legal ground
"Measures for the administration of residential special maintenance funds" twentieth.
The cost of maintenance, renovation and transformation of residential parts and facilities shall be shared in accordance with the following provisions:
(1) The maintenance, renewal and renovation costs of * * * parts and * * * facilities and equipment between commercial houses or between commercial houses and non-residential houses shall be shared by the relevant owners in proportion to the construction area of their respective properties.
(II) After-sale public housing, the cost of maintenance, renewal and transformation of * * * parts and * * * facilities and equipment shall be shared by the relevant owners and public housing selling units according to the proportion of the residential special maintenance funds deposited; Among them, the part that should be borne by the owners shall be shared by the relevant owners in proportion to the construction area of their respective properties.