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BURR RIDGE, ILL. — Burr Ridge-based Mars Equities is developing a three-story, 90,000-square-foot speculative office building as the final phase of construction of Estancia Executive Center, located at 180 Harvester Dr. in Burr Ridge. This phase comes on the heels of NAI Hiffman fully leasing the other two speculative buildings in the development, which together total 160,000 square feet. NAI Hiffman will also handle leasing for the new building, which is slated for completion in first-quarter 2009.