Currently housing Union Bank, this 15-story, 157,000-SF building from the 1960s is being converted for residential use. The existing structure consists of a pre-cast concrete moment frame system at the perimeter with no interior columns. As the structural engineer, Miyamoto is performing a structural assessment to ensure code compliance in accordance with the building’s change of use. Our design improves the building’s seismic performance by adding fluid viscous dampers along the façade of the building and concrete shear walls in the short direction. This solution ensures code compliance while maximizing the floor area that can be used as net rentable space.  In addition to the Union Bank building, our engineers assisted in determining the feasibility of building a two- to three-story, Type V residential building over the adjacent two-level parking garage. The results showed that it is feasible to convert the garage into a six-story residential building by adding four additional floors to the existing structure.