Cap rates: what they tell you before buying commercial property

Start with the relationship

Cap rate = annual net operating income ÷ purchase price or property value.

Nareit describes cap rate as a pricing and valuation measure. It helps connect the income a property produces with what a buyer pays. For the same annual operating income, a higher price produces a lower cap rate.

Check which income you are comparing

Ask whether the quoted cap rate uses the previous year’s income, a forecast for the coming year, or an assumption that vacant space has been leased. Nareit notes that both trailing and forward income are used. A forecast and an operating history answer different questions; label them clearly before comparing properties.

It is not your personal return

A cap rate does not incorporate your financing structure. It also does not capture every change in income or expense during ownership, or the eventual sale. A higher quoted cap rate therefore does not, by itself, make one building the better investment.

Use more than one measure

The CCIM Institute’s public description of its cash-flow analysis course treats capitalization rate, cash-on-cash return, internal rate of return and net present value as separate measures. It also emphasizes the timing of money entering and leaving an investment. That is a useful habit for a buyer: understand the starting income, then map the expected ownership period.

CCIM’s discussion of operating-cost pressures provides another useful reminder. Changes in insurance, property taxes and other expenses can affect the property’s cash flow and the financing conversation. Review the actual expense information rather than treating a listing’s headline as the finished analysis.

Questions to bring to a property review

Ask for the income calculation behind the cap rate and the records supporting it. Identify the assumptions about vacant space, lease renewals and future costs. Then ask what changes if those assumptions do not happen on schedule.

Use the cap rate to start a comparison. Use the leases, operating records, property condition and financing plan to work through the decision. This guide explains the concept; it does not assign a market cap rate to your property.