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Unsecured Senior Notes (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
May 15, 2023
Jun. 30, 2023
Jun. 30, 2022
Debt Instrument [Line Items]      
Proceeds from unsecured senior notes   $ 747,727 $ 0
Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Proceeds from unsecured senior notes   747,727 $ 0
Senior Notes | Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Debt   $ 11,050,000  
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 - Minimum   1.50  
Unencumbered Asset Value - Minimum   150.00%  
Debt Instrument, Covenant Compliance   At June 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.  
6.619% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Debt $ 750,000 $ 750,000  
Debt Instrument, Interest Rate, Stated Percentage 6.50% 6.50%  
Senior Notes Pricing 99.697%    
Debt Instrument, Interest Rate, Effective Percentage 6.619% 6.619% [1]  
Proceeds from unsecured senior notes $ 741,300    
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.