XML 92 R67.htm IDEA: XBRL DOCUMENT v3.22.4
Unsecured Senior Notes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 17, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Proceeds from unsecured senior notes   $ 749,557 $ 1,695,996 $ 1,248,125
Boston Properties Limited Partnership        
Debt Instrument [Line Items]        
Proceeds from unsecured senior notes   749,557 $ 1,695,996 $ 1,248,125
Senior Notes | Boston Properties Limited Partnership        
Debt Instrument [Line Items]        
Debt   $ 10,300,000    
Debt Instrument, Covenant Description   The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt.    
Leverage ratio   60.00%    
Secured debt leverage ratio - maximum   50.00%    
Interest Coverage - Maximum   1.50    
Unencumbered Asset Value - Minimum   150.00%    
Debt Instrument, Covenant Compliance   At December 31, 2022, BPLP was in compliance with each of these financial restrictions and requirements.    
6.924% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership        
Debt Instrument [Line Items]        
Debt $ 750,000 $ 750,000    
Debt Instrument, Interest Rate, Stated Percentage 6.75% 6.75%    
Senior Notes Pricing 99.941%      
Debt Instrument, Interest Rate, Effective Percentage 6.924% 6.924% [1]    
Proceeds from unsecured senior notes $ 743,500      
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.