I have been working toward that for some time and I am 80K from that point (80K balance on rec property) My investments are all cash flowed very well so I do not include that as my debt even though officially I guess it is.I have the ability to pay off all my investment properties 100% in the next 1.5 years.

As Aly suggested, sending one to the last known address (your unit) by certified mail is a good idea (to CYA).Btw, I've had this situation occur and my practice is to show the evicted tenant a full accounting that exceeds their deposit and offer to forgive the balance owed.

Draw balance between research and action.

However the HELOC loan would allow you to continue to earn on your 401K balance, which can be a big factor in the long run. 

We have 1 car payment/debt with a pay off balance of 23k.

I returned via FedEx along with a cashiers check for the remaining balance. 

I try to maintain a balance, and very much try show I appreciate them for what they do for me financially.

Spend some time getting your personal balance sheet ready to invest.

The amount of interest is the annual rate divided by 12 (i.e, the monthly interest rate) times the outstanding balance.

If you don't plan on doing any more deals together then by all means deposit the check from closing and cut checks to yourselves for the balance when you close the accounts.