In 1906, a major earthquake devastated San Francisco and destroyed more than 28,000 buildings, many as a result of subsequent fires. As the city rebuilt, it adopted a plan for a civic center, first developed in 1899 by English architect B.J.S. Cahill, to consolidate government buildings in a central location. The last building completed for the San Francisco Civic Center, the Federal Building was a critical component of the seven-building complex that included government buildings, a library, and an opera house. The Civic Center design incorporates City Beautiful planning, a concept that relies on Beaux Arts design principles and classically inspired, monumental architecture. San Francisco's Civic Center is one of the nation's most successful examples of the City Beautiful movement.