Net Operating Income

Net operating income is the foundational metric in commercial real estate analysis. It tells investors and lenders how much cash a property generates from its operations independent of how it is financed, making it comparable across properties with different capital structures.

Revenues included in NOI typically consist of base rent, percentage rent (common in retail leases where tenants pay additional rent tied to sales), ancillary income such as parking fees, laundry income, and telecommunications fees, and recoveries of operating expenses from tenants under gross or net lease structures.

Operating expenses subtracted from revenues include property management fees, real estate taxes, insurance, utilities paid by the landlord, repairs and maintenance, and administrative costs. Debt service (principal and interest payments), capital expenditures for property improvements, and depreciation are explicitly excluded — which is why NOI is also called an unlevered, pre-debt metric.

NOI feeds directly into the capitalization rate formula. If the cap rate for comparable properties in a market is known, dividing NOI by the cap rate yields an indication of the property's market value. Conversely, dividing the purchase price into NOI yields the cap rate the buyer is accepting, which can be compared to market benchmarks and to alternative investment returns.

NOI is also a key input in debt service coverage ratio (DSCR) calculations, which lenders use to size and approve commercial mortgage loans. A property with insufficient NOI relative to its debt service obligations represents a heightened credit risk.

Investors should examine NOI quality carefully. High vacancy that is temporarily filled by concessions, above-market leases that are expiring soon, or deferred maintenance that will require near-term capital spending can all inflate current NOI relative to sustainable run-rate income.