In this subchapter:
(1) "Lender" means a person holding a mortgage, lien, deed of trust, or other security interest in property.
(2) "Residential real property" means:
(A) a single-family house;
(B) a duplex, triplex, or quadraplex; or
(C) a unit in a multi-unit residential structure in which title to an individual unit is transferred to the owner of the unit under a condominium or cooperative system.