My house was built in 1905 and had a staircase for servants that ran up that back portion of the house to the same landing that the main staircase connected to. I have no servants and because the staircases connect at the same point, I saw no point in keeping it and thus took on the renovation of the area. Here are the pictures of the progress so far and some blue prints.
What I started with
(butlers pantry under back stair)
The final plan
Demolition to the studs
Framing the new bathroom