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According to your schematic diagram, although the billboard is installed under your window, the wall installed on it has nothing to do with your house.

Therefore, if the following situations do not occur, even if you hire a lawyer, it will be difficult to win the lawsuit.

1, billboards block and block your window;

2. The lighting of billboards causes light pollution to your home;

The installation of billboard damaged the exterior wall of your house.

4. The installation of billboards will cause dangerous factors to your home safety (outsiders can climb billboards to enter your home).

In case of the above situation, you can bring a lawsuit to the court and ask for demolition.