765 ILCS 1005/1b
Whenever a grant or conveyance of lands, tenements, or hereditaments shall be made where the instrument of grant or conveyance does not create an estate in tenancy by the entirety in the manner provided by Section 1c but declares that the estate created be not in tenancy in common but with right of survivorship, or where such instrument of grant or conveyance does not create an estate in tenancy by the entirety in the manner provided by Section 1c but declares that the estate created be not in tenancy in common but in joint tenancy, the estate so created shall be an estate with right of survivorship notwithstanding the fact that the grantor is or the grantors are also named as a grantee or as grantees in said instrument of grant or conveyance. Said estate with right of survivorship, so created, shall have all of the effects of a common law joint tenancy estate.
This section shall not apply to nor operate to change the effect of any grant or conveyance made prior to the effective date of this amendatory Act.
765 ILCS 1005/1b