(a) A person who refuses to surrender possession of real property on demand commits a forcible detainer if the person:
(1) is a tenant or a subtenant wilfully and without force holding over after the termination of the tenant's right of possession;
(2) is a tenant at will or by sufferance, including an occupant at the time of foreclosure of a lien superior to the tenant's lease; or
(3) is a tenant of a person who acquired possession by forcible entry.
(b) The demand for possession must be made in writing by a person entitled to possession of the property and must comply with the requirements for notice to vacate under Section 24.005.
Official text of the Texas Property Code as published by the Texas Legislative Council.