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BOSTON — The Mount Vernon Company has purchased a 46,000-square-foot mixed-use property located at 434 Massachusetts Ave. in Boston's South End for $4 million. The building was created through the combination of four brownstones and serves as a business incubator for the local community. It features an outdoor courtyard and high ceilings. Mount Vernon plans to upgrade the property in the near term. The seller's name was not disclosed.