If you mean the special housing maintenance fund (the original public maintenance fund), then the charge is reasonable and legal.

Article 2 of the Measures for the Administration of Special Maintenance Funds for Residential Buildings proposes that the special maintenance funds for residential buildings mentioned in these Measures refer to the funds earmarked for the maintenance, renewal and transformation of residential buildings and facilities after the expiration of the warranty period. [

Special maintenance funds belong to the state fees, which are paid by the owners at the time of house expropriation.

If the maintenance fee of the real estate fund you mentioned has nothing to do with the special housing maintenance fund, then there are some problems in the collection of this fee. Because there are local policies everywhere, you can't directly say that this fee is illegal, but you can consult the local housing and construction bureau and other housing and construction bureaus; Or consult the price management department, such as the price bureau.