Otani's design won the major competition, for which there were almost 200 entries. The building has an unusual hexagonal framework, resulting in few vertical walls or columns. The conference centre has a trapezoidal shaped base. The shape is repeated on different scales and thrusts throughout the complex. The different functions such as the conference, press, administrative and visitor areas are organized across different levels.The total facility provides 156,000 m2 of meeting space, and consists of the main Conference Hall with large meeting room (capacity 2,000) and a number of smaller rooms, an Annex Hall and Event Hall, with the Grand Prince Hotel Kyoto nearby. The exposed concrete serves in part to clad the load-bearing steel structure.