Repairs, renovation, and modernization of nonconforming buildings and structures. Repairs, renovation, and modernization of nonconforming buildings or structures such as renewal or replacement of outer surfaces or windows, or addition of soundproofing or fireproofing materials, air conditioning, and repair or replacement of structural parts or members of the building or structure, shall be permitted notwithstanding other provisions of this Zoning Ordinance. Such repairs, renovations or modernization shall not change or alter substantially the physical configuration of the nonconforming building or structure or change its position on the ground, provided that no increase in the size of or area covered by the said nonconforming building or structure, nor any extension or expansion of the nonconforming use or area of such use within the building or structure in or on the lot where such nonconforming use is located shall be permitted or authorized by this section. Areas of nonconforming use within a building or structure may be rearranged in connection with such repairs, renovation or modernization if there is not an enlargement or expansion of the nonconforming use within said building or structure.