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Unsecured Senior Notes (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 18, 2019
Sep. 03, 2019
Jun. 21, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Total $ 8,387,913       $ 7,544,697
Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Total 8,387,913       $ 7,544,697
Boston Properties Limited Partnership | Senior Notes [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 8,450,000        
Net unamortized discount 18,232        
Deferred financing costs, net 43,855        
Total $ 8,387,913        
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 5.708% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   5.625%      
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 4.289% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.125%        
Debt Instrument, Interest Rate, Effective Percentage [1] 4.289%        
Long-term Debt, Gross $ 850,000        
Debt Instrument, Maturity Date [2] May 15, 2021        
Boston Properties Limited Partnership | Senior Notes [Member] | 11 Year Unsecured Senior Notes 3.954%[Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.85%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.954%        
Long-term Debt, Gross $ 1,000,000        
Debt Instrument, Maturity Date [2] Feb. 01, 2023        
Boston Properties Limited Partnership | Senior Notes [Member] | 10.5 year Unsecured Senior Notes 3.279% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.125%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.279%        
Long-term Debt, Gross $ 500,000        
Debt Instrument, Maturity Date [2] Sep. 01, 2023        
Boston Properties Limited Partnership | Senior Notes [Member] | 10.5 Year Unsecured Senior Notes 3.916%[Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.80%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.916%        
Long-term Debt, Gross $ 700,000        
Debt Instrument, Maturity Date [2] Feb. 01, 2024        
Boston Properties Limited Partnership | Senior Notes [Member] | 7 Year Unsecured Senior Notes 3.350% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.20%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.35%        
Long-term Debt, Gross $ 850,000        
Debt Instrument, Maturity Date [2] Jan. 15, 2025        
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.766%[Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.65%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.766%        
Long-term Debt, Gross $ 1,000,000        
Debt Instrument, Maturity Date [2] Feb. 01, 2026        
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.495% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.75%        
Debt Instrument, Interest Rate, Effective Percentage [1] 3.495%        
Long-term Debt, Gross $ 1,000,000        
Debt Instrument, Maturity Date [2] Oct. 01, 2026        
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 4.628%[Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.50%        
Debt Instrument, Interest Rate, Effective Percentage [1] 4.628%        
Long-term Debt, Gross $ 1,000,000        
Debt Instrument, Maturity Date [2] Dec. 01, 2028        
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.505% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.40%     3.40%  
Debt Instrument, Interest Rate, Effective Percentage [1] 3.505%     3.505%  
Long-term Debt, Gross $ 850,000     $ 850,000  
Debt Instrument, Maturity Date [2] Jun. 21, 2029        
Boston Properties Limited Partnership | Senior Notes [Member] | 10.5 Year Unsecured Senior Notes 2.984% [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.90%   2.90%    
Debt Instrument, Interest Rate, Effective Percentage [1] 2.984%   2.984%    
Long-term Debt, Gross $ 700,000   $ 700,000    
Debt Instrument, Maturity Date [2] Mar. 15, 2030        
[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.