Having a meeting with someone is great, but doesn't mean a thing. ADAs, AUSAs, and AGs are wrong all the time. Discrimination has nothing to do with this issue and why you keep going back to that, I do not know. As long as the facility treats all residents the same, there is no discrimination claim.
As for your other link, the while I don't have time to read all 50 pages, the closest thing I could find was that a resident can use whatever registered health care provider they want (7.9.2.22(N)), or "reasonable" access by various other people (7.9.2.22(B)). Neither says they override the landowner's common law right to control access to their property.
If you still need "proof" that that right actually exists, try a Property Hornbook (available online or at any law school bookstore), or, given my limited access to the internet from my ipad, see Kaiser Aetna v. US which is admittedly not on point but does contain "proof" (from the SCOTUS) that common law property rights exist, which for some odd reason, seems to be a disputed issue here.
So, you know, bricks, glass houses, all that.