Which department should I find to solve the problem of wall falling off?

If the wall falls off, you should report the problem to the property management office or the building property management Committee where the house is located and seek their help and advice. Generally speaking, property managers or committees will be responsible for maintaining and repairing any damage or safety problems in public areas, including wall falling off.

If you live in an apartment or apartment, you can report the problem to the property management office. They will know the situation and send someone to check and repair any damage.

If you live in a detached house or townhouse, you should contact the local government building department. The government construction department will try to understand the cause of the damage and take necessary measures. This may include suspending the use of housing in case of security or structural problems to ensure the safety of all residents.

In any case, don't ignore the problem of wall falling off. This may lead to greater damage or safety problems, so it is very important to take corresponding measures to repair and solve this problem as soon as possible.