New York Consolidated Laws, Limited Liability Company Law - LLC § 1211. Transfer of a membership interest

(a) No member of a professional service limited liability company may sell or assign his, her or its membership interest in such limited liability company except to another professional eligible to become a member of such limited liability company or except in trust to another professional who would be eligible to become a member if such professional were employed by such limited liability company.

(b) Nothing contained in subdivision (a) of this section shall be construed to prohibit the assignment of a membership interest by operation of law or by court decree.  An assignee of a membership interest by operation of law or court decree shall have the rights of an assignee of a membership interest set forth in section six hundred three of this chapter.  Such assignee shall automatically become a member of the professional service limited liability company if such assignee would be eligible to be a member of such limited liability company and, a majority in interest of the members shall fail to redeem the membership interest so transferred, pursuant to section twelve hundred ten of this article, within sixty days of receiving written notice of such transfer.

(c) Any sale or transfer, except by operation of law or court decree or except for a professional service limited liability company having only one member, may be made only after the same shall have been approved by the vote or written consent of such proportion, not less than a majority in interest of the members, exclusive of the interest of the member proposing to sell or transfer such membership interest, as may be provided in the operating agreement of such professional service limited liability company.  The voting interest held by the member proposing to sell or transfer his, her or its membership interest may not be voted or counted for any purpose, unless all the members consent that such interests be voted or counted.  The professional service limited liability company may provide, in lieu of or in addition to the foregoing provisions, for the alienation of membership interests and may require the redemption or purchase of such membership interests by such limited liability company at prices and in a manner specifically set forth therein.  The existence of the restrictions on the sale or transfer of a membership interest, as contained in this article and, if applicable, in the operating agreement, shall be noted conspicuously on the face or back of every certificate representing a membership interest issued by a professional service limited liability company.  Any sale or transfer in violation of such restrictions shall be void.