Legal analysis: when buying and selling commercial housing, the buyer and the seller should sign a maintenance fund payment agreement. Property buyers should pay the housing 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 current deposit standards of the first special maintenance fund are: 90 yuan per square meter for high-rise buildings (including multi-storey buildings with elevators) and 50 yuan per square meter for multi-storey buildings (including villas).

Legal basis: Article 6 of the Measures for the Administration of Residential Special Maintenance Funds The owners of the following properties shall deposit residential special maintenance funds in accordance with the provisions of these Measures:

(a) residence, except that it is jointly owned by the owners and does not use parts and facilities with other properties;

(2) Non-residential buildings in residential quarters or non-residential buildings connected with single residential structures outside residential quarters.

If the property listed in the preceding paragraph belongs to the sale of public housing, the selling unit shall deposit special housing maintenance funds in accordance with the provisions of these measures.