N.J. Stat. Ann. § 55:18-5

Every structure rehabilitated or converted by a lessee under authority of this act, and every dwelling unit in such structure, shall conform to all applicable codes relating to healthfulness, safety and structural soundness of comparable new construction in the municipality; except as the governing body may by ordinance grant modification of or exemption from applicable municipal codes or ordinances on reasonable grounds and without hazard to the health and safety of residents of the rehabilitated or converted structure.