Linda Laban -- Realestate.boston.com correspondent December 9, 2020 7:18 pm The soaring glass-clad Sudbury stands in stark contrast to the now-demolished, Brutalist-style Government Center Garage, which for decades straddled Congress Street where this 48-story residential tower now dominates. The Sudbury’s completion marks the beginning of a mixed-use, six-building, five-acre development on both the west and east sides of Congress, in one of Boston’s oldest neighborhoods. “The big, ugly garage is gone,” said Thomas O’Brien, founding partner and managing director of Bulfinch Crossing’s development firm, The HYM Investment Group, which is also behind the Suffolk Downs and Boston Landing developments, among others.