of the House of Representatives . (C) Material neutrality The plan submitted by the Secretaries shall be, to the maximum extent practicable, material neutral, and may include using mass timber, carbon concrete, and any other materials. (b) Minimum purchases (1) In general Not later than September 30, 2027, subject to the exceptions listed in paragraph (2), the Secretaries shall procure facilities, buildings, or structures, including not fewer than 100 single-occupancy restrooms, using domestic mass timber. (2) Exceptions The Secretaries may decide not to procure facilities, buildings, or structures using domestic mass timber if the Secretaries determine that the items— (A) are not reasonably available within a reasonable period of time