 In addition to the exterior shading devices, occupants can make further adjustments from within the building using manually-operated interior roller fabric shades above each window.On top of the David Brower Center, there is a photovoltaic array that offsets approximately 35 percent of the building’s electricity energy demand.The solar panels are located on the northern and southern edges of the roof parapet, and double as an awning for the southern façade to reduce solar heat gain.