CHICAGO (AP) — A 36-story Chicago landmark, the Tribune Tower, is up for sale. Tribune Media Co. announced Thursday that it has hired real estate investment banking firm Eastdil Secured to explore a sale or find a partner to help redevelop the building, which is home to the Chicago Tribune. Tribune Media phrased the move as an exploration of “strategic monetization alternatives.” The building sits on 3 acres along Chicago’s Michigan Avenue. Here are some features of the historic edifice that make it significant: