Dean Foods Co., a milk and dairy products company, will move its corporate headquarters to the Towers at Cityplace in Dallas. Cityplace is a 42-story, 1.3 million-square-foot office tower at 2711 N. Haskell Ave. It was reported that Dean will now occupy more than 177,000 square feet on floors 34-39 at the new location. The move will take place between December and next March.