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Unconsolidated real estate joint ventures (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
ft²
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
ft²
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     $ 38,483,000   $ 38,483,000 $ 332,349,000  
Impairment of real estate         $ 52,675,000 48,078,000 $ 12,334,000
Unconsolidated Real Estate Joint Venture Debt              
Weighted Average Interest Rate at End of Period     3.44%   3.44%    
Long-term Debt     $ 8,791,866,000   $ 8,791,866,000    
Equity Method Investee              
Unconsolidated Real Estate Joint Venture Debt              
Debt instrument, borrowing capacity     668,250,000   668,250,000    
Long-term Debt     636,728,000   636,728,000    
Menlo Gateway | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     0   $ 0 300,622,000  
Proceeds from Sale of Real Estate     397,900,000        
Proceeds from sale of real estate, per RSF     1,430        
Contractual Sales Price of Real Estate     $ 541,500,000        
Area of Real Estate Property | ft²     772,983   772,983    
Equity interest percentage (in percent)     49.00%   49.00%    
Unconsolidated Real Estate Joint Venture Debt              
Long-term Debt     $ 143,600,000   $ 143,600,000    
1655 and 1715 Third Street | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     $ 14,034,000   $ 14,034,000 14,939,000  
Equity interest percentage (in percent)     10.00%   10.00%    
1655 and 1715 Third Street | Equity Method Investee | Secured debt maturing on 3/10/25              
Unconsolidated Real Estate Joint Venture Debt              
Maturity date         Mar. 10, 2025    
Stated interest rate (as a percent)     4.50%   4.50%    
Weighted Average Interest Rate at End of Period     4.57%   4.57%    
Debt instrument, borrowing capacity     $ 600,000,000   $ 600,000,000    
Long-term Debt     598,657,000   598,657,000    
1450 Research Boulevard | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     4,455,000   $ 4,455,000 0  
Area of Real Estate Property | ft² 42,679            
Equity interest percentage (in percent) 73.20%            
Payments to Acquire Interest in Joint Venture $ 4,000,000            
1450 Research Boulevard | Equity Method Investee | Secured debt maturing on 12/10/26              
Unconsolidated Real Estate Joint Venture Debt              
Maturity date         Dec. 10, 2026    
Debt instrument, borrowing capacity     13,000,000   $ 13,000,000    
Long-term Debt     $ 0   $ 0    
1450 Research Boulevard | Equity Method Investee | Secured debt maturing on 12/10/26 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Unconsolidated Real Estate Joint Venture Debt              
Stated interest rate (as a percent)     1.95%   1.95%    
101 West Dickman Street | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     $ 8,481,000   $ 8,481,000 0  
Area of Real Estate Property | ft² 135,423            
Equity interest percentage (in percent) 57.90%            
Payments to Acquire Interest in Joint Venture $ 8,300,000            
101 West Dickman Street | Equity Method Investee | Secured debt maturing on 11/10/26              
Unconsolidated Real Estate Joint Venture Debt              
Maturity date         Nov. 10, 2026    
Weighted Average Interest Rate at End of Period     2.81%   2.81%    
Debt instrument, borrowing capacity     $ 26,750,000   $ 26,750,000    
Long-term Debt     $ 9,947,000   $ 9,947,000    
101 West Dickman Street | Equity Method Investee | Secured debt maturing on 11/10/26 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Unconsolidated Real Estate Joint Venture Debt              
Stated interest rate (as a percent)     1.95%   1.95%    
704 Quince Orchard Road              
Schedule of Equity Method Investments              
Area of Real Estate Property | ft²     80,032   80,032    
704 Quince Orchard Road | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     $ 0   $ 0 $ 4,961,000  
Equity interest percentage (in percent)           56.80%  
1401/1413 Research Boulevard | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures   $ 0   $ 0      
Impairment of real estate       $ 7,600,000      
Area of Real Estate Property | ft²     90,000   90,000    
Equity interest percentage (in percent)     65.00%   65.00%    
Payments to Acquire Interest in Joint Venture   $ 578,000          
1401/1413 Research Boulevard | Equity Method Investee | Secured debt maturing on 12/23/24              
Unconsolidated Real Estate Joint Venture Debt              
Maturity date         Dec. 23, 2024    
Stated interest rate (as a percent)     2.70%   2.70%    
Weighted Average Interest Rate at End of Period     3.14%   3.14%    
Debt instrument, borrowing capacity     $ 28,500,000   $ 28,500,000    
Long-term Debt     28,124,000   28,124,000    
Other unconsolidated real estate joint ventures | Equity Method Investee              
Schedule of Equity Method Investments              
Investments in unconsolidated real estate joint ventures     $ 11,513,000   $ 11,513,000 $ 11,827,000