1. First, the building owners' committee and the property management company negotiate to determine the external wall maintenance projects and funds, and define the maintenance responsibilities and standards.

2. Secondly, the property management company introduces the project to the owner and solicits opinions, and collects the owner's signed consent, including the amount of funds and the signature of the collateral.

3. Finally, the property management company is responsible for keeping the owner's signed consent and providing it to the external wall maintenance unit in time, so that the maintenance unit can carry out maintenance works according to the provisions of the signed consent.