N.Y. State Law § 59-K
Whenever the United Nations is desirous of acquiring land by purchase for any of its purposes, the secretary-general of the United Nations, or other representative designated by him, may apply for any relief permitted by the laws of the state of New York that may be necessary for the purpose of acquiring such land, to any court of the state having jurisdiction within the county in which the land is located. All deeds, conveyances and other papers relating to the title of lands within the state acquired by the United Nations pursuant to the provisions of this article, or other general or special law, federal, state or local, shall be filed and recorded in the office of the register, if any, or if not in the office of the county clerk of the county where the land is located, and certified copies filed in the office of the secretary of state of the state of New York at Albany.
N.Y. State § 59-K