808 Brannan – Pinterest Headquarters Seismic UpgradeSan Francisco, California
- Located in San Francisco, California
- Consists of two adjacent structures
- A 2-story structure with a partial basement, comprised of a wood floor and roof system supported by both timber and steel columns
- A 1-story steel building with a wood roof structure, which is a historic landmark built in 1938
- Seismic ties are used to join the two structures into a single space
- A comprehensive Probable Maximum Loss (PML) seismic risk assessment of the combined structure was conducted
- As a result, several seismic upgrade options were developed and implemented with a goal of reducing the overall exposure to below a 20% PML level
- An 8,000 sf mezzanine expansion is incorporated into the seismic upgrade along with several structural strengthening measures
