Any parcel of land owned by a township on which both a township hall and a maintenance building are located and that consists of the entire territory that was annexed by operation of law to a city coterminous with a different township under this Article shall, on September 1, 1988, be disconnected from the city and its coterminous township and reconnected to the township from which it was originally disconnected.
60 ILCS 1/15-40