This is a 3d model of a house with a terrace, and 2 balconies (floor 2 and floor 3). With internal walls and accurate sizes. Interior design(real life one) is made separately, as a 2d drawing

REMEMBER I am not an architect, and this is made in Fusion 360, the program not intended for this kind of tasks by any mean at all! I publish it for you to look at and see how not to do.

I also made a drawing of real life interior of this huge house in AutoCad (its not mine lol, but I have good memory).