Employees, which include over 9,000 in San Francisco, were previously allowed to work remotely until the end of 2020. Salesforce joins other tech giants like Facebook, Google and Uber, which all extended working from home until the end of June as the coronavirus pandemic rages on. The company occupies three towers in San Francisco’s Transbay district, including the city’s tallest building, Salesforce Tower. Downtown merchants worry that the prolonged absence of office workers will cripple the local economy, and many stores and restaurants in the area remain shut. Salesforce will offer an additional $250 for office supplies to each worker,...