The Kofuzo is a large storehouse which dates from the early Heian period (794–929). It is a narabigura twin-storehouse consisting of two separate storehouses, one at each end, covered by one roof. The building was used to store Buddhist valuables. Priests would have moved treasures in and out of the building using the doors at the center of the two storehouses. Like the Shosoin treasure house at Todaiji Temple in Nara, one of the distinctive features of the Kofuzo is its raised floor, which helps to keep the interior from acquiring too much moisture.