Buildings in regions with a maximum height of 45 feet might be two-storey structures with each story 30 feet long, three-story structures with each level 45 feet long, or three-story structures with each floor 11 feet tall. Buildings in regions where the maximum height is 50 feet must be four stories high. The first two levels are used for parking, and the remaining two are rented out as apartments or offices. The total number of feet in a 30-foot room is 90. The number of feet in a 40-foot room is 180. A room with 70 feet of hallway will allow you to move from one end of the house to the other without walking into any walls. A 30-foot balcony has a perimeter of 60 feet, so it can contain a circular swimming pool that's 30 feet in diameter. You could also put six 10-by-20-foot rooms on the balcony if they had windows that opened. A 20-foot ceiling allows enough space for a house plan with a two-car garage and still have some money left over for popcorn. There are 12 inches in a foot, 3600 of them in a yard, and 144,000 of them in a mile. A mile is 5,280 feet or 1/10 of a mile.