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BOSTON — Developers have broken ground on Longwood Center, a 11-story laboratory building in Boston's Longwood Medical Area. The planned facility will include 414,000 square feet of space adjacent to the Joslin Diabetes Center. A joint venture between National Development, Charles River Realty Investors, Alexandria Real Estate Equities and Clarion Partners is developing the project. The project is scheduled for completion in the fall of 2014.