Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES
Property rentals	$ 152,857	$ 151,444	$ 138,688
Expense reimbursements	77,717	75,492	69,227
Total revenues	230,574	226,936	207,915
EXPENSES
Operating, including fees to Vornado of $4,671, $4,590, and $4,476, respectively	85,127	82,232	76,218
Depreciation and amortization	34,925	33,807	31,086
General and administrative, including management fees to Vornado of $2,380 in each year	5,252	5,436	5,406
Total expenses	125,304	121,475	112,710
OPERATING INCOME	105,270	105,461	95,205
Interest and other income, net	6,716	3,305	5,949
Interest and debt expense	(31,474)	(22,241)	(24,239)
Income before income taxes	80,512	86,525	76,915
Income tax expense	(3)	(48)	(8)
Net income	$ 80,509	$ 86,477	$ 76,907
Net income per common share - basic and diluted (in dollars per share)	$ 15.74	$ 16.91	$ 15.04
Weighted average shares outstanding - basic and diluted (in shares)	5,115,501	5,114,084	5,112,352