Seattle City Hall (also known as the Seattle Municipal Building) is located in downtown Seattle, Washington, between 4th Avenue and 5th Avenue. The building houses the offices of the Seattle City Council and the Mayor of Seattle. Most city departments are located in the nearby Seattle Municipal Tower. In 2003, the Seattle city government moved into a new, "green" city hall building. Until 1962, the city government operated from the King County Courthouse, alongside the King County government. The new City Hall and Plaza, together with the adjacent Seattle Municipal Tower, Seattle Justice Center, and (unbuilt) Civic Square, comprise the Seattle Civic Center. From: http://en.wikipedia.org/wiki/Seattle_City_Hall

Seattle’s City Hall, located at 600 Fourth Ave., replaced the Municipal Building. It houses offices and chambers for the Mayor, City Council, City Attorney and other City functions. City Hall is the symbolic heart of the Civic Center, and an important public landmark that invites Seattle’s citizens to participate in and celebrate their community, while creating an efficient workplace for City government. Schedule: Completed: 2003; Budget: $72 million; Architects: Bassetti Architects/Bohlin / Cywinski Jackson Joint Venture. From: http://www.seattle.gov/fleetsfacilities/civiccenter/cityhall.htm