Xiamen residents' roof expansion joints have been leaking for a long time. Which department should we complain about?

You can complain to the Property Office of the Municipal Construction Bureau, or to the Property Management Center of the District Construction Bureau, or to the neighborhood committees and the media.

The question is why the property is not repaired. We should know that sometimes the property can't be repaired if it wants to, because there is no money (no public maintenance fund or insufficient public maintenance fund), or there is no industry committee if there is money (public maintenance fund), and the residents are unwilling to sign the maintenance signature form, so the property can't be repaired even if they want to. If there is no problem between the two and the property does not act, that is the responsibility of the property.