John Hancock Tower (200 Clarendon Street)

The John Hancock Tower, officially 200 Clarendon Street, is a 60-story glass skyscraper designed by I.M. Pei and completed in 1976, and it is the tallest building in Boston. The tower became notable during construction for problems with its glass curtain wall, including incidents of panes falling that led to a comprehensive window replacement and engineering revisions. It remains an iconic feature of Boston's Back Bay skyline and a focal point of the city's modern architectural history.