(1) In determining the total area of land actively devoted to agricultural use, there is included the area of all land under barns, sheds, silos, cribs, greenhouses, and like structures, lakes, dams, ponds, streams, irrigation ditches, and like facilities.
(2) One acre of land beneath residential improvements on agricultural land, as described in 15-7-202 (1)(c)(ii), is valued at the class with the highest productive value and production capacity of agricultural land.