Roosevelt Island is a narrow island in the East River of New York City. It lies between the island of Manhattan to its west and the borough of Queens to its east. Running from Manhattan's East 46th to East 85th streets, it is about two miles long, with a maximum width of 800 feet and a total area of 147 acres. The island is part of the Borough of Manhattan and New York County. Roosevelt Island is owned by the city, but was leased to the state of New York's Urban Development Corporation for 99 years in 1969. Most of the residential buildings on Roosevelt Island are rental buildings. Though small, Roosevelt Island has a distinguished architectural history. It has several architecturally significant buildings, and has been the site of numerous important unbuilt architectural competitions and proposals.