Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Property rentals	$ 152,795	$ 152,857	$ 151,444
Expense reimbursements	80,030	77,717	75,492
Total revenues	232,825	230,574	226,936
EXPENSES
Operating, including fees to Vornado of $4,700, $4,671 and $4,590, respectively	93,775	85,127	82,232
Depreciation and amortization	33,089	34,925	33,807
General and administrative, including management fees to Vornado of $2,380 in each year	5,339	5,252	5,436
Total expenses	132,203	125,304	121,475
OPERATING INCOME	100,622	105,270	105,461
Interest and other income, net	12,546	6,716	3,305
Interest and debt expense	(44,533)	(31,474)	(22,241)
Change in fair value of marketable securities (see Note 5)	(11,990)	0	0
Income before income taxes	56,645	80,512	86,525
Income tax expense	(4)	(3)	(48)
Income from continuing operations	56,641	80,509	86,477
Loss from discontinued operations (see Note 6)	(23,797)	0	0
Net income	$ 32,844	$ 80,509	$ 86,477
Income from continuing operations - basic and diluted (in usd per share)	$ 11.07	$ 15.74	$ 16.91
Loss from discontinued operations (see Note 6) - basic and diluted (in usd per share)	(4.65)	0.00	0.00
Net income per common share - basic and diluted (in dollars per share)	$ 6.42	$ 15.74	$ 16.91
Weighted average shares outstanding - basic and diluted (in shares)	5,116,838	5,115,501	5,114,084