N.Y.C. Admin. Code § 4-112: § 4-112 Deeds; execution of, by city.

Whenever the sale of any real property of the city shall have been authorized pursuant to this charter or other applicable law, the mayor or the commissioner of citywide administrative services and the city clerk, or for a sale of real property of the city that is under the jurisdiction of the department of housing preservation and development, the mayor or the commissioner of the department of housing preservation and development and the city clerk, shall execute proper conveyances of such real property signed by them and bearing the seal of the city. A conveyance of such real property shall not be delivered to the grantee until the proceeds of such sale have been received by the city.