I am not sure that the property contract is invalid.

If the realty service contract is deemed invalid and the realty service enterprise has provided realty service, the invalidity of the contract is mainly caused by the fault of the realty service enterprise or the construction unit, and the realty fee can be calculated according to the service items and service quality provided by the realty service enterprise and with reference to the guidance price set by the local government department. However, if the property fee agreed by both parties is lower than the guidance price, the property fee shall be paid according to the contract; If the invalidity of the contract is mainly caused by the fault of the owner, the property fee can be paid according to the contract.