condominium project
(5) “condominium project” means real estate (A) which has five or more residential condominium units, in each residential structure, and the remaining portions of the real estate are designated for common ownership solely by the owners of those units, each owner having an undivided interest in the common elements, and (B) where such units are or have been offered for sale or sold, directly or indirectly, through the use of any means or instruments of transportation or communication of interstate commerce, or the mails;