E.g., United States ex rel. Tenn. Valley Auth. v. 1.72 Acres of Land , 821 F.3d 742, 753-54 (6th Cir. 2016); Piza-Blondet , 585 F.3d at 8; see United States v. 62.50 Acres of Land in Jefferson Par. , 953 F.2d 886, 888-93 (5th Cir. 1992); see also H & R Corp. , 351 F.2d at 742-43 (“[A] witness’ bare assertion that zoning change was probable [does not allow the probability of a change in zoning to be considered]. His opinion must have some foundation in fact.”).