Keizan founded several temples throughout his lifetime, most notably Yōkō-ji and Daihonzan Sōji-ji (originally founded on the Noto Peninsula, and moved to Tsurumi in Yokohama in 1911).
Ōnishi′s ashes were divided between two graves – one at the Zen temple of Sōji-ji in Tsurumi, Yokohama, and the other at the public cemetery in former Ashida village in Hyōgo prefecture.