Rentals make up a small percentage of single family homes. Around 5% depending on where you are. Not letting black rock buy a home won't save you from the overpaid tech worker or nurse-account power couple from dropping 1.5x the listing price in cash. We know flooding supply works because we've seen it play out. Tokyo is the biggest metro area in the world, with a growing population, and reasonable rents because the government took serious measures to increase supply. Restricting demand by banning corporate investors probably won't help, but even if they did it did the effects would be minor. Focus on the solutions we know will work.