibit Description
3.1	Articles of Amendment and Restatement of National Storage Affiliates Trust (Exhibit 3.1 to the Quarterly Report on Form 10-Q, filed with the SEC on June 5, 2015, is incorporated herein by this reference)
3.2	Third Amended and Restated Bylaws of National Storage Affiliates Trust (Exhibit 3.1 to the Current Report on Form 8-K, filed with the SEC on November 9, 2023, is incorporated herein by this reference)
3.3	Articles Supplementary designating the Series A Preferred Shares of National Storage Affiliates Trust (Exhibit 3.3 to the Form 8-A, filed with the SEC on October 10, 2017, is incorporated herein by this reference)
3.4	Articles Supplementary designating the Series A Preferred Shares of National Storage Affiliates Trust (Exhibit 3.4 to the Form S-3ASR, filed with the SEC on March 14, 2018, is incorporated herein by this reference)
3.5	Articles Supplementary and Certificate of Correction to Articles Supplementary designating the Series A Preferred Shares of National Storage Affiliates Trust (Exhibit 3.5 to the Quarterly Report on Form 10-Q, filed with the SEC on May 3, 2019, is incorporated herein by this reference)
3.6	Articles Supplementary designating the Series A Preferred Shares of National Storage Affiliates Trust (Exhibit 3.1 to the Current Report on Form 8-K filed with the SEC on May 19, 2021, is incorporated herein by this reference)
3.7	Articles Supplementary designating the Series B Preferred Shares of National Storage Affiliates Trust (Exhibit 3.1 to the Current Report on Form 8-K filed with the SEC on March 21, 2023, is incorporated herein by this reference)
4.1	Specimen Common Share Certificate of National Storage Affiliates Trust (Exhibit 4.1 to the Registration Statement on Form S-11/A filed with the SEC on April 20, 2015, is incorporated herein by reference)
4.2	Form of Specimen Certificate of Series A Preferred Shares of National Storage Affiliates Trust (Exhibit 4.1 to the Registration Statement on Form 8-A filed with the SEC on October 10, 2017, is incorporated herein by this reference)
4.3	Description of Common Shares of Beneficial Interest, 6.000% Series A Cumulative Redeemable Preferred Shares of Beneficial Interest and 6.000% Series B Cumulative Redeemable Preferred Shares of Beneficial Interest (Exhibit 4.3 to the Annual Report on Form 10-K, filed with the SEC on February 28, 2024, is incorporated herein by this reference)
31.1*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1**	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH*	Inline XBRL Taxonomy Extension Schema
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase
104*	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)

45

*	Filed herewith.
**	Furnished herewith.

46

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	National Storage Affiliates Trust
By:	/s/ DAVID G. CRAMER
	David G. Cramer
	president and chief executive officer
	(principal executive officer)
By:	/s/ BRANDON S. TOGASHI
	Brandon S. Togashi
	executive vice president and chief financial officer
	(principal financial officer)

Date: May 6, 2025

47

EX-31.1

Exhibit 31.1

Chief Executive Officer Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, David G. Cramer, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of National Storage Affiliates Trust;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and    

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of trustees (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 6, 2025

By:	/s/ David G. Cramer
	David G. Cramer
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Chief Financial Officer Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Brandon S. Togashi, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of National Storage Affiliates Trust;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and    

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of trustees (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 6, 2025

By:	/s/ Brandon S. Togashi
	Brandon S. Togashi
	Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification, Chief Executive Officer and Chief Financial Officer Pursuant To

18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of National Storage Affiliates Trust (the “Company”) on Form 10-Q for the period ended March 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David G. Cramer, President and Chief Executive Officer of the Company, and I, Brandon S. Togashi, Executive Vice President and Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 6, 2025

By:	/s/ David G. Cramer
	David G. Cramer
	President and Chief Executive Officer

By:	/s/ Brandon S. Togashi
	Brandon S. Togashi
	Executive Vice President and Chief Financial Officer

Pursuant to the Securities and Exchange Commission Release 33-8238, dated June 5, 2003, this certification is being furnished and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or incorporated by reference in any registration statement of the Company filed under the Securities Act of 1933, as amended.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

COVER PAGE - shares	3 Months Ended
	Mar. 31, 2025	May 02, 2025
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
Document Transition Report	false
Entity File Number	001-37351
Entity Registrant Name	National Storage Affiliates Trust
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	46-5053858
Entity Address, Address Line One	8400 East Prentice Avenue, 9th Floor
Entity Address, City or Town	Greenwood Village
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80111
City Area Code	720
Local Phone Number	630-2600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		76,489,210
Entity Central Index Key	0001618563
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Shares of Beneficial Interest, $0.01 par value per share
Entity Information [Line Items]
Title of 12(b) Security	Common Shares of Beneficial Interest, $0.01 par value per share
Trading Symbol	NSA
Security Exchange Name	NYSE
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share
Entity Information [Line Items]
Title of 12(b) Security	Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share
Trading Symbol	NSA Pr A
Security Exchange Name	NYSE
Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share
Entity Information [Line Items]
Title of 12(b) Security	Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share
Trading Symbol	NSA Pr B
Security Exchange Name	NYSE

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Real estate
Self storage properties	$ 5,873,499	$ 5,864,134
Less accumulated depreciation	(1,095,918)	(1,051,638)
Self storage properties, net	4,777,581	4,812,496
Cash and cash equivalents	19,266	50,408
Restricted cash	909	345
Debt issuance costs, net	4,921	5,632
Investment in unconsolidated real estate ventures	235,591	246,193
Other assets, net	196,079	218,482
Operating lease right-of-use assets	20,657	20,906
Total assets	5,255,004	5,354,462
Liabilities
Debt financing	3,426,666	3,449,087
Accounts payable and accrued liabilities	92,016	98,657
Interest rate swap liabilities	1,196	471
Operating lease liabilities	22,662	22,888
Deferred revenue	20,272	20,012
Total liabilities	3,562,812	3,591,115
Commitments and contingencies (Note 11)
Equity
Preferred shares of beneficial interest, par value $0.01 per share. 50,000,000 authorized, 14,697,845 and 14,695,458 issued (in series) and outstanding at March 31, 2025 and December 31, 2024, respectively, at liquidation preference	340,955	340,895
Common shares of beneficial interest, par value $0.01 per share. 250,000,000 authorized, 76,450,466 and 76,344,661 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	764	763
Additional paid-in capital	1,249,291	1,249,426
Distributions in excess of earnings	(566,346)	(530,652)
Accumulated other comprehensive income	9,315	15,548
Total shareholders' equity	1,033,979	1,075,980
Noncontrolling interests	658,213	687,367
Total equity	1,692,192	1,763,347
Total liabilities and equity	$ 5,255,004	$ 5,354,462

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Preferred units stated value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares of beneficial interest, authorized (in shares)	50,000,000	50,000,000
Preferred shares of beneficial interest, outstanding (in shares)	14,697,845	14,695,458
Preferred shares of beneficial interest, issued (in shares)	14,697,845	14,695,458
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, authorized (in shares)	250,000,000	250,000,000
Common shares of beneficial interest, outstanding (in shares)	76,450,466	76,344,661
Common shares of beneficial interest, issued (in shares)	76,450,466	76,344,661

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
REVENUE
Rental revenue		$ 180,382
Total revenue	$ 188,354	196,148
OPERATING EXPENSES
Property operating expenses	55,104	54,694
General and administrative expenses	13,145	15,674
Depreciation and amortization	48,116	47,331
Other	4,476	3,492
Total operating expenses	120,841	121,191
OTHER (EXPENSE) INCOME
Interest expense	(40,475)	(38,117)
Equity in (losses) of unconsolidated real estate ventures	(5,739)	(1,630)
Acquisition and integration costs	(2,445)	(507)
Non-operating income	360	98
Gain on sale of self storage properties	1,425	61,173
Other (expense) income, net	(46,874)	21,017
Income before income taxes	20,639	95,974
Income tax expense	(1,120)	(886)
Net income	19,519	95,088
Net income attributable to noncontrolling interests	(6,525)	(36,061)
Net income attributable to National Storage Affiliates Trust	12,994	59,027
Distributions to preferred shareholders	(5,114)	(5,110)
Net income attributable to common shareholders	$ 7,880	$ 53,917
EARNINGS PER SHARE
Earnings per share - basic (in dollars per share)	$ 0.10	$ 0.67
Earnings per share - diluted (in dollars per share)	$ 0.10	$ 0.65
Weighted average shares outstanding - basic (in shares)	76,372	80,236
Weighted average shares outstanding - diluted (in shares)	76,372	138,148
Dividends declared per common share (in dollars per share)	$ 0.57	$ 0.56
Other property-related revenue
REVENUE
Revenue		$ 6,692

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 19,519	$ 95,088
Other comprehensive income (loss)
Unrealized (loss) gain on derivative contracts	(7,799)	20,413
Reclassification of other comprehensive income to interest expense	(3,232)	(9,314)
Other comprehensive (loss) income	(11,031)	11,099
Comprehensive income	8,488	106,187
Comprehensive income attributable to noncontrolling interests	(1,725)	(39,781)
Comprehensive income attributable to National Storage Affiliates Trust	$ 6,763	$ 66,406

XML

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Additional Paid-in Capital	Distributions In Excess Of Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning balances, preferred stock (in shares) at Dec. 31, 2023		14,685,716
Beginning balances at Dec. 31, 2023	$ 2,125,841	$ 340,651	$ 823	$ 1,509,563	$ (449,907)	$ 21,058	$ 703,653
Beginning balances, common stock (in shares) at Dec. 31, 2023			82,285,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemptions of OP units (in shares)			72,802
Redemptions of OP units	(381)		$ 1	1,025		19	(1,426)
Repurchase of common shares (in shares)			(5,491,925)
Repurchase of common shares	(203,573)		$ (55)	(203,518)
Effect of changes in ownership for consolidated entities	0			40,676		(620)	(40,056)
Equity-based compensation expense	1,855			109			1,746
Issuance of restricted common shares (in shares)			8,886
Vesting and forfeitures of restricted common shares, net (in shares)			(2,658)
Vesting and forfeitures of restricted common shares, net	(88)			(88)
Equity offering costs	(255)			(255)
Preferred share dividends	(5,110)				(5,110)
Common share dividends	(43,751)				(43,751)
Distributions to noncontrolling interests	(33,653)						(33,653)
Other comprehensive (loss) income	11,099					7,379	3,720
Net income	95,088				59,027		36,061
Ending balances, preferred stock (in shares) at Mar. 31, 2024		14,685,716
Ending balances at Mar. 31, 2024	$ 1,947,072	$ 340,651	$ 769	1,347,512	(439,741)	27,836	670,045
Ending balances, common stock (in shares) at Mar. 31, 2024			76,873,100
Beginning balances, preferred stock (in shares) at Dec. 31, 2024	14,695,458	14,695,458
Beginning balances at Dec. 31, 2024	$ 1,763,347	$ 340,895	$ 763	1,249,426	(530,652)	15,548	687,367
Beginning balances, common stock (in shares) at Dec. 31, 2024	76,344,661		76,344,661
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares upon redemption of preferred units (in shares)		2,387
Issuance of preferred shares upon redemption of preferred units	$ 0	$ 60		(1)			(59)
Redemptions of OP units (in shares)			93,661
Redemptions of OP units	0		$ 1	1,059		18	(1,078)
Effect of changes in ownership for consolidated entities	0			(1,123)		(20)	1,143
Equity-based compensation expense	3,079			111			2,968
Issuance of restricted common shares (in shares)			15,280
Vesting and forfeitures of restricted common shares, net (in shares)			(3,136)
Vesting and forfeitures of restricted common shares, net	(90)			(90)
Equity offering costs	(91)			(91)
Preferred share dividends	(5,114)				(5,114)
Common share dividends	(43,574)				(43,574)
Distributions to noncontrolling interests	(33,853)						(33,853)
Other comprehensive (loss) income	(11,031)					(6,231)	(4,800)
Net income	$ 19,519				12,994		6,525
Ending balances, preferred stock (in shares) at Mar. 31, 2025	14,697,845	14,697,845
Ending balances at Mar. 31, 2025	$ 1,692,192	$ 340,955	$ 764	$ 1,249,291	$ (566,346)	$ 9,315	$ 658,213
Ending balances, common stock (in shares) at Mar. 31, 2025	76,450,466		76,450,466

