Words of Limitation:
so long as the property is used as a public library
until the property ceases to be used as a public library
during the time or while the property is used as a public library
or similar language indicating that "upon the happening of a stated event the land is to [automatically] revert to the grantor." (casebook p. 291)
Words of condition
on condition that the property not be used for commercial purposes
provided that the property be used for single-family residential purposes only
