Historic Renovation

Presidio Building 210 – Post Office, Presidio of San Francisco, CA

The Building 210 renovation included the seismic strengthening of the unreinforced brick masonry bearing wall system. The building is a single story over a partial basement, and was strengthened in accordance with the requirements of the Uniform Code for Building Conservation, Appendix Chapter 1, Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings. Seismic strengthening of the building consisted of connecting the floor and roof diaphragms to the unreinforced brick masonry bearing walls to resist in-plane and out-of-plane seismic forces, adding sheathing to the attic floor, and adding out-of-plane wall bracing at the first floor brick walls.


Berkeley Public Library, North Branch, Berkeley, CA

The North Branch of the Berkeley Public Library was originally constructed in 1936, and is considered a local historic landmark.  This project consisted of the full architectural renovation of the historic library spaces, the seismic strengthening of the existing structure, and the construction of a new 2-story addition at the rear of the library. 

Seismic strengthening of the existing building included anchorage of the concrete bearing walls and rotunda to the floor and roof, and plywood strengthening of the floor and roof diaphragms. 

Demolition of two room extensions behind the existing library building allowed for construction of the new 2-story addition, which consisted of concrete bearing walls and wood floor and roof framing.  The existing building was also underpinned to allow for construction of the lower level of the addition.