I've seen a similar issue with a shop in our area https://www.openstreetmap.org/way/351561908#map=19/-28.08993/153.45070
The street address is 15 Park Avenue, but the only thing there is the car park, with staff entry, goods lift & customer stairs & lift, but that should (?) be level=0 as that is it's street address. The actual shop, & main entry door, is downstairs at the level of James Street, but is it level=0 James Street, or level=-1 Park Avenue? Thanks Graeme
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