Unable to answer "What’s the house number of this building?" for https://osm.org/relation/6281546 via StreetComplete 54.1:

This building is two separate buildings connected by walkway

Attached photo(s):
https://westnordost.de/p/181509.jpg
https://westnordost.de/p/181510.jpg
https://westnordost.de/p/181511.jpg
https://westnordost.de/p/181512.jpg