Rooms. Any room other than a living room, dining room, bathroom, laundry room, utility room, foyer or hallway shall be construed as a bedroom, and every unit constructed shall be presumed to have at least one bedroom. The number of bedrooms per dwelling unit is unrestricted; provided, however, that the total number of units having more than two bedrooms shall not exceed the total number of units having two or fewer bedrooms, and there shall be no more than 13 bedrooms per gross acre. Under no circumstances shall the bedroom mix result in a gross density that exceeds 10 dwelling units per acre.