Capital Structure (United Dominion Reality.L.P [Member])	6 Months Ended
	Jun. 30, 2011
United Dominion Reality.L.P [Member]
CAPITAL STRUCTURE	9. CAPITAL STRUCTURE General Partnership Units The General Partner has complete discretion to manage and control the operations and business of the Operating Partnership, which includes but is not limited to the acquisition and disposition of real property, construction of buildings and making capital improvements, and the borrowing of funds from outside lenders or UDR and its subsidiaries to finance such activities. The General Partner can generally authorize, issue, sell, redeem or purchase any OP Unit or securities of the Operating Partnership without the approval of the limited partners. The General Partner can also approve, with regard to the issuances of OP units, the class or one or more series of classes, with designations, preferences, participating, optional or other special rights, powers and duties including rights, powers and duties senior to limited partnership interests without approval of any limited partners except holder of Class A Partnership Units. There were 110,883 General Partnership units outstanding at June 30, 2011 and December 31, 2010, all of which were held by UDR. Limited Partnership Units At June 30, 2011 and December 31, 2010, there were 182,368,132 and 179,798,525 limited partnership units outstanding, of which 1,751,671 were Class A Limited Partnership units. UDR owned 174,738,456 or 95.8% at June 30, 2011 and 174,736,557 or 97.2% at December 31, 2010, respectively. The remaining 7,629,676 or 4.2% OP Units outstanding were held by non-affiliated partners at June 30, 2011 and 5,061,968 or 2.8% at December 31, 2010 of which 1,751,671, respectively, were Class A Limited Partnership units. The limited partners have the right to require the Operating Partnership to redeem all or a portion of the OP Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the Operating Partnership Agreement), provided that such OP Units have been outstanding for at least one year. UDR, as general partner of the Operating Partnership may, in its sole discretion, purchase the OP Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of UDR for each OP Unit), as defined in the Operating Partnership Agreement. The non-affiliated limited partners’ capital is adjusted to redemption value at the end of each reporting period with the corresponding offset against UDR’s limited partner capital account based on the redemption rights noted above. The aggregate value upon redemption of the then-outstanding OP Units held by limited partners was $187.3 million and $119.1 million as of June 30, 2011 and December 31, 2010, respectively, based on the value of UDR’s common stock at each period end. A limited partner has no right to receive any distributions from the Operating Partnership on or after the date of redemption of its OP Units. Class A Limited Partnership Units Class A Partnership units have a cumulative, annual, non-compounded preferred return, which is equal to 8% based on a value of $16.61 per Class A Partnership unit. Holders of the Class A Partnership Units exclusively possess certain voting rights. The Operating Partnership may not do the following without approval of the holders of the Class A Partnership Units: (i) increase the authorized or issued amount of Class A Partnership Units, (ii) reclassify any other partnership interest into Class A Partnership Units, (iii) create, authorize or issue any obligations or security convertible into or the right to purchase any Class Partnership units, without the approval of the holders of the Class A Partnership Units, (iv) enter into a merger or acquisition, or (v) amend or modify the Agreement of Limited Partnership of the Operating Partnership in a manner that adversely affects the relative rights, preferences or privileges of the Class A Partnership Units. Allocation of profits and losses Profit of the Operating Partnership is allocated in the following order: (i) to the General Partner and the Limited Partners in proportion to and up to the amount of cash distributions made during the year, and (ii) to the General Partner and Limited Partners in accordance with their percentage interests. Losses and depreciation and amortization expenses, non-recourse liabilities are allocated to the General Partner and Limited Partners in accordance with their percentage interests. Losses allocated to the Limited Partners are capped to the extent that such an allocation would not cause a deficit in the Limited Partners capital account. Such losses are, therefore, allocated to the General Partner. If any Partner’s capital balance were to fall into a deficit any income and gains are allocated to each Partner sufficient to eliminate its negative capital balance.

The entire disclosure for the formation, structure, control and ownership of the partnership. Disclosures related to accounts comprising partners' capital. Includes balances of general partners' capital account, limited partners' capital account, preferred partners' capital account and total partners' capital account and units outstanding; accumulated other comprehensive income; amount and nature of changes to amount of partner's capital and units outstanding by class, rights and privileges for each class of units; distribution policies and distributions paid by unit class; impact of and correction of an error in previously issued financial statements; limitations of partners' liability; redemption, conversion and distribution policies; and deferred compensation related to the issuance of units.

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