 The main building materials are poured concrete, concrete block, and carved oya stone.The visual effect of the hotel was stunning and dramatic, though not unique; in recent years, architectural historians have noted a marked similarity with the Cafe Australia in Melbourne, Australia (1916), designed by Prairie School architects Marion Mahony and Walter Burley Griffin.The architecture heavily influenced the style of the Kōshien Hotel, which was constructed by Wright's apprentice Arata Endo.