The real estate sales agreement has legal effect. According to relevant laws, the parties to a contract shall have corresponding capacity for civil rights and capacity for civil conduct. The parties may, in accordance with law, entrust agents to conclude contracts. A legally formed contract shall become effective upon its establishment. Where laws and administrative regulations provide that approval, registration and other procedures shall be completed to take effect, such provisions shall prevail. Therefore, the agreement is valid.
 Article 490 of the Civil Code Where the parties enter into a contract in the form of a contract, the contract is formed when all the parties sign, seal or fingerprint. The contract is formed when one party has performed its main obligations and the other party has accepted them before signing, sealing or fingerprinting.
 A contract shall be concluded in writing as required by laws and administrative regulations or as agreed by the parties. A contract is formed when the parties fail to adopt a written form but one party has performed its main obligations and the other party has accepted it.