Masamori became the custodian of this shoen (private estate) and annexed the nearby Todai-ji Temple property, gaining actual land ownership by eliminating control by the Todai-ji Temple and the Kokuga (provincial offices) with the backing of Shirakawa's political power.
正盛は預所となり、周辺の東大寺領も取り込んで立荘するなど、白河の政治権力を後ろ盾に東大寺や国衙の支配を除去して実質的な土地所有に成功した。