I also did reach out to him via text several times and spoke to Ed and he was unwilling to remedy the situation.  

The thought of carrying around 3 different sets of business cards sounds extremely inconvenient but I don't want to miss out on opportunities because I was unwilling to do the inconvenient.I also thought all 3 fields were closely related so perhaps I would be able to tie them all into one business card, but the last thing I would want is a client to think they will not get my full attention because I have two other ventures going on. 

Key issues; calling the note due, foreclosing on the property, requirement of a quiet title lawsuit, bank unwilling to finance the purchase. 

You could earn extra dollars doing anything really and then save it for your first flip if you unwilling to create a debt.

@Corey Johnson Is the owner unwilling to give you Owner Financing with a balloon?

Technology is critical and if he is unable or unwilling to make the transition into the 21st century he is playing at a massive handicap.  

Consider this; if they are unwilling to pay the last month's rent given sufficient notice, are they going to also refuse to pay for any damages caused to the property that the SD is meant to cover.  

If it lands in court, tell the judge you tried to send it back a year ago and tried to settle up now and tell the judge they are wasting the courts time.Hire a lawyer if you want, but for the small amount, I am not sure why they would take you to court unless you are unwilling to return the full amount.

Sort out if you are better or worse off if they are unwilling to pay a rent increase and leave.  

This seems to me so clearly normal wear and tear that I'm quite angry, and is she is unwilling to reconsider.