The idea that the parent poster mentions is indeed referred to as an arcology, the idea being that you have a small city completely encapsulated within a single

The idea that the parent poster mentions is indeed referred to as an arcology, the idea being that you have a small city completely encapsulated within a single monolithic structure. Remember those weird giant buildings from Sim City 2000? Those were arcologies. Other examples would be Peach Trees, the mega-skyscraper setting of Judge Dredd, and the Cairo arcology from Deus Ex 2