Condensed Combined Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net income attributable to JBG SMITH Properties	$ 17,659	$ 28,330
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	66,563	67,806
Straight-line rent	(6,829)	(5,461)
Equity in (income) loss of unconsolidated real estate ventures	(314)	1,536
Accretion of below-market lease intangibles, net	(687)	(673)
Operating distributions from unconsolidated real estate ventures	628	777
Other non-cash adjustments	4,408	5,399
Changes in operating assets and liabilities:
Tenant and other receivables	4,472	134
Other assets, net	(14,868)	(7,214)
Accounts payable and accrued expenses	359	6,122
Other liabilities, net	1,267	(5,836)
Net cash provided by operating activities	72,658	90,920
INVESTING ACTIVITIES:
Development costs, construction in progress and real estate additions	(54,747)	(123,519)
Restricted cash	(472)	272
Other investments	(1,396)	(1,529)
Investments in unconsolidated real estate ventures	(14)	(19,965)
Net cash used in investing activities	(56,629)	(144,741)
FINANCING ACTIVITIES:
Contributions from Vornado Realty Trust, net	21,203	1,487
Proceeds from borrowings from Vornado Realty Trust	4,000	28,500
Repayments of borrowings	(6,689)	(4,858)
Distributions to noncontrolling interests	0	(7)
Debt issuance costs	(2,930)	(4)
Proceeds from borrowings	220,000	0
Net cash provided by financing activities	235,584	25,118
Net increase (decrease) in cash and cash equivalents	251,613	(28,703)
Cash and cash equivalents at beginning of the period	29,000	74,966
Cash and cash equivalents at end of the period	280,613	46,263
SUPPLEMENTAL DISCLOSURE OF CASH FLOW AND NON-CASH INFORMATION:
Transfer of mortgage payable to Vornado Realty Trust	0	115,022
Cash paid for interest (net of capitalized interest of $917 and $2,761 in 2017 and 2016, respectively)	22,719	19,907
Accrued capital expenditures included in accounts payable and accrued expenses	1,475	44,754
Write-off of fully depreciated assets	(12,946)	(43,027)
Cash payments for income taxes	$ 706	$ 762