Prop 13 reduces city income from residents, so cities prefer to zone for offices instead. When Mountain View has offices that provide jobs from 10x people, but

Prop 13 reduces city income from residents, so cities prefer to zone for offices instead. When Mountain View has offices that provide jobs from 10x people, but housing for only x, that means the richest x will get the housing (pushing up prices) while the other 9x have to commute in from far away. Result: expensive housing and bad traffic. Prop 13 is a classic case of "road to hell paved with good intentions".