Net Operating Income (NOI): The Number That Prices the Building
A property’s revenue minus its operating expenses. What counts, what stays below the line, and how one number sets the price of the building.
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Net operating income (NOI) is a property's revenue minus its operating expenses: the profit the building throws off before debt service, capital costs, and income taxes. Lenders size loans on it and buyers pay a multiple of it; at a 5 percent cap rate, every dollar of NOI is worth twenty dollars of price. The net operating income formula is simple. The judgment sits in what counts as an operating expense and what gets pushed below the line.
A commercial building is priced on what it earns after expenses, not on what it collects in rent.
Most treatments of NOI stop at the formula, and the formula is the easy part; a spreadsheet does it in one row. The intuition is what matters: picture an owner who bought the building with all cash. NOI is the profit that building hands them for running it, the rent it collects minus the cost of keeping the doors open.
What is net operating income?
Net operating income is what a building earns from running, after the cost of operating it and before any cost of owning it: no debt service, no capital projects, no income taxes. The convention is standard across the industry; Nareit's glossary carries the same definition for REITs, and it is the measure underneath nearly every headline metric in commercial real estate.
NOI is a single-year snapshot by design: an investor buying a building is buying its annual income stream, and a one-year number lets that stream be compared against anything else that produces yield, whether a bond portfolio, a private credit fund, or another building three states away. Stretch it across a five-year hold and the comparison breaks.
The metric ignores financing on purpose as well: two owners can run identical buildings, one free and clear and one levered to 75 percent, and the NOI is the same. The mortgage belongs to the building; it just sits below the NOI line.
The net operating income formula, line by line
Take a 200,000-square-foot mixed-use redevelopment running office, retail, and apartments. Rents across the three uses total $12.5 million a year. Operating expenses run $4 million. NOI is $8.5 million, and that one row is what a pro forma exists to estimate.
The revenue side is whatever the building collects: rents by use, plus parking, storage, and fee income where they exist. The operating expense side is the recurring cost of running the asset. On a building like this one, the lines look like:
- Property taxes, often the biggest single line, and heavily dependent on jurisdiction
- Insurance
- Utilities
- Repairs and maintenance, the small recurring work, not major system replacements
- Janitorial and security, roughly $200,000 a year each at this scale for cleaning crews and 24-7 coverage
- Leasing and marketing on the residential side
- Technology
- Property management, typically around 3 percent of revenue at institutional scale; over 10 percent for small buildings, and 20 percent territory for vacation rentals
- Replacement reserves, an annual set-aside for big-ticket replacements like the roof, boiler, or elevators, funded steadily so the cost never lands all at once
Benchmarks keep the estimate honest: for what Brad Hargreaves, founder of Thesis Driven, calls the main food groups, office and multifamily, operating expenses land between 25 and 40 percent of revenue; triple net industrial and retail run lower because the tenant carries the operating costs under the lease structure, and hotels run higher because the operation is the product. A modeler with no expense detail yet starts at a 40 percent operating expense ratio and refines from there; a badly run building drifts toward 50 or 60. Published expense data from BOMA and IREM, and multifamily benchmarks from RealPage and Yardi Matrix, are the standard check against a pro forma's guesses.
What stays out of NOI
The line between operating expenses and everything else is where NOI gets negotiated. Below the line sit debt service, base-building capital expenditures, tenant improvement allowances, leasing commissions, and the fees paid to the deal's manager rather than the building's.
Tenant improvements, the build-out dollars an office landlord hands a tenant to take space from white shell to occupiable, are treated as one-time costs. So are leasing commissions, which on office leases run around 6 percent of total lease value. On the mixed-use example above, commissions come to roughly $540,000 in a heavy leasing year, real cash paid to the leasing agent, and none of it touches the NOI line; analysts amortize it over the lease term instead.
The fee split is the one that trips even professionals: property management, the on-site operation, counts against NOI, while asset management, the fee the sponsor takes for running the investment, does not.
The same line is where sellers play games: a recurring expense reclassified as one-time inflates NOI, and every reclassified dollar multiplies straight into the asking price. A meaningful share of acquisition diligence is the unglamorous work of dragging those dollars back above the line.
NOI is not cash flow
Developers use the two words interchangeably, and Brad Hargreaves pushes back: “I discourage people from doing that because they are very, very different.” Interest, tenant improvements, leasing commissions, and capital expenditures all come out of cash flow but never touch NOI, which is why a stabilized building can post a healthy NOI and thin cash flow in the same year.
The distinction marks a professional boundary too: institutional and private equity owners run accrual-style books and manage to NOI, while deeper in the market, generational and family owners still run cash-basis accounting where the two numbers collapse into one. It works until the first boiler replacement lands in a single month's P&L.
How NOI sets the value of a building
A building trades at a multiple of its NOI, and the multiple is set by the cap rate: value equals NOI divided by cap rate. At a 5 cap, $8.5 million of NOI prices the building at $170 million. A cap rate, as Brad Hargreaves puts it, “tells us how much our dollar of NOI is worth.”
Anyone who has priced a business has seen the mechanic before: a cap rate is a price-to-earnings multiple flipped on its head. Real estate built its own vocabulary on top of a simple idea and made it sound harder than it is.
Convention detail that changes real money: buyers underwrite forward NOI, the next twelve months, not the trailing twelve. A sponsor valuing a year-five exit puts the cap rate on year-six NOI. Stop the model at year five and the exit comes out undervalued.
