Highest and best use - usa - appraisal - This is the probable, reasonable and legal use of an improved property or vacant land that is physically possible, appropriately supported, financially feasible, and that results in the highest and best use. There is four criteria that the highest and best use must meet which are legally permissibility, physical possibility, financial feasibility, and maximu productivity. Alternatively, it can mean the probable use of improved or vacant land specific with respect to the user and timing of the use, that is adequately supported and results in the highest and best value.