I disagree with your "natural" person qualification. "Non-natural persons" includes anyone with a work visa or green card. It's hard enough for most people to get these, much less become fully naturalized citizens. Plus, the waiting time isn't guaranteed in length: it's variable based on the political climate. It's hard enough for immigrants today. Making the viability of home ownership based on political whims only worsens it. Shouldn't we prefer these immigrants become homeowners, increasing their "investment" in their local communities?