To assure that structures in industrial districts shall be reasonably attractive in appearance, the builder or his representative shall submit to the Planning Board, in addition to other requirements, an architect's rendering or comparable illustration of the planned constructions, including landscaping, prior to applying for a building permit. Unless such a drawing approved by the Planning Board is submitted to the Inspector of Buildings, no permit for an industrial building shall be issued, nor shall an occupancy permit be granted unless and until the finished structure conforms in appearance to the drawing submitted.