The John Hancock Tower, colloquially known as the Hancock, is a 60-story, 790-foot skyscraper in the Back Bay neighborhood of downtown Boston. Designed by Henry N. Cobb of the firm I. M. Pei& Partners, it was completed in 1976, and has held the title as the tallest building in New England ever since. In 2015, the lease belonging to the John Hancock Mutual Life Insurance Company, for which the skyscraper was named, expired, and it was renamed to its address at 200 Clarendon Street.