High Quality Content by WIKIPEDIA articles! Columbia Center (formerly Bank of America Tower and Columbia Seafirst Center) is the tallest skyscraper in the downtown Seattle skyline, as well as the tallest building in the State of Washington, and the Pacific Northwest region of North America. It occupies most of the block bounded by Fourth and Fifth Avenues and Cherry and Columbia Streets. At 284.2 m (932 ft) it was the tallest skyscraper west of the Mississippi River when construction was finished; it is currently fourth by that metric, the second tallest building on the West Coast, and the twentieth tallest building in the United States. 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 L. Lindsey Architects who also designed the Fourth and Blanchard Building in the Belltown neighborhood, and was built by Howard S. Wright Construction.