2. If the other party does not agree to remove the billboard, you may consider seeking legal means to resolve the problem. According to relevant laws and regulations, the owners' rights to ventilation and lighting are protected. Even if the billboard has been approved, it cannot infringe on these rights of the owners.
3. Before taking legal action, you need to understand the local regulations on the size and dimensions of billboards, which will help you provide the necessary evidence in legal proceedings.