What is Capitalization Rate?

Alternative Forms: Cap rate
Legal Definition
Capitalization rate (or “Cap Rate”) is a real estate valuation measure used to compare different real estate investments. Although there are many variations, a cap rate is often calculated as the ratio between the net operating income produced by an asset and the original capital cost (the price paid to buy the asset) or alternatively its current market value.
-- Wikipedia
Legal Definition
The capitalization rate, often just called the cap rate, is the ratio of Net Operating Income (NOI) to property asset value. So, for example, if a property was listed for $1,000,000 and generated an NOI of $100,000, then the cap rate would be $100,000/$1,000,000, or 10%