10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended SEPTEMBER 30, 2011

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File Number: 1-12252 (Equity Residential)

Commission File Number: 0-24920 (ERP Operating Limited Partnership)

EQUITY RESIDENTIAL

ERP OPERATING LIMITED PARTNERSHIP

(Exact name of Registrant as Specified in Its Charter)

Maryland (Equity Residential)	13-3675988 (Equity Residential)
Illinois (ERP Operating Limited Partnership)	36-3894853 (ERP Operating Limited Partnership)
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
Two North Riverside Plaza, Chicago, Illinois 60606	(312) 474-1300
(Address of Principal Executive Offices) (Zip Code)	(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Equity Residential    Yes  x    No  ¨        ERP Operating Limited Partnership    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Equity Residential    Yes  x    No  ¨        ERP Operating Limited Partnership    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Equity Residential:

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

ERP Operating Limited Partnership:

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Equity Residential    Yes  ¨    No  x        ERP Operating Limited Partnership    Yes  ¨    No  x

The number of EQR Common Shares of Beneficial Interest, $0.01 par value, outstanding on October 27, 2011 was 296,628,624.

EXPLANATORY NOTE

This report combines the reports on Form 10-Q for the quarterly period ended September 30, 2011 of Equity Residential and ERP Operating Limited Partnership. Unless stated otherwise or the context otherwise requires, references to “EQR” mean Equity Residential, a Maryland real estate investment trust (“REIT”), and references to “ERPOP” mean ERP Operating Limited Partnership, an Illinois limited partnership. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP. The following chart illustrates the Company’s and the Operating Partnership’s corporate structure:

EQR is the general partner of, and as of September 30, 2011 owned an approximate 95.6% ownership interest in ERPOP. The remaining 4.4% interest is owned by limited partners. As the sole general partner of ERPOP, EQR has exclusive control of ERPOP’s day-to-day management.

The Company is structured as an umbrella partnership REIT (“UPREIT”) and contributes all net proceeds from its various equity offerings to the Operating Partnership. In return for those contributions, the Company receives a number of OP Units (see definition below) in the Operating Partnership equal to the number of Common Shares it has issued in the equity offering. Contributions of properties to the Company can be structured as tax-deferred transactions through the issuance of OP Units in the Operating Partnership. Based on the terms of ERPOP’s partnership agreement, OP Units can be exchanged with Common Shares on a one-for-one basis. The Company maintains a one-for-one relationship between the OP Units of the Operating Partnership issued to EQR and the Common Shares issued to the public.

The Company believes that combining the reports on Form 10-Q of EQR and ERPOP into this single report provides the following benefits:

• enhances investors’ understanding of the Company and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business;

• eliminates duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the disclosure applies to both the Company and the Operating Partnership; and

• creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.

Management operates the Company and the Operating Partnership as one business. The management of EQR consists of the same members as the management of ERPOP.

The Company believes it is important to understand the few differences between EQR and ERPOP in the context of how EQR and ERPOP operate as a consolidated company. All of the Company’s property ownership, development and related business operations are conducted through the Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR’s primary function is acting as the general partner of ERPOP. EQR also issues public equity from time to time and guarantees certain debt of ERPOP, as disclosed in this report. EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for the net proceeds from equity offerings by the Company, which are contributed to the capital of the Operating Partnership in exchange for additional limited partnership interests in the Operating Partnership (“OP Units”) (on a one-for-one Common Share per OP Unit basis), the Operating Partnership generates all remaining capital required by the Company’s business. These sources include the Operating Partnership’s working capital, net cash provided by operating activities, borrowings under its revolving credit facility, the issuance of secured and unsecured debt and equity securities, including additional OP Units, and proceeds received from disposition of certain properties and joint ventures.

Shareholders’ equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of the Company and those of the Operating Partnership. The limited partners of the Operating Partnership are accounted for as partners’ capital in the Operating Partnership’s financial statements and as noncontrolling interests in the Company’s financial statements. The noncontrolling interests in the Operating Partnership’s financial statements include the interests of unaffiliated partners in various consolidated partnerships and development joint venture partners. The noncontrolling interests in the Company’s financial statements include the same noncontrolling interests at the Operating Partnership level and limited partner OP Unit holders of the Operating Partnership. The differences between shareholders’ equity and partners’ capital result from differences in the equity issued at the Company and Operating Partnership levels.

To help investors understand the significant differences between the Company and the Operating Partnership, this report provides separate consolidated financial statements for the Company and the Operating Partnership; a single set of consolidated notes to such financial statements that includes separate discussions of each entity’s debt, noncontrolling interests and shareholders’ equity or partners’ capital, as applicable; and a combined Management’s Discussion and Analysis of Financial Condition and Results of Operations section that includes discrete information related to each entity.

This report also includes separate Part I, Item 4. Controls and Procedures sections and separate Exhibits 31 and 32 certifications for each of the Company and the Operating Partnership in order to establish that the requisite certifications have been made and that the Company and the Operating Partnership are compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934 and 18 U.S.C. §1350.

In order to highlight the differences between the Company and the Operating Partnership, the separate sections in this report for the Company and the Operating Partnership specifically refer to the Company and the Operating Partnership. In the sections that combine disclosure of the Company and the Operating Partnership, this report refers to actions or holdings as being actions or holdings of the Company. Although the Operating Partnership is generally the entity that directly or indirectly enters into contracts and joint ventures and holds assets and debt, reference to the Company is appropriate because the Company is one business and the Company operates that business through the Operating Partnership.

As general partner with control of the Operating Partnership, the Company consolidates the Operating Partnership for financial reporting purposes, and EQR essentially has no assets or liabilities other than its investment in ERPOP. Therefore, the assets and liabilities of the Company and the Operating Partnership are the same on their respective financial statements. The separate discussions of the Company and the Operating Partnership in this report should be read in conjunction with each other to understand the results of the Company on a consolidated basis and how management operates the Company.

TABLE OF CONTENTS

	PAGE
PART I.
Item 1. Financial Statements of Equity Residential:
Consolidated Balance Sheets as of September 30, 2011 and December 31, 2010		2
Consolidated Statements of Operations for the nine months and quarters ended September 30, 2011 and 2010		3 to 4
Consolidated Statements of Cash Flows for the nine months ended September 30, 2011 and 2010		5 to 7
Consolidated Statement of Changes in Equity for the nine months ended September 30, 2011		8 to 9
Financial Statements of ERP Operating Limited Partnership:
Consolidated Balance Sheets as of September 30, 2011 and December 31, 2010		10
Consolidated Statements of Operations for the nine months and quarters ended September 30, 2011 and 2010		11 to 12
Consolidated Statements of Cash Flows for the nine months ended September 30, 2011 and 2010		13 to 15
Consolidated Statement of Changes in Capital for the nine months ended September 30, 2011		16 to 17
Notes to Consolidated Financial Statements of Equity Residential and ERP Operating Limited Partnership		18 to 40
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations		41 to 61
Item 3. Quantitative and Qualitative Disclosures about Market Risk		61
Item 4. Controls and Procedures		62
PART II.
Item 1. Legal Proceedings		63
Item 1A. Risk Factors		63
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds		63
Item 6. Exhibits		63

EQUITY RESIDENTIAL

CONSOLIDATED BALANCE SHEETS

(Amounts in thousands except for share amounts)

(Unaudited)

	September 30, 2011			December 31, 2010
ASSETS
Investment in real estate
Land	$	4,158,288		$	4,110,275
Depreciable property		15,055,570			15,226,512
Projects under development		119,433			130,337
Land held for development		205,476			235,247
Investment in real estate		19,538,767			19,702,371
Accumulated depreciation		(4,405,479	)		(4,337,357	)
Investment in real estate, net		15,133,288			15,365,014
Cash and cash equivalents		45,986			431,408
Investments in unconsolidated entities		11,020			3,167
Deposits – restricted		369,461			180,987
Escrow deposits – mortgage		10,677			12,593
Deferred financing costs, net		37,334			42,033
Other assets		149,051			148,992
Total assets	$	15,756,817		$	16,184,194
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable	$	4,136,848		$	4,762,896
Notes, net		4,614,323			5,185,180
Lines of credit		26,000			—
Accounts payable and accrued expenses		97,845			39,452
Accrued interest payable		69,895			98,631
Other liabilities		409,591			304,202
Security deposits		62,073			60,812
Distributions payable		106,673			140,905
Total liabilities		9,523,248			10,592,078
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership		378,798			383,540
Equity:
Shareholders’ equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,600,000 shares issued and outstanding as of September 30, 2011 and December 31, 2010		200,000			200,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 296,620,833 shares issued and outstanding as of September 30, 2011 and 290,197,242 shares issued and outstanding as of December 31, 2010		2,966			2,902
Paid in capital		5,032,863			4,741,521
Retained earnings		684,902			203,581
Accumulated other comprehensive (loss)		(185,032	)		(57,818	)
Total shareholders’ equity		5,735,699			5,090,186
Noncontrolling Interests:
Operating Partnership		120,786			110,399
Partially Owned Properties		(1,714	)		7,991
Total Noncontrolling Interests		119,072			118,390
Total equity		5,854,771			5,208,576
Total liabilities and equity	$	15,756,817		$	16,184,194

See accompanying notes

2

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENTS OF OPERATIONS

(Amounts in thousands except per share data)

(Unaudited)

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
REVENUES
Rental income	$	1,470,398		$	1,311,377		$	509,030		$	451,832
Fee and asset management		6,682			7,596			2,928			2,128
Total revenues		1,477,080			1,318,973			511,958			453,960
EXPENSES
Property and maintenance		314,768			303,916			106,635			104,259
Real estate taxes and insurance		168,056			160,307			59,083			56,205
Property management		62,389			59,770			19,241			19,014
Fee and asset management		3,207			4,242			1,250			679
Depreciation		482,039			457,822			164,552			158,318
General and administrative		32,462			31,029			10,121			10,221
Total expenses		1,062,921			1,017,086			360,882			348,696
Operating income		414,159			301,887			151,076			105,264
Interest and other income		6,608			5,045			5,317			201
Other expenses		(9,318	)		(9,513	)		(2,528	)		(3,487	)
Interest:
Expense incurred, net		(354,960	)		(348,279	)		(113,370	)		(121,116	)
Amortization of deferred financing costs		(12,129	)		(7,729	)		(4,721	)		(2,437	)
Income (loss) before income and other taxes, (loss) income from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entites and land parcels and discontinued operations		44,360			(58,589	)		35,774			(21,575	)
Income and other tax (expense) benefit		(669	)		(283	)		(283	)		(291	)
(Loss) income from investments in unconsolidated entities		—			(735	)		—			188
Net gain on sales of unconsolidated entities		—			28,101			—			22,544
Net gain (loss) on sales of land parcels		4,217			(1,161	)		—			(1,161	)
Income (loss) from continuing operations		47,908			(32,667	)		35,491			(295	)
Discontinued operations, net		779,888			130,438			77,486			30,121
Net income		827,796			97,771			112,977			29,826
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership		(36,275	)		(4,167	)		(4,742	)		(1,231	)
Partially Owned Properties		(418	)		623			(387	)		188
Net income attributable to controlling interests		791,103			94,227			107,848			28,783
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Net income available to Common Shares	$	780,704		$	83,372		$	104,382		$	25,166
Earnings per share – basic:
Income (loss) from continuing operations available to Common Shares	$	0.12		$	(0.15	)	$	0.10		$	(0.01	)
Net income available to Common Shares	$	2.65		$	0.30		$	0.35		$	0.09
Weighted average Common Shares outstanding		294,474			281,867			295,831			282,717
Earnings per share – diluted:
Income (loss) from continuing operations available to Common Shares	$	0.12		$	(0.15	)	$	0.10		$	(0.01	)
Net income available to Common Shares	$	2.62		$	0.30		$	0.35		$	0.09
Weighted average Common Shares outstanding		311,908			281,867			312,844			282,717
Distributions declared per Common Share outstanding	$	1.0125		$	1.0125		$	0.3375		$	0.3375

See accompanying notes

3

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENTS OF OPERATIONS (Continued)

(Amounts in thousands except per share data)

(Unaudited)

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Comprehensive income (loss):
Net income	$	827,796		$	97,771		$	112,977		$	29,826
Other comprehensive (loss):
Other comprehensive (loss) – derivative instruments:
Unrealized holding (losses) arising during the period		(130,367	)		(123,472	)		(105,248	)		(37,726	)
Losses reclassified into earnings from other comprehensive income		2,842			2,379			951			914
Other comprehensive income (loss) – other instruments:
Unrealized holding gains (losses) arising during the period		311			(52	)		(182	)		14
Other comprehensive (loss)		(127,214	)		(121,145	)		(104,479	)		(36,798	)
Comprehensive income (loss)		700,582			(23,374	)		8,498			(6,972	)
Comprehensive (income) attributable to Noncontrolling Interests		(36,693	)		(3,544	)		(5,129	)		(1,043	)
Comprehensive income (loss) attributable to controlling interests	$	663,889		$	(26,918	)	$	3,369		$	(8,015	)

See accompanying notes

4

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	827,796		$	97,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		496,383			501,695
Amortization of deferred financing costs		12,769			7,981
Amortization of discounts and premiums on debt		144			1,454
Amortization of deferred settlements on derivative instruments		2,441			1,978
Write-off of pursuit costs		4,052			3,512
Income from technology investments		(4,537	)		—
Loss from investments in unconsolidated entities		—			735
Distributions from unconsolidated entities – return on capital		318			61
Net (gain) on sales of unconsolidated entities		—			(28,101	)
Net (gain) loss on sales of land parcels		(4,217	)		1,161
Net (gain) on sales of discontinued operations		(759,100	)		(69,538	)
Loss on debt extinguishments		—			158
Unrealized loss on derivative instruments		—			1
Compensation paid with Company Common Shares		16,722			14,716
Changes in assets and liabilities:
Decrease in deposits – restricted		5,101			75
Decrease (increase) in other assets		3,239			(6,385	)
Increase in accounts payable and accrued expenses		60,608			66,070
(Decrease) in accrued interest payable		(28,736	)		(31,257	)
(Decrease) in other liabilities		(20,193	)		(4,150	)
Increase in security deposits		1,261			2,744
Net cash provided by operating activities		614,051			560,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(634,581	)		(1,108,014	)
Investment in real estate – development/other		(93,761	)		(98,282	)
Improvements to real estate		(106,070	)		(98,959	)
Additions to non-real estate property		(4,879	)		(1,022	)
Interest capitalized for real estate and unconsolidated entities under development		(5,931	)		(10,196	)
Proceeds from disposition of real estate, net		1,402,475			134,603
Investments in unconsolidated entities		(865	)		—
Distributions from unconsolidated entities – return of capital		—			26,924
Proceeds from sale of investment securities		—			25,000
Proceeds from technology investments		4,537			—
(Increase) decrease in deposits on real estate acquisitions, net		(210,170	)		248,547
Decrease (increase) in mortgage deposits		1,916			(2,340	)
Consolidation of previously unconsolidated properties		—			(26,854	)
Deconsolidation of previously consolidated properties		28,360			—
Acquisition of Noncontrolling Interests – Partially Owned Properties		(12,809	)		(1,936	)
Net cash provided by (used for) investing activities		368,222			(912,529	)

See accompanying notes

5

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
CASH FLOWS FROM FINANCING ACTIVITIES:
Loan and bond acquisition costs	$	(8,070	)	$	(7,897	)
Mortgage notes payable:
Proceeds		152,930			124,020
Restricted cash		16,595			36,411
Lump sum payoffs		(859,066	)		(491,100	)
Scheduled principal repayments		(12,463	)		(12,508	)
(Loss) on debt extinguishments		—			(158	)
Notes, net:
Proceeds		—			595,422
Lump sum payoffs		(575,641	)		—
Lines of credit:
Proceeds		213,000			4,375,125
Repayments		(187,000	)		(4,229,125	)
(Payments on) settlement of derivative instruments		—			(10,040	)
Proceeds from sale of Common Shares		154,508			73,356
Proceeds from Employee Share Purchase Plan (ESPP)		4,558			4,251
Proceeds from exercise of options		94,373			57,933
Common Shares repurchased and retired		—			(1,887	)
Payment of offering costs		(2,770	)		(730	)
Other financing activities, net		(33	)		(33	)
Contributions – Noncontrolling Interests – Partially Owned Properties		64			222
Distributions:
Common Shares		(331,928	)		(284,185	)
Preferred Shares		(10,399	)		(10,858	)
Noncontrolling Interests – Operating Partnership		(15,464	)		(14,187	)
Noncontrolling Interests – Partially Owned Properties		(889	)		(1,812	)
Net cash (used for) provided by financing activities		(1,367,695	)		202,220
Net (decrease) in cash and cash equivalents		(385,422	)		(149,628	)
Cash and cash equivalents, beginning of period		431,408			193,288
Cash and cash equivalents, end of period	$	45,986		$	43,660

See accompanying notes

6

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	$	381,194		$	377,467
Net cash paid (received) for income and other taxes	$	607		$	(2,892	)
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	$	99,131		$	338,196
Valuation of OP Units issued	$	—		$	7,433
Mortgage loans (assumed) by purchaser	$	—		$	(39,999	)
Amortization of deferred financing costs:
Investment in real estate, net	$	—		$	(1,824	)
Deferred financing costs, net	$	12,769		$	9,805
Amortization of discounts and premiums on debt:
Mortgage notes payable	$	(6,116	)	$	(5,048	)
Notes, net	$	6,260		$	6,502
Amortization of deferred settlements on derivative instruments:
Other liabilities	$	(401	)	$	(401	)
Accumulated other comprehensive income	$	2,842		$	2,379
Unrealized loss on derivative instruments:
Other assets	$	5,217		$	13,788
Mortgage notes payable	$	(464	)	$	6
Notes, net	$	(1,476	)	$	9,835
Other liabilities	$	127,090		$	99,844
Accumulated other comprehensive (loss)	$	(130,367	)	$	(123,472	)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	$	(5,760	)	$	(10,196	)
Investments in unconsolidated entities	$	(171	)	$	—
Consolidation of previously unconsolidated properties:
Investment in real estate, net	$	—		$	(105,065	)
Investments in unconsolidated entities	$	—		$	7,376
Deposits – restricted	$	—		$	(42,633	)
Mortgage notes payable	$	—		$	112,631
Net other assets recorded	$	—		$	837
Deconsolidation of previously consolidated properties:
Investment in real estate, net	$	35,495		$	—
Investments in unconsolidated entities	$	(7,135	)	$	—
(Payments on) settlement of derivative instruments:
Other liabilities	$	—		$	(10,040	)
Other:
Receivable on sale of Common Shares	$	—		$	37,550
Transfer from notes, net to mortgage notes payable	$	—		$	35,600

See accompanying notes

7

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30, 2011
SHAREHOLDERS’ EQUITY
PREFERRED SHARES
Balance, beginning of year	$	200,000
Balance, end of period	$	200,000
COMMON SHARES, $0.01 PAR VALUE
Balance, beginning of year	$	2,902
Conversion of OP Units into Common Shares		3
Issuance of Common Shares		30
Exercise of share options		29
Employee Share Purchase Plan (ESPP)		1
Conversion of restricted shares to LTIP Units		(1	)
Share-based employee compensation expense:
Restricted shares		2
Balance, end of period	$	2,966
PAID IN CAPITAL
Balance, beginning of year	$	4,741,521
Common Share Issuance:
Conversion of OP Units into Common Shares		8,092
Issuance of Common Shares		154,478
Exercise of share options		94,344
Employee Share Purchase Plan (ESPP)		4,557
Conversion of restricted shares to LTIP Units		(3,933	)
Share-based employee compensation expense:
Restricted shares		7,275
Share options		7,389
ESPP discount		1,070
Offering costs		(2,770	)
Supplemental Executive Retirement Plan (SERP)		10,198
Acquisition of Noncontrolling Interests – Partially Owned Properties		(4,784	)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership		16,023
Adjustment for Noncontrolling Interests ownership in Operating Partnership		(597	)
Balance, end of period	$	5,032,863
RETAINED EARNINGS
Balance, beginning of year	$	203,581
Net income attributable to controlling interests		791,103
Common Share distributions		(299,383	)
Preferred Share distributions		(10,399	)
Balance, end of period	$	684,902
ACCUMULATED OTHER COMPREHENSIVE (LOSS)
Balance, beginning of year	$	(57,818	)
Accumulated other comprehensive (loss) – derivative instruments:
Unrealized holding (losses) arising during the period		(130,367	)
Losses reclassified into earnings from other comprehensive income		2,842
Accumulated other comprehensive income – other instruments:
Unrealized holding gains arising during the period		311
Balance, end of period	$	(185,032	)

See accompanying notes

8

EQUITY RESIDENTIAL

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30, 2011
NONCONTROLLING INTERESTS
OPERATING PARTNERSHIP
Balance, beginning of year	$	110,399
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner		(8,095	)
Conversion of restricted shares to LTIP Units		3,934
Equity compensation associated with Noncontrolling Interests		2,734
Net income attributable to Noncontrolling Interests		36,275
Distributions to Noncontrolling Interests		(13,777	)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership		(11,281	)
Adjustment for Noncontrolling Interests ownership in Operating Partnership		597
Balance, end of period	$	120,786
PARTIALLY OWNED PROPERTIES
Balance, beginning of year	$	7,991
Net income attributable to Noncontrolling Interests		418
Contributions by Noncontrolling Interests		64
Distributions to Noncontrolling Interests		(922	)
Acquisition of Noncontrolling Interests – Partially Owned Properties		(8,025	)
Other		(1,240	)
Balance, end of period	$	(1,714	)

See accompanying notes

9

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED BALANCE SHEETS

(Amounts in thousands)

(Unaudited)

	September 30, 2011			December 31, 2010
ASSETS
Investment in real estate
Land	$	4,158,288		$	4,110,275
Depreciable property		15,055,570			15,226,512
Projects under development		119,433			130,337
Land held for development		205,476			235,247
Investment in real estate		19,538,767			19,702,371
Accumulated depreciation		(4,405,479	)		(4,337,357	)
Investment in real estate, net		15,133,288			15,365,014
Cash and cash equivalents		45,986			431,408
Investments in unconsolidated entities		11,020			3,167
Deposits – restricted		369,461			180,987
Escrow deposits – mortgage		10,677			12,593
Deferred financing costs, net		37,334			42,033
Other assets		149,051			148,992
Total assets	$	15,756,817		$	16,184,194
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable	$	4,136,848		$	4,762,896
Notes, net		4,614,323			5,185,180
Lines of credit		26,000			—
Accounts payable and accrued expenses		97,845			39,452
Accrued interest payable		69,895			98,631
Other liabilities		409,591			304,202
Security deposits		62,073			60,812
Distributions payable		106,673			140,905
Total liabilities		9,523,248			10,592,078
Commitments and contingencies
Redeemable Limited Partners		378,798			383,540
Capital:
Partners’ Capital:
Preference Units		200,000			200,000
General Partner		5,720,731			4,948,004
Limited Partners		120,786			110,399
Accumulated other comprehensive (loss)		(185,032	)		(57,818	)
Total partners’ capital		5,856,485			5,200,585
Noncontrolling Interests – Partially Owned Properties		(1,714	)		7,991
Total capital		5,854,771			5,208,576
Total liabilities and capital	$	15,756,817		$	16,184,194

See accompanying notes

10

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF OPERATIONS

(Amounts in thousands except per Unit data)

(Unaudited)

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
REVENUES
Rental income	$	1,470,398		$	1,311,377		$	509,030		$	451,832
Fee and asset management		6,682			7,596			2,928			2,128
Total revenues		1,477,080			1,318,973			511,958			453,960
EXPENSES
Property and maintenance		314,768			303,916			106,635			104,259
Real estate taxes and insurance		168,056			160,307			59,083			56,205
Property management		62,389			59,770			19,241			19,014
Fee and asset management		3,207			4,242			1,250			679
Depreciation		482,039			457,822			164,552			158,318
General and administrative		32,462			31,029			10,121			10,221
Total expenses		1,062,921			1,017,086			360,882			348,696
Operating income		414,159			301,887			151,076			105,264
Interest and other income		6,608			5,045			5,317			201
Other expenses		(9,318	)		(9,513	)		(2,528	)		(3,487	)
Interest:
Expense incurred, net		(354,960	)		(348,279	)		(113,370	)		(121,116	)
Amortization of deferred financing costs		(12,129	)		(7,729	)		(4,721	)		(2,437	)
Income (loss) before income and other taxes, (loss) income from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations		44,360			(58,589	)		35,774			(21,575	)
Income and other tax (expense) benefit		(669	)		(283	)		(283	)		(291	)
(Loss) income from investments in unconsolidated entities		—			(735	)		—			188
Net gain on sales of unconsolidated entities		—			28,101			—			22,544
Net gain (loss) on sales of land parcels		4,217			(1,161	)		—			(1,161	)
Income (loss) from continuing operations		47,908			(32,667	)		35,491			(295	)
Discontinued operations, net		779,888			130,438			77,486			30,121
Net income		827,796			97,771			112,977			29,826
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Net income attributable to controlling interests	$	827,378		$	98,394		$	112,590		$	30,014
ALLOCATION OF NET INCOME:
Preference Units	$	10,399		$	10,855		$	3,466		$	3,617
General Partner	$	780,704		$	83,372		$	104,382		$	25,166
Limited Partners		36,275			4,167			4,742			1,231
Net income available to Units	$	816,979		$	87,539		$	109,124		$	26,397
Earnings per Unit – basic:
Income (loss) from continuing operations available to Units	$	0.12		$	(0.15	)	$	0.10		$	(0.01	)
Net income available to Units	$	2.65		$	0.30		$	0.35		$	0.09
Weighted average Units outstanding		307,705			295,572			308,884			296,348
Earnings per Unit – diluted:
Income (loss) from continuing operations available to Units	$	0.12		$	(0.15	)	$	0.10		$	(0.01	)
Net income available to Units	$	2.62		$	0.30		$	0.35		$	0.09
Weighted average Units outstanding		311,908			295,572			312,844			296,348
Distributions declared per Unit outstanding	$	1.0125		$	1.0125		$	0.3375		$	0.3375

See accompanying notes

11

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF OPERATIONS (Continued)

(Amounts in thousands except per Unit data)

(Unaudited)

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Comprehensive income (loss):
Net income	$	827,796		$	97,771		$	112,977		$	29,826
Other comprehensive (loss):
Other comprehensive (loss) – derivative instruments:
Unrealized holding (losses) arising during the period		(130,367	)		(123,472	)		(105,248	)		(37,726	)
Losses reclassified into earnings from other comprehensive income		2,842			2,379			951			914
Other comprehensive income (loss) – other instruments:
Unrealized holding gains (losses) arising during the period		311			(52	)		(182	)		14
Other comprehensive (loss)		(127,214	)		(121,145	)		(104,479	)		(36,798	)
Comprehensive income (loss)		700,582			(23,374	)		8,498			(6,972	)
Comprehensive (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Comprehensive income (loss) attributable to controlling interests	$	700,164		$	(22,751	)	$	8,111		$	(6,784	)

See accompanying notes

12

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	827,796		$	97,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		496,383			501,695
Amortization of deferred financing costs		12,769			7,981
Amortization of discounts and premiums on debt		144			1,454
Amortization of deferred settlements on derivative instruments		2,441			1,978
Write-off of pursuit costs		4,052			3,512
Income from technology investments		(4,537	)		—
Loss from investments in unconsolidated entities		—			735
Distributions from unconsolidated entities – return on capital		318			61
Net (gain) on sales of unconsolidated entities		—			(28,101	)
Net (gain) loss on sales of land parcels		(4,217	)		1,161
Net (gain) on sales of discontinued operations		(759,100	)		(69,538	)
Loss on debt extinguishments		—			158
Unrealized loss on derivative instruments		—			1
Compensation paid with Company Common Shares		16,722			14,716
Changes in assets and liabilities:
Decrease in deposits – restricted		5,101			75
Decrease (increase) in other assets		3,239			(6,385	)
Increase in accounts payable and accrued expenses		60,608			66,070
(Decrease) in accrued interest payable		(28,736	)		(31,257	)
(Decrease) in other liabilities		(20,193	)		(4,150	)
Increase in security deposits		1,261			2,744
Net cash provided by operating activities		614,051			560,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(634,581	)		(1,108,014	)
Investment in real estate – development/other		(93,761	)		(98,282	)
Improvements to real estate		(106,070	)		(98,959	)
Additions to non-real estate property		(4,879	)		(1,022	)
Interest capitalized for real estate and unconsolidated entities under development		(5,931	)		(10,196	)
Proceeds from disposition of real estate, net		1,402,475			134,603
Investments in unconsolidated entities		(865	)		—
Distributions from unconsolidated entities – return of capital		—			26,924
Proceeds from sale of investment securities		—			25,000
Proceeds from technology investments		4,537			—
(Increase) decrease in deposits on real estate acquisitions, net		(210,170	)		248,547
Decrease (increase) in mortgage deposits		1,916			(2,340	)
Consolidation of previously unconsolidated properties		—			(26,854	)
Deconsolidation of previously consolidated properties		28,360			—
Acquisition of Noncontrolling Interests – Partially Owned Properties		(12,809	)		(1,936	)
Net cash provided by (used for) investing activities		368,222			(912,529	)

See accompanying notes

13

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
CASH FLOWS FROM FINANCING ACTIVITIES:
Loan and bond acquisition costs	$	(8,070	)	$	(7,897	)
Mortgage notes payable:
Proceeds		152,930			124,020
Restricted cash		16,595			36,411
Lump sum payoffs		(859,066	)		(491,100	)
Scheduled principal repayments		(12,463	)		(12,508	)
(Loss) on debt extinguishments		—			(158	)
Notes, net:
Proceeds		—			595,422
Lump sum payoffs		(575,641	)		—
Lines of credit:
Proceeds		213,000			4,375,125
Repayments		(187,000	)		(4,229,125	)
(Payments on) settlement of derivative instruments		—			(10,040	)
Proceeds from sale of OP Units		154,508			73,356
Proceeds from EQR’s Employee Share Purchase Plan (ESPP)		4,558			4,251
Proceeds from exercise of EQR options		94,373			57,933
OP Units repurchased and retired		—			(1,887	)
Payment of offering costs		(2,770	)		(730	)
Other financing activities, net		(33	)		(33	)
Contributions – Noncontrolling Interests – Partially Owned Properties		64			222
Distributions:
OP Units – General Partner		(331,928	)		(284,185	)
Preference Units		(10,399	)		(10,858	)
OP Units – Limited Partners		(15,464	)		(14,187	)
Noncontrolling Interests – Partially Owned Properties		(889	)		(1,812	)
Net cash (used for) provided by financing activities		(1,367,695	)		202,220
Net (decrease) in cash and cash equivalents		(385,422	)		(149,628	)
Cash and cash equivalents, beginning of period		431,408			193,288
Cash and cash equivalents, end of period	$	45,986		$	43,660

See accompanying notes

14

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2011			2010
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	$	381,194		$	377,467
Net cash paid (received) for income and other taxes	$	607		$	(2,892	)
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	$	99,131		$	338,196
Valuation of OP Units issued	$	—		$	7,433
Mortgage loans (assumed) by purchaser	$	—		$	(39,999	)
Amortization of deferred financing costs:
Investment in real estate, net	$	—		$	(1,824	)
Deferred financing costs, net	$	12,769		$	9,805
Amortization of discounts and premiums on debt:
Mortgage notes payable	$	(6,116	)	$	(5,048	)
Notes, net	$	6,260		$	6,502
Amortization of deferred settlements on derivative instruments:
Other liabilities	$	(401	)	$	(401	)
Accumulated other comprehensive income	$	2,842		$	2,379
Unrealized loss on derivative instruments:
Other assets	$	5,217		$	13,788
Mortgage notes payable	$	(464	)	$	6
Notes, net	$	(1,476	)	$	9,835
Other liabilities	$	127,090		$	99,844
Accumulated other comprehensive (loss)	$	(130,367	)	$	(123,472	)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	$	(5,760	)	$	(10,196	)
Investments in unconsolidated entities	$	(171	)	$	—
Consolidation of previously unconsolidated properties:
Investment in real estate, net	$	—		$	(105,065	)
Investments in unconsolidated entities	$	—		$	7,376
Deposits – restricted	$	—		$	(42,633	)
Mortgage notes payable	$	—		$	112,631
Net other assets recorded	$	—		$	837
Deconsolidation of previously consolidated properties:
Investment in real estate, net	$	35,495		$	—
Investments in unconsolidated entities	$	(7,135	)	$	—
(Payments on) settlement of derivative instruments:
Other liabilities	$	—		$	(10,040	)
Other:
Receivable on sale of OP Units	$	—		$	37,550
Transfer from notes, net to mortgage notes payable	$	—		$	35,600

See accompanying notes

15

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30, 2011
PARTNERS’ CAPITAL
PREFERENCE UNITS
Balance, beginning of year	$	200,000
Balance, end of period	$	200,000
GENERAL PARTNER
Balance, beginning of year	$	4,948,004
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner		8,095
Issuance of OP Units		154,508
Exercise of EQR share options		94,373
EQR’s Employee Share Purchase Plan (ESPP)		4,558
Conversion of EQR restricted shares to LTIP Units		(3,934	)
Share-based employee compensation expense:
EQR restricted shares		7,277
EQR share options		7,389
EQR ESPP discount		1,070
Offering costs		(2,770	)
Net income available to Units – General Partner		780,704
OP Units – General Partner distributions		(299,383	)
Supplemental Executive Retirement Plan (SERP)		10,198
Acquisition of Noncontrolling Interests – Partially Owned Properties		(4,784	)
Change in market value of Redeemable Limited Partners		16,023
Adjustment for Limited Partners ownership in Operating Partnership		(597	)
Balance, end of period	$	5,720,731
LIMITED PARTNERS
Balance, beginning of year	$	110,399
Conversion of OP Units held by Limited Partners into OP Units held by General Partner		(8,095	)
Conversion of EQR restricted shares to LTIP Units		3,934
Equity compensation associated with Units – Limited Partners		2,734
Net income available to Units – Limited Partners		36,275
Units – Limited Partners distributions		(13,777	)
Change in carrying value of Redeemable Limited Partners		(11,281	)
Adjustment for Limited Partners ownership in Operating Partnership		597
Balance, end of period	$	120,786
ACCUMULATED OTHER COMPREHENSIVE (LOSS)
Balance, beginning of year	$	(57,818	)
Accumulated other comprehensive (loss) – derivative instruments:
Unrealized holding (losses) arising during the period		(130,367	)
Losses reclassified into earnings from other comprehensive income		2,842
Accumulated other comprehensive income – other instruments:
Unrealized holding gains arising during the period		311
Balance, end of period	$	(185,032	)

See accompanying notes

16

ERP OPERATING LIMITED PARTNERSHIP

CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL (Continued)

(Amounts in thousands)

(Unaudited)

	Nine Months Ended September 30, 2011
NONCONTROLLING INTERESTS
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES
Balance, beginning of year	$	7,991
Net income attributable to Noncontrolling Interests		418
Contributions by Noncontrolling Interests		64
Distributions to Noncontrolling Interests		(922	)
Acquisition of Noncontrolling Interests – Partially Owned Properties		(8,025	)
Other		(1,240	)
Balance, end of period	$	(1,714	)

See accompanying notes

17

EQUITY RESIDENTIAL

ERP OPERATING LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Business

Equity Residential (“EQR”), a Maryland real estate investment trust (“REIT”) formed in March 1993, is an S&P 500 company focused on the acquisition, development and management of high quality apartment properties in top United States growth markets. ERP Operating Limited Partnership (“ERPOP”), an Illinois limited partnership, was formed in May 1993 to conduct the multifamily residential property business of Equity Residential. EQR has elected to be taxed as a REIT. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP. Unless otherwise indicated, the notes to consolidated financial statements apply to both the Company and the Operating Partnership.

EQR is the general partner of, and as of September 30, 2011 owned an approximate 95.6% ownership interest in ERPOP. All of the Company’s property ownership, development and related business operations are conducted through the Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR issues public equity from time to time but does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity.

As of September 30, 2011, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 417 properties located in 15 states and the District of Columbia consisting of 119,011 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties):

	Properties		Apartment Units
Wholly Owned Properties		394		110,194
Partially Owned Properties – Consolidated		21		3,916
Military Housing		2		4,901
		417		119,011

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X promulgated under the Securities Act of 1933, as amended. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Certain reclassifications have been made to the prior period financial statements in order to conform to the current year presentation. Operating results for the nine months ended September 30, 2011 are not necessarily indicative of the results that may be expected for the year ending December 31, 2011.

In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

The balance sheets at December 31, 2010 have been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

18

For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in each of the Company’s and the Operating Partnership’s annual reports on Form 10-K for the year ended December 31, 2010.

Income and Other Taxes

Due to the structure of EQR as a REIT and the nature of the operations of its operating properties, no provision for federal income taxes has been made at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their proportionate share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected Taxable REIT Subsidiary (“TRS”) status for certain of its corporate subsidiaries and as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses.

Deferred tax assets and liabilities applicable to the TRS entities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. These assets and liabilities are measured using enacted tax rates for which the temporary differences are expected to be recovered or settled. The effects of changes in tax rates on deferred tax assets and liabilities are recognized in earnings in the period enacted. The Company’s deferred tax assets are generally the result of tax affected amortization of goodwill, differing depreciable lives on capitalized assets and the timing of expense recognition for certain accrued liabilities. As of September 30, 2011, the Company has recorded a deferred tax asset of approximately $38.7 million, which is fully offset by a valuation allowance due to the uncertainty in forecasting future TRS taxable income.

Other

Effective January 1, 2010, in an effort to improve financial standards for transfers of financial assets, more stringent conditions for reporting a transfer of a portion of a financial asset as a sale (e.g. loan participations) are required, the concept of a “qualifying special-purpose entity” and special guidance for guaranteed mortgage securitizations are eliminated, other sale-accounting criteria is clarified and the initial measurement of a transferor’s interest in transferred financial assets is changed. This does not have a material effect on the Company’s consolidated results of operations or financial position.

Effective January 1, 2010, the analysis for identifying the primary beneficiary of a Variable Interest Entity (“VIE”) has been simplified by replacing the previous quantitative-based analysis with a framework that is based more on qualitative judgments. The analysis requires the primary beneficiary of a VIE to be identified as the party that both (a) has the power to direct the activities of a VIE that most significantly impact its economic performance and (b) has an obligation to absorb losses or a right to receive benefits that could potentially be significant to the VIE. For the Company, this includes its consolidated development partnerships as the Company provides substantially all of the capital for these ventures (other than third party mortgage debt, if any). For the Company, these requirements affected only disclosures and had no impact on the Company’s consolidated results of operations or financial position. See Note 6 for further discussion.

The Company is the controlling partner in various consolidated partnerships owning 21 properties and 3,916 apartment units and various completed and uncompleted development properties having a negative noncontrolling interest book value of $1.7 million at September 30, 2011. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated entities described above, the Company is the controlling partner in limited-life partnerships owning six properties. These six partnership agreements contain provisions that require the partnerships to be liquidated through the sale of their assets upon reaching a date specified in each respective partnership agreement. The Company, as controlling partner, has an obligation to cause the property owning partnerships to distribute the proceeds of liquidation to the Noncontrolling Interests in these Partially Owned Properties only to the extent that the net proceeds received by the partnerships from the sale of their assets warrant a distribution based on the partnership agreements. As of September 30, 2011, the Company estimates the value of Noncontrolling Interest distributions for these six properties would have been approximately $32.9 million (“Settlement Value”) had the partnerships been liquidated. This Settlement Value is based on estimated third party consideration realized by the partnerships upon disposition of the six Partially Owned Properties and is net of all other assets and liabilities, including yield maintenance on the mortgages encumbering the properties, that would have been due on September 30, 2011 had those mortgages been prepaid. Due to, among other things, the inherent uncertainty in the sale of real estate assets, the amount of any potential distribution to the Noncontrolling Interests in the Company’s

19

Partially Owned Properties is subject to change. To the extent that the partnerships’ underlying assets are worth less than the underlying liabilities, the Company has no obligation to remit any consideration to the Noncontrolling Interests in these Partially Owned Properties.

