Board Thread:News and Announcements/@comment-3309116-20131012164814/@comment-11344559-20131014174219

though now that i've got some sleep and thought about it, it is possible the land was bought in the higashikata's name by the speedwagon foundation. Seeing how jotaro is a marine biologist, it is possible he found out about the abalones around morioh and probably investigating it. It then can be thought he got the speedwagon foundation to buy the land in the higashikata's name just because they live there and maybe to help keep people away.

but this is a one shot, so almost anything can be said that could make sense as to why.