Lawsuits from the Chicago Tribune and Better Government Association have forced Chicago Mayor Rahm Emanuel to release thousands of pages of email correspondence from a private account, and the documents are providing an unusual glimpse at how influential Silicon Valley figures get work done. At the time, Airbnb was facing the possibility of new regulatory scrutiny in the city, and was concerned about the possible effects on its business. According to an email chain, Airbnb turned to Valley investor Marc Andreessen, whose firm, Andreessen Horowitz, has invested in the company.