When selling commercial housing, the buyer pays the maintenance fund to the real estate bureau according to the proportion of 2% of the purchase price, and the real estate bureau will issue you a unified invoice for the special maintenance fund. However, at present, many real estate developers or property management companies charge public maintenance funds when handing over the house. In order to ensure that the developer pays the money, you should go to the Property Management Office of the Housing Authority to check whether your public maintenance fund has been paid.