N.Y. Gen. Mun. Law § 516

§ 516. Intervention by commissioner. In any action or proceeding\naffecting any urban renewal program, the commissioner shall be given\nprompt notice thereof, and he shall take such steps in such action or\nproceeding as may be necessary or desirable to protect the public\ninterest. If, in the opinion of the commissioner, it is necessary or\ndesirable in the public interest that he intervene in any such action or\nproceeding he shall be permitted to do so as a matter of right. Whenever\nin connection with an urban renewal program, under any instrument or\nlaw, a notice in writing is required to be served upon the municipality\nbefore the institution of any action or proceeding, a copy of such\nnotice shall be served upon the commissioner at least five days before\ncommencement of the action or proceeding.\n