Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Employee Segment Property Room	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Lease, Practical Expedient, Lease and Non-lease Components	$ 37,600,000	$ 38,400,000
Document Period End Date	Dec. 31, 2020
Number of employees | Employee	189
Number of office, retail, multifamily and mixed-use operating properties | Property	28
Properties held for development | Property	3
Allowance for doubtful accounts	$ (10,000,000.0)	(1,200,000)
Total bad debt expense	18,400,000	1,800,000	$ 800,000
Real estate depreciation expense	$ 95,800,000	85,300,000	99,600,000
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	33,000,000.0	36,200,000
Restricted cash	1,716,000	10,148,000	9,316,000
Incremental stock compensation cost from modification	$ 1,200,000	0	0
Number of operating segments | Segment	4
Rooms in mixed-use segment all-suite hotel | Room	369
Future minimum lease payments due	$ 36,400,000	5,600,000
Right-of-use asset, net	29,350,000	4,863,000		$ 7,700,000
Straight-line rent liability	18,049,000	16,903,000		$ 800,000
Lease liability	30,060,000	5,380,000
Rent concessions - COVID-19	$ 13,400,000
Rent Concessions - COVID-19 (Percentage)	4.00%
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Cash balance at banks, excess of FDIC insured limit	$ 97,800,000	52,500,000
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
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 2,300,000	$ 3,500,000	$ 3,600,000