Nothing in this article shall be construed so as to prevent the strengthening or restoration to a safe and lawful condition of any part of a building declared to be unsafe or unlawful by the Construction Official, Chief of the Fire Department or other duly authorized Township official. Such repairs and maintenance work which are required to keep it in sound condition may be made to a nonconforming building or structure, provided that no structural alterations shall be made except such as are required by law. All structural and major alterations shall be in accordance with the requirements of the Building Code of the Township,
and the area, bulk and other requirements of Part
2 of this chapter, or any amendment or supplement thereto, specifically referring to the zone location of the nonconforming premises.