It's not a lightning rod, it's a lightning belt. It forms a closed circle around the exterior of the building and is connected with the earth. It's all buried in the outer wall. I don't know why you tore down all the external walls of the seventh floor. Why? Install a private elevator? If the outer wall is really demolished, lightning protection will have an impact.

There is no lightning protection zone on the inner wall (not the outer wall) of the house. Does your mother know lightning protection and grounding? Where did she learn that there was a lightning rod in the wall?

There is only one grounding junction box in the bathroom.