Excavations that have been taking place since 1990 have unearthed sand used in Heian period construction and maintenance is currently underway to restore the building to how it would have been at the time of its construction.
平成2年（1990年）からの発掘調査により平安時代築造の州浜が検出され、現在は創建当初の姿に復元整備されている。