N.Y.C. Admin. Code § 11-402: § 11-402 Applicability of procedure of foreclosure in rem.

a. The provisions of this chapter shall be applicable only to tax liens owned by the city.

b. The provisions of this chapter shall not affect any existing remedy or procedure for the enforcement or foreclosure of tax liens provided for in this code or any other law, but the remedy provided herein for foreclosure by action in rem shall be in addition to any other remedies or procedures provided by any general, special or local law.

c. The provisions of this chapter shall not affect pending actions or proceedings, provided, however, that any pending action or proceeding for the enforcement or foreclosure of tax liens may be discontinued, and a new action may be instituted pursuant to the provisions of this chapter, in respect to any such tax lien.