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
OPERATING ACTIVITIES
Net income	$ 19,519	$ 95,088
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,116	47,331
Amortization of debt issuance costs	1,475	1,709
Amortization of debt premium	(116)	(255)
Gain on sale of self storage properties	(1,425)	(61,173)
Equity-based compensation expense	3,079	1,855
Equity in losses of unconsolidated real estate ventures	5,739	1,630
Distributions from unconsolidated real estate ventures	4,863	5,479
Change in assets and liabilities, net of effects of self storage property acquisitions:
Other assets	9,627	13,010
Accounts payable and accrued liabilities	(5,467)	(5,681)
Deferred revenue	216	(4,992)
Net Cash Provided by Operating Activities	85,626	94,001
INVESTING ACTIVITIES
Acquisition of self storage properties	(12,434)	0
Capital expenditures	(5,731)	(5,374)
Deposits and advances for self storage properties and other acquisitions	(171)	0
Expenditures for corporate furniture, equipment and other	(89)	(230)
Investment in unconsolidated real estate ventures	0	(35,774)
Net proceeds from sale of self storage properties	8,752	608,777
Net Cash (Used In) Provided by Investing Activities	(9,673)	567,399
FINANCING ACTIVITIES
Borrowings under debt financings	134,000	240,000
Redemption of OP units	0	(381)
Repurchase of common shares	0	(203,528)
Principal payments under debt financings	(157,033)	(613,401)
Payment of dividends to common shareholders	(43,574)	(43,751)
Payment of dividends to preferred shareholders	(5,114)	(5,110)
Distributions to noncontrolling interests	(33,709)	(33,809)
Debt issuance costs	(528)	0
Equity offering costs	(573)	(33)
Net Cash Used In Financing Activities	(106,531)	(660,013)
(Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(30,578)	1,387
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	50,753	87,693
End of period	20,175	89,080
Supplemental Cash Flow Information
Cash paid for interest	37,268	33,605
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Other net liabilities assumed	60	0
Change in accrued capital spending	$ 260	$ (125)

XML

ORGANIZATION AND NATURE OF OPERATIONS

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND NATURE OF OPERATIONS

ORGANIZATION AND NATURE OF OPERATIONS

National Storage Affiliates Trust was organized in the state of Maryland on May 16, 2013 and is a fully integrated, self-administered and self-managed real estate investment trust focused on the self storage sector. As used herein, "NSA," the "Company," "we," "our," and "us" refers to National Storage Affiliates Trust and its consolidated subsidiaries, except where the context indicates otherwise. The Company has elected and believes that it has qualified to be taxed as a real estate investment trust for U.S. federal income tax purposes ("REIT") commencing with its taxable year ended December 31, 2015.

Through its controlling interest as the sole general partner of NSA OP, LP (its "operating partnership"), a Delaware limited partnership formed on February 13, 2013, the Company is focused on the ownership, operation, and acquisition of self storage properties predominantly located within the top 100 metropolitan statistical areas throughout the United States. Pursuant to the operating partnership's Fourth Amended and Restated Agreement of Limited Partnership (the "LP Agreement"), the operating partnership is authorized to issue preferred units, Class A Units ("OP units") and Long-Term Incentive Plan Units ("LTIP units"). The Company also owns certain of its self storage properties through other consolidated subsidiaries of its operating partnership, which the Company refers to as "DownREIT partnerships." The DownREIT partnerships issue equity ownership interests that are intended to be economically equivalent to the Company's OP units ("DownREIT OP units").

The Company owned 816 consolidated self storage properties in 37 states and Puerto Rico with approximately 52.2 million rentable square feet in approximately 410,000 storage units as of March 31, 2025. These properties are managed with local operational focus and expertise.

As of March 31, 2025, the Company also managed through its property management platform an additional portfolio of 259 properties owned by the Company's unconsolidated real estate ventures. These properties contain approximately 18.0 million rentable square feet, configured in approximately 143,000 storage units and located across 24 states. The Company owns a 25% equity interest in each of its unconsolidated real estate ventures.

As of March 31, 2025, the Company operated and held ownership interests in 1,075 self storage properties located across 41 states and Puerto Rico with approximately 70.2 million rentable square feet in approximately 553,000 storage units.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2025

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly and year to date periods are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of the Company is its investment in its operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

As of March 31, 2025, the Company's operating partnership was the primary beneficiary of, and therefore consolidated, 22 partnerships that are considered VIEs, which owned 49 self storage properties. The net book value of the real estate owned by these VIEs was $404.2 million and $407.1 million as of March 31, 2025 and December 31, 2024, respectively. For certain DownREIT partnerships which are subject to fixed rate mortgages payable, the carrying value of such fixed rate mortgages payable held by these VIEs was $172.9 million and $172.9 million as of March 31, 2025 and December 31, 2024, respectively. The creditors of the consolidated VIEs do not have recourse to the Company's general credit.

Revenue Recognition

Rental revenue

Rental revenue consists of space rentals and related fees. Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term.

Other property-related revenue

Other property-related revenue primarily consists of ancillary revenues such as tenant insurance and/or tenant warranty protection-related access fees, sales of storage supplies and truck rentals which are recognized in the period earned.

The Company has tenant insurance and/or tenant warranty protection plan-related arrangements with insurance companies and the Company’s tenants. During the three months ended March 31, 2025 and 2024, the Company recognized $5.9 million and $5.6 million, respectively, of tenant insurance and tenant warranty protection plan revenues.

The Company sells boxes, packing supplies, locks, other retail merchandise and rents moving trucks at its properties. During the three months ended March 31, 2025 and 2024, the Company recognized retail sales of $0.4 million and $0.5 million, respectively.

Management fees and other revenue

Management fees and other revenue consist of property management fees, platform fees, call center fees, acquisition fees, amounts related to the facilitation of tenant warranty protection or tenant insurance programs for certain stores in the Company's consolidated portfolio and unconsolidated real estate ventures, access fees associated with tenant insurance-related arrangements, and profit distributions from the Company's interest in a reinsurance company.

With respect to the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture (each as defined in Note 5), the Company provides supervisory and administrative property management services, centralized call center services, and technology platform and revenue management services to the properties in the unconsolidated real estate ventures. The property management fees for the 2016 Joint Venture, the 2018 Joint Venture and the 2023 Joint Venture are equal to 6% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate ventures, and the platform fees are equal to $1,250 per month per unconsolidated real estate venture property. The property management fees for the 2024 Joint Venture are equal to 4% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate venture. With respect to the 2016 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, the call center fee is equal to 1% of each of monthly gross revenues and net sales revenues. During the three months ended March 31, 2025 and 2024, the Company recognized property management fees, call center fees and platform fees of $4.7 million and $4.3 million, respectively.

The Company also earns acquisition fees for properties acquired by the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture. These fees are based on a percentage of the gross capitalization of the acquired assets determined by the members of the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, and are generally earned when the unconsolidated real estate ventures obtain title and control of an acquired property. During the three months ended March 31, 2025 and 2024, the Company recognized no acquisition fees.

The Company provides or makes available tenant insurance or tenant warranty protection programs for tenants at its properties. For certain of the properties in the Company’s consolidated portfolio and unconsolidated real estate ventures, the Company provides such tenant insurance through the Company’s wholly-owned captive insurance company and a separate reinsurance company in which the Company has a partial ownership interest. With respect to properties in the Company’s unconsolidated real estate ventures, the Company receives 50% of all proceeds from tenant insurance and tenant warranty protection programs at each unconsolidated real estate venture property in exchange for facilitating the programs at those properties. During the three months ended March 31, 2025 and 2024, the Company recognized $7.2 million and $4.7 million, respectively, of revenue related to these activities.

Gain on sale of self storage properties

The Company recognizes gains from disposition of properties only upon closing in accordance with the guidance on sales of nonfinancial assets. Profit on real estate sold is recognized upon closing when all, or substantially all, of the promised consideration has been received and is nonrefundable and the Company has transferred control of the facilities to the purchaser.

Investments in Unconsolidated Real Estate Ventures

The Company's investments in its unconsolidated real estate ventures are recorded under the equity method of accounting in the accompanying condensed consolidated financial statements. Under the equity method, the Company's investments in unconsolidated real estate ventures are stated at cost and adjusted for the Company's share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company's ownership interest in the earnings (losses) of the unconsolidated real estate ventures, except for the 2024 Joint Venture, for which the Company follows the hypothetical liquidation at book value ("HLBV") method. The Company follows the "nature of the distribution approach" for classification of distributions from its unconsolidated real estate ventures in its condensed consolidated statements of cash flows. Under this approach, distributions are reported on the basis of the nature of the activity or activities that generated the distributions as either a return on investment, which are classified as operating cash flows, or a return of investment (e.g., proceeds from the unconsolidated real estate ventures' sale of assets) which are reported as investing cash flows.

Noncontrolling Interests

All of the limited partner equity interests ("OP equity") in its operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than its operating partnership. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interests is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

Allocation of Net Income (Loss)

Effective July 1, 2024, in connection with the Company's internalization of its PRO structure, all outstanding subordinated performance units of our operating partnership ("subordinated performance units'") including all units of the DownREIT partnerships intended to be economically equivalent to the subordinated performance units ("DownREIT subordinated performance units") were converted into OP units and DownREIT OP units, respectively. For periods in which the subordinated performance units were outstanding, the Company allocated GAAP income utilizing the HLBV method, in which income or loss was allocated based on the change in each unitholders' claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. For periods in which the subordinated performance units are not outstanding, the Company allocates GAAP income based on the number of common shares and partnership units (including DownREIT OP units) outstanding.

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income (loss) within equity, as discussed further in Note 12.

Cash and Cash Equivalents

The Company considers all highly-liquid investments purchased with original maturities of three months or less to be cash equivalents. From time to time, the Company maintains cash balances in financial institutions in excess of federally insured limits. The Company has never experienced a loss that resulted from exceeding federally insured limits.

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions resulting from property sales for which we elected to purchase replacement property in accordance with Section 1031 of the Code, and for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

3 Months Ended

Mar. 31, 2025

Equity [Abstract]

SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

Shareholders' Equity

Series A Preferred Shares

The Company's 6.000% cumulative redeemable preferred shares of beneficial interest ("Series A Preferred Shares") rank senior to the Company's common shares with respect to dividend rights and rights upon its liquidation, dissolution or winding up. Dividends on the Series A Preferred Shares, which are payable quarterly in arrears, are cumulative from the date of original issuance in the amount of $1.50 per share each year. The Series A Preferred Shares became redeemable by the Company in October 2022 for a cash redemption price of $25.00 per share, plus accrued but unpaid dividends. The increase in Series A Preferred Shares outstanding from December 31, 2024 to March 31, 2025, was due to the issuance of 2,387 Series A Preferred Shares upon the redemption of an equivalent number of 6.000% Series A-1 Cumulative Redeemable Preferred Units ("Series A-1 preferred units"). As of March 31, 2025 the Company had 9,029,717 Series A Preferred Shares issued and outstanding.

