Questions & Answers about W magazynie na parterze stoją pudła z papierem do drukarki.
Because both follow prepositions that describe a location, and in Polish that usually means the locative case.
- w magazynie = in the warehouse
- na parterze = on the ground floor
The basic forms are:
- magazyn
- parter
After w and na when they mean where? rather than to where?, Polish uses the locative:
- magazyn → w magazynie
- parter → na parterze
So this is normal case grammar, not a special irregular sentence pattern.
Because Polish normally uses na with floors of a building:
- na parterze = on the ground floor
- na pierwszym piętrze = on the first floor
- na drugim piętrze = on the second floor
This is just the standard idiomatic choice in Polish. English speakers often expect w because English says in the building, but with floors Polish typically says na.