Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES
Property rentals	$ 43,330	$ 43,424	$ 87,159	$ 86,889
Expense reimbursements	20,272	18,612	40,103	38,019
Total revenues	63,602	62,036	127,262	124,908
EXPENSES
Operating (including fees to Vornado of $1,485, $1,217, $2,962, and $2,553, respectively)	21,199	19,951	42,461	41,138
Depreciation and amortization	8,667	8,577	17,364	16,811
General and administrative (including management fees to Vornado of $540 and $1,080 in each three and six-month period)	1,800	700	2,924	1,799
Total expenses	31,666	29,228	62,749	59,748
OPERATING INCOME	31,936	32,808	64,513	65,160
Interest and other income, net	44	1,715	78	1,820
Interest and debt expense	(12,751)	(14,319)	(25,819)	(29,124)
Income before income taxes	19,229	20,204	38,772	37,856
Income tax benefit (expense)	9	(9)	(110)	151
Net income	19,238	20,195	38,662	38,007
Net (income) loss attributable to the noncontrolling interest	(346)	(38)	(288)	357
Net income attributable to Alexander's	$ 18,892	$ 20,157	$ 38,374	$ 38,364
Net income per common share - basic
Net income per common share - basic (in dollars per share)	$ 3.70	$ 3.95	$ 7.51	$ 7.51
Weighted average shares outstanding - basic (in shares)	5,107,415	5,106,351	5,107,199	5,106,144
Net income per common share - diluted
Net income per common share - diluted (in dollars per share)	$ 3.70	$ 3.95	$ 7.51	$ 7.51
Weighted average shares outstanding - diluted (in shares)	5,107,415	5,106,351	5,107,199	5,106,144
Dividends per common share	$ 3.75	$ 3.00	$ 7.50	$ 6.00