Comment by ghaff

My house is early 1800s (old farmhouse). Yes, the bathroom is pretty much right above the kitchen/pantry presumably because that was the most straightforward way to pipe it. Not even sure what is original and what was probably installed/built around 1900 or so.

No real opportunity to put in another bathroom and I've talked with contractors. You could squeeze a really minimalist half bath in the pantry but then you lose the pantry and the washer/dryer need to go somewhere and the basement isn't really a good idea for various reasons.