The definition of external obsolescence, “is an element of depreciation; a defect, usually incurable, caused by negative influences outside a site and generally incurable on the part of the owner, landlord, or tenant.” Further review of definitions is Economic Depreciation, defined as, “loss of value from all causes outside the property itself.”

http://www.teamconsulting.cc/images/voss_extobsolescence.pdf

economic obsolescence: loss of value from all causes outside the property itself. Also known as environmental obsolescence and external obsolescence.

https://www.allbusiness.com/barrons_dictionary/dictionary-ec...

A környezeti avulásban számba kell venni a környezetben bekövetkezett minden olyan változást, amelynek esetleg negatív, esetleg pozitív hatása van az ingatlan értékére.

http://www.tankonyvtar.hu/hu/tartalom/tamop425/0027_FIE4/ch0...

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Note added at 1 óra (2016-05-24 10:13:57 GMT)
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Categorizing External Obsolescence

External obsolescence is a key consideration in appraisal work and results from diminished value to improvements. It is also one of the most difficult concepts to understand. It is implicit in all three basic approaches to value but is most often specifically addressed in the cost approach.

It is separately addressed because it is independent of physical deterioration and functional problems. External obsolescence
can be categorized into locational, environmental, and economic. The loss itself results from tangible influences such as traffic, odor, view, and neighborhood, as well as intangible influences such as economy and effective demand influences.

https://professional.sauder.ubc.ca/re_creditprogram/course_r...