Occupy the roof of the building and complain to which department?

Legal analysis: you can complain to the property company, housing authority or construction bureau.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 274 Roads within a building division belong to the owner, except those belonging to urban roads. The green space within the building division belongs to the owner, except for urban public green space or express personal green space. Other public places, public facilities and property services within the building division are owned by the owner.

Article 119 Operators, managers or organizers of mass activities in hotels, shopping malls, banks, railway stations, airports, stadiums, entertainment places and other business places shall bear tort liability if they fail to fulfill their security obligations and cause damage to others. If the behavior of a third party causes damage to others, the third party shall bear the tort liability; Operators, managers or organizers who fail to fulfill their security obligations shall bear corresponding supplementary responsibilities. Operators, managers or organizers may claim compensation from a third party after assuming supplementary responsibilities.