N.Y.C. Admin. Code § 27-2152

correction. The department may, upon good cause shown, including consideration of the complexity of repairs which may be necessary to make the dwelling unit habitable, grant such extension for such period of time that it deems appropriate

N.Y.C. Admin. Code § 27-2135

also, in addition to ordinary repairs, maintenance and replacement, make other improvements to effect a rehabilitation of the property, in such fashion as is consistent with maintaining safe and habitable conditions over the remaining useful life of the dwelling

N.Y.C. Admin. Code § 27-2002

hereby found that the enforcement of minimum standards of health and safety, fire protection, light and ventilation, cleanliness, repair and maintenance, and occupancy in dwellings is necessary to protect the people of the city against the consequences of urban blight