SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) Employee Property Room	Sep. 30, 2021 USD ($) Employee Property Segment Room	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of employees \| Employee	203	203
Office, retail, multifamily, and mixed-use operating properties \| Property	30	30
Properties held for development \| Property	3	3
Number of operating segments \| Segment		4
Room in mixed-use segment all-suite hotel \| Room	369	369
Allowance for Doubtful Accounts, Rent Receivables \| $	$ 6.2	$ 6.2	$ 10.0
Deferred Rent Repayments - COVID-19 \| $	$ 0.8
Deferred Rent Repayments - COVID-19 (Percentage)	96.00%

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

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