The boundaries of a development zone may be reduced or enlarged in the manner provided by this subchapter for creation of a zone, except that the boundaries may not be reduced to less than 25 contiguous acres. A development zone may be enlarged to include noncontiguous tracts only if on the date the zone is enlarged the zone contains at least one tract consisting of at least 25 contiguous acres. A confirmation election is not required for an enlargement if:
(1) all landowners of the area proposed to be added consent to the enlargement and the tax authorization in the zone; and
(2) the enlarged area does not have any registered voters who reside in the area.