See Miller v. United States , 620 F.2d 812, 831-32 & n.17 (1980). (noting that while some state law cases hold otherwise, “the better rule” applied in federal court holds that “the future availability of other land should be considered as the hypothetical ‘willing buyer’ of the [remainder] would consider such a factor”) (citing Porrata , 158 F.2d 788).