100 Summer Street is a high-rise building located in downtown Boston, Massachusetts. The building stands at 450 feet (137 meters) with 32 floors, over 1 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. It was designed in a U-shaped footprint to accommodate a small public plaza.