They are on a corner lot and inside their hillbilly fence they have 2-3 dogs, a dog kennel, a shed, a chicken coop with chickens (I think 5, which is allowable in our city) and now a duck as well as a plastic greenhouse.They do keep their yard mowed, but this fenced in menagerie is an eyesore.Would I be out of line to contact the landlord and ask him to PLEASE put up a privacy fence, so we don't have to look at all the junk these people have crammed into their back yard? 

Go a day ahead of the exterminator with a giant box of thick 50 gallon contractor trash bags and make sure the tenants but everything in plastic boxes or double tied up trash bags (be careful when you get back home).

Aluminum wire has been the cause of fires, and may require special steps to reduce the risk.A local vendor producing plastic pipe years ago bought defective material that had been misrepresented.

What you can do in a single family zone is to add a companion unit /granny flat or ADU, and the State has now made it a lot easier to build an Accessory Dwelling Unit.

People are not careful and run too much grease down the drain and sewer clogs up, or baby drops a plastic lid in toilet that plugs sewer, $1200 later the plumber fishes it out after sewage backed up and ruined $1000 of carpet.

I was l looking into bandit signs and saw a few videos on how to go to Home Depot to buy corrogated plastic sheet and to cut them to make the signs.

Yes, he had LIVE exposed wires twisted together with no plastic cap hanging in his shower for years.   

And DO NOT let them put in an above ground pool either (unless it's one of the $20 plastic ones from Walmart). 

You said "blue boxes" so it's plastic junction boxes and they are typically installed say 1/2" proud of the stud face, the rotozip would need to hit the OUTSIDE of the blue box and go all the way around. 

I may also cover aa large area with black plastic in the spring after I dose it with high nitrogen fertilizer , this will burn the root system .