After gaining control of Seibu, Kokudo developed the Prince Hotels chain, acquired the baseball team now known as the Saitama Seibu Lions, in addition to continuing its core real estate business throughout the Tokyo area.
Setelah memperoleh kendali atas Seibu, Kokudo mengembangkan jaringan Prince Hotels, membeli ti baseball yang sekarang dikenal sebagai Saitama Seibu Lions, sebagai tambahan melanjutkan bisnis utamanya di bidang real estat di wilayah Tokyo.