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The Pacific-Union Club is a social club located at 1000 California Street in San Francisco, California, at the top of Nob Hill. It is a well known club of the West Coast,[citation needed] clubs in the United States.
It was founded in 1889, as a merger of two earlier clubs: the Pacific Club (founded 1852) and the Union Club (founded 1854). The clubhouse was built as the home for silver magnate James Clair Flood. The former Flood Mansion was designed by Canadian architect Augustus Laver and is located in the Nob Hill neighborhood. The reconstruction and expansion of the original Mansion into the clubhouse was designed by Willis Polk. It is considered the first brownstone constructed west of the Mississippi River. Along with the Fairmont Hotel across the street, it was the only structure in the area to survive the San Francisco earthquake and fire of 1906.