I think that in CA the biggest factor you can point at is Prop 13. Current residential landowners are getting the benefits of rising values without the costs of

I think that in CA the biggest factor you can point at is Prop 13. Current residential landowners are getting the benefits of rising values without the costs of higher taxes. NIMBY or otherwise, the incentives are pretty clear when framed this way. And I think the costs trickle down to things like lot-rental prices for mobile home parks rise just like rents do.