Octagonal chambers

Octagonal chamber today (courtesy of the Third Bureau, Office of the President)

Originally designed as smoking rooms of the Office of the Governor-General, each of the four chambers was situated in an inner corner of the building, facing the courtyard. When the original design for the building was being reviewed and the question of whether the octagonal chambers were desirable, it is said that they were kept in the design because Tatsutaro Nakamura felt that they would make the building more resistant to earthquakes.