Legal analysis: 1. Sales units should be extracted from the sales price according to a certain proportion. In principle, multi-storey houses shall not be less than 20% of the selling price, and high-rise houses shall not be less than 30% of the selling price. Property buyers shall pay the maintenance fund to the selling unit in accordance with the proportion of 2% 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. Real estate development enterprises shall deposit the maintenance fund of new commercial housing into special banks before handling the initial registration of new commercial housing. The purchaser shall deposit the maintenance fund of the purchased commercial house in a special bank before handling the registration of the change of real estate rights.

Legal basis: Article 165 of the Measures for the Administration of Special Maintenance Funds for Residential Houses, the owners of commercial houses and non-residential houses shall deposit special maintenance funds for residential houses according to the construction area of their own properties, and the amount of the first special maintenance funds for residential houses shall be 5% to 8% of the cost per square meter of local residential construction and installation projects. Owners who sell public housing shall deposit special housing maintenance funds according to their own property construction area, and the amount of the first special housing maintenance funds deposited per square meter of construction area is 2% of the local housing reform cost price. Units selling houses shall, in accordance with the proportion of multi-storey residential buildings and high-rise residential buildings of not less than 20% and 30% respectively, draw special maintenance funds from the houses.