Implied in the definition of market value is the consummation of a sale. No
HC is required.
I too wonder how the county actually enforces this. Is it a legal encumbrance on the title? If it’s on the title, I would say it’s not your problem, similar to a lien or other financial encumbrance.
If it is not on the title, not all ordinances are enforceable. If the intent is to avoid unlicensed builders from building multiple homes, could they provide a variance so as not to impose a financial burden?
If this loan is for the secondary market, your client isn’t going to want the appraisal based on this hypothetical condition, so I would alert them if that is your intent. If that’s the case I’m sure they’ll want a second opinion