The plot is located at the intersection facing a large highway along the Toden Arakawa-line.

The owners are a computer company agent and his wife and their new born daughter.

The master who used to be an automobile designer had wished to own a luxury and aesthetic residence.

The plot is a trapezoid form and less than 60 m2. Thus trapezoid shapes appear everywhere as the motif. Side-roofed wall made of legal barium steel panels and wide-opened are arranged in the façade.

On the first floor, the masters study space is laid out widely in the center while the water space and bedroom are embedded along the outline.

The second floor has a large sequential space with the wifes kitchen counter and dining table lead from the 1st floor with skip floors.

The access to the rooftop is the stairs which brace up the space as a symbol. The crossover of the north trapezoid top lights and natural light coming through the south series of windows performs as an illusion.