Massachusetts General Laws
Chapter 184a - Statutory Rule Against Perpetuities
Section 7 - Fee Simple Determinable in Land or Fee Simple Subject to Right of Entry for Condition Broken; Term

Section 7. A fee simple determinable in land or a fee simple in land subject to a right of entry for condition broken shall become a fee simple absolute if the specified contingency does not occur within thirty years from the date when such fee simple determinable or such fee simple subject to a right of entry becomes possessory. If such contingency occurs within said thirty years the succeeding interest, which may be an interest in a person other than the person creating the interest or his heirs, shall become possessory or the right of entry exercisable notwithstanding the rule against perpetuities.

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