Any storey having its finished floor surface entirely above grade, except that a storey shall be considered as a storey above grade where the finished floor surface of the storey immediately above is more that 6 ft (1829 mm ) above the grade plane, more than 6 ft (1829 mm) above the finished ground level for more than 40 percent of the total structure perimeter, or more than 12 ft (3658 mm ) above the finished ground level at any point.