Tax Court Valuation Cases Put Highest and Best Use in the Spotlight
Recent Cases Point to a Recurring Judicial Focus
In Ranch Springs, LLC v. Commissioner, the Tax Court evaluated a tract of vacant land purchased for roughly $715,000 and valued at more than $25.8 million about a year later. The court noted that the taxpayer had not filed a rezoning application or taken meaningful steps toward quarry approvals, but the larger problem was the appraisal’s treatment of raw land as if it were an operating limestone business. The court rejected the owner-operator income approach as “wholly illogical and erroneous as a matter of law” because it equated the value of property rights with the projected value of a hypothetical business enterprise.
That distinction matters. Conservation easement valuation focuses on the fair market value of the real property interests conveyed and retained. When an appraisal assumes a future quarry, mine, subdivision, or other alternative use, courts may look for support beyond physical adaptability, including evidence related to legal permissibility, physical possibility, financial feasibility, market demand, and a realistic path from the property’s current condition to the asserted highest and best use.
Highest and Best Use and “Reasonably Probable”
The Appraisal Institute’s Body of Knowledge, including The Appraisal of Real Estate, has long recognized that a property’s highest and best use may differ from its current legal use when a zoning change, permit, variance, or other governmental approval is reasonably probable. That concept does not require certainty, nor does it assume every approval has already been secured. Instead, it asks whether knowledgeable market participants, as of the appraisal’s effective date, would reasonably anticipate the change and reflect that potential in the price they would pay.
Because this issue is now arising in tax litigation, the legal backdrop is also relevant. The “reasonably probable” concept in valuation has roots in eminent domain law. In Olson v. United States, the Supreme Court warned against allowing “mere speculation and conjecture” to guide value and excluded elements that depend on events that are possible but not fairly shown to be reasonably probable. In this context, the standard functions as an evidentiary guardrail against speculation; courts generally have not treated it as a strict mathematical threshold requiring proof of more than 50% odds.
That distinction matters when reading recent conservation easement cases. Decisions such as Ranch Springs, LLC v. Commissioner, North Donald LA Property, LLC v. Commissioner, Rising Rock Partners, LLC v. Commissioner, Excelsior Aggregates, LLC v. Commissioner, Jackson Stone South, LLC v. Commissioner, Piton Holdings, LLC v. Commissioner, and Savannah Shoals, LLC v. Commissioner show courts scrutinizing HBU opinions that depend on rezoning, mineral extraction, or future demand. But they should not be read as creating a universal rule that a rezoning application must always have been filed. The better reading is that each judge will examine the evidence and decide whether the asserted use rises above possibility or conjecture.
A useful counterpoint is Townley v. United States, a federal tax refund case involving Georgia granite-mining easements. There, the IRS sought summary judgment on the zoning issue, asking the court to rule that the claimed mining HBU failed as a matter of law because no rezoning application had been filed. That position would appear difficult to reconcile with the Appraisal Institute Body of Knowledge’s treatment of reasonable probability as a fact-specific market question rather than a bright-line procedural requirement. The court declined to resolve the issue against the taxpayers at summary judgment. The taxpayers offered evidence that a conditional use permit would be needed, nearby comparable active mines existed, and a local development authority chairperson had not indicated opposition. Citing Palmer Ranch Holdings v. Commissioner, the court concluded that a reasonable jury could find the needed zoning variance reasonably probable. Read in that procedural context, Townley illustrates that “reasonably probable” is not necessarily defeated by the absence of a filed application, although it still requires evidence beyond speculation.
The “100% Certainty” Assumption vs. Market Reality
Even if a zoning change or permit is reasonably probable, recent decisions suggest courts may question a valuation that treats the approval as though it were already a 100% certainty on the effective date. Recognized methods and techniques typically account for the risks, timing, costs, and uncertainty involved in obtaining the entitlement. A knowledgeable buyer generally would not pay the full “as-approved” value for land that still requires rezoning, permits, studies, community acceptance, financing, or time.
That is one reason Ranch Springs may be notable for appraisers. The problem was not merely that the taxpayer had not filed a rezoning application. The court also rejected an appraisal that effectively valued agricultural land as an active, fully permitted limestone business. When an HBU relies on a future approval, the valuation analysis may need to reflect market reality through appropriate risk adjustments, entitlement timing, holding costs, and a clear distinction between real property value and the value of a hypothetical operating business.
Core Takeaway
The recent cases should not be read as a panic over zoning paperwork or as a bright-line “filed application” requirement. They are better understood as a reminder that courts may examine whether the asserted highest and best use is persuasive, market-based, and tied to the property being appraised. The analysis generally turns on why the asserted use was reasonably probable as of the effective date and how the market would price the opportunity, the risk, and the time required to achieve it.
For members, these decisions may be useful to review in connection with how conservation easement appraisals explain the evidence behind any “reasonably probable” use. Reports that clearly show what was known on the effective date, what market participants would likely have considered, why the asserted use was more than speculative, and how the valuation reflects both opportunity and risk may be better positioned to address the types of questions courts have raised in these cases.
Source note: This article draws on recent federal tax cases involving conservation easement valuations and highest and best use analysis, including Ranch Springs, LLC v. Commissioner, Townley v. United States, and related decisions. The discussion of “reasonably probable” highest and best use reflects appraisal practice as described in the Appraisal Institute Body of Knowledge, including The Appraisal of Real Estate, and relevant judicial treatment of speculative versus market-supported uses.