A life estate will last until what event occurs?

A life estate is a type of property ownership that lasts for the duration of a specific individual's life, known as the "measuring life." Consequently, the correct answer indicates that a life estate will terminate upon the death of this individual. Once the measuring life passes away, the rights to the property revert either to the grantor or to another designated party, known as the remainderman.

This structure ensures that the property is not transferred indefinitely but only for the lifetime of an individual, allowing them to use and enjoy the property during their lifetime while providing clarity about what happens to the property after their death. Therefore, the defining event that ends a life estate is indeed the death of the measuring life.