CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
REVENUES
Rental income	$ 664,606	$ 630,725
Fee and asset management	1,765us-gaap_ManagementFeesRevenue	2,717us-gaap_ManagementFeesRevenue
Total revenues	666,371us-gaap_Revenues	633,442us-gaap_Revenues
EXPENSES
Property and maintenance	124,560	125,566
Real estate taxes and insurance	86,432us-gaap_RealEstateTaxesAndInsurance	82,094us-gaap_RealEstateTaxesAndInsurance
Property management	21,444us-gaap_OwnedPropertyManagementCosts	22,118us-gaap_OwnedPropertyManagementCosts
Fee and asset management	1,321us-gaap_ServiceManagementCosts	1,662us-gaap_ServiceManagementCosts
Depreciation	194,521us-gaap_Depreciation	185,167us-gaap_Depreciation
General and administrative	19,922us-gaap_GeneralAndAdministrativeExpense	17,576us-gaap_GeneralAndAdministrativeExpense
Total expenses	448,200us-gaap_CostsAndExpenses	434,183us-gaap_CostsAndExpenses
Operating Income	218,171us-gaap_OperatingIncomeLoss	199,259us-gaap_OperatingIncomeLoss
Interest and other income	120us-gaap_InterestAndOtherIncome	605us-gaap_InterestAndOtherIncome
Other expenses	70us-gaap_OtherNonoperatingExpense	(664)us-gaap_OtherNonoperatingExpense
Interest:
Expense incurred, net	(108,622)us-gaap_InterestExpenseDebt	(113,049)us-gaap_InterestExpenseDebt
Amortization of deferred financing costs	(2,589)us-gaap_AmortizationOfFinancingCosts	(2,792)us-gaap_AmortizationOfFinancingCosts
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations	107,150	83,359
Income and other tax (expense) benefit	(43)us-gaap_IncomeTaxExpenseBenefit	(240)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from investments in unconsolidated entities	2,963	(1,409)
Net gain on sales of real estate properties	79,951	0
Net (loss) on sales of land parcels	(1)eqr_GainLossOnSalesOfLandParcels	(30)eqr_GainLossOnSalesOfLandParcels
Income from continuing operations	190,020	81,680
Discontinued operations, net	204	1,052
Net income	190,224us-gaap_ProfitLoss	82,732us-gaap_ProfitLoss
Net (income) attributable to Noncontrolling Interests:
Net (income) attributable to Noncontrolling Interests - Operating Partnership	(7,059)	(3,093)
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties	(643)	(504)
Net income attributable to controlling interests	182,522us-gaap_NetIncomeLoss	79,135us-gaap_NetIncomeLoss
Preferred distributions	(891)us-gaap_DividendsPreferredStock	(1,036)us-gaap_DividendsPreferredStock
Premium on redemption of Preferred Shares	(2,789)us-gaap_RedemptionPremium	0us-gaap_RedemptionPremium
Net income available to Common Shares	$ 178,842	$ 78,099
Earnings per share - basic:
Income from continuing operations available to Common Shares	$ 0.492	$ 0.214
Net income available to Common Shares	$ 0.493us-gaap_EarningsPerShareBasic	$ 0.217us-gaap_EarningsPerShareBasic
Weighted average Common Shares outstanding	363,098	360,470
Earnings per share - diluted:
Income from continuing operations available to Common Shares	$ 0.488	$ 0.213
Net income available to Common Shares	$ 0.489us-gaap_EarningsPerShareDiluted	$ 0.216us-gaap_EarningsPerShareDiluted
Weighted average Common Shares outstanding	380,327	376,384
Distributions declared per Common Share outstanding	$ 0.5525	$ 0.50

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