Two of the three approaches to value get less attention than they deserve. The income approach dominates most commercial reports, so brokers and lenders tend to skim the rest. That is a mistake on the wrong property. A cost approach commercial appraisal is often the only credible path to value on a new building or a special-use facility. And the sales comparison approach tells you whether a buyer’s likely price lines up with what the income says. So here is how each one works, when it leads, and what to check when you read one.
- How the sales comparison approach is adapted for commercial property with thin data
- What a cost approach actually adds up, and how depreciation is measured
- When each approach should carry the weight, and how to check that it does
How the Sales Comparison Approach Works for Commercial Property
The sales comparison approach values a property by what similar properties sold for, adjusted for the differences. Residential appraisers usually have several nearby sales from the last few months to work with. Commercial appraisers rarely have that luxury. A submarket may produce four flex-industrial sales in two years, and none of them is a twin of the subject.
So the method bends to fit the data. The search area widens, sometimes to the whole metro. The time window stretches too. Then a market conditions adjustment has to account for price movement between the comparable’s sale and the effective date. The unit of comparison also changes with the property type: price per square foot for industrial and office, price per unit for apartments, price per net rentable square foot for self-storage, price per key for hotels.
Adjustments are where the work lives. Location, size, age and condition, construction quality, ceiling height, loading, parking ratio, and lease status all get weighed. Where possible, paired sales or market participants support each adjustment, not the appraiser’s instinct. A grid of round-number adjustments with nothing behind them is the first thing a reviewer questions. Our overview of the three approaches to value covers how they fit together. This piece goes deeper on the two that get skipped.
One more commercial wrinkle. A sale of a leased building reflects the leases, not just the bricks. A comparable with a credit tenant on a ten-year lease is not the same as a vacant building of the same size. So the appraiser has to know the terms of each sale. Confirming them with a broker or a principal is part of the job, not a courtesy.
What a Cost Approach Commercial Appraisal Adds Up
The cost approach asks a simple question. What would it cost to buy the land and build this property new today, less the value the existing building has lost? The formula runs: site value, plus replacement cost new, plus entrepreneurial incentive, minus accrued depreciation.
Site value comes from land sales, so the cost approach starts with its own small sales comparison analysis. Replacement cost new is the cost to build a modern equivalent with the same utility, not an exact copy. That distinction matters on older buildings. Reproducing a 1920s masonry warehouse with its original details would cost far more than replacing its function with a tilt-up box. Buyers pay for function. Cost figures come from published cost services, contractor bids, and recent local projects. They cover direct costs such as labor and materials, plus indirect costs such as architecture, permits, financing, and lease-up.
Entrepreneurial incentive is the profit a developer would need to take on the project. Leaving it out understates cost. Including it without market support overstates it. Either way, it should be visible in the report, not buried.
The Uniform Standards of Professional Appraisal Practice require a developed cost approach to address site value, cost new, and accrued depreciation. That last item is where most of the judgment sits.
How Depreciation Is Measured
Depreciation in an appraisal is not the tax schedule. It is the gap between what the building would cost new and what it contributes to value today. It comes in three forms.
Physical deterioration is wear. Roofs age, parking lots crack, mechanical systems reach the end of their lives. Some of it is curable, meaning the cost to fix is less than the value it adds back, and some is not. Functional obsolescence is a design problem. Think 14-foot clear height in a market that wants 32 feet, or too little power for modern loads. External obsolescence comes from outside the property line, such as rising submarket vacancy or a highway interchange that moved the traffic.
Appraisers measure depreciation several ways. The age-life method compares effective age to total economic life. Market extraction pulls depreciation out of actual sales. Subtract land value from the sale price, then compare what remains to cost new. Breakdown analysis prices each form of depreciation separately. On a new building the number is small and easy to support. On a 45-year-old building it can exceed half of cost new. The further the estimate has to reach, the less weight the approach deserves.
A Worked Example on an Industrial Building
Consider a 36,000 square foot warehouse, twelve years old, in a stable industrial submarket. The cost approach might run like this:
- Site value from land sales: $900,000
- Replacement cost new, including indirect costs and entrepreneurial incentive: $4,200,000
- Less accrued depreciation at 30 percent: $1,260,000
- Depreciated cost of improvements: $2,940,000
- Indicated value by the cost approach: $3,840,000
Now the sales comparison approach. Four metro warehouse sales, adjusted for location, age, clear height, and market conditions, bracket $98 to $112 per square foot. The appraiser reconciles to $105 per square foot, which indicates $3,780,000.
