Jeff Brooks has an intriguing, but I think fundamentally flawed idea: to set up an international organization to manage Martian land sales.
I’m all in favor of granting title rights off planet, and agree that it could provide a useful mechanism to raise private funds for planetary exploration, but I’m afraid that a transnationalist approach is doomed to failure. Better to simply amend the OST (or withdraw, failing that) and allow sovereignty claims (in fact the treaty could come up with a way to equitably distribute the claims). But I wouldn’t trust an international organization to safeguard my civil or property rights, given the nature of the international community.