EARNINGS PER SHARE - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 shares	Dec. 31, 2024 shares
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 units)	686,739
OP units, DownREIT OP units, Subordinated performance units, DownREIT subordinated performance units, Vested LTIP units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity interests excluded from computation of diluted earnings per share (in units)	57,800,000	58,200,000
OP units | NSA OP, LP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity Instrument, Convertible, Conversion Ratio	1
OP units | DownREIT Partnership
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity Instrument, Convertible, Conversion Ratio	1
LTIP units | NSA OP, LP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity Instrument, Convertible, Conversion Ratio	1