Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,497,031 and $7,481,015 at December 31, 2019 and 2018, respectively)	$ 22,502,976	$ 21,649,896
Right of use assets - finance leases (amount related to VIEs of $21,000 at December 31, 2019)	237,394
Right of use assets - operating leases	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,058,495) and $(965,500) at December 31, 2019 and 2018, respectively)	(5,266,798)	(4,897,777)
Total real estate	17,622,212	16,752,119
Cash and cash equivalents (amounts related to VIEs of $280,033 and $296,806 at December 31, 2019 and 2018, respectively)	644,950	543,359
Cash held in escrows	46,936	95,832
Investments in securities	36,747	28,198
Tenant and other receivables, net (amounts related to VIEs of $28,918 and $15,519 at December 31, 2019 and 2018, respectively)	112,807	86,629
Related party note receivable	80,000	80,000
Note receivable	15,920	19,468
Accrued rental income, net (amounts related to VIEs of $298,318 and $272,466 at December 31, 2019 and 2018, respectively)	1,038,788	934,896
Deferred charges, net (amounts related to VIEs of $214,769 and $263,402 at December 31, 2019 and 2018, respectively)	689,213	678,724
Prepaid expenses and other assets (amounts related to VIEs of $20,931 and $26,513 at December 31, 2019 and 2018, respectively)	41,685	80,943
Investments in unconsolidated joint ventures	955,647	956,309
Total assets	21,284,905	20,256,477
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,918,806 and $2,929,326 at December 31, 2019 and 2018, respectively)	2,922,408	2,964,572
Unsecured senior notes, net	8,390,459	7,544,697
Unsecured line of credit	0	0
Unsecured term loan, net	498,939	498,488
Lease liabilities - finance leases (amount related to VIEs of $20,189 at December 31, 2019)	224,042
Lease liabilities - operating leases	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $45,777 and $75,786 at December 31, 2019 and 2018, respectively)	377,553	276,645
Dividends and distributions payable	170,713	165,114
Accrued interest payable	90,016	89,267
Other liabilities (amounts related to VIEs of $140,110 and $200,344 at December 31, 2019 and 2018, respectively)	387,994	503,726
Total liabilities	13,262,304	12,042,509
Commitments and contingencies	0	0
Redeemable deferred stock units— 60,676 units outstanding at redemption value at December 31, 2019	8,365
Equity / Capital:
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding	0	0
Preferred stock, $0.01 par value, 50,000,000 shares authorized;
5.25% Series B cumulative redeemable preferred stock / units, liquidation preference $2,500 per share / unit, 80,000 shares / units issued and outstanding at December 31, 2019 and December 31, 2018, respectively	200,000	200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 154,869,198 and 154,537,378 issued and 154,790,298 and 154,458,478 outstanding at December 31, 2019 and December 31, 2018, respectively	1,548	1,545
Additional paid-in capital	6,294,719	6,407,623
Dividends in excess of earnings	(760,523)	(675,534)
Treasury common stock at cost, 78,900 shares at December 31, 2019 and December 31, 2018	(2,722)	(2,722)
Accumulated other comprehensive loss	(48,335)	(47,741)
Total stockholders' equity attributable to Boston Properties, Inc.	5,684,687	5,883,171
Noncontrolling interests:
Common units of the Operating Partnership	600,860	619,352
Property partnerships	1,728,689	1,711,445
Total equity / capital	8,014,236	8,213,968
Total liabilities and equity / capital	21,284,905	20,256,477
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,497,031 and $7,481,015 at December 31, 2019 and 2018, respectively)	22,107,755	21,251,540
Right of use assets - finance leases (amount related to VIEs of $21,000 at December 31, 2019)	237,394
Right of use assets - operating leases	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,058,495) and $(965,500) at December 31, 2019 and 2018, respectively)	(5,162,908)	(4,800,475)
Total real estate	17,330,881	16,451,065
Cash and cash equivalents (amounts related to VIEs of $280,033 and $296,806 at December 31, 2019 and 2018, respectively)	644,950	543,359
Cash held in escrows	46,936	95,832
Investments in securities	36,747	28,198
Tenant and other receivables, net (amounts related to VIEs of $28,918 and $15,519 at December 31, 2019 and 2018, respectively)	112,807	86,629
Related party note receivable	80,000	80,000
Note receivable	15,920	19,468
Accrued rental income, net (amounts related to VIEs of $298,318 and $272,466 at December 31, 2019 and 2018, respectively)	1,038,788	934,896
Deferred charges, net (amounts related to VIEs of $214,769 and $263,402 at December 31, 2019 and 2018, respectively)	689,213	678,724
Prepaid expenses and other assets (amounts related to VIEs of $20,931 and $26,513 at December 31, 2019 and 2018, respectively)	41,685	80,943
Investments in unconsolidated joint ventures	955,647	956,309
Total assets	20,993,574	19,955,423
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,918,806 and $2,929,326 at December 31, 2019 and 2018, respectively)	2,922,408	2,964,572
Unsecured senior notes, net	8,390,459	7,544,697
Unsecured line of credit	0	0
Unsecured term loan, net	498,939	498,488
Lease liabilities - finance leases (amount related to VIEs of $20,189 at December 31, 2019)	224,042
Lease liabilities - operating leases	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $45,777 and $75,786 at December 31, 2019 and 2018, respectively)	377,553	276,645
Dividends and distributions payable	170,713	165,114
Accrued interest payable	90,016	89,267
Other liabilities (amounts related to VIEs of $140,110 and $200,344 at December 31, 2019 and 2018, respectively)	387,994	503,726
Total liabilities	13,262,304	12,042,509
Commitments and contingencies	0	0
Redeemable deferred stock units— 60,676 units outstanding at redemption value at December 31, 2019	8,365
Redeemable partnership units—16,764,466 and 16,783,558 common units and 1,143,215 and 991,577 long term incentive units outstanding at redemption value at December 31, 2019 and December 31, 2018, respectively	2,468,753	2,000,591
Preferred stock, $0.01 par value, 50,000,000 shares authorized;
5.25% Series B cumulative redeemable preferred stock / units, liquidation preference $2,500 per share / unit, 80,000 shares / units issued and outstanding at December 31, 2019 and December 31, 2018, respectively	193,623	193,623
Boston Properties Limited Partnership partners’ capital—1,726,980 and 1,722,336 general partner units and 153,063,318 and 152,736,142 limited partner units outstanding at December 31, 2019 and December 31, 2018, respectively	3,380,175	4,054,996
Accumulated other comprehensive loss	(48,335)	(47,741)
Total partners’ capital	3,525,463	4,200,878
Noncontrolling interests in property partnerships	1,728,689	1,711,445
Noncontrolling interests:
Total equity / capital	5,254,152	5,912,323
Total liabilities and equity / capital	$ 20,993,574	$ 19,955,423