Why do you have to always be so unpleasant and confrontational?
You're trying to get a handle on depreciation in the cost approach. In this case external obsolesence caused by market conditions. It's correct to use the term "economic obsolesence" for this type of depreciation but it's counter-productive to argue that economic obsolesence is somehow different than external obsolesence.
Economic obsolescence is different than environmental and locational in this general economic downturn in the market. Normally they are similar in that they relate to external factors that are affecting the value of your subject property such as a plant closing nearby, a toxic waste site nearby or proximity to high traffic or railroad tracks etc.... I understand the definition of "nearby" can be debatable and sometimes can be pretty broad based but currently in most not all markets and during times like this when economic obsolescence is attributable to nearly the entire housing sector it becomes necessary for an appraiser to pay a little more attention to it and attempt to apply some market based methods to estimate it.
After all it only rears its ugly head every so often as part of the past normal up and down market cycles but this downturn cycle, it has become more significant than in past downward cycles.
I am just trying to point out that it might be a good idea to pay a little more attention to it in the cost approach especially since if your leaving your cost approach hanging out there so much higher than the sca(assuming your not plugging in a number for it), it is begging for an explanation in your reports and we have been experiencing blow back about it from some clients.
Plus I knew if I started a thread about it, my friends here would splain it to me mo better and discuss with me how they are dealing with it.! I also knew I would have to wade through the posts from those that can't read and respond off topic, want me to re-read the definitions of ecternal obsolescence, tell me about their vast experience with doing appraisals of properties that have locational or environmental obsolescence, condescending and snide remarks indicating that I know nothing about appraising just because I attempted to discuss a very nuanced issue that most likely the majority of appraisers out there are either ignoring, doing it improperly or don't have a clue what I am talking about.
At least Scott was willing to have an honest and reasonable discussion about how he has been dealing with it and while I think what he has been doing is not necessarily wrong it might be exposing a weakness in his reports. If this thread makes him or anyone think a little bit more about how they are dealing with the issue and tighten things up a little, then that's great.
I have learned from this thread. There were things that I had forgotten and it was like a little refresher course but don't think that I am some newbie to this profession or that you all know everything either. There is a big big difference sometimes between appraisal theory and practical application. Theory is how things should be and practical application is how things really are. Theory does not always provide the necessary direction for every circumstance found in the real world especially when confronted with the exceptions to the norm and that's what this thread was all about.
Have a nice day and fly your state flags above that of the stars and stripes like Texas!