ARC RA common mistakes
ARC RA · Understand the traps and how to avoid them.
Applying the sales comparison approach's adjustment sequence incorrectly: adjusting the comparables toward the subject by applying dollar adjustments to the comparable's sale price in the wrong order, or adjusting the subject toward the comparables and then failing to reverse the result.
Candidates memorize the list of elements of comparison (property rights, financing, conditions of sale, market conditions/time, location, physical characteristics) but never internalize that each adjustment is applied sequentially to the running adjusted price, so a later percentage adjustment is mistakenly computed on the original sale price instead of the previously adjusted figure.
What to do instead
Practice a full adjustment grid by hand: start with the comparable's sale price, apply each element in sequence, and recompute every percentage adjustment on the current running total. Then state the final adjusted price as the comparable's indicated value of the subject. Do ten grids with mixed dollar and percentage adjustments until the sequencing is automatic.
Treating an appraisal assignment as automatically requiring a full USPAP-compliant report with all the traditional 'complete' sections, rather than first identifying the client, intended use, and intended users and then selecting the appropriate report option and scope of work.
Candidates conflate the old 'complete/limited' report labels (retired with the 2006 USPAP rewrite) with the current Reporting Standards, and they over-rely on memorized form templates instead of the assignment-conditions analysis that drives scope of work.
What to do instead
Drill the assignment-conditions sequence: identify the problem, determine intended use and users, identify relevant characteristics, set scope of work, then choose a reporting option (Appraisal Report or Restricted Appraisal Report). Memorize that Standards 1 and 2 are separate: development versus reporting. Write out the five assignment elements from memory until they are automatic.
Confusing the three approaches' applicability rules: using the cost approach as primary support for an older, fully depreciated special-purpose building, or using the income approach for an owner-occupied single-family residence without market rent support.
Candidates learn each approach in isolation and never build a decision framework for when each is necessary, applicable, or given most weight, so they default to whichever approach they studied last or whichever the form emphasizes.
What to do instead
Build a one-page decision matrix: property type, age, data availability, and buyer/tenant profile mapped to primary and secondary approaches. Study the reasoning that the cost approach is most reliable for new construction and special-purpose properties, that the income approach requires verifiable market rent and expense data, and that the sales comparison approach is generally most reliable for residential resales.
Computing effective gross income by subtracting a vacancy and collection loss allowance from potential gross income, but then also deducting a separately estimated collection loss or 'credit loss' line, double-counting the vacancy/collection deduction.
Candidates see both a 'vacancy and collection loss' line and a 'credit loss' line on different forms and assume both must be applied, without understanding that they represent the same economic phenomenon and that the form's structure already embeds one.
What to do instead
Rebuild a reconstructed operating statement from scratch: potential gross income, minus vacancy and collection loss (one combined allowance unless data clearly separates them), equals effective gross income; minus operating expenses; equals net operating income; then handle reserves and capital items separately. Verify each line against market-extracted data rather than form defaults.
Selecting the highest and best use as the use that produces the highest indicated value without testing the four criteria (legally permissible, physically possible, financially feasible, maximally productive) in order, and skipping the 'as though vacant' versus 'as improved' distinction.
Candidates reduce HBU to a single 'most profitable use' definition and forget it is a sequential screen, and they overlook that the as-vacant analysis determines the site's ideal improvement while the as-improved analysis tests whether the existing improvement should be retained, modified, or demolished.
What to do instead
Work through the four tests in strict order for both as-vacant and as-improved scenarios on at least five property types. For as-improved, explicitly compare the value of the existing use to the value of the site as though vacant plus demolition cost to justify a demolition conclusion.
Applying the gross rent multiplier or overall capitalization rate derived from a comparable without verifying that the comparable's expense ratio, financing, and lease structure match the subject, treating the multiplier as universally transferable.
Candidates learn GRM and OAR as simple division shortcuts and do not appreciate that a multiplier implicitly embeds the comparable's operating expense ratio and financing terms, so it transfers only to properties with similar expense and risk profiles.
What to do instead
For every extracted multiplier or rate, document the comparable's expense ratio, financing, and lease terms alongside it. Practice deriving OAR from comparable sales and cross-checking it against band-of-investment and mortgage-equity methods. Reject comparables whose expense structure diverges materially from the subject.
Estimating accrued depreciation by subtracting site value from total property value and calling the remainder 'depreciation,' rather than separating physical deterioration, functional obsolescence, and external obsolescence and using the appropriate method (age-life, breakdown, or market extraction) for each.
Candidates confuse the market extraction method (which yields total depreciation from a sale) with the breakdown method (which allocates depreciation by cause), and they forget that land is not depreciated, so site value must be subtracted before comparing to cost new.
What to do instead
Practice all three depreciation methods on the same property and reconcile the results. Memorize that market extraction gives a total figure only, that the age-life method applies a ratio of effective age to total economic life to the improvement cost, and that curable versus incurable items are separated within the breakdown method. Always subtract land value before computing depreciation from a sale.
Reading a legal description and computing area from metes and bounds or lot-and-block data without closing the traverse or checking the stated area against the computed area, then accepting a plat-stated area that conflicts with the deed.
Candidates treat legal descriptions as background text rather than as data to be verified, and they do not habitually run the boundary closure check or reconcile deed area against assessor and plat figures.
What to do instead
For every site problem, sketch the parcel, sum the boundary calls, confirm closure, and compute area from the geometry. Note any discrepancy between deed, plat, and assessor records, and state which source governs and why. Practice with rectangular, irregular, and metes-and-bounds parcels until the arithmetic is routine.
Writing the reconciliation as a restatement of all three approach values with an unexplained average, instead of weighing the approaches by relevance and reliability and providing a reasoned final opinion of value.
Candidates treat reconciliation as arithmetic averaging because it feels objective, and they lack language for explaining why one approach deserves more weight given the property type, data quality, and intended use.
What to do instead
Practice writing reconciliation paragraphs that name the approach given most weight, cite the specific data quality and property characteristics driving that choice, explain why the other approaches were given less or no weight, and state a final value that falls within the range of the approach indicators with justification for its position.
Describing the neighborhood and market conditions with generic boilerplate ('stable, well-maintained area') instead of citing specific, dated, verifiable data such as absorption rates, days on market, list-to-sale price ratios, and median price trends with their sources.
Candidates rely on form language and prior report templates because they have not practiced extracting and citing primary market data, and they underestimate how heavily exam questions and reviewers weight specificity and support.
What to do instead
Build a market analysis template requiring, for each conclusion, the specific statistic, the time period, and the data source. Practice computing absorption rate and months of supply from raw counts of listings and sales, and practice writing a three-sentence market conditions conclusion that would be defensible if challenged.