Pedestrian area on top of a building

What is the best way to tag a pedestrian area that is on top of a building? I noticed an example Note: 3471802 | OpenStreetMap

Looking at the Mapillary and Bing aerial imagery you can see that it is on top of a building, which also is also part of the art museum. Is it simply a case of adding the pedestrian area as a layer on top of the building?

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