At the Market ("ATM") Program

On November 19, 2024, the Company and its operating partnership entered into a sales agreement with certain sales agents, forward sellers and forward purchasers, pursuant to which the Company may sell from time to time up to $400.0 million of the Company's common shares in sales deemed to be "at the market offerings" (the "sales agreement"). The sales agreement contemplates that, in addition to the issuance and sale by the Company of offered shares to or through the sale agents, the Company may enter into separate forward sale agreements with any forward purchaser. If the Company enters into a forward sale agreement with any forward purchaser, such forward purchaser will attempt to borrow from third parties and sell, through the related agent, acting as sales agent for such forward purchaser (each, a "forward seller"), offered shares, in an amount equal to the offered shares subject to such forward sale agreement, to hedge such forward purchaser’s exposure under such forward sale agreement. The Company may offer the common shares through the agents, as the Company's sales agents, or, as applicable, as forward seller, or directly to the agents or forward sellers, acting as principals, by means of, among others, ordinary brokers’ transactions on the NYSE or otherwise at market prices prevailing at the time of sale or at negotiated prices.

During the three months ended March 31, 2025, the Company did not sell any common shares through the ATM program. As of March 31, 2025, the Company had $400.0 million of capacity remaining under its most recent ATM Program.

Common Share Repurchase Program

On July 11, 2022, the Company approved a share repurchase program authorizing, but not obligating, the repurchase of up to $400.0 million of the Company's common shares from time to time. On December 1, 2023, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $275.0 million of the Company's common shares from time to time. On November 14, 2024, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $350.0 million of the Company's common shares from time to time. The timing, manner, price and amount of any repurchase transactions will be determined by the Company in its discretion and will be subject to share price, availability, trading volume and general market conditions. Under these programs, the Company did not repurchase any common shares during the three months ended March 31, 2025 and has remaining capacity of approximately $350.3 million.

Noncontrolling Interests

All of the OP equity in the Company's operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the Company's operating partnership. NSA is the general partner of its operating partnership and is authorized to cause its operating partnership to issue additional partner interests, including preferred units, OP units and LTIP units at such prices and on such other terms as it determines in its sole discretion.

As of March 31, 2025 and December 31, 2024, units reflecting noncontrolling interests consisted of the following:

	March 31, 2025	December 31, 2024
Series A-1 preferred units	1,200,211	1,202,598
OP units	52,130,361	52,173,489
LTIP units	899,579	794,926
DownREIT units
DownREIT OP units	5,769,214	5,769,214
Total	59,999,365	59,940,227

Series A-1 Preferred Units

The Series A-1 preferred units rank senior to OP units and subordinated performance units in the Company's operating partnership with respect to distributions and liquidation. The Series A-1 preferred units have a stated value of $25.00 per unit and receive distributions at an annual rate of 6.000%. These distributions are cumulative. The Series A-1 preferred units are redeemable at the option of the holder after the first anniversary of the date of issuance, which redemption obligations may be satisfied at the Company’s option in cash in an amount equal to the market value of an equivalent number of the Series A Preferred Shares or the issuance of the Series A Preferred Shares on a one-for-one basis, subject to adjustments. Generally, the Series A-1 preferred units become redeemable by the Company beginning ten years after the initial issuance of each Series A-1 preferred unit at a stated value of $25.00 per unit, plus accrued but unpaid distributions. The decrease in Series A-1 preferred units outstanding from December 31, 2024 to March 31, 2025 was due to the redemption of 2,387 Series A-1 preferred units for an equivalent number of Series A Preferred Shares.

OP Units and DownREIT OP units

OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case. The holders of OP units are generally not entitled to elect redemption until one year after the issuance of the OP units. The holders of DownREIT OP units are generally not entitled to elect redemption until five years after the date of the contributor's initial contribution or such later date as may be agreed to by the contributor and the operating partnership.

The decrease in OP units outstanding from December 31, 2024 to March 31, 2025 was due to the redemption of 93,661 OP units for an equal number of common shares, partially offset by the conversion of 50,533 LTIP units into an equivalent number of OP units.

LTIP Units

LTIP units are a special class of partnership interest in the Company's operating partnership that allow the holder to participate in the ordinary and liquidating distributions received by holders of the OP units (subject to the achievement of specified levels of profitability by the Company's operating partnership or the achievement of certain events). LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above.

The increase in LTIP units outstanding from December 31, 2024 to March 31, 2025 was due to the issuance of 155,186 compensatory LTIP units to employees and trustees, net of forfeitures. This increase was partially offset by the conversion of 50,533 LTIP units into an equivalent number of OP units.

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SELF STORAGE PROPERTIES

3 Months Ended

Mar. 31, 2025

Real Estate [Abstract]

SELF STORAGE PROPERTIES

SELF STORAGE PROPERTIES

Self storage properties are summarized as follows (dollars in thousands):

	March 31, 2025		December 31, 2024
Land	$	1,046,061	$	1,047,416
Buildings and improvements	4,815,383		4,804,789
Furniture and equipment	12,055		11,929
Total self storage properties	5,873,499		5,864,134
Less accumulated depreciation	(1,095,918)		(1,051,638)
Self storage properties, net	$	4,777,581	$	4,812,496

Depreciation expense related to self storage properties amounted to $45.2 million and $45.4 million during the three months ended March 31, 2025 and 2024, respectively.

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

3 Months Ended

Mar. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES

2024 Joint Venture

On February 13, 2024, a wholly owned subsidiary of the Company (the "2024 NSA Member") entered into an agreement (the "2024 JV Agreement") to form a joint venture (the "2024 Joint Venture") with an affiliate of Heitman Capital Management LLC (the "2024 JV Investor" and, together with the 2024 NSA Member, the "2024 JV Members"). The 2024 Joint Venture was capitalized with approximately $140.8 million in equity (approximately $35.2 million from the 2024 NSA Member in exchange for a 25% ownership interest and approximately $105.6 million from the 2024 JV Investor in exchange for a 75% ownership interest) and proceeds from a $210.0 million interest-only secured debt financing with an interest rate of 6.05% per annum and a term of five years.

A subsidiary of the Company is acting as the non-member manager of the 2024 Joint Venture (the "2024 NSA Manager"). The 2024 NSA Manager directs, manages and controls the day-to-day operations and affairs of the 2024 Joint Venture but may not cause the 2024 Joint Venture to make certain major decisions involving the business of the 2024 Joint Venture without the consent of both 2024 JV Members, including the approval of annual budgets, sales and acquisitions of properties, financings, and certain actions relating to bankruptcy.

In February 2024, pursuant to a contribution agreement executed by the 2024 JV Members on December 21, 2023, in exchange for cash the Company contributed to the 2024 Joint Venture 56 self storage properties located across seven states, consisting of approximately 3.2 million rentable square feet configured in approximately 24,000 storage units.

As of March 31, 2025, the 2024 Joint Venture owned and operated 56 self storage properties containing approximately 3.2 million rentable square feet, configured in approximately 24,000 storage units and located across seven states.

2023 Joint Venture

On December 15, 2023, the Company, through a newly formed subsidiary (the "2023 NSA Member"), entered into an agreement (the "2023 JV Agreement") to form a joint venture (the "2023 Joint Venture") with a state pension fund advised by Heitman Capital Management LLC (the "2023 JV Investor," together with the 2023 NSA Member, the "2023 JV Members") to acquire and operate self storage properties. The 2023 JV Agreement provides for equity capital contributions by the 2023 JV Members of up to $400.0 million over a twenty-four month investment period (subject to two six-month extension options if both of the 2023 JV Members agree) starting in December 2023, with the 2023 JV Investor holding a 75% ownership interest and the 2023 NSA Member holding a 25% ownership interest.

A subsidiary of the Company is acting as the non-member manager of the 2023 Joint Venture (the "2023 NSA Manager"). The 2023 NSA Manager directs, manages and controls the day-to-day operations and affairs of the 2023 Joint Venture but may not cause the 2023 Joint Venture to make certain major decisions involving the business of the 2023 Joint Venture without the consent of both 2023 JV Members, including the approval of annual budgets, sales and acquisitions of properties, financings, and certain actions relating to bankruptcy.

During the three months ended September 2024, the 2023 Joint Venture acquired 18 self storage properties located across two states, consisting of approximately 1.2 million rentable square feet configured in approximately 8,000 storage units for approximately $147.9 million. The 2023 Joint Venture financed the acquisitions with capital contributions from the 2023 JV Members, of which the Company contributed approximately $37.0 million.

As of March 31, 2025, the 2023 Joint Venture owned and operated 18 self storage properties containing approximately 1.2 million rentable square feet, configured in approximately 8,000 storage units and located across two states.

2018 Joint Venture

As of March 31, 2025, the Company's unconsolidated real estate venture, formed in September 2018 with an affiliate of Heitman America Real Estate REIT LLC (the "2018 Joint Venture"), in which the Company has a 25% ownership interest, owned and operated 104 self storage properties containing approximately 7.9 million rentable square feet, configured in approximately 65,000 storage units and located across 17 states.

2016 Joint Venture

As of March 31, 2025, the Company's unconsolidated real estate venture, formed in September 2016 with a state pension fund advised by Heitman Capital Management LLC (the "2016 Joint Venture"), in which the Company has a 25% ownership interest, owned and operated 81 properties containing approximately 5.7 million rentable square feet, configured in approximately 47,000 storage units and located across 13 states.

The following table presents the combined condensed financial position of the Company's unconsolidated real estate ventures as of March 31, 2025 and December 31, 2024 (dollars in thousands):

	March 31, 2025		December 31, 2024
ASSETS
Self storage properties, net	$	2,703,146	$	2,700,632
Less accumulated depreciation	(465,102)		(445,006)
Self storage properties, net	2,238,044		2,255,626
Other assets	35,884		43,513
Total assets	$	2,273,928	$	2,299,139
LIABILITIES AND EQUITY
Debt financing	$	1,213,458	$	1,213,169
Other liabilities	32,233		37,206
Equity	1,028,237		1,048,764
Total liabilities and equity	$	2,273,928	$	2,299,139

The following tables present the combined condensed operating information of the Company's unconsolidated real estate ventures for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Total revenue	$	61,624	$	56,096
Property operating expenses	(22,416)		(17,603)
Supervisory, administrative and other expenses	(4,041)		(3,658)
Depreciation and amortization	(21,644)		(18,206)
Interest expense	(13,645)		(12,100)
Acquisition and other expenses	(150)		(59)
Net (loss) income	$	(272)	$	4,470

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ACQUISITIONS AND DISPOSITIONS

3 Months Ended

Mar. 31, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

ACQUISITIONS AND DISPOSITIONS

ACQUISITIONS AND DISPOSITIONS

Acquisitions

During three months ended March 31, 2025, the Company acquired three self storage properties and an annex to an existing property for approximately $13.5 million. All of these acquisitions were acquired by the Company from third parties. The self storage property acquisitions were accounted for as asset acquisitions and accordingly, $0.1 million of transaction costs related to the acquisitions were capitalized as part of the basis of the acquired properties. The Company allocated the total purchase price of the acquired properties to the assets acquired and liabilities assumed based on their relative fair values. The Company allocated a portion of the purchase price to identifiable intangible assets consisting of customer in-place leases which were recorded at estimated fair values of $0.3 million resulting in a total fair value of $13.2 million allocated to real estate.

