I have never seen a counter trespassed because you're not doing anything illegal, just asked to leave. Causing trouble is different, you can b trespassed and read the trespass.
As far as changing ownership, the casino uses the same files, even though its new ownership. I guess legally this could be challenged, not sure. I can only go from what I have seen and that is the databases are kept the same, everything applies.
But we had a count team that would come into the place were I worked numerous times and even use different names, they were never trespassed formally just asked to leave. Maybe the casino doesn't want to get into the legal side of trespassing someone who is not doing anything illegal, Gaming would be brought in and do nothing. Hell I have seen Gaming release bet cappers, etc because they are too lazy to do the paperwork. It all depends on your attitude toward gaming, if you're nice and cooperate it goes much easier, if your an ass they will bust for a $5 bet cap.
If the casino is torn down and a new one built, the records are all gone. That's a different story.