Two San Francisco tech giants headquartered about a block away from each other are joining forces. Cloud software pioneer Salesforce.com is buying work-chatting service Slack for $27.7 billion in the biggest acquisition of Salesforce's 21-year history.
March Benioff said he will pay all of its hourly service providers and interns if they need to stay home sick.
Christien Kafton reports from San Francisco
The story of the San Francisco skyline is turning a new page. Unchanged for decades there is a new look, a new building on the block -- the Salesforce Tower.