No, Danny, I'm sure your library is one of the most-complete in your market area ! It definitely beats mine. Allow me to share two snippetts, however...
From Appraising Residential Properties, 2nd edition (1998), pgs. 326-327,pub. by the A.I. :
"Effective Age is the age indicated by the condition and utility of the structure. It is determined by an appraiser's judgment and is not a market-derivable figure. Similar buildings do not necessarily depreciate at the same rate. The maintenance standards of owners or occupants can influence the pace of building deterioration. If a building is better maintained than others in the market area, its effective age will be less than its actual age. If a building is poorly maintained, its effective age may be greater. If a building has received typical maintenance, its effective age and actual age may be the same. Effective age is related to remaining economic life. The total economic life of similar structures, minus the effective age of the subject building, equals the remaining economic life of the subject."
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If one's approach to determining Effective Age is NOT an absolute, and detailed result of mathematical calculation......then the AI should remove that second sentence as typed above. Perhaps they have by now, though, as I take this passage from a 1998 publication. And, while they say that Effective Age is "related to" REL they do not offer an elaborated focus beyond that statement. (Re-read the second sentence.) Perhaps their last sentence could have been re-written as : "The total economic life of similar structures, minus the appraiser's opinion of the effective age of the subject, would equal an expression of remaining economic life of the subject." Would a sentence written in that slightly amended way be incorrect ?
From the 4150.2, Section 405.02 - Actual and Effective Ages :
"The relationship between the actual and effective ages of the property is a good indication of its condition. A property that has been well maintained will generally have an effective age somewhat lower than its actual age. On the other hand, a property that has an effective age higher than its actual age probably has not been well maintained or may have a particular physical problem. In such cases, the lender should pay particular attention to the condition of the subject property in its review of any appraisal report that requires the appraiser to address the actual and effective ages of a property."
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Sounds a little like the 2002 Selling Guide might have borrowed some text and consideration from the AI's 1998 book, but not in any totality. The Selling Guide refers to the subject as "having" an effective age....but the "having" part is only going to come from an appraiser applying their own.....judgment, or opinion, or gut-feeling. Whether those words sound unpalatible or not is open for further discussion. I am pleased to see the Selling Guide referring to the importance of one describing the home's condition adequately, just as I suggested to Gina that she tie her Eff. Age and Condition remarks together. A poorly opined E.A. can certainly clash with one's description of condition of improvements.....especially if there is little to no text describing condition and a whopper of a number for E.A. is given.....and vice-versa.
Danny,......Neither of the sources I have quoted offers any "recognized methods and techniques". Would you please share here the exacting text passage you have within your mentioned book title, so that it can become clearer to me and others how I may have misused simple colloquial language and choice of words when conveying to Gina how she might approach her situation. I wholeheartedly consent that your library is better than mine.
Gina ?,.......So, have you reconciled your situation with that duplex yet ?