After the completion of the castle, in the western section of the inner castle were the Daikan-cho residential quarters. The structural divisions depicted on the map of "The Intelligence Report on the Provinces of Chikuzen, Chikugo, Hizen and Higo", which was written by a shōgun's shinobi and compiled in Kan'ei-4 (1627), probably reflect the early days of this castle. The "Illustrated Map of All Fukuoka and Hakata", made in Shōhō-3 (1646), shows different structural divisions in the western section. According to this map, there were five residences for principal retainers in the western section, and the lord's residence was on the west of the stone wall between the Matsunoki-zaka Approach and the Kirinoki-zaka Approach. The only other facility depicted in the map besides the residences was an independent section of the finance department to the south of Takayashiki. A facsimile of a map which was supposedly made in Kanbun-11 (1671) shows that the lord's residence had moved to the west of Takayashiki. This is the residence which was newly built in the same year, and it went by the name of O-shita-no-yashiki. From this time, the lord's residence did not move until the end of Tokugawa Shogunate. In Hōreki-13 (1763), a considerable part of the O-shita-no-yashiki Residence was destroyed by fire and reconstructed the following year. The residence then underwent renovation in Meiwa-7 (1770). The residence contained an audience chamber where the lord met with his retainers, the lord's living quarters, a large and a small study, a lesson room, secretaries' office, a recording room, a finance department office, anterooms for principal retainers and five commissioners, an apartment complex for court ladies, a kitchen, a granary which stored the five primary food staples, a charcoal storehouse, an archive, a treasury storehouse, a "noh" stage, and no less than 15 wells.