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Those rectangular boxes on the sides of buildings are called scuppers, and are a hole through the parapet wall (the part that sticks up beyond the flat roof)with a sheet metal box connected to a downspout. Often they are closed at the top, so a little rectactangle of plastic with a bit of plastic rod leading down to represent the downspout would work. They're usually sized in increments of 8 inches, like the masonry walls through which they penetrate. Downspouts on larger buildings are at least 6 inches in diameter. Homes usually about 4 inches. Really large buildings can have internal drain systems to clear large areas of roof. The internal drains often follow the grid of columns used to support the building. Hope this helps. Eric
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