Legal basis: Article 209 of the Civil Code of People's Republic of China (PRC) establishes, changes, transfers and extinguishes the real right of immovable property, which will take effect after being registered according to law; Without registration, it will not take effect, except as otherwise provided by law. Natural resources owned by the state according to law may not be registered. Article 215 A contract concluded between the parties on the establishment, alteration, transfer and extinction of the real right of immovable property shall become effective upon the establishment of the contract, unless it is otherwise provided by law or agreed by the parties. Failure to register the real right shall not affect the validity of the contract.