Michigan Compiled Laws, Chapter 450. Corporations § 450.4501

(a) If an operating agreement includes requirements for admission, by complying with those requirements.

(b) If an operating agreement does not include requirements for admission, if either of the following are met:

(c) In any manner established in a written agreement of the members.

(a) If the person is acquiring a membership interest directly from the limited liability company, by complying with the provisions of an operating agreement prescribing the requirements for admission or, in the absence of provisions prescribing the requirements for admission in an operating agreement, upon the unanimous vote of the members entitled to vote.

(b) If the person is an assignee of a membership interest, as provided in section 506.  1

(c) If the person is becoming a member of a surviving limited liability company as the result of a merger or conversion approved under this act, as provided in the plan of merger or plan of conversion.