CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Real estate properties:
Land	$ 705,222us-gaap_Land	$ 714,238us-gaap_Land
Buildings and improvements	4,994,374	5,014,205
Total real estate properties, at cost, gross	5,699,596	5,728,443
Accumulated depreciation	(1,066,369)	(1,030,445)
Total real estate properties, at cost, net	4,633,227us-gaap_RealEstateInvestmentPropertyNet	4,697,998us-gaap_RealEstateInvestmentPropertyNet
Acquired real estate leases, net	184,894us-gaap_FiniteLivedIntangibleAssetsNet	198,287us-gaap_FiniteLivedIntangibleAssetsNet
Cash and cash equivalents	421,736	364,516
Restricted cash	33,349	32,257
Rents receivable, net of allowance for doubtful accounts of $8,110 and $6,565, respectively	249,408us-gaap_AccountsReceivableNet	248,101us-gaap_AccountsReceivableNet
Other assets, net	211,682us-gaap_OtherAssets	220,480us-gaap_OtherAssets
Total assets	5,734,296us-gaap_Assets	5,761,639us-gaap_Assets
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	1,598,652us-gaap_SeniorNotes	1,598,416us-gaap_SeniorNotes
Mortgage notes payable, net	606,423us-gaap_SecuredDebt	609,249us-gaap_SecuredDebt
Accounts payable and accrued expenses	149,009	162,204
Assumed real estate lease obligations, net	24,220us-gaap_OffMarketLeaseUnfavorable	26,784us-gaap_OffMarketLeaseUnfavorable
Rent collected in advance	30,719us-gaap_DeferredRevenue	31,359us-gaap_DeferredRevenue
Security deposits	14,095us-gaap_SecurityDepositLiability	14,044us-gaap_SecurityDepositLiability
Total liabilities	2,423,118us-gaap_Liabilities	2,442,056us-gaap_Liabilities
Common shares of beneficial interest, $0.01 par value:
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 129,733,742 and 129,607,279 shares issued and outstanding, respectively	1,297us-gaap_CommonStockValue	1,296us-gaap_CommonStockValue
Additional paid in capital	4,491,093	4,487,133
Cumulative net income	2,247,482	2,233,852
Cumulative other comprehensive loss	(72,228)	(53,216)
Cumulative common distributions	(3,111,868)eqc_CumulativeCommonStockDistributions	(3,111,868)eqc_CumulativeCommonStockDistributions
Cumulative preferred distributions	(629,252)	(622,271)
Total shareholders’ equity	3,311,178	3,319,583
Total liabilities and shareholders’ equity	5,734,296	5,761,639
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; 4,915,196 and 4,915,497 shares issued and outstanding, respectively, aggregate liquidation preference of $122,880 and $122,887, respectively	119,263	119,266
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

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.