The following table summarizes the investments in self storage property acquisitions completed by the Company during the three months ended March 31, 2025 (dollars in thousands):

Acquisitions closed during the Three Months Ended:		Summary of Investment(1)
	Number of Properties	Cash and Acquisition Costs		Value of Equity		Other		Total
March 31, 2025	3	$	12,434	$	—	$	1,060	$	13,494

(1)Investment amounts include investments classified as annexes to existing properties.

Dispositions

During the three months ended March 31, 2025, the Company sold two self storage properties to third parties for net proceeds of approximately $9.8 million. The Company recorded a net gain on the dispositions of $1.4 million

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OTHER ASSETS

3 Months Ended

Mar. 31, 2025

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

OTHER ASSETS

OTHER ASSETS

Other assets consist of the following (dollars in thousands):

	March 31, 2025		December 31, 2024
Customer in-place leases, net of accumulated amortization of $777 and $380, respectively	$	995	$	1,058
Receivables:
Trade, net	6,835		8,689
Tenant insurance, former PROs and other	8,564		10,169
Receivable from unconsolidated real estate ventures	4,853		8,057
Property acquisition deposits	369		198
Interest rate swaps	12,249		22,596
Prepaid expenses and other	7,859		11,392
Corporate furniture, equipment and other, net	2,726		2,916
Trade names	12,256		12,256
Management contracts, net of accumulated amortization of $9,983 and $9,117, respectively	41,982		42,848
Tenant reinsurance intangible assets, net of accumulated amortization of $7,176 and $6,264, respectively	89,209		90,121
Goodwill	8,182		8,182
Total	$	196,079	$	218,482

Amortization expense related to customer in-place leases amounted to $0.4 million and $1.0 million for the three months ended March 31, 2025 and 2024, respectively. Amortization expense related to management contracts amounted to $1.3 million and $0.3 million for the three months ended March 31, 2025 and 2024, respectively. Amortization expense related to the tenant reinsurance intangible amounted to $0.9 million and $0.3 million for the three months ended March 31, 2025 and 2024, respectively.

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DEBT FINANCING

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

DEBT FINANCING

DEBT FINANCING

The Company's outstanding debt as of March 31, 2025 and December 31, 2024 is summarized as follows (dollars in thousands):

	Interest Rate(1)		March 31, 2025		December 31, 2024
Credit Facility:
Revolving line of credit	5.71	%	$	420,800	$	443,300
Term loan D	3.96	%	275,000		275,000
Term loan E	4.89	%	130,000		130,000
2028 Term loan facility	4.62	%	75,000		75,000
April 2029 Term loan facility	4.27	%	100,000		100,000
June 2029 Term loan facility	5.37	%	285,000		285,000
May 2026 Senior Unsecured Notes	2.16	%	35,000		35,000
October 2026 Senior Unsecured Notes	6.46	%	65,000		65,000
July 2028 Senior Unsecured Notes	5.75	%	120,000		120,000
September 2028 Senior Unsecured Notes	5.40	%	75,000		75,000
October 2028 Senior Unsecured Notes	6.55	%	100,000		100,000
2029 Senior Unsecured Notes	3.98	%	100,000		100,000
August 2030 Senior Unsecured Notes	2.99	%	150,000		150,000
October 2030 Senior Unsecured Notes	6.66	%	35,000		35,000
November 2030 Senior Unsecured Notes	2.72	%	75,000		75,000
May 2031 Senior Unsecured Notes	3.00	%	90,000		90,000
August 2031 Senior Unsecured Notes	4.08	%	50,000		50,000
September 2031 Senior Unsecured Notes	5.55	%	125,000		125,000
November 2031 Senior Unsecured Notes	2.81	%	175,000		175,000
August 2032 Senior Unsecured Notes	3.09	%	100,000		100,000
November 2032 Senior Unsecured Notes	5.06	%	200,000		200,000
May 2033 Senior Unsecured Notes	3.10	%	55,000		55,000
October 2033 Senior Unsecured Notes	6.73	%	50,000		50,000
November 2033 Senior Unsecured Notes	2.96	%	125,000		125,000
2034 Senior Unsecured Notes	5.74	%	150,000		150,000
2036 Senior Unsecured Notes	3.06	%	75,000		75,000
Fixed rate mortgages payable	3.54	%	200,260		200,793
Total principal			3,436,060		3,459,093
Unamortized debt issuance costs and debt premium, net			(9,394)		(10,006)
Total debt			$	3,426,666	$	3,449,087

(1)Represents the effective interest rate as of March 31, 2025. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.

As of March 31, 2025, the Company's unsecured credit facility provided for total borrowings of $1.355 billion (the "credit facility") consisting of the following components: (i) a revolving line of credit (the "Revolver") which provides for a total borrowing commitment up to $950.0 million, under which the Company may borrow, repay and re-borrow amounts, (ii) a $275.0 million tranche D term loan facility (the "Term Loan D") and (iii) a $130.0 million tranche E term loan facility (the "Term Loan E"). As of March 31, 2025, the Company had an expansion option under the credit facility, which, if exercised in full, would provide for a total borrowing capacity of $1.900 billion.

As of March 31, 2025, the Company had outstanding letters of credit totaling $6.7 million and would have had the capacity to borrow remaining Revolver commitments of $522.5 million while remaining in compliance with the credit facility's financial covenants. At March 31, 2025, the Company was in compliance with all such covenants.

Future Debt Obligations

Based on existing debt agreements in effect as of March 31, 2025, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (dollars in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs		Total
Remainder of 2025	$	1,651	$	(1,928)	$	(277)
2026	377,322		(2,285)		375,037
2027	638,169		(1,664)		636,505
2028	460,624		(1,369)		459,255
2029	487,789		(649)		487,140
2030	262,964		(376)		262,588
Thereafter	1,207,541		(1,123)		1,206,418
	$	3,436,060	$	(9,394)	$	3,426,666

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EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per common share for the three months ended March 31, 2025 and 2024 (dollars in thousands, except per share amounts):

	Three Months Ended March 31,
	2025		2024
Earnings per common share - basic and diluted
Numerator
Net income	$	19,519	$	95,088
Net income attributable to noncontrolling interests	(6,525)		(36,061)
Net income attributable to National Storage Affiliates Trust	12,994		59,027
Distributions to preferred shareholders	(5,114)		(5,110)
Distributed and undistributed earnings allocated to participating securities	(15)		(13)
Net income attributable to common shareholders - basic	7,865		53,904
Effect of assumed conversion of dilutive securities	—		35,218
Net income attributable to common shareholders - diluted	$	7,865	$	89,122
Denominator
Weighted average shares outstanding - basic	76,372		80,236
Effect of dilutive securities:
Weighted average OP units outstanding	—		37,633
Weighted average DownREIT OP unit outstanding	—		2,120
Weighted average LTIP units outstanding	—		128
Weighted average subordinated performance units and DownREIT subordinated performance unit	—		18,031
Weighted average shares outstanding - diluted	76,372		138,148
Earnings per share - basic	$	0.10	$	0.67
Earnings per share - diluted	$	0.10	$	0.65

Outstanding equity interests of the Company's operating partnership and DownREIT partnerships are considered potential common shares for purposes of calculating diluted earnings per share as the unitholders may, through the exercise of redemption rights, obtain common shares, subject to various restrictions. Basic earnings per share is calculated based on the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated by further adjusting for the dilutive impact using the treasury stock method for unvested LTIP units subject to a service condition outstanding during the period and the if-converted method for any convertible securities outstanding during the period.

Generally, following certain lock-out periods, OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, subject to certain adjustments and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case.

LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above. Certain LTIP units vested prior to or upon the completion of the Company's initial public offering and certain LTIP units have vested upon the satisfaction of a service or market condition or will vest upon the satisfaction of future service and market conditions. Vested LTIP units and unvested LTIP units that vest based on a service or market condition are allocated income or loss in a similar manner as OP units. Unvested LTIP units subject to a service or market condition are evaluated for dilution using the treasury stock method. For the three months ended March 31, 2025, 779,408 unvested LTIP units that vest based on a service or market condition are excluded from the calculation of diluted earnings per share as they are not dilutive to earnings per share.

Effective as of July 1, 2024, in connection with the Company's internalization of its PRO structure, all outstanding subordinated performance units and DownREIT subordinated performance units were converted into OP units and DownREIT OP units, respectively. For periods in which the subordinated performance units were outstanding, the Company calculated the potentially dilutive impact of such units by assuming a hypothetical conversion into OP units and DownREIT OP units and considering the GAAP income that was allocated to such units.

For the three months ended March 31, 2025, potential common shares totaling 58.1 million related to OP units, DownREIT OP units and vested LTIP units have been excluded from the calculation of diluted earnings per share as they are not dilutive to earnings per share.

Participating securities, which consist of unvested restricted common shares, receive dividends equal to those received by common shares. The effect of participating securities for the periods presented above is calculated using the two-class method of allocating distributed and undistributed earnings.

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RELATED PARTY TRANSACTIONS

3 Months Ended

Mar. 31, 2025

Related Party Transactions [Abstract]

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

Effective July 1, 2024, in connection with the internalization of its PRO structure, the Company purchased the PROs' management contracts. As of March 31, 2025, the majority of operations have transitioned to the Company.

Supervisory and Administrative Fees

During the three months ended March 31, 2024, the Company incurred $5.1 million for supervisory and administrative fees to its former PROs pursuant to their respective management contracts. In connection with the internalization of the PRO structure, the Company entered into new asset management agreements with certain of its former PROs to continue to provide leasing, operating, supervisory and administrative services for certain self storage properties on a transitionary basis. These new asset management agreements generally provided for fees ranging from 5% to 6% of gross revenue for such managed self storage properties. Under the current asset management agreements with former PROs, during the three months ended March 31, 2025, the Company incurred $1.4 million for supervisory and administrative fees. Supervisory and administrative fees are included in general and administrative expenses in the accompanying condensed consolidated statements of operations.

Payroll Services

For the self storage properties that were managed by the Company's former PROs, and pursuant to their respective management contracts and new asset management agreements, the employees responsible for operations were employees of the Company's former PROs who charged the Company for the costs associated with the respective employees. For the three months ended March 31, 2025 and 2024, the Company incurred $1.8 million and $6.9 million, respectively, for payroll and related costs reimbursable to these former PROs. Such costs are included in property operating expenses in the accompanying condensed consolidated statements of operations.

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is subject to litigation, claims, and assessments that may arise in the ordinary course of its business activities. Such matters include contractual matters, employment related issues, and regulatory proceedings. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on the Company's financial position, results of operations, or liquidity.

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The Company sometimes limits its exposure to interest rate fluctuations by entering into interest rate swap agreements. The interest rate swap agreements moderate the Company's exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. The Company does not use derivatives for trading or speculative purposes. The Company measures its interest rate swap derivatives at fair value on a recurring basis. The changes in the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings.

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

				Fair Value
	Number of Contracts	Notional Amount		Other Assets, net		Interest Rate Swap Liabilities
As of March 31, 2025
Interest Rate Swaps	10	$	860,000	$	12,249	$	1,196
As of December 31, 2024
Interest Rate Swaps	12	$	1,085,000	$	22,596	$	471

The following table presents the effect of our derivative instruments on our condensed consolidated financial statements (dollars in thousands):

Fair value at December 31, 2023	$	26,160
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(9,355)
Unrealized gains and realized (losses) on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	20,413
Fair value at March 31, 2024	$	37,218
Fair value at December 31, 2024	$	22,125
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(3,273)
Unrealized and realized losses on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	(7,799)
Fair value at March 31, 2025	$	11,053

As of March 31, 2025 and December 31, 2024, the Company had outstanding interest rate swaps with aggregate current notional amounts of $860.0 million and $1,085.0 million, respectively, designated as cash flow hedges. As of March 31, 2025, the Company's swaps had a weighted average remaining term of approximately 3.0 years.

