Michigan Compiled Laws, Chapter 554. Real and Personal Property § 554.72

Sec. 2. (1) Subject to section 5,  1 a nonvested property interest is invalid unless 1 or more of the following are applicable to the interest:

(2) Subject to section 5, a general power of appointment not presently exercisable because of a condition precedent is invalid unless 1 or more of the following are applicable to the power:

(3) Subject to section 5, a nongeneral power of appointment or a general testamentary power of appointment is invalid unless 1 or more of the following are applicable to the power:

(4) In determining whether a nonvested property interest or a power of appointment is valid under subsection (1)(a), (2)(a), or (3)(a), the possibility that a child will be born to an individual after the individual's death is disregarded.

(5) If, in measuring a period from the creation of a trust or other property arrangement that was irrevocable on September 25, 1985, language in an instrument governing the effect of an exercise of a power of appointment over property exempt from federal generation skipping transfer tax (a) seeks to disallow the vesting or termination of any interest or trust beyond, (b) seeks to postpone the vesting or termination of any interest or trust until, or (c) seeks to operate in effect in any similar fashion upon, the later of (i) the expiration of a period of time ending with, or not exceeding 21 years after, the death of the survivor of specified lives in being at the creation of the trust or other property arrangement or (ii) the expiration of a period of time that exceeds or might exceed 21 years after the death of the survivor of lives in being at the creation of the trust or other property arrangement, that language is inoperative to the extent it produces a period of time that exceeds 21 years after the death of the survivor of the specified lives.