The Okinawa Convention Center's Grand Exhibition Hall and Conference Facility stands as a significant modernist structure completed in 1987. Designed collaboratively by Kokken, Yukio Otani, and the Otani Research Laboratory, this institutional building showcases thoughtful architectural planning for large-scale public gatherings. Located in Ginowan, Okinawa Prefecture, the facility exemplifies the practical design approach characteristic of its era, prioritizing functional efficiency and adaptability for diverse events. Its architectural merit lies in balancing contemporary construction techniques with the spatial demands of exhibition and conference activities, making it an important example of late 20th-century Japanese institutional architecture.