Unable to answer "What kind of building is this?" for way/830360461 via StreetComplete 42.0:

This is a roofed staircase and ventilation shaft to access the underground parking lot.

Attached photo(s):
https://westnordost.de/p/98473.jpg

There is a barrier and access control here.

via StreetComplete 42.0

Unable to answer "Do you have to pay to use this restroom?" for node/1460581309 via StreetComplete 42.0:

Toilets and showers are the included in the entrance fee to the lagoon area.

Unable to answer "What kind of parking is this?" for node/469264262 via StreetComplete 42.0:

There is no parking place here currently. Parking is possible east of the building to the southeast.