N.Y.C. Admin. Code § 28-204.6.9: § 28-204.6.9 Notice to mortgagees and lienors.

Notwithstanding the foregoing provisions, no such judgment shall be entered and enforced as a tax lien against any property unless at the time of the issuance of the notice of violation a copy of such notice was also served on all mortgagees and lienors of record of such property by mail addressed to the recorded addresses of such mortgagees and lienors.