CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
REVENUES
Rental income	$ 630,725,000	$ 502,562,000
Fee and asset management	2,717,000	2,160,000
Total revenues	633,442,000	504,722,000
EXPENSES
Property and maintenance	125,573,000	98,529,000
Real estate taxes and insurance	82,094,000	65,095,000
Property management	22,118,000	22,489,000
Fee and asset management	1,662,000	1,646,000
Depreciation	185,167,000	196,222,000
General and administrative	17,576,000	16,495,000
Total expenses	434,190,000	400,476,000
Operating Income	199,252,000	104,246,000
Interest and other income	605,000	320,000
Other expenses	(657,000)	(21,719,000)
Interest:
Expense incurred, net	(113,049,000)	(194,467,000)
Amortization of deferred financing costs	(2,792,000)	(6,948,000)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net (loss) on sales of land parcels and discontinued operations	83,359,000	(118,568,000)
Income and other tax (expense) benefit	(222,000)	(405,000)
(Loss) from investments in unconsolidated entities	(1,409,000)	(46,366,000)
Net (loss) on sales of land parcels	(30,000)	0
Income (loss) from continuing operations	81,698,000	(165,339,000)
Discontinued operations, net	1,034,000	1,226,373,000
Net income	82,732,000	1,061,034,000
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties	(504,000)	(25,000)
Net income attributable to controlling interests	79,135,000	1,017,686,000
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.214	$ (0.473)
Net income available to Units	$ 0.217	$ 3.012
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.213	$ (0.473)
Net income available to Units	$ 0.216	$ 3.012
OPERATING PARTNERSHIP
REVENUES
Rental income	630,725,000	502,562,000
Fee and asset management	2,717,000	2,160,000
Total revenues	633,442,000	504,722,000
EXPENSES
Property and maintenance	125,573,000	98,529,000
Real estate taxes and insurance	82,094,000	65,095,000
Property management	22,118,000	22,489,000
Fee and asset management	1,662,000	1,646,000
Depreciation	185,167,000	196,222,000
General and administrative	17,576,000	16,495,000
Total expenses	434,190,000	400,476,000
Operating Income	199,252,000	104,246,000
Interest and other income	605,000	320,000
Other expenses	(657,000)	(21,719,000)
Interest:
Expense incurred, net	(113,049,000)	(194,467,000)
Amortization of deferred financing costs	(2,792,000)	(6,948,000)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net (loss) on sales of land parcels and discontinued operations	83,359,000	(118,568,000)
Income and other tax (expense) benefit	(222,000)	(405,000)
(Loss) from investments in unconsolidated entities	(1,409,000)	(46,366,000)
Net (loss) on sales of land parcels	(30,000)	0
Income (loss) from continuing operations	81,698,000	(165,339,000)
Discontinued operations, net	1,034,000	1,226,373,000
Net income	82,732,000	1,061,034,000
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties	(504,000)	(25,000)
Net income attributable to controlling interests	82,228,000	1,061,009,000
ALLOCATION OF NET INCOME:
Preference Units	1,036,000	1,036,000
General Partner	78,099,000	1,016,650,000
Limited Partners	3,093,000	43,323,000
Net income available to Units	$ 81,192,000	$ 1,059,973,000
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.214	$ (0.473)
Net income available to Units	$ 0.217	$ 3.012
Weighted average Units outstanding	374,201	351,255
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.213	$ (0.473)
Net income available to Units	$ 0.216	$ 3.012
Weighted average Units outstanding	376,384	351,255
Distributions declared per Unit outstanding	$ 0.50	$ 0.40