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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Employee
Segment
Room
Property
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 09, 2014
Summary Of Significant Accounting Policies [Line Items]        
Number of employees | Employee 131      
Number of office, retail, multifamily and mixed-use operating properties | Property 23      
Properties held for development | Property 5      
Allowance for doubtful accounts $ (500,000) $ (800,000)    
Total bad debt expense 400,000 200,000 $ 100,000  
Real estate depreciation expense $ 54,200,000 56,000,000 52,000,000  
Short term liquid investments, initial maturity 3 months      
Cash balance at banks, federally insured amount $ 250,000      
Cash balance at banks, excess of FDIC insured limit 32,800,000 32,400,000    
Restricted cash $ 11,623,000 10,994,000    
Number of operating segments | Segment 4      
Room in mixed-use segment all-suite hotel | Room 369      
Money Market Funds        
Summary Of Significant Accounting Policies [Line Items]        
Cash balance at banks, excess of FDIC insured limit $ 100,000 20,000,000    
Term Loan        
Summary Of Significant Accounting Policies [Line Items]        
Line of credit interest rate (in percents)       3.08%
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of taxable income required to distribute to qualify as real estate investment trust (REIT) 90.00%      
Building And Improvement | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 30 years      
Building And Improvement | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 40 years      
Furniture And Equipment | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 3 years      
Furniture And Equipment | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 15 years      
Deferred Rent Receivables        
Summary Of Significant Accounting Policies [Line Items]        
Allowance for doubtful accounts $ (1,300,000) (1,200,000)    
Other Income        
Summary Of Significant Accounting Policies [Line Items]        
General excise tax recognized, gross $ 3,700,000 $ 3,400,000 $ 3,500,000