Hi guys.
Im dealing with this older lady (I assume in her 60´s) for 3 years and I had a lightbulb moment a few months ago that she may be BPD/ NPD.
She is the president of a building where I have an apartment (I rent it, I have never lived there). For some reason she began harassing me. First with phone calls cause according to her my tenant was not following the rules. I tried to help her, but its obvious I cant control him. She began threatening me with fines. After some months of this I told her that either she sends the fines or stops threatening, cause sending a fine 6 months after the event will make no good. She never did cause he wasnt breaking the rules.
This went on and on over the 3 years, with different issues. To the point that she began sending me letters with warnings of all types, for example shes trying to prevent my real state agent to enter the premisses (which is against the law in my country). I have received four letters in three months (my apt is now vacant for 5 months and I pay all the fees religiously).
So I decided to answer in writing (taking advice from a lawyer) that all the "warnings" she gave me have NO backing up with the rules or the law WHATSOEVER, thats harassment and if I receive one more of those Im suing her. Because she herself broke the building and city rules and laws and many others did but Im the only one being bullied. So it stopped. I demanded equal treatment or she will have to face the consequences.
But she scheduled a meeting for saturday and Im guessing Ill be the target of all the building´s problems (pretty much like the last one 1 year ago). So Im trying to prepare myself. Whats the best way to deal with her? Im sure she will try to shame me in front of others. Im also sure that even being right, they will side with her (they live there, I dont, they prefer to keep peace with her and let me be her target).
Seems to me she wants control at all costs. And she saw something in me that makes her go crazy. Maybe some weakness on me. She dared to yell at me and say curse words. Also, she called me a trouble-maker in a letter.

I kindly explained to her in private that she cant just call me names in writing like she did, she will cause herself legal problems, its defamation. Maybe being kind wasnt working. The only thing that seemed to work was the my "stop it or Ill sue you" letter.
Sorry for the long post, there are lots of details I could give but I dont want this to turn into a soap opera. I believe she´s a control freak, she rages and yells, seems BPD to me. She believes she´s a figure of authority and Im supposed to acept and obbey to all her demands.
Any advice or similar experience? Thank you so much!