How do I get rid of a vacant mobile home on my property in AZ?

[Miles Woodward]

Okay, so I have a mobile home park that I bought recently in Arizona. 

3 of the homes are condemned by the city, and for good reason. 

I am trying to get rid of them. For one of them it is an old war vet homeless man who has paid me twice in 6 months to keep him trailer on the premises. 

My manager presented him the five day notice and now he is threatening to sue. 

Please, how do I go about getting this condemned trailer off my property? Help!