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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively) $ 23,711,400 $ 22,969,110
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively) 237,845 237,393
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively) (5,850,397) (5,534,102)
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively) 1,002,728 1,668,742
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively) 61,269 77,411
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively) 1,203,840 1,122,502
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively) 622,807 640,085
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively) 97,560 33,840
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively) 2,898,699 2,909,081
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively) 243,562 236,492
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively) 331,687 336,264
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively) $ 370,403 $ 412,084
Reddemable deferred stock units, units 80,989 72,966
Limited Partners' Capital Account, Units Outstanding (in units) 154,469,658  
General Partners' Capital Account, Units Outstanding (in units) 1,736,833  
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 156,285,391 155,797,725
Common Stock, Shares, Outstanding 156,206,491 155,718,825
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 $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively) $ 23,335,905 $ 22,592,301
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively) 237,845 237,393
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively) (5,739,625) (5,428,576)
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively) 1,002,728 1,668,742
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively) 61,269 77,411
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively) 1,203,840 1,122,502
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively) 622,807 640,085
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively) 97,560 33,840
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively) 2,898,699 2,909,081
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively) 243,562 236,492
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively) 331,687 336,264
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively) $ 370,403 $ 412,084
Reddemable deferred stock units, units 80,989 72,966
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding 15,989,304 16,037,121
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding 1,487,492 1,336,115
Limited Partners' Capital Account, Units Outstanding (in units) 154,469,658 153,987,904
General Partners' Capital Account, Units Outstanding (in units) 1,736,833 1,730,921
Series B Cumulative Redeemable Preferred Stock / Unit [Member]    
Preferred stock, par value   $ 0.01
Preferred stock, shares authorized   92,000
Preferred stock / units, shares / units issued (in shares / units)   80,000
Preferred stock / units, shares / units outstanding (in shares / units)   80,000
Series B Dividend Rate Percentage   5.25%
Series B Liquidation Preference Per Share/ Unit   $ 2,500
Variable Interest Entity, Primary Beneficiary [Member]    
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively) $ 6,688,647 $ 6,592,019
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively) 21,000 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively) (1,266,516) (1,158,548)
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively) 288,186 340,642
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively) 8,598 10,911
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively) 352,291 336,594
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively) 174,172 183,306
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively) 42,051 13,137
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively) 2,898,699 2,907,590
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively) 20,420 20,306
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively) 36,967 23,128
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively) 124,615 158,805
Variable Interest Entity, Primary Beneficiary [Member] | Boston Properties Limited Partnership    
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively) 6,688,647 6,592,019
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively) 21,000 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively) (1,266,516) (1,158,548)
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively) 288,186 340,642
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively) 8,598 10,911
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively) 352,291 336,594
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively) 174,172 183,306
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively) 42,051 13,137
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively) 2,898,699 2,907,590
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively) 20,420 20,306
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively) 36,967 23,128
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively) $ 124,615 $ 158,805
Boston Properties Limited Partnership | Series B Cumulative Redeemable Preferred Stock / Unit [Member]    
Preferred stock / units, shares / units issued (in shares / units)   80,000
Preferred stock / units, shares / units outstanding (in shares / units)   80,000
Series B Dividend Rate Percentage   5.25%
Series B Liquidation Preference Per Share/ Unit   $ 2,500