An Illinois Vacancy Affidavit is a sworn statement that is used to determine if a property has been left vacant and unoccupied for a period of time. The affidavit is used to document the fact that the property is vacant and not currently occupied by a tenant. There are two types of Illinois Vacancy Affidavits: a Vacant Affidavit and an Unoccupied Affidavit. The Vacant Affidavit is used to verify that the property has been left vacant and unoccupied for at least six months. This affidavit is usually completed by the landlord or property owner, and must include information about the property, such as the address, the date the property was vacated, and the name of the last tenant. The Unoccupied Affidavit is used to verify that the property has been left vacant and unoccupied for at least one year. This affidavit is usually completed by the landlord or property owner, and must include information about the property, such as the address, the date the property was vacated, and the name of the last tenant. In addition, the affidavit must include a statement from a licensed inspector that verifies the property has been unoccupied for at least one year. Both types of Illinois Vacancy Affidavits are used to document the fact that a property has been left vacant and unoccupied for a period of time, and are required in order for the property to be sold or transferred in the state of Illinois.