Assuming the government district was 方四町 and the Kanzeon-ji Temple district was 方三町, Kagamiyama pointed out that the southern border of them could be aligned on an east-west axis, and also he found that the distance between the eastern border of the government district and the western border of the Kanzeon-ji Temple district was equal to two Cho (approx. 218 meters), then he made a hypothesis that a city development plan based on the Cho unit existed and that many peripheral streets and causeways would match with the idea when he expanded the coverage of the plan.
鏡山は、政庁域を方四町、観世音寺域を方三町と推定した場合、両者の南辺を東西線上に一致させることができること、かつその場合の政庁東辺と観世音寺西辺の間が二町となることをもって、一町を単位とする造成企画の存在を想定し、その適用範囲を広げると周囲の道路や畦畔に合致するものが多いことを指摘。