Housing maintenance fund (overhaul fund), paid before handling the loan, some to the developer, and some to the District Housing Authority; Overhaul fund is generally 2%-3% of the purchase price. Generally speaking, when the buyers get the keys to check in, the developers will collect the housing maintenance funds. Some cities are also calculated according to the area and elevator room, such as elevator room 80 yuan/square, staircase 50 yuan/square;