23.This chapter applies to contracts between a person or partnership and a broker or agency under which the broker or agency undertakes to act as an intermediary for the purchase, sale, lease or exchange of
(1) part or all of a chiefly residential immovable comprising less than five dwellings; or
(2) a fraction of a chiefly residential immovable that is subject to an agreement or declaration under articles 1009 to 1109 of the Civil Code.