When I was visting Israel to decide which community I wanted to live in, a person there suggested that I buy a room or closet in someone's house so that I can be currently owning some land in Israel. At that point, I would be only required to keep one day Yom Tov.
If they decide in the middle of Yom Tov that they want to move to Israel, in that case (if the logic works at all) you would not be able to purchase the item. I don't know what would happen if someone who keeps 1 day decided to buy you the land and then give it to you as a gift.. perhaps that could work.