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HARFORD COUNTY, MD. — St. John Properties has acquired a 60,000-square-foot office building and a 10-acre parcel of land, assets that were previously owned by Opus East, for an undisclosed amount. The building is located in the Aberdeen Proving Ground at 6240 Guardian Gateway in Harford County. It is fully leased to CACI International, which leases 45,000 square feet of space to the U.S. Army Joint Satellite Command. The undeveloped land can support a three-story, 75,000-square-foot office building.