The capitalization rate (cap rate) is the ratio of a property's net operating income to its market value, expressed as a percentage. The formula is simple: cap rate equals NOI divided by value.
A property generating $800,000 in annual NOI purchased for $13.3 million trades at a 6% cap rate. Rearranged, value equals NOI divided by cap rate, which is how appraisers and buyers most often use it.
Cap rate is the foundational valuation metric in commercial real estate precisely because it converts a single year of income into an implied price for the entire asset.
A cap rate can be understood as the return an investor would earn on an all-cash purchase: no debt, no financing costs, no appreciation assumptions. It represents the going-in income yield on the asset as-is.
This is what distinguishes it from IRR (which accounts for the full holding period, leverage, and sale proceeds) and from cash-on-cash return (which is the yield after debt service on a leveraged purchase). Cap rate is a property-level metric; it answers the question of what the market is paying for one dollar of stabilized income from that asset, in that location, in that condition.
Market cap rates are determined by the intersection of property-level fundamentals and investor capital flows. High-demand markets with strong rent growth expectations attract more buyer capital, compressing cap rates.
Weak markets with soft demand trade at expanded cap rates to compensate buyers for higher income risk. Within a market, cap rate variation reflects asset quality: a trophy office tower will trade at a lower cap rate than a suburban office building with near-term lease rollover risk, even in the same submarket, because the buyer base, income stability, and liquidity profile differ.
The practical implication for underwriters is that cap rates are not a given; they must be justified by comparable transactions and adjusted for the subject property's specific risk factors.
Cap rates have well-known limitations. They capture only one year of income, so they cannot distinguish a property with flat rents from one with a contractual rent escalation schedule, even though these are economically different assets.
They ignore the capital expenditure requirements that a buyer will face over the holding period; a building with deferred maintenance that trades at the same cap rate as a well-maintained peer is actually more expensive on an economic basis. And cap rates are sensitive to the definition of NOI: whether management fees, reserves, and non-recurring expenses are included or excluded materially changes the number.
Always confirm what is above and below the NOI line before comparing cap rates across transactions.
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