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STERLING, VA. — First Potomac Realty Trust has broken ground on a 56,900-square-foot flex building in the 495,000-square-foot Sterling Park Business Center off Route 28 in Sterling. MSI Worldwide Mail will occupy 24,200 square feet in the property, which is 43 percent pre-leased. Gaithersburg, Md.-based DVA Architects designed the project to sustainable standards.