You will do well if the community thinks well of you from the get go, as they will be more cooperative.

PGW has a Landlord Cooperation Program where a participating landlord can avoid a lien, but in the case of owner occupied properties (like some foreclosures), expect the lien. 

So kick their little butts out.And if they aren't cooperative with your offer to let the thousands of dollars of back rent go, if they just move,  then you evict them and get a judgment and hire a collection agency or go about garnishing their lives yourself.

If he can not cooperate, then tell you he needs to vacate so you can get the work done, or you will be doing the work and moving his stuff as needed, give him formal notice of when the work will start.

Would be great idea to build a cooperative relationship with the owner next door.

From what I can tell, she is already not cooperating and has an attitude problem.

I did not include the complete history of the matter but as I explain in the chain above I have reached out to the tenant to seek her cooperation in communicating with the neighbor about his allegations.

Our response is that we support that but we still cannot let them move out in the winter...during other months would would let them break their lease without charge so long as they are cooperative in assisting us in re-leasing the space (60 notice given, apartment is in showable condition, and they are flexible in when we can show it).  

She was having trouble with the city and the fire marshall, if I remember correctly, and she had absolutely no control over what was happening, and the church was not cooperative.  

Establishing and maintaining good landlord-tenant relationships takes more cooperation and mutual respect than what I see here.Typical charge $50/month?