A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. Your letter of resignation should be short and professional.Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. File Statutory Agent Update Online at Ohio Business Central (Agent Resignation Only)(opens in a new window) The employee must submit a written resignation letter to the Superintendent no later than the last business day of October of the contract year of retirement. Secretary will fill out a rental form for the customer. Signed the resignation letter. 7. Def. Ex. 1 pages 111-119. It is a located on Lansing Ave.