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The United Nations General Assembly (UNGA/GA) is one of the six principal organs of the United Nations and the only one in which all member nations have equal representation. The headquarters of the United Nations is a distinctive complex in New York City, United States, that has served as the official headquarters of the United Nations since its completion in 1952. It is located in the Turtle Bay neighborhood of Manhattan, on spacious grounds overlooking the East River. Though it is in New York City, the land occupied by the United Nations Headquarters is considered international territory, and its borders are First Avenue on the west, East 42nd Street to the south, East 48th Street on the north and the East River to the east. The United Nations Headquarters complex was constructed in New York City in 1949 and 1950 beside the East River, on 17 acres (69,000 m2) of land purchased from the foremost New York real estate developer of the time, William Zeckendorf. Nelson Rockefeller arranged this purchase, after an initial offer to locate it on the Rockefeller family estate of Kykuit was rejected as being too isolated from Manhattan. The $8.5 million purchase was then funded by his father, John D. Rockefeller, Jr., who donated it to the City. The lead architect for the building was the real estate firm of Wallace Harrison, the personal architectural adviser for the family.