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Valuation Term

Cap Rate

Cap rate explained for Westside apartment owners reviewing valuation and buyer underwriting.

By Don Favia · Updated July 3, 2026

Direct Answer

A cap rate is the relationship between a building's net operating income and its value. The basic formula is NOI divided by price. In practice, buyers use cap rates to compare yield, risk, location, rent control, condition, and growth potential across apartment buildings.

Why It Matters to Sellers

A small cap rate difference can move value by hundreds of thousands of dollars. That is why the right comparable set matters. A Santa Monica building, a Palms building, and a West LA building may trade differently even with similar income.

Buyer Underwriting Impact

Buyers use cap rate to price income and risk. They may accept a lower cap rate for a stronger location or cleaner building, and demand a higher cap rate for deferred maintenance, uncertain expenses, or limited rent growth.