The assumption doing the most work in the operator's position is that buyers will price walnut acreage off comparable sales rather than off a discounted cash flow tied to current and projected nut or oil revenue. In a functioning market those two methods converge. When commodity prices move sharply and comps are stale, they diverge, and the question is which one an arms-length buyer would actually use today.
Appraisers in permanent-crop markets have a documented lag problem. USPAP-compliant agricultural appraisals rely heavily on recent comparable sales, and if no one is transacting, the appraiser has little choice but to anchor on 2022 or 2023 data even when the income approach would tell a different story. That is not bad faith, it is a methodology constraint. But it does mean the appraisal could be technically defensible while still reflecting a market that no longer exists for walnut ground at those prices.
The risk you have not named here is refinance or exit timing. If the operator needs to refinance within the next 18 to 24 months and the lender orders a fresh appraisal, the gap between comp-based value and income-supported value becomes a lender's problem fast. A walnut grove appraised at X using 2022 comps but generating income that supports 0.75X is a loan-to-value problem waiting to surface. Confirm with your own counsel or a licensed agricultural appraiser what the current income approach would yield on that acreage at today's walnut oil prices before any refinance event is on the table.
The question I would put back to the operator is: what is their current per-pound revenue assumption in the pro forma, and which buyer pool are they pricing the exit for, an owner-operator or a passive land investor? Those two buyer types discount the income stream differently, and the answer changes your view of whether the comp-based value is defensible or just convenient.
