Answer: No atriums can be counted as rentable floor areas since they are not buildable areas, even for ground floors. The maximum rentable total floor area in the official rules is calculated as:
Max rentable floor area for floors 1-7: 12 x 12 – 6 x 6 = 108 in^2
Max rentable floor area for floors 8-10 and 16-19: 12 x 12 = 144 in^2
Max rentable floor area for floors 11-15: 5.5 x 5.5 = 30.25 in^2
Max rentable total floor area: 108 x 7 + 144 x 7 + 30.25 x 5 = 1915.25 in^2
Therefore, the maximum rentalable total floor area is set to be 1915 in^2.