Over 8x seems to be a CA thing mostly (one tile in Oregon bordering CA). Wonder if we can thank prop 13 for that? (Frozen property tax that constrains supply and encourages ani-development stance by removing the tax consequences of appreciating property)
I doubt you can lay all the blame on prop 13. It passed because CA home prices went crazy in the 70s. My parents bought a home in 1973 for $34k and sold it for $95k in 1978 (the year prop 13 was enacted). A 3x increase in 5 years.
Most of the blame? Probably.
The same that happened to your parents happened to landowners of huge properties. They still pay peanuts for property tax 40 years later. In the end - it helped people who got there first and then screwed everyone else over. It helped rent seekers more than anything.