This building is a complex facility of office and training accommodation for a life insurance company. The greatest feature of this building is a massive void (40m×40m), which is located in the center of the floor (100m×100m). Office spaces are arranged around this large void. This building introduces natural light and natural ventilation that utilize a large void. It plans to minimize the skin load while introducing natural light and wind, air-conditioning and ventilation plans to realize a large space office, conducted the air-type radiation panel by the equivalent temperature control. As a result, we realized 1,185MJ/sqm this year.