Hey, there is this hotel with 2 levels and the entrance is at the groundfloor with a part of the building sticking out of the first floor right above that. Not sure if I explain it well so I will attach a photo just in case. How do I deal with the foot path that OSM detects as a conflict?
Alternatively, you can create a type=building-relation that includes the building and all its building:parts, and have the actual building=yes outlines exclude the part that sticks out. This building-part can then have layer=1, the building=* itself won’t need it. It sounds more complicated than it actually is.
Producing clean building part mapping isn’t that easy. There are a lot of subtle mistakes you can make. It’s also unnecessary unless you want to do actual 3d mapping with min_height and such.