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BOSTON — Related Beal has acquired 451 D Street, a nine-story, mixed-use development in Boston’s Seaport District for an undisclosed price. The company previously owned the building before selling it in 2012. The seller was a joint venture between State Street and Meritage Properties. The development, which is 85 percent leased, offers more than 477,000 square feet of lab and office space as well as an amenities package that includes a 3,000-square-foot fitness center and a 20,000-square-foot on-site child care center. The tenant roster includes Alion Science & Technology, RDK Engineers and JPMorgan Chase.