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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) | 9 Months Ended
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Sep. 30, 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.
Correction of Immaterial Error | Correction of Immaterial Error In connection with preparing its financial statements as of and for the year ended December 31, 2024, the Company identified an immaterial error in its presentation of the effect of changes in ownership for consolidated entities, including the effect of such changes resulting from the internalization of the PRO structure and the redemption of OP units, on Additional Paid-in Capital, Accumulated Other Comprehensive Income (Loss) attributable to Common Shares, and Noncontrolling Interests, as presented on its Condensed Consolidated Statements of Changes in Equity and on its Condensed Consolidated Balance Sheets, as of and for the three months ended September 30, 2024, in the financial statements included in the Quarterly Report on Form 10-Q filed with the SEC on October 31, 2024. The Company has corrected the immaterial error in the accompanying Condensed Consolidated Statements of Changes in Equity for the three months ended September 30, 2024. The correction of the immaterial error resulted in a $112.1 million increase to Total Shareholders’ Equity (consisting of an increase in Additional Paid-in Capital of $125.6 million and a decrease in Accumulated Other Comprehensive Income of $13.5 million) and a corresponding $112.1 million decrease to Noncontrolling Interests. This correction had no impact on Total Equity in the Consolidated Statements of Changes in Equity, the Consolidated Statements of Cash Flows or Net Income for any interim or annual periods. Based on the Company's analysis considering Staff Accounting Bulletin ("SAB") No. 99 "Materiality," the Company determined that this error was immaterial to the previously issued consolidated financial statements.
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, 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 September 30, 2025 and 2024, the Company recognized $5.7 million and $6.3 million, respectively, of tenant insurance and tenant warranty protection plan revenues and during nine months ended September 30, 2025 and 2024, the Company recognized $17.5 million and $17.1 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 September 30, 2025 and 2024, the Company recognized retail sales of $0.4 million and $0.5 million, respectively and during the nine months ended September 30, 2025 and 2024, the Company recognized retail sales of $1.2 million and $1.5 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 September 30, 2025 and 2024, the Company recognized property management fees, call center fees and platform fees of $4.7 million and $4.7 million, respectively, and during the nine months ended September 30, 2025 and 2024, the Company recognized property management fees, call center fees and platform fees of $14.1 million and $13.5 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 September 30, 2025 and 2024, the Company recognized acquisition fees of $0.2 million and $0.6 million, respectively and during the nine months ended September 30, 2025 and 2024, the Company recognized acquisition fees of $0.3 million and $0.6 million, respectively. 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 September 30, 2025 and 2024, the Company recognized $7.0 million and $6.1 million, respectively, of revenue related to these activities and during the nine months ended September 30, 2025 and 2024, the Company recognized $21.3 million and $15.6 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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