In a residential area without property management, which department should I find if the top floor leaks?

During the warranty period, the property has the responsibility to coordinate with the developer. The fact of water seepage (photos, warranty records, etc.) outside the warranty period. ) is required. Because the roof is used by all residents of the building, and the maintenance of water seepage requires maintenance funds. If there is an industry committee, the industry committee will handle it, report to the Housing Authority and apply for maintenance funds from the maintenance fund management center.