Effective January 1, 2011, companies are required to separately disclose purchases, sales, issuances and settlements on a gross basis in the reconciliation of recurring Level 3 fair value measurements. This does not have a material effect on the Company’s consolidated results of operations or financial position. See Note 9 for further discussion.

Effective January 1, 2012, companies will be required to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), companies will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the Company’s valuation processes in determining fair value. In addition, companies will be required to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Companies will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. The Company does not expect this will have a material effect on its consolidated results of operations or financial position.

Effective January 1, 2009, issuers of certain convertible debt instruments that may be settled in cash on conversion were required to separately account for the liability and equity components of the instrument in a manner that reflects each issuer’s nonconvertible debt borrowing rate. As the Company was required to apply this retrospectively, the accounting for its $650.0 million 3.85% convertible unsecured notes that were issued in August 2006 with a final maturity in August 2026 was affected. On August 18, 2011, the Company redeemed these notes at par ($482.5 million was outstanding on August 18, 2011) and no premium was paid. The Company recognized $11.8 million and $13.9 million in interest expense related to the stated coupon rate of 3.85% for the nine months ended September 30, 2011 and 2010, respectively. The amount of the conversion option as of the date of issuance calculated by the Company using a 5.80% effective interest rate was $44.3 million and was amortized to interest expense over the expected life of the convertible notes (through the first put date on August 18, 2011). Total amortization of the cash discount and conversion option discount on the unsecured notes resulted in a reduction to earnings of approximately $5.0 million and $5.8 million, respectively, or $0.02 per share/Unit and $0.02 per share/Unit, respectively, for the nine months ended September 30, 2011 and 2010, and will result in a reduction to earnings of approximately $5.0 million or $0.02 per share/Unit during the full year of 2011. In addition, the Company decreased the January 1, 2009 balance of retained earnings (included in general partner’s capital in the Operating Partnership’s financial statements) by $27.0 million, decreased the January 1, 2009 balance of notes by $17.3 million and increased the January 1, 2009 balance of paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) by $44.3 million. The carrying amount of the conversion option remaining in paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) was $44.3 million at both September 30, 2011 and December 31, 2010. The cash and conversion option discounts were fully amortized at September 30, 2011 and the unamortized cash and conversion option discounts totaled $5.0 million at December 31, 2010.

3. Equity, Capital and Other Interests

Equity and Redeemable Noncontrolling Interests of Equity Residential

The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and Long-Term Incentive Plan (“LTIP”) Units) for the nine months ended September 30, 2011:

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	2011
Common Shares
Common Shares outstanding at January 1,		290,197,242
Common Shares Issued:
Conversion of OP Units		324,649
Issuance of Common Shares		3,038,980
Exercise of share options		2,914,476
Employee Share Purchase Plan (ESPP)		98,766
Restricted share grants, net		148,708
Common Shares Other:
Conversion of restricted shares to LTIP Units		(101,988	)
Common Shares outstanding at September 30,		296,620,833
Units
Units outstanding at January 1,		13,612,037
LTIP Units, net		120,112
Conversion of restricted shares to LTIP Units		101,988
Conversion of OP Units to Common Shares		(324,649	)
Units outstanding at September 30,		13,509,488
Total Common Shares and Units outstanding at September 30,		310,130,321
Units Ownership Interest in Operating Partnership		4.4	%

The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of LTIP Units, are collectively referred to as the “Noncontrolling Interests – Operating Partnership”. Subject to certain exceptions (including the “book-up” requirements of LTIP Units), the Noncontrolling Interests – Operating Partnership may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership Units in total in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total plus the number of Common Shares. Net income is allocated to the Noncontrolling Interests – Operating Partnership based on the weighted average ownership percentage during the period.

The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Noncontrolling Interests – Operating Partnership Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interests – Operating Partnership Units for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interests – Operating Partnership Units.

The Noncontrolling Interests – Operating Partnership Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Noncontrolling Interests – Operating Partnership are differentiated and referred to as “Redeemable Noncontrolling Interests – Operating Partnership”. Instruments that require settlement in registered shares can not be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Noncontrolling Interests – Operating Partnership are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Noncontrolling Interests – Operating Partnership Units that are classified in permanent equity at September 30, 2011 and December 31, 2010.

The carrying value of the Redeemable Noncontrolling Interests – Operating Partnership is allocated based on the number of Redeemable Noncontrolling Interests – Operating Partnership Units in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total. Such percentage of the total carrying value of Units which is ascribed to the Redeemable Noncontrolling Interests – Operating Partnership is then adjusted to the greater of carrying value or fair market value as described above. As of September 30, 2011, the Redeemable Noncontrolling Interests – Operating Partnership have a redemption value of approximately $378.8 million, which represents the value of Common Shares that would be issued in exchange with the Redeemable Noncontrolling Interests – Operating Partnership Units.

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The following table presents the change in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the nine months ended September 30, 2011 (amounts in thousands):

	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

Net proceeds from EQR Common Share and Preferred Share (see definition below) offerings are contributed by EQR to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the Preferred Shares issued in the equity offering). As a result, the net offering proceeds from Common Shares and Preferred Shares are allocated between shareholders’ equity and Noncontrolling Interests – Operating Partnership to account for the change in their respective percentage ownership of the underlying equity of ERPOP.

The Company’s declaration of trust authorizes it to issue up to 100,000,000 preferred shares of beneficial interest, $0.01 par value per share (the “Preferred Shares”), with specific rights, preferences and other attributes as the Board of Trustees may determine, which may include preferences, powers and rights that are senior to the rights of holders of the Company’s Common Shares.

The following table presents the Company’s issued and outstanding Preferred Shares as of September 30, 2011 and December 31, 2010:

			Annual		Amounts in thousands
	Redemption Date (1)		Dividend per Share (2)		September 30, 2011		December 31, 2010
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized:
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 1,000,000 shares issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preferred; liquidation value $250 per share; 600,000 shares issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preferred shares (Series K and N) may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.

(2) Dividends on all series of Preferred Shares are payable quarterly at various pay dates. The dividend listed for Series N is a Preferred Share rate and the equivalent Depositary Share annual dividend is $1.62 per share.

(3) The Series N Preferred Shares have a corresponding depositary share that consists of ten times the number of shares and one-tenth the liquidation value and dividend per share.

Capital and Redeemable Limited Partners of ERP Operating Limited Partnership

The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the nine months ended September 30, 2011:

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	2011
General and Limited Partner Units
General and Limited Partner Units outstanding at January 1,		303,809,279
Issued to General Partner:
Issuance of OP Units		3,038,980
Exercise of EQR share options		2,914,476
EQR’s Employee Share Purchase Plan (ESPP)		98,766
EQR restricted share grants, net		148,708
Issued to Limited Partners:
LTIP Units, net		120,112
General and Limited Partner Units outstanding at September 30,		310,130,321
Limited Partner Units
Limited Partner Units outstanding at January 1,		13,612,037
Limited Partner LTIP Units, net		120,112
Conversion of EQR restricted shares to LTIP Units		101,988
Conversion of Limited Partner OP Units to EQR Common Shares		(324,649	)
Limited Partner Units outstanding at September 30,		13,509,488
Limited Partner Units Ownership Interest in Operating Partnership		4.4	%

The Limited Partners of the Operating Partnership as of September 30, 2011 include various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of LTIP Units. Subject to certain exceptions (including the “book-up” requirements of LTIP Units), Limited Partners may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Limited Partner Units (including redeemable interests) is allocated based on the number of Limited Partner Units in total in proportion to the number of Limited Partner Units in total plus the number of General Partner Units. Net income is allocated to the Limited Partner Units based on the weighted average ownership percentage during the period.

The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Limited Partner Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Limited Partner Units for cash, EQR is obligated to deliver Common Shares to the exchanging limited partner.

The Limited Partner Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Limited Partner Units are differentiated and referred to as “Redeemable Limited Partner Units”. Instruments that require settlement in registered shares can not be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Limited Partner Units are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Limited Partner Units that are classified in permanent equity at September 30, 2011 and December 31, 2010.

The carrying value of the Redeemable Limited Partner Units is allocated based on the number of Redeemable Limited Partner Units in proportion to the number of Limited Partner Units in total. Such percentage of the total carrying value of Limited Partner Units which is ascribed to the Redeemable Limited Partner Units is then adjusted to the greater of carrying value or fair market value as described above. As of September 30, 2011, the Redeemable Limited Partner Units have a redemption value of approximately $378.8 million, which represents the value of Common Shares that would be issued in exchange with the Redeemable Limited Partner Units.

The following table presents the change in the redemption value of the Redeemable Limited Partners for the nine months ended September 30, 2011 (amounts in thousands):

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	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

EQR contributes all net proceeds from its various equity offerings (including proceeds from exercise of options for Common Shares) to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the preferred shares issued in the equity offering).

The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of September 30, 2011 and December 31, 2010:

	Redemption Date (1)		Annual Dividend per Unit (2)		Amounts in thousands
					September 30, 2011		December 31, 2010
Preference Units:
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 1,000,000 units issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preference Units; liquidation value $250 per unit; 600,000 units issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preference units (Series K and N) may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares.

(2) Dividends on all series of Preference Units are payable quarterly at various pay dates. The dividend listed for Series N is a Preference Unit rate and the equivalent depositary unit annual dividend is $1.62 per unit.

(3) The Series N Preference Units have a corresponding depositary unit that consists of ten times the number of units and one-tenth the liquidation value and dividend per unit.

Other

In September 2009, EQR announced the establishment of an At-The-Market (“ATM”) share offering program which would allow EQR to sell up to 17.0 million Common Shares from time to time over the next three years into the existing trading market at current market prices as well as through negotiated transactions. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds from all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis). During the nine months ended September 30, 2011, EQR issued approximately 3.0 million Common Shares at an average price of $50.84 per share for total consideration of approximately $154.5 million through the ATM program. Concurrent with these transactions, ERPOP issued approximately 3.0 million OP Units to EQR. EQR has not issued any shares under this program since January 13, 2011. Including its February 2011 prospectus supplement which added approximately 5.7 million Common Shares, EQR has 10.0 million Common Shares remaining available for issuance under the ATM program as of September 30, 2011.

On June 16, 2011, the shareholders of EQR approved the Company’s 2011 Share Incentive Plan (the “2011 Plan”). The 2011 Plan reserved 12,980,741 Common Shares for issuance. In conjunction with the approval of the 2011 Plan, no further awards may be granted under the 2002 Share Incentive Plan. The 2011 Plan expires on June 16, 2021.

EQR has a share repurchase program authorized by the Board of Trustees under which it has authorization to

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repurchase up to $464.6 million of its shares as of September 30, 2011. No shares were repurchased during the nine months ended September 30, 2011.

During the nine months ended September 30, 2011, the Company acquired all of its partner’s interest in three consolidated partially owned properties consisting of 1,351 apartment units for $12.8 million. In conjunction with these transactions, the Company reduced paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) by $4.8 million and Noncontrolling Interests – Partially Owned Properties by $8.0 million.

4. Real Estate

The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of September 30, 2011 and December 31, 2010 (amounts in thousands):

	September 30, 2011			December 31, 2010
Land	$	4,158,288		$	4,110,275
Depreciable property:
Buildings and improvements		13,822,345			13,995,121
Furniture, fixtures and equipment		1,233,225			1,231,391
Projects under development:
Land		26,772			28,260
Construction-in-progress		92,661			102,077
Land held for development:
Land		162,355			198,465
Construction-in-progress		43,121			36,782
Investment in real estate		19,538,767			19,702,371
Accumulated depreciation		(4,405,479	)		(4,337,357	)
Investment in real estate, net	$	15,133,288		$	15,365,014

During the nine months ended September 30, 2011, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):

	Properties		Apartment Units		Purchase Price
Rental Properties – Consolidated		10		2,529	$	701,748
Land Parcels (three) (1)		—		—		18,450
Other (2)		—		—		11,750
Total		10		2,529	$	731,948

(1) Includes entry into a long-term ground lease for a land parcel in New York City.

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

During the nine months ended September 30, 2011, the Company disposed of the following to unaffiliated parties (sales price in thousands):

	Properties		Apartment Units		Sales Price
Rental Properties – Consolidated		45		13,528	$	1,383,414
Land Parcel (one) (1)		—		—		22,786
Total		45		13,528	$	1,406,200

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

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The Company recognized a net gain on sales of discontinued operations of approximately $759.1 million and a net gain on sales of land parcels of approximately $4.2 million on the above sales.

5. Commitments to Acquire/Dispose of Real Estate

In addition to the properties that were subsequently acquired as discussed in Note 14, the Company has entered into separate agreements to acquire the following (purchase price in thousands):

	Properties		Apartment Units		Purchase Price
Rental Properties		6		2,466	$	354,825
Land Parcels (seven)		—		—		157,987
Total		6		2,466	$	512,812

In addition to the property that was subsequently disposed of as discussed in Note 14, the Company has entered into separate agreements to dispose of the following (sales price in thousands):

	Properties		Apartment Units		Sales Price
Rental Properties		4		351	$	15,550
Total		4		351	$	15,550

The closings of these pending transactions are subject to certain conditions and restrictions, therefore, there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from those summarized in the preceding paragraphs.

6. Investments in Partially Owned Entities

The Company has co-invested in various properties with unrelated third parties which are either consolidated or accounted for under the equity method of accounting (unconsolidated). The following tables and information summarize the Company’s investments in partially owned entities as of September 30, 2011 (amounts in thousands except for project and apartment unit amounts):

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	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development		Completed and Stabilized			Other			Total
Total projects (1)		—		2			19			21
Total apartments units (1)		—		441			3,475			3,916
Balance sheet information at 9/30/11 (at 100%):
ASSETS
Investment in real estate	$	25,071	$	114,570		$	447,939		$	587,580
Accumulated depreciation		—		(11,186	)		(140,444	)		(151,630	)
Investment in real estate, net		25,071		103,384			307,495			435,950
Cash and cash equivalents		1,643		1,578			11,078			14,299
Deposits – restricted		—		2,367			15,177			17,544
Escrow deposits – mortgage		—		50			—			50
Deferred financing costs, net		—		119			1,187			1,306
Other assets		89		132			136			357
Total assets	$	26,803	$	107,630		$	335,073		$	469,506
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable	$	—	$	84,153		$	200,337		$	284,490
Accounts payable & accrued expenses		179		1,327			2,960			4,466
Accrued interest payable		—		258			720			978
Other liabilities		1,274		47			2,862			4,183
Security deposits		—		110			1,482			1,592
Total liabilities		1,453		85,895			208,361			295,709
Noncontrolling Interests – Partially Owned Properties		2,243		1,079			(5,036	)		(1,714	)
Company equity/General and Limited Partners’ Capital		23,107		20,656			131,748			175,511
Total equity/capital		25,350		21,735			126,712			173,797
Total liabilities and equity/capital	$	26,803	$	107,630		$	335,073		$	469,506
Debt – Secured (2):
Company/Operating Partnership Ownership (3)	$	—	$	84,153		$	159,068		$	243,221
Noncontrolling Ownership		—		—			41,269			41,269
Total (at 100%)	$	—	$	84,153		$	200,337		$	284,490

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	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development			Completed and Stabilized			Other			Total
Operating information for the nine months ended 9/30/11 (at 100%):
Operating revenue	$	—		$	6,649		$	43,016		$	49,665
Operating expenses		207			3,083			14,487			17,777
Net operating (loss) income		(207	)		3,566			28,529			31,888
Depreciation		—			3,121			11,256			14,377
General and administrative/other		115			6			50			171
Operating (loss) income		(322	)		439			17,223			17,340
Interest and other income		5			5			10			20
Other expenses		(289	)		—			(39	)		(328	)
Interest:
Expense incurred, net		(399	)		(2,465	)		(8,948	)		(11,812	)
Amortization of deferred financing costs		—			(202	)		(341	)		(543	)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations		(1,005	)		(2,223	)		7,905			4,677
Income and other tax (expense) benefit		(57	)		—			(6	)		(63	)
Net gain on sales of land parcels		4,217			—			—			4,217
Net gain on sales of discontinued operations		169			—			13,265			13,434
Net income (loss)	$	3,324		$	(2,223	)	$	21,164		$	22,265

(1) Project and apartment unit counts exclude all uncompleted development projects until those projects are substantially completed.

(2) All debt is non-recourse to the Company.

(3) Represents the Company’s/Operating Partnership’s current economic ownership interest.

The Company admitted an 80% institutional partner to two separate entities/transactions (one in December 2010 and the other in August 2011), each owning a developable land parcel, in exchange for $40.1 million in cash and retained a 20% equity interest in both of these entities. These land parcels are now unconsolidated. Total project costs are approximately $232.8 million and construction will be predominantly funded with long-term, non-recourse secured loans from the partner. While the Company is the managing member of both of the joint ventures, is responsible for constructing both of the projects and has given certain construction cost overrun guarantees, all major decisions are made jointly, the large majority of funding is provided by the partner and the partner has significant involvement in and oversight of the ongoing projects. The Company’s remaining funding obligations are currently estimated at approximately $6.6 million.

The Company is the controlling partner in various consolidated partnership properties and development properties having a negative noncontrolling interest book value of $1.7 million at September 30, 2011. The Company has identified its development partnerships as VIEs as the Company provides substantially all of the capital for these ventures (other than third party mortgage debt, if any) despite the fact that each partner legally owns 50% of each venture. The Company is the primary beneficiary as it exerts the most significant power over the ventures, absorbs the majority of the expected losses and has the right to receive a majority of the expected residual returns. The assets net of liabilities of the Company’s VIEs are restricted in their use to the specific VIE to which they relate and are not available for general corporate use. The Company does not have any unconsolidated VIEs.

7. Deposits – Restricted

The following table presents the Company’s restricted deposits as of September 30, 2011 and December 31, 2010 (amounts in thousands):

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	September 30, 2011		December 31, 2010
Tax–deferred (1031) exchange proceeds	$	303,762	$	103,887
Earnest money on pending acquisitions		19,559		9,264
Restricted deposits on debt		2,371		18,966
Resident security and utility deposits		39,421		40,745
Other		4,348		8,125
Totals	$	369,461	$	180,987

8. Debt

EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. EQR guarantees the Operating Partnership’s $500.0 million unsecured senior term loan and also guarantees the Operating Partnership’s revolving credit facility up to the maximum amount and for the full term of the facility.

Mortgage Notes Payable

As of September 30, 2011, the Company had outstanding mortgage debt of approximately $4.1 billion.

During the nine months ended September 30, 2011, the Company:

• Repaid $871.5 million of mortgage loans;

• Obtained $152.9 million of new mortgage loan proceeds; and

• Assumed $99.1 million of mortgage debt on three acquired properties.

The Company recorded approximately $4.1 million of write-offs of unamortized deferred financing costs during the nine months ended September 30, 2011 as additional interest expense related to debt extinguishment of mortgages.

As of September 30, 2011, the Company had $411.2 million of secured debt subject to third party credit enhancement.

As of September 30, 2011, scheduled maturities for the Company’s outstanding mortgage indebtedness were at various dates through September 1, 2048. At September 30, 2011, the interest rate range on the Company’s mortgage debt was 0.14% to 11.25%. During the nine months ended September 30, 2011, the weighted average interest rate on the Company’s mortgage debt was 4.83%.

Notes

As of September 30, 2011, the Company had outstanding unsecured notes of approximately $4.6 billion.

During the nine months ended September 30, 2011, the Company:

• Repaid $93.1 million of 6.95% unsecured notes at maturity;

• Exercised the second of its two one-year extension options for its $500.0 million term loan facility and as a result, the maturity date is now October 5, 2012; and

• Redeemed $482.5 million of its 3.85% exchangeable unsecured notes with a final maturity of 2026 at par and no premium was paid.

As of September 30, 2011, scheduled maturities for the Company’s outstanding notes were at various dates through 2026. At September 30, 2011, the interest rate range on the Company’s notes was 0.74% to 7.57%. During the nine months ended September 30, 2011, the weighted average interest rate on the Company’s notes was 5.16%.

Lines of Credit

In July 2011, the Company replaced its then existing unsecured revolving credit facility with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the

29

Company. The Company has the ability to increase available borrowings by an additional $500.0 million by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. The interest rate on advances under the new credit facility will generally be LIBOR plus a spread (currently 1.15%) and the Company pays an annual facility fee of 0.2%. Both the spread and the facility fee are dependent on the credit rating of the Company’s long-term debt. This facility replaced the Company’s existing $1.425 billion facility which was scheduled to mature in February 2012. The Company wrote-off $0.2 million in unamortized deferred financing costs related to the old facility.

As of September 30, 2011, the amount available on the credit facility was $1.14 billion (net of $85.9 million which was restricted/dedicated to support letters of credit and net of $26.0 million outstanding). During the nine months ended September 30, 2011, the weighted average interest rate was 1.32%.

9. Derivative and Other Fair Value Instruments

The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments.

The carrying values of the Company’s mortgage notes payable and unsecured debt (including its line of credit) were approximately $4.1 billion and $4.6 billion, respectively, at September 30, 2011. The fair values of the Company’s mortgage notes payable and unsecured debt (including its line of credit) were approximately $4.4 billion and $5.0 billion, respectively, at September 30, 2011. The fair values of the Company’s financial instruments (other than mortgage notes payable, unsecured notes, lines of credit, derivative instruments and investment securities) including cash and cash equivalents and other financial instruments, approximate their carrying or contract values.

In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments.

The following table summarizes the Company’s consolidated derivative instruments at September 30, 2011 (dollar amounts are in thousands):

	Fair Value Hedges (1)			Forward Starting Swaps (2)
Current Notional Balance	$	315,693		$	950,000
Lowest Possible Notional	$	315,693		$	950,000
Highest Possible Notional	$	317,694		$	950,000
Lowest Interest Rate		2.009	%		3.478	%
Highest Interest Rate		4.800	%		4.695	%
Earliest Maturity Date		2012			2021
Latest Maturity Date		2013			2023

(1) Fair Value Hedges – Converts outstanding fixed rate debt to a floating interest rate.

(2) Forward Starting Swaps – Designed to partially fix the interest rate in advance of a planned future debt issuance. These swaps have mandatory counterparty terminations from 2012 through 2014, and $750.0 million and $200.0 million are targeted to 2012 and 2013 issuances, respectively.

In June 2011, the Company’s remaining development cash flow hedge matured.

A three-level valuation hierarchy exists for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels are defined as follows:

• Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

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• Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

• Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement.

The Company’s derivative positions are valued using models developed by the respective counterparty as well as models developed internally by the Company that use as their basis readily observable market parameters (such as forward yield curves and credit default swap data). Employee holdings other than Common Shares within the supplemental executive retirement plan (the “SERP”) are valued using quoted market prices for identical assets and are included in other assets and other liabilities on the consolidated balance sheet. The Company’s investment securities are valued using quoted market prices or readily available market interest rate data. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners are valued using the quoted market price of Common Shares.

The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying Consolidated Balance Sheets at September 30, 2011 and December 31, 2010:

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	9/30/2011		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level  3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	10,581	$	—	$	10,581	$	—
Supplemental Executive Retirement Plan	Other Assets		66,444		66,444		—		—
Available-for-Sale Investment Securities	Other Assets		1,505		1,505		—		—
Total		$	78,530	$	67,949	$	10,581	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	166,169	$	—	$	166,169	$	—
Supplemental Executive Retirement Plan	Other Liabilities		66,444		66,444		—		—
Total		$	232,613	$	66,444	$	166,169	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	378,798	$	—	$	378,798	$	—

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				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	12/31/2010		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	12,521	$	—	$	12,521	$	—
Forward Starting Swaps	Other Assets		3,276		—		3,276		—
Supplemental Executive Retirement Plan	Other Assets		58,132		58,132		—		—
Available-for-Sale Investment Securities	Other Assets		1,194		1,194		—		—
Total		$	75,123	$	59,326	$	15,797	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	37,756	$	—	$	37,756	$	—
Development Cash Flow Hedges	Other Liabilities		1,322		—		1,322		—
Supplemental Executive Retirement Plan	Other Liabilities		58,132		58,132		—		—
Total		$	97,210	$	58,132	$	39,078	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	383,540	$	—	$	383,540	$	—

The following tables provide a summary of the effect of fair value hedges on the Company’s accompanying Consolidated Statements of Operations for the nine months ended September 30, 2011 and 2010, respectively (amounts in thousands):

September 30, 2011 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative			Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	(1,940	)		Fixed rate debt		Interest expense	$	1,940
Total			$	(1,940	)					$	1,940

September 30, 2010 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative		Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	9,842		Fixed rate debt		Interest expense	$	(9,842	)
Total			$	9,842					$	(9,842	)

The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying Consolidated Statements of Operations for the nine months ended September 30, 2011 and 2010, respectively (amounts in thousands):

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	Effective Portion							Ineffective Portion
September 30, 2011 Type of Cash Flow Hedge	Amount of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(131,689	)	Interest expense	$	(2,842	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,322		Interest expense		—			N/A		—
Total	$	(130,367	)		$	(2,842	)			$	—

	Effective Portion							Ineffective Portion
September 30. 2010 Type of Cash Flow Hedge	Amount  of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(124,908	)	Interest expense	$	(2,379	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,436		Interest expense		—			N/A		—
Total	$	(123,472	)		$	(2,379	)			$	—

As of September 30, 2011 and December 31, 2010, there were approximately $185.9 million and $58.3 million in deferred losses, net, included in accumulated other comprehensive (loss), respectively, related to derivative instruments. Based on the estimated fair values of the net derivative instruments at September 30, 2011, the Company may recognize an estimated $4.4 million of accumulated other comprehensive (loss) as additional interest expense during the twelve months ending September 30, 2012.

The following table sets forth the maturity, amortized cost, gross unrealized gains and losses, book/fair value and interest and other income of the various investment securities held as of September 30, 2011 (amounts in thousands):

		Other Assets
Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	830	$	—	$	1,505	$	—
Total		$	675	$	830	$	—	$	1,505	$	—

10. Earnings Per Share and Earnings Per Unit

Equity Residential

The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):

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	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per share – basic:
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Allocation to Noncontrolling Interests – Operating Partnership, net		(1,648	)		2,042			(1,371	)		173
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests		35,443			(40,857	)		30,267			(3,551	)
Discontinued operations, net of Noncontrolling Interests		745,261			124,229			74,115			28,717
Numerator for net income per share – basic	$	780,704		$	83,372		$	104,382		$	25,166
Numerator for net income per share – diluted (1):
Income from continuing operations	$	47,908					$	35,491
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties		(418	)					(387	)
Preferred distributions		(10,399	)					(3,466	)
Income from continuing operations available to Common Shares		37,091						31,638
Discontinued operations, net		779,888						77,486
Numerator for net income per share – diluted (1)	$	816,979		$	83,372		$	109,124		$	25,166
Denominator for net income per share – basic and diluted (1):
Denominator for net income per share – basic		294,474			281,867			295,831			282,717
Effect of dilutive securities:
OP Units		13,231						13,053
Long-term compensation shares/units		4,203						3,960
Denominator for net income per share – diluted (1)		311,908			281,867			312,844			282,717
Net income per share – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per share – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per share – basic:
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net of Noncontrolling Interests		2.531			0.441			0.251			0.102
Net income per share – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per share – diluted (1):
Income (loss) from continuing operations available to Common Shares	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per share – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

Convertible preferred shares/units that could be converted into 0 and 396,098 weighted average Common Shares for the nine months ended September 30, 2011 and 2010, respectively, and 0 and 393,724 weighted average Common Shares for the quarters ended September 30, 2011 and 2010, respectively, were outstanding but were not included in the computation of diluted earnings per share because the effects would be anti-dilutive. In addition, the effect of the Common Shares that could ultimately have been issued upon the conversion/exchange of the Company’s $650.0 million exchangeable senior notes ($482.5 million outstanding were redeemed on August 18, 2011) was not included in the computation of diluted earnings per share because the effects would be anti-dilutive.

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ERP Operating Limited Partnership

The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per Unit – basic and diluted (1):
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Allocation to Preference Units		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Units		37,091			(42,899	)		31,638			(3,724	)
Discontinued operations, net		779,888			130,438			77,486			30,121
Numerator for net income per Unit – basic and diluted (1)	$	816,979		$	87,539		$	109,124		$	26,397
Denominator for net income per Unit – basic and diluted (1):
Denominator for net income per Unit – basic		307,705			295,572			308,884			296,348
Effect of dilutive securities:
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units		4,203						3,960
Denominator for net income per Unit – diluted (1)		311,908			295,572			312,844			296,348
Net income per Unit – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per Unit – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per Unit – basic:
Income (loss) from continuing operations available to Units	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net		2.531			0.441			0.251			0.102
Net income per Unit – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per Unit – diluted (1):
Income (loss) from continuing operations available to Units	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per Unit – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential Units issuable from the assumed exercise/vesting of the Company’s long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

Convertible preference interests/units that could be converted into 0 and 396,098 weighted average Common Shares (which would be contributed to the Operating Partnership in exchange for OP Units) for the nine months ended September 30, 2011 and 2010, respectively, and 0 and 393,724 weighted average Common Shares (which would be contributed to the Operating Partnership in exchange for OP Units) for the quarters ended September 30, 2011 and 2010, respectively, were outstanding but were not included in the computation of diluted earnings per Unit because the effects would be anti-dilutive. In addition, the effect of the Common Shares/OP Units that could ultimately have been issued upon the conversion/exchange of the Company’s $650.0 million exchangeable senior notes ($482.5 million outstanding were redeemed on August 18, 2011) was not included in the computation of diluted earnings per Unit because the effects would be anti-dilutive.

11. Discontinued Operations

The Company has presented separately as discontinued operations in all periods the results of operations for all consolidated assets disposed of and all properties held for sale, if any.

The components of discontinued operations are outlined below and include the results of operations for the respective periods that the Company owned such assets during the nine months and quarters ended September 30, 2011 and 2010 (amounts in thousands).

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	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
REVENUES
Rental income	$	87,279		$	213,221		$	3,764		$	75,310
Total revenues		87,279			213,221			3,764			75,310
EXPENSES (1)
Property and maintenance		46,177			85,544			2,202			31,051
Real estate taxes and insurance		5,369			17,162			151			5,619
Depreciation		14,344			43,873			901			15,701
General and administrative		49			32			2			13
Total expenses		65,939			146,611			3,256			52,384
Discontinued operating income		21,340			66,610			508			22,926
Interest and other income		140			640			42			7
Interest (2):
Expense incurred, net		(83	)		(6,032	)		(21	)		(2,056	)
Amortization of deferred financing costs		(640	)		(252	)		—			(28	)
Income and other tax (expense) benefit		31			(66	)		93			(13	)
Discontinued operations		20,788			60,900			622			20,836
Net gain on sales of discontinued operations		759,100			69,538			76,864			9,285
Discontinued operations, net	$	779,888		$	130,438		$	77,486		$	30,121

(1) Includes expenses paid in the current period for properties sold or held for sale in prior periods related to the Company’s period of ownership.

(2) Includes only interest expense specific to secured mortgage notes payable for properties sold and/or held for sale.

For the properties sold during the nine months ended September 30, 2011, the investment in real estate, net of accumulated depreciation, and the mortgage notes payable balances at December 31, 2010 were $623.7 million and $50.9 million, respectively.

12. Commitments and Contingencies

The Company, as an owner of real estate, is subject to various Federal, state and local environmental laws. Compliance by the Company with existing laws has not had a material adverse effect on the Company. However, the Company cannot predict the impact of new or changed laws or regulations on its current properties or on properties that it may acquire in the future.

The Company is party to a housing discrimination lawsuit brought by a non-profit civil rights organization in April 2006 in the U.S. District Court for the District of Maryland. The suit alleges that the Company designed and built approximately 300 of its properties in violation of the accessibility requirements of the Fair Housing Act and Americans With Disabilities Act. The suit seeks actual and punitive damages, injunctive relief (including modification of non-compliant properties), costs and attorneys’ fees. The Company believes it has a number of viable defenses, including that a majority of the named properties were completed before the operative dates of the statutes in question and/or were not designed or built by the Company. Accordingly, the Company is defending the suit vigorously. Due to the pendency of the Company’s defenses and the uncertainty of many other critical factual and legal issues, it is not possible to determine or predict the outcome of the suit or a possible loss or a range of loss, and no amounts have been accrued at September 30, 2011. While no assurances can be given, the Company does not believe that the suit, if adversely determined, would have a material adverse effect on the Company.

The Company does not believe there is any other litigation pending or threatened against it that, individually or in the aggregate, may reasonably be expected to have a material adverse effect on the Company.

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The Company had established a reserve and recorded a corresponding reduction to its net gain on sales of discontinued operations related to potential liabilities associated with its condominium conversion activities. The reserve covered potential product liability related to each conversion. The Company periodically assessed the adequacy of the reserve and made adjustments as necessary. During the nine months ended September 30, 2011, the Company recorded additional reserves of approximately $0.1 million, paid approximately $2.3 million in settlements and legal fees and released approximately $1.1 million of remaining reserves. No amounts remain accrued at September 30, 2011 as the Company does not believe it has material exposure remaining for its past condominium conversion activities.

As of September 30, 2011, the Company has four consolidated projects totaling 747 apartment units in various stages of development with commitments to fund of approximately $117.1 million and estimated completion dates ranging through September 30, 2013, as well as other completed development projects that are in various stages of lease up or are stabilized. The consolidated projects under development are being developed solely by the Company, while certain completed development projects were either developed solely by the Company or co-developed with various third party development partners. The development venture agreements with partners are primarily deal-specific, with differing terms regarding profit-sharing, equity contributions, returns on investment, buy-sell agreements and other customary provisions. The partner is most often the “general” or “managing” partner of the development venture. The typical buy-sell arrangements contain appraisal rights and provisions that provide the right, but not the obligation, for the Company to acquire the partner’s interest in the project at fair market value upon the expiration of a negotiated time period (typically two to five years after substantial completion of the project).

As of September 30, 2011, the Company has two unconsolidated projects totaling 945 apartment units under development with commitments to fund of approximately $6.6 million and estimated completion dates ranging through June 30, 2013. While the Company is the managing member of both of the joint ventures, is responsible for constructing both projects and has given certain construction cost overrun guarantees, all major decisions are made jointly, the large majority of funding is provided by the partner and the partner has significant involvement in and oversight of the ongoing projects. The buy-sell arrangements contain provisions that provide the right, but not the obligation, for the Company to acquire the partner’s interests or sell its interests at any time following the occurrence of certain pre-defined events (including at stabilization) described in the development venture agreements.

13. Reportable Segments

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by senior management. Senior management decides how resources are allocated and assesses performance on a monthly basis.

The Company’s primary business is the acquisition, development and management of multifamily residential properties, which includes the generation of rental and other related income through the leasing of apartment units to residents. Senior management evaluates the performance of each of our apartment communities individually and geographically, and both on a same store and non-same store basis; however, each of our apartment communities generally has similar economic characteristics, residents, products and services. The Company’s operating segments have been aggregated by geography in a manner identical to that which is provided to its chief operating decision maker.

The Company’s fee and asset management, development (including its partially owned properties) and condominium conversion activities are immaterial and do not individually meet the threshold requirements of a reportable segment and as such, have been aggregated in the “Other” segment in the tables presented below.

All revenues are from external customers and there is no customer who contributed 10% or more of the Company’s total revenues during the nine months and quarters ended September 30, 2011 and 2010, respectively.

The primary financial measure for the Company’s rental real estate segment is net operating income (“NOI”), which represents rental income less: 1) property and maintenance expense; 2) real estate taxes and insurance expense; and 3) property management expense (all as reflected in the accompanying consolidated statements of operations). The Company believes that NOI is helpful to investors as a supplemental measure of its operating performance because it is a direct measure of the actual operating results of the Company’s apartment communities. Current year NOI is compared to prior year NOI and current year budgeted NOI as a measure of financial performance. The following tables present NOI for each segment from our rental real estate specific to continuing operations for the nine months and quarters ended September 30, 2011 and 2010, respectively, as well as total assets at September 30, 2011 (amounts in thousands):

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	Nine Months Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	440,444	$	255,986	$	266,938	$	320,840	$	—		$	1,284,208
Non-same store/other (2) (3)		113,008		28,544		11,283		30,069		3,286			186,190
Total rental income		553,452		284,530		278,221		350,909		3,286			1,470,398
Operating expenses:
Same store (1)		160,900		91,053		106,223		109,768		—			467,944
Non-same store/other (2) (3)		43,631		10,911		4,162		12,257		6,308			77,269
Total operating expenses		204,531		101,964		110,385		122,025		6,308			545,213
NOI:
Same store (1)		279,544		164,933		160,715		211,072		—			816,264
Non-same store/other (2) (3)		69,377		17,633		7,121		17,812		(3,022	)		108,921
Total NOI	$	348,921	$	182,566	$	167,836	$	228,884	$	(3,022	)	$	925,185
Total assets	$	6,313,643	$	2,656,529	$	2,514,066	$	3,230,549	$	1,042,030		$	15,756,817

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.3 million and other corporate operations.

	Nine Months Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	417,347	$	240,767	$	256,307	$	310,950	$	—		$	1,225,371
Non-same store/other (2) (3)		64,743		10,698		6,429		7,629		(3,493	)		86,006
Total rental income		482,090		251,465		262,736		318,579		(3,493	)		1,311,377
Operating expenses:
Same store (1)		158,351		91,045		106,245		113,510		—			469,151
Non-same store/other (2) (3)		34,241		4,531		2,728		3,490		9,852			54,842
Total operating expenses		192,592		95,576		108,973		117,000		9,852			523,993
NOI:
Same store (1)		258,996		149,722		150,062		197,440		—			756,220
Non-same store/other (2) (3)		30,502		6,167		3,701		4,139		(13,345	)		31,164
Total NOI	$	289,498	$	155,889	$	153,763	$	201,579	$	(13,345	)	$	787,384

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.4 million and other corporate operations.

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	Quarter Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)		Total
Rental income:
Same store (1)	$	163,887	$	91,663	$	90,979	$	110,779	$	—	$	457,308
Non-same store/other (2) (3)		27,889		6,657		3,773		10,862		2,541		51,722
Total rental income		191,776		98,320		94,752		121,641		2,541		509,030
Operating expenses:
Same store (1)		59,736		32,455		35,861		38,160		—		166,212
Non-same store/other (2) (3)		9,163		2,645		1,250		4,351		1,338		18,747
Total operating expenses		68,899		35,100		37,111		42,511		1,338		184,959
NOI:
Same store (1)		104,151		59,208		55,118		72,619		—		291,096
Non-same store/other (2) (3)		18,726		4,012		2,523		6,511		1,203		32,975
Total NOI	$	122,877	$	63,220	$	57,641	$	79,130	$	1,203	$	324,071

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

	Quarter Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	155,119	$	84,969	$	86,963	$	106,457	$	—		$	433,508
Non-same store/other (2) (3)		12,963		2,158		2,002		2,537		(1,336	)		18,324
Total rental income		168,082		87,127		88,965		108,994		(1,336	)		451,832
Operating expenses:
Same store (1)		58,184		32,805		36,219		39,173		—			166,381
Non-same store/other (2) (3)		10,321		855		565		1,114		242			13,097
Total operating expenses		68,505		33,660		36,784		40,287		242			179,478
NOI:
Same store (1)		96,935		52,164		50,744		67,284		—			267,127
Non-same store/other (2) (3)		2,642		1,303		1,437		1,423		(1,578	)		5,227
Total NOI	$	99,577	$	53,467	$	52,181	$	68,707	$	(1,578	)	$	272,354

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

Note: Markets included in the above geographic segments are as follows:

(a) Northeast – New England (excluding Boston), Boston, New York Metro, DC Northern Virginia and Suburban Maryland.

(b) Northwest – Denver, Portland, San Francisco Bay Area and Seattle/Tacoma.

