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Mathematically the distinction between land and improvements in the income approach will have no impact on the overall value when the remaining economic life is more than thirty years. For this reason, it has become quite common to use the Vereinfachtes Ertragswertverfahren (simplified income approach), omitting the land value and the Liegenschaftszins. However, the separate treatment of land and buildings leads to more precise results for older buildings, especially for commercial buildings, which typically have a shorter economic life than residential buildings.
In addition, there are professional appraisal organizations, organized as private non-profit organizations that date to the Great Depression of the 1930s. One of the oldest in the United States is the American Society of Farm Managers and Rural Appraisers (ASFMRA), which was founded in 1929. Others were founded as needed and the opportunity arose in specialized fields, such as the Appraisal Institute (AI) and the American Society of Appraisers (ASA) founded in the 1930s, the International Right of Way Association and the National Association of Realtors which were founded after World War II. These organizations all existed to establish and enforce standards, but their influence waned with increasing government regulation. In March 2007, three of these organizations (ASFMRA, ASA, and AI) announced an agreement in principle to merge. NAIFA (National Association of Independent Fee Appraisers), a charter member of The Appraisal Foundation, helped to write Title XI, the Real Estate Appraisal Reform Amendments. It was founded in 1961.
U.S. Regulatory and Professional Standards and Guidelines USPAP compliant valuation and independent-appraisal reviews for federally regulated banks and financial institutions, asset-based lenders, family offices, endowments and foundations, high net worth individuals, private-equity investors and managed funds and, independent appraisal review expert witness and litigation support services to attorneys and in arbitration / mediation and as umpires.
In most instances, an appraiser will spend their time determining the value of one piece of property at a time. Building up their expertise in making their assessments often leads appraisers to specialize in a particular area of real estate. For example, a commercial appraiser could focus on the market for office buildings, hotels, retail locations, and other properties that include an income generating quality.
If your loan is a conventional loan, then it is subject to the rules of the Home Valuation Code of Conduct (HVCC). Barb Torres, an accredited senior appraiser says, "As soon as the parties find an appraiser is coming out who is not familiar with the local market, they have every right to contact the lender (preferably in writing) to DEMAND a local appraiser be used."