The gods dwell in the details.
Some high dollar areas request 1000 sq ft/ person, yet I know of a couple who pay top dollar for less then 200 sq ft in NYC no tub, no shower!!! (They use a portable folding shower gismo).
With most building codes you end up with a cookie cutter landscape. Low income housing equals mini ghettos. There needs to be a way to mix smaller homes with the McMansions, this can only be driven by market forces, if by fiat it will fail. The marketplace requires labor of many values, if you have to import labor the cost go up.
I do not believe that perceived social differences mix well? Any ideas?
My smallest bed room is bigger that that.
How does anyone live in 200 sq ft? It sounds like a jail cell.