755 ILCS 5/23-4
If it appears to the court in which a ward's estate is being administered that the interests of the ward are best served by the transfer of the administration of the ward's estate to another county in this State by reason of the residence of the ward or of the representative or of the location of the major portion of the ward's property in that county, the court may enter an order in the estate transferring the administration of the estate to the court of that county. Upon the filing of authenticated copies of the order of transfer and of all documents filed and all orders entered in the court from which the transfer is made and the qualifying by the representative in the court to which the transfer is made, that court shall enter the estate upon its docket, issue letters of office and direct the administration of the estate as if letters of office had originally issued from that court. Upon the filing of an authenticated copy of the letters in the court from which the transfer is made, the letters issued by that court shall be revoked. The representative shall file in the court to which the transfer is made authenticated copies of his final account and all orders in connection therewith entered in the court from which the transfer is made. Authenticated copies of documents and orders of the court from which the transfer is made have the same force and effect as if the documents were filed or the orders entered in the court to which the transfer is made.
755 ILCS 5/23-4