Our rental criteria states "No outstanding debt in excess of $1000 that is not in a payment plan."

I am interested in offering to buy for the outstanding taxes, but have no idea on how to.

You're talking about the lenders policy.The lender doesn't want to hear down the line that there was an outstanding lien that wasn't paid and they are really in second position, so, they want insurance against such an event.

@Luis Capriles Benjamin Graham's "The Intelligent Investor" is an outstanding foundational book about stock market investing, with an emphasis on value investing.

You have found an outstanding lender!

Also if you have a Fleet Farm by you they are closing out their tile and carpet sections. 

Hey David, I have a CPA I use who does an outstanding job and knows real estate pretty well.  

I keep track of checks and dates received.I use a SUM function to see how much is owed, how much outstanding and total interest rate.I can color code redeemed properties a different color.It is super easy to customize. and once you set it up it automates everything but entering the data once you get a redemption check or a deed.You can copy over the tab to a new one and start a new year with all your formulas intact.

That's an outstanding rate!!

The six month standard also went away many months ago for Fannie.Now, if you own 4 or fewer financed properties, the reserve requirement is 2% of the outstanding balances of your investment properties.