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. 

I would say that all theses answers are really good but the biggest thing is persistence.

I was honestly kind of shocked he persistently called me as if there was anything I could do about it immediately.

Keep in mind though that it is illegal in most locations to relocate a wild animal to avoid the spread of disease so I usually just shoot them in the trap.