Based on the Law for the Preservation of National Treasures, Tokugawa Family Mausoleum (personal ownership) in Tokyo and Nagoya Castle (owned by Nagoya City) and so on were designated in 1930 as national treasures; the next year (1931), the paintings, etc., which were housed in the Tokyo School of Fine Arts (the present-day Tokyo University of Arts) (and owned by the nation) were designated as national treasures.
国宝保存法に基づき、1930年（昭和5年）には東京の徳川家霊廟（個人の所有）、名古屋城（名古屋市の所有）などが国宝に指定され、翌1931年（昭和6年）には東京美術学校（現・東京藝術大学）保管の絵画等（所有者は国）が国宝に指定された。