Throughout northern Osaka Prefecture there are several condominium buildings designed by architect Tsuyoshi Endo. Their experimental plans and building groupings that skillfully exploit the hilly terrain remain popular today, but aging building systems and the relatively modest thermal and acoustic performance compared with current standards make specification upgrades a pressing issue. This project is one such apartment unit. It features a distinctive maisonette configuration with continuous circulation organized around a central staircase. The clients had lived in the residence for many years with strong attachment and wished to remain, but changes in lifestyle and the need for repairs prompted a renovation. Unlike purchasing a different used property, renovating a long‑occupied home requires a pragmatic, remedial approach because familiar room layouts and circulation the occupants do not want to change coexist with elements they have long found problematic. In architecturally detailed apartment buildings the layout and structural frame are often inseparable, and a well‑crafted plan can retain an enduring collective residential quality. Rather than starting from a full strip‑out, we proposed a grafting‑like renovation that inherits the previous architect’s layout and develops it further.
Use: Multi-family residential building; Structure/Scale: Reinforced concrete construction — part of a 4-storey building (project scope: 2nd and 3rd floors); Area for unit-cost calculation: 37 tsubo [123 m2]; Design supervision: Yoshihiro Yamamoto [YYAA]; Construction: Matsumoto Construction; Lighting design: Shingo Ishido [DAIKO Osaka TACT]; Fabrics: fabricscape; Exterior works: Takeo Matsushita [soji] c