Why It Matters
Here's why spread matters more than the absolute rate itself. When the 10-year Treasury yields 4.5% and a comparable market cap rate is 6.5%, the spread is 200 basis points. That 200-point cushion represents the extra return the market demands to take on real estate risk over risk-free government bonds. When that spread compresses to 50 or 75 basis points, buyers are paying up — accepting less risk compensation than history suggests is warranted. When it widens to 300 or 350 basis points, real estate is cheap relative to the alternative. The same logic applies to mortgage spreads: lenders typically price home loans at 150–200 basis points over the 10-year Treasury. When that spread blows out to 300 basis points, as it did in 2022–2023, borrowing costs rise faster than the raw Treasury move suggests. You can track every leading indicator in real estate with one tool — the spread — once you understand what it's measuring and what moves it.
At a Glance
- What it measures: The difference between two interest rates or yields, showing relative value and risk compensation
- Units: Percentage points or basis points (1 percentage point = 100 basis points)
- Cap rate spread: Cap rate minus 10-year Treasury yield — the risk premium the market demands to own real estate
- Mortgage spread: 30-year fixed rate minus 10-year Treasury — the lender's margin for credit risk and servicing costs
- Normal cap rate spread: Historically 150–300 basis points above the 10-year Treasury in most asset classes
- Normal mortgage spread: Historically 150–200 basis points over the 10-year Treasury
- Narrowing spread: Market overheating — buyers accepting less risk compensation
- Widening spread: Market stress or opportunity — investors demanding more premium to deploy capital
How It Works
The cap rate spread tells you whether real estate is cheap or expensive. Cap rate is net operating income divided by property price — a measure of property yield independent of financing. The 10-year Treasury yield is the baseline return on risk-free government bonds. The spread between them is the risk premium investors require to own something illiquid, management-intensive, and cyclically sensitive. A 250-basis-point spread means real estate yields 2.5 percentage points above Treasuries — historically reasonable compensation for those risks. When that spread compresses toward zero, as it did in some markets in 2020–2021 when nominal rates dropped sharply, buyers were effectively accepting near-zero risk premium. Assets priced that way are vulnerable when rates normalize: if the 10-year rises 150 basis points and cap rates don't expand correspondingly, property values decline.
The mortgage spread reveals lender behavior, not just Fed policy. Most borrowers watch the federal funds rate and assume mortgage rates move in lockstep. They don't — and the difference is the mortgage spread. Lenders price 30-year mortgages relative to the 10-year Treasury, not the overnight rate, because they hold long-duration assets funded by shorter-duration liabilities. In normal conditions, that spread runs 150–200 basis points. But in periods of market stress, refinancing surges, or rate volatility, lenders widen their spreads to protect against prepayment risk and pipeline hedging costs. In late 2023, the 10-year Treasury hovered near 4.7%, but 30-year mortgage rates approached 8% — a spread of roughly 315 basis points, far above the historical norm. This explained why mortgage rates stayed punishing even as the Fed signaled rate cuts: the problem wasn't just nominal rates at the short end; it was the widened lender margin built into every new loan.
The inverted yield curve distorts both spreads simultaneously. When short-term rates exceed long-term rates, the reference term premium embedded in the 10-year yield compresses. Cap rates calculated against an artificially low long-term yield can look expensive even when the absolute rate is still moderate. The real interest rate — the nominal rate minus inflation expectations — also feeds spread calculations: when real rates rise sharply, the risk-free baseline rises and compresses the risk premium that cap rates offered at prior prices.
Spread changes move markets faster than rate changes. A 25-basis-point Fed hike gets headlines. But a 50-basis-point expansion in the mortgage spread — which can happen with no Fed action at all — produces an equivalent or larger increase in actual borrowing costs. Investors who track only the federal funds rate miss half the picture.
Real-World Example
Marissa is underwriting a small multifamily purchase in a secondary market. The property's stabilized NOI is $67,400, and the seller is asking $1,050,000. That implies a cap rate of 6.4%.
