Legal analysis: trade committees. During the regular property management service, after the establishment of the owners' committee elected by the owners' congress, the owners' congress shall authorize the owners' committee to sign a property service contract with the property company. Therefore, the property contract signed by the industry Committee is signed on behalf of all owners, and it is legal only if it is authorized by the owners' meeting.

Legal basis: Article 215 of the Civil Code of People's Republic of China (PRC) concluded a contract for the establishment, alteration, transfer and elimination of the real right of immovable property; Unless otherwise provided by law or agreed by the parties; The registration of property rights shall take effect when the contract is established; Does not affect the validity of the contract.