The plot is located along the Toden Arakawa line with abundant mood of its locality.

Because of the road expansion along the railroad, large-scale city development would take place and the lot was obligated to set back. In this occasion, the owners had decided to renovate their residence into a duplex and this project started.

The residue of the setback shaped triangular. On the first floor, the husband holds a garage for his private and business cars. The two families share the stair case from the core outer stairs which perforate and make the box sequential space. The south orienting side facing the street is entirely covered up with horizontal windows which provide efficient sight and light. Even though the plot being limited and polygonal, TRICO provides open and luxury space with the unexpected method.