(a) A landlord that has an on-site management or superintendent's office for a residential rental property must provide to a tenant a telephone number that will be answered 24 hours a day for the purpose of reporting emergencies related to a condition of the leased premises that materially affects the physical health or safety of an ordinary tenant.
(b) The landlord must post the phone number required by Subsection (a) prominently outside the management or superintendent's office.
(c) This section does not apply to or affect a local ordinance governing a landlord's obligation to provide a 24-hour emergency contact number to a tenant that is adopted before January 1, 2008, if the ordinance conforms with or is amended to conform with this section.
(d) A landlord to whom Subsection (a) does not apply must provide to a tenant a telephone number for the purpose of reporting emergencies described by that subsection.