John Hancock Tower

200 Clarendon Street, previously John Hancock Tower and colloquially known as The Hancock, is a 60-story, 790-foot skyscraper in the Back Bay neighborhood of Boston. It is the tallest building in New England. The tower was designed by Henry N. Cobb of the firm I. M. Pei & Partners and was completed in 1976.The building is widely known for its prominent structural flaws, including an analysis that the entire building could overturn under certain wind loads—as well as a prominent design failure of its signature blue windows, which allowed any of the 500-lb. window panes to detach and fall—up to the full height of the building—endangering pedestrians below.

In 1977, the American Institute of Architects presented the firm with a National Honor Award for the building, and in 2011 conferred on it the Twenty-five Year Award. It has been the tallest building in Boston and New England since 1976.