Person in charge is said to be out on indefinite medical leave and I must wait until she returns to get a check made out to me. The park already collected their $300 transfer fee from the buyer.
Make a written demand (letter) giving them a reasonable time to make payment to you (2 weeks). Although the employee's illness is unfortunate, business continues and the park needs to have procedures in place to account for illnesses of its employees. If they do not make payment in the specified time period, file a small claims suit to collect the money. If you do not want to do that, then your only other recourse is to wait.