@MortenCopenhagen and @Annaelisa :
Several months ago I noticed (at the desktop) for the shopping center Minto in Mönchengladbach, when zooming in closely enough, you may select a specific floor. Not sure, the exits were already marked at that time, but they are there now. However, I do not know, if navigation works inside that building to find the exit, if you got lost.
I did read - don’t remember where - all this must be specified by the owner of the building. If we, the local guides place a new business inside the center, we can specify the floor, if I remember correctly.