How to tag? Parking garage spanning multiple buildings, one of which is multi use

I am currently dealing with a situation of a multi-level parking garage that is part of a retail center and encompasses several buildings. One of the buildings is a standalone parking garage, while another is multi-use: Some levels of said building are a department store, while others are used as a parking garage.

I attempted to show the relation of the two buildings using a multipolygon, as shown here. Is this a good idea, or is there a better way to do it? Perhaps using Simple Indoor Tagging would help as well?

Here’s a link of the shopping center’s map for reference

Thank you!
TheAdventurer64

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/how-to-tag-parking-garage-spanning-multiple-buildings-one-of-which-is-multi-use/106402