The teahouse "Yosui-tei" is a valuable building that has been engraved in 1821 on the tiles for more than 200 years. It is a building with a total floor area of 94 tsubo and 19 rooms, and is a rare building in Japan that remains in its old state on the old site as a villa building used by the feudal lord. In addition, not only the part used by His Highness, but also the surrounding area is almost completely preserved. Due to deterioration, it was completely dismantled and repaired from Heisei 3 to Heisei 6 for the preservation of cultural properties under the jurisdiction of the Agency for Cultural Affairs, and it retains the appearance of the past.