There are several issues here. First, the policy may have a one year limitations clause. The one year will likely run from the decision denying coverage. Was the insurance agent a State Farm captive agent, or an independent agent. If the agent knew what kind of coverage you needed, because he was familiar with the property, you may be able to prove he was negligent in securing the wrong coverage. If the agent was State Farm's agent, you may able to bind State Farm to the coverage. if the agent was an independent agent, you may have a claim against that person for securing the wrong coverage. You should seek out an insurance attorney in the area to discuss your options more fully.