The outer space treaty says you can't stake a claim but your property rights are still respected under the treaty. That is, if you have a habitat on the surface

The outer space treaty says you can't stake a claim but your property rights are still respected under the treaty. That is, if you have a habitat on the surface of Mars, for all intents and purposes that land is yours though there is an obligation to provide for visits from representatives other countries on a reciprocal basis.