A reduction under subparagraph (A) shall be permanent and made in a manner prescribed by the Secretary. (2) Required action by Secretary (A) In general The Secretary shall proportionately reduce base acres on a farm for land that has been subdivided and developed for multiple residential units or other nonfarming uses if the size of the tracts and the density of the subdivision is such that the land is unlikely to return to the previous agricultural use, unless the producers on the farm demonstrate that the land— (i) remains devoted to commercial agricultural production