Mind Booster Noori
Unable to answer "What is the house number of this building?" for https://osm.org/way/894651809 via StreetComplete 38.1:

Neither the residential door or the street level commerce doors have any indication of a street number. The license of one of the businesses has the address with business name, street name and city name, but no street number.

Attached photo(s):
https://westnordost.de/p/72013.jpg