The owner of the fifth floor added an outer staircase to the attic without the consent of the owner downstairs. Which department should I call?

1, you can go to the property to reflect and leave evidence (digital photos, recordings, etc.). );

2, you can go to the government real estate management department to reflect;

3, you can go to the relevant departments of the street (Legislative Affairs Office) to reflect and negotiate;

4. You can bring a lawsuit to the people's court of your domicile or mediate before litigation;

5. You can entrust a lawyer to help.

Please refer to the relevant legal documents.