Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Employee Segment Property Room	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Document Period End Date	Dec. 31, 2016
Number of employees | Employee	164
Number of office, retail, multifamily and mixed-use operating properties | Property	24
Properties held for development | Property	4
Allowance for doubtful accounts	$ (400,000)	$ (500,000)
Total bad debt expense	800,000	400,000	$ 200,000
Real estate depreciation expense	$ 62,500,000	54,200,000	56,000,000
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	37,100,000	32,800,000
Restricted cash	$ 9,950,000	11,623,000
Number of operating segments | Segment	4
Rooms 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	$ 200,000	100,000
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)	(1,300,000)
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 3,800,000	3,700,000	$ 3,400,000
Rancho Carmel Plaza
Summary Of Significant Accounting Policies [Line Items]
Gain on sale of property		$ 7,100,000