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Old 05-15-2014, 08:41 PM
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kunilou kunilou is offline
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Join Date: Apr 1999
Posts: 24,248
It's not just Chicago; there are 2-flats (and 3- and 4-flats) in St. Louis.

I don't know if there's an "official" difference, but here in the Lou, a flat is commonly used to mean residences in a multi-story building with separate street entrances, while apartments are in multi-story buildings with entrances to a hall or stairway that leads to a common street entrance.

Of course if the building is a single story with multiple entrances, that's a duplex (triplex, fourplex, etc.)