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Schedule of Unsecured Senior Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
May 05, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Senior Notes $ 9,636,397   $ 8,390,459
Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Senior Notes 9,636,397   $ 8,390,459
Boston Properties Limited Partnership | Senior Notes      
Debt Instrument [Line Items]      
Debt 9,700,000    
Debt Instrument, Unamortized Discount (16,880)    
Debt Issuance Costs, Net (46,723)    
Senior Notes $ 9,636,397    
Boston Properties Limited Partnership | Senior Notes | 4.289% unsecured senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.125%    
Debt Instrument, Interest Rate, Effective Percentage [1] 4.289%    
Debt $ 850,000    
Long-term Debt, Maturity Date [2] May 15, 2021    
Boston Properties Limited Partnership | Senior Notes | 3.954% unsecured senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.85%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.954%    
Debt $ 1,000,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.279%    
Debt $ 500,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.916%    
Debt $ 700,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.35%    
Debt $ 850,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.766%    
Debt $ 1,000,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.495%    
Debt $ 1,000,000    
Long-term Debt, Maturity Date [2] 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 [1] 4.628%    
Debt $ 1,000,000    
Long-term Debt, Maturity Date [2] 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 [1] 3.505%    
Debt $ 850,000    
Long-term Debt, Maturity Date [2] 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 [1] 2.984%    
Debt $ 700,000    
Long-term Debt, Maturity Date [2] Mar. 15, 2030    
Boston Properties Limited Partnership | Senior Notes | 3.343 % unsecured senior notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.25% 3.25%  
Debt Instrument, Interest Rate, Effective Percentage 3.343% [1] 3.343%  
Debt $ 1,250,000 $ 1,250,000  
Long-term Debt, Maturity Date [2] Jan. 30, 2031    
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
[2] No principal amounts are due prior to maturity.