HMart said:
Not enough supply. Too much demand. Housing costs too high.
My personal solution would be to:
deregulate zoning Houston-style (increase supply)
allow for 10x more density (increase supply)
open borders to all immigrant workers (reduce cost of building)
increase viability of commuting with bike/foot/carpool/bus/public transport (increase infrastructure's ability to deal with more supply)
reduce parking requirements (increase supply)
Some elements here of a libertarian free-market solution of removing regulations. But then Irvine would look very different. I'm trying to think of a pro-development YIMBY (opposite of NIMBY) city that is scaleable with density in California. Maybe LA or LB. Definitely not SF.
Reducing costs only increases profits in this scenario. Supply and Demand pretty much dictate prices here. Certain corporations are controlling some of that.
Creating new business friendly areas out in cheaper areas might help reduce demand here. Better mass transit options might also help make further options look more appealing.