With the exception of single-family dwellings, no charcoal burners shall be kindled or maintained on combustible balconies or within 10 feet of combustible patios on ground floors.  Gas grills that use cylinders having water capacities greater than 2 1/2 pound LP-Gas capacity shall not be located on balconies above the first floor that are attached to a multiple family dwelling of three or more living units located one above the other.