Ownership Of Land - A Deeply Flawed Concept?

[Sonoran Na'vi]

The only system I can see that would work in the place of land ownership is a system of land-use rights. Though, one problem I see with land-use rights is what happens if one builds a building, but then no longer holds rights to use the land. Why should this person build the building if they may lose the right to use the land in which it stands?

I tend to think land ownership is important to the functioning of our economic systems. I know property rights (not specifically land) is important to the functioning of an economy.