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Subsequent Events subsequent Events (Details)
Apr. 24, 2017
USD ($)
May 01, 2017
USD ($)
ft²
Apr. 23, 2017
USD ($)
Apr. 21, 2017
apartments
Apr. 19, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Subsequent Event [Line Items]              
Secured Debt           $ 2,046,959,000 $ 2,063,087,000
MacArhur BART Station [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Number of apartment units that could potentially be built under an option agreement | apartments       402      
767 5th Avenue (The General Motors Building) [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Effective Percentage 3.65%            
Ownership Percentage by the Company 60.00%            
Secured Debt $ 2,300,000,000            
Coupon/Stated Rate 3.43%            
30 Shattuck Road [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Contractual Sales Price         $ 5,000,000    
Revolving Credit Facility [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Line of Credit Facility, Current Borrowing Capacity $ 1,500,000,000   $ 1,000,000,000        
Line of Credit Facility, Commitment Fee Percentage 0.15%            
Delayed Draw Facility [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Line of Credit Facility, Current Borrowing Capacity $ 500,000,000            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%            
Current credit rating [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Margin added to Calculated Interest Rate 0.875%            
Current credit rating [Member] | Delayed Draw Facility [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Line of Credit Facility, Current Borrowing Capacity $ 0            
Margin added to Calculated Interest Rate 0.95%            
Interest Rate Swap [Member] | 767 5th Avenue (The General Motors Building) [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Notional Amount $ 450,000,000            
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion $ 14,400,000            
103 Carnegie Center [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Purchase price   $ 15,800,000          
Net Rentable Area (in sf) | ft²   96,000