A cap rate is net operating income divided by purchase price, and it's meant to answer one narrow question: what unleveraged return does this property produce at this price. It says nothing about financing, appreciation, or tax treatment, which is exactly where investors misuse it, treating a single percentage as a complete verdict on whether a deal is good.
What Actually Goes Into Net Operating Income
Net operating income is rental income minus operating expenses, before financing costs and before capital expenditures. A seller's pro forma NOI sometimes excludes a management fee the buyer will actually pay, or understates a maintenance reserve, which inflates the cap rate the listing advertises. Recalculating NOI from the actual rent roll and a realistic expense ratio, rather than trusting the marketing number, is the first step before comparing anything, and it often moves the effective cap rate down a full point or more from what the listing sheet shows.
Lower Cap Rates Aren't Automatically Worse Deals
A property in a stable, low-vacancy Nashville submarket like Green Hills often trades at a lower cap rate than a comparable property in a higher-risk area, and that gap reflects risk, not mispricing. A 5 percent cap rate on a fully leased medical office with long-term tenants can be a better risk-adjusted deal than an 8 percent cap rate on a property with month-to-month tenants and deferred maintenance. Cap rate has to be read against the risk it's compensating for, not treated as a universal scorecard.
Cap Rate Ignores Financing Entirely
Two identical properties at the same cap rate can produce very different cash-on-cash returns depending on how they're financed, since cap rate is calculated before debt service. An investor using significant leverage should run the actual cash-on-cash return after mortgage payments, because the cap rate alone won't reveal whether the deal still cash flows once financing is factored in.
Comparing Cap Rates Across Property Types
Cap rates vary meaningfully by asset class, with net-lease retail and industrial typically trading at lower cap rates than multifamily or older office product, reflecting differences in lease length, tenant credit, and management intensity. Comparing a self-storage facility's cap rate directly against a single-tenant NNN property's cap rate without adjusting for those structural differences will produce a misleading conclusion about which is the better buy. The more useful comparison is usually within a single asset class and submarket, where the properties share enough structural similarity that the cap rate gap actually reflects a meaningful difference in risk or upside.
Where Cap Rate Fits Into A 1031 Exchange Search
An investor identifying replacement property inside a 1031 exchange's 45-day window often has to compare cap rates across several unfamiliar property types quickly, which is exactly when the metric's limitations matter most. A property with a headline cap rate that looks attractive on a one-page summary can still be a weaker replacement than one with a lower cap rate but a stronger tenant and longer lease term, and the exchange timeline doesn't leave much room to discover that after closing. Lining up someone who can pull and sanity-check NOI figures on a shortlist of candidate properties before the 45-day deadline, rather than after an identification is locked in, avoids having to live with a cap rate that turned out to be inflated.
Common Questions
What is a good cap rate for a commercial property?
There isn't a universal good number; it depends on property type, location risk, and tenant quality, with stable low-risk assets trading at lower cap rates than higher-risk ones.
Does cap rate account for the mortgage on a property?
No. Cap rate is calculated on net operating income before debt service, so it doesn't reflect how financing affects the actual cash return to the buyer.
Why do sellers sometimes advertise an inflated cap rate?
By understating expenses like management fees or maintenance reserves in the pro forma NOI, a seller can make the advertised cap rate look higher than the property will actually perform.
Can cap rate be used to compare different property types?
Only with caution. Asset classes like net-lease retail, multifamily, and self-storage carry structurally different cap rates, so a direct comparison without adjusting for those differences can be misleading.
Why does cap rate matter during a 1031 exchange?
Investors identifying replacement property within the 45-day window often compare cap rates quickly across unfamiliar property types, making it important to understand what the metric does and doesn't capture.