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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
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
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)
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
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
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
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
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
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
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
Reddemable deferred stock units, units 69,787 60,676
Limited Partners' Capital Account, Units Outstanding (in units) 153,905,352  
General Partners' Capital Account, Units Outstanding (in units) 1,730,948  
Excess stock, par value $ 0.01 $ 0.01
Excess stock, shares authorized 150,000,000 150,000,000
Excess stock, shares outstanding 0 0
Excess stock, shares issued 0 0
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 155,715,200 154,869,198
Common Stock, Shares, Outstanding 155,636,300 154,790,298
Treasury common stock at cost, shares 78,900 78,900
Boston Properties Limited Partnership    
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
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)
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
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
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
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
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
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
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
Reddemable deferred stock units, units 69,787 60,676
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding 16,120,074 16,764,466
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding 1,338,400 1,143,215
Limited Partners' Capital Account, Units Outstanding (in units) 153,905,352 153,063,318
General Partners' Capital Account, Units Outstanding (in units) 1,730,948 1,726,980
Series B Cumulative Redeemable Preferred Stock / Unit [Member]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 92,000 92,000
Preferred stock / units, shares / units issued (in shares / units) 80,000 80,000
Preferred stock / units, shares / units outstanding (in shares / units) 80,000 80,000
Series B Dividend Rate Percentage 5.25% 5.25%
Series B Liquidation Preference Per Share/ Unit $ 2,500.00 $ 2,500
Series B Cumulative Redeemable Preferred Stock / Unit [Member] | Boston Properties Limited Partnership    
Preferred stock / units, shares / units issued (in shares / units) 80,000 80,000
Preferred stock / units, shares / units outstanding (in shares / units) 80,000 80,000
Series B Dividend Rate Percentage 5.25% 5.25%
Series B Liquidation Preference Per Share/ Unit $ 2,500 $ 2,500
Variable Interest Entity, Primary Beneficiary [Member]    
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) $ 6,592,925 $ 6,497,031
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) 21,000 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,134,450) and $(1,058,495) at September 30, 2020 and December 31, 2019, respectively) (1,134,450) (1,058,495)
Cash and cash equivalents (amounts related to VIEs of $267,229 and $280,033 at September 30, 2020 and December 31, 2019, respectively) 267,229 280,033
Tenant and other receivables, net (amounts related to VIEs of $12,968 and $28,918 at September 30, 2020 and December 31, 2019, respectively) 12,968 28,918
Accrued rental income, net (amounts related to VIEs of $323,220 and $298,318 at September 30, 2020 and December 31, 2019, respectively) 323,220 298,318
Deferred charges, net (amounts related to VIEs of $187,025 and $214,769 at September 30, 2020 and December 31, 2019, respectively) 187,025 214,769
Prepaid expenses and other assets (amounts related to VIEs of $53,529 and $20,931 at September 30, 2020 and December 31, 2019, respectively) 53,529 20,931
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) 2,910,460 2,918,806
Lease liabilities - finance leases (amounts related to VIEs of $20,266 and $20,189 at September 30, 2020 and December 31, 2019, respectively) 20,266 20,189
Accounts payable and accrued expenses (amounts related to VIEs of $26,848 and $45,777 at September 30, 2020 and December 31, 2019, respectively) 26,848 45,777
Other liabilities (amounts related to VIEs of $128,451 and $140,110 at September 30, 2020 and December 31, 2019, respectively) 128,451 140,110
Variable Interest Entity, Primary Beneficiary [Member] | Boston Properties Limited Partnership    
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) 6,592,925 6,497,031
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) 21,000 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,134,450) and $(1,058,495) at September 30, 2020 and December 31, 2019, respectively) (1,134,450) (1,058,495)
Cash and cash equivalents (amounts related to VIEs of $267,229 and $280,033 at September 30, 2020 and December 31, 2019, respectively) 267,229 280,033
Tenant and other receivables, net (amounts related to VIEs of $12,968 and $28,918 at September 30, 2020 and December 31, 2019, respectively) 12,968 28,918
Accrued rental income, net (amounts related to VIEs of $323,220 and $298,318 at September 30, 2020 and December 31, 2019, respectively) 323,220 298,318
Deferred charges, net (amounts related to VIEs of $187,025 and $214,769 at September 30, 2020 and December 31, 2019, respectively) 187,025 214,769
Prepaid expenses and other assets (amounts related to VIEs of $53,529 and $20,931 at September 30, 2020 and December 31, 2019, respectively) 53,529 20,931
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) 2,910,460 2,918,806
Lease liabilities - finance leases (amounts related to VIEs of $20,266 and $20,189 at September 30, 2020 and December 31, 2019, respectively) 20,266 20,189
Accounts payable and accrued expenses (amounts related to VIEs of $26,848 and $45,777 at September 30, 2020 and December 31, 2019, respectively) 26,848 45,777
Other liabilities (amounts related to VIEs of $128,451 and $140,110 at September 30, 2020 and December 31, 2019, respectively) $ 128,451 $ 140,110