Favelas tin-roof shanties would be cheaper too.
In the US, why not distribute value, transportation, and land sufficiently so people can have a better basic standard of living? Right now, I'm looking at 1000 homeless people and tents huddling under a highway, while my drunken idiot neighbors shout and dance with glee feet from them in a gentrifying, mixed-use development pool. The people who have just enough have no shame or consideration because their motto is "F U, I got mine."