Columbia Center (formerly Bank of America Tower and Columbia Seafirst Center) is the tallest skyscraper in the downtown Seattle skyline, as well as (according to real structure and number of habitable floors) the tallest building in the State of Washington. It occupies most of the block bounded by Fourth and Fifth Avenues and Cherry and Columbia Streets. At 284.2 m (932 ft) it is currently the second tallest structure on the West Coast (after Los Angeles' 72 stories U.S. Bank Tower), when the antenna is counted as structure. It contains 76 stories of class-A office space above ground and seven stories of various use below ground, making it the building with the most stories west of the Mississippi. Construction of this building began in 1982 and finished in 1985. It was designed by Chester