Operating expense ratio compares a property's total operating expenses to its effective gross income, expressed as a percentage. It offers a quick read on how efficiently a building is being managed relative to the revenue it produces, since two properties with identical rent rolls can post very different net operating income figures depending on how tightly expenses are controlled.
Ratios vary considerably by property type. Multifamily and industrial assets tend to run leaner, often in the 35 to 45 percent range, while properties with heavier common-area and service demands, such as full-service hotels, can run well above that. Rising operating expense ratios over time can signal deferred maintenance catching up with a property, inflation outpacing rent growth, or simply inefficient management, making the metric a useful early warning sign for investors tracking a property's performance year over year.
Further reading: Do Interest Rates Really Drive Cap Rates? What Investors Need to Know
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