If your tenant has moved out for certain and left someone else in the unit without asking you for consent to assign or sublet the unit, that person is considered an unauthorized occupant. If this is the case then you will have to file an application with the Landlord and Tenant Board to evict the unauthorized occupant. The application you need to file is a Form A2 – Application About a Sublet or an Assignment. This application MUST be filed within 60 days of discovering the unauthorized occupant. The Board will schedule a hearing and issue a decision to evict whoever is living there.