Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,592,925 and $6,497,031 at September 30, 2020 and December 31, 2019, respectively)	$ 22,770,691	$ 22,502,976
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2020 and December 31, 2019, respectively)	237,382	237,394
Right of use assets - operating leases	146,973	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,134,450) and $(1,058,495) at September 30, 2020 and December 31, 2019, respectively)	(5,413,709)	(5,266,798)
Total real estate	17,741,337	17,622,212
Cash and cash equivalents (amounts related to VIEs of $267,229 and $280,033 at September 30, 2020 and December 31, 2019, respectively)	1,714,783	644,950
Cash held in escrows	50,006	46,936
Investments in securities	34,934	36,747
Tenant and other receivables, net (amounts related to VIEs of $12,968 and $28,918 at September 30, 2020 and December 31, 2019, respectively)	76,330	112,807
Related party note receivable, net	77,592	80,000
Notes receivable, net	25,304	15,920
Accrued rental income, net (amounts related to VIEs of $323,220 and $298,318 at September 30, 2020 and December 31, 2019, respectively)	1,111,078	1,038,788
Deferred charges, net (amounts related to VIEs of $187,025 and $214,769 at September 30, 2020 and December 31, 2019, respectively)	644,036	689,213
Prepaid expenses and other assets (amounts related to VIEs of $53,529 and $20,931 at September 30, 2020 and December 31, 2019, respectively)	106,524	41,685
Investments in unconsolidated joint ventures	1,377,291	955,647
Total assets	22,959,215	21,284,905
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,910,460 and $2,918,806 at September 30, 2020 and December 31, 2019, respectively)	2,912,494	2,922,408
Unsecured senior notes, net	9,636,397	8,390,459
Unsecured line of credit	0	0
Unsecured term loan, net	499,270	498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,266 and $20,189 at September 30, 2020 and December 31, 2019, respectively)	233,288	224,042
Lease liabilities - operating leases	201,337	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $26,848 and $45,777 at September 30, 2020 and December 31, 2019, respectively)	345,959	377,553
Dividends and distributions payable	171,070	170,713
Accrued interest payable	88,826	90,016
Other liabilities (amounts related to VIEs of $128,451 and $140,110 at September 30, 2020 and December 31, 2019, respectively)	369,932	387,994
Total liabilities	14,458,573	13,262,304
Commitments and contingencies	0	0
Redeemable deferred stock units— 69,787 and 60,676 units outstanding at redemption value at September 30, 2020 and December 31, 2019, respectively	5,604	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 September 30, 2020 and December 31, 2019, respectively	200,000	200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 155,715,200 and 154,869,198 issued and 155,636,300 and 154,790,298 outstanding at September 30, 2020 and December 31, 2019, respectively	1,556	1,548
Additional paid-in capital	6,348,076	6,294,719
Dividends in excess of earnings	(364,720)	(760,523)
Treasury common stock at cost, 78,900 shares at September 30, 2020 and December 31, 2019	(2,722)	(2,722)
Accumulated other comprehensive loss	(52,622)	(48,335)
Total stockholders' equity attributable to Boston Properties, Inc.	6,129,568	5,684,687
Noncontrolling interests:
Common units of the Operating Partnership	634,796	600,860
Property partnerships	1,730,674	1,728,689
Total equity / capital	8,495,038	8,014,236
Total liabilities and equity / capital	22,959,215	21,284,905
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,592,925 and $6,497,031 at September 30, 2020 and December 31, 2019, respectively)	22,393,882	22,107,755
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2020 and December 31, 2019, respectively)	237,382	237,394
Right of use assets - operating leases	146,973	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,134,450) and $(1,058,495) at September 30, 2020 and December 31, 2019, respectively)	(5,309,930)	(5,162,908)
Total real estate	17,468,307	17,330,881
Cash and cash equivalents (amounts related to VIEs of $267,229 and $280,033 at September 30, 2020 and December 31, 2019, respectively)	1,714,783	644,950
Cash held in escrows	50,006	46,936
Investments in securities	34,934	36,747
Tenant and other receivables, net (amounts related to VIEs of $12,968 and $28,918 at September 30, 2020 and December 31, 2019, respectively)	76,330	112,807
Related party note receivable, net	77,592	80,000
Notes receivable, net	25,304	15,920
Accrued rental income, net (amounts related to VIEs of $323,220 and $298,318 at September 30, 2020 and December 31, 2019, respectively)	1,111,078	1,038,788
Deferred charges, net (amounts related to VIEs of $187,025 and $214,769 at September 30, 2020 and December 31, 2019, respectively)	644,036	689,213
Prepaid expenses and other assets (amounts related to VIEs of $53,529 and $20,931 at September 30, 2020 and December 31, 2019, respectively)	106,524	41,685
Investments in unconsolidated joint ventures	1,377,291	955,647
Total assets	22,686,185	20,993,574
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,910,460 and $2,918,806 at September 30, 2020 and December 31, 2019, respectively)	2,912,494	2,922,408
Unsecured senior notes, net	9,636,397	8,390,459
Unsecured line of credit	0	0
Unsecured term loan, net	499,270	498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,266 and $20,189 at September 30, 2020 and December 31, 2019, respectively)	233,288	224,042
Lease liabilities - operating leases	201,337	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $26,848 and $45,777 at September 30, 2020 and December 31, 2019, respectively)	345,959	377,553
Dividends and distributions payable	171,070	170,713
Accrued interest payable	88,826	90,016
Other liabilities (amounts related to VIEs of $128,451 and $140,110 at September 30, 2020 and December 31, 2019, respectively)	369,932	387,994
Total liabilities	14,458,573	13,262,304
Commitments and contingencies	0	0
Redeemable deferred stock units— 69,787 and 60,676 units outstanding at redemption value at September 30, 2020 and December 31, 2019, respectively	5,604	8,365
Redeemable partnership units— 16,120,074 and 16,764,466 common units and 1,338,400 and 1,143,215 long term incentive units outstanding at redemption value at September 30, 2020 and December 31, 2019, respectively	1,406,484	2,468,753
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 September 30, 2020 and December 31, 2019, respectively	193,623	193,623
Boston Properties Limited Partnership partners’ capital— 1,730,948 and 1,726,980 general partner units and 153,905,352 and 153,063,318 limited partner units outstanding at September 30, 2020 and December 31, 2019, respectively	4,943,849	3,380,175
Accumulated other comprehensive loss	(52,622)	(48,335)
Total partners’ capital	5,084,850	3,525,463
Noncontrolling interests in property partnerships	1,730,674	1,728,689
Noncontrolling interests:
Total equity / capital	6,815,524	5,254,152
Total liabilities and equity / capital	$ 22,686,185	$ 20,993,574