The property should write a format guarantee to the owner to ensure that there is no property fee.

The content format of the letter of guarantee includes: title, introduction of Party A, introduction of Party B, reasons, commitment of Party A, commitment of Party B and signature. According to the relevant provisions of the Civil Code, developers and property management companies have their own independent legal personality and are different subjects of legal relationship. What is formed between the owner and the developer is the contract relationship of house sale, and what is formed between the owner and the property company is the contract relationship of property service, which belongs to different civil legal relationships. Therefore, the commitment and publicity of the developer's lifelong exemption from property fees will be effective for the property company if a contract is reached with the property company in advance or the commitment is established after ratification by the property company. Otherwise, the developer's commitment to the property company is invalid, and the owner should pay the property fee.