Okay, so I take it that you mean that the language in your contract with the agent states that they have to do an inspection every year.
To sue in a state court, one needs to have a "cause of action." There are numerous causes of action, such as "breach of contract," "negligence," "fraud," "unjust enrichment," etc., as well as causes of action rooted in statutory law. Every state has their own although they are very similar to each other in every state because they all stem from the same common law. A pleading in Court needs at least one cause of action, although it is not unusual to have more than one.
If so, then there may be a case here since the tenancy is still ongoing, to sue one's agent for negligence for failure to notify the owner (i.e. you) of the damage in a reasonable amount of time. Negligence is defined by the following elements: (1) the defendant owed the plaintiff a duty of care, (2) the defendant breached the standard by which his or her duty is measured, and (3) consequent injury. Mullins v. Commonwealth Life Insurance Co., Ky., 839 S.W.2d 245, 247 (1992), citing Illinois Central R.R. v. Vincent, Ky., 412 S.W.2d 874, 876 (1967).
However, this is a subjective case. The Court will have to decide whether or not the agent was negligent in failing to mention the damage. If the agent did not even DO the inspection every year, then this makes the case stronger.
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