According to the Measures for the Management of Facilities and Equipment Maintenance Funds in Residential Areas jointly issued by the Ministry of Housing and Urban-Rural Development and the Ministry of Finance: 1. When selling a commercial house, the buyer and the seller shall sign a house maintenance fund payment agreement, and the buyer shall pay the house maintenance fund to the seller in the proportion of 2-3% of the purchase price. 2. The maintenance fund collected by the selling unit belongs to all owners and is not included in the residential sales income. 3. The current deposit standard of the first special maintenance fund is: 90 yuan/m2 for high-rise buildings (including multi-storey buildings with elevators) and 50 yuan/m2 for multi-storey buildings (including villas). Maintenance fund, also known as "public maintenance fund" and "special maintenance fund", refers to a fund that the owners of residential properties pay a certain amount of money to a special account for the maintenance of public parts and facilities in the property area, and authorize the owners' committee to manage and use it in a unified way. The maintenance fund is raised by the owners of the property, who enjoy the ownership of the maintenance fund according to the proportion of payment, but the right to use it belongs to all owners, and individual owners may not withdraw all their own maintenance funds from the bank. The maintenance fund is combined with a specific house, exists with the existence of the house, and is also lost with the existence of the house, and does not change because of the change of the specific owner. When the house property right is changed to a new owner, the maintenance fund should also be renamed from the old owner to the new owner.