It has four 2 bedroom 1 bath units and each unit collects $525 per month on rent.

This may be a question for the towing company, but someone might know - does she get charged immediately when the truck is called or pulls up, or must the vehicle be physically towed.Do have to make an addendum to the lease and have her sign in it in order to collect the towing fee?  

I recommend the whole Rich Dad Poor Dad collection, including the affiliated books by Ken McElroy, Carlton sheets, and a few others.

There are plenty of listing brokers out there but would prefer to deal with a buyer's broker who has extensive experience dealing with investors and who is well dialed in to the local market and can be a potential source of new deals.

What is the realistic way of collecting unpaid rent, even partially ?

We went through multiple extensions and I thought for sure the seller would back out.  

The property needs an extensive renovation.  

It required an extensive reno which exposed me to hours under the sink and supervision of multiple subs and tradesmen.

@Deryk Kennedy like @Erik Hitzelberger says you must be licensed to manage rental property and collect a fee as compensation (in Kentucky), however that being said...you do not have to be licensed to work for a property manager as a W-2 employee.

Jones wants to sell me the property or basically the right to collect the balance of Ms.