100 Summer Street is a high-rise building located in downtown Boston, Massachusetts. The building stands at 450 feet (140 m) with 32 floors, over 1.03 million square feet of office space, and was completed in 1974. It is ranked 31st on the list of tallest buildings in Boston. The building is notable for the distinctive bronze tint of its windows. It was designed in a U-shaped footprint to accommodate a small public plaza. Welton Becket and Associates was the architect.