Off-street parking in commercial, industrial and manufacturing districts, when located in the front yard, shall not be closer than 35 feet to the edge of the travelled roadway. Except for the entrance or exit, the area between the edge of the berm and the beginning of the parking area shall be planted and maintained with grass; provided, however, that any grassy area shall be not less than 15 feet in width. There shall be at least one entrance and one exit onto a public highway. Off-street parking spaces shall be provided in accordance with the specifications in this section whenever any new use is established or existing use is enlarged.