N.Y. Pub. Auth. Law § 2826
Notwithstanding any other provision of this chapter and notwithstanding any provision of any general, special or local law, whenever the whole number of the board of any authority or commission heretofore or hereafter continued or created by this chapter is three or more persons, a majority of the whole number of the members of such board, at a meeting duly held at a time fixed by law, or by any by-law duly adopted by such board, or at any duly adjourned meeting of such meeting or at any meeting duly held upon reasonable notice to all of the members of such board, shall constitute a quorum and not less than a majority of the whole number of such board may perform and exercise the powers authorized and provided in this chapter. For the purpose of this section the words "whole number" shall be construed to mean the total number which such board would have were there no vacancies and were none of the members of such board disqualified from acting.
N.Y. Pub. Auth. Law § 2826