Emeraldstar,
The access law would only apply if the person was indeed the landlord (or an agent). If there is confusion as to who owns the building, I would not even go there. One must get a clarification as to who is the LL.
I sound like a broken record, but a good tenant attorney can make both sides cut the bullshit.
If a property has been sold, then there's a deed. If it's been foreclosed, there are bank and court records.