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ORGANIZATION AND BACKGROUND	12 Months Ended
	Dec. 31, 2011
ORGANIZATION AND BACKGROUND
ORGANIZATION AND BACKGROUND	NOTE 1—ORGANIZATION AND BACKGROUND         One Liberty Properties, Inc. ("OLP") was incorporated in 1982 in Maryland. OLP is a self-administered and self-managed real estate investment trust ("REIT"). OLP acquires, owns and manages a geographically diversified portfolio of retail (including furniture and office supply stores), industrial, office, flex, health and fitness and other properties, a substantial portion of which are under long-term net leases. As of December 31, 2011, OLP owned 89 properties, one of which is owned by a consolidated joint venture and one of which is a 50% tenancy in common interest. OLP's unconsolidated joint ventures owned a total of five properties. The 94 properties are located in 29 states.

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- Definition

The entire disclosure for the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings).

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