sentences:  Together with Seibu Railway, Prince Hotels is the core company of Seibu Group.During the Allied occupation of Japan following World War II, many members of the Japanese peerage lost their titles and were subject to crippling taxation on their real estate holdings.Yasujirō Tsutsumi, who controlled the Seibu Railway through the Kokudo Corporation, arranged to buy several of these families' properties at a discount and used them to develop hotels.