CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Real estate investments, at cost
Land	$ 132,378	$ 126,697
Buildings and improvements	337,149	319,203
Total real estate investments, at cost	469,527	445,900
Less accumulated depreciation	60,566	54,137
Real estate investments, net	408,961	391,763
Property held for sale (including related assets of $808)		10,678
Investment in unconsolidated joint ventures	5,139	4,777
Cash and cash equivalents	8,430	7,732
Available-for-sale securities	353	422
Unbilled rent receivable	12,151	11,149
Unamortized intangible lease assets	11,571	10,887
Escrow, deposits and other assets and receivables	2,601	4,684
Investment in BRT Realty Trust at market (related party)	231	266
Unamortized deferred financing costs	2,465	2,265
Total assets	451,902	444,623
Liabilities:
Mortgages payable	197,796	215,308
Line of credit	20,000	36,200
Dividends payable	4,783	3,806
Accrued expenses and other liabilities	5,373	5,144
Unamortized intangible lease liabilities	5,274	4,982
Total liabilities	233,226	265,440
Commitments and contingencies
Stockholders' equity:
Preferred stock, $1 par value; 12,500 shares authorized; none issued
Common stock, $1 par value; 25,000 shares authorized; 14,146 and 11,212 shares issued and outstanding	14,146	11,212
Paid-in capital	188,370	147,158
Accumulated other comprehensive loss	(1,165)	(156)
Accumulated undistributed net income	17,325	20,969
Total stockholders' equity	218,676	179,183
Total liabilities and stockholders' equity	$ 451,902	$ 444,623

This element represents the designation of funds that are furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. It also includes prepaid expenses and tenant improvement allowance. It further includes carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy and other assets.

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Namespace Prefix:	olp
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant