A commercial office building was constructed in 2005 with a full-floor mechanical penthouse housing HVAC equipment for the entire structure. Current market design standards call for distributed, floor-by-floor mechanical rooms, eliminating the need for a dedicated penthouse. The penthouse occupies 1,200 sq ft of otherwise rentable space and incurs $18,000 annually in excess maintenance and energy costs due to outdated, oversized equipment. An appraiser estimates the cost to remove the penthouse and retrofit mechanical systems floor-by-floor at $320,000 — but doing so would yield no incremental rental income or value increase. How should the appraiser treat the penthouse in the cost approach?
Correct Answer
C) Treat the penthouse as superadequacy and deduct its contributory value — estimated as the present value of lost rent plus excess operating costs — as incurable functional obsolescence.
Why this is correct: A superadequacy is a form of functional obsolescence created by an improvement that exceeds what the market requires, so its cost is not recovered in value. The curability test is economic, not physical: an item is curable only if the cost to cure is recovered by an equal or greater increase in value. Removing the penthouse costs $320,000 and produces no incremental income or value, so the superadequacy is incurable, and the loss is measured as the value the penthouse costs the property — the present value of the rent lost on the 1,200 square feet it occupies plus the capitalized excess operating costs. Why the other choices are wrong: 'Capitalize the $18,000 annual excess cost at a 7% rate ($257,143) and treat as incurable functional obsolescence' is arithmetically sound as far as it goes ($18,000 / 0.07 = $257,143), but it captures only the operating penalty and ignores the rent forgone on 1,200 square feet of otherwise leasable area. 'Treat the $320,000 retrofit cost as curable functional obsolescence because it is physically possible to correct' applies the wrong test; physical feasibility does not make an item curable when the cure returns nothing. 'Exclude the penthouse entirely from the reproduction cost new estimate since it is no longer functionally useful' contradicts the meaning of reproduction cost new, which is the cost to construct a replica of the existing improvements, superadequacies included; the penthouse enters the cost figure and is then removed through the depreciation deduction. Exam tip: Curable means the cure pays for itself. If the cost to cure exceeds the value it creates, the obsolescence is incurable and is measured by the loss in value, not by the cost of the cure.
Why This Is the Correct Answer
Option C names both the correct classification (superadequacy, a form of functional obsolescence) and the correct measurement (the value the penthouse costs the property, captured as lost rent plus excess operating expenses). It is incurable because spending $320,000 buys no value increase, which fails the cost-to-cure test. Measuring the deduction by the harm rather than by the cure keeps the cost approach internally consistent, since the reproduction cost new already included the penthouse.
Why the Other Options Are Wrong
Option A: Capitalize the $18,000 annual excess cost at a 7% rate ($257,143) and treat as incurable functional obsolescence.
Capitalizing only the $18,000 of excess operating cost captures one half of the injury and ignores the other. The penthouse also sterilizes 1,200 square feet of otherwise rentable area, and that lost rental stream is a separate, additive component of the value loss. Option A is seductive because the capitalization is clean and the arithmetic works out to a tidy $257,143, but a tidy number computed from an incomplete input is still wrong.
Option B: Treat the $320,000 retrofit cost as curable functional obsolescence because it is physically possible to correct.
Curability in appraisal is an economic test, not a question of whether a contractor could physically do the work. Nearly every superadequacy is physically removable; that is not what makes it curable. Since spending $320,000 yields no value increase, the item fails the test and classifying it as curable would also wrongly set the deduction equal to the cure cost.
Option D: Exclude the penthouse entirely from the reproduction cost new estimate since it is no longer functionally useful.
Reproduction cost new is the cost to build an exact replica of the subject including all of its existing components, superadequacies and all. Dropping the penthouse from that estimate would produce a replacement cost figure instead, and it would also double-count the benefit, because the appraiser would be both omitting the cost and taking no obsolescence deduction. The option is tempting because 'no longer useful, so leave it out' sounds efficient, but it destroys the reproduction cost definition.
Cure Only If It Pays
Say it as an equation: cure the item only if value gained is at least cost to cure. If the cure costs $320,000 and the value gain is $0, the answer is written on the page. Then remember that for an incurable item you deduct the harm (lost rent plus excess expenses), while for a curable item you deduct the cure.
How to use: When a stem gives you both a retrofit cost and a statement about the resulting value change, compare those two numbers first. That single comparison sorts curable from incurable, and the classification then dictates whether the deduction is the cure cost or the capitalized loss.
Exam Tip
If the stem tells you a fix produces 'no incremental rental income or value increase,' the writer has handed you the word incurable; do not be talked out of it by an option that says the work is physically possible.
Common Mistakes to Avoid
- -Treating physical feasibility as proof of curability instead of running the cost-versus-value-gain test
- -Capitalizing excess operating expense while forgetting the rent lost to the space the superadequacy occupies
- -Omitting a superadequate component from reproduction cost new and then also deducting obsolescence for it, double-counting the benefit
Concept Deep Dive
Analysis
This is a superadequacy problem, which is a subtype of functional obsolescence. A superadequacy exists when some component of the improvement exceeds what the market requires, so the cost of that component is not matched by a contribution to value. The curable versus incurable test is purely economic, never merely physical: an item is curable only if the cost to cure is equal to or less than the increase in value the cure produces. Here the retrofit costs $320,000 and produces zero incremental value, so the arithmetic is decisive and the superadequacy is incurable. The measure of an incurable superadequacy is the loss in value it causes, which in this fact pattern is the present value of the rent lost on the 1,200 square feet plus the capitalized excess operating cost, not the cost to remove it.
Background Knowledge
You need the difference between reproduction cost new (exact replica, includes superadequacies) and replacement cost new (equivalent utility, excludes them, so much of the functional obsolescence is already accounted for). You also need the three categories of depreciation and the cost-to-cure test: curable when cost to cure is no greater than the resulting value increase, incurable otherwise. Finally, be able to measure incurable functional obsolescence by capitalized rent loss and capitalized excess operating expense.
Real-World Application
An appraiser valuing a 1980s office building finds an oversized central plant occupying a full floor. Local tenants now expect floor-by-floor VAV systems, and the owner's engineer prices a conversion above any rent gain, so the appraiser deducts the capitalized value of the sterilized floor area and the excess energy spend as incurable functional obsolescence rather than the conversion cost.
More Cost Approach Questions
In a cost approach for a proposed building, the appropriate cost basis is generally:
A warehouse cost $210,000 to build when the cost index stood at 105. The index is now 210. Its indicated current cost is:
The age-life method expresses depreciation as:
Market extraction of depreciation is limited by the fact that it:
Functional obsolescence caused by a deficiency is measured as curable when:
Curable physical deterioration is measured at cost to cure because:
A 2,050 sq ft dwelling is priced at $178 per square foot with a $34,000 detached garage and $21,500 of site improvements. Cost new is:
A house has three bedrooms sharing one bathroom, and adding a second bath is economically justified. This is:
Direct costs in a construction budget include:
An appraiser writes that a 40-year-old house has an effective age of 10 but describes original wiring, original kitchen and a 25-year-old roof. The report's problem is:
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