The Sky King Tower
This building, almost twice the height of most 20th Century skyscrapers, has a resident population of just over 50,000. It is estimated that this tower cost 10 billion to build and has an impressive floor area of 1,039,206m squared. The tower was was the dream challenging Freedom City's bursting of the real-estate bubble. The Tower is nearly fully self-sufficient and even process it's own waste.