Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,000,820 and $6,760,078 at June 30, 2017 and December 31, 2016, respectively)	$ 20,614,366	$ 20,147,263
Less: accumulated depreciation (amounts related to VIEs of $(799,299) and $(758,640) at June 30, 2017 and December 31, 2016, respectively)	(4,379,446)	(4,222,235)
Total real estate	16,234,920	15,925,028
Cash and cash equivalents (amounts related to VIEs of $322,574 and $253,999 at June 30, 2017 and December 31, 2016, respectively)	492,435	356,914
Cash held in escrows (amounts related to VIEs of $4,360 and $4,955 at June 30, 2017 and December 31, 2016, respectively)	47,345	63,174
Investments in securities	26,781	23,814
Tenant and other receivables (amounts related to VIEs of $17,950 and $23,525 at June 30, 2017 and December 31, 2016, respectively)	88,687	92,548
Accrued rental income (amounts related to VIEs of $227,199 and $224,185 at June 30, 2017 and December 31, 2016, respectively)	820,022	799,138
Deferred charges, net (amounts related to VIEs of $267,240 and $290,436 at June 30, 2017 and December 31, 2016, respectively)	658,219	686,163
Prepaid expenses and other assets (amounts related to VIEs of $41,819 and $42,718 at June 30, 2017 and December 31, 2016, respectively)	93,985	129,666
Investments in unconsolidated joint ventures	819,368	775,198
Total assets	19,281,762	18,851,643
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,943,890 and $2,018,483 at June 30, 2017 and December 31, 2016, respectively)	2,986,283	2,063,087
Unsecured senior notes, net	7,250,356	7,245,953
Unsecured line of credit	0	0
Unsecured term loan	0	0
Mezzanine notes payable (amounts related to VIEs of $0 and $307,093 at June 30, 2017 and December 31, 2016, respectively)	0	307,093
Outside members’ notes payable (amounts related to VIEs of $0 and $180,000 at June 30, 2017 and December 31, 2016, respectively)	0	180,000
Accounts payable and accrued expenses (amounts related to VIEs of $116,413 and $110,457 at June 30, 2017 and December 31, 2016, respectively)	303,559	298,524
Dividends and distributions payable	130,432	130,308
Accrued interest payable (amounts related to VIEs of $6,706 and $162,226 at June 30, 2017 and December 31, 2016, respectively)	85,172	243,933
Other liabilities (amounts related to VIEs of $159,529 and $175,146 at June 30, 2017 and December 31, 2016, respectively)	452,608	450,821
Total liabilities	11,208,410	10,919,719
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 authorized, 80,000 shares/units issued and outstanding at June 30, 2017 and December 31, 2016	200,000	200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 154,386,429 and 153,869,075 issued and 154,307,529 and 153,790,175 outstanding at June 30, 2017 and December 31, 2016, respectively	1,543	1,538
Additional paid-in capital	6,363,034	6,333,424
Dividends in excess of earnings	(694,320)	(693,694)
Treasury common stock at cost, 78,900 shares at June 30, 2017 and December 31, 2016	(2,722)	(2,722)
Accumulated other comprehensive loss	(53,161)	(52,251)
Total stockholders’ equity attributable to Boston Properties, Inc.	5,814,374	5,786,295
Noncontrolling interests:
Common units of Boston Properties Limited Partnership	604,997	614,982
Property partnerships	1,653,981	1,530,647
Total equity / capital	8,073,352	7,931,924
Total liabilities and equity / capital	19,281,762	18,851,643
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,000,820 and $6,760,078 at June 30, 2017 and December 31, 2016, respectively)	20,202,321	19,733,872
Less: accumulated depreciation (amounts related to VIEs of $(799,299) and $(758,640) at June 30, 2017 and December 31, 2016, respectively)	(4,290,112)	(4,136,364)
Total real estate	15,912,209	15,597,508
Cash and cash equivalents (amounts related to VIEs of $322,574 and $253,999 at June 30, 2017 and December 31, 2016, respectively)	492,435	356,914
Cash held in escrows (amounts related to VIEs of $4,360 and $4,955 at June 30, 2017 and December 31, 2016, respectively)	47,345	63,174
Investments in securities	26,781	23,814
Tenant and other receivables (amounts related to VIEs of $17,950 and $23,525 at June 30, 2017 and December 31, 2016, respectively)	88,687	92,548
Accrued rental income (amounts related to VIEs of $227,199 and $224,185 at June 30, 2017 and December 31, 2016, respectively)	820,022	799,138
Deferred charges, net (amounts related to VIEs of $267,240 and $290,436 at June 30, 2017 and December 31, 2016, respectively)	658,219	686,163
Prepaid expenses and other assets (amounts related to VIEs of $41,819 and $42,718 at June 30, 2017 and December 31, 2016, respectively)	93,985	129,666
Investments in unconsolidated joint ventures	819,368	775,198
Total assets	18,959,051	18,524,123
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,943,890 and $2,018,483 at June 30, 2017 and December 31, 2016, respectively)	2,986,283	2,063,087
Unsecured senior notes, net	7,250,356	7,245,953
Unsecured line of credit	0	0
Unsecured term loan	0	0
Mezzanine notes payable (amounts related to VIEs of $0 and $307,093 at June 30, 2017 and December 31, 2016, respectively)	0	307,093
Outside members’ notes payable (amounts related to VIEs of $0 and $180,000 at June 30, 2017 and December 31, 2016, respectively)	0	180,000
Accounts payable and accrued expenses (amounts related to VIEs of $116,413 and $110,457 at June 30, 2017 and December 31, 2016, respectively)	303,559	298,524
Dividends and distributions payable	130,432	130,308
Accrued interest payable (amounts related to VIEs of $6,706 and $162,226 at June 30, 2017 and December 31, 2016, respectively)	85,172	243,933
Other liabilities (amounts related to VIEs of $159,529 and $175,146 at June 30, 2017 and December 31, 2016, respectively)	452,608	450,821
Total liabilities	11,208,410	10,919,719
Commitments and contingencies	0	0
Noncontrolling interest:
Redeemable partnership units—16,823,685 and 17,079,511 common units and 816,982 and 904,588 long term incentive units outstanding at redemption value at June 30, 2017 and December 31, 2016, respectively	2,170,155	2,262,040
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 authorized, 80,000 shares/units issued and outstanding at June 30, 2017 and December 31, 2016	193,623	193,623
Accumulated other comprehensive loss	(61,867)	(60,853)
Noncontrolling interests:
Boston Properties Limited Partnership partners’ capital—1,719,482 and 1,717,743 general partner units and 152,588,047 and 152,072,432 limited partner units outstanding at June 30, 2017 and December 31, 2016, respectively	3,732,882	3,618,094
Noncontrolling interests in property partnerships	1,653,981	1,530,647
Total equity / capital	5,580,486	5,342,364
Total liabilities and equity / capital	$ 18,959,051	$ 18,524,123