(1)  The Commissioner may make a determination that, for the purposes of section 30 , land is, or will be, capable of being lawfully used primarily for primary production purposes if the Commissioner is satisfied, on reasonable grounds, that at least 50% of the land is, or will be, capable of being used for such a purpose, whether or not the land is, or will be, capable of use for another purpose.

(2)  The Commissioner may make a determination that, for the purposes of section 30A , land is, or will be, capable of being lawfully used primarily for residential purposes if the Commissioner is satisfied, on reasonable grounds, that at least 50% of the land is, or will be, capable of being used for such a purpose, whether or not the land is, or will be, capable of use for another purpose.