§ 3. Compensation for property of a municipal corporation, school
district or district corporation taken by eminent domain. Where property
of a municipal corporation, school district or district corporation is
taken in the exercise of the power of eminent domain for a purpose
substantially different from that for which it is held by such municipal
corporation, school district or district corporation, just compensation
to the municipal corporation, school district or district corporation
shall be made in the same manner, to the same extent and subject to the
same limitations as though it were private property.