A building has an actual age of 25 years, an effective age of 20 years, and a total economic life of 60 years. What is the remaining economic life?
Correct Answer
B) 40 years
Remaining economic life is calculated as total economic life minus effective age: 60 years - 20 years = 40 years. Effective age, not actual age, is used in this calculation.
Why This Is the Correct Answer
Option B is correct because remaining economic life is calculated as total economic life minus effective age: 60 years - 20 years = 40 years. The effective age of 20 years is used in this calculation, not the actual age of 25 years. Effective age reflects the building's condition and functional utility, making it the appropriate measure for determining how much useful life remains. This calculation is fundamental to the cost approach and depreciation analysis.
Why the Other Options Are Wrong
Option A: 35 years
Option A incorrectly uses actual age instead of effective age in the calculation (60 - 25 = 35), which fails to account for the building's better-than-average condition reflected in its lower effective age.
Option C: 45 years
Option C appears to add the difference between actual and effective age to the correct answer (40 + 5 = 45), which is mathematically incorrect and has no basis in appraisal methodology.
Option D: 55 years
Option D incorrectly subtracts the effective age from the actual age and adds it to the total economic life (60 - 20 + 25 = 65, but shown as 55), representing a fundamental misunderstanding of the relationship between these age concepts.
TREE Method
TREE: Total minus Remaining equals Effective. Rearranged: Total minus Effective equals Remaining. Remember that effective age is what matters for economic calculations, not actual age.
How to use: When you see remaining economic life questions, immediately identify the Total economic life and Effective age (ignore actual age), then subtract: Total - Effective = Remaining.
Exam Tip
Always look for effective age in remaining economic life calculations and ignore actual age - this is a common trap on the exam.
Common Mistakes to Avoid
- -Using actual age instead of effective age in the calculation
- -Confusing the formula and subtracting total economic life from effective age
- -Adding actual age and effective age together before subtracting from total economic life
Concept Deep Dive
Analysis
This question tests the fundamental concept of remaining economic life in real estate appraisal, which is crucial for depreciation calculations in the cost approach. The key distinction being tested is between actual age (chronological age since construction) and effective age (age based on condition and functionality). Remaining economic life represents the period during which a building is expected to contribute to property value, and it's always calculated using effective age rather than actual age. This concept is essential for determining accrued depreciation and estimating future utility of improvements.
Background Knowledge
Appraisers must understand three key age concepts: actual age (chronological age since construction), effective age (age based on condition and maintenance), and economic life (total period of contribution to value). Effective age can be higher or lower than actual age depending on maintenance, renovations, and functional obsolescence.
Real-World Application
An appraiser evaluating a well-maintained 25-year-old building might determine it has an effective age of only 20 years due to recent renovations and excellent upkeep, meaning it has more remaining useful life than a poorly maintained building of the same actual age.
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