1. Everyone is forced to sell their lakehouses, cabins, ADUs? Detached mother-in-laws? (wtf is "Exactly one house?")
No one is ever able to rent a single family home ever again? Right now 14.5 million households / 44 million residents rent single-family homes in the United States. They're... out of luck? On the street? Gotta save for a down payment? If those houses are force-sold, don't you think people-other-than-the-current-inhabitants will come in and buy them?
Actually, can anyone ever rent ever again? Or is it a buy-vs-homeless dichotomy here? Or do towns have to become miniature companies and play landlord? Or states?
2. Timber companies are forced to give up their land, bankrupting all of them and driving the cost of wood sky high. Mobile home land must now be sold, except no one can buy it. Farms except for sole proprietors are forced to give up their land (sorry partnerships, amish, people with discontiguous lots, and everyone who wants to eat this year, you're out of luck)
IMO you should focus on laws that let people build more (eg, ADUs, duplexing) rather than getting out the stick and hoping there won't be huge side effects.
For your first proposal, I wonder about folks buying a house through an LLC or trust as folks often do to protect their privacy. Are we banning that? I also wonder about inheritance - if I own a house and my parents die, leaving me their house, how long do I have to sell one to be "in compliance?". Maybe their house needs work and I'd like to spend a few months or a year fixing it up to maximize what it'll sell for. Is that ok? And speaking of timing - I remember during the wave of foreclosures after the last housing bubble, banks kept a lot of houses off the market for a while to moderate prices, rather than listing everything at once and panicking the market further. Seems like banks ought to have some leeway to maximize their return (e.g. if a house has a pool and is foreclosed on in the late fall, maybe they judge that waiting until spring would get a better response from buyers).
okay, but what if I have (an opportunity for) positive cashflow, minimal savings, and want to move away from my parents' house? does it just suck to be me or what?
2. Can corporations still own commercial property? And can foreigners own corporations ?
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?
2. Only actual Americans can own property in America. Single-fam, multi-fam, land,etc. doesn't matter.
Exactly no one needs to rent houses if mulit-fam exists and actual houses aren't speculative instruments or places where foreign nationals hide their money.