This side street has a sign saying 'Somercour'. I asses this is the name of the side street (and not the building).

via StreetComplete 51.1

Attached photo(s):
https://westnordost.de/p/137940.jpg
https://westnordost.de/p/137941.jpg
https://westnordost.de/p/137942.jpg
https://westnordost.de/p/137943.jpg