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20 feet
Each story is about 10 feet, so 400 feet is about 40 stories.
3-4 stories
5 stories as the height of a story in a non-residential building is 11 feet. Therefore, if there are 55 feet, there are 55 feet divided by 11 feet for a total of 5 stories.
20 x 20 = 400 square feet.