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CHICAGO — RedShelf, a Chicago-based educational software company, has signed a 16,201-square-foot office lease at 500 N. Dearborn St. in Chicago. The firm had previously been subleasing 13,201 square feet on floors 12 and 13 at the same location. The new office space fosters a collaborative work environment for RedShelf. Christine Torres of Colliers International represented RedShelf in the lease transaction. Bob Zimmerman of Friedman Properties represented ownership.