(c) Southeast – Atlanta, Jacksonville, Orlando and South Florida.

(d) Southwest – Inland Empire, Los Angeles, Orange County, Phoenix and San Diego.

The following table presents a reconciliation of NOI from our rental real estate specific to continuing operations for the nine months and quarters ended September 30, 2011 and 2010, respectively (amounts in thousands):

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	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Rental income	$	1,470,398		$	1,311,377		$	509,030		$	451,832
Property and maintenance expense		(314,768	)		(303,916	)		(106,635	)		(104,259	)
Real estate taxes and insurance expense		(168,056	)		(160,307	)		(59,083	)		(56,205	)
Property management expense		(62,389	)		(59,770	)		(19,241	)		(19,014	)
Total operating expenses		(545,213	)		(523,993	)		(184,959	)		(179,478	)
Net operating income	$	925,185		$	787,384		$	324,071		$	272,354

14. Subsequent Events/Other

Subsequent Events

Subsequent to September 30, 2011, the Company:

• Acquired four properties containing 1,000 apartment units for $253.9 million;

• Sold one property containing 385 apartment units for $30.1 million;

• Assumed $27.6 million of mortgage debt in conjunction with the acquisition of one property;

• Repaid $12.8 million in mortgage loans; and

• Obtained $38.0 million of new mortgage loan proceeds.

Other

During the nine months ended September 30, 2011 and 2010, the Company incurred charges of $5.3 million and $6.0 million, respectively, related to property acquisition costs, such as survey, title and legal fees, on the acquisition of operating properties and $4.0 million and $3.5 million, respectively, related to the write-off of various pursuit and out-of-pocket costs for terminated acquisition, disposition and development transactions. These costs, totaling $9.3 million and $9.5 million, respectively, are included in other expenses in the accompanying consolidated statements of operations.

During the nine months ended September 30, 2011, the Company received $4.5 million for the termination of its royalty participation in LRO/Rainmaker, a revenue management system, which is included in interest and other income in the accompanying consolidated statements of operations. During the nine months ended September 30, 2010, the Company received $5.2 million for the settlement of insurance/litigation claims, which is included in interest and other income in the accompanying consolidated statements of operations.

During the nine months ended September 30, 2011, the Company disposed of its corporate housing business for a sales price of approximately $4.0 million, of which the Company provided $2.0 million of seller financing to the buyer. The Company recognized a net gain on the sale of approximately $1.0 million.

In 2010, a portion of the parking garage collapsed at one of the Company’s rental properties (Prospect Towers in Hackensack, New Jersey). The Company estimates that the costs related to such collapse (both expensed and capitalized), including providing for residents’ interim needs, lost revenue and garage reconstruction, will be approximately $11.0 million, after insurance reimbursements of $12.0 million. Costs to rebuild the garage are capitalized as incurred. Other costs, like those to accommodate displaced residents, lost revenue due to a portion of the project being temporarily unavailable for occupancy and legal costs, reduce earnings as they are incurred. Generally, insurance proceeds are recorded as increases to earnings as they are received. During the nine months ended September 30, 2011, the Company received approximately $2.7 million in insurance proceeds which offset expenses of $1.6 million that were recorded relating to this loss and are included in real estate taxes and insurance on the consolidated statements of operations.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

For further information including definitions for capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in each of the Company’s and the Operating Partnership’s Annual Reports on Form 10-K for the year ended December 31, 2010.

Forward-Looking Statements

Forward-looking statements in this report are intended to be made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements are based on current expectations, estimates, projections and assumptions made by management. While the Company’s management believes the assumptions underlying its forward-looking statements are reasonable, such information is inherently subject to uncertainties and may involve certain risks, which could cause actual results, performance or achievements of the Company to differ materially from anticipated future results, performance or achievements expressed or implied by such forward-looking statements. Many of these uncertainties and risks are difficult to predict and beyond management’s control. Forward-looking statements are not guarantees of future performance, results or events. The forward-looking statements contained herein are made as of the date hereof and the Company undertakes no obligation to update or supplement these forward-looking statements. Factors that might cause such differences include, but are not limited to the following:

• We intend to actively acquire and/or develop multifamily properties for rental operations as market conditions dictate. We may also acquire multifamily properties that are unoccupied or in the early stages of lease up. We may be unable to lease apartment properties on schedule, resulting in decreases in expected rental revenues and/or lower yields due to lower occupancy and rates as well as higher than expected concessions. We may underestimate the costs necessary to bring an acquired property up to standards established for its intended market position or to complete a development property. Additionally, we expect that other real estate investors with capital will compete with us for attractive investment opportunities or may also develop properties in markets where we focus our development and acquisition efforts. This competition (or lack thereof) may increase (or depress) prices for multifamily properties. We may not be in a position or have the opportunity in the future to make suitable property acquisitions on favorable terms. The total number of apartment units under development, costs of development and estimated completion dates are subject to uncertainties arising from changing economic conditions (such as the cost of labor and construction materials), competition and local government regulation;

• Debt financing and other capital required by the Company may not be available or may only be available on adverse terms;

• Labor and materials required for maintenance, repair, capital expenditure or development may be more expensive than anticipated;

• Occupancy levels and market rents may be adversely affected by national and local economic and market conditions including slow or negative employment growth and household formation as well as the potential for geopolitical instability, all of which are beyond the Company’s control;

• Our residents may choose to leave our properties or not rent at all because owned housing has become a more attractive option for them due to, among other things, the availability of low interest mortgages, government programs and changes in social preferences; and

• Additional factors as discussed in Part I of both the Company’s and the Operating Partnership’s Annual Reports on Form 10-K, particularly those under “Item 1A. Risk Factors”.

Forward-looking statements and related uncertainties are also included in the Notes to Consolidated Financial Statements in this report.

Overview

Equity Residential (“EQR”), a Maryland real estate investment trust (“REIT”) formed in March 1993, is an S&P 500 company focused on the acquisition, development and management of high quality apartment properties in top United States growth markets. ERP Operating Limited Partnership (“ERPOP”), an Illinois limited partnership, was formed in May 1993 to conduct the multifamily residential property business of Equity Residential. EQR has elected to be taxed as a REIT. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP.

EQR is the general partner of, and as of September 30, 2011 owned an approximate 95.6% ownership interest in ERPOP. All of the Company’s property ownership, development and related business operations are conducted through the

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Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR issues public equity from time to time but does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity.

The Company’s corporate headquarters are located in Chicago, Illinois and the Company also operates property management offices in each of its markets. As of September 30, 2011, the Company had approximately 3,700 employees who provided real estate operations, leasing, legal, financial, accounting, acquisition, disposition, development and other support functions.

Business Objectives and Operating Strategies

The Company invests in apartment communities located in strategically targeted markets with the goal of maximizing our risk adjusted total return (operating income plus capital appreciation) on invested capital.

Our operating focus is on balancing occupancy and rental rates to maximize our revenue while exercising tight cost control to generate the highest possible return to our shareholders. Revenue is maximized by attracting qualified prospects to our properties, cost-effectively converting these prospects into new residents at the highest rent possible, keeping our residents satisfied and renewing their leases at yet higher rents. While we believe that it is our high-quality, well-located assets that bring our customers to us, it is the customer service provided by our on-site personnel that keeps them renting with us and recommending us to their friends.

We use technology to engage our customers in the way that they want to be engaged. Many of our residents utilize our web-based resident portal which allows them to sign their lease, review their account and make payments, provide feedback and make service requests on-line.

We seek to maximize capital appreciation of our properties by investing in markets that are characterized by conditions favorable to multifamily property appreciation. These markets generally feature one or more of the following:

• High barriers to entry where, because of land scarcity or government regulation, it is difficult or costly to build new apartment properties, creating limits on new supply;

• High single family home prices making our apartments a more economical housing choice;

• Strong economic growth leading to household formation and job growth, which in turn leads to high demand for our apartments; and

• An attractive quality of life leading to high demand and retention that allows us to more aggressively increase rents.

Acquisitions and developments may be financed from various sources of capital, which may include retained cash flow, issuance of additional equity and debt, sales of properties and joint venture agreements. In addition, the Company may acquire properties in transactions that include the issuance of limited partnership interests in the Operating Partnership (“OP Units”) as consideration for the acquired properties. Such transactions may, in certain circumstances, enable the sellers to defer, in whole or in part, the recognition of taxable income or gain that might otherwise result from the sales. The Company may acquire land parcels to hold and/or sell based on market opportunities. The Company may also seek to acquire properties by purchasing defaulted or distressed debt that encumbers desirable properties in the hope of obtaining title to property through foreclosure or deed-in-lieu of foreclosure proceedings. The Company has also, in the past, converted some of its properties and sold them as condominiums but is not currently active in this line of business.

The Company primarily sources the funds for new property acquisitions in its core markets with the proceeds from selling assets that are older or located in non-core markets. Since 2005, the Company has sold over 123,000 apartment units for an aggregate sales price of approximately $9.9 billion, acquired over 38,000 apartment units in its core markets for approximately $8.7 billion and began approximately $2.4 billion of development projects. We are currently seeking to acquire and develop assets primarily in the following targeted metropolitan areas: Boston, New York, Washington DC, South Florida, Southern California, San Francisco and Seattle. We also have investments (in the aggregate about 19.6% of our NOI at September 30, 2011) in other markets including Denver, Atlanta, Phoenix, New England (excluding Boston), Orlando and Jacksonville but do not currently intend to acquire or develop new assets in these markets.

As part of its strategy, the Company purchases completed and fully occupied apartment properties, partially

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completed or partially occupied properties or land on which apartment properties can be constructed. We intend to hold a diversified portfolio of assets across our target markets. As of September 30, 2011, no single metropolitan area accounted for more than 16.2% of our NOI, though no guarantee can be made that NOI concentration may not increase in the future.

We endeavor to attract and retain the best employees by providing them with the education, resources and opportunities to succeed. We provide many classroom and on-line training courses to assist our employees in interacting with prospects and residents as well as extensively train our customer service specialists in maintaining the equipment and appliances on our property sites. We actively promote from within and many senior corporate and property leaders have risen from entry level or junior positions. We monitor our employees’ engagement by surveying them annually and have consistently received high engagement scores.

We have a commitment to sustainability and consider the environmental impacts of our business activities. We have a dedicated in-house team that initiates and applies sustainable practices in all aspects of our business, including transactions, property operations and property management activities. With its high density, multifamily housing is, by its nature, an environmentally friendly property type. Our recent acquisition and development activities have been primarily concentrated in pedestrian-friendly urban locations near public transportation. When developing and renovating our properties, we strive to reduce energy and water usage by investing in energy saving technology while positively impacting the experience of our residents and the value of our assets. We continue to implement a combination of irrigation, lighting and HVAC improvements at our properties that will reduce energy and water consumption.

Current Environment

We expect strong growth in full year same store revenue (anticipated increase of 5.0%) and full year NOI (anticipated increase of 7.7%) and are optimistic that the strength in fundamentals realized in 2010 and to date in 2011 will be sustained for the foreseeable future. Despite recent signs of weakness in the overall economy, our business continues to perform well and forward demand indicators such as rental applications and e-leads are better than the same time last year.

The Company continues to sell non-core assets and reduce its exposure to non-core markets as we believe these assets do not fit into our long term plans and we can sell them for prices that we believe are favorable. Through September 30, 2011, we have sold 45 consolidated properties consisting of 13,528 apartment units for $1.38 billion. The majority of our anticipated $1.4 billion in 2011 dispositions occurred in the first half of 2011 ($1.17 billion for the first six months of 2011). The Company’s decision to accelerate the timing and increase the volume of dispositions combined with limited opportunities to reinvest the cash proceeds and/or reinvestment of the cash proceeds in assets with lower cap rates (see definition below) is dilutive to our per share results despite our strong operating performance. The Company defines dilution from transactions as the lost NOI from sales proceeds that were not reinvested in other apartment properties or were reinvested in properties with a lower cap rate. The dispositions generated a significant amount of cash, which combined with the Company’s new unsecured revolving credit facility, allowed us to defer an unsecured debt offering that was previously targeted for the third quarter of 2011. The Company does not expect to sell a material amount of assets in the fourth quarter of 2011 due to tax and reinvestment considerations.

Competition for the properties we are interested in acquiring is significant due to the overall improvement in market fundamentals. Based on our anticipated $1.25 billion in 2011 acquisitions, a slightly greater share should occur during the latter half of the year and approximately one-third are expected to occur in the fourth quarter. We believe our access to capital, our ability to execute large, complex transactions and our ability to efficiently stabilize large scale lease up properties provide us with a competitive advantage. The Company acquired ten consolidated properties consisting of 2,529 apartment units for $701.7 million, one commercial building for potential redevelopment for $11.8 million, two land parcels for $18.5 million and entered into a long-term ground lease on one land parcel during the nine months ended September 30, 2011.

We currently have access to multiple sources of capital including the equity markets as well as both the secured and unsecured debt markets. In July 2010, the Company completed a $600.0 million unsecured ten year note offering with a coupon of 4.75% and an all-in effective interest rate of 5.09%. EQR also raised $291.9 million in equity under its ATM Common Share offering program in 2010 and has raised an additional $154.5 million under this program thus far in 2011. In July 2011, the Company replaced its then existing unsecured revolving credit facility which was due to mature in February 2012 with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the Company. The Company believes that the new facility contains a diversified and strong bank group which increases its balance sheet flexibility going forward.

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We believe that cash and cash equivalents, securities readily convertible to cash, current availability on our revolving credit facility and disposition proceeds for 2011 will provide sufficient liquidity to meet our funding obligations relating to asset acquisitions, debt maturities and existing development projects through 2011. We expect that our remaining longer-term funding requirements will be met through some combination of new borrowings, equity issuances (including EQR’s ATM Common Share offering program), property dispositions, joint ventures and cash generated from operations.

There is significant uncertainty surrounding the futures of Fannie Mae and Freddie Mac (the “Government Sponsored Enterprises” or “GSEs”). Through their lender originator networks, Fannie Mae and Freddie Mac are significant lenders both to the Company and to buyers of the Company’s properties. The two GSEs have a mandate to support multifamily housing through their financing activities. Any changes to their mandates or reductions in their size or the scale of their activities could have a significant impact on the Company and may, among other things, lead to lower values for our disposition assets and higher interest rates on our borrowings. Such changes may also provide an advantage to us by making the cost of financing single family home ownership more expensive and provide us a competitive advantage given the size of our balance sheet and the multiple sources of capital to which we have access.

We believe that the Company is well-positioned as of September 30, 2011 because our properties are geographically diverse and were approximately 95.2% occupied (95.6% on a same store basis), little new multifamily rental supply will be added to most of our markets over the next several years and the long-term demographic picture is positive. We believe our strong balance sheet and ample liquidity will allow us to fund our debt maturities and development costs in the near term, and should also allow us to take advantage of investment opportunities in the future. As economic conditions continue to improve, the short-term nature of our leases and the limited supply of new rental housing being constructed should allow us to realize revenue growth and improvement in our operating results.

The Company anticipates that growth in same store expenses comparing 2011 to 2010 will approximate an increase of 0.5% primarily due to modest increases in real estate tax rates and utility cost growth (same store expenses increased 0.9% for 2010 when compared with the same period in the prior year). This follows three consecutive years of excellent expense control (same store expenses declined 0.1% between 2009 and 2008 and grew 2.2% between 2008 and 2007 and 2.1% between 2007 and 2006). Effective expense controls have continued to date in 2011 as same store expenses declined 0.3% as compared to the same period in 2010.

The current environment information presented above is based on current expectations and is forward-looking.

Results of Operations

In conjunction with our business objectives and operating strategy, the Company continued to invest in apartment properties located in strategically targeted markets during the nine months ended September 30, 2011 as follows:

• Acquired $662.2 million of apartment properties consisting of nine consolidated properties and 2,434 apartment units at a weighted average cap rate (see definition below) of 5.1% and two land parcels for $18.5 million and entered into a long-term ground lease on one land parcel located in New York City, all of which we deem to be in our strategic targeted markets;

• Acquired one unoccupied property in the San Francisco Bay Area in the third quarter of 2011 for $39.5 million consisting of 95 apartment units that is expected to stabilize at a 6.3% yield on cost;

• Acquired a 97,000 square foot commercial building adjacent to our Harbor Steps apartment property in downtown Seattle for $11.8 million for potential redevelopment; and

• Sold $1.4 billion of consolidated apartment properties consisting of 45 properties and 13,528 apartment units at a weighted average cap rate of 6.5% generating an unlevered internal rate of return (IRR), inclusive of management costs, of 11.0% and one land parcel for $22.8 million, the majority of which was in exit or less desirable markets.

The Company’s primary financial measure for evaluating each of its apartment communities is net operating income (“NOI”). NOI represents rental income less property and maintenance expense, real estate tax and insurance expense and property management expense. The Company believes that NOI is helpful to investors as a supplemental measure of its operating performance because it is a direct measure of the actual operating results of the Company’s apartment communities. The cap rate is generally the first year NOI yield (net of replacements) on the Company’s investment.

Properties that the Company owned for all of both of the nine months ended September 30, 2011 and 2010 (the “Nine-Month 2011 Same Store Properties”), which represented 102,129 apartment units, and properties that the

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Company owned for all of both of the quarters ended September 30, 2011 and 2010 (the “Third Quarter 2011 Same Store Properties”), which represented 104,922 apartment units, impacted the Company’s results of operations. Both the Nine-Month 2011 Same Store Properties and the Third Quarter 2011 Same Store Properties are discussed in the following paragraphs.

The Company’s acquisition, disposition and completed development activities also impacted overall results of operations for the nine months and quarters ended September 30, 2011 and 2010. The impacts of these activities are discussed in greater detail in the following paragraphs.

Comparison of the nine months ended September 30, 2011 to the nine months ended September 30, 2010

For the nine months ended September 30, 2011, the Company reported diluted earnings per share/Unit of $2.62 compared to $0.30 per share/Unit in the same period of 2010. The difference is primarily due to higher gains from property sales in 2011 vs. 2010 and higher total property net operating income driven by the positive impact of the Company’s same store and lease-up activity, partially offset by dilution from the Company’s 2010 and 2011 transaction activity.

For the nine months ended September 30, 2011, income from continuing operations increased approximately $80.6 million when compared to the nine months ended September 30, 2010. The increase in continuing operations is discussed below.

Revenues from the Nine-Month 2011 Same Store Properties increased $58.8 million primarily as a result of an increase in average rental rates charged to residents and an increase in occupancy. Expenses from the Nine-Month 2011 Same Store Properties decreased $1.2 million primarily due to a combination of increases and decreases in each category of operating expenses, including decreases in on-site payroll costs, leasing and advertising costs, insurance and repairs and maintenance expenses, partially offset by increases in property management costs, real estate taxes and utilities. The decrease in on-site payroll costs was offset by the increase in property management costs as a result of the creation of the Company’s central business group, which moved certain administrative functions off-site. The following tables provide comparative same store results and statistics for the Nine-Month 2011 Same Store Properties:

September YTD 2011 vs. September YTD 2010

Same Store Results/Statistics

$ in thousands (except for Average Rental Rate) – 102,129 Same Store Apartment Units

	Results									Statistics
Description	Revenues			Expenses			NOI			Average Rental Rate (1)			Occupancy			Turnover
YTD 2011	$	1,284,208		$	467,944		$	816,264		$	1,468			95.3	%		44.4	%
YTD 2010	$	1,225,371		$	469,151		$	756,220		$	1,407			94.9	%		44.0	%
Change	$	58,837		$	(1,207	)	$	60,044		$	61			0.4	%		0.4	%
Change		4.8	%		(0.3	%)		7.9	%		4.3	%

(1) Average rental rate is defined as total rental revenues divided by the weighted average occupied apartment units for the period.

The following table provides comparative same store operating expenses for the Nine-Month 2011 Same Store Properties:

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September YTD 2011 vs. September YTD 2010

Same Store Operating Expenses

$ in thousands – 102,129 Same Store Apartment Units

	Actual YTD 2011		Actual YTD 2010		$ Change			% Change			% of Actual YTD 2011 Operating Expenses
Real estate taxes	$	127,155	$	125,516	$	1,639			1.3	%		27.2	%
On-site payroll (1)		109,904		112,705		(2,801	)		(2.5	%)		23.5	%
Utilities (2)		73,831		72,297		1,534			2.1	%		15.8	%
Repairs and maintenance (3)		67,958		68,653		(695	)		(1.0	%)		14.5	%
Property management costs (4)		51,882		49,015		2,867			5.8	%		11.1	%
Insurance		14,621		15,530		(909	)		(5.9	%)		3.1	%
Leasing and advertising		8,713		11,107		(2,394	)		(21.6	%)		1.9	%
Other on-site operating expenses (5)		13,880		14,328		(448	)		(3.1	%)		2.9	%
Same store operating expenses	$	467,944	$	469,151	$	(1,207	)		(0.3	%)		100.0	%

(1) On-site payroll – Includes payroll and related expenses for on-site personnel including property managers, leasing consultants and maintenance staff.

(2) Utilities – Represents gross expenses prior to any recoveries under the Resident Utility Billing System (“RUBS”). Recoveries are reflected in rental income.

(3) Repairs and maintenance – Includes general maintenance costs, apartment unit turnover costs including interior painting, routine landscaping, security, exterminating, fire protection, snow removal, elevator, roof and parking lot repairs and other miscellaneous building repair costs.

(4) Property management costs – Includes payroll and related expenses for departments, or portions of departments, that directly support on-site management. These include such departments as regional and corporate property management, property accounting, human resources, training, marketing and revenue management, procurement, real estate tax, property legal services and information technology.

(5) Other on-site operating expenses – Includes administrative costs such as office supplies, telephone and data charges and association and business licensing fees.

The following table presents a reconciliation of operating income per the consolidated statements of operations to NOI for the Nine-Month 2011 Same Store Properties:

	Nine Months Ended September 30,
	2011			2010
	(Amounts in thousands)
Operating income	$	414,159		$	301,887
Adjustments:
Non-same store operating results		(108,921	)		(31,164	)
Fee and asset management revenue		(6,682	)		(7,596	)
Fee and asset management expense		3,207			4,242
Depreciation		482,039			457,822
General and administrative		32,462			31,029
Same store NOI	$	816,264		$	756,220

For properties that the Company acquired prior to January 1, 2010 and expects to continue to own through December 31, 2011, the Company anticipates the following same store results for the full year ending December 31, 2011:

2011 Same Store Assumptions
Physical occupancy	95.2	%
Revenue change	5.0	%
Expense change	0.5	%
NOI change	7.7	%

The Company anticipates consolidated rental acquisitions of $1.25 billion and consolidated rental dispositions of

46

$1.4 billion and expects that acquisitions will have a 1.30% lower cap rate than dispositions for the full year ending December 31, 2011.

These 2011 assumptions are based on current expectations and are forward-looking.

Non-same store operating results increased approximately $77.8 million and consist primarily of properties acquired in calendar years 2010 and 2011, as well as operations from the Company’s completed development properties. Although the operations of both the non-same store assets and the same store assets have been positively impacted during the nine months ended September 30, 2011, the non-same store assets have contributed a greater percentage of total NOI to the Company’s overall operating results primarily due to 2010 and 2011 acquisitions, increasing occupancy for properties in lease-up and a longer ownership period in 2011 than 2010. This increase primarily resulted from:

• Development and other miscellaneous properties in lease-up of $29.5 million;

• Properties acquired in 2010 and 2011 of $36.7 million; and

• Newly stabilized development properties of $2.8 million.

See also Note 13 in the Notes to Consolidated Financial Statements for additional discussion regarding the Company’s segment disclosures.

Fee and asset management revenues, net of fee and asset management expenses, increased approximately $0.1 million or 3.6% primarily due to revenues earned on management of the Company’s unconsolidated development joint ventures and lower expenses, partially offset by the unwinding of four institutional joint ventures during 2010.

Property management expenses from continuing operations include off-site expenses associated with the self-management of the Company’s properties as well as management fees paid to any third party management companies. These expenses increased approximately $2.6 million or 4.4%. This increase is primarily attributable to an increase in payroll-related costs, which is largely a result of the creation of the Company’s central business group, which moved certain administrative functions off-site, and increases in education/conference costs and legal and professional fees.

Depreciation expense from continuing operations, which includes depreciation on non-real estate assets, increased approximately $24.2 million or 5.3% primarily as a result of additional depreciation expense on properties acquired in 2010 and 2011, development properties placed in service and capital expenditures for all properties owned, partially offset by a decrease in the amortization of in-place leases due to lower acquisition volume in 2011 and a decrease in the amortization of furniture, fixtures and equipment that were fully depreciated.

General and administrative expenses from continuing operations, which include corporate operating expenses, increased approximately $1.4 million or 4.6% primarily due to an increase in payroll-related costs, which is largely a result of the acceleration of long-term compensation expense for retirement eligible employees. The Company anticipates that general and administrative expenses will approximate $43.0 million for the year ending December 31, 2011. The above assumption is based on current expectations and is forward-looking.

Interest and other income from continuing operations increased approximately $1.6 million or 31.0% primarily as a result of interest earned on cash and cash equivalents and investment securities due to larger overall cash balances during the nine months ended September 30, 2011 as compared to the same period in 2010, forfeited deposits for terminated disposition transactions and proceeds received from the Company’s final royalty participation in LRO/Rainmaker, partially offset by insurance/litigation settlement proceeds that occurred during the nine months ended September 30, 2010 and did not reoccur during the nine months ended September 30, 2011.

Other expenses from continuing operations decreased approximately $0.2 million or 2.0% primarily due to a decrease in property acquisition costs incurred in conjunction with the Company’s lower acquisition volume in 2011, partially offset by an increase in the expensing of overhead (pursuit cost write-offs) as a result of a more active focus on sourcing new development opportunities.

Interest expense from continuing operations, including amortization of deferred financing costs, increased approximately $11.1 million or 3.1% as a result of interest expense on the $600.0 million of unsecured notes that closed in July 2010 and accrued interest on four forward starting swaps, partially offset by lower interest expense on mortgage notes payable due to lower balances during the nine months ended September 30, 2011 as compared to the same period in 2010. During the nine months ended September 30, 2011, the Company capitalized interest costs of approximately $5.9 million as compared to $10.2 million for the nine months ended September 30, 2010. This capitalization of interest primarily relates to consolidated projects under development. The effective interest cost on all indebtedness for the nine months ended

47

September 30, 2011 was 5.27% as compared to 5.14% for the nine months ended September 30, 2010. The Company anticipates that interest expense from continuing operations will approximate $460.0 million to $465.0 million for the year ending December 31, 2011. The above assumption is based on current expectations and is forward-looking.

Income and other tax expense from continuing operations increased $0.4 million primarily due to Tennessee franchise tax refunds received during the nine months ended September 30, 2010 that did not reoccur during the nine months ended September 30, 2011. The Company anticipates that income and other tax expense will approximate $1.0 million for the year ending December 31, 2011. The above assumption is based on current expectations and is forward-looking.

Loss from investments in unconsolidated entities decreased approximately $0.7 million as compared to the nine months ended September 30, 2010 primarily due to the unwinding of four institutional joint ventures during 2010.

Net gain on sales of unconsolidated entities decreased approximately $28.1 million primarily due to the gain on sale and revaluation of seven previously unconsolidated properties that were acquired from the Company’s joint venture partner and the gain on sale for 27 unconsolidated properties that occurred during the nine months ended September 30, 2010 that did not reoccur during the nine months ended September 30, 2011.

Net gain on sales of land parcels increased approximately $5.4 million due to the gain on sale of a land parcel located in suburban Washington D.C. during the nine months ended September 30, 2011 and a loss on sale of a land parcel during the same period in 2010.

Discontinued operations, net increased approximately $649.5 million between the periods under comparison. This increase is primarily due to higher gains from property sales during the nine months ended September 30, 2011 compared to the same period in 2010, partially offset by properties sold in 2011 which reflect operations for none of or a partial period in 2011 in contrast to a full or partial period in 2010. See Note 11 in the Notes to Consolidated Financial Statements for further discussion.

Comparison of the quarter ended September 30, 2011 to the quarter ended September 30, 2010

For the quarter ended September 30, 2011, the Company reported diluted earnings per share/Unit of $0.35 compared to $0.09 per share/Unit in the same period of 2010. The difference is primarily due to higher gains from property sales in 2011 vs. 2010 and higher total property net operating income driven by the positive impact of the Company’s same store and lease-up activity, partially offset by dilution from the Company’s 2010 and 2011 transaction activity.

For the quarter ended September 30, 2011, income from continuing operations increased approximately $35.8 million when compared to the quarter ended September 30, 2010. The increase in continuing operations is discussed below.

Revenues from the Third Quarter 2011 Same Store Properties increased $23.8 million primarily as a result of an increase in average rental rates charged to residents and an increase in occupancy. Expenses from the Third Quarter 2011 Same Store Properties decreased $0.2 million primarily due to decreases in on-site payroll costs, leasing and advertising costs and repairs and maintenance expenses, partially offset by increases in property management costs and real estate taxes. The following tables provide comparative same store results and statistics for the Third Quarter 2011 Same Store Properties:

Third Quarter 2011 vs. Third Quarter 2010

Same Store Results/Statistics

$ in thousands (except for Average Rental Rate) – 104,922 Same Store Apartment Units

	Results									Statistics
Description	Revenues			Expenses			NOI			Average Rental Rate (1)			Occupancy			Turnover
Q3 2011	$	457,308		$	166,212		$	291,096		$	1,524			95.4	%		17.7	%
Q3 2010	$	433,508		$	166,381		$	267,127		$	1,453			94.9	%		17.8	%
Change	$	23,800		$	(169	)	$	23,969		$	71			0.5	%		(0.1	%)
Change		5.5	%		(0.1	%)		9.0	%		4.9	%

(1) Average rental rate is defined as total rental revenues divided by the weighted average occupied apartment units for the period.

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The following table provides comparative same store operating expenses for the Third Quarter 2011 Same Store Properties:

Third Quarter 2011 vs. Third Quarter 2010

Same Store Operating Expenses

$ in thousands – 104,922 Same Store Apartment Units

	Actual Q3 2011		Actual Q3 2010		$ Change			% Change			% of Actual Q3 2011 Operating Expenses
Real estate taxes	$	46,887	$	45,682	$	1,205			2.6	%		28.2	%
On-site payroll (1)		38,871		39,512		(641	)		(1.6	%)		23.4	%
Utilities (2)		25,398		25,063		335			1.3	%		15.3	%
Repairs and maintenance (3)		24,185		24,608		(423	)		(1.7	%)		14.6	%
Property management costs (4)		18,475		17,340		1,135			6.5	%		11.1	%
Insurance		4,991		5,306		(315	)		(5.9	%)		3.0	%
Leasing and advertising		3,025		4,383		(1,358	)		(31.0	%)		1.8	%
Other on-site operating expenses (5)		4,380		4,487		(107	)		(2.4	%)		2.6	%
Same store operating expenses	$	166,212	$	166,381	$	(169	)		(0.1	%)		100.0	%

(1) On-site payroll – Includes payroll and related expenses for on-site personnel including property managers, leasing consultants and maintenance staff.

(2) Utilities – Represents gross expenses prior to any recoveries under the Resident Utility Billing System (“RUBS”). Recoveries are reflected in rental income.

(3) Repairs and maintenance – Includes general maintenance costs, apartment unit turnover costs including interior painting, routine landscaping, security, exterminating, fire protection, snow removal, elevator, roof and parking lot repairs and other miscellaneous building repair costs.

(4) Property management costs – Includes payroll and related expenses for departments, or portions of departments, that directly support on-site management. These include such departments as regional and corporate property management, property accounting, human resources, training, marketing and revenue management, procurement, real estate tax, property legal services and information technology.

(5) Other on-site operating expenses – Includes administrative costs such as office supplies, telephone and data charges and association and business licensing fees.

The following table presents a reconciliation of operating income per the consolidated statements of operations to NOI for the Third Quarter 2011 Same Store Properties:

	Quarter Ended September 30,
	2011			2010
	(Amounts in thousands)
Operating income	$	151,076		$	105,264
Adjustments:
Non-same store operating results		(32,975	)		(5,227	)
Fee and asset management revenue		(2,928	)		(2,128	)
Fee and asset management expense		1,250			679
Depreciation		164,552			158,318
General and administrative		10,121			10,221
Same store NOI	$	291,096		$	267,127

Non-same store operating results increased approximately $27.7 million and consist primarily of properties acquired in calendar years 2010 and 2011, as well as operations from the Company’s completed development properties. Although the operations of both the non-same store assets and the same store assets have been positively impacted during the quarter ended September 30, 2011, the non-same store assets have contributed a greater percentage of total NOI to the Company’s overall operating results primarily due to 2010 and 2011 acquisitions, increasing occupancy for properties in lease-up and a longer ownership period in 2011 than 2010. This increase primarily resulted from:

• Development and other miscellaneous properties in lease-up of $9.3 million;

49

• Properties acquired in 2010 and 2011 of $11.4 million;

• Newly stabilized development properties of $0.8 million; and

• Other miscellaneous properties of $0.3 million.

See also Note 13 in the Notes to Consolidated Financial Statements for additional discussion regarding the Company’s segment disclosures.

Fee and asset management revenues, net of fee and asset management expenses, increased approximately $0.2 million or 15.8% primarily due to revenues earned on management of the Company’s unconsolidated development joint ventures, partially offset by the unwinding of four institutional joint ventures during 2010 and higher expenses.

Property management expenses from continuing operations include off-site expenses associated with the self-management of the Company’s properties as well as management fees paid to any third party management companies. These expenses increased approximately $0.2 million or 1.2%. This increase is primarily attributable to an increase in payroll-related costs, which is largely a result of the creation of the Company’s central business group, which moved certain administrative functions off-site.

Depreciation expense from continuing operations, which includes depreciation on non-real estate assets, increased approximately $6.2 million or 3.9% primarily as a result of additional depreciation expense on properties acquired in 2011, partially offset by a decrease in the amortization of in-place leases due to lower acquisition volume in 2011 compared to 2010.

General and administrative expenses from continuing operations, which include corporate operating expenses, decreased approximately $0.1 million or 1.0% primarily due to a decrease in tax compliance fees, partially offset by an increase in payroll-related costs, which is largely a result of the acceleration of long-term compensation expense for retirement eligible employees.

Interest and other income from continuing operations increased approximately $5.1 million primarily as a result of proceeds received from the Company’s final royalty participation in LRO/Rainmaker during the quarter ended September 30 2011.

Other expenses from continuing operations decreased approximately $1.0 million or 27.5% due to a decrease in property acquisition costs incurred in conjunction with the Company’s lower acquisition volume in 2011 and a decrease in the expensing of overhead (pursuit cost write-offs) during the quarter ended September 30, 2011.

Interest expense from continuing operations, including amortization of deferred financing costs, decreased approximately $5.5 million or 4.4% primarily due to lower interest expense on mortgage notes payable due to lower balances during the nine months ended September 30, 2011 as compared to the same period in 2010 and lower interest expense on the $482.5 million of exchangeable senior notes that were redeemed on August 18, 2011, partially offset by increases in write-offs of unamortized loan costs. During the quarter ended September 30, 2011, the Company capitalized interest costs of approximately $2.2 million as compared to $2.3 million for the quarter ended September 30, 2010. This capitalization of interest primarily relates to consolidated projects under development. The effective interest cost on all indebtedness for the quarter ended September 30, 2011 was 5.30% as compared to 5.15% for the quarter ended September 30, 2010.

Income and other tax expense from continuing operations was consistent between the periods under comparison.

Income from investments in unconsolidated entities decreased approximately $0.2 million as compared to the quarter ended September 30, 2010 primarily due to the unwinding of four institutional joint ventures during 2010.

Net gain on sales of unconsolidated entities decreased approximately $22.5 million primarily due to the gain on sale for 24 unconsolidated properties that occurred during the quarter ended September 30, 2010 and did not reoccur during the quarter ended September 30, 2011.

Net loss on sales of land parcels decreased approximately $1.2 million due to the loss on sale of one land parcel during the quarter ended September 30, 2010 as compared to no land sales during the quarter ended September 30, 2011.

Discontinued operations, net increased approximately $47.4 million between the periods under comparison. This increase is primarily due to higher gains from property sales during the quarter ended September 30, 2011 compared to the same period in 2010, partially offset by properties sold in 2011 which reflect operations for none of or a partial period in 2011

50

in contrast to a full or partial period in 2010. See Note 11 in the Notes to Consolidated Financial Statements for further discussion.

Liquidity and Capital Resources

EQR issues public equity from time to time and does not have any indebtedness as all debt is incurred by the Operating Partnership.

As of January 1, 2011, the Company had approximately $431.4 million of cash and cash equivalents, its restricted 1031 exchange proceeds totaled $103.9 million and it had $1.28 billion available under its then existing revolving credit facility (net of $147.3 million which was restricted/dedicated to support letters of credit and $75.0 million which had been committed by a now bankrupt financial institution and was not available for borrowing). After taking into effect the various transactions discussed in the following paragraphs and the net cash provided by operating activities, the Company’s cash and cash equivalents balance at September 30, 2011 was approximately $46.0 million, its restricted 1031 exchange proceeds totaled $303.8 million and the amount available on its new revolving credit facility was $1.14 billion (net of $85.9 million which was restricted/dedicated to support letters of credit and net of $26.0 million outstanding).

During the nine months ended September 30, 2011, the Company generated proceeds from various transactions, which included the following:

• Disposed of 45 consolidated properties and one land parcel, receiving net proceeds of approximately $1.4 billion;

• Obtained $152.9 million in new mortgage financing; and

• Issued approximately 6.1 million Common Shares (including Common Shares issued under the ATM program – see further discussion below) and received net proceeds of $253.4 million, which were contributed to the capital of the Operating Partnership in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis).

During the nine months ended September 30, 2011, the above proceeds were primarily utilized to:

• Acquire 10 rental properties, a 97,000 square foot commercial building and three land parcels for approximately $634.6 million;

• Invest $93.8 million primarily in development projects; and

• Repay $871.5 million of mortgage loans and $575.6 million of unsecured notes, inclusive of the redemption of $482.5 million of its 3.85% exchangeable unsecured notes with a final maturity of 2026 at par and no premium was paid.

In September 2009, EQR announced the establishment of an At-The-Market (“ATM”) share offering program which would allow EQR to sell up to 17.0 million Common Shares from time to time over the next three years into the existing trading market at current market prices as well as through negotiated transactions. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds from all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis). EQR may, but shall have no obligation to, sell Common Shares through the ATM share offering program in amounts and at times to be determined by EQR. Actual sales will depend on a variety of factors to be determined by EQR from time to time, including (among others) market conditions, the trading price of EQR’s Common Shares and determinations of the appropriate sources of funding for EQR. During the nine months ended September 30, 2011, EQR issued approximately 3.0 million Common Shares at an average price of $50.84 per share for total consideration of approximately $154.5 million through the ATM program. EQR has not issued any shares under this program since January 13, 2011. Through October 27, 2011, EQR has cumulatively issued approximately 12.7 million Common Shares at an average price of $44.94 per share for total consideration of approximately $570.1 million. Including its February 2011 prospectus supplement which added approximately 5.7 million Common Shares, EQR has 10.0 million Common Shares remaining available for issuance under the ATM program as of October 27, 2011.

On June 16, 2011, the shareholders of EQR approved the Company’s 2011 Share Incentive Plan (the “2011 Plan”). The 2011 Plan reserved 12,980,741 Common Shares for issuance. In conjunction with the approval of the 2011 Plan, no further awards may be granted under the 2002 Share Incentive Plan. The 2011 Plan expires on June 16, 2021.

Depending on its analysis of market prices, economic conditions and other opportunities for the investment of available capital, EQR may repurchase its Common Shares pursuant to its existing share repurchase program authorized by the Board of Trustees. As of October 27, 2011, EQR had authorization to repurchase $464.6 million of its shares. No shares

51

were repurchased during 2011. See Note 3 in the Notes to Consolidated Financial Statements for further discussion.

