1.5.1. Land Valuation. When the subject property is unimproved or the cost approach is being used, the primary method of land valuation is the sales comparison approach as described below. The subdivision development method and the capitalization of ground leases are to be used only in rare cases when the property has a highest and best use for subdivision development or the property is subject to a long-term ground lease. Even when those situations exist, the latter two methods are better used as additional support for the sales comparison approach.