Lastly, joining the Academy is basically risk free. 

~Lastly make sure to get everything in writing from the previous owner, that way you don't have to worry about them interfering.

It's a long game. 

However, I don't actually care as long as they are not bringing in clients, displaying signage, storing materials, etc.

We would like to rent out the whole house in the future, but as a long term rental and not fully furnished, once we have fixed the things that need it.  

Think long and hard. is 500- 1k in savings really worth the aggravation and again, potential loss. 

Right a nice letter, send it by email and registered mail, telling them you have purchased the building and will be terminating their lease on the last day of July so that you can move into the unit.

Last, how do you find the ARV?

For example, you could tell them that they don't appear happy with the rental and offer them a one-time early termination without penalty, as long as they leave within the next 30 days.

Client Relationship Management: How can agents build and maintain strong, long-term relationships with investor clients?