"(3) “Premises” means a building or a portion of a building. The term does not include any public or private driveway, street, sidewalk or walkway, parking lot, parking garage, or other parking area."
A building OR A PORTION OF A BUILDING. Why add the second part if it was always meant to be the entire building that the prohibited place resided in?
I know that courts don't always read English the way most of us do...but it really seems pretty plain to me (and Dan Patrick too).