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Net Operating Income (NOI) is the most fundamental metric in commercial real estate valuation. It measures a property's income after subtracting vacancy losses and operating expenses, but before mortgage payments, income taxes, depreciation, and capital expenditures.
NOI is the basis for nearly every CRE valuation method. Cap rate, a property's most common pricing metric, is simply NOI divided by property value. Lenders use NOI to calculate debt service coverage ratio (DSCR). Investors use NOI to compare properties across markets, asset classes, and price points.
The formula has three components:
NOI = Gross Rental Income × (1 - Vacancy Rate) - Operating Expenses
Gross Rental Income is the total scheduled rent if every unit is occupied at market rate for the full year. This includes base rent plus any ancillary income like parking, laundry, or storage fees.
Vacancy Rate accounts for income lost when units are empty or tenants default. Industry standard is 5-10%, but it varies by market and property type. Subtracting vacancy from gross income gives you Effective Gross Income (EGI).
Operating Expenses include property taxes, insurance, property management fees, maintenance and repairs, utilities (if owner-paid), landscaping, and administrative costs. They do not include mortgage payments, capital improvements, or depreciation.
For example: a property with $240,000 gross income, 5% vacancy, and $72,000 in expenses has an NOI of $156,000. The effective gross income is $228,000, and the NOI margin is 65%.
NOI Margin = NOI / Gross Rental Income × 100
NOI margin tells you what percentage of gross income the property retains after vacancy and expenses. It's a measure of operating efficiency. Higher margins mean the property keeps more of every dollar collected.
NOI margins vary significantly by asset class. Properties with lower management intensity and fewer operating costs (like industrial) tend to have higher margins:
| Property Type | Typical NOI Margin | Key Driver |
|---|---|---|
| Industrial / Warehouse | 60% - 75% | NNN leases, low mgmt costs |
| Multifamily (Class A) | 55% - 70% | Scale, amenity revenue |
| Multifamily (Class B/C) | 45% - 60% | Higher turnover, more repairs |
| Retail (NNN Leased) | 55% - 70% | Tenant pays expenses |
| Retail (Gross Lease) | 40% - 55% | Owner pays expenses |
| Office (CBD) | 55% - 68% | Long leases, TI amortized |
| Office (Suburban) | 45% - 60% | Higher vacancy, shorter leases |
| Self-Storage | 55% - 70% | Low labor, high automation |
NOI and cash flow are not the same thing. NOI measures property-level performance before financing. Cash flow subtracts debt service (mortgage payments) from NOI:
Cash Flow = NOI - Annual Debt Service
A property can have strong NOI but negative cash flow if it's highly leveraged. Conversely, a low-NOI property bought in cash generates cash flow equal to its NOI. This is why investors analyze both: NOI tells you about the property; cash flow tells you about the deal.
NOI is the foundation of commercial real estate analysis because it isolates the property's operating performance from financing decisions. Two investors can buy the same property with different loan structures, but the NOI is identical. This makes NOI the universal comparison metric.
Banks use NOI to underwrite loans. Appraisers use NOI to value properties. Investors use NOI to screen deals. If you only learn one CRE metric, make it NOI.