Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Real estate, at cost	$ 11,786,353	$ 10,933,977
Construction in process	982,318	1,073,402
Land held for future development	284,115	757,556
Less: accumulated depreciation	(2,468,165)	(2,323,818)
Total real estate	10,584,621	10,441,117
Cash and cash equivalents	780,584	478,948
Cash held in escrows	302,439	308,031
Investments in securities	9,975	8,732
Tenant and other receivables (net of allowance for doubtful accounts of $1,798 and $2,081, respectively)	44,470	60,813
Related party notes receivable	276,375	270,000
Interest receivable from related party note receivable	79,884	69,005
Accrued rental income (net of allowance of $2,252 and $3,116, respectively)	491,878	442,683
Deferred charges, net	449,014	436,019
Prepaid expenses and other assets	92,470	65,663
Investments in unconsolidated joint ventures	772,502	767,252
Total assets	13,884,212	13,348,263
Liabilities:
Mortgage notes payable	3,181,469	3,047,586
Unsecured senior notes (net of discount of $8,163 and $8,402, respectively)	3,016,837	3,016,598
Unsecured exchangeable senior notes (net of discount of $5,892 and $8,249, respectively)	1,743,337	1,721,817
Unsecured line of credit
Accounts payable and accrued expenses	173,257	186,059
Dividends and distributions payable	83,369	81,031
Accrued interest payable	62,046	62,327
Other liabilities	231,702	213,000
Total liabilities	8,492,017	8,328,418
Commitments and contingencies
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership	55,652	55,652
Equity:
Preferred stock, $.01 par value, 50,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value, 250,000,000 shares authorized, 146,465,921 and 140,278,005 issued and 146,387,021 and 140,199,105 outstanding at June 30, 2011	1,464	1,402
Additional paid-in capital	4,846,003	4,417,162
Dividends in excess of earnings	(69,537)	(24,763)
Treasury common stock at cost, 78,900 shares at June 30, 2011 and December 31, 2010	(2,722)	(2,722)
Accumulated other comprehensive loss	(17,294)	(18,436)
Total stockholders' equity attributable to Boston Properties, Inc.	4,757,914	4,372,643
Noncontrolling interests:
Common units of the Operating Partnership	579,211	592,164
Balance of equity ventures that are not owned by the company	(582)	(614)
Total equity	5,336,543	4,964,193
Total liabilities and equity	$ 13,884,212	$ 13,348,263