OSMfiller
Unable to answer "How many levels above the basement does this building have?" for https://osm.org/way/51328154 via StreetComplete 36.0:

there is no #6. it's only 2, 4, 8.

also 2 & 4 are offset from the street, like the house on the opposing side

Attached photo(s):
https://westnordost.de/p/67024.jpg
https://westnordost.de/p/67025.jpg