> Where are they supposed to live? If zoning allows for building more densely (which in the US, it often does not) existing residents can trade their single-fa

> Where are they supposed to live? If zoning allows for building more densely (which in the US, it often does not) existing residents can trade their single-family homes for a condo in the same location + some cash. It comes down to a zoning issue in the end, not some special problem with economically developing an area.