In connection with the issuance of fixed rate unsecured notes in the second quarter of 2023, we entered into $50.0 million of forward starting interest rate swaps on March 16, 2023, and a $25.0 million forward starting interest rate swap on March 24, 2023, locking the interest rate of compounded SOFR at 3.25% through April 5, 2023. These interest rate swaps have been designated as cash flow hedges. The realized loss of $1.6 million of the compounded SOFR swaps are included in unrealized and realized gains (loss) on derivative instruments in comprehensive income (loss) and will be reclassified into interest expense over 10 years, which is the term of anticipated unsecured fixed rate debt including any replacement debt thereof. Amounts reported in accumulated other comprehensive (loss) income will be reclassified into interest expense as interest payments are made on the anticipated debt.

The fair value of these swaps are included in other assets and liabilities in the Company's condensed consolidated balance sheets, and the Company recognizes any changes in the fair value as an adjustment of accumulated other comprehensive income (loss) within equity. If the forward rates at March 31, 2025 remain constant, the Company estimates that during the next 12 months, the Company would reclassify into earnings, as a reduction in interest expense, approximately $7.0 million of the unrealized gains included in accumulated other comprehensive income (loss). If market interest rates remain above the 3.08% weighted average fixed rate under these interest rate swaps the Company will continue to receive payments due to it from its counterparties to the interest rate swaps.

There were no transfers between levels of the three-tier fair value measurement hierarchy during the three months ended March 31, 2025 and 2024. For financial assets and liabilities that utilize Level 2 inputs, the Company utilizes both direct and indirect observable price quotes, including applicable yield curves. The Company uses valuation techniques for Level 2 financial assets and liabilities which include applicable yield curves at the reporting date as well as assessing counterparty credit risk. Counterparties to these contracts are highly rated financial institutions. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with the Company's derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by the Company and the counterparties. As of March 31, 2025 and 2024, the Company determined that the effect of credit valuation adjustments on the overall valuation of its derivative positions are not significant to the overall valuation of its derivatives. Therefore, the Company has determined that its derivative valuations are appropriately classified in Level 2 of the fair value hierarchy.

Fair Value Disclosures

The carrying values of cash and cash equivalents, restricted cash, trade receivables, accounts payable and accrued liabilities reflected in the condensed consolidated balance sheets at March 31, 2025 and 2024, approximate fair value due to the short term nature of these financial assets and liabilities. The carrying value of variable rate debt financing, comprising the Revolver, term loans under our credit facility and our term loan facilities, reflected in the condensed consolidated balance sheets at March 31, 2025 and 2024, approximates fair value as the changes in their associated interest rates reflect the current market and credit risk, which is similar to when the loans were originally obtained.

The fair values of fixed rate private placement notes and mortgages were estimated using the discounted estimated future cash payments to be made on such debt; the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality (categorized within Level 2 of the fair value hierarchy).

The following table presents the carrying value and estimated fair value of our fixed rate private placement notes and mortgages (dollars in thousands):

	Carrying Value(1)				Fair Value
	March 31, 2025		December 31, 2024		March 31, 2025		December 31, 2024
Liabilities
Private Placement Notes	$	1,950,000	$	1,950,000	$	1,815,416	$	1,774,291
Mortgage Notes	200,260		200,793		193,394		190,966

(1) Carrying value represents the principal balance outstanding

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SEGMENTS

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

SEGMENTS

Segments

The Company manages the business as one reportable segment consisting of owning and managing self storage properties located in the United States. The Company collects rental revenue from customers for space rentals and related fees. Although the Company has several operating segments consisting of self storage properties in different geographic markets, these operating segments have been aggregated into one reportable segment based on the similar economic characteristics among all markets. The Company considers factors such as the physical and economic characteristics of its properties and the related operating activities in determining its operating segments. Operating segments that exhibit similar physical and economic characteristics and other operating similarities have been aggregated. The Company has other operating segments, consisting of activities other than owning and managing self storage properties, that are insignificant based on the guidance set forth in ASC 280, and included under the heading "All Other."

The Company's chief operating decision maker ("CODM") is its President and Chief Executive Officer. The CODM uses net operating income ("NOI") to assess segment performance and allocate resources. NOI is the key measure used by the CODM to evaluate the economic productivity from owning and managing the Company's self storage properties, as it enables the CODM to evaluate the operating performance of the Company's self storage properties on a consistent and comparable basis from period to period.

Reportable segment asset information is not provided to the CODM as the CODM does not use segment asset information to evaluate the business and allocate resources.

The following table presents our reportable segment NOI for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Property operating expenses
Store payroll and related costs	12,914		13,523
Property tax expense	15,917		15,926
Utilities expense	5,724		5,422
Repairs & maintenance expense	5,003		4,297
Marketing expense	5,528		4,799
Insurance expense	2,689		2,751
Other property operating expenses	7,329		7,976
Total property operating expenses	55,104		54,694
Net operating income	$	121,115	$	132,380

NOI represents rental revenue plus other property-related revenue, minus property operating expenses. NOI excludes management fees and other revenue, general and administrative expenses, depreciation and amortization, interest expense, loss on early extinguishment of debt, equity in losses (earnings) of unconsolidated real estate ventures, acquisition costs, non-operating (income) expense, gain on sale of self storage properties or income tax expense.

The following table is a reconciliation of our reportable segment revenue to total revenue for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Management fees and other revenue	12,135		9,074
Total Revenue	$	188,354	$	196,148

The following table is a reconciliation of our reported income before income taxes to our net operating income for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Income before income taxes	$	20,639	$	95,974
All Other
Management fees and other revenue	(12,135)		(9,074)
General and administrative expenses	13,145		15,674
Depreciation and amortization	48,116		47,331
Other	4,476		3,492
Interest expense	40,475		38,117
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Acquisition and integration costs	2,445		507
Non-operating income	(360)		(98)
Gain on sale of self storage properties	(1,425)		(61,173)
Net operating income	$	121,115	$	132,380

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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net Income (Loss)	$ 12,994	$ 59,027

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Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2025

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly and year to date periods are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

Variable Interest Entities

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of the Company is its investment in its operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

Rental Revenue

Rental revenue

Rental revenue consists of space rentals and related fees. Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term.

Other property-related revenue and Management fees and other revenue

Other property-related revenue

Other property-related revenue primarily consists of ancillary revenues such as tenant insurance and/or tenant warranty protection-related access fees, sales of storage supplies and truck rentals which are recognized in the period earned.

The Company has tenant insurance and/or tenant warranty protection plan-related arrangements with insurance companies and the Company’s tenants. During the three months ended March 31, 2025 and 2024, the Company recognized $5.9 million and $5.6 million, respectively, of tenant insurance and tenant warranty protection plan revenues.

The Company sells boxes, packing supplies, locks, other retail merchandise and rents moving trucks at its properties. During the three months ended March 31, 2025 and 2024, the Company recognized retail sales of $0.4 million and $0.5 million, respectively.

Management fees and other revenue

Management fees and other revenue consist of property management fees, platform fees, call center fees, acquisition fees, amounts related to the facilitation of tenant warranty protection or tenant insurance programs for certain stores in the Company's consolidated portfolio and unconsolidated real estate ventures, access fees associated with tenant insurance-related arrangements, and profit distributions from the Company's interest in a reinsurance company.

With respect to the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture (each as defined in Note 5), the Company provides supervisory and administrative property management services, centralized call center services, and technology platform and revenue management services to the properties in the unconsolidated real estate ventures. The property management fees for the 2016 Joint Venture, the 2018 Joint Venture and the 2023 Joint Venture are equal to 6% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate ventures, and the platform fees are equal to $1,250 per month per unconsolidated real estate venture property. The property management fees for the 2024 Joint Venture are equal to 4% of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate venture. With respect to the 2016 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, the call center fee is equal to 1% of each of monthly gross revenues and net sales revenues. During the three months ended March 31, 2025 and 2024, the Company recognized property management fees, call center fees and platform fees of $4.7 million and $4.3 million, respectively.

The Company also earns acquisition fees for properties acquired by the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture. These fees are based on a percentage of the gross capitalization of the acquired assets determined by the members of the 2016 Joint Venture, the 2018 Joint Venture, the 2023 Joint Venture and the 2024 Joint Venture, and are generally earned when the unconsolidated real estate ventures obtain title and control of an acquired property. During the three months ended March 31, 2025 and 2024, the Company recognized no acquisition fees.

The Company provides or makes available tenant insurance or tenant warranty protection programs for tenants at its properties. For certain of the properties in the Company’s consolidated portfolio and unconsolidated real estate ventures, the Company provides such tenant insurance through the Company’s wholly-owned captive insurance company and a separate reinsurance company in which the Company has a partial ownership interest. With respect to properties in the Company’s unconsolidated real estate ventures, the Company receives 50% of all proceeds from tenant insurance and tenant warranty protection programs at each unconsolidated real estate venture property in exchange for facilitating the programs at those properties. During the three months ended March 31, 2025 and 2024, the Company recognized $7.2 million and $4.7 million, respectively, of revenue related to these activities.

Gain on sale of self storage properties

Gain on sale of self storage properties

The Company recognizes gains from disposition of properties only upon closing in accordance with the guidance on sales of nonfinancial assets. Profit on real estate sold is recognized upon closing when all, or substantially all, of the promised consideration has been received and is nonrefundable and the Company has transferred control of the facilities to the purchaser.

Investments in Unconsolidated Real Estate Ventures

Investments in Unconsolidated Real Estate Ventures

The Company's investments in its unconsolidated real estate ventures are recorded under the equity method of accounting in the accompanying condensed consolidated financial statements. Under the equity method, the Company's investments in unconsolidated real estate ventures are stated at cost and adjusted for the Company's share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company's ownership interest in the earnings (losses) of the unconsolidated real estate ventures, except for the 2024 Joint Venture, for which the Company follows the hypothetical liquidation at book value ("HLBV") method. The Company follows the "nature of the distribution approach" for classification of distributions from its unconsolidated real estate ventures in its condensed consolidated statements of cash flows. Under this approach, distributions are reported on the basis of the nature of the activity or activities that generated the distributions as either a return on investment, which are classified as operating cash flows, or a return of investment (e.g., proceeds from the unconsolidated real estate ventures' sale of assets) which are reported as investing cash flows.

Noncontrolling Interests

Noncontrolling Interests

All of the limited partner equity interests ("OP equity") in its operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than its operating partnership. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interests is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

Allocation of Net Income (Loss)

Allocation of Net Income (Loss)

Effective July 1, 2024, in connection with the Company's internalization of its PRO structure, all outstanding subordinated performance units of our operating partnership ("subordinated performance units'") including all units of the DownREIT partnerships intended to be economically equivalent to the subordinated performance units ("DownREIT subordinated performance units") were converted into OP units and DownREIT OP units, respectively. For periods in which the subordinated performance units were outstanding, the Company allocated GAAP income utilizing the HLBV method, in which income or loss was allocated based on the change in each unitholders' claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. For periods in which the subordinated performance units are not outstanding, the Company allocates GAAP income based on the number of common shares and partnership units (including DownREIT OP units) outstanding.

