[dingensundso]

> How does stuff like that happen?

Simple: nobody entered the height of your condo building into OSM yet. You can change that. Be the change you want to see in the world!

[guappa]

My home has 2 floor if you enter from one side and 4 from the other side. Due to being on a hill. I wonder how to convince osm of that :D

[reddalo]

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

[3OCSzk]

You can tag it accordingly with this guide https://wiki.openstreetmap.org/wiki/Key:building:levels

Happy mapping!