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5 over 1, 7 over 2? What does that mean?
Floors of housing over floors of commercial.
So like, the bottom floor is a grocery store. Floors 2 through 5 is housing.
https://en.wikipedia.org/wiki/5-over-1
Five wooden floors over one masonry, concrete, or steel floor. They are the cheapest easy to build apartment houses currently in North America.