N.Y.C. Admin. Code § 11-330: § 11-330 Record of tax lien certificates.

The commissioner of finance, or his or her designee, shall keep in his or her office a public record of sales of tax liens, and a copy of each tax lien certificate issued by such commissioner or his or her designee. Assignments of tax lien certificates duly acknowledged may be filed and recorded in the office of the commissioner of finance or his or her designee. A tax lien certificate and any assignment thereof, duly acknowledged, shall be deemed conveyances under article eight of the real property law, and may be recorded in the office of the recording officer of any county in which the real property which it affects is situated. Tax lien certificates and all assignments thereof shall be recorded by recording officers in the same manner as mortgages and assignments thereof, but without payment of tax under article eleven of the tax law. Neither the tax lien nor the rights transferred or created by a tax lien certificate shall be impaired by failure of a recording officer to record a tax lien certificate made by the city through the commissioner of finance or his or her designee.