Combined, it'll be a 30 acre parcel.
Not quite getting the math as the total site will be 30 acres , $1850 an acre $54,000....not sure what "22k in" for the shell means...that is what you think the house is worth as contributory value? I assume if they are purchasing there is one price for the total, the house and both parcels in a sales contract ?
.if you had to go 40 miles to bracket the site with a similar quality home because the properties around the subject are ranches or commercial operations, it might be possible the HBU of subject due to its acreage size is a ranch or commercial operation? Or maybe in your area there are other homes on such large parcels but if so why go out 40 miles to find one..
Prices sure are reasonable there !