Key Takeaways
- A cap rate is just NOI divided by price. It tells you the unlevered yield, not the total return, and it should never be the only number you look at
- A lower cap rate doesn't mean a worse deal. It usually reflects lower risk or stronger growth expectations
- Value-add returns come from the spread between your going-in cap rate and the stabilized cap rate, not from hoping the market compresses
- Rebuild the NOI from scratch using your own numbers. Never underwrite off a broker's proforma
If you've spent ten minutes looking at commercial real estate, someone has quoted you a cap rate. It's the first number brokers mention, the first line in every offering memorandum, and probably the most misunderstood metric in the business. Cap rates are useful — but only if you understand what they're actually telling you, and more importantly, what they're leaving out.
The Basic Math
A cap rate is simple division: Net Operating Income ÷ Purchase Price = Cap Rate. If a property generates $80,000 in NOI and you buy it for $1,000,000, you're buying at an 8% cap rate. It represents your unlevered yield — the return you'd earn if you paid all cash.
In practice, nobody pays all cash. But the cap rate gives you a standardized way to compare properties regardless of financing. It strips out leverage and lets you evaluate the underlying asset on its own merits. That's its strength. Its weakness is everything it doesn't tell you.
What Cap Rates Actually Measure
A cap rate is a snapshot of risk-adjusted yield at a moment in time. Lower cap rates mean investors are willing to accept lower current yields, typically because they perceive lower risk or expect higher future growth. A Class A apartment building in Miami might trade at a 4.5% cap rate because investors believe rents will grow, the location is irreplaceable, and the tenant base is deep. A 30-unit walkup in a secondary market might trade at an 8% cap rate because the rent growth story is less certain and the buyer pool is smaller.
| Asset Class | Typical Cap Rate Range | Notes |
|---|---|---|
| Class A Multifamily (gateway) | 4.0%–5.0% | Institutional quality, newer vintage, core locations |
| Class B Multifamily (value-add) | 5.5%–7.5% | 1970s–1990s vintage, renovation opportunity |
| Class C Multifamily (workforce) | 6.5%–9.0% | Significant deferred maintenance, below-market rents |
| Single-Tenant NNN Retail | 5.0%–7.0% | Highly dependent on tenant credit quality |
| Midwest Industrial | 6.5%–8.5% | Distribution/logistics, longer lease terms |
Approximate ranges based on NCREIF, Real Capital Analytics, and CoStar data (2023–2024). Actual cap rates vary by market, vintage, and condition.
A cap rate tells you what the market thinks about a property today. It doesn't tell you whether the market is right.
This is where most people stop. They look at the cap rate, compare it to a benchmark, and decide whether something is "cheap" or "expensive." That's a dangerous oversimplification.
What Cap Rates Don't Tell You
The NOI in a cap rate calculation is usually trailing or pro forma. Neither is the whole story. Trailing NOI reflects what happened — but what happened might include deferred maintenance that suppressed expenses, or below-market rents that a new owner could raise. Pro forma NOI reflects what the seller hopes will happen, which may or may not be realistic.
A property with a 6% cap rate on trailing NOI and $200,000 in deferred maintenance is a completely different investment than a property with a 6% cap rate and a new roof. The cap rate treats them identically. It doesn't account for capital expenditure requirements, upcoming lease expirations, insurance cost trends, property tax reassessment risk, or any of the dozen things that will affect actual returns.
How Operators Use Cap Rates
In underwriting, cap rates are a screening tool, not a decision-maker. If a garden-style walkup in a workforce housing market is listed at a 4% cap rate, it is probably mispriced for a value-add strategy. At a 7.5% cap rate, it merits a deeper look.
The real work happens below the cap rate. Experienced operators rebuild the NOI from scratch: their own rent comps, their own expense assumptions, their own construction cost data. They calculate what the cap rate would be after completing the renovation plan and stabilizing the property. The spread between the going-in cap rate and the stabilized cap rate is where the value-add strategy lives.
Worked Example: Value-Add Cap Rate Mechanics
A neglected 20-unit property, current rents averaging $1,100/unit:
Current gross rent: 20 × $1,100 × 12 = $264,000
Operating expenses (45%): −$118,800
Current NOI: $145,200
Purchase price: $1,936,000
Going-in cap rate: $145,200 ÷ $1,936,000 = 7.5%
After renovation ($12,000/unit), rents increase to $1,400/unit:
Stabilized gross rent: 20 × $1,400 × 12 = $336,000
Operating expenses (43%): −$144,480
Stabilized NOI: $191,520
Market cap rate for renovated product: 6.0%
Implied value: $191,520 ÷ 0.06 = $3,192,000
Total capital invested: $1,936,000 + $240,000 (renovation) = $2,176,000
Value created: $3,192,000 − $2,176,000 = $1,016,000
The property appreciated not because the market moved, but because the operator changed the
underlying asset.
Cap Rates and Interest Rates
People love to draw a straight line between interest rates and cap rates. The logic seems obvious: if borrowing costs go up, cap rates should go up too. And directionally, that's true. But the relationship is much messier than the theory suggests.
The spread between cap rates and the 10-year Treasury is what matters more than either number in isolation. Historically, that spread has ranged from 150 to 400 basis points depending on the asset class and market conditions. In the workforce housing segment we focus on, cap rate spreads have remained relatively stable even through the recent rate cycle, because the fundamentals — deep renter demand, constrained supply — support values independently of financing conditions.
The Bottom Line
Cap rates are useful shorthand. They let you compare properties quickly, track market trends, and communicate with other investors in a shared language. But they are a starting point for analysis, not the analysis itself. The investors who get burned are the ones who buy a cap rate instead of buying a property.