Sales comparables, or sales comps, are recent transaction prices on properties similar to a subject asset, adjusted for differences in size, quality, location, and timing to estimate what the subject is worth. Analysts reconcile several adjusted comps into one value conclusion. Sales comps are the core evidence behind the sales comparison approach to valuation.
What Are Sales Comparables and How Are They Selected?
Sales comparables are closed sales of properties similar enough to the subject that their prices predict its value. A comp must match on property type, then align on submarket, size, age, quality, and buyer profile. The Uniform Standards of Professional Appraisal Practice sets no fixed minimum, but appraisers commonly analyze at least three comparable sales.
Recency and proximity carry the most weight. A sale that closed last quarter in the same submarket beats a year-old sale across town, because pricing moves with interest rates and market conditions. In commercial real estate, comp data typically comes from platforms like CoStar and Crexi rather than the residential MLS.
Selection factor | What to match |
Property type | Multifamily to multifamily, industrial to industrial; never cross types |
Submarket | Same competitive geography as the subject |
Recency | Ideally within the last 6 to 12 months |
Size | Comparable square footage or unit count; adjust per unit or per square foot |
Quality and age | Similar class, condition, and building systems |
Sale conditions | Arm's-length sales; exclude distressed or related-party deals |
The output is not the raw average of the comps. It is an adjusted price, reached by nudging each comp up or down for how it differs from the subject.
Why Sales Comparables Matter
Sales comparables matter because they translate a market of scattered transactions into a defensible number a buyer, seller, or lender can act on. Overpay by 5% on a $10 million asset and $500,000 of value is gone before day one. Comps are the evidence that keeps the pricing honest and survives an investment committee or a lender's review.
The operator-side risk is cherry-picking. Because comps require judgment on which sales qualify and how to adjust them, an aggressive party can select favorable comps and justify a price the market will not support. Disciplined analysts document every comp, every adjustment, and the reasoning, so the value conclusion can be defended rather than asserted.
Example
An analyst is valuing a 50,000 square foot subject industrial building. Four recent arm's-length comps are gathered, each adjusted for how it differs from the subject on age and location.
Comp | Sale price per sq ft | Adjustment | Adjusted price per sq ft |
Comp A (newer, superior) | $185.00 | -$10.00 | $175.00 |
Comp B (similar) | $172.00 | $0.00 | $172.00 |
Comp C (inferior location) | $160.00 | +$12.00 | $172.00 |
Comp D (older) | $178.00 | -$4.00 | $174.00 |
The four adjusted figures cluster at $175.00, $172.00, $172.00, and $174.00, averaging $173.25 per square foot. Applied to 50,000 square feet, that supports a value of roughly $8,662,500 for the subject building. The tight cluster after adjustment is the signal the comp set is reliable; a wide spread would flag comps that are not truly comparable.
Variations and Edge Cases
Sales comparables behave differently by property type and market depth, so a comp that looks similar on price can differ once the deal terms are normalized. The table below lists variants an analyst should reconcile before treating comps as equivalent.
Variant | Treatment |
Distressed sales | Foreclosures and short sales sit below market; exclude or adjust heavily |
Portfolio deals | A bulk price per asset differs from a standalone sale; unbundle before comparing |
Seller financing | Below-market financing inflates the headline price; normalize to cash-equivalent |
Thin comp sets | In small submarkets, widen the radius or time window before loosening match criteria |
Value-add versus stabilized | A vacant fixer and a fully leased asset are not the same trade |
The common mistake is treating an unadjusted price per square foot as a value. Two identical prices can describe very different economics once condition, occupancy, and deal terms are normalized.
Sales Comparables vs Rent Comparables
Sales comparables are often confused with rent comparables, and they answer different questions. Sales comparables use recent transaction prices to estimate what a property is worth. Rent comparables use recent lease rates to estimate the market rent a property can charge. One informs the value conclusion; the other informs the income line.
The two connect through the income approach. Rent comps set market rent, which builds net operating income, which a cap rate then capitalizes into value, and sales comps corroborate that value directly. An appraiser uses both: rent comps to defend the revenue assumption and sales comps to defend the pricing. Confusing them collapses two separate evidence chains into one and weakens both.
Frequently Asked Questions
How many sales comparables do you need?Appraisers commonly analyze at least three closely matching comps, though USPAP sets no fixed minimum. Fewer than three leaves the estimate exposed to a single outlier sale. Quality of match matters more than raw count.
How do you adjust sales comparables?Adjust each comp up or down for how it differs from the subject on quality, size, age, location, and deal terms. A superior comp is adjusted down toward the subject; an inferior comp is adjusted up. The goal is a set of adjusted prices that estimate what the subject itself would fetch.
What is the difference between sales comps and rent comps?Sales comps use recent transaction prices to estimate what a property is worth. Rent comps use recent lease rates to estimate the market rent a property can charge. Sales comps drive the value conclusion; rent comps drive the income line.
Related Terms
Sales Comparison Approach
Rent Comparables
Price Per Square Foot
Cap Rate
Submarket