This is a big one, and I'd add in an aggressive tax for owning multiple properties. Make single land ownership ~70% of what it currently is, and each additional property increases all your property tax by 300%. Couple that with getting rid of idiotic exemptions (seriously...I have a friend with parents that owned more than a hundred different properties in a semi-rural area [one that was going to become suburban soon] and paid nearly no taxes because they plunked a few cows onto each one until the development companies paid the big moolah for them) and there would be plenty of homes for everyone. Last report I remember said we had more than enough empty homes sitting around to house every homeless person multiple times over.