Seeking to prevent San Francisco’s return-to-work program from reigniting a surge of COVID-19 cases, the city’s Board of Supervisors (“Board”) has passed the “Healthy Buildings Ordinance” (“Ordinance”). This temporary emergency measure, which Mayor London Breed signed on July 17, 2020, and which is effective immediately, (i) establishes cleaning and disease prevention standards in tourist hotels and large commercial office buildings; (ii) mandates employee training on these standards and various protections employers must provide for…