SF Shuts Down City Hall After Screener Tests Positive for COVID-19

San Francisco’s historic City Hall was all but shuttered Wednesday, the latest victim of the COVID-19 epidemic. Until Tuesday night, the building had still been open for limited city business despite last week’s stay-at-home order, with official meetings being held electronically. But that changed Tuesday night, after a sheriff’s cadet —  assigned to perform security screening at one of the…