350 Bush Street

Built in 1862, the San Francisco Mining Exchange operated as one of the West Coast’s most flamboyant financial institutions for 105 years. It stood idle for nearly 40 years before being redeveloped into a 19-story, 372,000-SF Class A office tower with a roof terrace and a 2-level underground parking garage. Langan performed a geotechnical investigation and developed site-specific seismic response spectra for two levels of ground shaking; reviewed shoring, underpinning, and foundation plans; and provided consultation and observation during site excavation, underpinning, shoring, tieback testing, and foundation installation. Because of elevated levels of petroleum hydrocarbons detected in the fill material from prior land use, our environmental team prepared a site mitigation plan and provided oversight for sampling and chemical analysis during soil handling and disposal activities, and prepared the site closure report.

2018 ASCE Outstanding Sustainable Engineering Project