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income (loss) within equity, as discussed further in Note 12.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company considers all highly-liquid investments purchased with original maturities of three months or less to be cash equivalents. From time to time, the Company maintains cash balances in financial institutions in excess of federally insured limits. The Company has never experienced a loss that resulted from exceeding federally insured limits.

Restricted Cash

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions resulting from property sales for which we elected to purchase replacement property in accordance with Section 1031 of the Code, and for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Tables)

3 Months Ended

Mar. 31, 2025

Equity [Abstract]

Schedule of noncontrolling interests

As of March 31, 2025 and December 31, 2024, units reflecting noncontrolling interests consisted of the following:

	March 31, 2025	December 31, 2024
Series A-1 preferred units	1,200,211	1,202,598
OP units	52,130,361	52,173,489
LTIP units	899,579	794,926
DownREIT units
DownREIT OP units	5,769,214	5,769,214
Total	59,999,365	59,940,227

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SELF STORAGE PROPERTIES (Tables)

3 Months Ended

Mar. 31, 2025

Real Estate [Abstract]

Schedule of Self Storage Properties

Self storage properties are summarized as follows (dollars in thousands):

	March 31, 2025		December 31, 2024
Land	$	1,046,061	$	1,047,416
Buildings and improvements	4,815,383		4,804,789
Furniture and equipment	12,055		11,929
Total self storage properties	5,873,499		5,864,134
Less accumulated depreciation	(1,095,918)		(1,051,638)
Self storage properties, net	$	4,777,581	$	4,812,496

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES (Tables)

3 Months Ended

Mar. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Condensed Financial Information of Unconsolidated Real Estate Ventures

The following table presents the combined condensed financial position of the Company's unconsolidated real estate ventures as of March 31, 2025 and December 31, 2024 (dollars in thousands):

	March 31, 2025		December 31, 2024
ASSETS
Self storage properties, net	$	2,703,146	$	2,700,632
Less accumulated depreciation	(465,102)		(445,006)
Self storage properties, net	2,238,044		2,255,626
Other assets	35,884		43,513
Total assets	$	2,273,928	$	2,299,139
LIABILITIES AND EQUITY
Debt financing	$	1,213,458	$	1,213,169
Other liabilities	32,233		37,206
Equity	1,028,237		1,048,764
Total liabilities and equity	$	2,273,928	$	2,299,139

The following tables present the combined condensed operating information of the Company's unconsolidated real estate ventures for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Total revenue	$	61,624	$	56,096
Property operating expenses	(22,416)		(17,603)
Supervisory, administrative and other expenses	(4,041)		(3,658)
Depreciation and amortization	(21,644)		(18,206)
Interest expense	(13,645)		(12,100)
Acquisition and other expenses	(150)		(59)
Net (loss) income	$	(272)	$	4,470

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ACQUISITIONS AND DISPOSITIONS (Tables)

3 Months Ended

Mar. 31, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

Schedule of Self Storage Property Acquisitions

The following table summarizes the investments in self storage property acquisitions completed by the Company during the three months ended March 31, 2025 (dollars in thousands):

Acquisitions closed during the Three Months Ended:		Summary of Investment(1)
	Number of Properties	Cash and Acquisition Costs		Value of Equity		Other		Total
March 31, 2025	3	$	12,434	$	—	$	1,060	$	13,494

(1)Investment amounts include investments classified as annexes to existing properties.

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OTHER ASSETS (Tables)

3 Months Ended

Mar. 31, 2025

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Assets

Other assets consist of the following (dollars in thousands):

	March 31, 2025		December 31, 2024
Customer in-place leases, net of accumulated amortization of $777 and $380, respectively	$	995	$	1,058
Receivables:
Trade, net	6,835		8,689
Tenant insurance, former PROs and other	8,564		10,169
Receivable from unconsolidated real estate ventures	4,853		8,057
Property acquisition deposits	369		198
Interest rate swaps	12,249		22,596
Prepaid expenses and other	7,859		11,392
Corporate furniture, equipment and other, net	2,726		2,916
Trade names	12,256		12,256
Management contracts, net of accumulated amortization of $9,983 and $9,117, respectively	41,982		42,848
Tenant reinsurance intangible assets, net of accumulated amortization of $7,176 and $6,264, respectively	89,209		90,121
Goodwill	8,182		8,182
Total	$	196,079	$	218,482

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DEBT FINANCING (Tables)

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Schedule of Debt

The Company's outstanding debt as of March 31, 2025 and December 31, 2024 is summarized as follows (dollars in thousands):

	Interest Rate(1)		March 31, 2025		December 31, 2024
Credit Facility:
Revolving line of credit	5.71	%	$	420,800	$	443,300
Term loan D	3.96	%	275,000		275,000
Term loan E	4.89	%	130,000		130,000
2028 Term loan facility	4.62	%	75,000		75,000
April 2029 Term loan facility	4.27	%	100,000		100,000
June 2029 Term loan facility	5.37	%	285,000		285,000
May 2026 Senior Unsecured Notes	2.16	%	35,000		35,000
October 2026 Senior Unsecured Notes	6.46	%	65,000		65,000
July 2028 Senior Unsecured Notes	5.75	%	120,000		120,000
September 2028 Senior Unsecured Notes	5.40	%	75,000		75,000
October 2028 Senior Unsecured Notes	6.55	%	100,000		100,000
2029 Senior Unsecured Notes	3.98	%	100,000		100,000
August 2030 Senior Unsecured Notes	2.99	%	150,000		150,000
October 2030 Senior Unsecured Notes	6.66	%	35,000		35,000
November 2030 Senior Unsecured Notes	2.72	%	75,000		75,000
May 2031 Senior Unsecured Notes	3.00	%	90,000		90,000
August 2031 Senior Unsecured Notes	4.08	%	50,000		50,000
September 2031 Senior Unsecured Notes	5.55	%	125,000		125,000
November 2031 Senior Unsecured Notes	2.81	%	175,000		175,000
August 2032 Senior Unsecured Notes	3.09	%	100,000		100,000
November 2032 Senior Unsecured Notes	5.06	%	200,000		200,000
May 2033 Senior Unsecured Notes	3.10	%	55,000		55,000
October 2033 Senior Unsecured Notes	6.73	%	50,000		50,000
November 2033 Senior Unsecured Notes	2.96	%	125,000		125,000
2034 Senior Unsecured Notes	5.74	%	150,000		150,000
2036 Senior Unsecured Notes	3.06	%	75,000		75,000
Fixed rate mortgages payable	3.54	%	200,260		200,793
Total principal			3,436,060		3,459,093
Unamortized debt issuance costs and debt premium, net			(9,394)		(10,006)
Total debt			$	3,426,666	$	3,449,087

(1)Represents the effective interest rate as of March 31, 2025. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.

Schedule of Future Debt Maturities

Based on existing debt agreements in effect as of March 31, 2025, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (dollars in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs		Total
Remainder of 2025	$	1,651	$	(1,928)	$	(277)
2026	377,322		(2,285)		375,037
2027	638,169		(1,664)		636,505
2028	460,624		(1,369)		459,255
2029	487,789		(649)		487,140
2030	262,964		(376)		262,588
Thereafter	1,207,541		(1,123)		1,206,418
	$	3,436,060	$	(9,394)	$	3,426,666

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EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Schedule of the Computation of Basic and Diluted Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share for the three months ended March 31, 2025 and 2024 (dollars in thousands, except per share amounts):

	Three Months Ended March 31,
	2025		2024
Earnings per common share - basic and diluted
Numerator
Net income	$	19,519	$	95,088
Net income attributable to noncontrolling interests	(6,525)		(36,061)
Net income attributable to National Storage Affiliates Trust	12,994		59,027
Distributions to preferred shareholders	(5,114)		(5,110)
Distributed and undistributed earnings allocated to participating securities	(15)		(13)
Net income attributable to common shareholders - basic	7,865		53,904
Effect of assumed conversion of dilutive securities	—		35,218
Net income attributable to common shareholders - diluted	$	7,865	$	89,122
Denominator
Weighted average shares outstanding - basic	76,372		80,236
Effect of dilutive securities:
Weighted average OP units outstanding	—		37,633
Weighted average DownREIT OP unit outstanding	—		2,120
Weighted average LTIP units outstanding	—		128
Weighted average subordinated performance units and DownREIT subordinated performance unit	—		18,031
Weighted average shares outstanding - diluted	76,372		138,148
Earnings per share - basic	$	0.10	$	0.67
Earnings per share - diluted	$	0.10	$	0.65

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Interest Rate Swap Derivatives Measured at Fair Value

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

				Fair Value
	Number of Contracts	Notional Amount		Other Assets, net		Interest Rate Swap Liabilities
As of March 31, 2025
Interest Rate Swaps	10	$	860,000	$	12,249	$	1,196
As of December 31, 2024
Interest Rate Swaps	12	$	1,085,000	$	22,596	$	471

The following table presents the effect of our derivative instruments on our condensed consolidated financial statements (dollars in thousands):

Fair value at December 31, 2023	$	26,160
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(9,355)
Unrealized gains and realized (losses) on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	20,413
Fair value at March 31, 2024	$	37,218
Fair value at December 31, 2024	$	22,125
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(3,273)
Unrealized and realized losses on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	(7,799)
Fair value at March 31, 2025	$	11,053

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

	Carrying Value(1)				Fair Value
	March 31, 2025		December 31, 2024		March 31, 2025		December 31, 2024
Liabilities
Private Placement Notes	$	1,950,000	$	1,950,000	$	1,815,416	$	1,774,291
Mortgage Notes	200,260		200,793		193,394		190,966

(1) Carrying value represents the principal balance outstanding

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SEGMENTS (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents our reportable segment NOI for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Property operating expenses
Store payroll and related costs	12,914		13,523
Property tax expense	15,917		15,926
Utilities expense	5,724		5,422
Repairs & maintenance expense	5,003		4,297
Marketing expense	5,528		4,799
Insurance expense	2,689		2,751
Other property operating expenses	7,329		7,976
Total property operating expenses	55,104		54,694
Net operating income	$	121,115	$	132,380

Reconciliation of Revenue from Segments to Consolidated

The following table is a reconciliation of our reportable segment revenue to total revenue for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Reportable segment revenue
Rental revenue	$	169,475	$	180,382
Other property-related revenue	6,744		6,692
Total reportable segment revenue	176,219		187,074
Management fees and other revenue	12,135		9,074
Total Revenue	$	188,354	$	196,148

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

The following table is a reconciliation of our reported income before income taxes to our net operating income for the three months ended March 31, 2025 and 2024 (dollars in thousands):

	Three Months Ended March 31,
	2025		2024
Income before income taxes	$	20,639	$	95,974
All Other
Management fees and other revenue	(12,135)		(9,074)
General and administrative expenses	13,145		15,674
Depreciation and amortization	48,116		47,331
Other	4,476		3,492
Interest expense	40,475		38,117
Equity in losses of unconsolidated real estate ventures	5,739		1,630
Acquisition and integration costs	2,445		507
Non-operating income	(360)		(98)
Gain on sale of self storage properties	(1,425)		(61,173)
Net operating income	$	121,115	$	132,380

