Cap Rate

The cap rate (capitalization rate) is the annual net operating income (NOI) of a property divided by its purchase price or current market value. Cap rate is the fundamental valuation metric in real estate, representing the unleveraged return an investor would earn on an all-cash purchase.

The cap rate formula and intuition

Cap rate = Annual NOI ÷ Property Value

Example: A property generating $500,000 annual NOI purchased for $10,000,000 has a 5% cap rate ($500K ÷ $10M).

The cap rate represents the unleveraged return: if an investor buys the property for all cash and holds it for income (no appreciation), they earn 5% per year.

Cap rates vary by market and property quality

Cap rates are not uniform across properties. They vary based on:

Market strength: Prime downtown office in San Francisco might trade at a 3% cap rate; distressed industrial in declining region at 8%.

Property quality: A new, well-maintained apartment building in a hot market might be 4% cap rate. An older, less-desirable building in the same market might be 6%.

Lease creditworthiness: A property leased to a Fortune 500 company might be 3.5% cap rate. A property with marginal tenants might be 7%.

Lease term: A long-term lease (10+ years) with growth escalators is lower cap rate. A short-term lease (2–3 years) is higher cap rate.

Leverage risk: Institutional investors focused on quality may accept 4% cap rates on core properties. Value investors may demand 7% to compensate for execution risk and uncertainty.

Inverse relationship between cap rate and price

There is an inverse relationship between cap rate and property price: lower cap rates mean the property is more expensive relative to its income. Higher cap rates mean the property is cheaper relative to its income.

If two similar properties both generate $500K annual NOI, but one has a $10M value (5% cap rate) and another has a $8M value (6.25% cap rate), the second is cheaper. But the question is: why? Maybe it has weaker tenants, shorter leases, or is in a less desirable market.

Investors must understand why cap rates differ before concluding that a high-cap-rate property is a bargain.

Using cap rate to value properties

Cap rate allows investors to quickly value properties and compare them:

Comparable market approach: If similar properties in a market trade at 5% cap rate, a property generating $500K NOI is worth approximately $10M.

Sensitivity analysis: If cap rates compress (fall to 4%), the same property becomes worth $12.5M. If cap rates expand (rise to 6%), it’s worth $8.3M.

This sensitivity to cap rate changes is why interest rates matter to real estate. When interest rates fall, cap rates tend to compress (investors accept lower yields). When rates rise, cap rates tend to expand (investors demand higher yields).

NOI quality and cap rate interpretation

Cap rate is only useful if NOI is reliable and sustainable. A property with inflated NOI (due to temporary tenants, lease rollover, or one-time income) may appear to offer an attractive cap rate, but the income may not persist.

Professional appraisers and investors must assess NOI quality:

• Lease expiration risk: Are major tenants’ leases expiring soon? Will rents reset at current market rates or decline?
• Tenant quality: Are tenants creditworthy? What is the default risk?
• Expense growth: Are operating expenses stable or accelerating?

A core property with stable, credit-grade tenants and growing rents might justify a low cap rate. A distressed property with uncertain NOI should command a higher cap rate to compensate for risk.

Unleveraged versus leveraged returns

Cap rate is the unleveraged return — what an all-cash buyer would earn. But most real estate is purchased with leverage. Leveraged returns can far exceed cap rates.

Example: A property with a 5% cap rate purchased with 60% leverage (60% debt, 40% equity) at 4.5% mortgage rate:

Annual NOI = $500,000. Interest on $6M debt at 4.5% = $270,000. Cash flow to equity = $230,000. Return on $4M equity = 5.75%.

This simple leverage amplifies the 5% unleveraged return to 5.75% on equity. With higher leverage, the equity return amplifies further (until leverage becomes a risk).

Cap rate as valuation discipline

Professional real estate investors use cap rate as a valuation anchor to avoid overpaying:

• “I will not buy this property at less than a 6% cap rate.”
• “Core properties in this market trade at 4.5%; this is 5.5%, so it’s value-priced.”

This cap-rate discipline prevents emotional or speculative bidding and forces rigorous analysis of risk and returns.

See also