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This would depend upon how many floors the building has, and what shape/size each floor is :D
To answer your question honestly, though, the area of a rectangle is length * width. As your question already hints, the answer is to simply multiply the two numbers together!
21ft * 30ft = 630 square feet
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Earn +20 ptsQ: How many square feet is a 21 ft x 30 ft building?
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Continue Learning about Math & Arithmetic
How many square feet are in 21 x 19 room?
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14.4375 square feet.
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How many square feet are in 21 yards?
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