Lastly, there's $4k in outstanding taxes that my Aunt didn't pay that are past due as well.What shall I/we do?

If you do an outstanding job, one attorney giving your name to another attorney is worth 1 million if you think about it. 

.- We are thinking of using HELOC on some of them.Again, there are many things we are looking to do with the funds, but we need someone ( a smart lender) who can provide us with a tailored plan that can benefit each other, specifically having outstanding rates.Tell us if this all makes sense.

The equity in your home is the current appraised value minus the outstanding principal on your mortgage.

It looks like you have about 80K outstanding (assuming you haven't paid the loan down).

In many cities, the water bill is tied to the property, so there could have been pre-existing outstanding bill prior to the tenant moving in.

Also if you know anybody with MLS access see if there are any outstanding mortgages on the house.  

If you want to pay off the loan, the outstanding escrow balance will be applied to the loan balance.  

I always assume there is an outstanding HOA debt with a mtg foreclosure. 

Looks like also with this kind of sale the real estate could be connected with outstanding debt owed by deceased owner.