United Nations Headquarters, New York, New York, USA The United Nations Headquarters complex in New York, overlooking the East River, has been the official headquarters of the United Nations (UN) since its completion in 1952. The principal organs of the UN have their seats there, including the General Assembly and Security Council. While located in New York City, the complex is technically extraterritorial and is under the sole administration of the UN. United Nations Headquarters is notable…