> Building density housing is cheap compared to building the schools, parks, fire, police stations, and transportation to support the new density housing. And

> Building density housing is cheap compared to building the schools, parks, fire, police stations, and transportation to support the new density housing. And to close the circle, Prop 13 makes it impossible for towns in California to tax residents enough to pay for the required parks, schools etc. There is an obvious solution (repeal Prop 13, and bump local property taxes enough to cover the infrastructure the new residents will need) but it's politically infeasible.