Thank you all for the responses. Not sure this will ever move beyond the thinking, talking stage but this certainly helps focus the thought process.
The course definitely has maintenance/restoration issues as 65 bunkers would need to be redone and the entire course regrassed. I'd also assume the worst on equipment and the irrigation system as I wouldn't want the risk of a failed irrigation afterv regrassing.
I'm not sure how applicable the formulas are in that the property is underutilized though substantial investment would be needed to bring out the full potential.
To what extent can undeveloped land of similar location and size be used to place a value on the property?
A quick search of similarly sized vacant land in the area shows values ranging from $12,500 to $25,000 per acre and some in areas with nearby commercial development quite a bit more. As I understand it 1/3 acre developed lots in the area are going for $80,000 but imagine the development market is quite weak at the moment.