The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions - Additional Information (Details) ft² in Thousands	Jun. 23, 2019 USD ($) ft²	Jun. 30, 2019 ft²
Business Acquisition [Line Items]
Area of office and retail properties \| ft²		12,200
55 Second Street [Member]
Business Acquisition [Line Items]
Area of office and retail properties \| ft²	387
Payments to acquire real estate \| $	$ 407,800,000
55 Second Street [Member] \| Other Assets [Member]
Business Acquisition [Line Items]
Deposit for acquisition \| $	$ 20,000,000