CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 554,801		$ 100,681
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation expense	328,598	[1]	455,410	[1]
Depreciation expense from discontinued operations	0		13,154
Amortization of deferred financing costs	4,763		5,067
Amortization of debt premium	(26,271)		(20,898)
Loss on extinguishment of debt, net	412		0
Amortization of stock-based compensation	10,354		8,720
Equity in (income) loss of, and return on, unconsolidated real estate entities and noncontrolling interests, net of eliminations	2,911		45,215
Abandonment of development pursuits	1,455		0
Cash flow hedge losses reclassified to earnings	4,557		57,913
Gain on sale of real estate assets	(98,814)		(118,413)
Gain on Sale of Investments	(130,386)		(12,667)
Decrease (increase) in cash in operating escrows	771		(12,883)
Increase in resident security deposits, prepaid expenses and other assets	(12,808)		(66,709)
Increase in accrued expenses, other liabilities and accrued interest payable	1,086		15,333
Net cash provided by operating activities	641,429		469,923
Cash flows from investing activities:
Development/redevelopment of real estate assets including land acquisitions and deferred development costs	(861,466)		(908,215)
Acquisition of real estate assets, including partnership interest	0		(749,275)
Capital expenditures - existing real estate assets	(33,324)		(10,527)
Capital expenditures - non-real estate assets	(5,776)		(7,286)
Proceeds from sale of real estate, net of selling costs	186,651		432,380
Mortgage note receivable repayment	21,748		0
Increase in payables for construction	3,463		31,124
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	192,209		16,788
Net cash used in investing activities	(496,495)		(1,195,011)
Cash flows from financing activities:
Issuance of common stock	340,091		2,874
Dividends paid	(440,632)		(387,658)
Issuance of mortgage notes payable	53,000		71,210
Repayments of mortgage notes payable, including prepayment penalties	(28,718)		(1,789,399)
Settlement of interest rate contract	0		(51,000)
Issuance of unsecured notes	250,000		400,000
Repayment of unsecured notes	(150,000)		(100,000)
Payment of deferred financing costs	(3,414)		(6,093)
Acquisition of joint venture partner equity interest	0		(1,965)
Distributions to DownREIT partnership unitholders	(26)		(24)
Distributions to joint venture and profit-sharing partners	(262)		(238)
Redemption of preferred interest obligation	(6,300)		(33,327)
Net cash provided by (used in) financing activities	13,739		(1,895,620)
Net increase (decrease) in cash and cash equivalents	158,673		(2,620,708)
Cash and cash equivalents, beginning of period	281,355		2,733,618
Cash and cash equivalents, end of period	440,028		112,910
Cash paid during the period for interest, net of amount capitalized	$ 154,653		$ 137,081

[1] Includes amounts associated with assets sold or held for sale, not classified as discontinued operations.