15' x 30' = 450 square feet.
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1120 square feet
30 × 40 = 1200 square feet
The building has 4.5 milliongross square feet (418,064 gross square meters) of floor space
3,500 square feet (50 x 70 = 3,500).
You multiply the two numbers to get the area. This would give you 1,125 square feet.