Depending on its analysis of prevailing market conditions, liquidity requirements, contractual restrictions and other factors, the Company may from time to time seek to repurchase and retire its outstanding debt in open market or privately negotiated transactions.

The Company’s total debt summary and debt maturity schedules as of September 30, 2011 are as follows:

Debt Summary as of September 30, 2011

(Amounts in thousands)

	Amounts (1)		% of Total			Weighted Average Rates (1)			Weighted Average Maturities (years)
Secured	$	4,136,848		47.1	%		4.83	%		8.2
Unsecured		4,640,323		52.9	%		5.15	%		4.4
Total	$	8,777,171		100.0	%		5.00	%		6.1
Fixed Rate Debt:
Secured – Conventional	$	3,587,114		40.8	%		5.57	%		7.1
Unsecured – Public/Private		3,806,478		43.4	%		5.83	%		5.0
Fixed Rate Debt		7,393,592		84.2	%		5.71	%		6.0
Floating Rate Debt:
Secured – Conventional		115,285		1.3	%		3.07	%		1.0
Secured – Tax Exempt		434,449		5.0	%		0.27	%		20.1
Unsecured – Public/Private		807,845		9.2	%		1.66	%		1.2
Unsecured – Revolving Credit Facility (2)		26,000		0.3	%		1.32	%		2.8
Floating Rate Debt		1,383,579		15.8	%		1.37	%		6.8
Total	$	8,777,171		100.0	%		5.00	%		6.1

(1) Net of the effect of any derivative instruments. Weighted average rates are for the nine months ended September 30, 2011.

(2) On July 13, 2011, the Company replaced its then existing unsecured revolving credit facility with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the Company. The interest rate on advances under the new credit facility will generally be LIBOR plus a spread (currently 1.15%) and the Company pays an annual facility fee of 0.2%. Both the spread and the facility fee are dependent on the credit rating of the Company’s long-term debt.

Note: The Company capitalized interest of approximately $5.9 million and $10.2 million during the nine months ended September 30, 2011 and 2010, respectively. The Company capitalized interest of approximately $2.2 million and $2.3 million during the quarters ended September 30, 2011 and 2010, respectively.

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Debt Maturity Schedule as of September 30, 2011

(Amounts in thousands)

Year	Fixed Rate (1)		Floating Rate (1)			Total		% of Total			Weighted Average Rates on Fixed Rate Debt (1)			Weighted Average Rates on Total Debt (1)
2011	$	5,474	$	50,622		$	56,096		0.6	%		6.65	%		4.02	%
2012		625,590		536,887	(2)		1,162,477		13.2	%		6.04	%		3.71	%
2013		273,304		308,360			581,664		6.6	%		6.71	%		4.87	%
2014		566,862		48,012	(3)		614,874		7.0	%		5.32	%		5.07	%
2015		419,433		—			419,433		4.8	%		6.31	%		6.31	%
2016		1,190,544		—			1,190,544		13.6	%		5.34	%		5.34	%
2017		1,355,835		456			1,356,291		15.4	%		5.87	%		5.87	%
2018		80,771		16,417			97,188		1.1	%		5.72	%		4.92	%
2019		801,763		20,766			822,529		9.4	%		5.49	%		5.36	%
2020		1,671,836		809			1,672,645		19.1	%		5.50	%		5.50	%
2021+		402,180		401,250			803,430		9.2	%		5.91	%		3.39	%
Total	$	7,393,592	$	1,383,579		$	8,777,171		100.0	%		5.69	%		5.04	%

(1) Net of the effect of any derivative instruments. Weighted average rates are as of September 30, 2011.

(2) Effective April 5, 2011, the Company exercised the second of its two one-year extension options for its $500.0 million term loan facility and as a result, the maturity date is now October 5, 2012.

(3) Includes $26.0 million outstanding on the Company’s unsecured revolving credit facility. As of September 30, 2011, there was approximately $1.14 billion available on this facility.

The following table provides a summary of the Company’s unsecured debt as of September 30, 2011:

Unsecured Debt Summary as of September 30, 2011

(Amounts in thousands)

	Coupon Rate			Due Date			Face Amount		Unamortized Premium/ (Discount)		Net Balance
Fixed Rate Notes:
		6.625	%		03/15/12		$	253,858	$	(92)	$	253,766
		5.500	%		10/01/12			222,133		(219)		221,914
		5.200	%		04/01/13	(1)		400,000		(177)		399,823
Fair Value Derivative Adjustments						(1)		(300,000)		—		(300,000)
		5.250	%		09/15/14			500,000		(182)		499,818
		6.584	%		04/13/15			300,000		(386)		299,614
		5.125	%		03/15/16			500,000		(238)		499,762
		5.375	%		08/01/16			400,000		(897)		399,103
		5.750	%		06/15/17			650,000		(2,924)		647,076
		7.125	%		10/15/17			150,000		(392)		149,608
		4.750	%		07/15/20			600,000		(4,006)		595,994
		7.570	%		08/15/26			140,000		—		140,000
								3,815,991		(9,513)		3,806,478
Floating Rate Notes:
					04/01/13	(1)		300,000		—		300,000
Fair Value Derivative Adjustments						(1)		7,845		—		7,845
Term Loan Facility		LIBOR+0.50	%		10/05/12	(2)(3)		500,000		—		500,000
								807,845		—		807,845
Revolving Credit Facility:		LIBOR+1.15	%		07/13/14	(2)(4)		26,000		—		26,000
Total Unsecured Debt							$	4,649,836	$	(9,513)	$	4,640,323

(1) Fair value interest rate swaps convert $300.0 million of the 5.200% notes due April 1, 2013 to a floating interest rate.

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(2) Facilities are private. All other unsecured debt is public.

(3) Effective April 5, 2011, the Company exercised the second of its two one-year extension options for its $500.0 million term loan facility and as a result, the maturity date is now October 5, 2012.

(4) On July 13, 2011, the Company replaced its then existing unsecured revolving credit facility with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the Company. The interest rate on advances under the new credit facility will generally be LIBOR plus a spread (currently 1.15%) and the Company pays an annual facility fee of 0.2%. Both the spread and the facility fee are dependent on the credit rating of the Company’s long-term debt. As of September 30, 2011, there was approximately $1.14 billion available on the Company’s unsecured revolving credit facility.

On August 18, 2011 (the “Redemption Date”) the Operating Partnership redeemed all of its outstanding 3.85% exchangeable notes for $482.5 million in cash, which was equal to 100% of the principal amount of such notes plus accrued and unpaid interest up to but excluding the Redemption Date (the “Redemption Amount”). The notes were redeemable at the option of the Operating Partnership at any time on or after the Redemption Date, and were also redeemable at the option of the holders on the Redemption Date for the Redemption Amount pursuant to a repurchase right set forth in the terms of the notes. In connection with the redemption and under certain additional conditions, the notes could be exchanged for an amount of cash based on the price of the Company’s Common Shares, with the Operating Partnership having the option of delivering Common Shares instead of cash for the amount by which the exchange value exceeded the principal amount of the notes, if any. No note holder exercised its exchange rights.

An unlimited amount of equity and debt securities remains available for issuance by EQR and ERPOP under effective shelf registration statements filed with the SEC. Most recently, EQR and ERPOP filed a universal shelf registration statement for an unlimited amount of equity and debt securities that automatically became effective upon filing with the SEC in October 2010 and expires on October 14, 2013. However, as of October 27, 2011, issuances under the ATM share offering program are limited to 10.0 million additional shares. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds of all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis) or preference units (on a one-for-one preferred share per preference unit basis).

The Company’s “Consolidated Debt-to-Total Market Capitalization Ratio” as of September 30, 2011 is presented in the following table. The Company calculates the equity component of its market capitalization as the sum of (i) the total outstanding Common Shares and assumed conversion of all Units at the equivalent market value of the closing price of the Company’s Common Shares on the New York Stock Exchange and (ii) the liquidation value of all perpetual preferred shares outstanding.

Equity Residential

Capital Structure as of September 30, 2011

(Amounts in thousands except for share/unit and per share amounts)

Secured Debt					$	4,136,848	47.1	%
Unsecured Debt						4,640,323	52.9	%
Total Debt						8,777,171	100.0	%	35.0	%
Common Shares (includes Restricted Shares)		296,620,833	95.6	%
Units (includes OP Units and LTIP Units)		13,509,488	4.4	%
Total Shares and Units		310,130,321	100.0	%
Common Share Price at September 30, 2011	$	51.87
						16,086,460	98.8	%
Perpetual Preferred Equity (see below)						200,000	1.2	%
Total Equity						16,286,460	100.0	%	65.0	%
Total Market Capitalization					$	25,063,631			100.0	%

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Equity Residential

Perpetual Preferred Equity as of September 30, 2011

(Amounts in thousands except for share and per share amounts)

Series	Redemption Date		Outstanding Shares		Liquidation Value		Annual Dividend Per Share		Annual Dividend Amount		Weighted Average Rate
Preferred Shares:
8.29% Series K		12/10/26		1,000,000	$	50,000	$	4.145	$	4,145
6.48% Series N		6/19/08		600,000		150,000		16.20		9,720
Total Perpetual Preferred Equity				1,600,000	$	200,000			$	13,865		6.93	%

The Operating Partnership’s “Consolidated Debt-to-Total Market Capitalization Ratio” as of September 30, 2011 is presented in the following table. The Operating Partnership calculates the equity component of its market capitalization as the sum of (i) the total outstanding Units at the equivalent market value of the closing price of the Company’s Common Shares on the New York Stock Exchange and (ii) the liquidation value of all perpetual preference units outstanding.

ERP Operating Limited Partnership

Capital Structure as of September 30, 2011

(Amounts in thousands except for unit and per unit amounts)

Secured Debt			$	4,136,848	47.1	%
Unsecured Debt				4,640,323	52.9	%
Total Debt				8,777,171	100.0	%	35.0	%
Total outstanding Units		310,130,321
Common Share Price at September 30, 2011	$	51.87
				16,086,460	98.8	%
Perpetual Preference Units (see below)				200,000	1.2	%
Total Equity				16,286,460	100.0	%	65.0	%
Total Market Capitalization			$	25,063,631			100.0	%

ERP Operating Limited Partnership

Perpetual Preference Units as of September 30, 2011

(Amounts in thousands except for unit and per unit amounts)

Series	Redemption Date		Outstanding Units		Liquidation Value		Annual Dividend Per Unit		Annual Dividend Amount		Weighted Average Rate
Preference Units:
8.29% Series K		12/10/26		1,000,000	$	50,000	$	4.145	$	4,145
6.48% Series N		6/19/08		600,000		150,000		16.20		9,720
Total Perpetual Preference Units				1,600,000	$	200,000			$	13,865		6.93	%

The Company generally expects to meet its short-term liquidity requirements, including capital expenditures related to maintaining its existing properties and certain scheduled unsecured note and mortgage note repayments, through its working capital, net cash provided by operating activities and borrowings under the Company’s revolving credit facility. Under normal operating conditions, the Company considers its cash provided by operating activities to be adequate to meet operating requirements and payments of distributions. However, there may be times when the Company experiences shortfalls in its coverage of distributions, which may cause the Company to consider reducing its distributions and/or using the proceeds from property dispositions or additional financing transactions to make up the difference. Should these shortfalls occur for lengthy periods of time or be material in nature, the Company’s financial condition may be adversely affected and it may not be able to maintain its current distribution levels.

During the fourth quarter of 2010, the Company announced a new dividend policy which it believes will generate payouts more closely aligned with the actual annual operating results of the Company’s core business and

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provide transparency to investors. The Company intends to pay an annual cash dividend equal to approximately 65% of Normalized FFO for the year. Subject to Board of Trustees approval, the Company anticipates the expected dividend payout will be $1.57 to $1.59 per share/Unit ($0.3375 per share/Unit for each of the first three quarters with the balance for the fourth quarter) for the year ending December 31, 2011 to bring the total payment for the year to approximately 65% of Normalized FFO for the year. The above assumption is based on current expectations and is forward-looking. The new dividend policy will lead to a dividend reduction more quickly than in the past should operating results deteriorate and make it less likely that the Company will over distribute. The Company believes that its expected 2011 operating cash flow will be sufficient to cover capital expenditures and distributions.

The Company also expects to meet its long-term liquidity requirements, such as scheduled unsecured note and mortgage debt maturities, property acquisitions, financing of construction and development activities and capital improvements through the issuance of secured and unsecured debt and equity securities, including additional OP Units, and proceeds received from the disposition of certain properties and joint ventures. In addition, the Company has significant unencumbered properties available to secure additional mortgage borrowings in the event that the public capital markets are unavailable or the cost of alternative sources of capital is too high. The fair value of and cash flow from these unencumbered properties are in excess of the requirements the Company must maintain in order to comply with covenants under its unsecured notes and line of credit. Of the $19.5 billion in investment in real estate on the Company’s balance sheet at September 30, 2011, $13.1 billion or 67.0% was unencumbered. However, there can be no assurances that these sources of capital will be available to the Company in the future on acceptable terms or otherwise.

ERPOP’s credit ratings from Standard & Poor’s (“S&P”), Moody’s and Fitch for its outstanding senior debt are BBB+, Baal and BBB+, respectively. EQR’s equity ratings from S&P, Moody’s and Fitch for its outstanding preferred equity are BBB+, Baa2 and BBB-, respectively. During the fourth quarter of 2010, Fitch downgraded ERPOP’s credit rating from A- to BBB+ and EQR’s equity rating from BBB+ to BBB-, which did not have an effect on EQR’s cost of funds. During the first quarter of 2011, Moody’s raised its outlook for both EQR and ERPOP from negative outlook to stable outlook.

The Company’s $1.425 billion (net of $75.0 million which had been committed by a now bankrupt financial institution and was not available for borrowing) long-term revolving credit facility was replaced with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the Company. The interest rate on advances under the new credit facility will generally be LIBOR plus a spread (currently 1.15%) and the Company pays an annual facility fee of 0.2%. Both the spread and the facility fee are dependent on the credit rating of the Company’s long-term debt. As of October 27, 2011, there was available borrowings of $1.02 billion (net of $85.9 million which was restricted/dedicated to support letters of credit and net of $143.0 million outstanding) on the new revolving credit facility. This facility may, among other potential uses, be used to fund property acquisitions, costs for certain properties under development and short-term liquidity requirements.

In 2010, a portion of the parking garage collapsed at one of the Company’s rental properties (Prospect Towers in Hackensack, New Jersey). The Company estimates that the costs related to such collapse (both expensed and capitalized), including providing for residents’ interim needs, lost revenue and garage reconstruction, will be approximately $11.0 million, after insurance reimbursements of $12.0 million. Costs to rebuild the garage are capitalized as incurred. Other costs, like those to accommodate displaced residents, lost revenue due to a portion of the project being temporarily unavailable for occupancy and legal costs, reduce earnings as they are incurred. Generally, insurance proceeds are recorded as increases to earnings as they are received. During the nine months ended September 30, 2011, the Company received approximately $2.7 million in insurance proceeds which offset expenses of $1.6 million that were recorded relating to this loss and are included in real estate taxes and insurance on the consolidated statements of operations. In addition, the Company estimates that its lost revenues approximated $0.7 million during the nine months ended September 30, 2011 as a result of lost occupancy in the high-rise tower following the collapse. Through October 27, 2011, the Company has cumulatively received approximately $9.2 million in insurance proceeds which partially offsets expenses of $7.1 million and the Company’s estimate of its lost revenues, which approximated $2.3 million. None of the amounts referenced above impact same store results.

See Note 14 in the Notes to Consolidated Financial Statements for discussion of the events which occurred subsequent to September 30, 2011.

Capitalization of Fixed Assets and Improvements to Real Estate

Our policy with respect to capital expenditures is generally to capitalize expenditures that improve the value of the property or extend the useful life of the component asset of the property. We track improvements to real estate in two major categories and several subcategories:

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• Replacements (inside the apartment unit). These include:

• flooring such as carpets, hardwood, vinyl, linoleum or tile;

• appliances;

• mechanical equipment such as individual furnace/air units, hot water heaters, etc;

• furniture and fixtures such as kitchen/bath cabinets, light fixtures, ceiling fans, sinks, tubs, toilets, mirrors, countertops, etc; and

• blinds/shades.

All replacements are depreciated over a five to ten-year estimated useful life. We expense as incurred all make-ready maintenance and turnover costs such as cleaning, interior painting of individual apartment units and the repair of any replacement item noted above.

• Building improvements (outside the apartment unit). These include:

• roof replacement and major repairs;

• paving or major resurfacing of parking lots, curbs and sidewalks;

• amenities and common areas such as pools, exterior sports and playground equipment, lobbies, clubhouses, laundry rooms, alarm and security systems and offices;

• major building mechanical equipment systems;

• interior and exterior structural repair and exterior painting and siding;

• major landscaping and grounds improvement; and

• vehicles and office and maintenance equipment.

All building improvements are depreciated over a five to ten-year estimated useful life. We capitalize building improvements and upgrades only if the item: (i) exceeds $2,500 (selected projects must exceed $10,000); (ii) extends the useful life of the asset; and (iii) improves the value of the asset.

For the nine months ended September 30, 2011, our actual improvements to real estate totaled approximately $106.1 million. This includes the following (amounts in thousands except for apartment unit and per apartment unit amounts):

Capital Expenditures to Real Estate

For the Nine Months Ended September 30, 2011

	Total Apartment Units (1)		Replacements (2)		Avg. Per Apartment Unit		Building Improvements		Avg. Per Apartment Unit		Total		Avg. Per Apartment Unit
Same Store Properties (3)		102,129	$	53,872	$	528	$	35,948	$	352	$	89,820	$	880
Non-Same Store Properties (4)		11,981		4,787		449		9,388		880		14,175		1,329
Other (5)		—		1,862				213				2,075
Total		114,110	$	60,521			$	45,549			$	106,070

(1) Total Apartment Units – Excludes 4,901 military housing apartment units for which repairs and maintenance expenses and capital expenditures to real estate are self-funded and do not consolidate into the Company’s results.

(2) Replacements – Includes new expenditures inside the apartment units such as appliances, mechanical equipment, fixtures and flooring, including carpeting. Replacements for same store properties also include $29.2 million spent during the nine months ended September 30, 2011 on apartment unit renovations/rehabs (primarily kitchens and baths) on 4,160 apartment units (equating to about $7,000 per apartment unit rehabbed) designed to reposition these assets for higher rental levels in their respective markets.

(3) Same Store Properties – Primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold.

(4) Non-Same Store Properties – Primarily includes all properties acquired during 2010 and 2011, plus any properties in lease-up and not stabilized as of January 1, 2010. Per apartment unit amounts are based on a weighted average of 10,666 apartment units.

(5) Other – Primarily includes expenditures for properties sold during the period.

For 2011, the Company estimates that it will spend approximately $1,200 per apartment unit of capital expenditures for its same store properties inclusive of apartment unit renovation/rehab costs, or $850 per apartment unit excluding apartment unit renovation/rehab costs. For 2011, the Company estimates that it will spend $41.0 million rehabbing 5,500 apartment units (equating to about $7,500 per apartment unit rehabbed). The above assumptions are

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based on current expectations and are forward-looking.

During the nine months ended September 30, 2011, the Company’s total non-real estate capital additions, such as computer software, computer equipment, and furniture and fixtures and leasehold improvements to the Company’s property management offices and its corporate offices, were approximately $4.9 million. The Company expects to fund approximately $3.6 million in total additions to non-real estate property for the remainder of 2011. The above assumption is based on current expectations and is forward-looking.

Improvements to real estate and additions to non-real estate property are generally funded from net cash provided by operating activities and from investment cash flow.

Derivative Instruments

In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments.

The Company has a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors. When viewed in conjunction with the underlying and offsetting exposure that the derivatives are designed to hedge, the Company has not sustained a material loss from these instruments nor does it anticipate any material adverse effect on its net income or financial position in the future from the use of derivatives it currently has in place.

See Note 9 in the Notes to Consolidated Financial Statements for additional discussion of derivative instruments at September 30, 2011.

Other

Total distributions paid in October 2011 amounted to $107.1 million (excluding distributions on Partially Owned Properties), which included certain distributions declared during the third quarter ended September 30, 2011.

Off-Balance Sheet Arrangements and Contractual Obligations

The Company admitted an 80% institutional partner to two separate entities/transactions (one in December 2010 and the other in August 2011), each owning a developable land parcel, in exchange for $40.1 million in cash and retained a 20% equity interest in both of these entities. These land parcels are now unconsolidated. Total project costs are approximately $232.8 million and construction will be predominantly funded with long-term, non-recourse secured loans from the partner. While the Company is the managing member of both of the joint ventures, is responsible for constructing both of the projects and has given certain construction cost overrun guarantees, all major decisions are made jointly, the large majority of funding is provided by the partner and the partner has significant involvement in and oversight of the ongoing projects. The Company’s remaining funding obligations are currently estimated at approximately $6.6 million. The Company’s strategy with respect to these ventures was to reduce its financial risk related to the development of these properties. However, management does not believe that these investments have a materially different impact upon the Company’s liquidity, cash flows, capital resources, credit or market risk than its other consolidated development activities.

As of September 30, 2011, the Company has four consolidated projects totaling 747 apartment units and two unconsolidated projects totaling 945 apartment units in various stages of development with estimated completion dates ranging through September 30, 2013, as well as other completed development projects that are in various stages of lease up or are stabilized. The development agreements currently in place are discussed in detail in Note 12 of the Company’s Consolidated Financial Statements.

See also Notes 2 and 6 in the Notes to Consolidated Financial Statements for additional discussion regarding the Company’s investments in partially owned entities.

The Company’s contractual obligations for the next five years and thereafter have not changed materially from the amounts and disclosures included in each of the Company’s and the Operating Partnership’s annual reports on Form 10-K, other than as it relates to scheduled debt maturities. See the updated debt maturity schedule included in Liquidity and Capital Resources for further discussion.

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Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to use judgment in the application of accounting policies, including making estimates and assumptions. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different or different assumptions were made, it is possible that different accounting policies would have been applied, resulting in different financial results or different presentation of our financial statements.

The Company has identified five significant accounting policies as critical accounting policies. These critical accounting policies are those that have the most impact on the reporting of our financial condition and those requiring significant judgments and estimates. With respect to these critical accounting policies, management believes that the application of judgments and estimates is consistently applied and produces financial information that fairly presents the results of operations for all periods presented. The five critical accounting policies are:

Acquisition of Investment Properties

The Company allocates the purchase price of properties to net tangible and identified intangible assets acquired based on their fair values. In making estimates of fair values for purposes of allocating purchase price, the Company utilizes a number of sources, including independent appraisals that may be obtained in connection with the acquisition or financing of the respective property, our own analysis of recently acquired and existing comparable properties in our portfolio and other market data. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired.

Impairment of Long-Lived Assets

The Company periodically evaluates its long-lived assets, including its investments in real estate, for indicators of impairment. The judgments regarding the existence of impairment indicators are based on factors such as operational performance, market conditions and legal and environmental concerns, as well as the Company’s ability to hold and its intent with regard to each asset. Future events could occur which would cause the Company to conclude that impairment indicators exist and an impairment loss is warranted.

Depreciation of Investment in Real Estate

The Company depreciates the building component of its investment in real estate over a 30-year estimated useful life, building improvements over a 5-year to 10-year estimated useful life and both the furniture, fixtures and equipment and replacements components over a 5-year to 10-year estimated useful life, all of which are judgmental determinations.

Cost Capitalization

See the Capitalization of Fixed Assets and Improvements to Real Estate section for a discussion of the Company’s policy with respect to capitalization vs. expensing of fixed asset/repair and maintenance costs. In addition, the Company capitalizes an allocation of the payroll and associated costs of employees directly responsible for and who spend their time on the supervision of major capital and/or renovation projects. These costs are reflected on the balance sheet as an increase to depreciable property.

For all development projects, the Company uses its professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. The Company capitalizes interest, real estate taxes and insurance and payroll and associated costs for those individuals directly responsible for and who spend their time on development activities, with capitalization ceasing no later than 90 days following issuance of the certificate of occupancy. These costs are reflected on the balance sheet as construction-in-progress for each specific property. The Company expenses as incurred all payroll costs of on-site employees working directly at our properties, except as noted above on our development properties prior to certificate of occupancy issuance and on specific major renovations at selected properties when additional incremental employees are hired.

Fair Value of Financial Instruments, Including Derivative Instruments

The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company

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bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments.

Funds From Operations and Normalized Funds From Operations

For the nine months ended September 30, 2011, Funds From Operations (“FFO”) available to Common Shares and Units / Units and Normalized FFO available to Common Shares and Units / Units increased $64.4 million, or 13.2%, and $57.1 million, or 11.5%, respectively, as compared to the nine months ended September 30, 2010.

For the quarter ended September 30, 2011, FFO available to Common Shares and Units / Units and Normalized FFO available to Common Shares and Units / Units increased $30.5 million, or 18.4%, and $20.5 million, or 11.9%, respectively, as compared to the quarter ended September 30, 2010.

The following is the Company’s and Operating Partnership’s reconciliation of net income to FFO available to Common Shares and Units / Units and Normalized FFO available to Common Shares and Units / Units for the nine months and quarters ended September 30, 2011 and 2010:

Funds From Operations and Normalized Funds From Operations

(Amounts in thousands)

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Net income	$	827,796		$	97,771		$	112,977		$	29,826
Adjustments:
Net (income) loss attributable to Noncontrolling Interests –
Partially Owned Properties		(418	)		623			(387	)		188
Depreciation		482,039			457,822			164,552			158,318
Depreciation – Non-real estate additions		(4,202	)		(4,842	)		(1,297	)		(1,585	)
Depreciation – Partially Owned and Unconsolidated Properties		(2,263	)		(849	)		(758	)		(856	)
Net (gain) on sales of unconsolidated entities		—			(28,101	)		—			(22,544	)
Discontinued operations:
Depreciation		14,256			43,706			901			15,646
Net (gain) on sales of discontinued operations		(759,100	)		(69,538	)		(76,864	)		(9,285	)
Net incremental gain (loss) on sales of condominium units		2,050			619			935			(12	)
Gain (loss) on sale of Equity Corporate Housing (ECH)		1,022			—			(2	)		—
FFO (1) (3)		561,180			497,211			200,057			169,696
Adjustments:
Asset impairment and valuation allowances		—			—			—			—
Property acquisition costs and write-off of pursuit costs (other expenses)		9,318			9,513			2,528			3,487
Debt extinguishment (gains) losses, including prepayment penalties, preferred share/preference unit redemptions and non-     cash convertible debt discounts		9,250			6,673			677			1,854
(Gains) losses on sales of non-operating assets, net of income and other tax expense (benefit)		(6,554	)		577			(1,025	)		1,189
Other miscellaneous non-comparable items		(7,762	)		(5,192	)		(5,662	)		—
Normalized FFO (2) (3)	$	565,432		$	508,782		$	196,575		$	176,226
FFO (1) (3)	$	561,180		$	497,211		$	200,057		$	169,696
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
FFO available to Common Shares and Units / Units (1) (3) (4)	$	550,781		$	486,356		$	196,591		$	166,079
Normalized FFO (2) (3)	$	565,432		$	508,782		$	196,575		$	176,226
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Normalized FFO available to Common Shares and Units / Units (2) (3) (4)	$	555,033		$	497,927		$	193,109		$	172,609

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(1) The National Association of Real Estate Investment Trusts (“NAREIT”) defines funds from operations (“FFO”) (April 2002 White Paper) as net income (computed in accordance with accounting principles generally accepted in the United States (“GAAP”)), excluding gains (or losses) from sales of depreciable property, plus depreciation and amortization, and after adjustments for unconsolidated partnerships and joint ventures. Adjustments for unconsolidated partnerships and joint ventures will be calculated to reflect funds from operations on the same basis. The April 2002 White Paper states that gain or loss on sales of property is excluded from FFO for previously depreciated operating properties only. Once the Company commences the conversion of apartment units to condominiums, it simultaneously discontinues depreciation of such property.

(2) Normalized funds from operations (“Normalized FFO”) begins with FFO and excludes:

• the impact of any expenses relating to asset impairment and valuation allowances;

• property acquisition and other transaction costs related to mergers and acquisitions and pursuit cost write-offs (other expenses);

• gains and losses from early debt extinguishment, including prepayment penalties, preferred share/preference unit redemptions and the cost related to the implied option value of non-cash convertible debt discounts;

• gains and losses on the sales of non-operating assets, including gains and losses from land parcel and condominium sales, net of the effect of income tax benefits or expenses; and

• other miscellaneous non-comparable items.

(3) The Company believes that FFO and FFO available to Common Shares and Units / Units are helpful to investors as supplemental measures of the operating performance of a real estate company, because they are recognized measures of performance by the real estate industry and by excluding gains or losses related to dispositions of depreciable property and excluding real estate depreciation (which can vary among owners of identical assets in similar condition based on historical cost accounting and useful life estimates), FFO and FFO available to Common Shares and Units / Units can help compare the operating performance of a company’s real estate between periods or as compared to different companies. The company also believes that Normalized FFO and Normalized FFO available to Common Shares and Units / Units are helpful to investors as supplemental measures of the operating performance of a real estate company because they allow investors to compare the company’s operating performance to its performance in prior reporting periods and to the operating performance of other real estate companies without the effect of items that by their nature are not comparable from period to period and tend to obscure the Company’s actual operating results. FFO, FFO available to Common Shares and Units / Units, Normalized FFO and Normalized FFO available to Common Shares and Units / Units do not represent net income, net income available to Common Shares / Units or net cash flows from operating activities in accordance with GAAP. Therefore, FFO, FFO available to Common Shares and Units / Units, Normalized FFO and Normalized FFO available to Common Shares and Units / Units should not be exclusively considered as alternatives to net income, net income available to Common Shares / Units or net cash flows from operating activities as determined by GAAP or as a measure of liquidity. The Company’s calculation of FFO, FFO available to Common Shares and Units / Units, Normalized FFO and Normalized FFO available to Common Shares and Units / Units may differ from other real estate companies due to, among other items, variations in cost capitalization policies for capital expenditures and, accordingly, may not be comparable to such other real estate companies.

(4) FFO available to Common Shares and Units / Units and Normalized FFO available to Common Shares and Units / Units are calculated on a basis consistent with net income available to Common Shares / Units and reflects adjustments to net income for preferred distributions and premiums on redemption of preferred shares/preference units in accordance with accounting principles generally accepted in the United States. The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units are collectively referred to as the “Noncontrolling Interests – Operating Partnership”. Subject to certain restrictions, the Noncontrolling Interests – Operating Partnership may exchange their OP Units for Common Shares on a one-for-one basis.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The Company’s market risk has not changed materially from the amounts and information reported in Part II, Item 7A. Quantitative and Qualitative Disclosures About Market Risk, to each of the Company’s and the Operating Partnership’s Annual Reports on Form 10-K for the year ended December 31, 2010. See the Current Environment section of Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations relating to market risk and the current economic environment. See also Note 9 in the Notes to Consolidated Financial Statements for additional discussion of derivative and other fair value instruments.

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Item 4. Controls and Procedures

Equity Residential

(a) Evaluation of Disclosure Controls and Procedures:

Effective as of September 30, 2011, the Company carried out an evaluation, under the supervision and with the participation of the Company’s management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the Company’s disclosure controls and procedures pursuant to Exchange Act Rules 13a-15 and 15d-15. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures are effective to ensure that information required to be disclosed by the Company in its Exchange Act filings is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

(b) Changes in Internal Control over Financial Reporting:

There were no changes to the internal control over financial reporting of the Company identified in connection with the Company’s evaluation referred to in Item 4(a) above that occurred during the third quarter of 2011 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

ERP Operating Limited Partnership

(a) Evaluation of Disclosure Controls and Procedures:

Effective as of September 30, 2011, the Operating Partnership carried out an evaluation, under the supervision and with the participation of the Operating Partnership’s management, including the Chief Executive Officer and Chief Financial Officer of EQR, of the effectiveness of the Operating Partnership’s disclosure controls and procedures pursuant to Exchange Act Rules 13a-15 and 15d-15. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures are effective to ensure that information required to be disclosed by the Operating Partnership in its Exchange Act filings is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

(b) Changes in Internal Control over Financial Reporting:

There were no changes to the internal control over financial reporting of the Operating Partnership identified in connection with the Operating Partnership’s evaluation referred to in Item 4(a) above that occurred during the third quarter of 2011 that have materially affected, or are reasonably likely to materially affect, the Operating Partnership’s internal control over financial reporting.

62

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The Company and the Operating Partnership do not believe that there have been any material developments in the legal proceedings that were discussed in Part I, Item 3 of both the Company’s and the Operating Partnership’s Annual Reports on Form 10-K for the year ended December 31, 2010.

Item 1A. Risk Factors

There have been no material changes to the risk factors that were discussed in Part I, Item 1A of both the Company’s and the Operating Partnership’s Annual Reports on Form 10-K for the year ended December 31, 2010.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a) Unregistered Common Shares Issued in the Quarter Ended September 30, 2011 – Equity Residential

During the quarter ended September 30, 2011, EQR issued 39,958 Common Shares in exchange for 39,958 OP Units held by various limited partners of the Operating Partnership. OP Units are generally exchangeable into Common Shares on a one-for-one basis or, at the option of the Operating Partnership, the cash equivalent thereof, at any time one year after the date of issuance. These shares were either registered under the Securities Act of 1933, as amended (the “Securities Act”), or issued in reliance on an exemption from registration under Section 4(2) of the Securities Act and the rules and regulations promulgated thereunder, as these were transactions by an issuer not involving a public offering. In light of the manner of the sale and information obtained by EQR from the limited partners in connection with these transactions, EQR believes it may rely on these exemptions.

Item 6. Exhibits – See the Exhibit Index

63

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	EQUITY RESIDENTIAL
Date: November 4, 2011	By:	/s/    MARK J. PARRELL
		Mark J. Parrell
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)
Date: November 4, 2011	By:	/s/    IAN S. KAUFMAN
		Ian S. Kaufman
		Senior Vice President and Chief Accounting Officer
		(Principal Accounting Officer)
	ERP OPERATING LIMITED PARTNERSHIP BY: EQUITY RESIDENTIAL ITS GENERAL PARTNER
Date: November 4, 2011	By:	/s/    MARK J. PARRELL
		Mark J. Parrell
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)
Date: November 4, 2011	By:	/s/    IAN S. KAUFMAN
		Ian S. Kaufman
		Senior Vice President and Chief Accounting Officer
		(Principal Accounting Officer)

EXHIBIT INDEX

The exhibits listed below are filed as part of this report. References to exhibits or other filings under the caption “Location” indicate that the exhibit or other filing has been filed, that the indexed exhibit and the exhibit referred to are the same and that the exhibit referred to is incorporated by reference. The Commission file numbers for our Exchange Act filings referenced below are 1-12252 (Equity Residential) and 0-24920 (ERP Operating Limited Partnership).

Exhibit	Description	Location
10.1	Revolving Credit Agreement dated as of July 13, 2011 among ERP Operating Limited Partnership, Bank of America, N.A., as Administrative Agent, JPMorgan Chase Bank, N.A., as Syndication Agent, J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, and Wells Fargo Securities, LLC, as Joint Lead Arrangers and Joint Book Runners, Suntrust Bank, U.S. Bank National Association, and Wells Fargo Bank, National Association, as Documentation Agents, and Citibank, N.A., Deutsche Bank Securities Inc., and Morgan Stanley Senior Funding, Inc., as Co-Documentation Agents, and a syndicate of other banks (the “Credit Agreement”).	Included as Exhibit 10.1 to Equity Residential’s and ERP Operating Limited Partnership’s Form 8-K dated July 13, 2011, filed on July 14, 2011.
10.2	Guaranty of Payment made as of July 13, 2011 between Equity Residential and Bank of America, N.A., as administrative agent for the banks party to the Credit Agreement.	Included as Exhibit 10.2 to Equity Residential’s and ERP Operating Limited Partnership’s Form 8-K dated July 13, 2011, filed on July 14, 2011.
31.1	Equity Residential – Certification of David J. Neithercut, Chief Executive Officer.	Attached herein.
31.2	Equity Residential – Certification of Mark J. Parrell, Chief Financial Officer.	Attached herein.
31.3	ERP Operating Limited Partnership – Certification of David J. Neithercut, Chief Executive Officer of Registrant’s General Partner.	Attached herein.
31.4	ERP Operating Limited Partnership – Certification of Mark J. Parrell, Chief Financial Officer of Registrant’s General Partner.	Attached herein.
32.1	Equity Residential – Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, of David J. Neithercut, Chief Executive Officer of the Company.	Attached herein.
32.2	Equity Residential – Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, of Mark J. Parrell, Chief Financial Officer of the Company.	Attached herein.
32.3	ERP Operating Limited Partnership – Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, of David J. Neithercut, Chief Executive Officer of Registrant’s General Partner.	Attached herein.
32.4	ERP Operating Limited Partnership – Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, of Mark J. Parrell, Chief Financial Officer of Registrant’s General Partner.	Attached herein.
101	XBRL (Extensible Business Reporting Language). The following materials from Equity Residential’s and ERP Operating Limited Partnership’s Quarterly Report on Form 10-Q for the period ended September 30, 2011, formatted in XBRL: (i) consolidated balance sheets, (ii) consolidated statements of operations, (iii) consolidated statements of cash flows, (iv) consolidated statement of changes in equity (Equity Residential), (v) consolidated statement of changes in capital (ERP Operating Limited Partnership) and (vi) notes to consolidated financial statements.	Attached herein.

