• The city Public Utilities Commission Building is 13 floors and can accommodate about 900 people while using 60% less water and 32% less energy than comparable structures.
• A system called The Living Machine treats all the building's wastewater and reclaims enough for all the toilets.
• The building uses power generated by hydro at the Hetch Hetchy Reservoir and has integrated solar and wind generating capacity.

From the article:

Last week, the city of San Francisco announced the grand opening of the Greenest Urban Office Building in North America.