How to lease a house
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In a firm yet amicable tone, ask the guest to leave your home by a certain date. In picking a date, give the guest a few days to make other arrangements, but make it perfectly clear that no extension is possible past that date. Provide the person with leads for finding his or her own place. If this is a close friend or family member, consider offering a small amount of money to help him of her get settled in a temporary location.
Wait until the move-out date and refuse any requests from the guest to stay longer. It's important to stand firmly by your initial request—no extensions. Remind the person early on the requested move-out date that he or she must leave by the end of day.
Call the police
immediately if the guest doesn’t leave on his or her own accord by the end of day, disregards your request, or gets belligerent about the situation. There's no need to tell the guest that you're making this call—do what you can to avoid conflicts until the police arrive to mediate the situation. Explain the circumstances to the officers and ask them to escort the guest off of the premises. In most cases, a guest doesn't have a legal right to remain in your home without your consent, as a tenant would, so formal eviction proceedings are not necessary.
Change the locks and the password on your alarm system, if you're concerned about the person returning at a later date. Make sure you get a formal report from the police department in case of future issues with the guest.Source: ehow.com