Incidentally, the so-called 'Kuro-mon Gate' that was in the once Shozoku-yashiki Premises of the former Satsuma clan and that was used as the main gate of the Rokumei-kan Pavilion was designated as a former national treasure.
なお、鹿鳴館の正門として使用された旧薩摩藩装束屋敷跡の通称「黒門」は旧国宝に指定されていた。