Unable to answer "This shop has been vacant. What’s here now?" – Universität Greifswald (University Building) – https://osm.org/way/434780299 via StreetComplete 63.0:

Philosophische Fakultät der Universität Greifswald
Institut für Erziehungswissenschaften

Attached photo(s):
https://streetcomplete.app/p/339841.jpg