In the 1960s, when the Northern California utility company Pacific Gas and Electric (PG&E) built a substation in the Tenderloin neighborhood of San Francisco, the company’s in-house design team went all-out on the exterior lighting. In addition to a row of modern sconces that provided dramatic uplighting, the building had a translucent backlit wall that dominated the corner of Larkin and Eddy streets. The sconces have been supplanted by security lighting, and the glowing wall has gone dark. However, the San Francisco–based firm TEF has brought some of the glimmer back with a small 12,000-square-foot addition to the main building.