There has been much concern that if North Korea was to collapse that a massive refugee exodus to both China and South Korea would occur.  I have laid out before how the South Koreans can stop a massive refugee exodus if the regime was to collapse.  However, establishing North  Korean land rights after a collapse will in the long run ensure that masses of North Koreans do not migrate south:

There are fears that once the country is unified, a mass migration to the South would cause havoc. But North Korean refugees in the South say they would return to the North once the regime is gone. They say there is no reason for them to stay in the South if they can sustain themselves in the North. If their livelihood is secure and they are promised property rights only if they stay in the North, there would be no exodus of North Korean refugees, experts say.  [Chosun Ilbo]

Establishing North Korean land rights should be a priority not to just prevent a massive exodus of people from North Korea, but to also prevent South Korean carpetbaggers from buying up the cheap real estate in North Korea.

If unification is to happen the ROK government should ensure North Korean property rights by preventing South Koreans from buying property in the North.  If South Korean industry wants to do business in the North it should be forced to lease land from a North Korean land owner.  This would give the people incentive to stay in North Korea, give the people a stake in the reconstruction of their own country, and prevent the exploitation of the Northerners by Southern carpetbaggers.