N.Y.C. Charter § 2904: Section 2904. Duties and obligations of property owner with respect to sidewalk flags, fencing of vacant lots and filling of sunken lots or cutting down of raised lots.

The owner of any property at his own cost, shall

(1) install, reconstruct, repave and repair the sidewalk flags in front of or abutting such property, including but not limited to the intersection quadrant for corner property, and

(2) fence any vacant lot or lots comprising part or all of such property and fill any sunken lot or lots comprising part or all of such property or cut down any raised lot or lots comprising part or all of such property whenever the transportation department shall so order pursuant to standards and policies of the transportation department and section 19-152 of the administrative code of the city of New York. In the event that the owner fails to comply with the provisions of this section, the transportation department may provide for the doing of same at the expense of the owner in the manner to be provided by local law and section 19-152 of the administrative code of the city of New York.