Real estate appraisal

Real estate appraisal, property valuation or land valuation is the practice of developing an opinion of the value of real property, usually its Market Value. The need for appraisals arises from the heterogeneous nature of property as an investment class: no two properties are identical, and all properties differ from each other in their location - which is one of the most important determinants of their value. So there cannot exist a centralised Walrasian auction setting for the trading of property assets, as there exists for trade in corporate stock. The absence of a market-based pricing mechanism determines the need for an expert appraisal/valuation of real estate/property.
Although some areas require no license or certification at all, a real estate appraisal is generally performed by a licensed or certified appraiser (in many countries known as a Property Valuer or Land Valuer and in British English as a "valuation surveyor"). If the appraiser's opinion is based on Market Value, then it must also be based on the Highest and Best Use of the real property. For mortgage valuations of improved residential property in the US, the appraisal is most often reported on a standardized form, such as the Uniform Residential Appraisal Report. Appraisals of more complex property (e.g. -- income producing, raw land) are usually reported in a narrative appraisal report.

It is important to distinguish between Market Value and Price. A price obtained for a specific property under a specific transaction may or may not represent that property's market value: special considerations may have been present, such as a special relationship between the buyer and the seller, or else the transaction may have been part of a larger set of transactions in which the parties had engaged. Another possibility is that a special buyer may have been willing to pay a premium over and above the market value, if his subjective valuation of the property (its investment value for him) was higher than the Market Value. An example of this would be the owner of a neighbouring property who, by combining his own property with the subject property, could thereby obtain economies-of-scale. Such situations often arise in corporate finance, as for example when a merger or acquisition is concluded at a price which is higher than the value represented by the price of the underlying stock. The usual rationale for these valuations would be that the 'sum is greater than its parts', since full ownership of a company entails special privileges for which a potential purchaser would be willing to pay. Such situations arise in real estate/property markets as well. It is the task of the real estate appraiser/property valuer to judge whether a specific price obtained under a specific transaction is indicative of Market Value.

In the US, appraisals are performed to a certain standard of value (e.g. -- foreclosure value, fair market value, distressed sale value, investment value). The most commonly used definition of value is Market Value. While USPAP does not define Market Value, it provides general guidance for how Market Value should be defined:
a type of value, stated as an opinion, that presumes the transfer or sale of a property as of a certain date, under specific conditions set forth in the definition of the term identified by the appraiser as applicable in an appraisal.
Thus, the definition of value used in an appraisal or CMA analysis and report is a set of assumptions about the market in which the subject property may transact. It becomes the basis for selecting comparable data for use in the analysis. These assumptions will vary from definition to definition but generally fall into three categories:

There are three general groups of methodologies for determining value. These are usually referred to as the "three approaches to value":
The cost approach
The sales comparison approach and
The income approach
However, the recent trend of the business tends to be clining to the scientific methodology of appraisal which lies on the foundation of quantitative-data, risk and geographical based approaches .Pagourtzi et al. have provided a review on the methods used in the industry by comparison between conventional approaches and advanced ones .
The appraiser using three approaches will determine which one or more of these approaches may be applicable, based on the scope of work determination, and from that develop an appraisal analysis. Costs, income, and sales vary widely from one situation to the next, and particular importance is given to the specific characteristics of the subject.
Consideration is also given to the market for the property appraised. Appraisals of properties that are typically purchased by investors (e.g. - skyscrapers) may give greater weight to the income approach, while small retail or office properties, often purchased by owner-users, may give greater weighting to the sales comparison approach. While this may seem simple, it is not always obvious. For example, apartment complexes of a given quality tend to sell at a price per apartment, and as such the sales comparison approach may be more applicable. Single family residences are most commonly valued with greatest weighting to the sales comparison approach, but 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.

The cost approach was formerly called the summation approach. The theory is that the value of a property can be estimated by summing the land value and the depreciated value of any improvements. The value of the improvements is often referred to by the abbreviation RCNLD (reproduction cost new less depreciation or replacement cost new less depreciation). Reproduction refers to reproducing an exact replica. Replacement cost refers to the cost of building a house or other improvement which has the same utility, but using modern design, workmanship and materials. In practice, appraisers use replacement cost and then deduct a factor for any functional disutility associated with the age of the subject property.
In most instances when the cost approach is involved, the overall methodology is a hybrid of the cost and sales comparison approaches. For example, while the replacement cost to construct a building can be determined by adding the labor, material, and other costs, land values and depreciation must be derived from an analysis of comparable data.
The cost approach is considered reliable when used on newer structures, but the method tends to become less reliable for older properties. The cost approach is often the only reliable approach when dealing with special use properties (e.g. -- public assembly, marinas).

The Comparitive Market Analysis (CMA) examines the price or price per unit/SF area of similar properties being sold in the marketplace. * Similar properties are of similar square footage, number of levels, age of the home, condition of the home, and area proximity of the subject home. Simply put, the sales of properties similar to the subject are analyzed and the sale prices adjusted to account for differences in the comparables to the subject to determine the value of the subject. This approach is generally considered the most reliable if adequate comparable sales exist. In any event, it is the only independent check on the reasonability of an appraisal opinion. Comparables used by appraisers are considered "worthy" or able to be used by the appraiser if they were sold within the last 12 months of the appraisal date of the subject property. Some appraiser are allowed sales only witin 6 months of the subject property. This differs with each company that is hired to appraise the subject property.
The above information holds true also when a Professional Licensed Real Estate Agent prepares a CMA ( comparitive market analysis) on the subject property.
When initially preparing a CMA, an agent will search back 12 months from the day of CMA preparation. Keep in mind, that when the subject home agrees to terms between buyer and seller or gets an "accepted offer", the lender of the BUYER will order the "Appraisal". Some comps that were originally used may not be "worthy comps" depending on the date the comparable was sold. Again, comps are worthy witin 12 months of the appraisal date of the subject property...........