N.Y.C. Admin. Code § 28-215.1.1: § 28-215.1.1 Lien for emergency work.

The expenses of the city in performing emergency work on any structure or part of such structure pursuant to this article shall constitute a debt recoverable from the owner and a lien upon the land and any part of such structure that was not demolished. Every such lien shall have priority over all other liens and encumbrances on the premises except for the lien of taxes and assessments. Except as otherwise provided by rule of the affected agency, the agency incurring such expense shall be governed by the procedures set forth in article 8 of subchapter 5 of the New York city housing maintenance code with respect to the enforcement of such debt and lien against all types of structures, including those authorized to be occupied or otherwise occupied for residential, commercial, and manufacturing purposes.