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Flat property is usually harder to work with.
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I don't know, I was watching one of those shows like "building giants" the other night and they were pouring a 4' slab to top off a building overlooking Central Park - 1550' up. They said that once the concrete hits the pump truck it takes 20 minutes to get to the top. They did not mention what they drained the pipe into upon completion of the pour
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