Who builds new homes if builders can't own them pre-sale? I imagine you have a carve out for that, but who qualifies as a builder?

What about people who want to live in cities? How do they come together to build say a small condo building? Do we only allow co-ops? How is that financed?

When you say "Americans", do you only mean citizens or permanent residents? Where do temporary residents live?

How do people move to new cities/states? Where will the new housing come from?