The renovation of this mid-century box in San Francisco expands the envelope to capture panoramic views of the city while also embracing a sustainable design approach. The addition, located behind the existing structure and set slightly lower than the original floor levels, responds to the down sloping terrain and creates dynamic intersections between the two volumes. To minimize waste, the original rooms were preserved on the upper level as bedrooms allowing for continuity between the Kitchen, Living, and Dining areas on the main level. Planning for the future, the roof is outfitted with racks and conduit sufficient for solar panel installation.