Market value changes occur in many forms. Buyers have different requirements and these requirements sometimes change from year to year. Also, sometimes renovations have been performed on a property that would cause a change in assessed value different from a similar property that did not have renovations. A recent inspection by the assessor's office also may have contributed to a change in assessed value. Perhaps the property had not been inspected in several years and the property information has now been updated to more accurately reflect the condition of the property. Historical trends are just historical information. Properties change over time, as do market values. Just because a property was assessed less than a neighboring property in 1973 does not mean the property will always be assessed less than the neighboring property. Renovations, additions, disrepair, fire, and other factors can also change historical relationships.