Key facts: Illinois small estate threshold is $100,000 for real property only under 755 ILCS 5/25-1; mandatory 30-day waiting period applies from date of death before transfer can occur; heirs take inherited property subject to all valid tax liens; unpaid property taxes can result in tax sale proceedings; federal tax liens attach to property at the time of filing regardless of heir's personal liability; county treasurers may enter installment agreements for delinquent property taxes.