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There are more extreme versions of these all over Seoul. Usually there's a 5-story mall with grocery store, clinics, super market, etc. Then on top of that there's a 30-story apartment building with some outdoor grass area. You basically don't have to leave the building if you live there.

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These might eventually turn out to be predecessors of future arcologies [1]. If you can work out the co-generation aspects, a hyper-dense version of these "malls" could yield significant energy savings over even conventional high-density megalopolises like NYC, Beijing, Tokyo, Mumbai, etc.

[1] https://boingboing.net/2015/04/16/arcology-cutaways-of-the-f...

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