Uses prohibited in the residence districts (R-1, R-2, R-3, R-4, R/B-1 and R/B-2 Zones). No rooftop shall be used for dwelling purposes or for purposes accessory to a dwelling (such as, but not limited to, a sundeck, a dining facility or any other similar purpose). No rooftop structure shall be used for a greenhouse, as part of the living area of a dwelling unit, or for any other similar purpose.