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BOSTON — A joint venture between Carr Properties, National Real Estate Advisors LLC and locally based HYM Investment Group has broken ground on One Congress, a 1 million-square-foot speculative office tower in downtown Boston. The project will include 10,800 square feet of retail space and will anchor Bulfinch Crossing, a mixed-use development that includes residential, hotel, office and retail uses. The office building will top out at about 600 feet and feature 30,000 square feet of fitness, wellness and food and beverage offerings, as well as bike facilities and an outdoor roof garden. Completion is slated for 2023.