When evaluating a property's value, appraisers note the characteristics of the property and surrounding area, such as a view or noisy highway nearby. They also consider the overall condition of a building, including its foundation and roof or any renovations that may have been done. Appraisers photograph the outside of the building and some of the interior features to document its condition. After visiting the property, the appraiser analyzes the property relative to comparable home sales, including lease records, location, view, previous appraisals, and income potential. During the entire process, appraisers record their research, observations, and methods used in providing an estimate of the property’s value.
Mathematically the distinction between land and improvements in the income approach will have no impact on the overall value when the remaining economic life is more than thirty years. For this reason, it has become quite common to use the Vereinfachtes Ertragswertverfahren (simplified income approach), omitting the land value and the Liegenschaftszins. However, the separate treatment of land and buildings leads to more precise results for older buildings, especially for commercial buildings, which typically have a shorter economic life than residential buildings.