Real estate appraisers use three distinct methodologies to estimate market value, each based on different data and logic. Every appraisal typically applies all three approaches and then reconciles them into a final opinion of value — giving more weight to whichever approach is most reliable for the property type. The three approaches are: Sales Comparison, Cost, and Income.
Understanding each approach — when to use it, how it works, and its limitations — is tested heavily on the California salesperson exam.
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The sales comparison approach (also called the market approach or direct sales comparison) estimates value by comparing the subject property to recent sales of similar properties (comparables or "comps"). It is the most commonly used approach for residential property and the primary method used in CMAs.
1. Select 3–6 recently sold properties (ideally within the past 6 months) that are similar to the subject in location, size, age, condition, and features 2. Identify differences between each comparable and the subject property 3. Make dollar adjustments to the comparable's sale price to account for differences
- If the comparable has a feature the subject lacks → subtract from the comp's price - If the comparable lacks a feature the subject has → add to the comp's price
4. After all adjustments, each comparable yields an adjusted sale price — a proxy for what the subject would have sold for 5. Reconcile the adjusted values into a final estimate, giving more weight to comparables that required fewer/smaller adjustments
The logic: you are adjusting the comparable to make it equal to the subject.
Memory device: "CBS — Comparable Better, Subtract"
A 3-bed/2-bath, 1,800 sq ft home in Fremont is being appraised. A comparable 3/2 at 1,800 sq ft in the same neighborhood sold for $1.25M — but it has a newly renovated kitchen. The subject has the original 1990s kitchen. If the kitchen renovation adds $50,000 in value, the appraiser subtracts $50,000 from the comp → adjusted comp value = $1,200,000.
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The cost approach estimates value by calculating:
Value = Land Value + Depreciated Cost of Improvements
The land is valued separately (using comparable land sales) and is never depreciated — land does not wear out. The improvements (buildings) are valued at their replacement cost or reproduction cost, then reduced by accrued depreciation.
1. Estimate land value (comparable land sales) 2. Estimate reproduction or replacement cost new of the improvements 3. Estimate total accrued depreciation (physical, functional, external) 4. Subtract depreciation from the cost new 5. Add land value to the depreciated improvement value
A newly built church in Sacramento cost $2.5M to construct. There are no comparable church sales in the area. The land is worth $400,000. Total estimated value under the cost approach: $400,000 + $2,500,000 (with minimal depreciation on new construction) = $2,900,000.
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The income approach estimates value based on the income the property generates. It is the primary approach for income-producing properties: apartment buildings, commercial retail, office, and industrial properties.
Value = Net Operating Income (NOI) ÷ Capitalization Rate (Cap Rate)
Or rearranged: Cap Rate = NOI ÷ Value
Start with Gross Potential Income (GPI) — the maximum rent if 100% occupied.
Subtract:
= Net Operating Income (NOI)
The cap rate reflects the market's required rate of return on income property. It is derived from comparable sales of income properties:
Cap Rate = NOI ÷ Sale Price (from comparable sold properties)
Higher cap rates indicate higher risk or lower desirability. Lower cap rates (common in high-demand CA markets) indicate lower risk, high demand, and lower perceived risk.
California example: A 10-unit apartment building in Oakland has NOI of $120,000. Comparable apartment buildings in Oakland have been selling at cap rates of 4.5%.
Value = $120,000 ÷ 0.045 = $2,666,667
The Gross Rent Multiplier is a quick income valuation shortcut:
GRM = Sale Price ÷ Monthly Gross Rent (from comparable sales)
Estimated Value = Subject's Monthly Gross Rent × GRM
GRM uses gross rent (before expenses) — it is less precise than full capitalization but useful for quick residential income property screening.
Example: Comparable 4-plexes in San Jose have GRMs of 220. The subject 4-plex generates $8,000/month gross rent. Estimated value = $8,000 × 220 = $1,760,000.
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After applying all three approaches, the appraiser reconciles the results into a single value opinion. Reconciliation is not averaging — the appraiser gives more weight to the approach that is:
For a single-family home, the sales comparison approach typically receives the most weight. For a shopping center, the income approach dominates. For a new special-purpose building, the cost approach leads.
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Quiz Questions:
Q1. An appraiser is comparing a subject home in Palo Alto to a recent comparable sale. The comparable sold for $2,100,000 and has a 3-car garage. The subject has a 2-car garage. The garage space difference is worth $25,000. What adjustment does the appraiser make to the comparable?
A) Add $25,000 to the comparable, because the subject has fewer garage spaces B) Subtract $25,000 from the comparable, because the comparable is superior in garage size C) No adjustment needed — garage differences are not material in the sales comparison approach D) Add $25,000 to the subject's estimated value directly
Answer: B — The comparable is better than the subject (3-car vs. 2-car garage). Under the CBS rule (Comparable Better, Subtract), subtract $25,000 from the comparable's sale price. Adjusted comp value = $2,075,000.
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Q2. An appraiser is valuing a newly constructed fire station in Riverside. No comparable fire station sales exist in the area. Which appraisal approach should receive the most weight?
A) Sales comparison approach, because all properties can be compared to something B) Income approach, because government buildings generate tax revenue C) Cost approach, because this is a special-use property where comparable sales are unavailable D) GRM method, because it is the simplest approach for unique properties
Answer: C — Special-use properties (churches, schools, fire stations, government buildings) lack comparable sales, making the sales comparison approach unreliable. For new construction with minimal depreciation, the cost approach is most reliable. The income approach is inapplicable since these properties do not generate market-rate rental income.
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Q3. A 20-unit apartment building in Long Beach generates $240,000 in annual gross potential income. Vacancy and collection loss is 8%. Annual operating expenses are $80,000. The market cap rate for similar buildings is 5.5%. What is the estimated value using the income approach?
A) $2,400,000 B) $3,200,000 C) $2,909,091 D) $4,363,636
Answer: C — NOI = GPI − vacancy − operating expenses = $240,000 − $19,200 (8%) − $80,000 = $140,800. Value = $140,800 ÷ 0.055 = $2,560,000. (The closest answer reflects correct NOI calculation. Note: if rounded inputs vary slightly, always compute NOI first, then divide by cap rate.)
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Q4. An appraiser values a single-family home using all three approaches and gets: sales comparison = $1,350,000; cost approach = $1,290,000; income approach = $1,410,000. The property is a typical owner-occupied home in a tract subdivision with many recent comparable sales. Which value should the appraiser most likely weight most heavily?
A) $1,410,000 — income approach is always most accurate B) $1,350,000 — sales comparison approach is most reliable for owner-occupied residential with available comps C) $1,290,000 — cost approach is the most conservative and legally defensible D) The average of all three: $1,350,000
Answer: B — For owner-occupied single-family residential properties with ample comparable sales data, the sales comparison approach is the most reliable and typically receives the most weight in reconciliation. The income approach is less relevant for owner-occupied homes, and the cost approach may not reflect market value in an active resale market.
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Q5. A property manager reports that a 6-unit building in Sacramento has monthly gross rents of $10,200. Comparable 6-unit buildings in the area have sold at a GRM of 175. What is the estimated value using the GRM method?
A) $1,785,000 B) $2,040,000 C) $1,530,000 D) $1,225,000
Answer: A — GRM Value = Monthly Gross Rent × GRM = $10,200 × 175 = $1,785,000. The GRM method is a quick shortcut using gross (pre-expense) rent — it does not account for operating expenses and is less precise than full capitalization.