Unable to answer "What kind of building is this?" for https://osm.org/way/266610890 via StreetComplete 51.1:

Waldhütte "Isletenhütte" mit Grillplatz, Abfall. Wie definieren?

Attached photo(s):
https://westnordost.de/p/138134.jpg
https://westnordost.de/p/138135.jpg