United States. Congress

“ In case of any interruption or threatened interruption of any such services, the appropriate American authorities will consider the needs of the United Nations as being of equal importance with the similar needs of essential agencies of the Government of the United States, and will take steps accordingly, to ensure that the work of the United Nations is not prejudiced. ”

“ The President of the United States, or any official or governmental agency authorized by the President, may acquire in the name of the United States any property or interest therein by purchase, donation, or other means of transfer, or may cause proceedings to be instituted for the acquisition of the same by condemnation. ”

“ The United Nations shall, subject to the foregoing provisions of this section, have the exclusive right to authorize or prohibit entry of persons and property into the headquarters district and to prescribe the conditions under which persons may remain or reside there. ”