[bert]

The law regulates fences and says nothing about walls.

[Responsibility2nd]

Whether it’s a wall or a fence, it is probably unstable and should probably come down. One aspect of the story not yet mentioned is that the city is way out of bounds in threatening to cut off water and electricity because of this issue.

[lastchance]

It would come under the adopted state or local building code since it would be defined as a structure.