Which of the following is an example of external obsolescence?
Correct Answer
C) A busy highway constructed adjacent to the property
External obsolescence is caused by factors outside the property boundaries that negatively affect value, such as highway noise, airport flight paths, or neighborhood decline. Physical deterioration and functional obsolescence are internal to the property.
Why This Is the Correct Answer
A busy highway constructed adjacent to the property is external obsolescence because the negative factor (traffic noise, pollution, safety concerns) originates outside the property boundaries. The property owner has no control over the highway's existence or operation. This external factor decreases the property's desirability and market value. The highway represents a permanent negative influence that affects the property's highest and best use.
Why the Other Options Are Wrong
Option A: Worn carpeting throughout the house
Worn carpeting is physical deterioration, not external obsolescence, because it represents the normal wear and tear of building components within the property boundaries that the owner can control and repair.
Option B: An outdated kitchen layout
An outdated kitchen layout is functional obsolescence, not external obsolescence, because it represents a design deficiency within the property that reduces utility and desirability but originates from internal factors.
Option D: A leaking roof
A leaking roof is physical deterioration, not external obsolescence, because it represents deterioration of building components within the property boundaries that the owner can control and repair.
The EX-ternal Control Test
Remember 'EX-ternal = EX-ternal control' - if the negative factor is outside the property boundaries AND outside the owner's control, it's external obsolescence. Think 'EX-it the property to find the problem.'
How to use: When you see depreciation questions, ask yourself: 'Do I need to EXIT the property to find this problem?' If yes, and the owner can't control it, it's external obsolescence.
Exam Tip
Look for keywords indicating location relative to property boundaries - 'adjacent,' 'nearby,' 'constructed next to' often signal external obsolescence, while 'worn,' 'outdated,' 'leaking' typically indicate internal issues.
Common Mistakes to Avoid
- -Confusing functional obsolescence with external obsolescence when the problem seems 'outside normal design'
- -Thinking external obsolescence only applies to major infrastructure like highways, missing smaller external factors
- -Assuming all neighborhood factors are external obsolescence without considering if they truly impact the specific property
Concept Deep Dive
Analysis
This question tests understanding of the three types of depreciation in real estate appraisal: physical deterioration, functional obsolescence, and external obsolescence. External obsolescence is the only type that originates from factors completely outside the property boundaries and beyond the property owner's control. It's also called economic obsolescence and represents a loss in value due to negative external influences. Understanding the source and controllability of each depreciation type is crucial for accurate property valuation.
Background Knowledge
Appraisers must distinguish between three types of depreciation when using the cost approach: physical deterioration (wear and tear), functional obsolescence (design deficiencies), and external obsolescence (negative external factors). External obsolescence is the only type that cannot be cured by the property owner because it originates outside their control.
Real-World Application
When appraising a home near a newly built industrial facility, the appraiser must recognize the factory's noise and odors as external obsolescence, requiring market data analysis to quantify the value loss compared to similar homes without this negative external influence.
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