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ORGANIZATION AND NATURE OF OPERATIONS (Details) storage_unit in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2025 ft² state storage_unit property metropolitan_statistical_area
Schedule of Equity Method Investments [Line Items]
Number of top metropolitan statistical areas for focus of operations | metropolitan_statistical_area	100
Number of self storage properties	1,075
Number of states in which self storage properties are located | state	41
Total rentable square feet in self storage properties | ft²	70.2
Number of units in real estate property | storage_unit	553
Consolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	816
Number of states in which self storage properties are located | state	37
Total rentable square feet in self storage properties | ft²	52.2
Number of storage units | storage_unit	410
Unconsolidated properties | 2018 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
Unconsolidated properties | 2016 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
Unconsolidated properties | Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	259
Number of states in which self storage properties are located | state	24
Total rentable square feet in self storage properties | ft²	18.0
Number of units in real estate property | storage_unit	143
Unconsolidated properties | Joint Venture | 2018 Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	104
Number of states in which self storage properties are located | state	17
Total rentable square feet in self storage properties | ft²	7.9
Number of units in real estate property | storage_unit	65
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
Unconsolidated properties | Joint Venture | 2016 Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	81
Number of states in which self storage properties are located | state	13
Total rentable square feet in self storage properties | ft²	5.7
Number of units in real estate property	47,000
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Mar. 31, 2025 USD ($) property partnership	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Variable Interest Entity [Line Items]
Number of self storage properties | property	1,075
Self storage properties, net	$ 4,777,581,000		$ 4,812,496,000
Principal amount	$ 3,436,060,000		3,459,093,000
Property management fees as percent of monthly gross revenues and net sales revenue of unconsolidated real estate venture assets	4.00%
Tenant Insurance and Tenant Warranty Protection Plan Revenues
Variable Interest Entity [Line Items]
Revenue	$ 5,900,000	$ 5,600,000
Retail Products and Supplies
Variable Interest Entity [Line Items]
Revenue	400,000	500,000
Property Management, Call Center, and Platform Fees
Variable Interest Entity [Line Items]
Revenue	$ 4,700,000	4,300,000
Property management fees as percent of monthly gross revenues and net sales revenue of unconsolidated real estate venture assets	6.00%
Platform fees per unconsolidated real estate venture property per month	$ 1,250
Call center fees as percent of monthly gross revenues and net sales revenue of unconsolidated real estate venture assets	1.00%
Tenant Warranty Protection or Tenant Insurance
Variable Interest Entity [Line Items]
Revenue	$ 7,200,000	$ 4,700,000
Percent of total warranty protection plan proceeds received per unconsolidated real estate venture property	50.00%
Fixed Rate Mortgages | Mortgages
Variable Interest Entity [Line Items]
Principal amount	$ 200,260,000		200,793,000
VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of partnerships considered to be VIEs | partnership	22
Number of self storage properties | property	49
Self storage properties, net	$ 404,200,000		407,100,000
VIE, Primary Beneficiary | Fixed Rate Mortgages | Mortgages
Variable Interest Entity [Line Items]
Principal amount	$ 172,900,000		$ 172,900,000

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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Nov. 19, 2024	Nov. 14, 2024	Dec. 31, 2023	Jul. 11, 2022
Class of Stock [Line Items]
Preferred shares of beneficial interest, outstanding (in shares)	14,697,845		14,695,458
Authorized amount					$ 350.0	$ 275.0	$ 400.0
Remaining authorized, amount	$ 350.3
Common Shares
Class of Stock [Line Items]
Redemptions/conversions of units (in shares)	93,661	72,802
Prior Sales Agreement
Class of Stock [Line Items]
Value of common and preferred shares authorized under ATM program				$ 400.0
At The Market Program
Class of Stock [Line Items]
Value of remaining available offered shares	$ 400.0
Series A Preferred Shares
Class of Stock [Line Items]
Preferred shares of beneficial interest, outstanding (in shares)	9,029,717
NSA OP, LP | Series A-1 preferred units
Class of Stock [Line Items]
Preferred share/unit dividend rate (percent)	6.00%
Preferred units cash redemption price (in dollars per share)	$ 25.00
Unit conversion ratio	1
Minimum conversion period (in years)	10 years
NSA OP, LP | OP units
Class of Stock [Line Items]
Unit conversion ratio	1
Minimum conversion period (in years)	1 year
NSA OP, LP | OP units | Common Shares
Class of Stock [Line Items]
Redemptions/conversions of units (in shares)	93,661
NSA OP, LP | LTIP units
Class of Stock [Line Items]
Unit conversion ratio	1
Conversion of units (in shares)	50,533
Issuance of preferred shares (in shares)	50,533
NSA OP, LP | Class B Unit | Retirement of Northwest
Class of Stock [Line Items]
Issuance of preferred shares (in shares)	155,186
DownREIT Partnership | OP units
Class of Stock [Line Items]
Unit conversion ratio	1
Minimum conversion period (in years)	5 years
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share
Class of Stock [Line Items]
Preferred share/unit dividend rate (percent)	6.00%
Preferred dividends in arrears (in dollars per share)	$ 1.50
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share | Series A-1 preferred units
Class of Stock [Line Items]
Preferred share/unit dividend rate (percent)	6.00%
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share | NSA OP, LP
Class of Stock [Line Items]
Preferred units cash redemption price (in dollars per share)	$ 25.00
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share | NSA OP, LP | Series A Preferred Shares
Class of Stock [Line Items]
Redemptions/conversions of units (in shares)	2,387
Common Shares of Beneficial Interest, $0.01 par value per share | At The Market Program
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	0

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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Equity Interests (Details) - shares	Mar. 31, 2025	Dec. 31, 2024
Partnership Subsidiaries
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	59,999,365	59,940,227
Series A-1 preferred units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	1,200,211	1,202,598
OP units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	52,130,361	52,173,489
OP units | DownREIT Partnership
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	5,769,214	5,769,214
LTIP units | NSA OP, LP
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	899,579	794,926

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SELF STORAGE PROPERTIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Real Estate [Abstract]
Land	$ 1,046,061		$ 1,047,416
Buildings and improvements	4,815,383		4,804,789
Furniture and equipment	12,055		11,929
Total self storage properties	5,873,499		5,864,134
Less accumulated depreciation	(1,095,918)		(1,051,638)
Self storage properties, net	4,777,581		$ 4,812,496
Depreciation expense related to self storage properties	$ 45,200	$ 45,400

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details) storage_unit in Thousands, $ in Thousands, ft² in Millions			3 Months Ended
	Feb. 13, 2024 USD ($)	Dec. 15, 2023 USD ($) extension_period	Sep. 30, 2024 USD ($) ft² property storage_unit state	Mar. 31, 2025 USD ($) ft² property state storage_unit	Dec. 31, 2024 USD ($)	Feb. 29, 2024 ft² property storage_unit state
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property				1,075
Number of states in which self storage properties are located | state				41
Total rentable square feet in self storage properties | ft²				70.2
Investment in unconsolidated real estate ventures | $				$ 235,591	$ 246,193
Number of units in real estate property | storage_unit				553
Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property				259
Number of states in which self storage properties are located | state				24
Total rentable square feet in self storage properties | ft²				18.0
Number of units in real estate property | storage_unit				143
Joint Venture | Unconsolidated properties | 2023 Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property			18
Number of states in which self storage properties are located | state			2
Total rentable square feet in self storage properties | ft²			1.2
Number of units in real estate property | storage_unit			8
2024 Joint Venture
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures | $	$ 210,000
Company's equity interest in unconsolidated real estate ventures (percent)	6.05%
Real estate investments, joint ventures, maturity period	5 years
2024 Joint Venture | Joint Venture
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures | $	$ 140,800
2024 Joint Venture | Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property				56		56
Number of states in which self storage properties are located | state				7		7
Total rentable square feet in self storage properties | ft²				3.2		3.2
Number of storage units | storage_unit				24		24
2024 Joint Venture | 2024 NSA Member
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures | $	$ 35,200
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
2024 Joint Venture | 2024 JV Investor
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures | $	$ 105,600
Company's equity interest in unconsolidated real estate ventures (percent)	75.00%
2023 Joint Venture
Schedule of Equity Method Investments [Line Items]
Real estate investments, joint ventures | $			$ 37,000
Real estate investments, joint ventures, maturity period		24 months
Number of extension periods | extension_period		2
Extension period		6 months
Payments to acquire interest in joint venture | $			$ 147,900
2023 Joint Venture | Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property				18
Number of states in which self storage properties are located | state				2
Total rentable square feet in self storage properties | ft²				1.2
Number of units in real estate property | storage_unit				8
2023 Joint Venture | 2023 JV Members
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		75.00%
Investment in unconsolidated real estate ventures | $		$ 400,000
2023 Joint Venture | 2023 NSA Member
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)		25.00%
2018 Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)				25.00%
2018 Joint Venture | Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)				25.00%
Number of self storage properties | property				104
Number of states in which self storage properties are located | state				17
Total rentable square feet in self storage properties | ft²				7.9
Number of units in real estate property | storage_unit				65
2016 Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)				25.00%
2016 Joint Venture | Joint Venture | Unconsolidated properties
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)				25.00%
Number of self storage properties | property				81
Number of states in which self storage properties are located | state				13
Total rentable square feet in self storage properties | ft²				5.7
Number of units in real estate property | property				47,000

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Financial Position (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Self storage properties	$ 5,873,499	$ 5,864,134
Less accumulated depreciation	(1,095,918)	(1,051,638)
Self storage properties, net	4,777,581	4,812,496
Other assets	196,079	218,482
Total assets	5,255,004	5,354,462
LIABILITIES AND EQUITY
Debt financing	3,426,666	3,449,087
Equity	1,692,192	1,763,347	$ 1,947,072	$ 2,125,841
Total liabilities and equity	5,255,004	5,354,462
Joint Venture | Equity Method Investment, Nonconsolidated Investee or Group of Investees
ASSETS
Self storage properties	2,703,146	2,700,632
Less accumulated depreciation	(465,102)	(445,006)
Self storage properties, net	2,238,044	2,255,626
Other assets	35,884	43,513
Total assets	2,273,928	2,299,139
LIABILITIES AND EQUITY
Debt financing	1,213,458	1,213,169
Other liabilities	32,233	37,206
Equity	1,028,237	1,048,764
Total liabilities and equity	$ 2,273,928	$ 2,299,139

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Total revenue	$ 188,354	$ 196,148
Property operating expenses	(55,104)	(54,694)
Depreciation and amortization	(48,116)	(47,331)
Interest expense	(40,475)	(38,117)
Acquisition and integration costs	(2,445)	(507)
Net income attributable to National Storage Affiliates Trust	12,994	59,027
Joint Venture | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Related Party Transaction [Line Items]
Total revenue	61,624	56,096
Property operating expenses	(22,416)	(17,603)
Supervisory, administrative and other expenses	(4,041)	(3,658)
Depreciation and amortization	(21,644)	(18,206)
Interest expense	(13,645)	(12,100)
Acquisition and integration costs	(150)	(59)
Net income attributable to National Storage Affiliates Trust	$ (272)	$ 4,470

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ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) property
Asset Acquisition [Line Items]
Number of assets acquired, properties | property	3
Estimated fair value of net assets acquired	$ 13.5
Consideration transferred	0.1
Net gain on disposition	1.4
Land and Building
Asset Acquisition [Line Items]
Property, plant and equipment, additions	13.2
Customer in-place leases
Asset Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 0.3
Third Party
Asset Acquisition [Line Items]
Self storage property disposed | property	2
Net proceeds from sale	$ 9.8

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ACQUISITIONS AND DISPOSITIONS - Summary of Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) property
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Number of Properties | property	3
Cash and Acquisition Costs	$ 12,434
Value of Equity	0
Other	1,060
Total	$ 13,494

