Apparently the mesh panels on the south side are part of a convection system that makes the building use half the power of other buildings its size. This is interesting, too: "The tower also nudges workers to exercise. Most elevators stop only at every third level, forcing employees to use stairs for part of the journey. To make the climb enticing, wide staircases march past collegial atriums and stop at protruding picture windows."
I think it's even cooler looking than the de Young Museum, which is itself a pretty awesome building. That's just weird, that a government office building would even come close.