Is it legal for the urban management to take the billboard without my knowledge?

Urban management took the billboard without the knowledge of the parties. If billboards are illegally set up, then the behavior of urban management personnel is legal.

According to the Regulations on the Administration of City Appearance and Environmental Sanitation

Eleventh outdoor advertisements, placards, galleries, windows, etc. It should be located in a city with healthy content and beautiful appearance, and should be regularly maintained, decorated or demolished.

The establishment of large-scale outdoor advertisements must obtain the consent of the administrative department of city appearance and environmental sanitation of the people's government of the city, and go through the examination and approval procedures in accordance with the relevant provisions.

Thirty-sixth one of the following acts, by the city people's government administrative department of city appearance and environmental sanitation or its entrusted units shall be ordered to stop the illegal behavior, a deadline to clean up, dismantle or take other remedial measures, and may impose a fine:

(a) without the consent of the administrative department of city appearance and environmental sanitation of the city people's government, setting up large-scale outdoor advertisements without authorization, which affects the city appearance;

(two) without the approval of the administrative department of city appearance and environmental sanitation of the people's Government of the city, stacking materials on both sides of the street and public places without authorization, and erecting buildings, structures or other facilities, which will affect the city appearance;

(3) Dismantling environmental sanitation facilities without approval or failing to carry out demolition according to the approved demolition plan.