For example the one that I live in I put in no pets, no smoking, no sublet, no waterbeds, no inflammatory speech displayed in window,  can't use the roof, decorations must not destroy walls. 

Only a guy on meth would have such a laser focus on anti-wholesaling!

We had another guy (I'm guessing his diagnosis was anti-social personality disorder with the jealous subtype).

Area/location risk - an area or location might decline over time due to loss of a big provider of jobs or change of city government from pro-landlords/pro-business to anti landlords/anti-business.

Looking into rental in states that are not 100% anti-landlord.

Not nearly 50% rule but the house is in a high demand coastal city of Santa Cruz CA with limited new construction boxed in by silicon valley and the ocean, not to mention the city planning's anti-building codes.  

It’s only been 2 months.I can’t figure out what is motivating the guy to behave in this manner.He’s started avoiding me (which is fine, because I’m anti-confrontational and I'm quite angry right now), but I think we probably need to sit down and have a chat to get this to stop.The property code inspector actually recommended that I seek out a mediator to help deal with the guy because he's been repeatedly calling him about the violations.Would you cut bait and run?

If you can make a legal argument for why you are denying someone with a companion animal, showing you didn't intend to blatantly just discriminate against them because they had one, then I really don't see any huge thing to worry about.I know this because I had a legitimate discrimination case in California, which probably has the most stringent anti-discrimination housing laws in the country - and it was a joke.  

-linoleum = naturally anti-bacterial(no it is not a sheet of vinyl): @Roy N. can you help me with that?

May I also suggest, depending on where the mold is building up, to replace product with anti mold product.