What is a life estate characterized by ownership lasting only for the duration of a designated party's lifetime called?

A life estate characterized by ownership lasting only for the duration of a designated party's lifetime is referred to as "pur autre vie." This term specifically indicates that the life estate is based on the life of someone other than the life tenant. For example, if a property is granted to one party for the life of another person, that is a "pur autre vie" arrangement. The key aspect of this type of estate is that the duration of ownership is not just for the life of the initial owner but is tied to the life of another individual, which can add complexity to the estate’s management and eventual transfer when the designated person's life ends.

In contrast, a legal life estate generally refers to a life estate that is created by law, often for the benefit of a spouse or family member, while the term "life estate" is more generic and does not specify the relationship to another individual's life. Remainder interest refers to the future interest in the property once the life estate ends. While all of these terms relate to life estates, "pur autre vie" distinctly captures the essence of an estate based on someone else's life.