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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS
 3 Months Ended
Mar. 31, 2026
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, 2025 to March 31, 2026, was due to the issuance of 96,500 Series A Preferred Shares upon the redemption of an equivalent number of 6.000% Series A-1 preferred units. As of March 31, 2026 the Company had 9,133,217 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, 2026, the Company did not sell any common shares through the ATM program. As of March 31, 2026, 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, 2026 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, 2026 and December 31, 2025, units reflecting noncontrolling interests consisted of the following:
March 31, 2026December 31, 2025
Series A-1 preferred units1,096,711 1,193,211 
OP units51,074,863 51,321,262 
LTIP units933,045 850,663 
DownREIT units
DownREIT OP units5,769,214 5,769,214 
Total58,873,833 59,134,350 
Series A-1 Preferred Units
The Series A-1 preferred units rank senior to OP units in the 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, 2025 to March 31, 2026 was due to the redemption of 96,500 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, 2025 to March 31, 2026 was due to the redemption of 32,741 OP units for an equal number of common shares and the redemption of 302,615 OP units for cash, partially offset by the conversion of 88,957 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, 2025 to March 31, 2026 was due to the issuance of 171,339 compensatory LTIP units to employees and trustees, net of forfeitures. This increase was partially offset by the conversion of 88,957 LTIP units into an equivalent number of OP units.