Panjo is an innovative multipurpose facility completed in 1974 in Sakai, Osaka, representing a significant architectural achievement of the 1970s. Designed by the collaborative team of Kankyō Kaihatsu Kenkyūjo and Sakakura Architectural Research Institute, this structure skillfully integrates indoor sports facilities with commercial spaces. The building exemplifies the era's forward-thinking approach to mixed-use design, combining athletic and retail functions within a cohesive architectural framework. Panjo remains an important reference point for understanding Japanese architectural practice during the post-war economic expansion period, particularly in the development of community-centered facilities that serve multiple public needs.