Serious question: how do people get fire insurance for those houses? Or do they not, and all of those houses are bought and sold for cash and never insured?
Lack of insurance, or rather, uninsurability, tends to reduce mortgage availability. Banks don't like smokey assets.
https://www.forbes.com/advisor/homeowners-insurance/californ...
https://www.nytimes.com/2020/09/16/climate/california-home-i...