This design is very well suited to the building's "physical environment." Better yet, Nagano Heiji even had the idea of avoiding "secondary smoking," for he provided rooms on each floor at the four inside corners of the "日" shape, as smoking rooms.
更絕的是，長野平治當時甚至已有「拒吸二手菸」的點子，因為他在「日」字型內側四角設計的隔間，就是各層樓的吸菸室。