350 Bush Street

San Francisco, CA

Market: Office




2020 Gold Nugget Award, Best Rehabilitation Project, PCBC
2020 Gold Nugget Award, Best Commercial Project - 20,000 sq ft, PCBC
350 Bush Street

The development at 350 Bush Street incorporates the existing 1920s Mining Exchange with a nineteen-story, glass-clad tower and a five-story, mixed-use building. The complex offers tenants outdoor space at many levels, including setback roof decks and plazas. The project also includes replicating ornamental terra-cotta at the Mining Exchange’s pediment. SGH consulted on the building enclosure design for the new tower and the structural attachment of new terra-cotta.

Scope | Solutions

SGH consulted on the design of waterproofing at terraces and plazas, and roofing. Highlights of our work include the following:

  • Helped select roofing and waterproofing systems, including a new metal roof for the Mining Exchange

  • Reviewed the proposed design and recommended ways to improve performance

  • Developed details to integrate the roofing and waterproofing with other enclosure systems

  • Provided construction administration services, including reviewing submittals and observing ongoing construction

At the Mining Exchange, SGH designed new structural steel anchorage to attach new terra-cotta acroterion and anthemion pieces to the roof structure. Highlights of our work include the following:

  • Evaluated the stacked acroterion terra-cotta and detailed steel frames to fit within the assemblies

  • Designed a system to connect the hollow terra-cotta acroterion blocks to the frames, and anchor the frames and anthemion blocks to the existing roof structure

  • Coordinated the roof anchorage and terra-cotta installation with the roofing

  • Provided construction administration services, including reviewing terra-cotta and anchorage shop drawings, observing ongoing construction, and assisting the contractor during installation

Project Contact(s)