Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES
Property rentals	$ 136,628	$ 135,908	$ 134,847
Expense reimbursements	64,186	60,551	56,465
Total revenues	200,814	196,459	191,312
EXPENSES
Operating, including fees to Vornado of $4,516, $4,196, and $4,318, respectively	69,897	64,930	61,755
Depreciation and amortization	29,196	28,987	28,815
General and administrative, including management fees to Vornado of $2,380, $2,380 and $2,160, respectively	5,032	5,026	5,162
Total expenses	104,125	98,943	95,732
OPERATING INCOME	96,689	97,516	95,580
Interest and other income, net	2,434	1,527	177
Interest and debt expense	(32,068)	(44,540)	(45,652)
Income before income taxes	67,055	54,503	50,105
Income tax benefit (expense)	341	160	(64)
Income from continuing operations	67,396	54,663	50,041
Income from discontinued operations, including a $599,628 net gain on sale of real estate in 2012	529	2,252	624,952
Net income	67,925	56,915	674,993
Net income attributable to the noncontrolling interest	0	0	(606)
Net income attributable to Alexander's	$ 67,925	$ 56,915	$ 674,387
Income per common share- basic and diluted:
Income from continuing operations (in dollars per share)	$ 13.19	$ 10.70	$ 9.80
Income from discontinued operations, net (in dollars per share)	$ 0.10	$ 0.44	$ 122.24
Net income per common share- basic and diluted (in dollars per share)	$ 13.29	$ 11.14	$ 132.04
Weighted average shares outstanding (in shares)	5,110,628	5,109,055	5,107,610