The site was over 10 hectares in size, and the power of the Retired Emperor who also backed the Taira family allowed him to demolish the surrounding buildings to create an expansive estate in which the three Imperial palaces, Nan-den, Sei-den and Hoku-den (Southern Palace, and Western Palace, Northern Palace), were built.
その敷地は十余町、平家をうしろだてにした上皇の権威で、周囲の建物はとりこわされ、広大な敷地に南殿、西殿、北殿の三御所がつくられた。