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BOSTON — The Fallon Co., a locally based developer, has broken ground on a 310,000-square-foot office building for Massachusetts Mutual Life Insurance Co. (MassMutual) in Boston’s Seaport District. The build-to-suit property will be located within the $4 billion Fan Pier mixed-use development and is expected to be complete by late 2021. Approximately 1,000 employees will work at the 17-story building, which will serve as a hub for the company’s digital and technology divisions. MassMutual also plans to add about 1,500 jobs at its headquarters in Springfield, Mass., by the end of 2021.