Where an area of land, by reason of it being contiguous,
(a) constitutes or becomes a portion of an approved estate, town or an extension of any approved estate or town, or
(b) adjoins an approved estate or town or an approved extension of an estate or town, the District Assembly may, by a certificate to the Director of Survey and Mapping Division of the Lands Commission, extend the boundaries of the estate or town or extension of the estate or town to include that area.