Someone is building a house on the roof where we live, regardless of the property, and I don't know who did it. What should I do?

First of all, it is determined that the roof is a public part, and the right belongs to the owner of the whole building, not to any one or two families (including the top-level residents \ owners).

1\ Notify the property. If it is really an illegal building, the property will issue a rectification notice. Note: the authority of the property is limited, and it cannot be forcibly removed, because the property has no law enforcement power.

2\ If the property does not issue a rectification notice or the person who built the illegal building refuses to rectify, directly find the urban management department of the local street or the street office under the Real Estate Bureau. They have the right to enforce the law.

3\ If these two departments do not act, they will directly bring a lawsuit to the court, demanding that the person who built the illegal building stop the infringement and restore the original state. If the building is really illegal, the court will support you. If the restitution is refused, it should be enforced by the court.

4\ If you can't do it again, find the news media to expose it and create pressure on public opinion.