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HARFORD COUNTY, MD. — St. John Properties has broken ground on more than 135,000 square feet of office and flex space as part of the Government and Technology Enterprise (GATE) project at Aberdeen Proving Ground in Harford County. The one-story office building and two flex buildings will be built to silver LEED standards and will represent the completion of the GATE project's first phase. Delivery is expected this summer, and the second phase of construction will begin in May.