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OTHER ASSETS - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Receivables:
Accounts receivable	$ 6,835	$ 8,689
Property acquisition deposits	369	198
Interest rate swaps	12,249	22,596
Prepaid expenses and other	7,859	11,392
Corporate furniture, equipment and other, net	2,726	2,916
Goodwill	8,182	8,182
Total	$ 196,079	$ 218,482
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Total	Total
Related Party
Receivables:
Accounts receivable	$ 8,564	$ 10,169
Receivable from unconsolidated real estate ventures	4,853	8,057
Customer in-place leases
Other Assets
Intangibles	995	1,058
Accumulated amortization	777	380
Management contract
Other Assets
Intangibles	41,982	42,848
Accumulated amortization	9,983	9,117
Tenant reinsurance intangible
Other Assets
Intangibles	89,209	90,121
Accumulated amortization	7,176	6,264
Trade names
Receivables:
Trade names	$ 12,256	$ 12,256

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OTHER ASSETS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Customer in-place leases
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0.4	$ 1.0
Management contract
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1.3	0.3
Tenant reinsurance intangible
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0.9	$ 0.3

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DEBT FINANCING - Debt Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal amount	$ 3,436,060	$ 3,459,093
Unamortized debt issuance costs and debt premium, net	(9,394)	(10,006)
Total debt	$ 3,426,666	3,449,087
Line of Credit | Revolving line of credit | Credit Facility
Debt Instrument [Line Items]
Interest rate (percent)	5.71%
Principal amount	$ 420,800	443,300
Unsecured debt | May 2026 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	2.16%
Principal amount	$ 35,000	35,000
Unsecured debt | October 2026 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	6.46%
Principal amount	$ 65,000	65,000
Unsecured debt | July 2028 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Principal amount	$ 120,000	120,000
Unsecured debt | September 2028 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.40%
Principal amount	$ 75,000	75,000
Unsecured debt | October 2028 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	6.55%
Principal amount	$ 100,000	100,000
Unsecured debt | 2029 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.98%
Principal amount	$ 100,000	100,000
Unsecured debt | August 2030 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	2.99%
Principal amount	$ 150,000	150,000
Unsecured debt | October 2030 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	6.66%
Principal amount	$ 35,000	35,000
Unsecured debt | November 2030 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	2.72%
Principal amount	$ 75,000	75,000
Unsecured debt | May 2031 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.00%
Principal amount	$ 90,000	90,000
Unsecured debt | August 2031 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	4.08%
Principal amount	$ 50,000	50,000
Unsecured debt | September 2031 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.55%
Principal amount	$ 125,000	125,000
Unsecured debt | November 2031 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	2.81%
Principal amount	$ 175,000	175,000
Unsecured debt | August 2032 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.09%
Principal amount	$ 100,000	100,000
Unsecured debt | November 2032 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.06%
Principal amount	$ 200,000	200,000
Unsecured debt | May 2033 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.10%
Principal amount	$ 55,000	55,000
Unsecured debt | October 2033 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	6.73%
Principal amount	$ 50,000	50,000
Unsecured debt | November 2033 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	2.96%
Principal amount	$ 125,000	125,000
Unsecured debt | 2034 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.74%
Principal amount	$ 150,000	150,000
Unsecured debt | 2036 Senior Unsecured Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.06%
Principal amount	$ 75,000	75,000
Mortgages | Fixed Rate Mortgages
Debt Instrument [Line Items]
Interest rate (percent)	3.54%
Principal amount	$ 200,260	200,793
Secured Debt | 2028 Term loan facility
Debt Instrument [Line Items]
Interest rate (percent)	4.62%
Principal amount	$ 75,000	75,000
Secured Debt | April 2029 Term loan facility
Debt Instrument [Line Items]
Interest rate (percent)	4.27%
Principal amount	$ 100,000	100,000
Secured Debt | June 2029 Term loan facility
Debt Instrument [Line Items]
Interest rate (percent)	5.37%
Principal amount	$ 285,000	285,000
Secured Debt | Term loan D | Credit Facility
Debt Instrument [Line Items]
Interest rate (percent)	3.96%
Principal amount	$ 275,000	275,000
Secured Debt | Term loan E | Credit Facility
Debt Instrument [Line Items]
Interest rate (percent)	4.89%
Principal amount	$ 130,000	$ 130,000

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DEBT FINANCING - Narrative (Details) $ in Millions	Mar. 31, 2025 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,355.0
Credit Facility | Line of Credit
Debt Instrument [Line Items]
Borrowing capacity expansion	1,900.0
Credit Facility | Unsecured debt
Debt Instrument [Line Items]
Letters of credit outstanding	6.7
Revolving line of credit | Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	950.0
Revolving line of credit remaining borrowing capacity	522.5
Term loan D | Credit Facility | Unsecured debt
Debt Instrument [Line Items]
Maximum borrowing capacity	275.0
Term loan E | Credit Facility | Unsecured debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 130.0

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DEBT FINANCING - Future Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Scheduled Principal and Maturity Payments
Remainder of 2025	$ 1,651
2026	377,322
2027	638,169
2028	460,624
2029	487,789
2030	262,964
Thereafter	1,207,541
Total principal	3,436,060	$ 3,459,093
Amortization of Premium and Unamortized Debt Issuance Costs
Remainder of 2025	(1,928)
2026	(2,285)
2027	(1,664)
2028	(1,369)
2029	(649)
2030	(376)
Thereafter	(1,123)
Total amortization of premium and unamortized debt issuance costs	(9,394)	(10,006)
Total
Remainder of 2025	(277)
2026	375,037
2027	636,505
2028	459,255
2029	487,140
2030	262,588
Thereafter	1,206,418
Total debt	$ 3,426,666	$ 3,449,087

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EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator
Net income	$ 19,519	$ 95,088
Net income attributable to noncontrolling interests	(6,525)	(36,061)
Net income attributable to National Storage Affiliates Trust	12,994	59,027
Distributions to preferred shareholders	(5,114)	(5,110)
Distributed and undistributed earnings allocated to participating securities	(15)	(13)
Net income attributable to common shareholders - basic	7,865	53,904
Effect of assumed conversion of dilutive securities	0	35,218
Net income attributable to common shareholders - diluted	$ 7,865	$ 89,122
Denominator
Weighted average shares outstanding - basic (in shares)	76,372	80,236
Effect of dilutive securities:
Weighted average OP units outstanding (in shares)	0	37,633
Weighted average DownREIT OP unit equivalents outstanding (in shares)	0	2,120
Weighted average LTIP units outstanding (in shares)	0	128
Weighted average subordinated performance units and DownREIT subordinated performance unit equivalents (in shares)	0	18,031
Weighted average shares outstanding - diluted (in shares)	76,372	138,148
Earnings per share - basic (in dollars per share)	$ 0.10	$ 0.67
Earnings per share - diluted (in dollars per share)	$ 0.10	$ 0.65

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EARNINGS PER SHARE - Narrative (Details)	3 Months Ended
	Mar. 31, 2025 shares
NSA OP, LP | OP units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio	1
NSA OP, LP | LTIP units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio	1
DownREIT Partnership | OP units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio	1
LTIP units with vesting based on service or market condition
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity interests excluded from computation of diluted earnings per share (in shares)	779,408
OP units, DownREIT OP units, Subordinated performance units, DownREIT subordinated performance units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity interests excluded from computation of diluted earnings per share (in shares)	58,100,000

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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Payroll and related costs reimbursed to the PROs by the Company	$ 55,104	$ 54,694
Supervisory and Administrative Fee Agreement | Affiliate | Participating Regional Operator (PRO)
Related Party Transaction [Line Items]
Administrative expense	1,400	5,100
Payroll Services | Management | Participating Regional Operator (PRO)
Related Party Transaction [Line Items]
Payroll and related costs reimbursed to the PROs by the Company	$ 1,800	$ 6,900
Minimum | Supervisory and Administrative Fee Agreement | Management | Participating Regional Operator (PRO)
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent	5.00%
Maximum | Supervisory and Administrative Fee Agreement | Management | Participating Regional Operator (PRO)
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent		6.00%

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FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details) - Interest Rate Swap - Designated as Hedging Instrument $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) contract	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	$ 860,000		$ 1,085,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Contracts | contract	10		12
Notional Amount	$ 860,000		$ 1,085,000
Fair value, other assets, net	12,249		22,596
Fair value, interest rate swap liabilities	1,196		$ 471
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]
Fair value at beginning of period	22,125	$ 26,160
(Gains) and losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (loss)	(3,273)	(9,355)
Unrealized gains and realized (losses) on interest rate swaps and forward starting swaps included in accumulated other comprehensive income (loss)	(7,799)	20,413
Fair value of end of period	$ 11,053	$ 37,218

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 24, 2023	Mar. 31, 2025	Jun. 30, 2024	Dec. 31, 2024	Mar. 16, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months		$ (7.0)
Designated as Hedging Instrument | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount		$ 860.0		$ 1,085.0
Weighted average remaining term		3 years
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average fixed rate (percent)		3.08%
Designated as Hedging Instrument | Forward Starting Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	$ 25.0				$ 50.0
Interest rate (as a percent)					3.25%
Realized gain (loss), cash flow hedge			$ 1.6
Derivative term (in years)	10 years

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FAIR VALUE MEASUREMENTS - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private Placement Notes	$ 1,950,000	$ 1,950,000
Mortgage Notes	200,260	200,793
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private Placement Notes	1,815,416	1,774,291
Mortgage Notes	$ 193,394	$ 190,966

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SEGMENTS - Consolidated Financial Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Segment Reporting, Asset Reconciling Item [Line Items]
Rental revenue		$ 180,382
Reportable Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Rental revenue	$ 169,475	180,382
Total reportable segment revenue	176,219	187,074
Store payroll and related costs	12,914	13,523
Property tax expense	15,917	15,926
Utilities expense	5,724	5,422
Repairs & maintenance expense	5,003	4,297
Marketing expense	5,528	4,799
Insurance expense	2,689	2,751
Other property operating expenses	7,329	7,976
Total property operating expenses	55,104	54,694
Net operating income	121,115	132,380
Other property-related revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Other property-related revenue		6,692
Other property-related revenue | Reportable Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Other property-related revenue	$ 6,744	$ 6,692

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SEGMENTS - Reconciliation Of Reportable Segment Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Rental revenue		$ 180,382
Total revenue	$ 188,354	196,148
Other property-related revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue		6,692
Reportable Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Rental revenue	169,475	180,382
Total reportable segment revenue	176,219	187,074
Total revenue	188,354	196,148
Reportable Segment | Other property-related revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue	6,744	6,692
Reportable Segment | Management fees and other revenue
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue	$ 12,135	$ 9,074

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SEGMENTS - Net Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes	$ 20,639	$ 95,974
General and administrative expenses	13,145	15,674
Depreciation and amortization	48,116	47,331
Other	4,476	3,492
Interest expense	40,475	38,117
Equity in (losses) of unconsolidated real estate ventures	5,739	1,630
Non-operating income	(360)	(98)
Gain on sale of self storage properties	(1,425)	(61,173)
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes	20,639	95,974
General and administrative expenses	13,145	15,674
Depreciation and amortization	48,116	47,331
Other	4,476	3,492
Interest expense	40,475	38,117
Equity in (losses) of unconsolidated real estate ventures	5,739	1,630
Acquisition and integration costs	2,445	507
Non-operating income	(360)	(98)
Gain on sale of self storage properties	(1,425)	(61,173)
Net operating income	121,115	132,380
Reportable Segment | Management fees and other revenue
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Management fees and other revenue	$ (12,135)	$ (9,074)