Tough it out and be persistent. 

If you're persistent enough you'll find the right people.

@Andy welcome to BP you are going down the correct path my friend what I would suggest is that you go to at least 1 meetup a week and befriend an investor you can find the real deal makers in the back with grey hair start up a simple conversation and explain to them your goals and what you want to do help make them more successful and in turn you unlock the door to FREE Knowledge just keep at and be persistent man you will someone because older investors always like helping younger ones.

I was mostly hoping that the police would get in contact with the owner and hopefully have them evicted, which is why I was so persistent.

It will cost you the filing fee, but if you are persistent, somewhere down the line they may need to square it away.

Nice to hear persistence is the key.

He may find another way to be a nuisance, but at least that one will be closed off.If it persists and you have police reports, you may be able to use them and your existing lease to evict if your lease has terms about quiet enjoyment or criminal activity.

Unless you are very lucky and very persistent, Portland will not meet your needs.  

What I have seen work is being persistent and consistent.

Whatever you do, be persistent.