The former residence of the Koga Mochizuki clan (Omi Province), the leader of the 53 Families of Koga is extant as Koga-ryu Ninjutsu Yashiki at 2331 Ryuboshi, Konan-cho, Koka City (which is different from Koga-no-sato Ninjutsu-mura [Koga Ninja Village]).
甲賀市甲南町竜法師2331番地に、甲賀五十三家の筆頭格であった望月氏甲賀望月氏（近江国）の旧居が甲賀流忍術屋敷として残る（「甲賀の里忍術村」とは別）。