Real Estate (Tables)

6 Months Ended

Jun. 30, 2011

Real Estate [Abstract]

Table of Real Estate Owned

	June 30,			December 31,
	2011			2010
Land	$	4,161,358		$	4,110,275
Depreciable property:
Buildings and improvements		13,833,714			13,995,121
Furniture, fixtures and equipment		1,212,536			1,231,391
Projects under development:
Land		26,766			28,260
Construction-in-progress		88,319			102,077
Land held for development:
Land		178,321			198,465
Construction-in-progress		36,174			36,782
Investment in real estate		19,537,188			19,702,371
Accumulated depreciation		(4,307,406	)		(4,337,357	)
Investment in real estate, net	$	15,229,782		$	15,365,014

Acquired Properties Table

	Properties		Apartment Units		Purchase Price
Rental Properties — Consolidated		7		2,069	$	549,253
Land Parcel (one)		—		—		12,850
Other (1)		—		—		11,750
Total		7		2,069	$	573,853

(1) Represents the acquisition of a 97,000 square foot commercial building adjacent to our Harbor Steps apartment property in downtown Seattle for potential redevelopment.

Disposed Properties Table

	Properties		Apartment Units		Sales Price
Rental Properties — Consolidated		38		11,267	$	1,173,314
Land Parcel (one) (1)		—		—		22,786
Total		38		11,267	$	1,196,100

(1) Represents the sale of a land parcel, on which the Company no longer planned to develop, in suburban Washington, D.C.