New York Consolidated Laws, Not-For-Profit Corporation Law - NPC § 509. Purchase, sale, mortgage and lease of real property

(a) No corporation shall purchase real property unless such purchase is authorized by the vote of a majority of directors of the board or of a majority of a committee authorized by the board, provided that if such property would, upon purchase thereof, constitute all, or substantially all, of the assets of the corporation, then the vote of two-thirds of the entire board shall be required, or, if there are twenty-one or more directors, the vote of a majority of the entire board shall be sufficient.

(b) No corporation shall sell, mortgage, lease, exchange or otherwise dispose of its real property unless authorized by the vote of a majority of directors of the board or of a majority of a committee authorized by the board;  provided that if such property constitutes all, or substantially all, of the assets of the corporation, then the vote of two-thirds of the entire board shall be required, or, if there are twenty-one or more directors, the vote of a majority of the entire board shall be sufficient.

(c) If a corporation authorizes a committee to act pursuant to paragraphs (a) and (b) of this section, the committee shall promptly report any actions taken to the board, and in no event after the next regularly scheduled meeting of the board.