Condensed Combined Statement of Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total		Common Shares	Additional Paid-In Capital	Accumulated Deficit	Former Parent Equity		Noncontrolling Interests in Consolidated Subsidiaries
BALANCE (beginning of period) at Dec. 31, 2016	$ 2,121,984					$ 2,121,689		$ 295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to JBG SMITH Properties	(57,851)				$ (28,827)	(29,024)	[1]
Deferred compensation shares and options, net	1,526					1,526
Contributions from Vornado Realty Trust, net	334,843					334,843
Issuance of common limited partnership units to Vornado Realty Trust at the separation	(96,632)					(96,632)
Issuance of common shares to former parent at the Separation (in shares)			94,736,000
Issuance of common shares at the Separation	2,332,402	[2]	$ 947	$ 2,331,455		(2,332,402)
Issuance of common shares in connection with the Combination (in shares)			23,221,000
Issuance of common shares in connection with the Combination	864,918	[2]	$ 233	864,685
Noncontrolling interests acquired in connection with the Combination	3,987							3,987
Distributions to noncontrolling interests	(14)							(14)
Contributions from noncontrolling interests	134							134
Adjustment to record redeemable noncontrolling interest at redemption value	$ (97,084)			(97,084)
Common shares outstanding (in shares) at Sep. 30, 2017	117,957,000		117,957,000
BALANCE, (end of period) at Sep. 30, 2017	$ 3,075,811		$ 1,180	$ 3,099,056	$ (28,827)	$ 0		$ 4,402

[1] Net loss earned from January 1, 2017 through July 17, 2017 is attributable to our former parent as it was the sole shareholder prior to July 17, 2017. See Note 1 for additional information.

[2] See Note 3 for information about assets, liabilities and noncontrolling interests acquired in the Formation Transaction.