(a) The provisions of this Agreement may be amended by the affirmative vote or written consent of: (i) in the case of matters relating solely to A Exchanges, the Issuer and each of the Blackstone Holdings Partnerships and, after a Change of Control (as such term as defined in the Blackstone Holdings Partnership Agreements), the holders of at least a majority of the Vested Percentage Interests (as such term as defined in the Blackstone Holdings Partnership Agreements) of the holders of Blackstone Holdings Partnership Units (excluding Blackstone Holdings Partnership Units held by the Issuer and the Blackstone Holdings General Partners), and (ii) for all other matters, each of the Blackstone Holdings Partnerships and, after a Change of Control (as such term as defined in the Blackstone Holdings Partnership Agreements), the holders of at least a majority of the Vested Percentage Interests (as such term as defined in the Blackstone Holdings Partnership Agreements) of the Blackstone Holdings Partnership Units (excluding Blackstone Holdings Partnership Units held by the Issuer and the Blackstone Holdings General Partners).