Legal analysis: After the sale of public housing, the selling unit must withdraw 20%-30% of the sale price as a unit maintenance fund, which is stored in a special account and used under the supervision of the Municipal Housing Security and Real Estate Administration Bureau, specifically for housing maintenance.

Repair, maintenance and update of parts, public equipment and public facilities.

For public housing sold by the unit, any repairs involved after the unit maintenance fund is used up shall be borne by the individual.

For the remaining public property, the ownership unit must continue to draw depreciation fees and major repair funds.

Legal basis: "Urban Housing Ownership Registration and Management Measures" Article 24 Due to the loss of the house, expiration of the land use period, termination of other rights, etc., the right holder shall apply for deregistration within 30 days from the date of the fact.

To apply for cancellation of registration, the obligee shall submit the original house ownership certificate, other rights certificates, relevant contracts, agreements, certificates and other documents.