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LISLE, ILL. — Duke Realty Corp.'s Chicago office has completed construction of Navistar Inc.'s new corporate headquarters campus in Lisle. The project involved renovating 1.2 million square feet of interconnected buildings and new construction totaling 27,000 square feet. Crews upgraded electrical systems, refurbished building exteriors and added a 15,000-square-foot technology design center. The Navistar project was completed in 12 stages over a one-year period.