When someone is new to commercial real estate investing, the biggest question is often, “How do I tell if this is a good deal?” There’s no single answer, but there are two numbers you’ll hear in nearly every conversation: cap rate and net operating income. Understand those two, and most of CRE underwriting starts to make sense.

This guide walks through what each one means, how to calculate them, what counts as a “good” cap rate in 2026, and the traps that catch first-time buyers.

What Is a Cap Rate?

A capitalization rate (cap rate) is the unleveraged annual return a commercial property produces, calculated as net operating income divided by property value.

Suburban City Group

In plain terms, the cap rate tells you what return you’d earn in year one if you bought the property in cash. A building generating $80,000 in net operating income that sells for $1,000,000 has an 8% cap rate. The formula is simple:

Cap Rate = Net Operating Income (NOI) ÷ Property Value

Here’s the part that trips people up: a higher cap rate generally means a higher return but also more risk, while a lower cap rate usually signals a safer, more sought-after asset that investors will pay a premium for. A 5% cap on a modern apartment building in a strong market can be a great buy. A 5% cap on a tired strip center in a tertiary town is usually a warning sign.

What Is Net Operating Income (NOI)?

You can’t use a cap rate without first getting NOI right, and NOI is where a lot of deals quietly fall apart.

Net operating income (NOI) is a property’s total income minus its operating expenses, before mortgage payments, capital expenditures, and income taxes.

Suburban City Group

Here’s how NOI is built:

1. Start with gross potential income, all the rent if the property were fully leased.
2. Subtract vacancy and credit loss, an allowance for empty units and tenants who don’t pay.
3. Add other income, parking, laundry, signage, and similar.
4. Subtract operating expenses, property taxes, insurance, maintenance, management, and utilities the owner covers.

Critically, NOI does not include your mortgage payment, major capital improvements (a new roof), or income taxes. That’s deliberate, NOI measures the property’s performance on its own, independent of how any particular buyer finances it.

Cap Rates by Property Type in 2026

Cap rates aren’t universal, they vary by asset class, market quality, and risk profile. According to CBRE’s H2 2025 Cap Rate Survey, rates stabilized across major sectors, and many investors believe yields reached their cyclical high. Here are the general ranges market participants are seeing in 2026:

These are broad ranges, not quotes for any specific property. A deal that falls far outside the typical band for its type is telling you something, either an unusual opportunity or a hidden problem worth investigating.

How Investors Actually Use Cap Rates

Cap rates do more than score a single deal. Three common uses:

• Comparing deals: Cap rate normalizes properties of different sizes and prices so you can compare returns on an apples-to-apples basis.
• Estimating value: Rearrange the formula, Property Value = NOI ÷ Cap Rate, and you can estimate what a property is worth using comparable cap rates in the market.
• Reading the market: When cap rates fall (“compression”), values are rising. When they climb, values are softening. Cap rate trends are a pulse check on the whole sector.

What to Watch Out For

This is where our experience tends to matter most for newer investors:

• “Pro forma” NOI vs. actual. Sellers love to show projected income at full occupancy and market rents. Underwrite the real numbers, not the optimistic ones.
• Missing expenses. If management fees, reserves, or realistic maintenance aren’t in the operating expenses, NOI is inflated and the cap rate looks better than it is.
• Cap rate ignores financing. Because it’s unleveraged, the cap rate says nothing about your actual cash-on-cash return once a mortgage is involved. It’s a starting point, not the whole analysis.

None of this is investment or tax advice, every deal is different, and you should run a full analysis with your own advisors. But cap rate and NOI are the language of CRE, and once you speak it, the conversations get a lot more productive.

Frequently Asked Questions

How do you calculate a cap rate?

Divide a property’s net operating income by its value or purchase price. For example, $80,000 of NOI on a $1,000,000 property equals an 8% cap rate. The figure represents the unleveraged first-year return.

What is a good cap rate in commercial real estate?

There’s no universal “good” cap rate, it depends on asset class, market, and risk. In 2026, Class A multifamily often trades around 4.5% to 6.0%, big-box industrial around 5.0% to 6.5%, and retail strip centers around 7.0% to 9.0%. A higher cap rate means more return but typically more risk.

What’s the difference between cap rate and cash-on-cash return?

Cap rate measures the property’s unleveraged return (NOI divided by value), ignoring any mortgage. Cash-on-cash return measures your actual return after financing, the annual cash flow after debt payments divided by the cash you invested.

Does NOI include the mortgage payment?

No. Net operating income excludes mortgage payments, capital expenditures, and income taxes. It measures the property’s performance independent of how a specific buyer finances the purchase.

Why does a low cap rate mean a higher price?

Because price and cap rate move in opposite directions for a given NOI. The same $80,000 of income at a 4% cap rate implies a $2,000,000 value, versus $1,000,000 at 8%. Lower cap rates reflect assets investors consider safer and are willing to pay more for.

Considering Your Next Commercial Investment?

SCG works with investors across asset classes, multifamily, mixed-use, retail, industrial, office, throughout PA, NJ, and DE. We can help you evaluate opportunities, run the numbers, and move on the right deal.

Call 215.995.0191 or start an investor conversation through our contact page.