Simple 3D buildings

They are ofcourse not M4TR as you use the building=yes tag and you add colours, height and roof shapes.

But for more complicated buildings?

What if there is an apartment building with different colours? Am i allowed to use building:part=yes for each colour? Or is that M4TR?

Monuments

Monuments can be a little sad to just se as a square or even a node, so could i map them in 3D? That sure is M4TR, but we want to map how it is in reality. So therefore it should be allowed? Right?