What is driving the real estate up is those foreigners buying up all those million dollar mansions. It's ridiculous that somebody who has a six-figure income can't even buy a house. What you need to do is levy a foreign buyer's tax on real estate in the entire state of California so that way any foreigners are deterred in buying up real estate.
In our Canadian city of Vancouver, we had the same problem. There were couples who were BOTH doctors making six-figure income and couldn't even afford to rent and had to live with the husband's parents and meanwhile there were empty houses everywhere in the neighbourhood that were owned but never lived in. The provincial government just had it and levied a 15% foreigner buyer's tax on real estate. Any buyers who are not citizens of Canada and who have not lived in Canada for 5 years for full time have to pay 15% tax when buying a real estate. It worked like a charm!! The market cooled down instantly. Real estate sales dropped by 30%!! For us Canada, 15% did the trick. For California, you guys might need to levy like 25% to see any effect.
The only thing is the foreign buying will just migrate elsewhere. Now we are seeing the same problem in other metropolitan cities in other provinces and those provinces are contemplating levying the same tax as well. And that is good, if you can have all the wealthy states to levy the taxes together then eventually all the foreigners will be pushed to buy up properties in less popular cities in America and that way spread a bit of real estate boom balanced throughout United States and people will at least be able to own a piece of land. Once everybody's owned a piece of land then you just drop the foreign buyer's tax and then when the foreigners come back, you just sell the real estate back to them and make a nice capital gain!