Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Real estate, at cost	$ 17,680,555	$ 17,158,210
Construction in progress	1,309,781	1,523,179
Land held for future development	273,587	297,376
Less: accumulated depreciation	(3,368,974)	(3,161,571)
Total real estate	15,894,949	15,817,194
Cash and cash equivalents	1,036,576	2,365,137
Cash held in escrows	59,248	57,201
Investments in securities	18,927	16,641
Tenant and other receivables (net of allowance for doubtful accounts of $1,496 and $1,636, respectively)	51,348	59,464
Accrued rental income (net of allowance of $6,756 and $3,636, respectively)	673,587	651,603
Deferred charges, net	853,924	884,450
Prepaid expenses and other assets	133,035	184,477
Investments in unconsolidated joint ventures	176,939	126,084
Total assets	18,898,533	20,162,251
Liabilities:
Mortgage notes payable	4,411,453	4,449,734
Unsecured senior notes (net of discount of $13,271 and $14,146 respectively)	5,836,729	5,835,854
Unsecured exchangeable senior notes (net of discount of $0 and $182, respectively)	0	744,880
Unsecured line of credit	0	0
Mezzanine notes payable	310,427	311,040
Outside member's notes payable	180,000	180,000
Accounts payable and accrued expenses	216,080	202,470
Dividends and distributions payable	112,420	497,242
Accrued interest payable	156,024	167,523
Other liabilities	539,716	578,969
Total liabilities	11,762,849	12,967,712
Commitments and contingencies	0	0
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership	18,006	51,312
Redeemable interest in property partnerships	103,778	99,609
Equity:
Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding	0	0
Preferred stock, $.01 par value, 50,000,000 shares authorized
5.25% Series B cumulative redeemable preferred stock, $.01 par value, liquidation preference of $2,500 per share, 92,000 shares authorized, 80,000 shares issued and outstanding at June 30, 2014 and December 31,2013	200,000	200,000
Common stock, $.01 par value, 250,000,000 shares authorized, 153,171,474 and 153,062,001 issued and 153,092,574 and 152,983,101 outstanding at June 30, 2014 and December 31, 2013, respectively	1,531	1,530
Additional paid-in capital	5,679,578	5,662,453
Dividends in excess of earnings	(176,929)	(108,552)
Treasury common stock at cost, 78,900 shares at June 30, 2014 and December 31, 2013	(2,722)	(2,722)
Accumulated other comprehensive loss	(10,429)	(11,556)
Total stockholders' equity attributable to Boston Properties, Inc.	5,691,029	5,741,153
Noncontrolling interests:
Common units of the Operating Partnership	601,775	576,333
Property partnerships	721,096	726,132
Total equity	7,013,900	7,043,618
Total liabilities and equity	$ 18,898,533	$ 20,162,251