House planning for 3 generations

With a knee wall height of 1.80, you are quite clearly dealing with a two-story building in this floor plan.

Thanks to the large ground floor, probably not.

I will be at the architect's for half a day again tomorrow. Then I will have a measured printout made.

The fact that the architect writes numbers on it won't make it any better. This is a custom design in the sense of "not for sale," and that's why I don't see the banker writing any numbers on it ;-(
The first thirty posts have come together here without me at all, although I check in daily. That also means: I see nothing here worth saving.