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Consolidation and Basis of Presentation (Details)	Sep. 30, 2011
Consolidation And Basis Of Presentation (Textual) [Abstract]
Operating Partnership outstanding units	184,281,254
OP units outstanding related to general partner	174,851,898
Percentage of units owned by UDR	94.90%
OP units outstanding related to limited partner	9,429,356
Percentage of units outstanding in Heritage OP	5.10%

- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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