Veterans Commons in San Francisco, CA: a new tower on the building’s backside provides a new bank of elevators and additional structural support to the existing building. (Photo by Mignon O’Young)

Veterans Commons in San Francisco, CA: a new tower on the building’s backside provides a new bank of elevators and additional structural support to the existing building. (Photo by Mignon O’Young)

Veterans Commons in San Francisco, CA: a new tower on the building’s backside provides a new bank of elevators and additional structural support to the existing building. (Photo by Mignon O’Young)