This underlines a problem with California. Even after the crash, large swaths of the state (not just Malibu) have expensive houses.
Let us think about what a middle-class household can afford. The median income for a family of four in California is about $70,000. Once upon a time (i.e., before around 2002), the "front-end" ratio for a mortgage borrower was supposed to be no more than 28 percent of gross income. The front-end ratio is the ratio of principal, interest, property taxes and insurance to gross income. If one assumes that a borrower can get a 30-year mortgage at a 3.75% rate, pays 1.1% of property value in property taxes, and an insurance premium of 0.2% per year, AND assumes that the borrower has a 20 percent down payment, a household earning $70,000 per year can afford a $250,000 house. So the value of a "middle-class" house is $250K. This is a long way from $525,000.