Holy Dooly!
I’m with Jimmy on this one. This guy sounds deplorable!!
Besides the temporary relief Jimmy has suggested, it might also be worth putting a call into the anti-discrimination commissioner to find out your rights in relation to discrimination law.
You’re best bet is certainly to stay cool and not engage with him. Keep the tenants in the other building on side – surely they see his irrationality.
If he’s threatened you physically or psychologically then definitely register a complaint with the police. Then if/when he rings them to complain about you he’s flagged as a nuisance.
If a new strata manager is appointed they may be able to explain the situation to the other owners and over ride the previous damage.
Good luck… hope you smash the ba$&@rd