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The UCSF Institute for Regeneration Medicine is a remarkable example of how architectural ingenuity can overcome even the most difficult challenges.

Because the University of California SF is located on a mountainside, its available room for expansion is fairly limited. Rafael Viñoly Architects have cleverly approached that problem by designing the UCSF Institute for Regeneration Medicine to be a horizontal green-roofed tower that curves and contours with the sloping hillside. The building houses four giant green roof terraces that help regulate the institute's interior temperatore while also soaking up rainwater -- two benefits that contributed to the building's Silver LEEDs status.