This was the office of the McIntyre water department for many years. I’m not sure if it’s still in use.
Water Department, McIntyre
Vanishing Georgia: Photographs by Brian Brown
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Vanishing Georgia: Photographs by Brian Brown 
This building looks like it once was home to a store of some kind, possibly a larger (and later) grocery like Thompson’s, or a general merchandise store. Doesn’t look like it was once someone’s house.