Cap Rate Compression

How cap rate compression works

A cap rate is a property's net operating income divided by its price. Rearrange the same formula and it becomes a valuation formula:

Value = Net Operating Income ÷ Cap Rate

That inversion is the whole mechanism. When the market-wide cap rate for a property type falls, the divisor shrinks and value rises, whether or not a single lease changed. Compression is not a statement about one building. It describes what buyers across a market are willing to accept as a starting yield on that type of asset, and it shows up as prices climbing faster than rents and net income.

The reverse is cap rate expansion: cap rates rise, the divisor grows, and values fall. Both are moves in the market's required return, not in the property's earnings.

Worked example: the same building at five cap rates

Take a stabilized small retail building bought for $2,000,000 with $1,400,000 of financing, a 70% loan-to-value ratio. At a 7.0% cap rate, that price implies $140,000 of NOI. Hold the income at $140,000 and change only the market's cap rate:

Market cap rate	Value ($140,000 ÷ cap rate)	Change from $2,000,000	$1,400,000 loan as % of value
5.0%	$2,800,000	+40.0%	50.0%
6.0%	$2,333,333	+16.7%	60.0%
7.0%	$2,000,000	—	70.0%
8.0%	$1,750,000	−12.5%	80.0%
9.0%	$1,555,556	−22.2%	90.0%

Two things stand out. First, nothing about the building changed from row to row, yet the owner's equity swings from $1,400,000 at the top of the table to $155,556 at the bottom. Second, the effect is lopsided. A one-point compression from 7% to 6% adds $333,333 of value; a one-point expansion to 8% removes $250,000. You can run your own pairs in the cap rate calculator.

Income growth versus compression

Property values move for two separate reasons, and it helps to keep them apart:

• NOI growth — higher rents, lower vacancy, or lower operating costs. This is earned by operating the property.
• Cap rate change — the market repricing the same income. This is not earned; it happens to every owner of that asset type at once.

Combine them with the same building. If NOI grows 3% to $144,200 and the cap rate compresses from 7.0% to 6.0%, value becomes $144,200 ÷ 0.06 = $2,403,333, up 20.2%. If the same NOI growth happens while cap rates expand to 8.0%, value is $144,200 ÷ 0.08 = $1,802,500, down 9.9%, even though the owner did everything right. An owner who sold in the first case and an owner who held in the second experienced the same operating performance and very different results.

What drives compression

• Falling interest rates. Cap rates and long-term interest rates tend to move in the same direction, though not one-for-one. Cheaper debt lets buyers pay more for the same income and still earn a return on their equity.
• Capital looking for a home. When many buyers compete for a limited number of properties, the price is bid up and the yield falls.
• Expected rent growth. A buyer who expects income to rise will accept a lower starting yield. The cap rate then reflects the future more than the present.
• Lower perceived risk. Better tenant credit, longer leases, or a property type that has come into favor all lower the return investors demand.

Compression is also not uniform. Cap rates vary by property type, market and quality, and one asset class can compress while another does not. Be careful with any single “market cap rate” quoted without a property type, location and date, because the number only has meaning for comparable properties.

Compression and the appraisal

An appraisal of an income property usually applies a cap rate drawn from recent comparable sales. Compression in the market therefore reaches appraised values with a lag, and a reversal reaches them the same way. A lender who orders an appraisal after cap rates have moved can see a very different value from the one in your purchase contract.

Why lenders care

A lender is lending against value but repaid from income, and cap rate compression changes only the first of those.

• It can raise loan proceeds on LTV. A bank commercial loan typically runs 65–75% (80% multifamily) of value, so a higher appraisal means a larger allowable loan. At 6.0%, the building above is worth $2,333,333 and a 70% loan is $1,633,333, which is $233,333 more than the existing $1,400,000 balance. That difference is the cash-out proceeds on a cash-out refinance.
• It does not raise the income-based limits. Debt yield divides NOI by the loan amount and DSCR divides NOI by the payment. Neither includes the cap rate, so a lender that sizes on either one will not lend more just because the market compressed. The cap-rate-driven value and the income-driven loan limit can end up far apart.
• It makes a lender examine the exit. Some underwriters test a loan at a higher cap rate than the one used to buy, because the loan matures later and the market may have moved back. A deal that works only at today's compressed cap rate is thinner than it looks.

The refinance risk when compression reverses

This is the part of the topic that costs borrowers money. A loan sized when cap rates were low must be refinanced when it matures, and the refinance is underwritten on the cap rate at that time.

Return to the $2,000,000 building. The $1,400,000 loan matures after cap rates have expanded from 7.0% to 8.0% and NOI is unchanged at $140,000:

• Value is $140,000 ÷ 0.08 = $1,750,000.
• The existing loan is now 80% of value ($1,400,000 ÷ $1,750,000).
• A new lender limited to 70% LTV will offer $1,225,000.
• The gap is $175,000, which the borrower must cover with new equity, a second source of capital, or an extension.

The debt yield test points the same way. $140,000 ÷ $1,225,000 is 11.4%, while the original $1,400,000 loan carried a debt yield of exactly 10.0%. The debt yield rises to 11.4% only because the new loan is smaller; the gap comes entirely from the lower value, since the leverage limit is the same 70%. Our article on the commercial real estate maturity wall covers how this plays out across a large group of loans coming due together.

What to watch for

• Underwrite the exit at a higher cap rate than the entry. A common discipline is to assume the sale or refinance happens at a cap rate equal to or above today's, then check whether the deal still works. If it only works with further compression, the plan depends on the market, not on the property.
• Separate earned from unearned gains. When you look at how much a property has appreciated, split it into NOI growth and cap rate change. Only the first one is something a new buyer can see in the operating statement.
• Be careful with pro forma values. A projected sale price built on a lower cap rate than today's is an assumption of compression. Ask what the value is at the current cap rate.
• Match the loan term to the exit. A short-term loan taken near the top of a compressed market has the least time for rates to move back. A value-add business plan should work at a flat cap rate.
• Ask the lender how it sizes. If proceeds are limited by debt yield or DSCR, a higher appraisal will not increase them, and the effort belongs on NOI.
• Use comparable sales, not headlines. The cap rate that matters for your property is the one paid for similar assets nearby, not a national average.

If you are planning a purchase or refinance and want to see how much of the number depends on the cap rate, bring us the operating statement and the appraisal assumptions and we will show you which test sets the loan. For the basics behind the formula, read cap rates explained, and see permanent financing for how long-term loans are sized.

Sources: all dollar figures above are arithmetic on the stated assumptions ($140,000 NOI, $2,000,000 price, $1,400,000 loan). Definitions of cap rate compression: Barnes Walker legal glossary; Wall Street Prep, “What is Cap Rate Compression?”; Matthews, “What Are Cap Rates?”.