Cupertino is a unique case as you have extremely rich Chinese investors as well as apple HQ in that city. Also it is known to have the best schools in the bay area besides Palo Alto. But yeah totally crazy nonetheless.
Interestingly only 10% of Apple employees live in Cupertino. And we actually don't have many foreign investors, Chinese or otherwise, as most houses are owner-occupied. But you're right about the schools!