Corporate security guards have started to make a discreet appearance as the protests escalate. The core grievance is one keenly felt by almost everyone in San Francisco: the way the tech sector has pushed up housing prices in the city and made it all but unaffordable for anyone without a six-figure salary. Almost no San Francisco police officers live in the city any more, and neither do most restaurant workers or healthcare workers. The funky, family-owned shops that once defined the city are closing because owners cannot afford the business rent, never mind the rent on their housing.