In Ohio, you are required to have a dedicated office to sell cars. You must own or rent an office that has at least 180 square feet. It also has to have a desk, 3 chairs, and 1 filing cabinet. You're also required to have a working landline or a cellular phone that is registered in your business's name. You also need to rent or own at least 3500 square feet of parking, but it doesn't have to be a stereotypical lot. You also have to have a permanent business sign with letters that are at least 6 inches in length, but it doesn't need to be a permanent sign.