2.4.3. Highest and Best Use and Larger Parcel.The appraiser must describe the factual basis and analysis concerning the highest and best use of the building in which the government’s leasehold is located, including those situations in which the leasehold is the entire building. This analysis is critical in determining the position of the building within the market. This analysis is critical in situations where the property is located in a market in transition. The appraiser must also present the larger parcel analysis developed under Section 1.8. The result of this analysis will dictate whether a before and after valuation must be performed.