SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SIGNIFICANT ACCOUNTING POLICIES
Credit recoveries/(losses)	$ 213	$ (37,456)	$ (702)
Significant Accounting Policies
Recognition of operating lease right-of-use assets	4,422
Allocation of other comprehensive income/(loss)	(153)	(69)
Current income tax expense (benefit)	0
Net deferred tax assets/(liabilities)	$ (500)	(800)
Minimum period units are outstanding prior to redemption (in years)	1 year
Unrecognized tax benefit, accrued interest or penalties due to examination	$ 0
Advertising expense	10,300	10,000	9,200
Development costs excluding direct costs and capitalized interest	6,800	15,100	13,100
Interest capitalized during period	$ 8,600	9,300	10,100
Minimum percentage of carrying value of real estate portfolio	10.00%
Joint Venture and Partnership Investment
Significant Accounting Policies
UDR's ownership interest	100.00%
Buildings | Minimum
Significant Accounting Policies
Estimated useful lives	30 years
Buildings | Maximum
Significant Accounting Policies
Estimated useful lives	55 years
Building improvements | Minimum
Significant Accounting Policies
Estimated useful lives	10 years
Building improvements | Maximum
Significant Accounting Policies
Estimated useful lives	35 years
Furniture, fixtures, equipment, and other assets | Minimum
Significant Accounting Policies
Estimated useful lives	3 years
Furniture, fixtures, equipment, and other assets | Maximum
Significant Accounting Policies
Estimated useful lives	10 years
Non-related party
Significant Accounting Policies
Interest income	$ 19,200	24,200	14,500
Related party
Significant Accounting Policies
Interest income	0	0	0
Multifamily tenant lease
Significant Accounting Policies
Tenant leases receivable, net	5,700	5,900
Retail tenant lease
Significant Accounting Policies
Tenant leases receivable, net	700	300
Noncontrolling Interest
Significant Accounting Policies
Allocation of other comprehensive income/(loss)	$ (200)	$ (100)	$ (200)