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OAK BROOK, ILL. — Two information technology service providers, Interactive Business Systems and ManageForce, have each signed leases at Butterfield Office Plaza in Oak Brook. Interactive Business Systems has renewed its lease for 14,448 square feet, and ManageForce has a new lease for 2,762 square feet. NAI Hiffman’s Jud Henry represented DenHoltz, the landlord in the transaction. Aubrey Van Reken, also with NAI Hiffman, represented ManageForce in the new lease.