Seismic durability was a central aspirational goal for the structural design of the SFPUC building, as part of their intent to provide the best value possible for the City and County of San Francisco. This goal entailed reducing the potential for lengthy building closures for repairs, such that the facility and its key operations can be maintained following an earthquake, and preserving the large investment in resources and embodied energy for the construction of a new large building. For seismic resistance, an innovative system of self-centering concrete core walls was developed, incorporating vertical post-tensioning tendons to add strength and elasticity to re-center the structure. The floor structure was optimized to incorporate shallow post-tensioned beams with a relatively thin post-tensioned one-way slab, providing a simple and cost-effective method of constructing a floor structure.