She pulls the current 10-year Treasury yield: 4.3%. The spread between her deal's cap rate and the risk-free rate is 210 basis points. Her research shows that this submarket has historically traded at 250–300 basis points over the 10-year. At 210 basis points, the deal is priced at the thin edge of what the market has historically required for risk compensation.
She runs the mortgage side: the prevailing 30-year rate is 7.1%. The 10-year Treasury is at 4.3%, so the mortgage spread is 280 basis points — elevated versus the historical 175-point norm. She notes that if mortgage spreads normalize back to 175 basis points with an unchanged 10-year yield, rates would fall to around 6.05% — meaningfully better refinancing conditions in 2–3 years.
Her conclusion: the deal is priced full on the cap rate spread and isn't a screaming value, but the elevated mortgage spread suggests future refinancing upside if credit conditions normalize. She negotiates the price to $985,000 — a 6.85% cap rate and a 255-basis-point spread over Treasuries — which sits inside the historical range. At that price, the spread compensates her appropriately for the risk she's taking.
Pros & Cons
- Reveals relative value — An absolute cap rate of 6% means nothing without context; a 250-basis-point spread over Treasuries tells you exactly where the market stands on risk compensation
- Signals cycle position — Compressing spreads indicate late-cycle overheating; widening spreads signal stress or early-stage opportunity, often before transaction volumes or headlines reflect the shift
- Isolates lender behavior — Tracking the mortgage spread separately from the 10-year Treasury lets you distinguish between Fed policy effects and credit market stress affecting borrowing costs
- Free, publicly available data — The 10-year Treasury yield, current cap rate surveys, and mortgage rate indexes are all published daily at no cost through FRED, Green Street, and Freddie Mac
- Varies by market and asset class — A 200-basis-point spread is thin for Class C apartments in a small market but reasonable for Class A industrial in a major hub; there is no universal "correct" spread across all property types
- Historical averages shift — The 150–200 basis point mortgage spread norm was built over decades that included different inflation regimes, Fed policy frameworks, and banking structures; post-2020 conditions may establish a new structural baseline
- Doesn't predict timing — A spread that looks unsustainably thin can persist for years before mean-reverting; knowing the spread is compressed doesn't tell you when the correction arrives
- Cap rate data lags reality — Published cap rate surveys reflect closed transactions from 60–180 days prior; in fast-moving rate environments, the current true market spread may differ from the published figures
Watch Out
A narrowing spread is not the same as a bad deal. Spreads can compress because fundamentals are genuinely strong — high occupancy, rent growth, limited new supply — not just because buyers are irrational. The compression becomes dangerous when it's driven by cheap capital rather than operating performance. Before concluding a deal is overpriced based on a thin spread, verify whether the NOI and rent assumptions justify the valuation on their own terms.
Don't track only one spread. The cap rate spread and the mortgage spread can move in opposite directions. In 2022–2023, cap rate spreads widened (property prices fell relative to rising Treasury yields) while mortgage spreads also widened (borrowing cost rose faster than the 10-year alone would suggest). Both signals mattered, and focusing on just one would have given an incomplete picture of market conditions. Cross-referencing the inverted yield curve and term premium data alongside spread analysis builds a fuller model.
Widening mortgage spreads can persist through a rate-cutting cycle. When the Fed begins cutting the federal funds rate, borrowers often expect mortgage rates to fall quickly. But if the mortgage spread stays elevated — because lenders remain cautious or prepayment risk pricing stays high — actual mortgage rates may fall much more slowly than the rate-cut headlines imply. The 10-year Treasury yield and the mortgage spread are two separate levers, and the Fed only controls one of them.
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The Takeaway
Yield spread is one of the few tools that simultaneously tells you how the market is pricing risk, where lenders are positioning themselves, and where real estate stands relative to competing asset classes. Track the cap rate spread to assess whether property prices offer adequate risk compensation above the risk-free rate. Track the mortgage spread to separate Fed policy effects from lender behavior. When both spreads widen simultaneously, capital deployment opportunities improve. When both compress, tighten your underwriting and stress-test your exit assumptions. Understanding spread is the difference between knowing rates went up and understanding what those rates actually mean for your deals.