Automated valuation models (AVMs) are growing in acceptance. These rely on statistical models such as multiple regression analysis, machine learning algorithms or geographic information systems (GIS).[17] While AVMs can be quite accurate, particularly when used in a very homogeneous area, there is also evidence that AVMs are not accurate in other instances such as when they are used in rural areas, or when the appraised property does not conform well to the neighborhood.
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Meanwhile, a residential appraiser would focus on those properties where individuals and households are domiciled. This can include condominiums and single homes. Typically a residential appraiser works with properties with no more than four housing units. Larger scale properties, such as multiunit apartment buildings, would likely be classified as a commercial property for the purposes of an appraiser.
Thanks to Jason Taylor for providing an overview of the services provided by the Orange County Emergency Operations Center in the event of disaster in our area to representatives from our Commercial Real Estate team. As many as 80 representatives from government and community organizations can staff this room to work together to meet the needs of the county and its residents. In the aftermath of an incident, appraisers from our office go into the field and assess damage to residential and commercial buildings which is reported to the federal government.  
To qualify, the homestead property must have been uninhabitable for at least 30 days and affected owners must file a sworn application for Abatement of Taxes for Homestead Residential Improvements (DR-463) along with supporting documentation to the Property Appraiser.  If approved, the Property Appraiser will issue an official written statement to the Tax Collector, who will calculate and issue the credit. 
Adjudication of valuer-certified estimates of value in case of the onset of disputes is conducted through the Experts Councils of valuers' SROs. Official courts tend to concur with the resolutions of such Councils. In some rare instances the imprimatur of SRO's Experts Councils is also required for a valuation done by a particular valuer to enter into effect.
For example, single apartment buildings of a given quality tend to sell at a particular price per apartment. In many of those cases, the sales comparison approach may be more applicable. On the other hand, a multiple-building apartment complex would usually be valued by the income approach, as that would follow how most buyers would value it. As another example, single-family houses are most commonly valued with the greatest weighting to the sales comparison approach. However, if a single-family dwelling is in a neighborhood where all or most of the dwellings are rental units, then some variant of the income approach may be more useful. So the choice of valuation method can change depending upon the circumstances, even if the property being valued does not change much.
Federal law requires appraisers to have a state license or certification when working on federally related transactions, such as appraisals for loans made by federally insured banks and financial institutions. The Appraisal Foundation (TAF) offers information on appraisal licensing. There is no such federal requirement for assessors, although some states require certification. For state-specific requirements, applicants should contact their state board.

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