The design consists of transforming a 1950's Joseph Eichler home. Using a complimenting modern material palette, the design utilizes the primary floor plan, transforming the existing space and forming the new second floor by folding out a series of horizontal and vertical planes of the ground floor. The new roof form creates a large central area and links the bedroom wing with living area. Poured-in-place concrete masses are used to support the roofs, upper floor and cantilevered main stair landing.