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Sorry, but I came up with an idea, for another high building.
HMH (Highrise Multiple Houses) stacked upon one another, complete with their own Huge gardens, garages etc.(Passenger level: around 150, Mail level: around 50) *
SMH (Skyscraper Multiple Houses) stacked upon one another, complete with their own Huge gardens, garages etc. (Passenger level: around 550, Mail level: around 150) *
I'm sure, maybe, somewhere in the future it might be a usefull solution for the world overpopulation problem...

EDIT: * instead of having apartments, we could have a whole lands for houses on each levels and as above