EX-31.1

Exhibit 31.1

Equity Residential

CERTIFICATIONS

I, David J. Neithercut, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Equity Residential;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2011

/s/	David J. Neithercut
	David J. Neithercut
	Chief Executive Officer

EX-31.2

Exhibit 31.2

Equity Residential

CERTIFICATIONS

I, Mark J. Parrell, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Equity Residential;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2011

/s/	Mark J. Parrell
	Mark J. Parrell
	Chief Financial Officer

EX-31.3

Exhibit 31.3

ERP Operating Limited Partnership

CERTIFICATIONS

I, David J. Neithercut, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ERP Operating Limited Partnership;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2011

/s/	David J. Neithercut
	David J. Neithercut
	Chief Executive Officer of Registrant’s General Partner

EX-31.4

Exhibit 31.4

ERP Operating Limited Partnership

CERTIFICATIONS

I, Mark J. Parrell, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ERP Operating Limited Partnership;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2011

/s/	Mark J. Parrell
	Mark J. Parrell
	Chief Financial Officer of Registrant’s General Partner

EX-32.1

Exhibit 32.1

Equity Residential

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Equity Residential (the “Company”) on Form 10-Q for the period ending September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David J. Neithercut, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/	David J. Neithercut
David J. Neithercut
Chief Executive Officer
November 4, 2011

EX-32.2

Exhibit 32.2

Equity Residential

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Equity Residential (the “Company”) on Form 10-Q for the period ending September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark J. Parrell, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/	Mark J. Parrell
Mark J. Parrell
Chief Financial Officer
November 4, 2011

EX-32.3

Exhibit 32.3

ERP Operating Limited Partnership

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of ERP Operating Limited Partnership (the “Operating Partnership”) on Form 10-Q for the period ending September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David J. Neithercut, Chief Executive Officer of Equity Residential, general partner of the Operating Partnership, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

/s/	David J. Neithercut
David J. Neithercut
Chief Executive Officer of Registrant’s General Partner
November 4, 2011

EX-32.4

Exhibit 32.4

ERP Operating Limited Partnership

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of ERP Operating Limited Partnership (the “Operating Partnership”) on Form 10-Q for the period ending September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark J. Parrell, Chief Financial Officer of Equity Residential, general partner of the Operating Partnership, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

/s/	Mark J. Parrell
Mark J. Parrell
Chief Financial Officer of Registrant’s General Partner
November 4, 2011

XML

Derivative and Other Fair Value Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011
Fair Value Hedges [Member]
Derivative Instrument Table
Current Notional Balance	$ 315,693
Lowest Possible Notional	315,693
Highest Possible Notional	317,694
Lowest Interest Rate	2.009%
Highest Interest Rate	4.80%
Earliest Maturity Date	2012
Latest Maturity Date	2013
Forward Starting Swaps [Member]
Derivative Instrument Table
Current Notional Balance	950,000
Lowest Possible Notional	950,000
Highest Possible Notional	$ 950,000
Lowest Interest Rate	3.478%
Highest Interest Rate	4.695%
Earliest Maturity Date	2021
Latest Maturity Date	2023

XML

CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investment in real estate
Land	$ 4,158,288	$ 4,110,275
Depreciable property	15,055,570	15,226,512
Projects under development	119,433	130,337
Land held for development	205,476	235,247
Investment in real estate	19,538,767	19,702,371
Accumulated depreciation	(4,405,479)	(4,337,357)
Investment in real estate, net	15,133,288	15,365,014
Cash and cash equivalents	45,986	431,408
Investments in unconsolidated entities	11,020	3,167
Deposits - restricted	369,461	180,987
Escrow deposits - mortgage	10,677	12,593
Deferred financing costs, net	37,334	42,033
Other assets	149,051	148,992
Total assets	15,756,817	16,184,194
Liabilities:
Mortgage notes payable	4,136,848	4,762,896
Notes, net	4,614,323	5,185,180
Lines of credit	26,000	0
Accounts payable and accrued expenses	97,845	39,452
Accrued interest payable	69,895	98,631
Other liabilities	409,591	304,202
Security deposits	62,073	60,812
Distributions payable	106,673	140,905
Total liabilities	9,523,248	10,592,078
Commitments and contingencies
Partners' Capital:
Accumulated other comprehensive (loss)	(185,032)	(57,818)
Noncontrolling Interests - Partially Owned Properties	(1,714)	7,991
Total liabilities and equity	15,756,817	16,184,194
OPERATING PARTNERSHIP
Investment in real estate
Land	4,158,288	4,110,275
Depreciable property	15,055,570	15,226,512
Projects under development	119,433	130,337
Land held for development	205,476	235,247
Investment in real estate	19,538,767	19,702,371
Accumulated depreciation	(4,405,479)	(4,337,357)
Investment in real estate, net	15,133,288	15,365,014
Cash and cash equivalents	45,986	431,408
Investments in unconsolidated entities	11,020	3,167
Deposits - restricted	369,461	180,987
Escrow deposits - mortgage	10,677	12,593
Deferred financing costs, net	37,334	42,033
Other assets	149,051	148,992
Total assets	15,756,817	16,184,194
Liabilities:
Mortgage notes payable	4,136,848	4,762,896
Notes, net	4,614,323	5,185,180
Lines of credit	26,000	0
Accounts payable and accrued expenses	97,845	39,452
Accrued interest payable	69,895	98,631
Other liabilities	409,591	304,202
Security deposits	62,073	60,812
Distributions payable	106,673	140,905
Total liabilities	9,523,248	10,592,078
Commitments and contingencies
Redeemable Limited Partners	378,798	383,540
Partners' Capital:
Preference Units	200,000	200,000
General Partner	5,720,731	4,948,004
Limited Partners	120,786	110,399
Accumulated other comprehensive (loss)	(185,032)	(57,818)
Total partners' capital	5,856,485	5,200,585
Noncontrolling Interests - Partially Owned Properties	(1,714)	7,991
Total capital	5,854,771	5,208,576
Total liabilities and equity	$ 15,756,817	$ 16,184,194

XML

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Shareholders' equity:
Preferred Shares of beneficial interest, par value	$ 0.01	$ 0.01
Preferred Shares of beneficial interest, shares authorized	100,000,000	100,000,000
Preferred Shares of beneficial interest, shares issued	1,600,000	1,600,000
Preferred Shares of beneficial interest, shares outstanding	1,600,000	1,600,000
Common Shares of beneficial interest, par value	$ 0.01	$ 0.01
Common Shares of beneficial interest, shares authorized	1,000,000,000	1,000,000,000
Common Shares of beneficial interest, shares issued	296,620,833	290,197,242
Common Shares of beneficial interest, shares outstanding	296,620,833	290,197,242

XML

Derivative and Other Fair Value Instruments (Details 3) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Effective Portion - Amount of Gain/ (Loss) Recognized in OCI on Derivative	$ (130,367)	$ (123,472)
Effective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income	(2,842)	(2,379)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income	0
Forward Starting Swaps/Treasury Locks [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Effective Portion - Amount of Gain/ (Loss) Recognized in OCI on Derivative	(131,689)	(124,908)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income	0
Forward Starting Swaps/Treasury Locks [Member] | Interest Expense [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Effective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income	(2,842)	(2,379)
Development Interest Rate Swaps/Caps [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Effective Portion - Amount of Gain/ (Loss) Recognized in OCI on Derivative	1,322	1,436
Development Interest Rate Swaps/Caps [Member] | Interest Expense [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Effective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income	$ 0

XML

Discontinued Operations

9 Months Ended

Sep. 30, 2011

Discontinued Operations [Abstract]

Discontinued Operations

11. Discontinued Operations

The Company has presented separately as discontinued operations in all periods the results of operations for all consolidated assets disposed of and all properties held for sale, if any.

The components of discontinued operations are outlined below and include the results of operations for the respective periods that the Company owned such assets during the nine months and quarters ended September 30, 2011 and 2010 (amounts in thousands).

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
REVENUES
Rental income	$	87,279		$	213,221		$	3,764		$	75,310
Total revenues		87,279			213,221			3,764			75,310
EXPENSES (1)
Property and maintenance		46,177			85,544			2,202			31,051
Real estate taxes and insurance		5,369			17,162			151			5,619
Depreciation		14,344			43,873			901			15,701
General and administrative		49			32			2			13
Total expenses		65,939			146,611			3,256			52,384
Discontinued operating income		21,340			66,610			508			22,926
Interest and other income		140			640			42			7
Interest (2):
Expense incurred, net		(83	)		(6,032	)		(21	)		(2,056	)
Amortization of deferred financing costs		(640	)		(252	)		—			(28	)
Income and other tax (expense) benefit		31			(66	)		93			(13	)
Discontinued operations		20,788			60,900			622			20,836
Net gain on sales of discontinued operations		759,100			69,538			76,864			9,285
Discontinued operations, net	$	779,888		$	130,438		$	77,486		$	30,121

(1) Includes expenses paid in the current period for properties sold or held for sale in prior periods related to the Company’s period of ownership.

(2) Includes only interest expense specific to secured mortgage notes payable for properties sold and/or held for sale.

For the properties sold during the nine months ended September 30, 2011, the investment in real estate, net of accumulated depreciation, and the mortgage notes payable balances at December 31, 2010 were $623.7 million and $50.9 million, respectively.

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Document and Entity Information (USD $) In Billions, except Share data	9 Months Ended
	Sep. 30, 2011	Oct. 27, 2011	Jun. 30, 2010
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	0000906107
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 11.4
Entity Common Stock, Shares Outstanding		296,628,624
OPERATING PARTNERSHIP
Entity Registrant Name	ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key	0000906107
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 11.4
Entity Common Stock, Shares Outstanding		296,628,624

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Deposits - Restricted (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Restricted Deposits
Tax - deferred (1031) exchange proceeds	$ 303,762	$ 103,887
Earnest money on pending acquisitions	19,559	9,264
Restricted deposits on debt	2,371	18,966
Resident security and utility deposits	39,421	40,745
Other	4,348	8,125
Totals	$ 369,461	$ 180,987

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Subsequent Events/Other

9 Months Ended

Sep. 30, 2011

Subsequent Events/Other [Abstract]

Subsequent Events/Other

14. Subsequent Events/Other

Subsequent Events

Subsequent to September 30, 2011, the Company:

• Acquired four properties containing 1,000 apartment units for $253.9 million;

• Sold one property containing 385 apartment units for $30.1 million;

• Assumed $27.6 million of mortgage debt in conjunction with the acquisition of one property;

• Repaid $12.8 million in mortgage loans; and

• Obtained $38.0 million of new mortgage loan proceeds.

Other

During the nine months ended September 30, 2011 and 2010, the Company incurred charges of $5.3 million and $6.0 million, respectively, related to property acquisition costs, such as survey, title and legal fees, on the acquisition of operating properties and $4.0 million and $3.5 million, respectively, related to the write-off of various pursuit and out-of-pocket costs for terminated acquisition, disposition and development transactions. These costs, totaling $9.3 million and $9.5 million, respectively, are included in other expenses in the accompanying consolidated statements of operations.

During the nine months ended September 30, 2011, the Company received $4.5 million for the termination of its royalty participation in LRO/Rainmaker, a revenue management system, which is included in interest and other income in the accompanying consolidated statements of operations. During the nine months ended September 30, 2010, the Company received $5.2 million for the settlement of insurance/litigation claims, which is included in interest and other income in the accompanying consolidated statements of operations.

During the nine months ended September 30, 2011, the Company disposed of its corporate housing business for a sales price of approximately $4.0 million, of which the Company provided $2.0 million of seller financing to the buyer. The Company recognized a net gain on the sale of approximately $1.0 million.

In 2010, a portion of the parking garage collapsed at one of the Company’s rental properties (Prospect Towers in Hackensack, New Jersey). The Company estimates that the costs related to such collapse (both expensed and capitalized), including providing for residents’ interim needs, lost revenue and garage reconstruction, will be approximately $11.0 million, after insurance reimbursements of $12.0 million. Costs to rebuild the garage are capitalized as incurred. Other costs, like those to accommodate displaced residents, lost revenue due to a portion of the project being temporarily unavailable for occupancy and legal costs, reduce earnings as they are incurred. Generally, insurance proceeds are recorded as increases to earnings as they are received. During the nine months ended September 30, 2011, the Company received approximately $2.7 million in insurance proceeds which offset expenses of $1.6 million that were recorded relating to this loss and are included in real estate taxes and insurance on the consolidated statements of operations.

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Investments in Partially Owned Entities (Details Textuals) (USD $)	1 Months Ended		9 Months Ended
	Aug. 31, 2011 Entities	Dec. 31, 2010 Entities	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse
Noncontrolling Interest [Line Items]
Partially Owned Properties		$ 7,991,000	$ (1,714,000)
Significant Acquisitions and Disposals [Line Items]
Units - acquired			2,529
Properties - acquired			10
Investments In Partially Owned Entities (Textuals) [Abstract]
Partner's acquired 80% equity interest			80.00%
Partner's payment to Acquire Additional Interest in unconsolidated properties			40,100,000
VIE ownership			50.00%
Total project cost			232,800,000
Estimated remaining funding obligation			6,600,000
Number of Entities	2	2
Consolidated Other [Member]
Noncontrolling Interest [Line Items]
Partially Owned Properties			$ 1,700,000
Institutional Partner [Member]
Significant Acquisitions and Disposals [Line Items]
Interest retained			20.00%

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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands	Total	ACCUMULATED OTHER COMPREHENSIVE (LOSS)	PARTIALLY OWNED PROPERTIES	OPERATING PARTNERSHIP	OPERATING PARTNERSHIP PREFERENCE UNITS	OPERATING PARTNERSHIP ACCUMULATED OTHER COMPREHENSIVE (LOSS)	OPERATING PARTNERSHIP PARTIALLY OWNED PROPERTIES	OPERATING PARTNERSHIP GENERAL PARTNER	OPERATING PARTNERSHIP LIMITED PARTNERS
Balance, beginning of year at Dec. 31, 2010					$ 200,000	$ (57,818)	$ 7,991	$ 4,948,004	$ 110,399
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner								8,095	(8,095)
Issuance of OP Units								154,508
Exercise of EQR share options								94,373
EQR's Employee Share Purchase Plan (ESPP)								4,558
Conversion of EQR restricted shares to LTIP Units				3,934				(3,934)	3,934
Share-based employee compensation expense:
EQR restricted shares								7,277
EQR share options								7,389
EQR ESPP discount								1,070
Offering costs								(2,770)
Net income available to Units - General Partner				780,704				780,704
OP Units - General Partner distributions								(299,383)
Supplemental Executive Retirement Plan (SERP)								10,198
Acquisition of Noncontrolling Interests - Partially Owned Properties			(8,025)				(8,025)	(4,784)
Change in market value of Redeemable Limited Partners								16,023
Equity compensation associated with Units - Limited Partners				2,734					2,734
Net income available to Units - Limited Partners				36,275					36,275
Units - Limited Partners distributions									(13,777)
Change in carrying value of Redeemable Limited Partners									(11,281)
Adjustment for Limited Partners ownership in Operating Partnership								(597)	597
Accumulated other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(130,367)	(130,367)		(130,367)		(130,367)
Accumulated other comprehensive income	2,842	2,842		2,842		2,842
Accumulated other comprehensive income - other instruments:
Unrealized holding gains (losses) arising during the period						311
Net income attributable to Noncontrolling Interests							418
Contributions by Noncontrolling Interests			64				64
Distributions to Noncontrolling Interests			(922)	(13,777)			(922)
Other							(1,240)
Balance, end of period at Sep. 30, 2011					200,000	(185,032)	(1,714)	5,720,731	120,786
Balance, beginning of year at Jun. 30, 2011
Share-based employee compensation expense:
Net income available to Units - General Partner				104,382
Net income available to Units - Limited Partners				4,742
Accumulated other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(105,248)			(105,248)
Accumulated other comprehensive income	951			951
Balance, end of period at Sep. 30, 2011					$ 200,000

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2011

Summary of Significant Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X promulgated under the Securities Act of 1933, as amended. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Certain reclassifications have been made to the prior period financial statements in order to conform to the current year presentation. Operating results for the nine months ended September 30, 2011 are not necessarily indicative of the results that may be expected for the year ending December 31, 2011.

In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

The balance sheets at December 31, 2010 have been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in each of the Company’s and the Operating Partnership’s annual reports on Form 10-K for the year ended December 31, 2010.

Income and Other Taxes

Income and Other Taxes

Due to the structure of EQR as a REIT and the nature of the operations of its operating properties, no provision for federal income taxes has been made at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their proportionate share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected Taxable REIT Subsidiary (“TRS”) status for certain of its corporate subsidiaries and as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses.

Deferred tax assets and liabilities applicable to the TRS entities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. These assets and liabilities are measured using enacted tax rates for which the temporary differences are expected to be recovered or settled. The effects of changes in tax rates on deferred tax assets and liabilities are recognized in earnings in the period enacted. The Company’s deferred tax assets are generally the result of tax affected amortization of goodwill, differing depreciable lives on capitalized assets and the timing of expense recognition for certain accrued liabilities. As of September 30, 2011, the Company has recorded a deferred tax asset of approximately $38.7 million, which is fully offset by a valuation allowance due to the uncertainty in forecasting future TRS taxable income.

Other

Other

Effective January 1, 2010, in an effort to improve financial standards for transfers of financial assets, more stringent conditions for reporting a transfer of a portion of a financial asset as a sale (e.g. loan participations) are required, the concept of a “qualifying special-purpose entity” and special guidance for guaranteed mortgage securitizations are eliminated, other sale-accounting criteria is clarified and the initial measurement of a transferor’s interest in transferred financial assets is changed. This does not have a material effect on the Company’s consolidated results of operations or financial position.

Effective January 1, 2010, the analysis for identifying the primary beneficiary of a Variable Interest Entity (“VIE”) has been simplified by replacing the previous quantitative-based analysis with a framework that is based more on qualitative judgments. The analysis requires the primary beneficiary of a VIE to be identified as the party that both (a) has the power to direct the activities of a VIE that most significantly impact its economic performance and (b) has an obligation to absorb losses or a right to receive benefits that could potentially be significant to the VIE. For the Company, this includes its consolidated development partnerships as the Company provides substantially all of the capital for these ventures (other than third party mortgage debt, if any). For the Company, these requirements affected only disclosures and had no impact on the Company’s consolidated results of operations or financial position. See Note 6 for further discussion.

The Company is the controlling partner in various consolidated partnerships owning 21 properties and 3,916 apartment units and various completed and uncompleted development properties having a negative noncontrolling interest book value of $1.7 million at September 30, 2011. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated entities described above, the Company is the controlling partner in limited-life partnerships owning six properties. These six partnership agreements contain provisions that require the partnerships to be liquidated through the sale of their assets upon reaching a date specified in each respective partnership agreement. The Company, as controlling partner, has an obligation to cause the property owning partnerships to distribute the proceeds of liquidation to the Noncontrolling Interests in these Partially Owned Properties only to the extent that the net proceeds received by the partnerships from the sale of their assets warrant a distribution based on the partnership agreements. As of September 30, 2011, the Company estimates the value of Noncontrolling Interest distributions for these six properties would have been approximately $32.9 million (“Settlement Value”) had the partnerships been liquidated. This Settlement Value is based on estimated third party consideration realized by the partnerships upon disposition of the six Partially Owned Properties and is net of all other assets and liabilities, including yield maintenance on the mortgages encumbering the properties, that would have been due on September 30, 2011 had those mortgages been prepaid. Due to, among other things, the inherent uncertainty in the sale of real estate assets, the amount of any potential distribution to the Noncontrolling Interests in the Company’s Partially Owned Properties is subject to change. To the extent that the partnerships’ underlying assets are worth less than the underlying liabilities, the Company has no obligation to remit any consideration to the Noncontrolling Interests in these Partially Owned Properties.

Effective January 1, 2011, companies are required to separately disclose purchases, sales, issuances and settlements on a gross basis in the reconciliation of recurring Level 3 fair value measurements. This does not have a material effect on the Company’s consolidated results of operations or financial position. See Note 9 for further discussion.

Effective January 1, 2012, companies will be required to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), companies will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the Company’s valuation processes in determining fair value. In addition, companies will be required to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Companies will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. The Company does not expect this will have a material effect on its consolidated results of operations or financial position.

Effective January 1, 2009, issuers of certain convertible debt instruments that may be settled in cash on conversion were required to separately account for the liability and equity components of the instrument in a manner that reflects each issuer’s nonconvertible debt borrowing rate. As the Company was required to apply this retrospectively, the accounting for its $650.0 million 3.85% convertible unsecured notes that were issued in August 2006 with a final maturity in August 2026 was affected. On August 18, 2011, the Company redeemed these notes at par ($482.5 million was outstanding on August 18, 2011) and no premium was paid. The Company recognized $11.8 million and $13.9 million in interest expense related to the stated coupon rate of 3.85% for the nine months ended September 30, 2011 and 2010, respectively. The amount of the conversion option as of the date of issuance calculated by the Company using a 5.80% effective interest rate was $44.3 million and was amortized to interest expense over the expected life of the convertible notes (through the first put date on August 18, 2011). Total amortization of the cash discount and conversion option discount on the unsecured notes resulted in a reduction to earnings of approximately $5.0 million and $5.8 million, respectively, or $0.02 per share/Unit and $0.02 per share/Unit, respectively, for the nine months ended September 30, 2011 and 2010, and will result in a reduction to earnings of approximately $5.0 million or $0.02 per share/Unit during the full year of 2011. In addition, the Company decreased the January 1, 2009 balance of retained earnings (included in general partner’s capital in the Operating Partnership’s financial statements) by $27.0 million, decreased the January 1, 2009 balance of notes by $17.3 million and increased the January 1, 2009 balance of paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) by $44.3 million. The carrying amount of the conversion option remaining in paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) was $44.3 million at both September 30, 2011 and December 31, 2010. The cash and conversion option discounts were fully amortized at September 30, 2011 and the unamortized cash and conversion option discounts totaled $5.0 million at December 31, 2010.

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Real Estate (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Store Customers Apartment State Property MilitaryHouse	Sep. 30, 2010	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Sep. 30, 2010	Dec. 31, 2010
Table of Real Estate Owned
Land	$ 4,158,288		$ 4,158,288		$ 4,110,275
Depreciable property:
Buildings and improvements	13,822,345		13,822,345		13,995,121
Furniture, fixtures and equipment	1,233,225		1,233,225		1,231,391
Construction-in-progress	119,433		119,433		130,337
Land - Land held for development	205,476		205,476		235,247
Investment in real estate	19,538,767		19,538,767		19,702,371
Accumulated depreciation	(4,405,479)		(4,405,479)		(4,337,357)
Investment in real estate, net	15,133,288		15,133,288		15,365,014
Acquired Properties
Properties - acquired	10		10
Units - acquired			2,529
Purchase Price - acquired	731,948		731,948
Disposed Properties
Properties - disposed			45
Units - disposed			13,528
Sales Price - disposed			1,406,200
Real Estate (Textuals) [Abstract]
Net (gain) on sales of discontinued operations	76,864	9,285	(759,100)	(69,538)
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Projects under development [Member]
Depreciable property:
Land - Projects under development	26,772		26,772		28,260
Construction-in-progress	92,661		92,661		102,077
Land held for development [Member]
Depreciable property:
Construction-in-progress	43,121		43,121		36,782
Land - Land held for development	162,355		162,355		198,465
Rental Properties [Member]
Acquired Properties
Properties - acquired	10		10
Units - acquired			2,529
Purchase Price - acquired	701,748		701,748
Land Parcels (three) [Member]
Acquired Properties
Properties - acquired	0		0
Units - acquired			0
Purchase Price - acquired	18,450		18,450
Disposed Properties
Properties - disposed			0
Units - disposed			0
Sales Price - disposed			22,786
Other Properties [Member]
Acquired Properties
Properties - acquired	0		0
Units - acquired			0
Purchase Price - acquired	11,750		11,750
Consolidated Rental Properties [Member]
Disposed Properties
Properties - disposed			45
Units - disposed			13,528
Sales Price - disposed			$ 1,383,414

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Business (Details)	Sep. 30, 2011 Apartment State Property MilitaryHouse
Property/Unit schedule
Wholly Owned Properties	394
Wholly Owned Apartment Units	110,194
Partially Owned Consolidated Properties	21
Partially Owned Consolidated Apartment Units	3,916
Military Housing Properties	2
Military Housing Apartment Units	4,901
Total Properties	417
Total Apartment Units	119,011
Business (Textuals) [Abstract]
EQR's Ownership percentage in ERPOP	95.60%
Properties owned	417
States in which properties owned are located	15
Units owned	119,011

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Reportable Segments

9 Months Ended

Sep. 30, 2011

Reportable Segments [Abstract]

Reportable Segments

13. Reportable Segments

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by senior management. Senior management decides how resources are allocated and assesses performance on a monthly basis.

The Company’s primary business is the acquisition, development and management of multifamily residential properties, which includes the generation of rental and other related income through the leasing of apartment units to residents. Senior management evaluates the performance of each of our apartment communities individually and geographically, and both on a same store and non-same store basis; however, each of our apartment communities generally has similar economic characteristics, residents, products and services. The Company’s operating segments have been aggregated by geography in a manner identical to that which is provided to its chief operating decision maker.

The Company’s fee and asset management, development (including its partially owned properties) and condominium conversion activities are immaterial and do not individually meet the threshold requirements of a reportable segment and as such, have been aggregated in the “Other” segment in the tables presented below.

All revenues are from external customers and there is no customer who contributed 10% or more of the Company’s total revenues during the nine months and quarters ended September 30, 2011 and 2010, respectively.

The primary financial measure for the Company’s rental real estate segment is net operating income (“NOI”), which represents rental income less: 1) property and maintenance expense; 2) real estate taxes and insurance expense; and 3) property management expense (all as reflected in the accompanying consolidated statements of operations). The Company believes that NOI is helpful to investors as a supplemental measure of its operating performance because it is a direct measure of the actual operating results of the Company’s apartment communities. Current year NOI is compared to prior year NOI and current year budgeted NOI as a measure of financial performance. The following tables present NOI for each segment from our rental real estate specific to continuing operations for the nine months and quarters ended September 30, 2011 and 2010, respectively, as well as total assets at September 30, 2011 (amounts in thousands):

	Nine Months Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	440,444	$	255,986	$	266,938	$	320,840	$	—		$	1,284,208
Non-same store/other (2) (3)		113,008		28,544		11,283		30,069		3,286			186,190
Total rental income		553,452		284,530		278,221		350,909		3,286			1,470,398
Operating expenses:
Same store (1)		160,900		91,053		106,223		109,768		—			467,944
Non-same store/other (2) (3)		43,631		10,911		4,162		12,257		6,308			77,269
Total operating expenses		204,531		101,964		110,385		122,025		6,308			545,213
NOI:
Same store (1)		279,544		164,933		160,715		211,072		—			816,264
Non-same store/other (2) (3)		69,377		17,633		7,121		17,812		(3,022	)		108,921
Total NOI	$	348,921	$	182,566	$	167,836	$	228,884	$	(3,022	)	$	925,185
Total assets	$	6,313,643	$	2,656,529	$	2,514,066	$	3,230,549	$	1,042,030		$	15,756,817

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.3 million and other corporate operations.

	Nine Months Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	417,347	$	240,767	$	256,307	$	310,950	$	—		$	1,225,371
Non-same store/other (2) (3)		64,743		10,698		6,429		7,629		(3,493	)		86,006
Total rental income		482,090		251,465		262,736		318,579		(3,493	)		1,311,377
Operating expenses:
Same store (1)		158,351		91,045		106,245		113,510		—			469,151
Non-same store/other (2) (3)		34,241		4,531		2,728		3,490		9,852			54,842
Total operating expenses		192,592		95,576		108,973		117,000		9,852			523,993
NOI:
Same store (1)		258,996		149,722		150,062		197,440		—			756,220
Non-same store/other (2) (3)		30,502		6,167		3,701		4,139		(13,345	)		31,164
Total NOI	$	289,498	$	155,889	$	153,763	$	201,579	$	(13,345	)	$	787,384

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.4 million and other corporate operations.

	Quarter Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)		Total
Rental income:
Same store (1)	$	163,887	$	91,663	$	90,979	$	110,779	$	—	$	457,308
Non-same store/other (2) (3)		27,889		6,657		3,773		10,862		2,541		51,722
Total rental income		191,776		98,320		94,752		121,641		2,541		509,030
Operating expenses:
Same store (1)		59,736		32,455		35,861		38,160		—		166,212
Non-same store/other (2) (3)		9,163		2,645		1,250		4,351		1,338		18,747
Total operating expenses		68,899		35,100		37,111		42,511		1,338		184,959
NOI:
Same store (1)		104,151		59,208		55,118		72,619		—		291,096
Non-same store/other (2) (3)		18,726		4,012		2,523		6,511		1,203		32,975
Total NOI	$	122,877	$	63,220	$	57,641	$	79,130	$	1,203	$	324,071

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

	Quarter Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	155,119	$	84,969	$	86,963	$	106,457	$	—		$	433,508
Non-same store/other (2) (3)		12,963		2,158		2,002		2,537		(1,336	)		18,324
Total rental income		168,082		87,127		88,965		108,994		(1,336	)		451,832
Operating expenses:
Same store (1)		58,184		32,805		36,219		39,173		—			166,381
Non-same store/other (2) (3)		10,321		855		565		1,114		242			13,097
Total operating expenses		68,505		33,660		36,784		40,287		242			179,478
NOI:
Same store (1)		96,935		52,164		50,744		67,284		—			267,127
Non-same store/other (2) (3)		2,642		1,303		1,437		1,423		(1,578	)		5,227
Total NOI	$	99,577	$	53,467	$	52,181	$	68,707	$	(1,578	)	$	272,354

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

Note: Markets included in the above geographic segments are as follows:

(a) Northeast – New England (excluding Boston), Boston, New York Metro, DC Northern Virginia and Suburban Maryland.

(b) Northwest – Denver, Portland, San Francisco Bay Area and Seattle/Tacoma.

(c) Southeast – Atlanta, Jacksonville, Orlando and South Florida.

(d) Southwest – Inland Empire, Los Angeles, Orange County, Phoenix and San Diego.

The following table presents a reconciliation of NOI from our rental real estate specific to continuing operations for the nine months and quarters ended September 30, 2011 and 2010, respectively (amounts in thousands):

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Rental income	$	1,470,398		$	1,311,377		$	509,030		$	451,832
Property and maintenance expense		(314,768	)		(303,916	)		(106,635	)		(104,259	)
Real estate taxes and insurance expense		(168,056	)		(160,307	)		(59,083	)		(56,205	)
Property management expense		(62,389	)		(59,770	)		(19,241	)		(19,014	)
Total operating expenses		(545,213	)		(523,993	)		(184,959	)		(179,478	)
Net operating income	$	925,185		$	787,384		$	324,071		$	272,354

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Commitments to Acquire/Dispose of Real Estate

9 Months Ended

Sep. 30, 2011

Commitments to Acquire Dispose of Real Estate [Abstract]

Commitments to Acquire/Dispose of Real Estate

5. Commitments to Acquire/Dispose of Real Estate

In addition to the properties that were subsequently acquired as discussed in Note 14, the Company has entered into separate agreements to acquire the following (purchase price in thousands):

	Properties		Apartment Units		Purchase Price
Rental Properties		6		2,466	$	354,825
Land Parcels (seven)		—		—		157,987
Total		6		2,466	$	512,812

In addition to the property that was subsequently disposed of as discussed in Note 14, the Company has entered into separate agreements to dispose of the following (sales price in thousands):

	Properties		Apartment Units		Sales Price
Rental Properties		4		351	$	15,550
Total		4		351	$	15,550

The closings of these pending transactions are subject to certain conditions and restrictions, therefore, there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from those summarized in the preceding paragraphs.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive income (loss):
Net income	$ 112,977	$ 29,826	$ 827,796	$ 97,771
Other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(105,248)	(37,726)	(130,367)	(123,472)
Accumulated other comprehensive income	951	914	2,842	2,379
Other comprehensive income (loss) - other instruments:
Unrealized holding gains (losses) arising during the period	(182)	14	311	(52)
Other comprehensive (loss)	(104,479)	(36,798)	(127,214)	(121,145)
Comprehensive income (loss)	8,498	(6,972)	700,582	(23,374)
Comprehensive income (loss) attributable to controlling interests	3,369	(8,015)	663,889	(26,918)
OPERATING PARTNERSHIP
Comprehensive income (loss):
Net income	112,977	29,826	827,796	97,771
Other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(105,248)	(37,726)	(130,367)	(123,472)
Accumulated other comprehensive income	951	914	2,842	2,379
Other comprehensive income (loss) - other instruments:
Unrealized holding gains (losses) arising during the period	(182)	14	311	(52)
Other comprehensive (loss)	(104,479)	(36,798)	(127,214)	(121,145)
Comprehensive income (loss)	8,498	(6,972)	700,582	(23,374)
Comprehensive (income) loss attributable to Noncontrolling Interests - Partially Owned Properties	(387)	188	(418)	623
Comprehensive income (loss) attributable to controlling interests	$ 8,111	$ (6,784)	$ 700,164	$ (22,751)

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Earnings Per Share and Earnings Per Unit (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share and Earnings Per Unit [Abstract]

Computation of net income per share - basic and net income per share - diluted

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per share – basic:
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Allocation to Noncontrolling Interests – Operating Partnership, net		(1,648	)		2,042			(1,371	)		173
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests		35,443			(40,857	)		30,267			(3,551	)
Discontinued operations, net of Noncontrolling Interests		745,261			124,229			74,115			28,717
Numerator for net income per share – basic	$	780,704		$	83,372		$	104,382		$	25,166
Numerator for net income per share – diluted (1):
Income from continuing operations	$	47,908					$	35,491
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties		(418	)					(387	)
Preferred distributions		(10,399	)					(3,466	)
Income from continuing operations available to Common Shares		37,091						31,638
Discontinued operations, net		779,888						77,486
Numerator for net income per share – diluted (1)	$	816,979		$	83,372		$	109,124		$	25,166
Denominator for net income per share – basic and diluted (1):
Denominator for net income per share – basic		294,474			281,867			295,831			282,717
Effect of dilutive securities:
OP Units		13,231						13,053
Long-term compensation shares/units		4,203						3,960
Denominator for net income per share – diluted (1)		311,908			281,867			312,844			282,717
Net income per share – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per share – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per share – basic:
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net of Noncontrolling Interests		2.531			0.441			0.251			0.102
Net income per share – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per share – diluted (1):
Income (loss) from continuing operations available to Common Shares	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per share – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

Computation of net income per Unit - basic and net income per Unit - diluted

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per Unit – basic and diluted (1):
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Allocation to Preference Units		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Units		37,091			(42,899	)		31,638			(3,724	)
Discontinued operations, net		779,888			130,438			77,486			30,121
Numerator for net income per Unit – basic and diluted (1)	$	816,979		$	87,539		$	109,124		$	26,397
Denominator for net income per Unit – basic and diluted (1):
Denominator for net income per Unit – basic		307,705			295,572			308,884			296,348
Effect of dilutive securities:
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units		4,203						3,960
Denominator for net income per Unit – diluted (1)		311,908			295,572			312,844			296,348
Net income per Unit – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per Unit – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per Unit – basic:
Income (loss) from continuing operations available to Units	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net		2.531			0.441			0.251			0.102
Net income per Unit – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per Unit – diluted (1):
Income (loss) from continuing operations available to Units	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per Unit – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential Units issuable from the assumed exercise/vesting of the Company’s long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2011

Summary of Significant Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X promulgated under the Securities Act of 1933, as amended. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Certain reclassifications have been made to the prior period financial statements in order to conform to the current year presentation. Operating results for the nine months ended September 30, 2011 are not necessarily indicative of the results that may be expected for the year ending December 31, 2011.

In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

The balance sheets at December 31, 2010 have been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in each of the Company’s and the Operating Partnership’s annual reports on Form 10-K for the year ended December 31, 2010.

Income and Other Taxes

Due to the structure of EQR as a REIT and the nature of the operations of its operating properties, no provision for federal income taxes has been made at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their proportionate share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected Taxable REIT Subsidiary (“TRS”) status for certain of its corporate subsidiaries and as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses.

Deferred tax assets and liabilities applicable to the TRS entities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. These assets and liabilities are measured using enacted tax rates for which the temporary differences are expected to be recovered or settled. The effects of changes in tax rates on deferred tax assets and liabilities are recognized in earnings in the period enacted. The Company’s deferred tax assets are generally the result of tax affected amortization of goodwill, differing depreciable lives on capitalized assets and the timing of expense recognition for certain accrued liabilities. As of September 30, 2011, the Company has recorded a deferred tax asset of approximately $38.7 million, which is fully offset by a valuation allowance due to the uncertainty in forecasting future TRS taxable income.

Other

Effective January 1, 2010, in an effort to improve financial standards for transfers of financial assets, more stringent conditions for reporting a transfer of a portion of a financial asset as a sale (e.g. loan participations) are required, the concept of a “qualifying special-purpose entity” and special guidance for guaranteed mortgage securitizations are eliminated, other sale-accounting criteria is clarified and the initial measurement of a transferor’s interest in transferred financial assets is changed. This does not have a material effect on the Company’s consolidated results of operations or financial position.

Effective January 1, 2010, the analysis for identifying the primary beneficiary of a Variable Interest Entity (“VIE”) has been simplified by replacing the previous quantitative-based analysis with a framework that is based more on qualitative judgments. The analysis requires the primary beneficiary of a VIE to be identified as the party that both (a) has the power to direct the activities of a VIE that most significantly impact its economic performance and (b) has an obligation to absorb losses or a right to receive benefits that could potentially be significant to the VIE. For the Company, this includes its consolidated development partnerships as the Company provides substantially all of the capital for these ventures (other than third party mortgage debt, if any). For the Company, these requirements affected only disclosures and had no impact on the Company’s consolidated results of operations or financial position. See Note 6 for further discussion.

The Company is the controlling partner in various consolidated partnerships owning 21 properties and 3,916 apartment units and various completed and uncompleted development properties having a negative noncontrolling interest book value of $1.7 million at September 30, 2011. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated entities described above, the Company is the controlling partner in limited-life partnerships owning six properties. These six partnership agreements contain provisions that require the partnerships to be liquidated through the sale of their assets upon reaching a date specified in each respective partnership agreement. The Company, as controlling partner, has an obligation to cause the property owning partnerships to distribute the proceeds of liquidation to the Noncontrolling Interests in these Partially Owned Properties only to the extent that the net proceeds received by the partnerships from the sale of their assets warrant a distribution based on the partnership agreements. As of September 30, 2011, the Company estimates the value of Noncontrolling Interest distributions for these six properties would have been approximately $32.9 million (“Settlement Value”) had the partnerships been liquidated. This Settlement Value is based on estimated third party consideration realized by the partnerships upon disposition of the six Partially Owned Properties and is net of all other assets and liabilities, including yield maintenance on the mortgages encumbering the properties, that would have been due on September 30, 2011 had those mortgages been prepaid. Due to, among other things, the inherent uncertainty in the sale of real estate assets, the amount of any potential distribution to the Noncontrolling Interests in the Company’s Partially Owned Properties is subject to change. To the extent that the partnerships’ underlying assets are worth less than the underlying liabilities, the Company has no obligation to remit any consideration to the Noncontrolling Interests in these Partially Owned Properties.

Effective January 1, 2011, companies are required to separately disclose purchases, sales, issuances and settlements on a gross basis in the reconciliation of recurring Level 3 fair value measurements. This does not have a material effect on the Company’s consolidated results of operations or financial position. See Note 9 for further discussion.

Effective January 1, 2012, companies will be required to separately disclose the amounts and reasons for any transfers of assets and liabilities into and out of Level 1 and Level 2 of the fair value hierarchy. For fair value measurements using significant unobservable inputs (Level 3), companies will be required to disclose quantitative information about the significant unobservable inputs used for all Level 3 measurements and a description of the Company’s valuation processes in determining fair value. In addition, companies will be required to provide a qualitative discussion about the sensitivity of recurring Level 3 measurements to changes in the unobservable inputs disclosed, including the interrelationship between inputs. Companies will also be required to disclose information about when the current use of a non-financial asset measured at fair value differs from its highest and best use and the hierarchy classification for items whose fair value is not recorded on the balance sheet but is disclosed in the notes. The Company does not expect this will have a material effect on its consolidated results of operations or financial position.

Effective January 1, 2009, issuers of certain convertible debt instruments that may be settled in cash on conversion were required to separately account for the liability and equity components of the instrument in a manner that reflects each issuer’s nonconvertible debt borrowing rate. As the Company was required to apply this retrospectively, the accounting for its $650.0 million 3.85% convertible unsecured notes that were issued in August 2006 with a final maturity in August 2026 was affected. On August 18, 2011, the Company redeemed these notes at par ($482.5 million was outstanding on August 18, 2011) and no premium was paid. The Company recognized $11.8 million and $13.9 million in interest expense related to the stated coupon rate of 3.85% for the nine months ended September 30, 2011 and 2010, respectively. The amount of the conversion option as of the date of issuance calculated by the Company using a 5.80% effective interest rate was $44.3 million and was amortized to interest expense over the expected life of the convertible notes (through the first put date on August 18, 2011). Total amortization of the cash discount and conversion option discount on the unsecured notes resulted in a reduction to earnings of approximately $5.0 million and $5.8 million, respectively, or $0.02 per share/Unit and $0.02 per share/Unit, respectively, for the nine months ended September 30, 2011 and 2010, and will result in a reduction to earnings of approximately $5.0 million or $0.02 per share/Unit during the full year of 2011. In addition, the Company decreased the January 1, 2009 balance of retained earnings (included in general partner’s capital in the Operating Partnership’s financial statements) by $27.0 million, decreased the January 1, 2009 balance of notes by $17.3 million and increased the January 1, 2009 balance of paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) by $44.3 million. The carrying amount of the conversion option remaining in paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) was $44.3 million at both September 30, 2011 and December 31, 2010. The cash and conversion option discounts were fully amortized at September 30, 2011 and the unamortized cash and conversion option discounts totaled $5.0 million at December 31, 2010.

