How Commercial Real Estate Is Valued: The Three Approaches

Commercial real estate valuation generally relies on three approaches, the income approach, the sales comparison approach, and the cost approach, each estimating a property's value from a different angle.

Unlike a single-family home, a commercial property isn't valued off recent comps alone. Appraisers and investors rely on three established approaches, and professionals often use more than one on the same property to check their work against each other.

The Income Approach

Of the approaches used to value commercial real estate, the income approach is the one you'll see most throughout this site. It values a property based on the income it produces, rather than what comparable properties have sold for or what it would cost to rebuild.

This formula and its mechanics are covered in depth in the cap rate chapter earlier in this series. A more detailed variant of the same approach, discounted cash flow (DCF), projects a full stream of future cash flows year by year, including the eventual sale, rather than capitalizing a single stabilized year. DCF is a modeling exercise in its own right, know the name and purpose of it at this stage, not something to dig into here. The income approach is the dominant method for stabilized, income-producing property, the majority of what this site covers, since it directly ties value to the cash flow an investor actually cares about.

The Sales Comparison Approach

Another method used to value commercial real estate is the sales comparison approach, sometimes called the market approach. It estimates value based on what similar properties have recently sold for, adjusted for differences between them.

This approach works best where recent, similar sales are actually available. It's the most familiar approach to anyone who's bought a house, since residential valuation leans on it almost exclusively. In commercial real estate, it matters most where good comps exist, and less where a property is genuinely unique.

The Cost Approach

The cost approach asks a different question entirely: what would it cost to rebuild this property from scratch today, on this land.

Replacement cost is what it would take, at today's material and labor prices, to construct a similar building. Depreciation subtracts value lost to age, wear, and outdated design. Land value is added back in separately, based on comparable land sales. The cost approach matters most where comps and income data are thin, new construction, or unique additional property sectors like healthcare, self-storage, or data center properties mentioned earlier in this series. For a stabilized apartment building with plenty of comps and reliable income, it's usually the least relevant of the three.

Broker Opinion of Value (BOV)

A Broker Opinion of Value is a faster, less formal estimate of a property's worth, typically provided by a commercial broker rather than a licensed appraiser. It's common in practice, brokers often provide one at no cost as part of building a client relationship, and it's frequently used for a quick gut check before committing time to a deal.

A BOV is not the same as a formal appraisal. An appraisal follows recognized professional standards and is typically required for a loan or a legal transaction. A BOV is a professional's informed opinion, useful for a fast read on value, but it doesn't carry the same weight or rigor.

Quick-Estimate Methods

Beyond the three formal approaches and a BOV, a few quick shortcuts show up often when investors are screening deals fast, before committing to a full valuation.

Gross Rent Multiplier (GRM): Purchase price divided by annual gross rent. More commonly used for smaller residential and small multifamily properties than for larger institutional-quality commercial assets, where the other approaches carry more weight. Still a fast way to get an initial read before digging into expenses.

Value per door: Purchase price divided by number of units, used almost exclusively for multifamily. Useful for comparing properties with different unit counts at a glance.

Cost per rentable square foot: Purchase price divided by rentable square footage, compared against typical rates in the market.

These are screening tools, not substitutes for the three formal approaches. None of them account for operating expenses or vacancy the way a proper valuation does, they're built for speed when comparing several deals quickly, not for the final number you'd actually underwrite against.

Which Approach Applies When

No single approach applies equally to every property, and even within a given property type, the actual weighting depends on the quality of evidence available for that specific asset, not a fixed formula. A stabilized office building with a thin set of recent local comps might lean more heavily on the income approach than the table below suggests, while one in a market flush with recent comparable sales might weight sales comparison more heavily despite being stabilized. The table below describes general tendencies, not fixed rules, professionals weight each approach based on how relevant and reliable it is for the specific asset in front of them.

A stabilized apartment building with a long operating history leans heavily on the income approach, since that cash flow is proven and predictable. A brand new industrial building with no rental history yet leans on the cost approach instead, since there's no track record to capitalize and often too few comparable sales to lean on either. These tendencies are a starting point, not a substitute for judgment about the specific evidence available on a given deal. Whether a deal is stabilized or unproven doesn't just drive valuation, it's also what separates a core deal from an opportunistic one.

Common Mistakes

• Relying on a single approach when multiple would sanity-check each other. If the income approach and sales comparison approach land far apart, understand that gap before moving forward, don't ignore it.
• Treating a BOV as equivalent to a formal appraisal. A BOV is useful for a quick read, but it's not a substitute when a lender or legal transaction requires the real thing.
• Applying sales comparison data from a dissimilar property type or submarket. A comp needs to actually resemble the subject property, in use, condition, and location, or the adjustment process breaks down.

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