Modernize duplex floor plan

Hello dear house-building community,

we have purchased a building from 1952 and hope that some of you might have ideas on how we can redesign its floor plan into a more modern and open layout.

Basically, we are quite free in the design since only one wall (marked in yellow) is load-bearing and should either be partially retained or supported by steel beams. Otherwise, we are also willing to move both the staircase and the front door. Between the ground floor and the upper floor there is a wooden beam ceiling, and between the ground floor and the basement there is a concrete ceiling.

The entrance of the house is currently located in the courtyard, on the south side of the house (extension), the north side faces the street. On the west side is the other half of the semi-detached house and on the east side is our driveway (not wide enough to relocate the entrance there).

On the ground floor, we imagine a living/dining area with an open kitchen as well as a small study (home office), an entrance area, and a guest toilet.

Upstairs should be a family bathroom, a master bedroom, a walk-in closet, and two children's rooms.

Does anyone have ideas on how the desired rooms could be arranged with

1) unchanged house entrance & staircase or with
2) relocated staircase (possibly also another staircase design) & relocated front door?

We look forward to your feedback,
Best regards, Katharina

I would move the entrance to the street side. That way you have the area behind the house (South) as a purely private area.

Kitchen, hallway, bathroom, and parts of the front room create a large open space with garden access to the south
the rest towards the other semi-detached house will be entrance, WC, wardrobe
the room will become a study.
Stairs accessible either from the entrance/hallway or added to the open space.

Basically, we are quite free in the design, since it seems that only one wall (marked in yellow) is a load-bearing wall, which should at least be partially preserved or supported by steel beams.

A. I do not believe that, B. has

Between the ground floor and the upper floor there is a wooden beam ceiling, between the ground floor and the cellar a concrete ceiling.

a different opinion and C. would also first need a steel beam with sufficient supports. So I do not even see the wall removable that is already shown as removed in the ground floor plan. Does the floor plan of the other half provide any information about the original condition? – because I possibly already consider the bathrooms to be retrofitted and/or the year of construction to be a wrong assumption (respectively the entrance area already built on). 1952 is actually still too early for 24 cm walls, they would still have to be 25 cm. I consider all walls here to be load-bearing and bracing, except those of the small bathrooms in the entrance annex.

Guessing probably doesn't help much. Has a structural engineer already looked at it?