Final answer:
A fee simple subject to a condition subsequent has been granted, which allows the preschool to use the land indefinitely as a playground, with the original owner retaining the right of reentry if the condition is breached.
Step-by-step explanation:
The property owner has granted a fee simple subject to a condition subsequent. This is a type of estate that grants the holder full ownership of a property under the condition that it is used for a specific purpose, in this case, as a playground for a preschool. The key feature of this estate is the right of reentry, which the original owner retains, allowing them to retake possession of the property if the condition is violated. Unlike a leasehold, there is no set term for the estate and the preschool could potentially use the land indefinitely, provided the condition is met. It is distinct from a fee simple absolute, which is an unrestricted ownership right, and from a courtesy, which is a legal estate given to a surviving husband.