@alberto (or any other number cruncher with a calling 
) can you please have a look at the simulation that I made, and see whether it is correct?
It is saved in Team Building > Scouting exercise > Buildable area estimation (internal link). I also left a copy of the architects’ estimation in that folder, so that whoever wants to can play around with it without risking much.
If it is correct, then as a next step let’s create a separate post about this, and after that check in with the architects.
To be clear: this is only about the surfaces and does not include implications on costs (even though that could be built in if needed).