Legal analysis: 1. The standard of special maintenance funds is: high-rise (including multi-storey with elevator) 90 yuan/square meter, multi-storey (including villa) 50 yuan/square meter (the standard of housing maintenance funds in different places is linked to the economic level, and the specific charging standards are slightly different); 2. Beijing Housing Maintenance Fund = cost per square meter of construction area × proportion× area. 3. It should be noted that the specific standard of maintenance funds is determined by the local real estate department in Beijing, so the proportion of maintenance funds in different regions is different.

Legal basis: Measures for the Administration of Maintenance Funds for Facilities and Equipment in Residential Areas Article 5 When selling commercial houses, the buyer and the seller shall sign an agreement on payment of maintenance funds. Property buyers should pay the maintenance fund to the selling unit according to the proportion of 2%-3% of the purchase price. The maintenance fund collected by the selling unit belongs to all owners and is not included in the residential sales income. The collection ratio of maintenance funds shall be determined by the real estate administrative departments of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government.