Principle of Conformity - Progression, Regression (Principe de conformité - progression, régression)

In the appraisal of Real Estate the principle of Conformity states that the value of a group of properties will rise to its highest possible level in an area where architectural styles are reasonably homogeneous and surrounding land uses are compatible with the use of the specified properties. It also states (principle of Progression) that the worth of an inferior property is increased by its proximity to better properties of the same use class vice-versa (principle of Regression).