The term “fee simple determinable” refers to an estate that automatically terminates and is reverted back to the grantor if certain event specified in the grant occurs.  For instance, the following language grants a fee simple determinable interest in the property to John and his heirs: “to John and his heirs while the property is used for charitable purposes.”  As soon as the property starts being used for non-charitable purposes, the interest is reverted back to the grantor.

In fee simple determinable, the grantor continues to retain future interest in the property that is referred to as the “possibility of reverter.”

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