$23$ Determine the ownership status for the scenario below.

Ewan grants property he owns to his nephew on the condition the nephew renovates the fixtures on the property by the end of the next year. If Ewan's nephew never finishes the renovations, the property will automatically revert back to Ewan. What type of ownership does Ewan's nephew have?

Fee simple absolute

Fee simple subject to a condition subsequent

Fee simple determinable

Life estate