I would hard cap how many houses anybody can own to something like 4 - whether through an LLC or otherwise. Many countries do not or did not allow foreign ownership of residential real estate. It's definitely not in the interest of any people to have their very land taken from them. In the current climate that would likely take an extremely nasty turn so it's not the best time for it, but I would be very supportive of such a measure with an exception for permanent residents and spouses of US citizens.