350 Bush Street is a 22-story office tower which incorporates the historic landmark San Francisco Mining Exchange Building (MEB) as its principal entry. Formed in 1862 to centralize trading in mining stocks, the San Francisco Mining Exchange was the second oldest stock exchange in the nation. Trading in mining stocks waned with the decline in mining activity in the 1880s, but in the early 1920s, trading in mining stocks surged again in the general market speculation of the post-World War I era. In response to the surge in trading, the Mining Exchange hired Miller & Pflueger to design the 5,700 square foot 350 Bush Street, which opened in 1923. Subsequently the building was occupied by the San Francisco Curb Exchange (1923-1938), the San Francisco Chamber of Commerce (1938-1967), and Western Title Insurance (1967-1979). The building has been vacant since 1979.
The historic existing building, now will be used as a grand lobby for a modern office building. CJA scope of work includes 50 Underpinning Pits (14,500 FT3), 78 Micropiles (4,810 LF), 37 Soldier Piles (1120 LF) with Kicker/Tiebacks and Steel Structure to support the historic building while the excavation for the new high-rise goes ±30 ft. below the footprint of existing MEB.