Key facts: Illinois small estate threshold is $100,000 gross estate value under 755 ILCS 5/25-1; mandatory 30-day waiting period from date of death before affidavit can be executed; affidavit must be sworn and signed by entitled heirs; property valued at fair market value as of date of death; existing mortgages and liens remain obligations of the heir; document must be recorded with county recorder of deeds where property is located.