Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

Dispositions (Narrative) (Details) ft² in Thousands				1 Months Ended		3 Months Ended	12 Months Ended
Dispositions (Narrative) (Details) ft² in Thousands	Jun. 21, 2018 USD ($)	Jul. 17, 2017 USD ($) ft² development_asset myAptUnit myProperty	Dec. 21, 2016 USD ($)	Jul. 17, 2017 USD ($) ft² development_asset myAptUnit myProperty	Jun. 20, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016	Mar. 15, 2016 USD ($)
Dispositions
Net gains on sale of real estate and other							$ 0	$ 3,489,000	$ 5,074,000
Cash, cash equivalents, restricted cash and restricted cash equivalents, included in spin-off							0	416,237,000	0
Real estate impairment losses							$ (246,031,000)	$ (501,000)	(175,735,000)
Washington DC \| Skyline Properties
Dispositions
Mortgage loan outstanding											$ 678,000,000
Real estate impairment losses						$ 160,700,000
Interest expense									$ 7,823,000
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC
Dispositions
Disposal group, including discontinued operation, cash and proceeds from refinancing		$ 275,000,000		$ 275,000,000
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC \| Office
Dispositions
Number of real estate properties \| myProperty		37		37
Net rentable area \| ft²		11,100		11,100
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC \| Multifamily
Dispositions
Number of real estate properties \| myProperty		5		5
Number of units in real estate property (in number of residential units) \| myAptUnit		3,133		3,133
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC \| Other Property
Dispositions
Number of real estate properties \| myProperty		5		5
Net rentable area \| ft²		406		406
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC \| Future development assets
Dispositions
Number of development assets \| development_asset		18		18
Square footage of real estate property \| ft²		10,400		10,400
Discontinued Operations \| Washington DC \| Skyline Properties
Dispositions
Assets related to discontinued operations			$ 236,535,000
Liabilities related to discontinued operations			724,412,000
Gain on disposition of assets			$ 487,877,000
27 Washington Square North
Dispositions
Cash proceeds from sale of real estate	$ 45,000,000
Net gains on sale of real estate and other	$ 23,559,000
The Bartlett
Dispositions
Loans payable					$ 220,000,000
Debt term					5 years
The Bartlett \| Washington DC
Dispositions
Cash, cash equivalents, restricted cash and restricted cash equivalents, included in spin-off		$ 412,500,000
LIBOR \| The Bartlett
Dispositions
Spread Over LIBOR (in percentage)					1.70%
JBGS \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC
Dispositions
Repayments of debt		$ 43,581,000
JBGS \| The Bartlett \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC
Dispositions
Net proceeds from debt				$ 217,000,000
JBGS \| LIBOR \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff \| Washington DC
Dispositions
Spread Over LIBOR (in percentage)		1.25%
Minimum
Dispositions
Weighted average interest rate										3.00%
Maximum
Dispositions
Weighted average interest rate										4.50%
Measurement Input, Cap Rate \| Discontinued Operations \| Washington DC \| Skyline Properties
Dispositions
Real estate, measurement input						0.080
Measurement Input, Discount Rate \| Discontinued Operations \| Washington DC \| Skyline Properties
Dispositions
Real estate, measurement input						0.082