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Equity, Capital and Other Interests (Tables) | 9 Months Ended
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Sep. 30, 2014
Common shares and units rollforward | 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, 2014:
|  | 2014
Common Shares |  |
Common Shares outstanding at January 1, |  | 360,479,260 |
Common Shares Issued: |  |
Conversion of OP Units |  | 68,296 |
Exercise of share options |  | 1,476,512 |
Employee Share Purchase Plan (ESPP) |  | 56,945 |
Restricted share grants, net |  | 170,460 |
Common Shares Other: |  |
Conversion of restricted shares to LTIP Units |  | (12,146 | )
Repurchased and retired |  | (31,240 | )
Common Shares outstanding at September 30, |  | 362,208,087 |
Units |  |
Units outstanding at January 1, |  | 14,180,376 |
LTIP Units, net |  | 200,840 |
Conversion of restricted shares to LTIP Units |  | 12,146 |
Conversion of OP Units to Common Shares |  | (68,296 | )
Units outstanding at September 30, |  | 14,325,066 |
Total Common Shares and Units outstanding at September 30, |  | 376,533,153 |
Units Ownership Interest in Operating Partnership |  | 3.8 | %
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Company’s issued and outstanding Preferred Shares as of September 30, 2014 and December 31, 2013:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Share (2) |  | September 30, 2014 |  | December 31, 2013
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, 2014 and December 31, 2013 |  | 12/10/26 |  |  | $4.145 |  |  | $ | 50,000 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 50,000 |  |  | $ | 50,000 |
(1) | On or after the redemption date, redeemable preferred shares 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 Preferred Shares are payable quarterly.
Redeemable Noncontrolling Interest [Table Text Block] | The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the nine months ended September 30, 2014 (amounts in thousands):
|  | 2014
Balance at January 1, |  | $ | 363,144 |
Change in market value |  | 69,579 |
Change in carrying value |  | (2,574 | )
Balance at September 30, |  | $ | 430,149 |
Limited Partner [Member] |
Common shares and units rollforward | 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, 2014:
|  | 2014
General and Limited Partner Units |  |
General and Limited Partner Units outstanding at January 1, |  | 374,659,636 |
Issued to General Partner: |  |
Exercise of EQR share options |  | 1,476,512 |
EQR’s Employee Share Purchase Plan (ESPP) |  | 56,945 |
EQR's restricted share grants, net |  | 170,460 |
Issued to Limited Partners: |  |
LTIP Units, net |  | 200,840 |
OP Units Other: |  |
Repurchased and retired |  | (31,240 | )
General and Limited Partner Units outstanding at September 30, |  | 376,533,153 |
Limited Partner Units |  |
Limited Partner Units outstanding at January 1, |  | 14,180,376 |
Limited Partner LTIP Units, net |  | 200,840 |
Conversion of EQR restricted shares to LTIP Units |  | 12,146 |
Conversion of Limited Partner OP Units to EQR Common Shares |  | (68,296 | )
Limited Partner Units outstanding at September 30, |  | 14,325,066 |
Limited Partner Units Ownership Interest in Operating Partnership |  | 3.8 | %
Schedule Of Preferred Stock [Table Text Block] | The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of September 30, 2014 and December 31, 2013:
|  |  |  |  |  | Amounts in thousands
|  | Redemption Date (1) |  | Annual Dividend per Unit (2) |  | September 30, 2014 |  | December 31, 2013
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, 2014 and December 31, 2013 |  | 12/10/26 |  |  | $4.145 |  |  | $ | 50,000 |  |  | $ | 50,000 |
|  |  |  |  |  | $ | 50,000 |  |  | $ | 50,000 |
(1) | On or after the redemption date, redeemable preference units 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 Preference Units are payable quarterly.
Redeemable Noncontrolling Interest [Table Text Block] | The following table presents the changes in the redemption value of the Redeemable Limited Partners for the nine months ended September 30, 2014 (amounts in thousands):
|  | 2014
Balance at January 1, |  | $ | 363,144 |
Change in market value |  | 69,579 |
Change in carrying value |  | (2,574 | )
Balance at September 30, |  | $ | 430,149 |

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