Unable to answer "How many levels above the basement does this building have?" – Nordsee Academy Schillig, Surfschule / Kitesurfschule (Retail Building) – https://osm.org/way/706742781 via StreetComplete 58.2:

Besteht aus alten Schiffscontainern.

Attached photo(s):
https://westnordost.de/p/236665.jpg