After World War II, according to Article 88 of the Japanese Constitution, land and buildings such as the Imperial Palace, Goyochi, Imperial Villa, Shugakuin Imperial Villa, Katsura Imperial Villa, Saitama Kamoba (an area designated for duck hunting), and treasures of Shoso-in, all these being the properties of the Imperial Family, became government property (property belonging to Imperial families).
同大戦後は、日本国憲法第88条の規定に基づき、天皇家の資産は原則として国有財産となり、皇居をはじめ御用地、御用邸、修学院離宮、桂離宮、埼玉鴨場などの土地建物、正倉院の宝物などはすべて国有財産（皇室用財産）となった。