 That same year he moved his studio to Ryōgoku (in Tokyo), naming it "Tsūten-rō" (); some time later, he moved "Tsūten-rō" a short distance to Ueno Ikenohata).In 1868, Yokoyama met Ninagawa Noritane, an official in the Meiji government, who commissioned him to photograph Edo Castle, before its imminent reconstruction, and the Imperial treasures housed in the Shōsōin.The project was completed between 1871 and 1872 and some of the resulting work was published in 1872 as an album of 64 photographs titled "Kyū-Edo-jō Shashin-chō" (, "Photograph Album of the former Edo Castle") and republished as an album of 73 photographs in 1878 under the title "Kanko Zusetsu, Jokakau-no-bu" ("History and description of Japanese arts and industries, part one, the castle").