N.Y. Gen. Mun. Law § 211

§ 211. Certified copy of transfer to be filed. Whenever the United\nStates, by any agent authorized under the hand and seal of any head of\nan executive department of the government of the United States, shall\ncause to be filed in the office of the secretary of state of this state,\nmaps and descriptions by metes and bounds of any such pieces of land\nwhich had been acquired by the United States for the purposes specified\nin section two hundred and ten of this article, exclusive jurisdiction,\nexcept as provided in section two hundred and twelve, is thereupon ceded\nto the United States over the lands so described, during the time that\nthe United States shall be or remain the owner thereof. Such maps shall\nbe drawn with pen and India ink upon tracing cloth and shall be\notherwise in form and manner suitable to the files, records and purposes\nof the office of the secretary of state, and show such data thereon, or\nin relation thereto, as may be required by the secretary of state.\n