Unable to answer "What’s the house number of this building?" for https://osm.org/way/267606131 via StreetComplete 45.2:

I asked at one of the two stores and they didn't know, and showed that on Google Maps it's 9/11. That seems unusual as it usually means "unit 9, lot 11"; 9-11 ("spans lots 9 and 11") would make more sense.