101 Clarendon Street, also known as Columbus Center, was a proposed skyscraper planned for Boston, Massachusetts. If completed, it would have stood as the 25th-tallest building in Boston. Continuing on the trend established by the Prudential Tower in 1964, the completed building would have concealed more of the Massachusetts Turnpike (I-90) by utilizing air rights above it. The location would have been above the turnpike, directly to the east of Back Bay station and south of Copley Square in the Back Bay neighborhood of Boston. The project would have "united the city’s Back Bay and South End neighborhoods."