The better way to handle these situations is to send the 3-Day Notice to someone you know near the tenants and have it hand delivered or posted on the premises. When you mail the 3-Day Notice, Florida Law requires that you add 5 more days to the time period before it is considered served. Your pay/vacate date falls 1 day short of the cummulative time period. Therefore, you most likely have a defective notice anyway. Furthermore, Florida Law is specific on the minimum language that needs to be in the Notice. A proper 3-Day Notice is a requirement in order to evict a residential tenant. Unless you have designated late fees as "rent" in your lease, the only amounts you can demand is rent in the 3-Day Notice. This does not mean you can't go after late fees in the complaint. Florida Law just states that the 3-Day Notice is for "rent" due by the tenant. My advice is to just hire a local attorney in the Kissimmee area to have this done properly. They can make sure the notice is proper and hand delivered to the premises. This way, you avoid the extra days by mailing a notice.