Unable to answer "Who is allowed to park here? Parking may be free or paid." – Parking Lot – https://osm.org/way/30532712 via StreetComplete 57.3:

Sparkasse Parkplatz 
Kostenpflichtig mo-fr 9-18 Uhr
30min kostenlos 
Danach je 30min 0,50€
Verlorene Parkkarte 15€

Attached photo(s):
https://westnordost.de/p/211660.jpg