CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Real estate properties:
Land	$ 714,238us-gaap_Land	$ 699,135us-gaap_Land
Buildings and improvements	5,014,205	4,838,030
Total real estate properties, at cost, gross	5,728,443	5,537,165
Accumulated depreciation	(1,030,445)	(895,059)
Total real estate properties, at cost, net	4,697,998us-gaap_RealEstateInvestmentPropertyNet	4,642,106us-gaap_RealEstateInvestmentPropertyNet
Properties held for sale	0us-gaap_InventoryRealEstateHeldForSale	573,531us-gaap_InventoryRealEstateHeldForSale
Acquired real estate leases, net	198,287	255,812
Equity investments	0us-gaap_EquityMethodInvestments	517,991us-gaap_EquityMethodInvestments
Cash and cash equivalents	379,058	222,449
Restricted cash	17,715	22,101
Rents receivable, net of allowance for doubtful accounts of $6,565 and $7,885, respectively	248,101us-gaap_AccountsReceivableNet	223,769us-gaap_AccountsReceivableNet
Other assets, net	220,480us-gaap_OtherAssets	188,675us-gaap_OtherAssets
Total assets	5,761,639us-gaap_Assets	6,646,434us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
Revolving credit facility	0us-gaap_LineOfCredit	235,000us-gaap_LineOfCredit
Senior unsecured debt, net	1,598,416us-gaap_UnsecuredDebt	1,855,900us-gaap_UnsecuredDebt
Mortgage notes payable, net	609,249us-gaap_SecuredDebt	914,510us-gaap_SecuredDebt
Liabilities related to properties held for sale	0us-gaap_LiabilitiesOfAssetsHeldForSale	28,734us-gaap_LiabilitiesOfAssetsHeldForSale
Accounts payable and accrued expenses	162,204us-gaap_OtherLiabilities	165,855us-gaap_OtherLiabilities
Assumed real estate lease obligations, net	26,784us-gaap_OffMarketLeaseUnfavorable	33,935us-gaap_OffMarketLeaseUnfavorable
Rent collected in advance	31,359us-gaap_DeferredRevenue	27,553us-gaap_DeferredRevenue
Security deposits	14,044us-gaap_SecurityDepositLiability	11,976us-gaap_SecurityDepositLiability
Due to related persons	0	9,385
Total liabilities	2,442,056us-gaap_Liabilities	3,282,848us-gaap_Liabilities
Commitments and contingencies
Preferred shares of beneficial interest, $0.01 par value; 50,000,000 shares authorized:
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 129,607,279 and 118,386,918 shares issued and outstanding, respectively (including 710,182 and 130,914 unvested restricted shares)	1,296us-gaap_CommonStockValue	1,184us-gaap_CommonStockValue
Additional paid in capital	4,487,133	4,213,474
Cumulative net income	2,233,852	2,209,840
Cumulative other comprehensive loss	(53,216)	(38,331)
Cumulative common distributions	(3,111,868)eqc_CumulativeCommonStockDistributions	(3,082,271)eqc_CumulativeCommonStockDistributions
Cumulative preferred distributions	(622,271)	(573,971)
Total shareholders' equity	3,319,583	3,363,586
Total liabilities and shareholders' equity	5,761,639	6,646,434
Series D
Preferred shares of beneficial interest, $0.01 par value; 50,000,000 shares authorized:
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,497 and 15,180,000 shares issued and outstanding, respectively, aggregate liquidation preference of $122,887 and $379,500, respectively	119,266	368,270
Total shareholders' equity	119,266	368,270
Series E
Preferred shares of beneficial interest, $0.01 par value; 50,000,000 shares authorized:
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 11,000,000 shares issued and outstanding, aggregate liquidation preference $275,000	265,391	265,391
Total shareholders' equity	$ 265,391	$ 265,391

Dollar value of issued convertible preferred stock, whether issued at par value, no par or stated value, that may be exchanged into common shares or other types of securities at the owner's option as long as it is in accordance with the issuer's terms. Convertible preferred stock possess conversion and redemption features. The stock has redemption features that are outside the control of the issuer.

No definition available.