The HEIGHT FACTOR of a BUILDING is equal to the total FLOOR AREA of the BUILDING divided by its LOT COVERAGE. If two or more BUILDINGS are located on the same ZONING LOT, their HEIGHT FACTOR is the sum of their FLOOR AREAS divided by the sum of their LOT COVERAGES. The HEIGHT FACTOR is thus equal to the number of STORIES, if the BUILDING were erected without setbacks. In computing a HEIGHT FACTOR, a fraction of .5 or more may be considered a whole number, and smaller fractions shall be disregarded.