Check your state landlord tenant laws. google it.Personally with prior history I would rather have them gone than accept the rent payment or do a settlement payment arrangement in court. 

it will actually be the Lockheed plant in White Settlement.

Here in San Francisco we post 3 day notices after the lease agreement grace period concludes, and if it doesn't cure we file an Unlawful Detainer and wait for MSC (Mandatory Settlement Conference).

It sounds like the current owner is offering a seller carry back, but that would make the buyer the owner at settlement, not 5 years down the road. 

I would make offers individually on all 6, look at the existing cash flow and the potential and the NOI on each.My offer would be subject to existing current mortgage, owner financing for the balance, a delayed settlement with right of management and possession.You would need to decide to keep or to assign - if you are going to assign - take the time within your delayed settlement to manage better - fill the vacancies and do some cosmetics.As for price to offer - DON'T  until you get her base price she thinks she wants - one problem is when we make offers before knowing their wish price - we will tend to offer more than she would have accepted.A delayed settlement is when you write a contract with a settlement 2-6 or more months - this gives you time to clean up the situations and market for an assignee.Make sure you get a number from her that will make you money on the assignment. 

You need to carefully look at the entire house and see if you can find any areas of excessive settlement in non foundation areas.

They've done an additional 4 prior titles/settlements for me in the past 4 years and I've had no issues with them.  

It took him over 9-mths to finally present us with anything and the settlement he finally presented and told us was a "good" settlement didn't even cover 1/2 the cost of the HOA contractor's bid to repair the damage to our home.

Settlements don't always lead to money.

Very simple, there are 2 settlements, but you own it to sell it, this way you aren't breaking any brokerage laws and what you charge is no longer an issue as to what your "service" is worth but more to the value of the property sold by an owner.