Rooms. For the purpose of this section, a bedroom shall be construed to be any separate room other than a living room, dining room, kitchen or bathroom. Each apartment unit in each garden apartment building shall contain as a minimum a separate bedroom, a separate living room, a separate bath and a separate kitchen, which kitchen facility shall be located separate and apart from the other rooms in the apartment unit. In each garden apartment development, at least 85% of the dwelling units thereof shall be one bedroom units and not more than 15% thereof shall be two bedroom units. Only one and two bedroom units shall be permitted.