What confuses me:
The space requirement on the upper floor is extremely high. Also, the fact that now, in addition to bedrooms (number of people) plus a children's bathroom, one room each has to be used for a home office could be discussed—where or how living is supposed to work at all. In large cities, building single-family homes is prohibited, while others really inflate things. Blah blah, I’m digressing…
I don’t see any inflation here in the room sizes in general. Everything looks quite normal. Everywhere 1-2 sqm more than in a 160 sqm house…
But rooms would have to move into an additional stepped floor. Despite flooding, the technical equipment is relocated to a basement so that the tower somehow doesn’t look like Lego from a drone’s view alone (oops, all the recesses in the ground floor facade are not reflected on the upper floor)... if you look at the building in section, you almost see a spinning top or a taller UFO. That should make you think (if you get paid for thinking according to ;))
The ground floor could contain technical equipment AND a stylish home office AND be generous if you manage the sqm better and do without these recesses. At least less would be more there.
With architectural planning, you can even fit a sauna on the upper floor.
I don’t see 4000/sqm if you straighten the corners. But you can certainly add the 20% to the proposed 7 that you’re used to from architectural calculations.