765 ILCS 420/2
As used in this Act:
"Beneficial interest" means any interest, regardless of how small or minimal such interest may be, in a land trust, held by a trustee for the benefit of beneficiaries of such land trust.
"Land trust" means any express agreement or arrangement whereby a use, confidence or trust is declared of any land, or of any charge upon land, for the use or benefit of any beneficiary, under which the legal title to real property is held by a trustee, which may be enforced by the beneficiaries who have the exclusive right to manage and control the real estate, to have the possession thereof, to receive the net proceeds from the rental, sale, hypothecation or other disposition thereof, and under which the interest of the beneficiary is personal property only.
765 ILCS 420/2