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Deposits - Restricted

9 Months Ended

Sep. 30, 2011

Deposits - Restricted [Abstract]

Deposits - Restricted

7. Deposits – Restricted

The following table presents the Company’s restricted deposits as of September 30, 2011 and December 31, 2010 (amounts in thousands):

	September 30, 2011		December 31, 2010
Tax–deferred (1031) exchange proceeds	$	303,762	$	103,887
Earnest money on pending acquisitions		19,559		9,264
Restricted deposits on debt		2,371		18,966
Resident security and utility deposits		39,421		40,745
Other		4,348		8,125
Totals	$	369,461	$	180,987

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Equity, Capital and other Interests

9 Months Ended

Sep. 30, 2011

Equity, Capital and other Interests [Abstract]

Equity, Capital and other Interests

3. Equity, Capital and Other Interests

Equity and Redeemable Noncontrolling Interests of Equity Residential

The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and Long-Term Incentive Plan (“LTIP”) Units) for the nine months ended September 30, 2011:

	2011
Common Shares
Common Shares outstanding at January 1,		290,197,242
Common Shares Issued:
Conversion of OP Units		324,649
Issuance of Common Shares		3,038,980
Exercise of share options		2,914,476
Employee Share Purchase Plan (ESPP)		98,766
Restricted share grants, net		148,708
Common Shares Other:
Conversion of restricted shares to LTIP Units		(101,988	)
Common Shares outstanding at September 30,		296,620,833
Units
Units outstanding at January 1,		13,612,037
LTIP Units, net		120,112
Conversion of restricted shares to LTIP Units		101,988
Conversion of OP Units to Common Shares		(324,649	)
Units outstanding at September 30,		13,509,488
Total Common Shares and Units outstanding at September 30,		310,130,321
Units Ownership Interest in Operating Partnership		4.4	%

The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of LTIP Units, are collectively referred to as the “Noncontrolling Interests – Operating Partnership”. Subject to certain exceptions (including the “book-up” requirements of LTIP Units), the Noncontrolling Interests – Operating Partnership may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership Units in total in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total plus the number of Common Shares. Net income is allocated to the Noncontrolling Interests – Operating Partnership based on the weighted average ownership percentage during the period.

The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Noncontrolling Interests – Operating Partnership Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interests – Operating Partnership Units for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interests – Operating Partnership Units.

The Noncontrolling Interests – Operating Partnership Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Noncontrolling Interests – Operating Partnership are differentiated and referred to as “Redeemable Noncontrolling Interests – Operating Partnership”. Instruments that require settlement in registered shares can not be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Noncontrolling Interests – Operating Partnership are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Noncontrolling Interests – Operating Partnership Units that are classified in permanent equity at September 30, 2011 and December 31, 2010.

The carrying value of the Redeemable Noncontrolling Interests – Operating Partnership is allocated based on the number of Redeemable Noncontrolling Interests – Operating Partnership Units in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total. Such percentage of the total carrying value of Units which is ascribed to the Redeemable Noncontrolling Interests – Operating Partnership is then adjusted to the greater of carrying value or fair market value as described above. As of September 30, 2011, the Redeemable Noncontrolling Interests – Operating Partnership have a redemption value of approximately $378.8 million, which represents the value of Common Shares that would be issued in exchange with the Redeemable Noncontrolling Interests – Operating Partnership Units.

The following table presents the change in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the nine months ended September 30, 2011 (amounts in thousands):

	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

Net proceeds from EQR Common Share and Preferred Share (see definition below) offerings are contributed by EQR to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the Preferred Shares issued in the equity offering). As a result, the net offering proceeds from Common Shares and Preferred Shares are allocated between shareholders’ equity and Noncontrolling Interests – Operating Partnership to account for the change in their respective percentage ownership of the underlying equity of ERPOP.

The Company’s declaration of trust authorizes it to issue up to 100,000,000 preferred shares of beneficial interest, $0.01 par value per share (the “Preferred Shares”), with specific rights, preferences and other attributes as the Board of Trustees may determine, which may include preferences, powers and rights that are senior to the rights of holders of the Company’s Common Shares.

The following table presents the Company’s issued and outstanding Preferred Shares as of September 30, 2011 and December 31, 2010:

			Annual		Amounts in thousands
	Redemption Date (1)		Dividend per Share (2)		September 30, 2011		December 31, 2010
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized:
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 1,000,000 shares issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preferred; liquidation value $250 per share; 600,000 shares issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preferred shares (Series K and N) may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.

(2) Dividends on all series of Preferred Shares are payable quarterly at various pay dates. The dividend listed for Series N is a Preferred Share rate and the equivalent Depositary Share annual dividend is $1.62 per share.

(3) The Series N Preferred Shares have a corresponding depositary share that consists of ten times the number of shares and one-tenth the liquidation value and dividend per share.

Capital and Redeemable Limited Partners of ERP Operating Limited Partnership

The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the nine months ended September 30, 2011:

	2011
General and Limited Partner Units
General and Limited Partner Units outstanding at January 1,		303,809,279
Issued to General Partner:
Issuance of OP Units		3,038,980
Exercise of EQR share options		2,914,476
EQR’s Employee Share Purchase Plan (ESPP)		98,766
EQR restricted share grants, net		148,708
Issued to Limited Partners:
LTIP Units, net		120,112
General and Limited Partner Units outstanding at September 30,		310,130,321
Limited Partner Units
Limited Partner Units outstanding at January 1,		13,612,037
Limited Partner LTIP Units, net		120,112
Conversion of EQR restricted shares to LTIP Units		101,988
Conversion of Limited Partner OP Units to EQR Common Shares		(324,649	)
Limited Partner Units outstanding at September 30,		13,509,488
Limited Partner Units Ownership Interest in Operating Partnership		4.4	%

The Limited Partners of the Operating Partnership as of September 30, 2011 include various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of LTIP Units. Subject to certain exceptions (including the “book-up” requirements of LTIP Units), Limited Partners may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Limited Partner Units (including redeemable interests) is allocated based on the number of Limited Partner Units in total in proportion to the number of Limited Partner Units in total plus the number of General Partner Units. Net income is allocated to the Limited Partner Units based on the weighted average ownership percentage during the period.

The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Limited Partner Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Limited Partner Units for cash, EQR is obligated to deliver Common Shares to the exchanging limited partner.

The Limited Partner Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Limited Partner Units are differentiated and referred to as “Redeemable Limited Partner Units”. Instruments that require settlement in registered shares can not be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Limited Partner Units are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Limited Partner Units that are classified in permanent equity at September 30, 2011 and December 31, 2010.

The carrying value of the Redeemable Limited Partner Units is allocated based on the number of Redeemable Limited Partner Units in proportion to the number of Limited Partner Units in total. Such percentage of the total carrying value of Limited Partner Units which is ascribed to the Redeemable Limited Partner Units is then adjusted to the greater of carrying value or fair market value as described above. As of September 30, 2011, the Redeemable Limited Partner Units have a redemption value of approximately $378.8 million, which represents the value of Common Shares that would be issued in exchange with the Redeemable Limited Partner Units.

The following table presents the change in the redemption value of the Redeemable Limited Partners for the nine months ended September 30, 2011 (amounts in thousands):

	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

EQR contributes all net proceeds from its various equity offerings (including proceeds from exercise of options for Common Shares) to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the preferred shares issued in the equity offering).

The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of September 30, 2011 and December 31, 2010:

	Redemption Date (1)		Annual Dividend per Unit (2)		Amounts in thousands
					September 30, 2011		December 31, 2010
Preference Units:
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 1,000,000 units issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preference Units; liquidation value $250 per unit; 600,000 units issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preference units (Series K and N) may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares.

(2) Dividends on all series of Preference Units are payable quarterly at various pay dates. The dividend listed for Series N is a Preference Unit rate and the equivalent depositary unit annual dividend is $1.62 per unit.

(3) The Series N Preference Units have a corresponding depositary unit that consists of ten times the number of units and one-tenth the liquidation value and dividend per unit.

Other

In September 2009, EQR announced the establishment of an At-The-Market (“ATM”) share offering program which would allow EQR to sell up to 17.0 million Common Shares from time to time over the next three years into the existing trading market at current market prices as well as through negotiated transactions. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds from all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis). During the nine months ended September 30, 2011, EQR issued approximately 3.0 million Common Shares at an average price of $50.84 per share for total consideration of approximately $154.5 million through the ATM program. Concurrent with these transactions, ERPOP issued approximately 3.0 million OP Units to EQR. EQR has not issued any shares under this program since January 13, 2011. Including its February 2011 prospectus supplement which added approximately 5.7 million Common Shares, EQR has 10.0 million Common Shares remaining available for issuance under the ATM program as of September 30, 2011.

On June 16, 2011, the shareholders of EQR approved the Company’s 2011 Share Incentive Plan (the “2011 Plan”). The 2011 Plan reserved 12,980,741 Common Shares for issuance. In conjunction with the approval of the 2011 Plan, no further awards may be granted under the 2002 Share Incentive Plan. The 2011 Plan expires on June 16, 2021.

EQR has a share repurchase program authorized by the Board of Trustees under which it has authorization to repurchase up to $464.6 million of its shares as of September 30, 2011. No shares were repurchased during the nine months ended September 30, 2011.

During the nine months ended September 30, 2011, the Company acquired all of its partner’s interest in three consolidated partially owned properties consisting of 1,351 apartment units for $12.8 million. In conjunction with these transactions, the Company reduced paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements) by $4.8 million and Noncontrolling Interests – Partially Owned Properties by $8.0 million.

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Investments in Partially Owned Entities (Tables)

9 Months Ended

Sep. 30, 2011

Investments in Partially Owned Entities [Abstract]

Partially Owned Property Balance Sheet Schedule

	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development		Completed and Stabilized			Other			Total
Total projects (1)		—		2			19			21
Total apartments units (1)		—		441			3,475			3,916
Balance sheet information at 9/30/11 (at 100%):
ASSETS
Investment in real estate	$	25,071	$	114,570		$	447,939		$	587,580
Accumulated depreciation		—		(11,186	)		(140,444	)		(151,630	)
Investment in real estate, net		25,071		103,384			307,495			435,950
Cash and cash equivalents		1,643		1,578			11,078			14,299
Deposits – restricted		—		2,367			15,177			17,544
Escrow deposits – mortgage		—		50			—			50
Deferred financing costs, net		—		119			1,187			1,306
Other assets		89		132			136			357
Total assets	$	26,803	$	107,630		$	335,073		$	469,506
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable	$	—	$	84,153		$	200,337		$	284,490
Accounts payable & accrued expenses		179		1,327			2,960			4,466
Accrued interest payable		—		258			720			978
Other liabilities		1,274		47			2,862			4,183
Security deposits		—		110			1,482			1,592
Total liabilities		1,453		85,895			208,361			295,709
Noncontrolling Interests – Partially Owned Properties		2,243		1,079			(5,036	)		(1,714	)
Company equity/General and Limited Partners’ Capital		23,107		20,656			131,748			175,511
Total equity/capital		25,350		21,735			126,712			173,797
Total liabilities and equity/capital	$	26,803	$	107,630		$	335,073		$	469,506
Debt – Secured (2):
Company/Operating Partnership Ownership (3)	$	—	$	84,153		$	159,068		$	243,221
Noncontrolling Ownership		—		—			41,269			41,269
Total (at 100%)	$	—	$	84,153		$	200,337		$	284,490

(1) Project and apartment unit counts exclude all uncompleted development projects until those projects are substantially completed.

(2) All debt is non-recourse to the Company.

(3) Represents the Company’s/Operating Partnership’s current economic ownership interest.

Partially Owned Property Income Statement Schedule

	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development			Completed and Stabilized			Other			Total
Operating information for the nine months ended 9/30/11 (at 100%):
Operating revenue	$	—		$	6,649		$	43,016		$	49,665
Operating expenses		207			3,083			14,487			17,777
Net operating (loss) income		(207	)		3,566			28,529			31,888
Depreciation		—			3,121			11,256			14,377
General and administrative/other		115			6			50			171
Operating (loss) income		(322	)		439			17,223			17,340
Interest and other income		5			5			10			20
Other expenses		(289	)		—			(39	)		(328	)
Interest:
Expense incurred, net		(399	)		(2,465	)		(8,948	)		(11,812	)
Amortization of deferred financing costs		—			(202	)		(341	)		(543	)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations		(1,005	)		(2,223	)		7,905			4,677
Income and other tax (expense) benefit		(57	)		—			(6	)		(63	)
Net gain on sales of land parcels		4,217			—			—			4,217
Net gain on sales of discontinued operations		169			—			13,265			13,434
Net income (loss)	$	3,324		$	(2,223	)	$	21,164		$	22,265

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Business

9 Months Ended

Sep. 30, 2011

Business [Abstract]

Business

1. Business

Equity Residential (“EQR”), a Maryland real estate investment trust (“REIT”) formed in March 1993, is an S&P 500 company focused on the acquisition, development and management of high quality apartment properties in top United States growth markets. ERP Operating Limited Partnership (“ERPOP”), an Illinois limited partnership, was formed in May 1993 to conduct the multifamily residential property business of Equity Residential. EQR has elected to be taxed as a REIT. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP. Unless otherwise indicated, the notes to consolidated financial statements apply to both the Company and the Operating Partnership.

EQR is the general partner of, and as of September 30, 2011 owned an approximate 95.6% ownership interest in ERPOP. All of the Company’s property ownership, development and related business operations are conducted through the Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR issues public equity from time to time but does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity.

As of September 30, 2011, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 417 properties located in 15 states and the District of Columbia consisting of 119,011 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties):

	Properties		Apartment Units
Wholly Owned Properties		394		110,194
Partially Owned Properties – Consolidated		21		3,916
Military Housing		2		4,901
		417		119,011

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Derivative and Other Fair Value Instruments (Details 2) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (1,940)	$ 9,842
Amount of Gain/ (Loss) Recognized in Income on Hedged Item	1,940	(9,842)
Interest Rate Swap [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Hedged Item	Fixed rate debt	Fixed rate debt
Interest Rate Swap [Member] | Interest Expense [Member]
Schedule of Location of Fair Value/Cash flow Hedges on Statement of Operations
Amount of Gain/(Loss) Recognized in Income on Derivative	(1,940)	9,842
Amount of Gain/ (Loss) Recognized in Income on Hedged Item	$ 1,940	$ (9,842)

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CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
REVENUES
Rental income	$ 509,030	$ 451,832	$ 1,470,398	$ 1,311,377
Fee and asset management	2,928	2,128	6,682	7,596
Total revenues	511,958	453,960	1,477,080	1,318,973
EXPENSES
Property and maintenance	106,635	104,259	314,768	303,916
Real estate taxes and insurance	59,083	56,205	168,056	160,307
Property management	19,241	19,014	62,389	59,770
Fee and asset management	1,250	679	3,207	4,242
Depreciation	164,552	158,318	482,039	457,822
General and administrative	10,121	10,221	32,462	31,029
Total expenses	360,882	348,696	1,062,921	1,017,086
Operating income	151,076	105,264	414,159	301,887
Interest and other income	5,317	201	6,608	5,045
Other expenses	(2,528)	(3,487)	(9,318)	(9,513)
Interest:
Expense incurred, net	(113,370)	(121,116)	(354,960)	(348,279)
Amortization of deferred financing costs	(4,721)	(2,437)	(12,129)	(7,729)
Income (loss) before income and other taxes, (loss) income from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations	35,774	(21,575)	44,360	(58,589)
Income and other tax (expense) benefit	(283)	(291)	(669)	(283)
(Loss) income from investments in unconsolidated entities		188		(735)
Net gain on sales of unconsolidated entities		22,544		28,101
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Income (loss) from continuing operations	35,491	(295)	47,908	(32,667)
Discontinued operations, net	77,486	30,121	779,888	130,438
Net income	112,977	29,826	827,796	97,771
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties	387	(188)	418	(623)
Net income attributable to controlling interests	107,848	28,783	791,103	94,227
OPERATING PARTNERSHIP
REVENUES
Rental income	509,030	451,832	1,470,398	1,311,377
Fee and asset management	2,928	2,128	6,682	7,596
Total revenues	511,958	453,960	1,477,080	1,318,973
EXPENSES
Property and maintenance	106,635	104,259	314,768	303,916
Real estate taxes and insurance	59,083	56,205	168,056	160,307
Property management	19,241	19,014	62,389	59,770
Fee and asset management	1,250	679	3,207	4,242
Depreciation	164,552	158,318	482,039	457,822
General and administrative	10,121	10,221	32,462	31,029
Total expenses	360,882	348,696	1,062,921	1,017,086
Operating income	151,076	105,264	414,159	301,887
Interest and other income	5,317	201	6,608	5,045
Other expenses	(2,528)	(3,487)	(9,318)	(9,513)
Interest:
Expense incurred, net	(113,370)	(121,116)	(354,960)	(348,279)
Amortization of deferred financing costs	(4,721)	(2,437)	(12,129)	(7,729)
Income (loss) before income and other taxes, (loss) income from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations	35,774	(21,575)	44,360	(58,589)
Income and other tax (expense) benefit	(283)	(291)	(669)	(283)
(Loss) income from investments in unconsolidated entities		188		(735)
Net gain on sales of unconsolidated entities		22,544		28,101
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Income (loss) from continuing operations	35,491	(295)	47,908	(32,667)
Discontinued operations, net	77,486	30,121	779,888	130,438
Net income	112,977	29,826	827,796	97,771
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties	387	(188)	418	(623)
Net income attributable to controlling interests	112,590	30,014	827,378	98,394
ALLOCATION OF NET INCOME:
Preference Units	3,466	3,617	10,399	10,855
General Partner	104,382	25,166	780,704	83,372
Limited Partners	4,742	1,231	36,275	4,167
Net income available to Units	$ 109,124	$ 26,397	$ 816,979	$ 87,539
Earnings per Unit - basic:
Income (loss) from continuing operations available to Units	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Net income available to Units	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Weighted average Units outstanding	308,884	296,348	307,705	295,572
Earnings per Unit - diluted:
Income (loss) from continuing operations available to Units	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Net income available to Units	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Weighted average Units outstanding	312,844	296,348	311,908	295,572
Distributions declared per Unit outstanding	$ 0.3375	$ 0.3375	$ 1.0125	$ 1.0125

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 827,796	$ 97,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	496,383	501,695
Amortization of deferred financing costs	12,769	7,981
Amortization of discounts and premiums on debt	144	1,454
Amortization of deferred settlements on derivative instruments	2,441	1,978
Write-off of pursuit costs	4,052	3,512
Income from technology investments	(4,537)
Loss from investments in unconsolidated entities		735
Distributions from unconsolidated entities - return on capital	318	61
Net (gain) on sales of unconsolidated entities		(28,101)
Net (gain) loss on sales of land parcels	(4,217)	1,161
Net (gain) on sales of discontinued operations	(759,100)	(69,538)
Loss on debt extinguishments		158
Unrealized loss on derivative instruments	0	1
Compensation paid with Company Common Shares	16,722	14,716
Changes in assets and liabilities:
Decrease in deposits - restricted	5,101	75
Decrease (increase) in other assets	3,239	(6,385)
Increase in accounts payable and accrued expenses	60,608	66,070
(Decrease) in accrued interest payable	(28,736)	(31,257)
(Decrease) in other liabilities	(20,193)	(4,150)
Increase in security deposits	1,261	2,744
Net cash provided by operating activities	614,051	560,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate - acquisitions	(634,581)	(1,108,014)
Investment in real estate - development/other	(93,761)	(98,282)
Improvements to real estate	(106,070)	(98,959)
Additions to non-real estate property	(4,879)	(1,022)
Interest capitalized for real estate and unconsolidated entities under development	(5,931)	(10,196)
Proceeds from disposition of real estate, net	1,402,475	134,603
Investments in unconsolidated entities	(865)
Distributions from unconsolidated entities - return of capital		26,924
Proceeds from sale of investment securities		25,000
Proceeds from technology investments	4,537
(Increase) decrease in deposits on real estate acquisitions, net	(210,170)	248,547
Decrease (increase) in mortgage deposits	1,916	(2,340)
Consolidation of previously unconsolidated properties		(26,854)
Deconsolidation of previously consolidated properties	28,360
Acquisition of Noncontrolling Interests - Partially Owned Properties	(12,809)	(1,936)
Net cash provided by (used for) investing activities	368,222	(912,529)
CASH FLOWS FROM FINANCING ACTIVITIES:
Loan and bond acquisition costs	(8,070)	(7,897)
Mortgage notes payable:
Proceeds	152,930	124,020
Restricted cash	16,595	36,411
Lump sum payoffs	(859,066)	(491,100)
Scheduled principal repayments	(12,463)	(12,508)
(Loss) on debt extinguishments		(158)
Notes, net:
Proceeds		595,422
Lump sum payoffs	(575,641)
Lines of credit:
Proceeds	213,000	4,375,125
Repayments	(187,000)	(4,229,125)
(Payments on) settlement of derivative instruments		(10,040)
Proceeds from sale of Common Shares	154,508	73,356
Proceeds from Employee Share Purchase Plan (ESPP)	4,558	4,251
Proceeds from exercise of options	94,373	57,933
Common Shares repurchased and retired		(1,887)
Payment of offering costs	(2,770)	(730)
Other financing activities, net	(33)	(33)
Contributions - Noncontrolling Interests - Partially Owned Properties	64	222
Distributions:
Common Shares	(331,928)	(284,185)
Preferred Shares	(10,399)	(10,858)
Noncontrolling Interests - Operating Partnership	(15,464)	(14,187)
Noncontrolling Interests - Partially Owned Properties	(889)	(1,812)
Net cash (used for) provided by financing activities	(1,367,695)	202,220
Net (decrease) in cash and cash equivalents	(385,422)	(149,628)
Cash and cash equivalents, beginning of period	431,408	193,288
Cash and cash equivalents, end of period	45,986	43,660
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	381,194	377,467
Net cash paid (received) for income and other taxes	607	(2,892)
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	99,131	338,196
Valuation of OP Units issued		7,433
Mortgage loans (assumed) by purchaser		(39,999)
Amortization of deferred financing costs:
Investment in real estate, net		(1,824)
Deferred financing costs, net	12,769	9,805
Amortization of discounts and premiums on debt:
Mortgage notes payable	(6,116)	(5,048)
Notes, net	6,260	6,502
Amortization of deferred settlements on derivative instruments:
Other liabilities	(401)	(401)
Accumulated other comprehensive income	2,842	2,379
Unrealized loss on derivative instruments:
Other assets	5,217	13,788
Mortgage notes payable	(464)	6
Notes, net	(1,476)	9,835
Other liabilities	127,090	99,844
Accumulated other comprehensive (loss)	(130,367)	(123,472)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(5,760)	(10,196)
Investments in unconsolidated entities	(171)
Consolidation of previously unconsolidated properties:
Investment in real estate, net		(105,065)
Investments in unconsolidated entities		7,376
Deposits - restricted		(42,633)
Mortgage notes payable		112,631
Net other assets recorded		837
Deconsolidation of previously consolidated properties:
Investment in real estate, net	35,495
Investments in unconsolidated entities	(7,135)
(Payments on) settlement of derivative instruments:
Other liabilities		(10,040)
Other:
Receivable on sale of Common Shares		37,550
Transfer from notes, net to mortgage notes payable		$ 35,600

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Equity, Capital and other Interests (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Common Shares
Common Shares outstanding at January 1,	290,197,242
Common Shares Issued:
Conversion of OP Units	324,649
Issuance of Common Shares	3,038,980
Exercise of share options	2,914,476
Employee Share Purchase Plan (ESPP)	98,766
Restricted share grants, net	148,708
Common Shares Other:
Conversion of restricted shares to LTIP Units	(101,988)
Common Shares outstanding at September 30,	296,620,833
Units
Units outstanding at January 1,	13,612,037
LTIP Units, net	120,112
Conversion of restricted shares to LTIP Units	101,988
Conversion of OP Units to Common Shares	(324,649)
Units outstanding at September 30,	310,130,321
Units Ownership Interest in Operating Partnership	4.40%
EQR restricted share grants, net	148,708
Redeemable noncontrolling interests rollforward
Balance at January 1	$ 383,540
Change in market value	(16,023)
Change in carrying value	11,281
Balance at September 30,	378,798
OPERATING PARTNERSHIP
Redeemable noncontrolling interests rollforward
Change in carrying value	11,281
Balance at September 30,	378,800
OPERATING PARTNERSHIP | General And Limited Partner [Member]
Common Shares
Common Shares outstanding at January 1,	303,809,279
Units
Total Common Shares and Units outstanding at September 30,	310,130,321
OPERATING PARTNERSHIP | GENERAL PARTNER
Common Shares Issued:
Issuance of Common Shares	3,038,980
Restricted share grants, net	148,708
Units
LTIP Units, net	120,112
Exercise of EQR share options	2,914,476
Employee Share Purchase Plan (ESPP)	98,766
EQR restricted share grants, net	148,708
OPERATING PARTNERSHIP | LIMITED PARTNERS
Units
Units outstanding at January 1,	13,612,037
LTIP Units, net	120,112
Conversion of restricted shares to LTIP Units	101,988
Conversion of OP Units to Common Shares	(324,649)
Units outstanding at September 30,	13,509,488
Units Ownership Interest in Operating Partnership	4.40%
Redeemable noncontrolling interests rollforward
Balance at January 1	383,540
Change in market value	(16,023)
Change in carrying value	11,281
Balance at September 30,	$ 378,798

XML

Commitments to Acquire/Dispose of Real Estate (Tables)

9 Months Ended

Sep. 30, 2011

Commitments to Acquire Dispose of Real Estate [Abstract]

Real estate to be acquired

	Properties		Apartment Units		Purchase Price
Rental Properties		6		2,466	$	354,825
Land Parcels (seven)		—		—		157,987
Total		6		2,466	$	512,812

Real estate to be dispose of

	Properties		Apartment Units		Sales Price
Rental Properties		4		351	$	15,550
Total		4		351	$	15,550

XML

Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
REVENUES
Rental income	$ 3,764,000	$ 75,310,000	$ 87,279,000	$ 213,221,000
Total revenues	3,764,000	75,310,000	87,279,000	213,221,000
EXPENSES
Property and maintenance	2,202,000	31,051,000	46,177,000	85,544,000
Real estate taxes and insurance	151,000	5,619,000	5,369,000	17,162,000
Depreciation	901,000	15,701,000	14,344,000	43,873,000
General and administrative	2,000	13,000	49,000	32,000
Total expenses	3,256,000	52,384,000	65,939,000	146,611,000
Discontinued operating income	508,000	22,926,000	21,340,000	66,610,000
Interest and other income	42,000	7,000	140,000	640,000
Interest:
Expense incurred, net	(21,000)	(2,056,000)	(83,000)	(6,032,000)
Amortization of deferred financing costs	0	(28,000)	(640,000)	(252,000)
Income and other tax (expense) benefit	93,000	(13,000)	31,000	(66,000)
Discontinued operations	622,000	20,836,000	20,788,000	60,900,000
Net (gain) on sales of discontinued operations	76,864,000	9,285,000	(759,100,000)	(69,538,000)
Discontinued operations, net	77,486,000	30,121,000	779,888,000	130,438,000
Discontinued Operations (Textuals) [Abstract]
Investment in real estate, net of accumulated depreciation	623,700,000		623,700,000
Mortgage notes payable					$ 50,900,000

XML

Reportable Segments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Store Customers Apartment State Property MilitaryHouse	Sep. 30, 2010 Store Customers	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Sep. 30, 2010 Customers Store	Dec. 31, 2010
Rental income:
Rental income	$ 509,030,000	$ 451,832,000	$ 1,470,398,000	$ 1,311,377,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	184,959,000	179,478,000	545,213,000	523,993,000
NOI:
Net Operating Income	324,071,000	272,354,000	925,185,000	787,384,000
Total assets	15,756,817,000		15,756,817,000		16,184,194,000
Rental income	509,030,000	451,832,000	1,470,398,000	1,311,377,000
Reconciliation of NOI
Rental income	509,030,000	451,832,000	1,470,398,000	1,311,377,000
Property and maintenance expense	106,635,000	104,259,000	314,768,000	303,916,000
Real estate taxes and insurance expense	59,083,000	56,205,000	168,056,000	160,307,000
Property management expense	19,241,000	19,014,000	62,389,000	59,770,000
Operating expenses	(184,959,000)	(179,478,000)	(545,213,000)	(523,993,000)
Net Operating Income	324,071,000	272,354,000	925,185,000	787,384,000
Reportable Segments (Textuals) [Abstract]
Units in same store properties	104,922	104,922	102,129	102,129
Overhead Costs	100,000	100,000	300,000	400,000
Threshold limit of major customers	10.00%	10.00%	10.00%	10.00%
Number of customers accounted for threshold limit of major customers	0	0	0	0
Northeast [Member]
Rental income:
Rental income	191,776,000	168,082,000	553,452,000	482,090,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	68,899,000	68,505,000	204,531,000	192,592,000
NOI:
Net Operating Income	122,877,000	99,577,000	348,921,000	289,498,000
Total assets	6,313,643,000		6,313,643,000
Rental income	191,776,000	168,082,000	553,452,000	482,090,000
Reconciliation of NOI
Rental income	191,776,000	168,082,000	553,452,000	482,090,000
Operating expenses	(68,899,000)	(68,505,000)	(204,531,000)	(192,592,000)
Net Operating Income	122,877,000	99,577,000	348,921,000	289,498,000
Northeast [Member] | Same Store [Member]
Rental income:
Rental income	163,887,000	155,119,000	440,444,000	417,347,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	59,736,000	58,184,000	160,900,000	158,351,000
NOI:
Net Operating Income	104,151,000	96,935,000	279,544,000	258,996,000
Rental income	163,887,000	155,119,000	440,444,000	417,347,000
Reconciliation of NOI
Rental income	163,887,000	155,119,000	440,444,000	417,347,000
Operating expenses	(59,736,000)	(58,184,000)	(160,900,000)	(158,351,000)
Net Operating Income	104,151,000	96,935,000	279,544,000	258,996,000
Northeast [Member] | Non Same Store [Member]
Rental income:
Rental income	27,889,000	12,963,000	113,008,000	64,743,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	9,163,000	10,321,000	43,631,000	34,241,000
NOI:
Net Operating Income	18,726,000	2,642,000	69,377,000	30,502,000
Rental income	27,889,000	12,963,000	113,008,000	64,743,000
Reconciliation of NOI
Rental income	27,889,000	12,963,000	113,008,000	64,743,000
Operating expenses	(9,163,000)	(10,321,000)	(43,631,000)	(34,241,000)
Net Operating Income	18,726,000	2,642,000	69,377,000	30,502,000
Northwest [Member]
Rental income:
Rental income	98,320,000	87,127,000	284,530,000	251,465,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	35,100,000	33,660,000	101,964,000	95,576,000
NOI:
Net Operating Income	63,220,000	53,467,000	182,566,000	155,889,000
Total assets	2,656,529,000		2,656,529,000
Rental income	98,320,000	87,127,000	284,530,000	251,465,000
Reconciliation of NOI
Rental income	98,320,000	87,127,000	284,530,000	251,465,000
Operating expenses	(35,100,000)	(33,660,000)	(101,964,000)	(95,576,000)
Net Operating Income	63,220,000	53,467,000	182,566,000	155,889,000
Northwest [Member] | Same Store [Member]
Rental income:
Rental income	91,663,000	84,969,000	255,986,000	240,767,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	32,455,000	32,805,000	91,053,000	91,045,000
NOI:
Net Operating Income	59,208,000	52,164,000	164,933,000	149,722,000
Rental income	91,663,000	84,969,000	255,986,000	240,767,000
Reconciliation of NOI
Rental income	91,663,000	84,969,000	255,986,000	240,767,000
Operating expenses	(32,455,000)	(32,805,000)	(91,053,000)	(91,045,000)
Net Operating Income	59,208,000	52,164,000	164,933,000	149,722,000
Northwest [Member] | Non Same Store [Member]
Rental income:
Rental income	6,657,000	2,158,000	28,544,000	10,698,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	2,645,000	855,000	10,911,000	4,531,000
NOI:
Net Operating Income	4,012,000	1,303,000	17,633,000	6,167,000
Rental income	6,657,000	2,158,000	28,544,000	10,698,000
Reconciliation of NOI
Rental income	6,657,000	2,158,000	28,544,000	10,698,000
Operating expenses	(2,645,000)	(855,000)	(10,911,000)	(4,531,000)
Net Operating Income	4,012,000	1,303,000	17,633,000	6,167,000
Southeast [Member]
Rental income:
Rental income	94,752,000	88,965,000	278,221,000	262,736,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	37,111,000	36,784,000	110,385,000	108,973,000
NOI:
Net Operating Income	57,641,000	52,181,000	167,836,000	153,763,000
Total assets	2,514,066,000		2,514,066,000
Rental income	94,752,000	88,965,000	278,221,000	262,736,000
Reconciliation of NOI
Rental income	94,752,000	88,965,000	278,221,000	262,736,000
Operating expenses	(37,111,000)	(36,784,000)	(110,385,000)	(108,973,000)
Net Operating Income	57,641,000	52,181,000	167,836,000	153,763,000
Southeast [Member] | Same Store [Member]
Rental income:
Rental income	90,979,000	86,963,000	266,938,000	256,307,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	35,861,000	36,219,000	106,223,000	106,245,000
NOI:
Net Operating Income	55,118,000	50,744,000	160,715,000	150,062,000
Rental income	90,979,000	86,963,000	266,938,000	256,307,000
Reconciliation of NOI
Rental income	90,979,000	86,963,000	266,938,000	256,307,000
Operating expenses	(35,861,000)	(36,219,000)	(106,223,000)	(106,245,000)
Net Operating Income	55,118,000	50,744,000	160,715,000	150,062,000
Southeast [Member] | Non Same Store [Member]
Rental income:
Rental income	3,773,000	2,002,000	11,283,000	6,429,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	1,250,000	565,000	4,162,000	2,728,000
NOI:
Net Operating Income	2,523,000	1,437,000	7,121,000	3,701,000
Rental income	3,773,000	2,002,000	11,283,000	6,429,000
Reconciliation of NOI
Rental income	3,773,000	2,002,000	11,283,000	6,429,000
Operating expenses	(1,250,000)	(565,000)	(4,162,000)	(2,728,000)
Net Operating Income	2,523,000	1,437,000	7,121,000	3,701,000
Southwest [Member]
Rental income:
Rental income	121,641,000	108,994,000	350,909,000	318,579,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	42,511,000	40,287,000	122,025,000	117,000,000
NOI:
Net Operating Income	79,130,000	68,707,000	228,884,000	201,579,000
Total assets	3,230,549,000		3,230,549,000
Rental income	121,641,000	108,994,000	350,909,000	318,579,000
Reconciliation of NOI
Rental income	121,641,000	108,994,000	350,909,000	318,579,000
Operating expenses	(42,511,000)	(40,287,000)	(122,025,000)	(117,000,000)
Net Operating Income	79,130,000	68,707,000	228,884,000	201,579,000
Southwest [Member] | Same Store [Member]
Rental income:
Rental income	110,779,000	106,457,000	320,840,000	310,950,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	38,160,000	39,173,000	109,768,000	113,510,000
NOI:
Net Operating Income	72,619,000	67,284,000	211,072,000	197,440,000
Rental income	110,779,000	106,457,000	320,840,000	310,950,000
Reconciliation of NOI
Rental income	110,779,000	106,457,000	320,840,000	310,950,000
Operating expenses	(38,160,000)	(39,173,000)	(109,768,000)	(113,510,000)
Net Operating Income	72,619,000	67,284,000	211,072,000	197,440,000
Southwest [Member] | Non Same Store [Member]
Rental income:
Rental income	10,862,000	2,537,000	30,069,000	7,629,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	4,351,000	1,114,000	12,257,000	3,490,000
NOI:
Net Operating Income	6,511,000	1,423,000	17,812,000	4,139,000
Rental income	10,862,000	2,537,000	30,069,000	7,629,000
Reconciliation of NOI
Rental income	10,862,000	2,537,000	30,069,000	7,629,000
Operating expenses	(4,351,000)	(1,114,000)	(12,257,000)	(3,490,000)
Net Operating Income	6,511,000	1,423,000	17,812,000	4,139,000
Others [Member]
Rental income:
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Segment Reporting Information Operating Expenses Abstract
Operating expenses	1,338,000	242,000	6,308,000	9,852,000
NOI:
Net Operating Income	1,203,000	(1,578,000)	(3,022,000)	(13,345,000)
Total assets	1,042,030,000		1,042,030,000
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Reconciliation of NOI
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Operating expenses	(1,338,000)	(242,000)	(6,308,000)	(9,852,000)
Net Operating Income	1,203,000	(1,578,000)	(3,022,000)	(13,345,000)
Others [Member] | Non Same Store [Member]
Rental income:
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Segment Reporting Information Operating Expenses Abstract
Operating expenses	1,338,000	242,000	6,308,000	9,852,000
NOI:
Net Operating Income	1,203,000	(1,578,000)	(3,022,000)	(13,345,000)
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Reconciliation of NOI
Rental income	2,541,000	(1,336,000)	3,286,000	(3,493,000)
Operating expenses	(1,338,000)	(242,000)	(6,308,000)	(9,852,000)
Net Operating Income	1,203,000	(1,578,000)	(3,022,000)	(13,345,000)
Same Store [Member]
Rental income:
Rental income	457,308,000	433,508,000	1,284,208,000	1,225,371,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	166,212,000	166,381,000	467,944,000	469,151,000
NOI:
Net Operating Income	291,096,000	267,127,000	816,264,000	756,220,000
Rental income	457,308,000	433,508,000	1,284,208,000	1,225,371,000
Reconciliation of NOI
Rental income	457,308,000	433,508,000	1,284,208,000	1,225,371,000
Operating expenses	(166,212,000)	(166,381,000)	(467,944,000)	(469,151,000)
Net Operating Income	291,096,000	267,127,000	816,264,000	756,220,000
Non Same Store [Member]
Rental income:
Rental income	51,722,000	18,324,000	186,190,000	86,006,000
Segment Reporting Information Operating Expenses Abstract
Operating expenses	18,747,000	13,097,000	77,269,000	54,842,000
NOI:
Net Operating Income	32,975,000	5,227,000	108,921,000	31,164,000
Rental income	51,722,000	18,324,000	186,190,000	86,006,000
Reconciliation of NOI
Rental income	51,722,000	18,324,000	186,190,000	86,006,000
Operating expenses	(18,747,000)	(13,097,000)	(77,269,000)	(54,842,000)
Net Operating Income	$ 32,975,000	$ 5,227,000	$ 108,921,000	$ 31,164,000

XML

Derivative and Other Fair Value Instruments (Details 1) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Derivatives designated as hedging instruments:
Total	$ 78,530	$ 75,123
Derivatives designated as hedging instruments:
Total	232,613	97,210
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1)
Derivatives designated as hedging instruments:
Total	67,949	59,326
Derivatives designated as hedging instruments:
Total	66,444	58,132
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1) | Fair Value Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value	0
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1) | Forward Starting Swaps [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value	0
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1) | Other Assets [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	66,444	58,132
Available for sale investment securities	1,505	1,194
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1) | Other Liabilities [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	66,444	58,132
Quoted Priced in Active Markets for Identical Assets/ Liabilities (Level 1) | Mezzanine [Member]
Derivatives designated as hedging instruments:
Redeemable Noncontrolling interests - operating partnership/redeemable limited partners	0
Significant Other Observable Inputs (Level 2)
Derivatives designated as hedging instruments:
Total	10,581	15,797
Derivatives designated as hedging instruments:
Total	166,169	39,078
Significant Other Observable Inputs (Level 2) | Fair Value Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value	10,581	12,521
Significant Other Observable Inputs (Level 2) | Forward Starting Swaps [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value		3,276
Significant Other Observable Inputs (Level 2) | Forward Starting Swaps [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value	166,169	37,756
Significant Other Observable Inputs (Level 2) | Development Cash Flow Hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value		1,322
Significant Other Observable Inputs (Level 2) | Other Assets [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	0
Available for sale investment securities	0
Significant Other Observable Inputs (Level 2) | Other Liabilities [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	0
Significant Other Observable Inputs (Level 2) | Mezzanine [Member]
Derivatives designated as hedging instruments:
Redeemable Noncontrolling interests - operating partnership/redeemable limited partners	378,798	383,540
Significant Unobservable Inputs (Level 3)
Derivatives designated as hedging instruments:
Total	0
Derivatives designated as hedging instruments:
Total	0
Significant Unobservable Inputs (Level 3) | Other Assets [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value	0
Supplemental Executive Retirement Plan	0
Available for sale investment securities	0
Significant Unobservable Inputs (Level 3) | Other Liabilities [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value	0
Supplemental Executive Retirement Plan	0
Significant Unobservable Inputs (Level 3) | Mezzanine [Member]
Derivatives designated as hedging instruments:
Redeemable Noncontrolling interests - operating partnership/redeemable limited partners	0
Fair Value Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value	10,581	12,521
Forward Starting Swaps [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative asset, fair value		3,276
Forward Starting Swaps [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value	166,169	37,756
Development Cash Flow Hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments:
Derivative liability, fair value		1,322
Other Assets [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	66,444	58,132
Available for sale investment securities	1,505	1,194
Other Liabilities [Member]
Derivatives designated as hedging instruments:
Supplemental Executive Retirement Plan	66,444	58,132
Mezzanine [Member]
Derivatives designated as hedging instruments:
Redeemable Noncontrolling interests - operating partnership/redeemable limited partners	$ 378,798	$ 383,540

