you don't. in a big city, nobody is really that concerned about each other's lives. they work jobs that don't have anything to do with you. you buy a coffee but you don't remember the face of the person who brewed it for you. most of the time you don't even know the people who live in the house beside yours.
as for how to fit them... you just don't leave any space unused. every part of the ground is real estate. and then you build up. put a dozen houses on top of each other.
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as for how to fit them... you just don't leave any space unused. every part of the ground is real estate. and then you build up. put a dozen houses on top of each other.