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THE COST APPROACH <br /> One method of�, estimating the replacement cost of a building <br /> is the use of a National Cost Service. We have used the <br /> Marshall Valuation Service, which is compiled and published <br /> by Marshall and Swift Publications Company. The cost data <br /> presented is based on years of valuation experience, thou- <br /> sands of appraisals and continuous analysis of the cost of <br /> new buildings . This publication has been nationally recog- <br /> nized as an authority in the appraisal field over thirty- <br /> five years and covers 50 states and Canada. <br /> Current cost multipliers are furnished to keep costs up to <br /> date by monthly supplements and revised e <br /> pa s in each of <br /> three districts (Eastern, Central , Western and local modi- <br /> fiers convert the costs to specific localities . <br /> Depreciation, if any, must also be recognized in arriving at <br /> a 'value" of improved property. In real estate, depreciation <br /> usually results from one or more of three sources . These <br /> sources are known as physical deterioration, functional de- <br /> preciation and environmental depreciation. <br /> Physical depreciation is generally considered to be wear and <br /> tear of the building due to age or from sources which cause <br /> the building to wear out. Functional depreciation is obso- <br /> lescence in the building due to layout , design, use of <br /> material, etc. Economic depreciation or obsolescence is <br /> a reduction in value of the total real estate caused by <br /> factors outside the property itself ; i. e. , from proximity <br /> to other properties which create depreciation in the subject <br /> property. <br /> In the case of a new or proposed building there will be, <br /> of course, no physical depreciation. Also, a prudent and <br /> informed person should not normally "build in" functional <br /> or economic depreciation. <br />