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Organization and Operation	12 Months Ended
Organization and Operation	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operation	Organization and Operation Realty Income Corporation (“Realty Income,” the “Company,” “we,” “our” or “us”) is organized as a Maryland corporation. We invest in commercial real estate and have elected to be taxed as a real estate investment trust, or REIT. At December 31, 2018, we owned 5,797 properties, located in 49 states and Puerto Rico, containing over 93.3 million leasable square feet. Information with respect to number of properties, square feet, average initial lease term and weighted average contractual lease rate is unaudited.