KO Appraisal
What is a cap rate?
A capitalization rate is the ratio between a property’s annual net operating income and its value. Divide one year of stabilised NOI by the price, and the result is the cap rate. It is the single most quoted number in commercial real estate, and the most frequently misused, because the rate itself carries no meaning until you know exactly which income figure produced it.
The formula, and the three ways to rearrange it
The relationship is a simple one, which is part of why it gets misapplied. There are three forms, and appraisers use all of them depending on what is known:
- Cap rate = net operating income ÷ value. Use this when you know what a property sold for and want to extract the rate the market paid. This is how appraisers derive rates from comparable sales. The rate is an output of the market, not an assumption.
- Value = net operating income ÷ cap rate. This is direct capitalisation, the workhorse of the income approach. It converts one year of stabilised income into a value indication.
- Net operating income = value × cap rate. Least used, but it is how you sanity-check whether an asking price implies income the property can actually produce.
Worked example
A multi-tenant retail property produces $840,000 of effective gross income. Operating expenses, property taxes, insurance, management, maintenance, reserves, run $310,000. Net operating income is therefore $530,000.
If comparable sales in that submarket indicate investors are buying similar assets at a 6.25% capitalisation rate, the indicated value is $530,000 ÷ 0.0625 = $8,480,000.
Now notice how sensitive that is. Move the rate to 5.75% and the same income supports $9,217,000. Move it to 6.75% and it supports $7,852,000. A half-point of cap rate, well within the range of reasonable disagreement. Swings this property by more than $1.3 million. That sensitivity is precisely why the rate has to be extracted from real comparable transactions rather than assumed, and why the appraisal has to show its work.
What the cap rate actually measures
A cap rate is a risk measure wearing the clothes of a return measure. It expresses what buyers will pay today for a stream of income, and the price they pay embeds every judgement they hold about that stream: how certain it is, how long it lasts, whether it grows, and what happens at the end.
Read it that way and the direction becomes intuitive. A higher cap rate means buyers paid less per dollar of income, because they judged the income riskier, shorter, or less likely to grow. A lower cap rate means they paid more, because they judged it safer or expected it to rise. The rate is the market pricing uncertainty.
- Tenant credit. Income from an investment-grade national tenant on a twenty-year lease is not the same asset as identical income from three local tenants on rolling one-year terms, and it does not price the same.
- Lease structure and term. A long lease with contractual escalations and the tenant paying operating costs transfers both risk and inflation exposure away from the owner. Short remaining term means near-term rollover risk, and rollover means downtime, leasing commissions, and tenant improvement cost.
- Property type. Sectors price differently, and the ordering among them is not fixed. It moves with capital-market conditions and sector sentiment, which is why last year’s relationship between sectors is evidence, not a rule.
- Location and submarket. Depth of tenant demand, supply pipeline, and liquidity all feed the rate. Two identical buildings ten miles apart can transact at materially different rates.
- Condition and remaining economic life. Deferred maintenance and imminent capital expenditure are often reflected partly in the rate and partly as a deduction, and an appraisal must be explicit about which, or the adjustment gets double-counted.
- The interest-rate environment on the valuation date. Cap rates do not track policy rates mechanically, but the cost and availability of debt moves what buyers can pay. This is why a rate extracted from 2021 sales is not evidence of value in a different rate environment.
Where cap rate analysis goes wrong
Nearly every serious error involves the numerator, not the rate. The rate is quoted constantly and scrutinised rarely, so a flawed NOI passes straight through into value.
- Using actual income instead of stabilised income. A property that is 70% leased in a market where 93% is normal will produce an NOI that understates its capacity. Capitalising the depressed figure and calling it value confuses a temporary condition with a permanent one, but crediting full stabilised income without deducting the cost and time to reach it overstates value just as badly.
- Omitting reserves for replacement. Roofs, HVAC, and parking surfaces are not annual expenses, so they often vanish from an owner’s operating statement. They are real costs of keeping the income stream alive, and an NOI that ignores them is overstated, which produces an artificially low cap rate on a sale comparable and contaminates every valuation that relies on it.
- Including debt service, depreciation, or income tax. NOI is the property’s income before financing and before the owner’s tax position. Mixing in a mortgage payment values one owner’s equity position, not the real estate.
- Comparing rates computed on different bases. If one broker quotes a rate on trailing income and another on a forward pro-forma, the two numbers are not comparable, and averaging them produces a figure that describes nothing.
- Applying direct capitalisation where the income is not stable. A single year of income cannot represent an irregular stream. Where leases roll unevenly or a property is in lease-up, discounted cash flow models the actual pattern and direct capitalisation does not.
Cap rate versus cash-on-cash return and IRR
These get used interchangeably and measure different things. A cap rate is a property metric, computed before financing. It describes the real estate. Cash-on-cash return divides pre-tax cash flow after debt service by the equity invested, so it describes an investor’s position, and two buyers of the same building at the same price will report different figures if they borrowed differently.
Internal rate of return goes further still, incorporating the entire holding period and the eventual sale. A cap rate is a snapshot of one year; IRR is the whole film. For appraisal purposes the distinction matters because value is an attribute of the property, so the analysis has to rest on the property-level measure.
How an appraiser derives the rate
The credible method is extraction from comparable sales: obtain the sale price and the net operating income for transactions of genuinely similar properties, verify both with a party to the deal, and compute the rate each one implies. Verification is the step that separates appraisal from a search of listing data, a rate computed from an unverified NOI is a number of unknown origin.
Where transaction evidence is thin, band-of-investment and debt-coverage techniques build a rate from mortgage and equity requirements, and published investor surveys provide corroboration. These support a conclusion; they do not replace market evidence. An appraisal that leans on a survey where real comparables existed has skipped the work.
Common questions
What does cap rate mean in real estate?
How do you calculate a cap rate?
Is a higher cap rate better?
What is the difference between cap rate and yield?
Can a cap rate be used on a single-family rental?
Why do two appraisers arrive at different cap rates for the same property?
Related reading
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