COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Mar. 31, 2024 USD ($) community
Real estate properties
Number of communities | community	168
Costs Incurred to Date	$ 234,723
UDR's Remaining Commitment	170,224
Real estate technology investments
Real estate properties
Costs Incurred to Date	57,140
UDR's Remaining Commitment	$ 48,860
Wholly owned - under development
Real estate properties
Number of communities | community	1
Costs Incurred to Date	$ 126,163
UDR's Remaining Commitment	$ 7,837
Wholly owned - redevelopment
Real estate properties
Number of communities | community	10
Costs Incurred to Date	$ 51,420
UDR's Remaining Commitment	$ 113,527