The dependence is humbling in both directions: move the exit cap rate 100 basis points against a deal and project profit can fall by roughly half with NOI exactly on target. The 2010s minted operators who missed every operating number and still posted heroic track records because cap rates compressed underneath them; the same mechanism ran in reverse on buyers who paid three-and-a-half caps for multifamily in 2021. Sector cap-rate and pricing series from Green Street and income-return decompositions from NCREIF track exactly this split between what the building earned and what the market paid for it.
The metrics built on NOI
Almost every screening number in the industry is NOI over something. Three do most of the work.
Unlevered yield on cost
NOI divided by total project cost. $8.5 million of NOI on a $100 million all-in budget is an 8.5 percent unlevered yield on cost. Developers run the equation backward: fix the yield the deal has to clear, then back-solve the price they can pay for the site. In the current rate environment, value-add deals need to clear roughly 7 to 8 percent, and opportunistic development aims for 7 to 10.
Debt service coverage ratio
DSCR, the ratio of NOI to annual debt service, is how lenders size loans; typical minimums run 1.2 to 1.3. The $8.5 million building carrying $7.08 million of debt service covers at 1.21. Then rates move and the cushion vanishes: the same loan at 5.25 percent instead of 3.75 pushes the payment to $8.45 million and coverage to 1.01, and no bank writes that loan. The sponsor does not get a smaller rate; it gets a smaller loan, sized from the NOI. The ratio follows the loan afterward too: let NOI slip below the covenant level and a borrower can sit in technical default with every payment current.
Debt yield
NOI divided by the loan amount: the lender's own cap rate on its collateral. Bridge lenders typically want 9 to 10 percent or better on stabilized numbers, and a meaningful share of loan diligence exists to confirm the NOI is what the sponsor says it is.
Where operators actually move NOI
Cap rates are set by markets nobody controls. NOI is set inside the building, which makes it the side of the valuation an operator actually drives.
The arithmetic of operational repositioning runs straight through it. A conventional apartment building renting units at $2,000 a month against $800 of per-unit operating expenses nets $1,200 a unit, roughly $14,400 a year. Furnish the same units, run them as extended-stay on monthly terms at $3,000, absorb the heavier operating load, and the number lands near $1,800 a unit, about $21,600 a year. “We're able to charge a premium because of the furniture plus the shorter term,” says Paul Stanton, partner at Thesis Driven. Half again more NOI out of the same concrete, bought with more capex and a harder operating job.
That spread is the entire investment story for operating-heavy strategies, and it is how the pitch gets written: a flex-stay operator brought in to lift NOI 30 percent with minimal capital expenditure, anchored to what the lift does to unlevered yield. Investors underwrite the claim, not the concept.
The catch is that not every dollar of NOI is valued alike. Buyers pay lower cap rates for asset classes they understand at scale, and the same income stream from a niche operating model trades at a higher one until institutions learn to price it. An operator moving NOI is really making two bets at once: that the income shows up, and that the market eventually pays full multiple for it.
Rates, caps, and spreads will do whatever they are going to do. The operators who compound through the next cycle will be the ones who treat NOI as something they build, expense line by expense line, rather than a number the market hands them.
Keep building your real estate finance stack
→ Workshops on underwriting, capital raising, and development: Thesis Driven Workshops. Live sessions with Thesis Driven on the mechanics this guide touches, from pro forma construction to raising LP capital.
→ Real Estate Finance 101, the two-day workshop this guide draws on: the property P&L, NOI, cap rates, waterfalls, and IRR, taught case-study-style.
Related reading:
What operators ask about net operating income
What is net operating income in real estate?
Short answer: Net operating income is a property's revenue minus its operating expenses: the profit the building generates before debt service, capital expenditures, and income taxes. It is the standard measure of property-level performance in commercial real estate and the number deals get priced on.
How do you calculate net operating income?
Short answer: Add every revenue line the property produces (rents, parking, fees), then subtract every recurring operating expense (property taxes, insurance, utilities, repairs and maintenance, janitorial, security, property management). A building collecting $12.5 million of revenue against $4 million of operating expenses runs an $8.5 million NOI. For office and multifamily, operating expenses typically land at 25 to 40 percent of revenue.
What does NOI stand for in real estate?
Short answer: Net operating income. The headline screening metrics (cap rate, yield on cost, DSCR, debt yield) all take it as the numerator.
Does NOI include mortgage payments or capex?
Short answer: No. NOI is measured before financing and capital costs by design, so identical buildings show identical NOI no matter how they are levered. Debt service, tenant improvements, leasing commissions, and base-building capital expenditures all sit below the NOI line.
Is net operating income the same as net income?
Short answer: No. Net income is an entity-level accounting bottom line struck after interest, depreciation, and taxes. NOI is a property-level operating figure that stops before all of those, which is why a building can show strong NOI while its ownership entity reports a net loss after depreciation and interest. NOI is an underwriting convention, not an accounting or tax line.
Is NOI the same as EBITDA?
Short answer: Close cousins, not twins. Both strip out interest, taxes, depreciation, and amortization; EBITDA is a corporate measure that absorbs company overhead, while NOI is property-specific and follows real estate conventions on reserves and one-time leasing costs.
What is a good NOI?
Short answer: NOI is an absolute dollar figure, so “good” only means something relative to revenue and cost. Two screens do most of the work: an operating expense ratio around 25 to 40 percent of revenue for office and multifamily, and an unlevered yield on cost (NOI over total project cost) that clears borrowing rates with room to spare, roughly 7 to 8 percent for value-add deals in the current environment. Market-level context lives in expense benchmarks from JLL and the multifamily data providers.
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