His "Row House in Sumiyoshi" (Azuma House, 住吉の長屋), a small two-story, cast-in-place concrete house completed in 1976, is an early work which began to show elements of his characteristic style. It consists of three equal rectangular volumes: two enclosed volumes of interior spaces separated by an open courtyard. The courtyard's position between the two interior volumes becomes an integral part of the house's circulation system. The house is famous for the contrast between appearance and spatial organization which allow people to experience the richness of the space within the geometry.