Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Real estate, at cost (amounts includes variable interest entities (“VIEs”) at March 31, 2016)	$ 18,424,542	$ 18,465,405
Construction in progress (amounts related to VIEs of $486,025 at March 31, 2016)	857,578	763,935
Land held for future development	256,952	252,195
Less: accumulated depreciation (includes amounts related to VIEs at March 31, 2016)	(3,969,648)	(3,925,894)
Total real estate	15,569,424	15,555,641
Cash and cash equivalents (amounts related to VIEs of $227,255 at March 31, 2016)	1,605,678	723,718
Cash held in escrows (amounts related to VIEs of $3,671 at March 31, 2016)	71,349	73,790
Investments in securities	21,077	20,380
Tenant and other receivables (amounts related to VIEs of $24,403 at March 31, 2016)	73,759	97,865
Accrued rental income (amounts related to VIEs of $217,148 at March 31, 2016)	767,864	754,883
Deferred charges, net (amounts related to VIEs of $323,493 at March 31, 2016)	693,976	704,867
Prepaid expenses and other assets (amounts related to VIEs of $77,995 at March 31, 2016)	136,799	185,118
Investments in unconsolidated joint ventures	235,904	235,224
Total assets	19,175,830	18,351,486
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,060,838 at March 31, 2016)	3,416,622	3,435,242
Unsecured senior notes, net	6,255,602	5,264,819
Unsecured line of credit	0	0
Mezzanine notes payable (amounts related to VIEs of $308,142 at March 31, 2016)	308,142	308,482
Outside members' notes payable (amounts related to VIEs of $180,000 at March 31, 2016)	180,000	180,000
Accounts payable and accrued expenses (amounts related to VIEs of $82,270 at March 31, 2016)	252,727	274,709
Dividends and distributions payable	113,079	327,320
Accrued interest payable (amounts related to VIEs of $136,165 at March 31, 2016)	221,578	190,386
Other liabilities (amounts related to VIEs of $205,007 at March 31, 2016)	498,290	483,601
Total liabilities	11,246,040	10,464,559
Commitments and contingencies	0	0
Equity / Capital
Excess stock, $0.01 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 / unit liquidation preference $2,500 per share / unit, 92,000 shares / units authorized, 80,000 shares / units issued and outstanding at March 31, 2016 and December 31, 2015	200,000	200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 153,683,866 and 153,658,866 issued and 153,604,966 and 153,579,966 outstanding at March 31, 2016 and December 31, 2015, respectively	1,536	1,536
Additional paid-in capital	6,306,723	6,305,687
Dividends in excess of earnings	(699,048)	(780,952)
Treasury common stock at cost, 78,900 shares at March 31, 2016 and December 31, 2015	(2,722)	(2,722)
Accumulated other comprehensive loss	(56,706)	(14,114)
Total stockholders’ equity attributable to Boston Properties, Inc.	5,749,783	5,709,435
Noncontrolling interests:
Common units of the Operating Partnership	616,095	603,092
Property partnerships	1,563,912	1,574,400
Total equity	7,929,790	7,886,927
Total liabilities and equity / capital	19,175,830	18,351,486
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts includes variable interest entities (“VIEs”) at March 31, 2016)	18,006,818	18,045,011
Construction in progress (amounts related to VIEs of $486,025 at March 31, 2016)	857,578	763,935
Land held for future development	256,952	252,195
Less: accumulated depreciation (includes amounts related to VIEs at March 31, 2016)	(3,889,084)	(3,846,816)
Total real estate	15,232,264	15,214,325
Cash and cash equivalents (amounts related to VIEs of $227,255 at March 31, 2016)	1,605,678	723,718
Cash held in escrows (amounts related to VIEs of $3,671 at March 31, 2016)	71,349	73,790
Investments in securities	21,077	20,380
Tenant and other receivables (amounts related to VIEs of $24,403 at March 31, 2016)	73,759	97,865
Accrued rental income (amounts related to VIEs of $217,148 at March 31, 2016)	767,864	754,883
Deferred charges, net (amounts related to VIEs of $323,493 at March 31, 2016)	693,976	704,867
Prepaid expenses and other assets (amounts related to VIEs of $77,995 at March 31, 2016)	136,799	185,118
Investments in unconsolidated joint ventures	235,904	235,224
Total assets	18,838,670	18,010,170
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,060,838 at March 31, 2016)	3,416,622	3,435,242
Unsecured senior notes, net	6,255,602	5,264,819
Unsecured line of credit	0	0
Mezzanine notes payable (amounts related to VIEs of $308,142 at March 31, 2016)	308,142	308,482
Outside members' notes payable (amounts related to VIEs of $180,000 at March 31, 2016)	180,000	180,000
Accounts payable and accrued expenses (amounts related to VIEs of $82,270 at March 31, 2016)	252,727	274,709
Dividends and distributions payable	113,079	327,320
Accrued interest payable (amounts related to VIEs of $136,165 at March 31, 2016)	221,578	190,386
Other liabilities (amounts related to VIEs of $205,007 at March 31, 2016)	498,290	483,601
Total liabilities	11,246,040	10,464,559
Commitments and contingencies	0	0
Noncontrolling interest:
Redeemable partnership units—16,092,449 and 16,097,473 common units and 2,065,185 and 1,831,714 long term incentive units outstanding at redemption value at March 31, 2016 and December 31, 2015, respectively	2,307,472	2,286,689
Redeemable interest in property partnership	1,563,912	1,574,400
Preferred stock, $.01 par value, 50,000,000 shares authorized
5.25% Series B cumulative redeemable preferred stock / unit liquidation preference $2,500 per share / unit, 92,000 shares / units authorized, 80,000 shares / units issued and outstanding at March 31, 2016 and December 31, 2015	193,623	193,623
Accumulated other comprehensive loss	(65,830)	(18,337)
Noncontrolling interests:
Boston Properties Limited Partnership partners’ capital—1,717,626 and 1,715,092 general partner units and 151,887,340 and 151,864,874 limited partner units outstanding at March 31, 2016 and December 31, 2015, respectively	3,527,623	3,490,899
Total equity	5,285,158	5,258,922
Total liabilities and equity / capital	$ 18,838,670	$ 18,010,170