If you look at many of those houses, you will find a bathroom in a room between 2 bedrooms. They were designed with a closet between the bedrooms and no bathroom. Outhouses were still the rule. Later, people converted the closets into bathrooms. I've seen quite a few that way, in fact I once owned one.
I owned one in Twin Falls, and the bathroom was indeed between the kitchen and a bedroom on the first floor, and in what was pretty obviously a converted closet upstairs.
The plumbing "conversion" in the basement to accommodate the upgrade would have made Medusa rage with jealousy.......
