100 Summer Street is a high-rise building located in downtown Boston, Massachusetts. The building stands at 450 feet (137.2 meters) with 32 floors, over 1.03 million square feet (over 92,000 m²) of office space, and was completed in 1974. It is currently the 23rd-tallest building in Boston. The architectural firm who designed the building was Welton Becket and Associates. 100 Summer Street is notable for the distinctive bronze tint of its windows.