The new headquarters for the William and Flora Hewlett Foundation is a 48,000 SF, two-story building that includes offices, meeting and presentation rooms, kitchens, and a basement work-out room. The building was the first project in California to receive LEED Gold certification. The project design incorporated many green features.

The parking is partially located in an underground garage, and the outdoor parking lots and paths are paved with a light-colored, recycled-content aggregate that is made with natural resins rather than petroleum-based materials. Stormwater is captured in bioswales and detention ponds on site. Large existing oak trees were retained, and plantings are native and drought-tolerant.

Waterless urinals and water-efficient dishwashers were used to reduce water consumption. The project achieved energy savings of 35% beyond Title 24-1998. The building features low-profile photovoltaic roof panels and an underfloor air system, as well as a thermal ice storage system for efficient cooling.

More than 82% of the wood used in the project was sustainably harvested wood certified by the Forest Stewardship Council, including the framing, siding, and furniture veneers. The building incorporates many recycled-content and low-VOC materials, as well as renewable materials such as recycled cotton insulation, wheatboard, and soy-based countertops.

The project achieved all of the LEED credits related to indoor environmental quality. The building has a lot of natural light and views to the outside, due to ample glazing, light wells, and clerestory windows. The Foundation also went beyond LEED requirements and hired a janitorial company that uses only non-toxic cleaning products.

The Foundation's commitment to sustainability is further demonstrated by their programs to educate staff and the community about the green features in their building.