Civic Center including the creation of an east-west axial between the Colorado State Capitol, and swinging the north and south borders of the park into the city grid system. These plans were stalled when in 1912, Speer was replaced as mayor. The new mayor brought in Frederick Law Olmsted Jr. who was developing plans for Denver's mountain parks. His ideas included an informal grove of trees on the eastern edge of the park, and a lighted concert area. When Speer was reelected in 1916, he went against Olmsted's designs. Speer instead hired Chicago planner and architect Edward H. Bennett, a protégé of Daniel Burnham. Bennett combined the ideas of all of the previous plans, adding the Greek amphitheater, the Colonnade, the seal pond, and the realignment of Colfax Avenue and 14th Ave., around the park. The park officially opened in 1919. The City and County Building was finished in 1932. Institutions and development Civic Center has long been the government, arts, history, and learning nexus of both the state of Colorado and the Denver Metropolitan Area. Among the institutions in the Civic Center are Denver Art Museum and the Denver Central Library along the park's south side, the Colorado State Capitol and the City and County Building of Denver along the east and west axis of the park, the Wellington E. Webb Municipal Office Building on the park's north side, and the History Colorado Center and the Colorado State Judicial Building to the southeast of the park. The Denver Mint lies immediately west of the Civic Center Park across the street from the City and County Building. The area has seen a new civic development, including the Denver Newspaper Agency (northeast of the park), the home of The Denver Post. Voters in 2004 approved a new Denver Justice Center, two blocks away from Civic Center Park. This project was completed in 2010. Events Civic Center is known throughout the state as the rendezvous for the largest and most important cultural and civic events. Being at the center of the state and local government institutions, Civic Center has become the place for political statement for various groups and individuals representing a variety of causes. In 1990 and 1991, the Civic Center was the location of the CART Grand Prix of Denver. It was Civic Center where the public held a vigil for the victims of Columbine High School massacre, and 9/11.