Which type of estate does not end automatically when a stated event or condition occurs?

The correct choice is Fee simple subject to a condition subsequent. This type of estate allows the property owner to retain a right of entry if a specified condition is violated. Unlike other forms of ownership, such as a life estate or a leasehold estate, which automatically terminate upon certain events—such as the death of the life tenant or the expiration of the lease—a fee simple subject to a condition subsequent does not automatically end. Instead, it remains in effect until the former owner takes action to reclaim the property after the specified condition is not met.

This means that while the estate may be affected by certain events, it does not cease to exist without intervention by the grantor. Understanding this distinction is crucial in real estate law, especially for those involved in transactions or inheritance, as it could impact the rights and obligations associated with the property.