Redfin, which bills itself as a next-generation real estate brokerage, is expanding its presence in Chicago. Redfin's current footprint of 8,600 square feet in O'Hare Plaza at 8725 W. Higgins Road near O'Hare International Airport will increase to 26,000 square feet in the same office complex by Dec. 1. Noted Dario Medina, Redfin's Great Lakes District Manager: "Our No.