Abstract: A subject property and a corresponding updatable pool of property sales are displayed in a map image. Property characteristics that define the pool of recent sales are manipulated using an interface that lists the characteristics and provides updatable ranges. Once a satisfactory set of ranges is established, the corresponding sub-market for the subject property is recalculated using only those properties that satisfy the new property characteristics criteria. A map image automatically updates to show those properties included in the updated pool, and those that were excluded. A model-based valuation also automatically updates and is listed among property data for the subject property.