Joe Mansueto of Morningstar with Sundar Pinchai of Google and the Thompson Center in Chicago (Morningstar, Getty, Google Maps)Google isn’t keeping the Loop’s most closely watched office redevelopment all to itself. Investment research firm Morningstar is in advanced talks to lease roughly 300,000 square feet on the upper floors of the Thompson Center at 100 West Randolph Street, where the tech giant is currently executing a more than $300 million gut rehabilitation. If the deal crosses the finis