Earthquake Survivor Repurposed
This historic nine-story building was constructed in 1904 with unreinforced masonry and a terracotta facade. 1095 Market survived San Francisco’s 1906 earthquake as well as the subsequent fires that consumed the building’s interior. Previously an office building, this high-rise is now undergoing a change-of-use: it will become a hotel with retail and assembly space on the ground floor and roof levels.
Holmes Fire’s fire protection upgrade strategy allows a historic staircase connecting seven levels to remain open, increasing the building’s floor area while maintaining natural lighting.
Holmes Structures undertook the seismic retrofit of this historically significant structure, bringing it up to current code without impacting its defining facade. Minimal concrete shear walls fit discretely within the original layout of the building, preserving the original hallways and interior spaces.
The new structure was reinforced with concrete walls and diaphragm overlays. Holmes Structures enabled soil improvement with spread footings that mitigated the need for piles. The project team is aiming to achieve the Secretary of the Interior’s Standards for the Treatment of Historic Properties.