An L.I.D. may include adjoining, vicinal or neighboring streets, avenues and alleys even though the improvements thus made are not connected or continuous as long as there is no more than 2,500 feet between continuous units; provided, that the cost and expense of each continuous unit of the improvement may be ascertained separately as near as may be, and if so ascertained separately the assessment rates shall be computed on the basis of the cost and expense of each unit.
(S.C.C. 3-9-12; S.G.C. 17.16.010)