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CHICAGO — Aon has signed a 15-year lease for 396,406 square feet of office space at 200 E. Randolph St. in Chicago. After 14 years as a sublease tenant in the 83-story East Loop Tower, the global risk management firm will enter a new direct lease agreement beginning Dec. 2013. Opened in 1972, the Aon Center features a 205-seat auditorium and views of the city and Lake Michigan. Meredith O'Connor of Jones Lang LaSalle and Greg Gerber of Studley represented the tenant in the transaction. Steve Smith and Mike Curran of Jones Lang LaSalle represented the owner, Piedmont Office Realty Trust.