Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,564,762 and $6,497,031 at March 31, 2020 and December 31, 2019, respectively)	$ 22,342,209	$ 22,502,976
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2020 and December 31, 2019, respectively)	237,394	237,394
Right of use assets - operating leases	148,057	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,082,486) and$(1,058,495) at March 31, 2020 and December 31, 2019, respectively)	(5,209,487)	(5,266,798)
Total real estate	17,518,173	17,622,212
Cash and cash equivalents (amounts related to VIEs of $268,415 and $280,033 at March 31, 2020 and December 31, 2019, respectively)	660,733	644,950
Cash held in escrows	197,845	46,936
Investments in securities	28,101	36,747
Tenant and other receivables, net (amounts related to VIEs of $19,954 and $28,918 at March 31, 2020 and December 31, 2019, respectively)	89,431	112,807
Related party note receivable, net	78,800	80,000
Note receivable, net	15,794	15,920
Accrued rental income, net (amounts related to VIEs of $308,482 and $298,318 at March 31, 2020 and December 31, 2019, respectively)	1,059,677	1,038,788
Deferred charges, net (amounts related to VIEs of $205,688 and $214,769 at March 31, 2020 and December 31, 2019, respectively)	667,076	689,213
Prepaid expenses and other assets (amounts related to VIEs of $52,641 and $20,931 at March 31, 2020 and December 31, 2019, respectively)	136,730	41,685
Investments in unconsolidated joint ventures	1,377,338	955,647
Total assets	21,829,698	21,284,905
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,916,068 and $2,918,806 at March 31, 2020 and December 31, 2019, respectively)	2,919,157	2,922,408
Unsecured senior notes, net	8,393,009	8,390,459
Unsecured line of credit	250,000	0
Unsecured term loan, net	499,058	498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,198 and $20,189 at March 31, 2020 and December 31, 2019, respectively)	227,067	224,042
Lease liabilities - operating leases	200,573	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $28,437 and $45,777 at March 31, 2020 and December 31, 2019, respectively)	293,831	377,553
Dividends and distributions payable	171,026	170,713
Accrued interest payable	82,388	90,016
Other liabilities (amounts related to VIEs of $142,381 and $140,110 at March 31, 2020 and December 31, 2019, respectively)	366,852	387,994
Total liabilities	13,402,961	13,262,304
Commitments and contingencies	0	0
Redeemable deferred stock units— 63,475 and 60,676 units outstanding at redemption value at March 31, 2020 and December 31, 2019, respectively	5,854	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 March 31, 2020 and December 31, 2019, respectively	200,000	200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 155,393,455 and 154,869,198 issued and 155,314,555 and 154,790,298 outstanding at March 31, 2020 and December 31, 2019, respectively	1,553	1,548
Additional paid-in capital	6,321,475	6,294,719
Dividends in excess of earnings	(416,740)	(760,523)
Treasury common stock at cost, 78,900 shares at March 31, 2020 and December 31, 2019	(2,722)	(2,722)
Accumulated other comprehensive loss	(55,700)	(48,335)
Total stockholders' equity attributable to Boston Properties, Inc.	6,047,866	5,684,687
Noncontrolling interests:
Common units of the Operating Partnership	636,572	600,860
Property partnerships	1,736,445	1,728,689
Total equity / capital	8,420,883	8,014,236
Total liabilities and equity / capital	21,829,698	21,284,905
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,564,762 and $6,497,031 at March 31, 2020 and December 31, 2019, respectively)	21,959,932	22,107,755
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2020 and December 31, 2019, respectively)	237,394	237,394
Right of use assets - operating leases	148,057	148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,082,486) and$(1,058,495) at March 31, 2020 and December 31, 2019, respectively)	(5,107,243)	(5,162,908)
Total real estate	17,238,140	17,330,881
Cash and cash equivalents (amounts related to VIEs of $268,415 and $280,033 at March 31, 2020 and December 31, 2019, respectively)	660,733	644,950
Cash held in escrows	197,845	46,936
Investments in securities	28,101	36,747
Tenant and other receivables, net (amounts related to VIEs of $19,954 and $28,918 at March 31, 2020 and December 31, 2019, respectively)	89,431	112,807
Related party note receivable, net	78,800	80,000
Note receivable, net	15,794	15,920
Accrued rental income, net (amounts related to VIEs of $308,482 and $298,318 at March 31, 2020 and December 31, 2019, respectively)	1,059,677	1,038,788
Deferred charges, net (amounts related to VIEs of $205,688 and $214,769 at March 31, 2020 and December 31, 2019, respectively)	667,076	689,213
Prepaid expenses and other assets (amounts related to VIEs of $52,641 and $20,931 at March 31, 2020 and December 31, 2019, respectively)	136,730	41,685
Investments in unconsolidated joint ventures	1,377,338	955,647
Total assets	21,549,665	20,993,574
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,916,068 and $2,918,806 at March 31, 2020 and December 31, 2019, respectively)	2,919,157	2,922,408
Unsecured senior notes, net	8,393,009	8,390,459
Unsecured line of credit	250,000	0
Unsecured term loan, net	499,058	498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,198 and $20,189 at March 31, 2020 and December 31, 2019, respectively)	227,067	224,042
Lease liabilities - operating leases	200,573	200,180
Accounts payable and accrued expenses (amounts related to VIEs of $28,437 and $45,777 at March 31, 2020 and December 31, 2019, respectively)	293,831	377,553
Dividends and distributions payable	171,026	170,713
Accrued interest payable	82,388	90,016
Other liabilities (amounts related to VIEs of $142,381 and $140,110 at March 31, 2020 and December 31, 2019, respectively)	366,852	387,994
Total liabilities	13,402,961	13,262,304
Commitments and contingencies	0	0
Redeemable deferred stock units— 63,475 and 60,676 units outstanding at redemption value at March 31, 2020 and December 31, 2019, respectively	5,854	8,365
Redeemable partnership units— 16,421,888 and 16,764,466 common units and 1,343,299 and 1,143,215 long term incentive units outstanding at redemption value at March 31, 2020 and December 31, 2019, respectively	1,639,855	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 March 31, 2020 and December 31, 2019, respectively	193,623	193,623
Boston Properties Limited Partnership partners’ capital— 1,730,797 and 1,726,980 general partner units and 153,583,758 and 153,063,318 limited partner units outstanding at March 31, 2020 and December 31, 2019, respectively	4,626,627	3,380,175
Accumulated other comprehensive loss	(55,700)	(48,335)
Total partners’ capital	4,764,550	3,525,463
Noncontrolling interests in property partnerships	1,736,445	1,728,689
Noncontrolling interests:
Total equity / capital	6,500,995	5,254,152
Total liabilities and equity / capital	$ 21,549,665	$ 20,993,574