This subtitle applies to: Affected property; and Notwithstanding subsection (b) of this section, any residential rental property, the owner of which elects to comply with this subtitle. This subtitle does not apply to: Property not expressly covered in subsection (a) of this section; Affected property owned or operated by a unit of federal, State, or local government, or any public, quasi-public, or municipal corporation, if the affected property is subject to lead standards that are equal to, or more stringent than, the risk reduction standard established under § 6-815 of this subtitle; or Affected property which is certified to be lead-free pursuant to § 6-804 of this subtitle.