I was trying to redesign my home before it sold to work. I was going to add a staircase like this one in the room where the kitchen was and add an upstairs with another kitchen and living room. I would use the downstairs as an family room.
This reminds me of one of my first remodels which was never implemented, (the couple got a divorce).
I had added a garage and a mastersuite and a court yard between the two. An access patio door was from the original dinning room.