The Nissei Sangyo Hayama Training Facility Seiunkan, completed in 1974, represents a significant example of corporate architecture from Japan's high-growth era. Designed by architect Shinichi Okada, this social education facility exemplifies the modernist principles that characterized Japanese design during the 1970s. Located in the scenic Hayama area of Miura, Kanagawa Prefecture, the building's design thoughtfully integrates with its natural surroundings while serving as a functional training center. The structure showcases Okada's architectural approach to creating spaces that balance contemporary aesthetics with practical utility, making it a noteworthy case study for those interested in postwar Japanese institutional architecture.