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A real estate appraisal also known as a property valuation surveyor or land valuer is the practice for evaluating the worth of the real property on ground, usually its market value, value-in-use, insurable value, investment value and liquidation value. These are to be done to know the right value of a property before decisions are made.
from: http://ezinearticles.com/?Real-Estate-Appraisal&id=4456424