This article throws around numbers like 15% for the Bay Area (not US), in 2014. Not sure about SF. http://www.sfgate.com/business/networth/article/How-and-why-

This article throws around numbers like 15% for the Bay Area (not US), in 2014. Not sure about SF. http://www.sfgate.com/business/networth/article/How-and-why-buyers-from-China-are-snatching-up-5924991.php http://www.sfgate.com/business/networth/article/How-and-why-...