Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014 USD ($) Employee Segment Room Property	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jan. 09, 2014
Summary Of Significant Accounting Policies [Line Items]
Number of employees | Employee	113
Number of office, retail, multifamily and mixed-use operating properties | Property	23
Properties held for development | Property	5
Allowance for doubtful accounts	$ (800,000)	$ (1,000,000)
Total bad debt expense	200,000	100,000	$ 600,000
Real estate depreciation expense	$ 56,000,000	52,000,000	47,800,000
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	$ 32,400,000	29,000,000
Restricted cash	$ 10,994,000	9,124,000
Number of operating segments | Segment	4
Room in mixed-use segment all-suite hotel | Room	369
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%
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Cash balance at banks, excess of FDIC insured limit	$ 20,000,000	11,000,000
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	$ (1,200,000)	(1,200,000)
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 3,400,000	$ 3,500,000	$ 3,300,000
Term Loan
Summary Of Significant Accounting Policies [Line Items]
Line of credit interest rate (in percents)				3.08%