Neighbor is parking trailer in the field, claiming it belongs to city,and doesn't need to move it to their property,which is city property.
I am not sure what your question is or why you care what your neighbor does with their trailer. If you are concerned about this and want to know the city or county rules, call the city or county. Your call to the city or county will both help you learn what the various rules are and at the same time you can report the trailer. Most cities have rules about leaving vehicles parked that aren't being moved regularly and will eventually cite and tow the vehicles as abandoned property. Unless this is really important to you, I would just let your neighbor and the city deal with it.
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Since in Oregon many cities have operational control of a portion of the county land immediately surrounding the city borders for a distance, my suggestion is that you start with the city planning department. Tell they what you want to know. If what is going at your neighbors on runs counter to the zoning and other laws allow, then ask the city to investigate. If the city won't proceed, ask the county.
If neither will do anything, perhaps then speak to an attorney.
Please keep in mind that this is not intended to create an attorney/client relationship. These are only general comments made without all the critical facts needed to fully form an opinion.
I presume that you are unhappy with the trailer in the field. I agree that the first call would be to the City to determine if it's their property and if so, can they have it moved to the owner's property as it is an eyesore. If they tell you it is not their property, ask who's property it is.
You can sometimes find out who owns a property by callling a title insurance company too.
However, if it the city or the county that owns the land, you will still need to have one or the other deal with it. I don't think that hiring a private lawyer to do something about it will help as I don't see how you have standing to bring a claim to move something off property that is not yours. Good luck
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