N.Y. Public Authorities Law § 1120-H
4. Any resolution or resolutions authorizing bonds or any issue of bonds may contain provisions which may be a part of the contract with the holders of the bonds thereby authorized as to:
9. The authority, subject to such agreements with bondholders as then may exist, shall have power out of any moneys available therefor to purchase bonds of the authority, which shall thereupon be cancelled, at a price not exceeding: