Background and Basis of Presentation (Details) ft² in Millions	9 Months Ended
Sep. 30, 2020 a ft² property segment
Property, Plant and Equipment [Line Items]
Number of segments \| segment	3
Gross leasable area (in sq.ft) \| ft²	3.9
Area of ground leases owned (acres) \| a	153.7
Retail centers
Property, Plant and Equipment [Line Items]
Number of properties	22
Industrial assets
Property, Plant and Equipment [Line Items]
Number of properties	10
Office properties
Property, Plant and Equipment [Line Items]
Number of properties	4

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=120311839&loc=d3e8672-108599

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration