The Obayashi Corporation Technical Research Institute Main Building is a pioneering example of ultra-energy-efficient architecture completed in 1982. Located in Kiyose, Tokyo, this institutional structure was designed by Obayashi Corporation as a research and educational facility. The building represents an innovative approach to sustainable design, incorporating advanced energy-conservation technologies that were groundbreaking for its era. Its architectural significance lies in demonstrating the practical application of environmental consciousness in commercial and institutional construction, making it an important reference point for architects studying the evolution of green building practices in Japan.