KeyArena at Seattle Center, also known as KeyArena, is located north of downtown Seattle, USA on the grounds of Seattle Center (the site of 1962's Century 21 Exposition, a World's Fair). The arena began life in 1962 as the Washington State Pavilion for the Century 21 Exposition. After the close of the Exposition the Pavilion was remodeled as the Washington State Coliseum, one of the centerpieces of the new Seattle Center (the former Exposition grounds).
The Washington State Coliseum would later be renamed the Seattle Center Coliseum; operated by the City of Seattle and named after the Seattle Center grounds. (Wikipedia)