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 827,796	$ 97,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	496,383	501,695
Amortization of deferred financing costs	12,769	7,981
Amortization of discounts and premiums on debt	144	1,454
Amortization of deferred settlements on derivative instruments	2,441	1,978
Write-off of pursuit costs	4,052	3,512
Income from technology investments	(4,537)
Loss from investments in unconsolidated entities		735
Distributions from unconsolidated entities - return on capital	318	61
Net (gain) on sales of unconsolidated entities		(28,101)
Net (gain) loss on sales of land parcels	(4,217)	1,161
Net (gain) on sales of discontinued operations	(759,100)	(69,538)
Loss on debt extinguishments		158
Unrealized loss on derivative instruments	0	1
Compensation paid with Company Common Shares	16,722	14,716
Changes in assets and liabilities:
Decrease in deposits - restricted	5,101	75
Decrease (increase) in other assets	3,239	(6,385)
Increase in accounts payable and accrued expenses	60,608	66,070
(Decrease) in accrued interest payable	(28,736)	(31,257)
(Decrease) in other liabilities	(20,193)	(4,150)
Increase in security deposits	1,261	2,744
Net cash provided by operating activities	614,051	560,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate - acquisitions	(634,581)	(1,108,014)
Investment in real estate - development/other	(93,761)	(98,282)
Improvements to real estate	(106,070)	(98,959)
Additions to non-real estate property	(4,879)	(1,022)
Interest capitalized for real estate and unconsolidated entities under development	(5,931)	(10,196)
Proceeds from disposition of real estate, net	1,402,475	134,603
Investments in unconsolidated entities	(865)
Distributions from unconsolidated entities - return of capital		26,924
Proceeds from sale of investment securities		25,000
Proceeds from technology investments	4,537
(Increase) decrease in deposits on real estate acquisitions, net	(210,170)	248,547
Decrease (increase) in mortgage deposits	1,916	(2,340)
Consolidation of previously unconsolidated properties		(26,854)
Deconsolidation of previously consolidated properties	28,360
Acquisition of Noncontrolling Interests - Partially Owned Properties	(12,809)	(1,936)
Net cash provided by (used for) investing activities	368,222	(912,529)
CASH FLOWS FROM FINANCING ACTIVITIES:
Loan and bond acquisition costs	(8,070)	(7,897)
Mortgage notes payable:
Proceeds	152,930	124,020
Restricted cash	16,595	36,411
Lump sum payoffs	(859,066)	(491,100)
Scheduled principal repayments	(12,463)	(12,508)
(Loss) on debt extinguishments		(158)
Notes, net:
Proceeds		595,422
Lump sum payoffs	(575,641)
Lines of credit:
Repayments	(187,000)	(4,229,125)
(Payments on) settlement of derivative instruments		(10,040)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	4,558	4,251
Payment of offering costs	(2,770)	(730)
Other financing activities, net	(33)	(33)
Contributions - Noncontrolling Interests - Partially Owned Properties	64	222
Distributions:
Net cash (used for) provided by financing activities	(1,367,695)	202,220
Net (decrease) in cash and cash equivalents	(385,422)	(149,628)
Cash and cash equivalents, beginning of period	431,408	193,288
Cash and cash equivalents, end of period	45,986	43,660
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	381,194	377,467
Net cash paid (received) for income and other taxes	607	(2,892)
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	99,131	338,196
Valuation of OP Units issued		7,433
Mortgage loans (assumed) by purchaser		(39,999)
Amortization of deferred financing costs:
Investment in real estate, net		(1,824)
Deferred financing costs, net	12,769	9,805
Amortization of discounts and premiums on debt:
Mortgage notes payable	(6,116)	(5,048)
Notes, net	6,260	6,502
Amortization of deferred settlements on derivative instruments:
Other liabilities	(401)	(401)
Accumulated other comprehensive income	2,842	2,379
Unrealized loss on derivative instruments:
Other assets	5,217	13,788
Mortgage notes payable	(464)	6
Notes, net	(1,476)	9,835
Other liabilities	127,090	99,844
Accumulated other comprehensive (loss)	(130,367)	(123,472)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(5,760)	(10,196)
Investments in unconsolidated entities	(171)
Consolidation of previously unconsolidated properties:
Investment in real estate, net		(105,065)
Investments in unconsolidated entities		7,376
Deposits - restricted		(42,633)
Mortgage notes payable		112,631
Net other assets recorded		837
Deconsolidation of previously consolidated properties:
Investment in real estate, net	35,495
Investments in unconsolidated entities	(7,135)
(Payments on) settlement of derivative instruments:
Other liabilities		(10,040)
Other:
Transfer from notes, net to mortgage notes payable		35,600
OPERATING PARTNERSHIP
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	827,796	97,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	496,383	501,695
Amortization of deferred financing costs	12,769	7,981
Amortization of discounts and premiums on debt	144	1,454
Amortization of deferred settlements on derivative instruments	2,441	1,978
Write-off of pursuit costs	4,052	3,512
Income from technology investments	(4,537)
Loss from investments in unconsolidated entities		735
Distributions from unconsolidated entities - return on capital	318	61
Net (gain) on sales of unconsolidated entities		(28,101)
Net (gain) loss on sales of land parcels	(4,217)	1,161
Net (gain) on sales of discontinued operations	(759,100)	(69,538)
Loss on debt extinguishments		158
Unrealized loss on derivative instruments		1
Compensation paid with Company Common Shares	16,722	14,716
Changes in assets and liabilities:
Decrease in deposits - restricted	5,101	75
Decrease (increase) in other assets	3,239	(6,385)
Increase in accounts payable and accrued expenses	60,608	66,070
(Decrease) in accrued interest payable	(28,736)	(31,257)
(Decrease) in other liabilities	(20,193)	(4,150)
Increase in security deposits	1,261	2,744
Net cash provided by operating activities	614,051	560,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate - acquisitions	(634,581)	(1,108,014)
Investment in real estate - development/other	(93,761)	(98,282)
Improvements to real estate	(106,070)	(98,959)
Additions to non-real estate property	(4,879)	(1,022)
Interest capitalized for real estate and unconsolidated entities under development	(5,931)	(10,196)
Proceeds from disposition of real estate, net	1,402,475	134,603
Investments in unconsolidated entities	(865)
Distributions from unconsolidated entities - return of capital		26,924
Proceeds from sale of investment securities		25,000
Proceeds from technology investments	4,537
(Increase) decrease in deposits on real estate acquisitions, net	(210,170)	248,547
Decrease (increase) in mortgage deposits	1,916	(2,340)
Consolidation of previously unconsolidated properties		(26,854)
Deconsolidation of previously consolidated properties	28,360
Acquisition of Noncontrolling Interests - Partially Owned Properties	(12,809)	(1,936)
Net cash provided by (used for) investing activities	368,222	(912,529)
CASH FLOWS FROM FINANCING ACTIVITIES:
Loan and bond acquisition costs	(8,070)	(7,897)
Mortgage notes payable:
Proceeds	152,930	124,020
Restricted cash	16,595	36,411
Lump sum payoffs	859,066	491,100
Scheduled principal repayments	(12,463)	(12,508)
(Loss) on debt extinguishments		(158)
Notes, net:
Proceeds		595,422
Lump sum payoffs	(575,641)
Lines of credit:
Proceeds	213,000	4,375,125
Repayments	(187,000)	(4,229,125)
(Payments on) settlement of derivative instruments		(10,040)
Proceeds from sale of OP Units	154,508	73,356
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	4,558	4,251
Proceeds from exercise of EQR options	94,373	57,933
OP Units repurchased and retired		(1,887)
Payment of offering costs	(2,770)	(730)
Other financing activities, net	(33)	(33)
Contributions - Noncontrolling Interests - Partially Owned Properties	64	222
Distributions:
OP Units - General Partner	(331,928)	(284,185)
Preference Units	(10,399)	(10,858)
OP Units - Limited Partners	(15,464)	(14,187)
Noncontrolling Interests - Partially Owned Properties	(889)	(1,812)
Net cash (used for) provided by financing activities	(1,367,695)	202,220
Net (decrease) in cash and cash equivalents	(385,422)	(149,628)
Cash and cash equivalents, beginning of period	431,408	193,288
Cash and cash equivalents, end of period	45,986	43,660
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	381,194	377,467
Net cash paid (received) for income and other taxes	607	(2,892)
Real estate acquisitions/dispositions/other:
Mortgage loans assumed	99,131	338,196
Valuation of OP Units issued		7,433
Mortgage loans (assumed) by purchaser		(39,999)
Amortization of deferred financing costs:
Investment in real estate, net		(1,824)
Deferred financing costs, net	12,769	9,805
Amortization of discounts and premiums on debt:
Mortgage notes payable	(6,116)	(5,048)
Notes, net	6,260	6,502
Amortization of deferred settlements on derivative instruments:
Other liabilities	(401)	(401)
Accumulated other comprehensive income	2,842	2,379
Unrealized loss on derivative instruments:
Other assets	5,217	13,788
Mortgage notes payable	(464)	6
Notes, net	(1,476)	9,835
Other liabilities	127,090	99,844
Accumulated other comprehensive (loss)	(130,367)	(123,472)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(5,760)
Investments in unconsolidated entities	(171)
Consolidation of previously unconsolidated properties:
Investment in real estate, net		(105,065)
Investments in unconsolidated entities		7,376
Deposits - restricted		(42,633)
Mortgage notes payable		112,631
Net other assets recorded		837
Deconsolidation of previously consolidated properties:
Investment in real estate, net	35,495	(10,196)
Investments in unconsolidated entities	(7,135)
(Payments on) settlement of derivative instruments:
Other liabilities		(10,040)
Other:
Receivable on sale of OP Units		37,550
Transfer from notes, net to mortgage notes payable		$ 35,600

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Equity, Capital and other Interests (Details Textuals) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Sep. 30, 2010	Dec. 31, 2009	Jun. 16, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Common shares added to ATM program	5,700,000
Authorization to issue additional common shares	10,000,000
Acquired all of its partner's interest in 1,351 partially owned units	1,351
Reduction of paid in capital	$ 4,800,000
Reduction in partially owned properties	8,000,000
Partially owned development projects acquired from outside partner	3
Shares repurchased	0
Business Acquisition [Line Items]
Cost of acquiring properties	731,948,000
Equity, Capital and Other Interests (Textuals) [Abstract]
Basis for exchange units in operating partnerships of noncontrolling interest	one for one basis
Redemption value of approximately $378.8 million	378,798,000				383,540,000
100,000,000 authorized preferred shares	100,000,000				100,000,000
Preferred stock par value per share	$ 0.01				$ 0.01
Annual dividend of $1.62 per share	$ 1.62
Basis for exchangeable limited partnership units		one for one basis
Depository shares in relation to Preferred shares	ten times
May sell up to 17.0 million Common Shares			17,000,000
Years Company can trade existing Common Shares in market at current prices as well as through negotiated transactions			3 years
Basis for exchangeable operating partnerships units			One-for-one common Share per OP Unit basis
Number of shares authorized for issuance under 2011 plan				12,980,741
Authorized $464.6 million to be repurchased	464,600,000
Value of depository shares in relation to liquidation value and dividend per share	0.1
OPERATING PARTNERSHIP
Class of Stock [Line Items]
Common Stock issued during period, shares	3,000,000
Common Shares average price for total consideration through the ATM program	$ 50.84
Total consideration through ATM program	154,500,000
OP units issued by operating partnership	3,000,000
Depository units in relation to Preference Units	ten times
Annual dividend of $1.62 per Unit	$ 1.62
Value of depository units in relation to liquidation value and dividend per unit	0.1
Business Acquisition [Line Items]
Redemption value of approximately $378.8 million	378,800,000
Partially Owned Properties acquired [Member]
Business Acquisition [Line Items]
Cost of acquiring properties	$ 12,800,000

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Business (Tables)

9 Months Ended

Sep. 30, 2011

Business [Abstract]

Property/Unit schedule

	Properties		Apartment Units
Wholly Owned Properties		394		110,194
Partially Owned Properties – Consolidated		21		3,916
Military Housing		2		4,901
		417		119,011

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Deposits - Restricted (Tables)

9 Months Ended

Sep. 30, 2011

Deposits - Restricted [Abstract]

Schedule of Restricted Deposits

	September 30, 2011		December 31, 2010
Tax–deferred (1031) exchange proceeds	$	303,762	$	103,887
Earnest money on pending acquisitions		19,559		9,264
Restricted deposits on debt		2,371		18,966
Resident security and utility deposits		39,421		40,745
Other		4,348		8,125
Totals	$	369,461	$	180,987

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Equity, Capital and other Interests (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Preferred shares schedule
Preferred stock value	$ 200,000	$ 200,000
Shares issued	1,600,000	1,600,000
Shares outstanding	1,600,000	1,600,000
OPERATING PARTNERSHIP | 8.29% Series K Cumulative Redeemable Preferred [Member]
Preferred shares schedule
Redemption Date	Dec. 10, 2026
Annual dividend per preferred share/preference unit	$ 4.145
Preferred units value	50,000	50,000
8.29% Series K Cumulative Redeemable Preferred [Member]
Preferred shares schedule
Redemption Date	Dec. 10, 2026
Annual dividend per preferred share/preference unit	$ 4.145
Preferred stock value	50,000	50,000
Annual dividend rate	8.29%	8.29%
Liquidation value per share	$ 50	$ 50
Shares issued	1,000,000	1,000,000
Shares outstanding	1,000,000	1,000,000
OPERATING PARTNERSHIP | 6.48% Series N Cumulative Redeemable Preferred [Member]
Preferred shares schedule
Redemption Date	Jun. 19, 2008
Annual dividend per preferred share/preference unit	$ 16.20
Preferred units value	150,000	150,000
6.48% Series N Cumulative Redeemable Preferred [Member]
Preferred shares schedule
Redemption Date	Jun. 19, 2008
Annual dividend per preferred share/preference unit	$ 16.20
Preferred stock value	150,000	150,000
Annual dividend rate	6.48%	6.48%
Liquidation value per share	$ 250	$ 250
Shares issued	600,000	600,000
Shares outstanding	600,000	600,000
OPERATING PARTNERSHIP
Preferred shares schedule
Preferred units value	$ 200,000	$ 200,000

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Real Estate (Tables)

9 Months Ended

Sep. 30, 2011

Real Estate [Abstract]

Summarize the carrying amounts for the Company's investment in real estate (at cost)

	September 30, 2011			December 31, 2010
Land	$	4,158,288		$	4,110,275
Depreciable property:
Buildings and improvements		13,822,345			13,995,121
Furniture, fixtures and equipment		1,233,225			1,231,391
Projects under development:
Land		26,772			28,260
Construction-in-progress		92,661			102,077
Land held for development:
Land		162,355			198,465
Construction-in-progress		43,121			36,782
Investment in real estate		19,538,767			19,702,371
Accumulated depreciation		(4,405,479	)		(4,337,357	)
Investment in real estate, net	$	15,133,288		$	15,365,014

Acquired Properties

	Properties		Apartment Units		Purchase Price
Rental Properties – Consolidated		10		2,529	$	701,748
Land Parcels (three) (1)		—		—		18,450
Other (2)		—		—		11,750
Total		10		2,529	$	731,948

(1) Includes entry into a long-term ground lease for a land parcel in New York City.

(2) 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

	Properties		Apartment Units		Sales Price
Rental Properties – Consolidated		45		13,528	$	1,383,414
Land Parcel (one) (1)		—		—		22,786
Total		45		13,528	$	1,406,200

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

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Investments in Partially Owned Entities

9 Months Ended

Sep. 30, 2011

Investments in Partially Owned Entities [Abstract]

Investments in Partially Owned Entities

6. Investments in Partially Owned Entities

The Company has co-invested in various properties with unrelated third parties which are either consolidated or accounted for under the equity method of accounting (unconsolidated). The following tables and information summarize the Company’s investments in partially owned entities as of September 30, 2011 (amounts in thousands except for project and apartment unit amounts):

	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development		Completed and Stabilized			Other			Total
Total projects (1)		—		2			19			21
Total apartments units (1)		—		441			3,475			3,916
Balance sheet information at 9/30/11 (at 100%):
ASSETS
Investment in real estate	$	25,071	$	114,570		$	447,939		$	587,580
Accumulated depreciation		—		(11,186	)		(140,444	)		(151,630	)
Investment in real estate, net		25,071		103,384			307,495			435,950
Cash and cash equivalents		1,643		1,578			11,078			14,299
Deposits – restricted		—		2,367			15,177			17,544
Escrow deposits – mortgage		—		50			—			50
Deferred financing costs, net		—		119			1,187			1,306
Other assets		89		132			136			357
Total assets	$	26,803	$	107,630		$	335,073		$	469,506
LIABILITIES AND EQUITY/CAPITAL
Mortgage notes payable	$	—	$	84,153		$	200,337		$	284,490
Accounts payable & accrued expenses		179		1,327			2,960			4,466
Accrued interest payable		—		258			720			978
Other liabilities		1,274		47			2,862			4,183
Security deposits		—		110			1,482			1,592
Total liabilities		1,453		85,895			208,361			295,709
Noncontrolling Interests – Partially Owned Properties		2,243		1,079			(5,036	)		(1,714	)
Company equity/General and Limited Partners’ Capital		23,107		20,656			131,748			175,511
Total equity/capital		25,350		21,735			126,712			173,797
Total liabilities and equity/capital	$	26,803	$	107,630		$	335,073		$	469,506
Debt – Secured (2):
Company/Operating Partnership Ownership (3)	$	—	$	84,153		$	159,068		$	243,221
Noncontrolling Ownership		—		—			41,269			41,269
Total (at 100%)	$	—	$	84,153		$	200,337		$	284,490

	Consolidated
	Development Projects (VIEs)
	Held for and/or Under Development			Completed and Stabilized			Other			Total
Operating information for the nine months ended 9/30/11 (at 100%):
Operating revenue	$	—		$	6,649		$	43,016		$	49,665
Operating expenses		207			3,083			14,487			17,777
Net operating (loss) income		(207	)		3,566			28,529			31,888
Depreciation		—			3,121			11,256			14,377
General and administrative/other		115			6			50			171
Operating (loss) income		(322	)		439			17,223			17,340
Interest and other income		5			5			10			20
Other expenses		(289	)		—			(39	)		(328	)
Interest:
Expense incurred, net		(399	)		(2,465	)		(8,948	)		(11,812	)
Amortization of deferred financing costs		—			(202	)		(341	)		(543	)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations		(1,005	)		(2,223	)		7,905			4,677
Income and other tax (expense) benefit		(57	)		—			(6	)		(63	)
Net gain on sales of land parcels		4,217			—			—			4,217
Net gain on sales of discontinued operations		169			—			13,265			13,434
Net income (loss)	$	3,324		$	(2,223	)	$	21,164		$	22,265

(1) Project and apartment unit counts exclude all uncompleted development projects until those projects are substantially completed.

(2) All debt is non-recourse to the Company.

(3) Represents the Company’s/Operating Partnership’s current economic ownership interest.

The Company admitted an 80% institutional partner to two separate entities/transactions (one in December 2010 and the other in August 2011), each owning a developable land parcel, in exchange for $40.1 million in cash and retained a 20% equity interest in both of these entities. These land parcels are now unconsolidated. Total project costs are approximately $232.8 million and construction will be predominantly funded with long-term, non-recourse secured loans from the partner. While the Company is the managing member of both of the joint ventures, is responsible for constructing both of the projects and has given certain construction cost overrun guarantees, all major decisions are made jointly, the large majority of funding is provided by the partner and the partner has significant involvement in and oversight of the ongoing projects. The Company’s remaining funding obligations are currently estimated at approximately $6.6 million.

The Company is the controlling partner in various consolidated partnership properties and development properties having a negative noncontrolling interest book value of $1.7 million at September 30, 2011. The Company has identified its development partnerships as VIEs as the Company provides substantially all of the capital for these ventures (other than third party mortgage debt, if any) despite the fact that each partner legally owns 50% of each venture. The Company is the primary beneficiary as it exerts the most significant power over the ventures, absorbs the majority of the expected losses and has the right to receive a majority of the expected residual returns. The assets net of liabilities of the Company’s VIEs are restricted in their use to the specific VIE to which they relate and are not available for general corporate use. The Company does not have any unconsolidated VIEs.

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Earnings Per Share and Earnings Per Unit (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Aug. 18, 2011
Numerator for net income per Unit basic and diluted
Income (loss) from continuing operations	$ 35,491,000	$ (295,000)	$ 47,908,000	$ (32,667,000)
Allocation to Noncontrolling Interests - Operating Partnership, net	1,371,000	(173,000)	(1,648,000)	2,042,000
Partially Owned Properties	(387,000)	188,000	(418,000)	623,000
Preferred distributions	(3,466,000)	(3,617,000)	(10,399,000)	(10,855,000)
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests	30,267,000	(3,551,000)	35,443,000	(40,857,000)
Discontinued operations, net of Noncontrolling Interests	74,115,000	28,717,000	745,261,000	124,229,000
Net income available to Common Shares	104,382,000	25,166,000	780,704,000	83,372,000
Numerator for net income per share - diluted:
Income (loss) from continuing operations	35,491,000	(295,000)	47,908,000	(32,667,000)
Partially Owned Properties	(387,000)	188,000	(418,000)	623,000
Preferred distributions	(3,466,000)	(3,617,000)	(10,399,000)	(10,855,000)
Income from continuing operations available to common shares	31,638,000		37,091,000
Discontinued operations, net	77,486,000	30,121,000	779,888,000	130,438,000
Numerator for net income per share - diluted	109,124,000	25,166,000	816,979,000	83,372,000
Denominator for net income per share - basic and diluted:
Denominator for net income per share - basic	295,831,000	282,717,000	294,474,000	281,867,000
Effect of dilutive securities:
OP Units	13,053,000		13,231,000
Long-term compensation award shares/units	3,960,000		4,203,000
Denominator for net income per share - diluted	312,844,000	282,717,000	311,908,000	281,867,000
Net income per share - basic	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Net income per share - diluted	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Net income per share - basic:
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests	$ 0.102	$ (0.013)	$ 0.12	$ (0.145)
Discontinued operations, net of Noncontrolling Interests	$ 0.251	$ 0.102	$ 2.531	$ 0.441
Net income per share - basic	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Net income per share - diluted:
Income (loss) from continuing operations available to Common Shares	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Discontinued operations, net	$ 0.248	$ 0.102	$ 2.500	$ 0.441
Net income per share - diluted	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Earnings Per Share (Textuals) [Abstract]
Convertible preferred shares	0	393,724	0	396,098
Unsecured Notes, face amount	650,000,000		650,000,000
Convertible Notes, outstanding	$ 482,500,000		$ 482,500,000		$ 482,500,000

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Subsequent Events/Other (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Sep. 30, 2010	Dec. 31, 2010
Subsequent Events/Other (Textuals) [Abstract]
Amount available on the credit facility	$ 1,140,000,000		$ 1,140,000,000
Number of apartment property acquired			4
Number of apartment units acquired			1,000
Value of property acquired			253,900,000
Mortgage loans			12,800,000
Mortgage loan proceeds			38,000,000
Termination of royalty participation			4,500,000
Mortgage debt in conjunction with the acquisition of property			27,600,000
Number Of Properties Disposed Of			1
Number of apartment units sold			385
Value of property sold			30,100,000
Percentage of facility fee paid by the company			0.20%
Acquisition of properties			5,300,000	6,000,000
Write-off of pursuit costs			4,052,000	3,512,000
Other expenses	(2,528,000)	(3,487,000)	(9,318,000)	(9,513,000)
Insurance/Litigation Settlement proceeds				5,200,000
Estimates of lost revenue and garage reconstruction					11,000,000
Estimates Of Lost Revenue And Garage Reconstruction After Insurance Reimbursements					12,000,000
Initial insurance proceeds			2,700,000
Real estate tax and insurance			1,600,000
Net gain on the sale			1,000,000
Sale price of disposed corporate housing business			4,000,000
Loan amount provided to the buyer by the company			$ 2,000,000

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (USD $) In Thousands	Total	PREFERRED SHARES	COMMON SHARES, $0.01 PAR VALUE	PAID IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE (LOSS)	PARTIALLY OWNED PROPERTIES	OPERATING PARTNERSHIP	OPERATING PARTNERSHIP ACCUMULATED OTHER COMPREHENSIVE (LOSS)	OPERATING PARTNERSHIP PARTIALLY OWNED PROPERTIES	OPERATING PARTNERSHIP General Partner [Member]	OPERATING PARTNERSHIP Limited Partner [Member]
Beginning Balance at Dec. 31, 2010	$ 5,208,576	$ 200,000	$ 2,902	$ 4,741,521	$ 203,581	$ (57,818)	$ 7,991	$ 110,399
Common Share Issuance:
Conversion of OP Units into Common Shares			3	8,092				(8,095)
Issuance of Common Shares			30	154,478
Exercise of share options			29	94,344							94,373
Employee Share Purchase Plan (ESPP)			1	4,557							4,558
Conversion of restricted shares to LTIP Units			(1)	(3,933)				3,934			(3,934)	3,934
Share-based employee compensation expense:
Restricted shares			2	7,275
Share options				7,389							1,070
ESPP discount				1,070
Offering costs				(2,770)							(2,770)
Supplemental Executive Retirement Plan (SERP)				10,198							10,198
Acquisition of Noncontrolling Interests - Partially Owned Properties				(4,784)			(8,025)			(8,025)	(4,784)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(16,023)			16,023
Net income attributable to controlling interests	791,103				791,103			827,378
Common Share distributions					(299,383)
Preferred Share distributions					(10,399)
Accumulated other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(130,367)					(130,367)		(130,367)	(130,367)
Accumulated other comprehensive income	2,842					2,842		2,842	2,842
Accumulated other comprehensive income - other instruments:
Unrealized holding (losses) arising during the period	311					311		311
Equity compensation associated with Noncontrolling Interests								2,734				2,734
Net income attributable to Noncontrolling Interests	827,796						418	827,796
Contributions by Noncontrolling Interests							64			64
Distributions to Noncontrolling Interests							(922)	(13,777)		(922)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(11,281)							(11,281)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(597)				597
Other							(1,240)
Ending Balance at Sep. 30, 2011	5,854,771	200,000	2,966	5,032,863	684,902	(185,032)	(1,714)	120,786
Beginning Balance at Jun. 30, 2011
Share-based employee compensation expense:
Net income attributable to controlling interests	107,848							112,590
Accumulated other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(105,248)							(105,248)
Accumulated other comprehensive income	951							951
Accumulated other comprehensive income - other instruments:
Unrealized holding (losses) arising during the period	(182)							(182)
Net income attributable to Noncontrolling Interests	112,977							112,977
Ending Balance at Sep. 30, 2011	$ 5,854,771	$ 200,000						$ 120,786

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Derivative and Other Fair Value Instruments

9 Months Ended

Sep. 30, 2011

Derivative and Other Fair Value Instruments [Abstract]

Derivative and Other Fair Value Instruments

9. Derivative and Other Fair Value Instruments

The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments.

The carrying values of the Company’s mortgage notes payable and unsecured debt (including its line of credit) were approximately $4.1 billion and $4.6 billion, respectively, at September 30, 2011. The fair values of the Company’s mortgage notes payable and unsecured debt (including its line of credit) were approximately $4.4 billion and $5.0 billion, respectively, at September 30, 2011. The fair values of the Company’s financial instruments (other than mortgage notes payable, unsecured notes, lines of credit, derivative instruments and investment securities) including cash and cash equivalents and other financial instruments, approximate their carrying or contract values.

In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments.

The following table summarizes the Company’s consolidated derivative instruments at September 30, 2011 (dollar amounts are in thousands):

	Fair Value Hedges (1)			Forward Starting Swaps (2)
Current Notional Balance	$	315,693		$	950,000
Lowest Possible Notional	$	315,693		$	950,000
Highest Possible Notional	$	317,694		$	950,000
Lowest Interest Rate		2.009	%		3.478	%
Highest Interest Rate		4.800	%		4.695	%
Earliest Maturity Date		2012			2021
Latest Maturity Date		2013			2023

(1) Fair Value Hedges – Converts outstanding fixed rate debt to a floating interest rate.

(2) Forward Starting Swaps – Designed to partially fix the interest rate in advance of a planned future debt issuance. These swaps have mandatory counterparty terminations from 2012 through 2014, and $750.0 million and $200.0 million are targeted to 2012 and 2013 issuances, respectively.

In June 2011, the Company’s remaining development cash flow hedge matured.

A three-level valuation hierarchy exists for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels are defined as follows:

• Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

• Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

• Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement.

The Company’s derivative positions are valued using models developed by the respective counterparty as well as models developed internally by the Company that use as their basis readily observable market parameters (such as forward yield curves and credit default swap data). Employee holdings other than Common Shares within the supplemental executive retirement plan (the “SERP”) are valued using quoted market prices for identical assets and are included in other assets and other liabilities on the consolidated balance sheet. The Company’s investment securities are valued using quoted market prices or readily available market interest rate data. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners are valued using the quoted market price of Common Shares.

The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying Consolidated Balance Sheets at September 30, 2011 and December 31, 2010:

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	9/30/2011		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level  3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	10,581	$	—	$	10,581	$	—
Supplemental Executive Retirement Plan	Other Assets		66,444		66,444		—		—
Available-for-Sale Investment Securities	Other Assets		1,505		1,505		—		—
Total		$	78,530	$	67,949	$	10,581	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	166,169	$	—	$	166,169	$	—
Supplemental Executive Retirement Plan	Other Liabilities		66,444		66,444		—		—
Total		$	232,613	$	66,444	$	166,169	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	378,798	$	—	$	378,798	$	—

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	12/31/2010		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	12,521	$	—	$	12,521	$	—
Forward Starting Swaps	Other Assets		3,276		—		3,276		—
Supplemental Executive Retirement Plan	Other Assets		58,132		58,132		—		—
Available-for-Sale Investment Securities	Other Assets		1,194		1,194		—		—
Total		$	75,123	$	59,326	$	15,797	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	37,756	$	—	$	37,756	$	—
Development Cash Flow Hedges	Other Liabilities		1,322		—		1,322		—
Supplemental Executive Retirement Plan	Other Liabilities		58,132		58,132		—		—
Total		$	97,210	$	58,132	$	39,078	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	383,540	$	—	$	383,540	$	—

The following tables provide a summary of the effect of fair value hedges on the Company’s accompanying Consolidated Statements of Operations for the nine months ended September 30, 2011 and 2010, respectively (amounts in thousands):

September 30, 2011 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative			Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	(1,940	)		Fixed rate debt		Interest expense	$	1,940
Total			$	(1,940	)					$	1,940

September 30, 2010 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative		Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	9,842		Fixed rate debt		Interest expense	$	(9,842	)
Total			$	9,842					$	(9,842	)

The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying Consolidated Statements of Operations for the nine months ended September 30, 2011 and 2010, respectively (amounts in thousands):

	Effective Portion							Ineffective Portion
September 30, 2011 Type of Cash Flow Hedge	Amount of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(131,689	)	Interest expense	$	(2,842	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,322		Interest expense		—			N/A		—
Total	$	(130,367	)		$	(2,842	)			$	—

	Effective Portion							Ineffective Portion
September 30. 2010 Type of Cash Flow Hedge	Amount  of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(124,908	)	Interest expense	$	(2,379	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,436		Interest expense		—			N/A		—
Total	$	(123,472	)		$	(2,379	)			$	—

As of September 30, 2011 and December 31, 2010, there were approximately $185.9 million and $58.3 million in deferred losses, net, included in accumulated other comprehensive (loss), respectively, related to derivative instruments. Based on the estimated fair values of the net derivative instruments at September 30, 2011, the Company may recognize an estimated $4.4 million of accumulated other comprehensive (loss) as additional interest expense during the twelve months ending September 30, 2012.

The following table sets forth the maturity, amortized cost, gross unrealized gains and losses, book/fair value and interest and other income of the various investment securities held as of September 30, 2011 (amounts in thousands):

		Other Assets
Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	830	$	—	$	1,505	$	—
Total		$	675	$	830	$	—	$	1,505	$	—

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Summary of Significant Accounting Policies (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2008	Aug. 18, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Unsecured Notes, face amount	$ 650,000,000
Convertible Notes, Premiums paid	0
Convertible Notes, stated interest rate	6.95%
Summary of Significant Accounting Policies (Textuals) [Abstract]
Deferred Tax Asset	38,700,000
Partially Owned Consolidated Properties	21
Partially Owned Consolidated Units	3,916
Noncontrolling Interests - Partially Owned Properties	(1,714,000)					7,991,000
Company owned properties in limited-life partnerships	6
Noncontrolling Interest Settlement Value	32,900,000
Convertible Notes, outstanding	482,500,000				482,500,000
Reduction in Earnings	5,000,000	5,800,000	5,000,000
Amount of Conversion Option	44,300,000
Paid-In Capital Increase				44,300,000
Decrease in Balance of Notes				17,300,000
Decrease in Earnings Per Share	$ 0.02	$ 0.02	$ 0.02
Unamortized cash and conversion option discounts	0					5,000,000
Carrying amount of conversion option remaining in paid-in capital	44,300,000					44,300,000
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Unsecured Notes, face amount	650,000,000
Convertible Notes, Premiums paid	0
Convertible Notes, issuance date	August 2006
Convertible Notes, maturity date	Aug. 01, 2026
Convertible Notes, stated interest rate	3.85%	3.85%
Interest expense recognized in relation to nonconvertible debt	11,800,000	13,900,000
Effective interest rate for conversion option	5.80%
Adjustments for New Accounting Pronouncement [Member] | Restatement Adjustment [Member]
Retained Earnings Adjustments [Line Items]
Retained Earnings Decrease				$ 27,000,000

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Equity, Capital and other Interests (Tables)

9 Months Ended

Sep. 30, 2011

Class of Stock [Line Items]

Common shares and units rollforward

	2011
Common Shares
Common Shares outstanding at January 1,		290,197,242
Common Shares Issued:
Conversion of OP Units		324,649
Issuance of Common Shares		3,038,980
Exercise of share options		2,914,476
Employee Share Purchase Plan (ESPP)		98,766
Restricted share grants, net		148,708
Common Shares Other:
Conversion of restricted shares to LTIP Units		(101,988	)
Common Shares outstanding at September 30,		296,620,833
Units
Units outstanding at January 1,		13,612,037
LTIP Units, net		120,112
Conversion of restricted shares to LTIP Units		101,988
Conversion of OP Units to Common Shares		(324,649	)
Units outstanding at September 30,		13,509,488
Total Common Shares and Units outstanding at September 30,		310,130,321
Units Ownership Interest in Operating Partnership		4.4	%

Preferred shares schedule

			Annual		Amounts in thousands
	Redemption Date (1)		Dividend per Share (2)		September 30, 2011		December 31, 2010
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized:
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 1,000,000 shares issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preferred; liquidation value $250 per share; 600,000 shares issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preferred shares (Series K and N) may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.

(2) Dividends on all series of Preferred Shares are payable quarterly at various pay dates. The dividend listed for Series N is a Preferred Share rate and the equivalent Depositary Share annual dividend is $1.62 per share.

(3) The Series N Preferred Shares have a corresponding depositary share that consists of ten times the number of shares and one-tenth the liquidation value and dividend per share.

OPERATING PARTNERSHIP

Class of Stock [Line Items]

Redeemable noncontrolling interests rollforward

	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

Preferred shares schedule

	Redemption Date (1)		Annual Dividend per Unit (2)		Amounts in thousands
					September 30, 2011		December 31, 2010
Preference Units:
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 1,000,000 units issued and outstanding at September 30, 2011 and December 31, 2010		12/10/26	$	4.145	$	50,000	$	50,000
6.48% Series N Cumulative Redeemable Preference Units; liquidation value $250 per unit; 600,000 units issued and outstanding at September 30, 2011 and December 31, 2010 (3)		6/19/08	$	16.20		150,000		150,000
					$	200,000	$	200,000

(1) On or after the redemption date, redeemable preference units (Series K and N) may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares.

(2) Dividends on all series of Preference Units are payable quarterly at various pay dates. The dividend listed for Series N is a Preference Unit rate and the equivalent depositary unit annual dividend is $1.62 per unit.

(3) The Series N Preference Units have a corresponding depositary unit that consists of ten times the number of units and one-tenth the liquidation value and dividend per unit.

