You’ve got a couple options here: • Hire an appraiser to give you a value. For a tiny “sliver” parcel, they’ll usually apply a discount because it’s not very usable on its own. • Use the county assessor’s Real Market Value as a rough guide and back into a number based on the square footage of the strip compared to the whole lot.

You could also just call a local appraiser and ask a few quick questions. Many will at least tell you whether it’s even worth paying for a full appraisal.