Obtaining the position of jinin (associates of Shinto shrines) at Kitano-sha Shrine (present Kitano Tenman-gu Shrine), the kojiya formed a guild called 'koji-za' and had exclusive rights to produce and sell koji malt in the western part of Kyoto backed by the authority of Kitano-sha Shrine (honjo (proprietor or guarantor of manor)).
麹屋は北野社（現在の北野天満宮）の神人（じにん）身分を得て「麹座」と呼ばれる同業者組合（座）を結成して北野社（本所）の権威を背景に京都西部の麹の製造・販売の独占権を有していた。