The two approaches land within two percent of each other. That agreement is itself evidence. When the approaches disagree by 20 percent, something is wrong with an input, and the reconciliation should say which one.
When There Are No Comps
Some properties have almost no market. A fire station, a school, a church, or a purpose-built manufacturing plant may trade once in a generation, and often not as the same use. These are special-use properties. Income struggles because there is no rental market. Sales comparison struggles because there are no sales. Cost is usually the only approach with real evidence behind it.
New construction is the other clear case. A building completed last year has minimal depreciation, current cost data, and a land value that can be supported. Lenders financing construction lean on cost for exactly that reason. Still, they expect it to reconcile against the completed value from the other approaches.
Cost also plays a quieter role on ordinary income property. When the income approach lands well below what it would cost to build, new supply is not feasible at current rents. That gap tells a lender something about competitive risk. It tells a broker something about how long existing stock will hold its pricing. An appraiser who develops cost even when it does not lead is giving you that signal for free.
Where Each Approach Earns Its Weight
On a stabilized multi-tenant building, income leads and sales comparison supports it. On an owner-occupied building with an active market, sales comparison may lead. Owner-user buyers think in price per square foot, not cap rate. On a special-use facility or a building still in its first year, cost leads. Our piece on what drives office building value shows the income-led case in detail.
The weighting is a judgment the appraiser has to explain. A report that develops all three approaches and then averages them has not reconciled anything. A report that leans on one approach should say why its evidence is stronger. Read the reconciliation with that question in mind, and you will know quickly whether the report was built or assembled.
Ask Which Approach Carried the Weight, and Why
Before relying on a commercial value, find the reconciliation and check three things. First, was the leading approach the right one for this property type and its data? Second, do the sales adjustments and the depreciation estimate have market support the report actually shows? Third, do the approaches agree, and if not, is the gap explained? If any answer is no, the cover-page number rests on less than it appears to. So ask the appraiser. A good one will walk you through it.
Selling a Building With No Clean Comps?
PahRoo develops the sales comparison and cost approaches with the support shown, so brokers can price with confidence and lenders can see the evidence.
Frequently Asked Questions
When is the cost approach used in commercial appraisal?
It leads on new or nearly new buildings, where depreciation is small and costs are current, and on special-use properties such as schools, churches, and purpose-built plants that have few or no comparable sales. On ordinary income property it usually supports the conclusion and serves as a feasibility check against the income approach.
How does the sales comparison approach work for commercial property?
The appraiser locates sales of similar properties, confirms the terms of each sale, and adjusts for differences in location, size, age, condition, lease status, and market conditions. Because commercial sales are scarce, the search often covers a wider area and a longer time period, and the unit of comparison changes by property type.
Why is the cost approach used for special-use property?
Special-use properties rarely sell and rarely rent, so the sales comparison and income approaches have little evidence to work with. The cost approach can still be developed from land sales, current construction costs, and a supported estimate of depreciation, which makes it the most credible path to value for those properties.
How is depreciation measured in a commercial appraisal?
Appraisal depreciation is the gap between cost new and the building’s current contribution to value. It includes physical deterioration, functional obsolescence, and external obsolescence. Appraisers estimate it through the age-life method, market extraction from actual sales, or a breakdown of each form, and the estimate should be supported in the report.
Are there enough comps for commercial property?
Often not many. A submarket may produce only a handful of relevant sales over two years. Appraisers widen the geography, extend the time window, and adjust for market conditions to compensate. When comparable sales are too thin to support a conclusion, the report should say so and lean on the cost or income approach instead.
Sales, Cost, and Income Analysis From One Appraisal Team
PahRoo Appraisal & Consultancy develops all three approaches to value on commercial assignments across Chicago and Cook County, Dallas-Fort Worth, Philadelphia, Phoenix, and Naples, from single-tenant industrial to special-use facilities. Our commercial appraisal services page covers scope and property types, our guide to net operating income explains the income side, and you can contact our team or call 773-388-0003 to discuss a specific property.