A qualified estate in which the grantee could lose his or her interest upon the occurrence or non-occurrence of a specified event. There are two types of defeasible fee estates: (1) Those known as a condition subsequent where the possibility of re-entry takes place, and (2) A qualified limitation, where the grantee’s ownership automatically ends with the possibility of reverter (otherwise known as a fee simple determinable). The words as long as, while, or during are key to creating a qualified limitation defeasible fee estate.