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I'm a bit mixed on it, as there's a lot of old buildings that have sort of merged over time into one big blob.
I ended up going for individual buildings so it was easier to tag heights/roof shapes/etc; but the internal corridors as continuous ways for routing.
This sheds a bit more light on what it looks like from above (https://www.google.com.au/maps/search/city+cross+arcade/@-34.9252151,138.6008367,194a,20y,41.7t/data=!3m1!1e3)