Noticed it was abandoned, researched courthouse records, determined it was adjudicated to the Parish for non-payment of taxes, submitted purchase request to the Police Jury for amount of back taxes, made required notifications by mail and newspaper, waiting mandatory days for owner to redeem, and when redemption period expired, closing occurred at Police Jury Office.

FYI - you can check the HUD website for payment amounts based on rental size for different zipcodes.

The $900 cash flow should cover that payment. 

And what percentage of down payment are you looking to put down?

Is there an escalation clause where your payments go up every month?

What type of payment was it (ACH, credit card, etc.)?

Great sourcing methods!

I have 50k for a down payment and another 25k to cover any extra costs that may come along with it, but I don’t know where to start looking.

Focus on cash flow: Make sure the rental income from your properties covers all your expenses, including mortgage payments.

I am thinking that they wouldn't have to pay cap gains tax on the "sale" because they'd be earning interest income on the loan payments.