One nameplate sign not exceeding one square foot in area identifying a professional office conducted in the building on which the sign is displayed; any illumination thereof shall be indirect and nonintermittent.

One sign not exceeding 15 square feet in surface display area shall be permitted for a church, school, hospital or governmental agency, either attached to the wall of the building, or, if a ground sign, set back a minimum of 20 feet from the street line. Such signs may be illuminated by direct lighting, provided it is so screened that light is not directed or reflected toward any adjacent residence.

Nothing in these provisions shall prohibit residential nameplates, symbols or window stickers from use on a residential property or structure.