General And Limited Partner [Member]

Class of Stock [Line Items]

Common shares and units rollforward

	2011
General and Limited Partner Units
General and Limited Partner Units outstanding at January 1,		303,809,279
Issued to General Partner:
Issuance of OP Units		3,038,980
Exercise of EQR share options		2,914,476
EQR’s Employee Share Purchase Plan (ESPP)		98,766
EQR restricted share grants, net		148,708
Issued to Limited Partners:
LTIP Units, net		120,112
General and Limited Partner Units outstanding at September 30,		310,130,321
Limited Partner Units
Limited Partner Units outstanding at January 1,		13,612,037
Limited Partner LTIP Units, net		120,112
Conversion of EQR restricted shares to LTIP Units		101,988
Conversion of Limited Partner OP Units to EQR Common Shares		(324,649	)
Limited Partner Units outstanding at September 30,		13,509,488
Limited Partner Units Ownership Interest in Operating Partnership		4.4	%

LIMITED PARTNERS

Class of Stock [Line Items]

Redeemable noncontrolling interests rollforward

	2011
Balance at January 1,	$	383,540
Change in market value		(16,023	)
Change in carrying value		11,281
Balance at September 30,	$	378,798

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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
REVENUES
Rental income	$ 509,030	$ 451,832	$ 1,470,398	$ 1,311,377
Fee and asset management	2,928	2,128	6,682	7,596
Total revenues	511,958	453,960	1,477,080	1,318,973
EXPENSES
Property and maintenance	106,635	104,259	314,768	303,916
Real estate taxes and insurance	59,083	56,205	168,056	160,307
Property management	19,241	19,014	62,389	59,770
Fee and asset management	1,250	679	3,207	4,242
Depreciation	164,552	158,318	482,039	457,822
General and administrative	10,121	10,221	32,462	31,029
Total expenses	360,882	348,696	1,062,921	1,017,086
Operating income	151,076	105,264	414,159	301,887
Interest and other income	5,317	201	6,608	5,045
Other expenses	(2,528)	(3,487)	(9,318)	(9,513)
Interest:
Expense incurred, net	(113,370)	(121,116)	(354,960)	(348,279)
Amortization of deferred financing costs	(4,721)	(2,437)	(12,129)	(7,729)
Income (loss) before income and other taxes, (loss) income from investments in unconsolidated entities, net gain (loss) on sales of unconsolidated entities and land parcels and discontinued operations	35,774	(21,575)	44,360	(58,589)
Income and other tax (expense) benefit	(283)	(291)	(669)	(283)
(Loss) income from investments in unconsolidated entities		188		(735)
Net gain on sales of unconsolidated entities		22,544		28,101
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Income (loss) from continuing operations	35,491	(295)	47,908	(32,667)
Discontinued operations, net	77,486	30,121	779,888	130,438
Net income	112,977	29,826	827,796	97,771
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(4,742)	(1,231)	(36,275)	(4,167)
Partially Owned Properties	(387)	188	(418)	623
Net income attributable to controlling interests	107,848	28,783	791,103	94,227
Preferred distributions	(3,466)	(3,617)	(10,399)	(10,855)
Net income available to Common Shares	$ 104,382	$ 25,166	$ 780,704	$ 83,372
Earnings per share - basic:
Income (loss) from continuing operations available to Common Shares	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Net income available to Common Shares	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Weighted average Common Shares outstanding	295,831	282,717	294,474	281,867
Earnings per share - diluted:
Income (loss) from continuing operations available to Common Shares	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Net income available to Common Shares	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Weighted average Common Shares outstanding	312,844	282,717	311,908	281,867
Distributions declared per Common Share outstanding	$ 0.3375	$ 0.3375	$ 1.0125	$ 1.0125

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Earnings Per Share and Earnings Per Unit

9 Months Ended

Sep. 30, 2011

Earnings Per Share and Earnings Per Unit [Abstract]

Earnings Per Share and Earnings Per Unit

10. Earnings Per Share and Earnings Per Unit

Equity Residential

The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per share – basic:
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Allocation to Noncontrolling Interests – Operating Partnership, net		(1,648	)		2,042			(1,371	)		173
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Preferred distributions		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests		35,443			(40,857	)		30,267			(3,551	)
Discontinued operations, net of Noncontrolling Interests		745,261			124,229			74,115			28,717
Numerator for net income per share – basic	$	780,704		$	83,372		$	104,382		$	25,166
Numerator for net income per share – diluted (1):
Income from continuing operations	$	47,908					$	35,491
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties		(418	)					(387	)
Preferred distributions		(10,399	)					(3,466	)
Income from continuing operations available to Common Shares		37,091						31,638
Discontinued operations, net		779,888						77,486
Numerator for net income per share – diluted (1)	$	816,979		$	83,372		$	109,124		$	25,166
Denominator for net income per share – basic and diluted (1):
Denominator for net income per share – basic		294,474			281,867			295,831			282,717
Effect of dilutive securities:
OP Units		13,231						13,053
Long-term compensation shares/units		4,203						3,960
Denominator for net income per share – diluted (1)		311,908			281,867			312,844			282,717
Net income per share – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per share – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per share – basic:
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net of Noncontrolling Interests		2.531			0.441			0.251			0.102
Net income per share – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per share – diluted (1):
Income (loss) from continuing operations available to Common Shares	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per share – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

Convertible preferred shares/units that could be converted into 0 and 396,098 weighted average Common Shares for the nine months ended September 30, 2011 and 2010, respectively, and 0 and 393,724 weighted average Common Shares for the quarters ended September 30, 2011 and 2010, respectively, were outstanding but were not included in the computation of diluted earnings per share because the effects would be anti-dilutive. In addition, the effect of the Common Shares that could ultimately have been issued upon the conversion/exchange of the Company’s $650.0 million exchangeable senior notes ($482.5 million outstanding were redeemed on August 18, 2011) was not included in the computation of diluted earnings per share because the effects would be anti-dilutive.

ERP Operating Limited Partnership

The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Numerator for net income per Unit – basic and diluted (1):
Income (loss) from continuing operations	$	47,908		$	(32,667	)	$	35,491		$	(295	)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties		(418	)		623			(387	)		188
Allocation to Preference Units		(10,399	)		(10,855	)		(3,466	)		(3,617	)
Income (loss) from continuing operations available to Units		37,091			(42,899	)		31,638			(3,724	)
Discontinued operations, net		779,888			130,438			77,486			30,121
Numerator for net income per Unit – basic and diluted (1)	$	816,979		$	87,539		$	109,124		$	26,397
Denominator for net income per Unit – basic and diluted (1):
Denominator for net income per Unit – basic		307,705			295,572			308,884			296,348
Effect of dilutive securities:
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units		4,203						3,960
Denominator for net income per Unit – diluted (1)		311,908			295,572			312,844			296,348
Net income per Unit – basic	$	2.65		$	0.30		$	0.35		$	0.09
Net income per Unit – diluted	$	2.62		$	0.30		$	0.35		$	0.09
Net income per Unit – basic:
Income (loss) from continuing operations available to Units	$	0.120		$	(0.145	)	$	0.102		$	(0.013	)
Discontinued operations, net		2.531			0.441			0.251			0.102
Net income per Unit – basic	$	2.651		$	0.296		$	0.353		$	0.089
Net income per Unit – diluted (1):
Income (loss) from continuing operations available to Units	$	0.119		$	(0.145	)	$	0.101		$	(0.013	)
Discontinued operations, net		2.500			0.441			0.248			0.102
Net income per Unit – diluted	$	2.619		$	0.296		$	0.349		$	0.089

(1) Potential Units issuable from the assumed exercise/vesting of the Company’s long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the nine months and quarter ended September 30, 2010.

Convertible preference interests/units that could be converted into 0 and 396,098 weighted average Common Shares (which would be contributed to the Operating Partnership in exchange for OP Units) for the nine months ended September 30, 2011 and 2010, respectively, and 0 and 393,724 weighted average Common Shares (which would be contributed to the Operating Partnership in exchange for OP Units) for the quarters ended September 30, 2011 and 2010, respectively, were outstanding but were not included in the computation of diluted earnings per Unit because the effects would be anti-dilutive. In addition, the effect of the Common Shares/OP Units that could ultimately have been issued upon the conversion/exchange of the Company’s $650.0 million exchangeable senior notes ($482.5 million outstanding were redeemed on August 18, 2011) was not included in the computation of diluted earnings per Unit because the effects would be anti-dilutive.

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Commitments to Acquire/Dispose of Real Estate (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan
Commitments to Acquire Real Estate
Properties Acquired-Total	6
Rental Units Acquired - Total	2,641
Purchase Price - Total	$ 552,887
Commitments to Dispose of Real Estate
Rental Units Disposed-Total	351
Properties Disposed - Total	4
Sales Price-Total	15,550
Rental Properties [Member]
Commitments to Acquire Real Estate
Properties Acquired-Total	6
Rental Units Acquired - Total	2,641
Purchase Price - Total	394,900
Commitments to Dispose of Real Estate
Rental Units Disposed-Total	351
Properties Disposed - Total	4
Sales Price-Total	15,550
Land Parcels (three) [Member]
Commitments to Acquire Real Estate
Properties Acquired-Total	0
Rental Units Acquired - Total	0
Purchase Price - Total	$ 157,987

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2011

Commitments and Contingencies [Abstract]

Commitments and Contingencies

12. Commitments and Contingencies

The Company, as an owner of real estate, is subject to various Federal, state and local environmental laws. Compliance by the Company with existing laws has not had a material adverse effect on the Company. However, the Company cannot predict the impact of new or changed laws or regulations on its current properties or on properties that it may acquire in the future.

The Company is party to a housing discrimination lawsuit brought by a non-profit civil rights organization in April 2006 in the U.S. District Court for the District of Maryland. The suit alleges that the Company designed and built approximately 300 of its properties in violation of the accessibility requirements of the Fair Housing Act and Americans With Disabilities Act. The suit seeks actual and punitive damages, injunctive relief (including modification of non-compliant properties), costs and attorneys’ fees. The Company believes it has a number of viable defenses, including that a majority of the named properties were completed before the operative dates of the statutes in question and/or were not designed or built by the Company. Accordingly, the Company is defending the suit vigorously. Due to the pendency of the Company’s defenses and the uncertainty of many other critical factual and legal issues, it is not possible to determine or predict the outcome of the suit or a possible loss or a range of loss, and no amounts have been accrued at September 30, 2011. While no assurances can be given, the Company does not believe that the suit, if adversely determined, would have a material adverse effect on the Company.

The Company does not believe there is any other litigation pending or threatened against it that, individually or in the aggregate, may reasonably be expected to have a material adverse effect on the Company.

The Company had established a reserve and recorded a corresponding reduction to its net gain on sales of discontinued operations related to potential liabilities associated with its condominium conversion activities. The reserve covered potential product liability related to each conversion. The Company periodically assessed the adequacy of the reserve and made adjustments as necessary. During the nine months ended September 30, 2011, the Company recorded additional reserves of approximately $0.1 million, paid approximately $2.3 million in settlements and legal fees and released approximately $1.1 million of remaining reserves. No amounts remain accrued at September 30, 2011 as the Company does not believe it has material exposure remaining for its past condominium conversion activities.

As of September 30, 2011, the Company has four consolidated projects totaling 747 apartment units in various stages of development with commitments to fund of approximately $117.1 million and estimated completion dates ranging through September 30, 2013, as well as other completed development projects that are in various stages of lease up or are stabilized. The consolidated projects under development are being developed solely by the Company, while certain completed development projects were either developed solely by the Company or co-developed with various third party development partners. The development venture agreements with partners are primarily deal-specific, with differing terms regarding profit-sharing, equity contributions, returns on investment, buy-sell agreements and other customary provisions. The partner is most often the “general” or “managing” partner of the development venture. The typical buy-sell arrangements contain appraisal rights and provisions that provide the right, but not the obligation, for the Company to acquire the partner’s interest in the project at fair market value upon the expiration of a negotiated time period (typically two to five years after substantial completion of the project).

As of September 30, 2011, the Company has two unconsolidated projects totaling 945 apartment units under development with commitments to fund of approximately $6.6 million and estimated completion dates ranging through June 30, 2013. While the Company is the managing member of both of the joint ventures, is responsible for constructing both projects and has given certain construction cost overrun guarantees, all major decisions are made jointly, the large majority of funding is provided by the partner and the partner has significant involvement in and oversight of the ongoing projects. The buy-sell arrangements contain provisions that provide the right, but not the obligation, for the Company to acquire the partner’s interests or sell its interests at any time following the occurrence of certain pre-defined events (including at stabilization) described in the development venture agreements.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive income (loss):
Net income	$ 112,977	$ 29,826	$ 827,796	$ 97,771
Other comprehensive (loss) - derivative instruments:
Unrealized holding (losses) arising during the period	(105,248)	(37,726)	(130,367)	(123,472)
Accumulated other comprehensive income	951	914	2,842	2,379
Other comprehensive income (loss) - other instruments:
Unrealized holding gains (losses) arising during the period	(182)	14	311	(52)
Other comprehensive (loss)	(104,479)	(36,798)	(127,214)	(121,145)
Comprehensive income (loss)	8,498	(6,972)	700,582	(23,374)
Comprehensive (income) attributable to Noncontrolling Interests	(5,129)	(1,043)	(36,693)	(3,544)
Comprehensive income (loss) attributable to controlling interests	$ 3,369	$ (8,015)	$ 663,889	$ (26,918)

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Real Estate

9 Months Ended

Sep. 30, 2011

Real Estate [Abstract]

Real Estate

4. Real Estate

The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of September 30, 2011 and December 31, 2010 (amounts in thousands):

	September 30, 2011			December 31, 2010
Land	$	4,158,288		$	4,110,275
Depreciable property:
Buildings and improvements		13,822,345			13,995,121
Furniture, fixtures and equipment		1,233,225			1,231,391
Projects under development:
Land		26,772			28,260
Construction-in-progress		92,661			102,077
Land held for development:
Land		162,355			198,465
Construction-in-progress		43,121			36,782
Investment in real estate		19,538,767			19,702,371
Accumulated depreciation		(4,405,479	)		(4,337,357	)
Investment in real estate, net	$	15,133,288		$	15,365,014

During the nine months ended September 30, 2011, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):

	Properties		Apartment Units		Purchase Price
Rental Properties – Consolidated		10		2,529	$	701,748
Land Parcels (three) (1)		—		—		18,450
Other (2)		—		—		11,750
Total		10		2,529	$	731,948

(1) Includes entry into a long-term ground lease for a land parcel in New York City.

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

During the nine months ended September 30, 2011, the Company disposed of the following to unaffiliated parties (sales price in thousands):

	Properties		Apartment Units		Sales Price
Rental Properties – Consolidated		45		13,528	$	1,383,414
Land Parcel (one) (1)		—		—		22,786
Total		45		13,528	$	1,406,200

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

The Company recognized a net gain on sales of discontinued operations of approximately $759.1 million and a net gain on sales of land parcels of approximately $4.2 million on the above sales.

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Derivative and Other Fair Value Instruments (Details Textuals) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Derivative and Other Fair Value Instruments (Textuals) [Abstract]
Carrying value of the mortgage notes payable	$ 4,136,848,000	$ 4,762,896,000
Carrying value of unsecured debt	4,600,000
Fair value of the mortgage notes payable	4,400,000,000
Fair value of the unsecured debt payable	5,000,000,000
Forward starting swaps counterparty terminations designated for 2012 maturity	750,000,000
Forward starting swaps counterparty terminations designated for 2013 maturity	200,000,000
Deferred Loss In OCI	185,900,000	58,300,000
Estimated Future Losses In OCI	$ 4,400,000

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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse
Commitments and Contingencies (Textuals) [Abstract]
300 properties designed and built in violation of accessibility requirements	300
$0.1 million additional reserve	$ 0.1
$2.3 million of paid claims	2.3
$1.1 million released of reserves	1.1
Reserve balance	0
Four projects in various stages of development	4
Number of units in various stages of development	747
Various stages of development with estimated completion dates ranging through September 30, 2011	Sep. 30, 2013
Consolidated project under development commitment fund	117.1
Number of unconsolidated projects	2
Number of apartments in development under unconsolidated projects	945
Unconsolidated project under development commitment fund	$ 6.6
Estimated completion period of project	June 30,2013

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Derivative and Other Fair Value Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Derivative and Other Fair Value Instruments [Abstract]

Derivative Instrument Table

	Fair Value Hedges (1)			Forward Starting Swaps (2)
Current Notional Balance	$	315,693		$	950,000
Lowest Possible Notional	$	315,693		$	950,000
Highest Possible Notional	$	317,694		$	950,000
Lowest Interest Rate		2.009	%		3.478	%
Highest Interest Rate		4.800	%		4.695	%
Earliest Maturity Date		2012			2021
Latest Maturity Date		2013			2023

(1) Fair Value Hedges – Converts outstanding fixed rate debt to a floating interest rate.

(2) Forward Starting Swaps – Designed to partially fix the interest rate in advance of a planned future debt issuance. These swaps have mandatory counterparty terminations from 2012 through 2014, and $750.0 million and $200.0 million are targeted to 2012 and 2013 issuances, respectively.

Schedule of fair value financial instruments measured on recurring basis and their location in the statement of financial position

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	9/30/2011		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level  3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	10,581	$	—	$	10,581	$	—
Supplemental Executive Retirement Plan	Other Assets		66,444		66,444		—		—
Available-for-Sale Investment Securities	Other Assets		1,505		1,505		—		—
Total		$	78,530	$	67,949	$	10,581	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	166,169	$	—	$	166,169	$	—
Supplemental Executive Retirement Plan	Other Liabilities		66,444		66,444		—		—
Total		$	232,613	$	66,444	$	166,169	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	378,798	$	—	$	378,798	$	—

				Fair Value Measurements at Reporting Date Using
Description	Balance Sheet Location	12/31/2010		Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)		Significant  Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Fair Value Hedges	Other Assets	$	12,521	$	—	$	12,521	$	—
Forward Starting Swaps	Other Assets		3,276		—		3,276		—
Supplemental Executive Retirement Plan	Other Assets		58,132		58,132		—		—
Available-for-Sale Investment Securities	Other Assets		1,194		1,194		—		—
Total		$	75,123	$	59,326	$	15,797	$	—
Liabilities
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps	Other Liabilities	$	37,756	$	—	$	37,756	$	—
Development Cash Flow Hedges	Other Liabilities		1,322		—		1,322		—
Supplemental Executive Retirement Plan	Other Liabilities		58,132		58,132		—		—
Total		$	97,210	$	58,132	$	39,078	$	—
Redeemable Noncontrolling Interests –
Operating Partnership/Redeemable
Limited Partners	Mezzanine	$	383,540	$	—	$	383,540	$	—

Schedule of Location of Fair Value Hedges on Statement of Operations

September 30, 2011 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative			Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	(1,940	)		Fixed rate debt		Interest expense	$	1,940
Total			$	(1,940	)					$	1,940

September 30, 2010 Type of Fair Value Hedge	Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Recognized in Income on Derivative		Hedged Item		Income Statement Location of Hedged Item Gain/(Loss)		Amount of Gain/(Loss) Recognized in Income on Hedged Item
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Interest Rate Swaps		Interest expense	$	9,842		Fixed rate debt		Interest expense	$	(9,842	)
Total			$	9,842					$	(9,842	)

Schedule of Location of Cash flow Hedges on Statement of Operations

	Effective Portion							Ineffective Portion
September 30, 2011 Type of Cash Flow Hedge	Amount of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(131,689	)	Interest expense	$	(2,842	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,322		Interest expense		—			N/A		—
Total	$	(130,367	)		$	(2,842	)			$	—

	Effective Portion							Ineffective Portion
September 30. 2010 Type of Cash Flow Hedge	Amount  of Gain/(Loss) Recognized in OCI on Derivative			Location of Gain/(Loss) Reclassified from Accumulated OCI into Income	Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income			Location of Gain/(Loss) Recognized in Income on Derivative		Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income
Derivatives designated as hedging instruments:
Interest Rate Contracts:
Forward Starting Swaps/Treasury Locks	$	(124,908	)	Interest expense	$	(2,379	)		N/A	$	—
Development Interest Rate Swaps/Caps		1,436		Interest expense		—			N/A		—
Total	$	(123,472	)		$	(2,379	)			$	—

Schedule of Available for Sale and Held to Maturity Securities

		Other Assets
Security	Maturity	Amortized Cost		Unrealized Gains		Unrealized Losses		Book/ Fair Value		Interest and Other Income
Available-for-Sale Investment Securities	N/A	$	675	$	830	$	—	$	1,505	$	—
Total		$	675	$	830	$	—	$	1,505	$	—

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Debt

9 Months Ended

Sep. 30, 2011

Debt [Abstract]

Debt

8. Debt

EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. EQR guarantees the Operating Partnership’s $500.0 million unsecured senior term loan and also guarantees the Operating Partnership’s revolving credit facility up to the maximum amount and for the full term of the facility.

Mortgage Notes Payable

As of September 30, 2011, the Company had outstanding mortgage debt of approximately $4.1 billion.

During the nine months ended September 30, 2011, the Company:

• Repaid $871.5 million of mortgage loans;

• Obtained $152.9 million of new mortgage loan proceeds; and

• Assumed $99.1 million of mortgage debt on three acquired properties.

The Company recorded approximately $4.1 million of write-offs of unamortized deferred financing costs during the nine months ended September 30, 2011 as additional interest expense related to debt extinguishment of mortgages.

As of September 30, 2011, the Company had $411.2 million of secured debt subject to third party credit enhancement.

As of September 30, 2011, scheduled maturities for the Company’s outstanding mortgage indebtedness were at various dates through September 1, 2048. At September 30, 2011, the interest rate range on the Company’s mortgage debt was 0.14% to 11.25%. During the nine months ended September 30, 2011, the weighted average interest rate on the Company’s mortgage debt was 4.83%.

Notes

As of September 30, 2011, the Company had outstanding unsecured notes of approximately $4.6 billion.

During the nine months ended September 30, 2011, the Company:

• Repaid $93.1 million of 6.95% unsecured notes at maturity;

• Exercised the second of its two one-year extension options for its $500.0 million term loan facility and as a result, the maturity date is now October 5, 2012; and

• Redeemed $482.5 million of its 3.85% exchangeable unsecured notes with a final maturity of 2026 at par and no premium was paid.

As of September 30, 2011, scheduled maturities for the Company’s outstanding notes were at various dates through 2026. At September 30, 2011, the interest rate range on the Company’s notes was 0.74% to 7.57%. During the nine months ended September 30, 2011, the weighted average interest rate on the Company’s notes was 5.16%.

Lines of Credit

In July 2011, the Company replaced its then existing unsecured revolving credit facility with a new $1.25 billion unsecured revolving credit facility maturing on July 13, 2014, subject to a one-year extension option exercisable by the Company. The Company has the ability to increase available borrowings by an additional $500.0 million by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. The interest rate on advances under the new credit facility will generally be LIBOR plus a spread (currently 1.15%) and the Company pays an annual facility fee of 0.2%. Both the spread and the facility fee are dependent on the credit rating of the Company’s long-term debt. This facility replaced the Company’s existing $1.425 billion facility which was scheduled to mature in February 2012. The Company wrote-off $0.2 million in unamortized deferred financing costs related to the old facility.

As of September 30, 2011, the amount available on the credit facility was $1.14 billion (net of $85.9 million which was restricted/dedicated to support letters of credit and net of $26.0 million outstanding). During the nine months ended September 30, 2011, the weighted average interest rate was 1.32%.

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CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investment in real estate
Land	$ 4,158,288	$ 4,110,275
Depreciable property	15,055,570	15,226,512
Projects under development	119,433	130,337
Land held for development	205,476	235,247
Investment in real estate	19,538,767	19,702,371
Accumulated depreciation	(4,405,479)	(4,337,357)
Investment in real estate, net	15,133,288	15,365,014
Cash and cash equivalents	45,986	431,408
Investments in unconsolidated entities	11,020	3,167
Deposits - restricted	369,461	180,987
Escrow deposits - mortgage	10,677	12,593
Deferred financing costs, net	37,334	42,033
Other assets	149,051	148,992
Total assets	15,756,817	16,184,194
Liabilities:
Mortgage notes payable	4,136,848	4,762,896
Notes, net	4,614,323	5,185,180
Lines of credit	26,000	0
Accounts payable and accrued expenses	97,845	39,452
Accrued interest payable	69,895	98,631
Other liabilities	409,591	304,202
Security deposits	62,073	60,812
Distributions payable	106,673	140,905
Total liabilities	9,523,248	10,592,078
Commitments and contingencies
Redeemable Noncontrolling Interests - Operating Partnership	378,798	383,540
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,600,000 shares issued and outstanding as of September 30, 2011 and December 31, 2010	200,000	200,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 296,620,833 shares issued and outstanding as of September 30, 2011 and 290,197,242 shares issued and outstanding as of December 31, 2010	2,966	2,902
Paid in capital	5,032,863	4,741,521
Retained earnings	684,902	203,581
Accumulated other comprehensive (loss)	(185,032)	(57,818)
Total shareholders' equity	5,735,699	5,090,186
Noncontrolling Interests:
Operating Partnership	120,786	110,399
Partially Owned Properties	(1,714)	7,991
Total Noncontrolling Interests	119,072	118,390
Total equity	5,854,771	5,208,576
Total liabilities and equity	$ 15,756,817	$ 16,184,194

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Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2011

Discontinued Operations [Abstract]

Components of discontinued operations

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
REVENUES
Rental income	$	87,279		$	213,221		$	3,764		$	75,310
Total revenues		87,279			213,221			3,764			75,310
EXPENSES (1)
Property and maintenance		46,177			85,544			2,202			31,051
Real estate taxes and insurance		5,369			17,162			151			5,619
Depreciation		14,344			43,873			901			15,701
General and administrative		49			32			2			13
Total expenses		65,939			146,611			3,256			52,384
Discontinued operating income		21,340			66,610			508			22,926
Interest and other income		140			640			42			7
Interest (2):
Expense incurred, net		(83	)		(6,032	)		(21	)		(2,056	)
Amortization of deferred financing costs		(640	)		(252	)		—			(28	)
Income and other tax (expense) benefit		31			(66	)		93			(13	)
Discontinued operations		20,788			60,900			622			20,836
Net gain on sales of discontinued operations		759,100			69,538			76,864			9,285
Discontinued operations, net	$	779,888		$	130,438		$	77,486		$	30,121

(1) Includes expenses paid in the current period for properties sold or held for sale in prior periods related to the Company’s period of ownership.

(2) Includes only interest expense specific to secured mortgage notes payable for properties sold and/or held for sale.

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Debt (Details) (USD $)	9 Months Ended
	Sep. 30, 2011 Year Project Apartment Property Store Customers OptionPlan State MilitaryHouse	Dec. 31, 2010
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,136,848,000	$ 4,762,896,000
Interest rate range from minimum	0.74%
Interest rate range to maximum	7.57%
Average interest rate	1.32%
Unsecured debt, stated interest rate	6.95%
Maturity date description	October 5,2012
Unsecured revolving credit facility	1,250,000,000
Line of credit maturity	Feb. 28, 2012
Debt (Textuals) [Abstract]
Scheduled principal repayments	871,500,000
Write-off of unamortized deferred financing costs	4,100,000
Obtained new mortgage loans	152,900,000
Assumed mortgage debt	99,100,000
Properties acquired	3
Outstanding unsecured notes	4,600,000,000
Repayment of unsecured notes	93,100,000
Interest rate range from minimum	0.74%
Interest rate range to maximum	7.57%
Weighted average interest rate 5.16%	5.16%
Term loan facility amount	500,000,000
No of extension options	2
Period of extension options	1
Line of Credit Maturity	July 13, 2014
Advances under credit facility LIBOR plus spread	1.15%
Percentage of facility fee paid by the company	0.20%
Amount available on the credit facility	1,140,000,000
Amount restricted/dedicated to support letters of credit	85,900,000
Line of credit amount outstanding	26,000,000
Redeemed convertible unsecured notes	482,500,000
Redeemed convertible unsecured debt premium	0
500.0 million ability to increase	500,000,000
Unamortized deferred financing costs write-off	200,000
Various period of outstanding mortgage indebtedness	September 1,2048
Secured Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	411,200,000
Company range of interest rates on outstanding mortgage indebtedness at various dates through September 1, 2048 [Member]
Debt Instrument [Line Items]
Interest rate range from minimum	0.14%
Interest rate range to maximum	11.25%
Average interest rate	4.83%
Debt (Textuals) [Abstract]
Interest rate range from minimum	0.14%
Interest rate range to maximum	11.25%
3.85% Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured debt, stated interest rate	3.85%
Maturity date description	2026
Previous line of credit facility [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 1,425,000,000

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Earnings Per Share and Earnings Per Unit (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Aug. 18, 2011
Numerator for net income per Unit basic and diluted
Income (loss) from continuing operations	$ 35,491,000	$ (295,000)	$ 47,908,000	$ (32,667,000)
Partially Owned Properties	(387,000)	188,000	(418,000)	623,000
Discontinued operations, net	77,486,000	30,121,000	779,888,000	130,438,000
Earnings Per Share (Textuals) [Abstract]
Convertible preferred shares	0	393,724	0	396,098
Unsecured Notes, face amount	650,000,000		650,000,000
Convertible Notes, outstanding	482,500,000		482,500,000		482,500,000
OPERATING PARTNERSHIP
Numerator for net income per Unit basic and diluted
Income (loss) from continuing operations	35,491,000	(295,000)	47,908,000	(32,667,000)
Partially Owned Properties	(387,000)	188,000	(418,000)	623,000
Allocation to Preference Units	(3,466,000)	(3,617,000)	(10,399,000)	(10,855,000)
Income (loss) from continuing operations available to Units	31,638,000	(3,724,000)	37,091,000	(42,899,000)
Discontinued operations, net	77,486,000	30,121,000	779,888,000	130,438,000
Numerator for net income per Unit - basic and diluted	109,124,000	26,397,000	816,979,000	87,539,000
Denominator for net income per Unit - basic and diluted
Denominator for net income per Unit- basic	308,884,000	296,348,000	307,705,000	295,572,000
Effect of dilutive securities:
Dilution for Units issuable upon assumed exercise/vesting of the company's long-term compensation award shares/units	3,960,000		4,203,000
Denominator for net income per Unit - diluted	312,844,000	296,348,000	311,908,000	295,572,000
Net income per Unit - basic	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Net income per Unit - diluted	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Net income per Unit - basic:
Income from continuing operations available to Units	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Discontinued operations, net	$ 0.251	$ 0.102	$ 2.531	$ 0.441
Net income per Unit - basic	$ 0.35	$ 0.09	$ 2.65	$ 0.30
Net income per Unit - diluted
Income from continuing operations available to Units	$ 0.10	$ (0.01)	$ 0.12	$ (0.15)
Discontinued operations, net	$ 0.248	$ 0.102	$ 2.500	$ 0.441
Net income per Unit - diluted	$ 0.35	$ 0.09	$ 2.62	$ 0.30
Earnings Per Share (Textuals) [Abstract]
Convertible preferred shares	0	393,724	0	396,098
Unsecured Notes, face amount	650,000,000		650,000,000
Convertible Notes, outstanding	$ 482,500,000		$ 482,500,000

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Investments in Partially Owned Entities (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Co-invested in various properties with unrelated third parties [Member] Project Apartment	Sep. 30, 2011 Co-invested in various properties with unrelated third parties [Member] Consolidated Development Projects Held for and or Under Development [Member] Project Apartment	Sep. 30, 2011 Co-invested in various properties with unrelated third parties [Member] Consolidated Development Projects Completed and Stabilized [Member] Project Apartment	Sep. 30, 2011 Co-invested in various properties with unrelated third parties [Member] Consolidated Other [Member] Project Apartment
Partially Owned Property Balance Sheet Schedule
Total projects					21	0	2	19
Total apartment units					3,916	0	441	3,475
ASSETS
Investment in real estate	$ 19,538,767	$ 19,702,371			$ 587,580	$ 25,071	$ 114,570	$ 447,939
Accumulated depreciation	(4,405,479)	(4,337,357)			(151,630)	0	(11,186)	(140,444)
Investment in real estate, net	15,133,288	15,365,014			435,950	25,071	103,384	307,495
Cash and cash equivalents	45,986	431,408	43,660	193,288	14,299	1,643	1,578	11,078
Deposits - restricted	369,461	180,987			17,544	0	2,367	15,177
Escrow deposits - mortgage	10,677	12,593			50	0	50	0
Deferred financing costs, net	37,334	42,033			1,306	0	119	1,187
Other assets	149,051	148,992			357	89	132	136
Total assets	15,756,817	16,184,194			469,506	26,803	107,630	335,073
LIABILITIES AND EQUITY
Accounts payable and accrued expenses	97,845	39,452			4,466	179	1,327	2,960
Accrued interest payable	69,895	98,631			978	0	258	720
Other liabilities	409,591	304,202			4,183	1,274	47	2,862
Security deposits	62,073	60,812			1,592	0	110	1,482
Total liabilities	9,523,248	10,592,078			295,709	1,453	85,895	208,361
Noncontrolling Interests - Partially Owned Properties					(1,714)	2,243	1,079	(5,036)
Company equity/General and Limited Partners' capital					175,511	23,107	20,656	131,748
Total equity/capital					173,797	25,350	21,735	126,712
Total liabilities and equity	15,756,817	16,184,194			469,506	26,803	107,630	335,073
Debt-Secured:
Company/Operating Partnership Ownership					243,221		84,153	159,068
Noncontrolling Ownership					41,269			41,269
Carrying value of the mortgage notes payable	$ 4,136,848	$ 4,762,896			$ 284,490	$ 0	$ 84,153	$ 200,337

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Investments in Partially Owned Entities (Details 1) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Partially Owned Property Income Statement Schedule
Operating revenue	$ 511,958	$ 453,960	$ 1,477,080	$ 1,318,973
Net operating (loss) income		272,354
Depreciation	164,552	158,318	482,039	457,822
General and administrative/other	(10,121)	(10,221)	(32,462)	(31,029)
Operating (loss) income	151,076	105,264	414,159	301,887
Interest and other income	5,317	201	6,608	5,045
Other expenses	(2,528)	(3,487)	(9,318)	(9,513)
Interest:
Expense incurred, net	(113,370)	(121,116)	(354,960)	(348,279)
Amortization of deferred financing costs	(4,721)	(2,437)	(12,129)	(7,729)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations	35,774	(21,575)	44,360	(58,589)
Income and other tax (expense) benefit	(283)	(291)	(669)	(283)
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Net gain on sales of discontinued operations	(76,864)	(9,285)	759,100	69,538
Net income	112,977	29,826	827,796	97,771
Co-invested in various properties with unrelated third parties [Member] | Consolidated Development Projects Held for and or Under Development [Member]
Partially Owned Property Income Statement Schedule
Operating expenses			207
Net operating (loss) income			(207)
General and administrative/other			115
Operating (loss) income			(322)
Interest and other income			5
Other expenses			(289)
Interest:
Expense incurred, net			(399)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			(1,005)
Income and other tax (expense) benefit			(57)
Net gain (loss) on sales of land parcels			4,217
Net gain on sales of discontinued operations			169
Net income			3,324
Co-invested in various properties with unrelated third parties [Member] | Consolidated Development Projects Completed and Stabilized [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			6,649
Operating expenses			3,083
Net operating (loss) income			3,566
Depreciation			(3,121)
General and administrative/other			6
Operating (loss) income			439
Interest and other income			5
Interest:
Expense incurred, net			(2,465)
Amortization of deferred financing costs			(202)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			(2,223)
Net income			(2,223)
Co-invested in various properties with unrelated third parties [Member] | Consolidated Other [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			43,016
Operating expenses			14,487
Net operating (loss) income			28,529
Depreciation			(11,256)
General and administrative/other			50
Operating (loss) income			17,223
Interest and other income			10
Other expenses			(39)
Interest:
Expense incurred, net			(8,948)
Amortization of deferred financing costs			(341)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			7,905
Income and other tax (expense) benefit			(6)
Net gain on sales of discontinued operations			13,265
Net income			21,164
Co-invested in various properties with unrelated third parties [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			49,665
Operating expenses			17,777
Net operating (loss) income			31,888
Depreciation			(14,377)
General and administrative/other			171
Operating (loss) income			17,340
Interest and other income			20
Other expenses			(328)
Interest:
Expense incurred, net			(11,812)
Amortization of deferred financing costs			(543)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			4,677
Income and other tax (expense) benefit			(63)
Net gain (loss) on sales of land parcels			4,217
Net gain on sales of discontinued operations			13,434
Net income			$ 22,265

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Derivative and Other Fair Value Instruments (Details 4) (USD $) In Thousands	Sep. 30, 2011
Available for Sale
Other assets, amortized cost	$ 675
Other assets, Book/Fair value	1,505
Other assets, Unrealized Gains	830
Other assets, Unrealized Losses	0
Other assets, Interests and other income	$ 0

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Reportable Segments (Tables)

9 Months Ended

Sep. 30, 2011

Reportable Segments [Abstract]

Reportable Segments Schedule

	Nine Months Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	440,444	$	255,986	$	266,938	$	320,840	$	—		$	1,284,208
Non-same store/other (2) (3)		113,008		28,544		11,283		30,069		3,286			186,190
Total rental income		553,452		284,530		278,221		350,909		3,286			1,470,398
Operating expenses:
Same store (1)		160,900		91,053		106,223		109,768		—			467,944
Non-same store/other (2) (3)		43,631		10,911		4,162		12,257		6,308			77,269
Total operating expenses		204,531		101,964		110,385		122,025		6,308			545,213
NOI:
Same store (1)		279,544		164,933		160,715		211,072		—			816,264
Non-same store/other (2) (3)		69,377		17,633		7,121		17,812		(3,022	)		108,921
Total NOI	$	348,921	$	182,566	$	167,836	$	228,884	$	(3,022	)	$	925,185
Total assets	$	6,313,643	$	2,656,529	$	2,514,066	$	3,230,549	$	1,042,030		$	15,756,817

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.3 million and other corporate operations.

	Nine Months Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	417,347	$	240,767	$	256,307	$	310,950	$	—		$	1,225,371
Non-same store/other (2) (3)		64,743		10,698		6,429		7,629		(3,493	)		86,006
Total rental income		482,090		251,465		262,736		318,579		(3,493	)		1,311,377
Operating expenses:
Same store (1)		158,351		91,045		106,245		113,510		—			469,151
Non-same store/other (2) (3)		34,241		4,531		2,728		3,490		9,852			54,842
Total operating expenses		192,592		95,576		108,973		117,000		9,852			523,993
NOI:
Same store (1)		258,996		149,722		150,062		197,440		—			756,220
Non-same store/other (2) (3)		30,502		6,167		3,701		4,139		(13,345	)		31,164
Total NOI	$	289,498	$	155,889	$	153,763	$	201,579	$	(13,345	)	$	787,384

(1) Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 102,129 apartment units.

(2) Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.4 million and other corporate operations.

	Quarter Ended September 30, 2011
	Northeast		Northwest		Southeast		Southwest		Other (3)		Total
Rental income:
Same store (1)	$	163,887	$	91,663	$	90,979	$	110,779	$	—	$	457,308
Non-same store/other (2) (3)		27,889		6,657		3,773		10,862		2,541		51,722
Total rental income		191,776		98,320		94,752		121,641		2,541		509,030
Operating expenses:
Same store (1)		59,736		32,455		35,861		38,160		—		166,212
Non-same store/other (2) (3)		9,163		2,645		1,250		4,351		1,338		18,747
Total operating expenses		68,899		35,100		37,111		42,511		1,338		184,959
NOI:
Same store (1)		104,151		59,208		55,118		72,619		—		291,096
Non-same store/other (2) (3)		18,726		4,012		2,523		6,511		1,203		32,975
Total NOI	$	122,877	$	63,220	$	57,641	$	79,130	$	1,203	$	324,071

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

	Quarter Ended September 30, 2010
	Northeast		Northwest		Southeast		Southwest		Other (3)			Total
Rental income:
Same store (1)	$	155,119	$	84,969	$	86,963	$	106,457	$	—		$	433,508
Non-same store/other (2) (3)		12,963		2,158		2,002		2,537		(1,336	)		18,324
Total rental income		168,082		87,127		88,965		108,994		(1,336	)		451,832
Operating expenses:
Same store (1)		58,184		32,805		36,219		39,173		—			166,381
Non-same store/other (2) (3)		10,321		855		565		1,114		242			13,097
Total operating expenses		68,505		33,660		36,784		40,287		242			179,478
NOI:
Same store (1)		96,935		52,164		50,744		67,284		—			267,127
Non-same store/other (2) (3)		2,642		1,303		1,437		1,423		(1,578	)		5,227
Total NOI	$	99,577	$	53,467	$	52,181	$	68,707	$	(1,578	)	$	272,354

(1) Same store primarily includes all properties acquired or completed and stabilized prior to July 1, 2010, less properties subsequently sold, which represented 104,922 apartment units.

(2) Non-same store primarily includes properties acquired after July 1, 2010, plus any properties in lease-up and not stabilized as of July 1, 2010.

(3) Other includes development, condominium conversion overhead of $0.1 million and other corporate operations.

Note: Markets included in the above geographic segments are as follows:

(a) Northeast – New England (excluding Boston), Boston, New York Metro, DC Northern Virginia and Suburban Maryland.

(b) Northwest – Denver, Portland, San Francisco Bay Area and Seattle/Tacoma.

(c) Southeast – Atlanta, Jacksonville, Orlando and South Florida.

(d) Southwest – Inland Empire, Los Angeles, Orange County, Phoenix and San Diego.

Reconciliation of NOI

	Nine Months Ended September 30,						Quarter Ended September 30,
	2011			2010			2011			2010
Rental income	$	1,470,398		$	1,311,377		$	509,030		$	451,832
Property and maintenance expense		(314,768	)		(303,916	)		(106,635	)		(104,259	)
Real estate taxes and insurance expense		(168,056	)		(160,307	)		(59,083	)		(56,205	)
Property management expense		(62,389	)		(59,770	)		(19,241	)		(19,014	)
Total operating expenses		(545,213	)		(523,993	)		(184,959	)		(179,478	)
Net operating income	$	925,185		$	787,384		$	324,071		$	272,354