To protect a person with a property interest in real property against a loss of market value thereof, a base market value of the real property is determined at a current time when the property interest in the real property arises or thereafter, and a number of types of events that cause the real property to lose market value as compared with the base market value are defined. A number of the defined types of events are selected, and a real estate market value policy is issued to the person at about the current time. The policy promises to compensate the person for any loss experienced by the person if the real property loses market value as compared with the base market value based on any of the selected types of events.