The capitalization rate, or cap rate, is a simple ratio with an outsized role in commercial real estate: Cap Rate = Net Operating Income ÷ Property Value. Flip the formula around and it becomes a valuation tool — Value = NOI ÷ Cap Rate — which is exactly how the income approach to commercial appraisal works. Given a property's NOI (module 03) and a cap rate drawn from comparable recent sales of similar income-producing properties, an appraiser derives an indicated value directly.
Because value and cap rate move in opposite directions for a given NOI, this relationship trips up people new to commercial real estate: a lower cap rate corresponds to a higher value for the same income, not a lower one. A property throwing off $100,000 in NOI is worth $2,000,000 at a 5% cap rate but only $1,000,000 at a 10% cap rate — the market is willing to pay twice as much for the same income stream when it is priced at the lower cap rate.
A cap rate is best understood as the market's expression of risk and return for a given property type, location and quality tier at a point in time. Lower cap rates generally attach to properties the market perceives as lower-risk or higher-growth: well-located multi-unit residential buildings in strong rental markets, grocery-anchored retail with long-term national tenants, newer Class A buildings (module 05). Higher cap rates attach to properties the market sees as riskier or with less growth potential: older buildings needing capital investment, secondary or tertiary locations, shorter or weaker lease terms, or property types facing structural headwinds.
Cap rates also move with the broader interest-rate and investment environment — when the cost of capital rises broadly, investors generally demand higher cap rates (lower prices) for a given level of income, and when it falls, cap rates tend to compress. This is one of the reasons cap rates for a specific property type and market are not a fixed, textbook number — they are observed from actual recent transactions and shift with market conditions, which is why current comparable sales data matters more than any rule of thumb.
Commercial appraisers generally consider up to three approaches to value: the direct comparison approach (comparing recent sales of similar properties, much like residential appraisal), the cost approach (what it would cost to replace the building today, less depreciation, plus land value), and the income approach (capitalizing NOI, as described above). For an income-producing property — a rental apartment building, a leased retail plaza, a fully tenanted office building — the income approach is typically given the most weight, because a buyer of that kind of property is fundamentally buying a stream of income, not a place to live or a set of physical materials.
The direct comparison and cost approaches still play a role, particularly as a sanity check against the income approach's result, but a commercial mortgage broker should expect the income approach — and by extension, the accuracy of the NOI feeding it — to be the figure that most directly determines the appraised value a lender relies on.
It is worth noting explicitly that a strong cap rate-derived value and a strong DSCR are related but not identical tests, because DSCR compares NOI to the specific loan's debt service, while cap rate compares NOI to the property's market value independent of any particular loan. A property can be attractively valued on a cap-rate basis while still producing a tight DSCR, if the loan amount being requested is large relative to that value — which is really a loan-to-value question wearing a DSCR costume. Reading both figures together, rather than either in isolation, gives a much more complete picture of a file's actual risk.
Two similar apartment buildings both generate $150,000 in annual NOI. Building A trades at a 4% cap rate and Building B trades at a 7% cap rate. Which is worth more, and why?
Value = NOI ÷ Cap Rate. Building A: $150,000 ÷ 0.04 = $3,750,000. Building B: $150,000 ÷ 0.07 ≈ $2,142,857. The lower cap rate produces the higher value for identical income — this inverse relationship is exactly the point that trips people up, since it is tempting to assume a higher percentage means a bigger number. Debt service is irrelevant to this specific comparison; cap rate values the property independent of how any particular buyer chooses to finance it.
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