Multi-level buildings - different uses

I have mapped a building which has two levels, a retail shop (currently disused) on level 0, and an unrelated commercial office on level 1. Can someone take a look to see if this is done correctly? It wasn’t clear to me from the wiki how to mark level 0 as retail use, and level 1 as commercial use.

Ways (all identical position):
373620912 - outline
373620916 - level 0 - retail shop, currently disused
32693839 - level 1 - commercial office

Relationship linking them:
5556312 - type building