Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Employee Segment Room Property	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Lease, Practical Expedient, Lease and Non-lease Components	$ 38,400,000
Document Period End Date	Dec. 31, 2019
Number of employees | Employee	206
Number of office, retail, multifamily and mixed-use operating properties | Property	28
Properties held for development | Property	3
Allowance for doubtful accounts	$ (1,200,000)	$ (600,000)
Total bad debt expense	1,800,000	800,000	$ 800,000
Real estate depreciation expense	$ 85,300,000	99,600,000	70,200,000
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	36,200,000	42,400,000
Restricted cash	10,148,000	9,316,000	9,344,000
Incremental stock compensation cost from modification	$ 0	0	2,200,000
Number of operating segments | Segment	4
Rooms in mixed-use segment all-suite hotel | Room	369
Future minimum lease payments due	$ 5,600,000
Right-of-use asset, net	4,863,000	0		$ 7,700,000
Straight-line rent liability	16,903,000	7,393,000		$ 800,000
Lease liability	5,380,000	0
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Cash balance at banks, excess of FDIC insured limit	$ 52,500,000	200,000
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	$ (500,000)	(300,000)
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 3,500,000	$ 3,600,000	$ 3,700,000