San Francisco has a dearth of new restaurant concepts because of the insane real estate market -- new restaurants stick to tried-and-true formulae (artisanal coffee, artisanal toast, $10 ravioli) because they&#x27;ll go bankrupt otherwise.<p>Local regulations also prevent foreign multinational chains from opening restaurants here, just as they prevent domestic multinationals like Wal-mart. (Din Tai Fung chose to open their new location in San Jose instead of SF.)