Fee Simple Defeasible – an estate that ends because there are no more heirs of the person to whom it is granted or because a special limitation, condition subsequent, or executory limitation takes effect. — aka defeasible fee simple; qualified fee.

Fee Simple Determinable – an estate that will automatically end and revert to the grantor if some specified event occurs. — aka determinable fee; qualified fee; fee simple subject to common-law limitation; fee simple subject to special limitation; fee simple subject to special interest; base fee; estate on limitation. [1]

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