How does the income approach to real estate valuation work, and what determines cap rates?
I'm studying real estate valuation for CFA Level I and I know there are three approaches: cost, income, and sales comparison. The income approach using cap rates seems most important. Can someone explain how to calculate NOI, apply a cap rate, and what drives cap rates higher or lower?
The income approach is the most common method for valuing income-producing commercial real estate. It converts a property's income stream into a value estimate.
Step 1: Calculate Net Operating Income (NOI)
NOI represents the property's income after all operating expenses but before financing costs and taxes.
| Line Item | Amount |
|---|---|
| Potential Gross Income (PGI) | $1,200,000 |
| Less: Vacancy & collection loss (8%) | -$96,000 |
| Effective Gross Income (EGI) | $1,104,000 |
| Less: Operating expenses | -$441,600 |
| Net Operating Income (NOI) | $662,400 |
Operating expenses include: property taxes, insurance, maintenance, property management fees, utilities (if landlord-paid), reserves for replacement.
Operating expenses exclude: mortgage payments (debt service), depreciation, income taxes, capital expenditures.
Step 2: Apply the Cap Rate
Value = NOI / Cap Rate
If the market cap rate for similar office properties is 6.5%:
Value = $662,400 / 0.065 = $10,190,769
What Determines Cap Rates?
The cap rate is essentially the required yield investors demand for holding a property. It's influenced by:
| Factor | Higher Cap Rate | Lower Cap Rate |
|---|---|---|
| Property quality | Class B/C, older | Class A, new |
| Location | Suburban, secondary market | Prime CBD |
| Tenant quality | Small, short leases | Credit tenants, long leases |
| Interest rates | Rising rate environment | Low rate environment |
| Market liquidity | Illiquid markets | Deep, liquid markets |
| Growth potential | Low rent growth expected | Strong rent growth expected |
Key Insight: Lower cap rates mean higher valuations. A Class A office building in Manhattan might trade at a 4% cap rate ($662,400 / 0.04 = $16.6M), while the identical NOI in a secondary market might warrant a 7.5% cap rate ($662,400 / 0.075 = $8.8M).
Cap Rate vs. Discount Rate:
- Cap rate applies to a single year's NOI (a simplified, static measure)
- Discount rate is used in DCF analysis to discount projected future cash flows
- Relationship: Cap rate approx = Discount rate - NOI growth rate
- If the discount rate is 9% and NOI growth is 2.5%: Cap rate approx = 6.5%
Exam tip: CFA Level I problems typically give you PGI, vacancy rate, operating expenses, and a cap rate, then ask for property value. Be careful not to subtract debt service from NOI — that's the most common mistake. Also remember: lower cap rate = higher value = lower risk.
Explore more real estate valuation techniques in our CFA Level I alternatives section on AcadiFi.
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