There's exactly that example on the official OSM wiki page [1]. It's very useful to read their wiki while adding things to the map! OSM and all related project

There's exactly that example on the official OSM wiki page [1]. It's very useful to read their wiki while adding things to the map! OSM and all related projects thrive on users' contributions -- be the change you want to see in the world and start contributing today :) [1] https://wiki.openstreetmap.org/wiki/Key:building:levels https://wiki.openstreetmap.org/wiki/Key:building:levels