What type of estate is held "so long as" a condition is maintained?

The type of estate held "so long as" a condition is maintained is known as a Fee Simple Determinable. This form of estate automatically terminates upon the occurrence or non-occurrence of a specified condition. The phrase "so long as" indicates that the ownership is contingent upon the continuation of a particular use or condition. For example, if a property is granted to an entity "so long as" it is used for educational purposes, the estate will automatically revert to the grantor if the property ceases to be used for that purpose.

In contrast, a Fee Simple Subject to a Condition Subsequent does not automatically terminate on the breach of the condition but allows the grantor the right to reclaim ownership through re-entry. A Fee Simple Absolute represents complete ownership without limitations, and a Life Estate allows ownership for the duration of a specified person's life, which does not involve conditions tied to the estate's continuation. Thus, the Fee Simple Determinable's characteristics of automatic reversion upon condition failure align precisely with the concept of "so long as."