Well done! I'm getting there.
The era of this house, and given the size and layout, I suspect that it was meant that any staff lived in the attic.
If you look at the plans, you'll see that all the "public" rooms are accessed from the front foyer. The kitchen is only accessible through the owner's library which is separated by pocket doors. Right in the corner where the butler's pantry is, there's an l-shaped stairway going up to the second floor. The basement stairs would be under that (right across from the powder room).
I also have a 3rd set of stairs from the 2nd floor going up to the attic.
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I haven't yet put in a basement, but if I do, I'll place the stairs under the kitchen stairs.
My second floor is only just roughed out. I need to make a family bath (in those days there was usually only one bathroom) and I have to decide which room is the primary bedroom and give it an en-suite. I might make the room over the dining room into the primary suite and remove the roof over the dining room bay window and put a little balcony out there.
I think I'm going to have some lunch now and maybe work on my stitching this afternoon. Too many ideas running around in my head. I need to take a break.