Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Real estate, at cost:
Land	$ 44,971	$ 44,971
Buildings and leasehold improvements	874,808	873,667
Development and construction in progress	89,244	75,289
Total	1,009,023	993,927
Accumulated depreciation and amortization	(216,265)	(210,025)
Real estate, net	792,758	783,902
Cash and cash equivalents	239,312	227,815
Short-term investments	24,998	24,998
Restricted cash	84,615	84,602
Marketable securities	45,139	44,646
Tenant and other receivables, net of allowance for doubtful accounts of $1,359 and $1,544, respectively	3,425	2,213
Receivable arising from the straight-lining of rents	180,490	179,939
Deferred lease and other property costs, net, including unamortized leasing fees to Vornado of $33,483 and $33,974, respectively	45,822	46,561
Deferred debt issuance costs, net of accumulated amortization of $11,895 and $11,295, respectively	4,150	4,824
Other assets	12,163	23,716
Total assets	1,432,872	1,423,216
Liabilities and Equity
Mortgages payable	1,032,004	1,032,780
Amounts due to Vornado	4,658	3,922
Accounts payable and accrued expenses	44,411	35,127
Other liabilities	2,981	2,988
Total liabilities	1,084,054	1,074,817
Commitments and contingencies
Preferred stock: $1.00 par value per share; authorized, 3,000,000 shares; issued and outstanding, none	0	0
Common stock: $1.00 par value per share; authorized, 10,000,000 shares; issued, 5,173,450 shares; outstanding, 5,106,196 shares	5,173	5,173
Additional capital	30,139	30,139
Retained earnings	298,936	299,004
Accumulated other comprehensive income	14,944	14,457
Equity before treasury stock	349,192	348,773
Treasury stock: 67,254 shares, at cost	(374)	(374)
Total equity	348,818	348,399
Total liabilities and equity	$ 1,432,872	$ 1,423,216