Unable to answer "What kind of building is this?" for https://osm.org/way/775108761 via StreetComplete 31.3:

Gemeinschaftshaus der Siedlungsgemeinschaft Eiserbach (Veranstaltungshaus)

Attached photo(s):
https://westnordost.de/p/40150.jpg
https://westnordost.de/p/40151.jpg