The developer has to return the purchased auction house to the public before delivery. The maintenance fund is that the maintenance work or improvement work of the public facilities in the community has been completed, and the developer has not used the public maintenance fund, so it will be returned. According to the relevant information, when the developer sells the auction house, he will pay a certain amount of public maintenance fund to the buyer, which will generally be used to maintain and improve the public facilities in the community, such as elevator maintenance, public lighting facilities, roads, landscapes, etc., and it needs to be returned if it is not used up.