The Los Angeles County Hall of Administration, along with the adjacent Los Angeles County Courthouse, were designed simultaneously by a team of noted, local architects and artists of the period. Both buildings were conceived as part of the 1947 Civic Center Master Plan, a monumental plan that transformed a large portion of Bunker Hill through the westward expansion of the Civic Center and created the east-west axis of government buildings that frame today’s Grand Park.

The County Hall of Administration was completed in 1960 and serves as the seat of the county government. Prior to its construction, the Board of Supervisors and other administrative and legal functions of the county government had been housed in the former 1911 Hall of Records. At the time of its completion, the Hall of Administration was noted for its lavishly appointed interior, which was critiqued by some at the time, including former Supervisor Kenneth Hahn. The Hall of Administration was in later years renamed in his honor.