The Assessor generally uses three approaches, Market Approach, Cost Approach, and Income Approach.
Market approach is to find properties that are comparable to yours which have sold recently. Local conditions peculiar to your property are taken into consideration. The assessor also uses sales ratio studies to determine the general level of assessment in a community, in order to adjust for local conditions.
Cost approach is an estimate of how many dollars at current labor and material prices it would take to replace your property with one similar to it. In the event improvement is not new appropriate amounts for depreciation and obsolescence would be deducted from replacement value. Value of the land then would be added to arrive at the total estimate of value.
Income approach is used if your property produces income such as an apartment or office building. In that case, your property could be valued according to its ability to produce income under prudent management; in other words, what another investor would give for a property in order to gain its income. The income approach is the most complex of the three approaches because of the research, information and analysis necessary for an accurate estimate of value. This method requires thorough knowledge of local and national financial conditions, as well as any developmental trends in the area of the subject property being appraised since errors or inaccurate information can seriously effect the final estimate of value.