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Schedule of Unsecured Senior Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 29, 2021
Mar. 16, 2021
Feb. 14, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Senior Notes $ 10,479,651       $ 9,639,287
Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Senior Notes 10,479,651       $ 9,639,287
Boston Properties Limited Partnership | Senior Notes          
Debt Instrument [Line Items]          
Debt 10,550,000        
Debt Instrument, Unamortized Discount 17,581        
Debt Issuance Costs, Net 52,768        
Senior Notes $ 10,479,651        
Boston Properties Limited Partnership | Senior Notes | 3.954% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage [1] 3.85%        
Debt Instrument, Interest Rate, Effective Percentage [1],[2] 3.954%        
Debt [1] $ 1,000,000        
Long-term Debt, Maturity Date [1],[3] Feb. 01, 2023        
Boston Properties Limited Partnership | Senior Notes | 3.279% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.125%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.279%        
Debt $ 500,000        
Long-term Debt, Maturity Date [3] Sep. 01, 2023        
Boston Properties Limited Partnership | Senior Notes | 3.916% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.80%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.916%        
Debt $ 700,000        
Long-term Debt, Maturity Date [3] Feb. 01, 2024        
Boston Properties Limited Partnership | Senior Notes | 3.350% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.20%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.35%        
Debt $ 850,000        
Long-term Debt, Maturity Date [3] Jan. 15, 2025        
Boston Properties Limited Partnership | Senior Notes | 3.766% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.65%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.766%        
Debt $ 1,000,000        
Long-term Debt, Maturity Date [3] Feb. 01, 2026        
Boston Properties Limited Partnership | Senior Notes | 3.495% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.75%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.495%        
Debt $ 1,000,000        
Long-term Debt, Maturity Date [3] Oct. 01, 2026        
Boston Properties Limited Partnership | Senior Notes | 4.628% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.50%        
Debt Instrument, Interest Rate, Effective Percentage [2] 4.628%        
Debt $ 1,000,000        
Long-term Debt, Maturity Date [3] Dec. 01, 2028        
Boston Properties Limited Partnership | Senior Notes | 3.505% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.40%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.505%        
Debt $ 850,000        
Long-term Debt, Maturity Date [3] Jun. 21, 2029        
Boston Properties Limited Partnership | Senior Notes | 2.984% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.90%        
Debt Instrument, Interest Rate, Effective Percentage [2] 2.984%        
Debt $ 700,000        
Long-term Debt, Maturity Date [3] Mar. 15, 2030        
Boston Properties Limited Partnership | Senior Notes | 3.343 % unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
Debt Instrument, Interest Rate, Effective Percentage [2] 3.343%        
Debt $ 1,250,000        
Long-term Debt, Maturity Date [3] Jan. 30, 2031        
Boston Properties Limited Partnership | Senior Notes | 2.671% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.55%   2.55%    
Debt Instrument, Interest Rate, Effective Percentage 2.671% [2]   2.671%    
Debt $ 850,000   $ 850,000    
Long-term Debt, Maturity Date [3] Apr. 01, 2032        
Boston Properties Limited Partnership | Senior Notes | 4.289% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       4.125%  
Debt       $ 850,000  
Boston Properties Limited Partnership | Senior Notes | 2.524% unsecured senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.45% 2.45%      
Debt Instrument, Interest Rate, Effective Percentage 2.524% [2] 2.524%      
Debt $ 850,000 $ 850,000      
Long-term Debt, Maturity Date [3] Oct. 01, 2033        
[1] See Note 15.
[2] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
[3] No principal amounts are due prior to maturity.(3)See Note 15.