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1,200 sq ft of otherwise rentable space and incurs $18,000 annually in excess maintenance and energy costs due to outdated, oversized equipment.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.
Superadequacy is a type of functional obsolescence arising when an improvement exceeds market expectations or requirements to the point that its cost is not supported by its contribution to value. USPAP Advisory Opinion 9 (AO-9) states that superadequacies are generally incurable because removal or modification does not yield a value increase equal to the cost. Here, the retrofit cost ($320,000) exceeds any resulting value gain (zero), confirming incurability. The appropriate treatment is to estimate the loss in value attributable to the superadequacy — i.e., the present value of lost rent (1,200 sq ft × market rent/sq ft × present value factor) plus capitalized excess operating costs. Option C correctly identifies this principle and terminology. Option A incorrectly capitalizes only operating costs while ignoring lost income; Option B misclassifies as curable without economic justification; Option D violates the definition of reproduction cost new, which includes all existing improvements regardless of utility (USPAP Standards Rule 1-4).
Why This Is the Correct Answer
Superadequacy is a type of functional obsolescence arising when an improvement exceeds market expectations or requirements to the point that its cost is not supported by its contribution to value. USPAP Advisory Opinion 9 (AO-9) states that superadequacies are generally incurable because removal or modification does not yield a value increase equal to the cost. Here, the retrofit cost ($320,000) exceeds any resulting value gain (zero), confirming incurability. The appropriate treatment is to estimate the loss in value attributable to the superadequacy — i.e., the present value of lost rent (1,200 sq ft × market rent/sq ft × present value factor) plus capitalized excess operating costs. Option C correctly identifies this principle and terminology. Option A incorrectly capitalizes only operating costs while ignoring lost income; Option B misclassifies as curable without economic justification; Option D violates the definition of reproduction cost new, which includes all existing improvements regardless of utility (USPAP Standards Rule 1-4).
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