From what I know most houses in Indonesia can be bought without actually owning the land. So I doubt they own the land on these houses. Next to that, there is

From what I know most houses in Indonesia can be bought without actually owning the land. So I doubt they own the land on these houses. Next to that, there is a huge leasing and lending market in Indonesia. So I would guess that these houses are bought with a mortgage but they don't own the land.