@Jodi Gauthier
First, make sure an auction isn't already scheduled for this property. Check the property records for all liens, judgments and notice of trustee sale/mortgage foreclosure. If you don't know how to do this yourself, then pay a title company $100 for a title report. You need to know how close the bank is to taking back the property. If they haven't initiated the foreclosure process yet, you have more options. If they are close, some of the following steps will have to be rearranged or eliminated.
Second, try to find the previous homeowner. Facebook is good for this; I've had pretty good luck either contacting the person directly or through their friends on Facebook. I was able to get in contact with someone who was holed up in a condo unit and trying not to be found using this method. If you get creative, you'll find the previous owner. If you find them, offer them $500 for a signed and notarized authorization to discuss their loan with the bank, and tell them you may try to buy their note and write off their debt, thus helping them out.
Third, check bankruptcy records (pacer.gov) for the homeowner and see if he has been through bankruptcy. Sometimes, the bank has participated in the bankruptcy and obtained a release from stay from the court so they can foreclose. This will give you a contact (usually a law firm), that might be able to direct you to the department of the bank handling the debt for this property. This can be useful with major national lenders like Bank of America, which have many different offices that could potentially be dealing with this loan.
Fourth, contact the bank and attempt to purchase the note. It's possible they have already written down/off this loan, and are willing to sell it for a discount, especially if it's in a non-prime market in Texas. It will take persistence to find someone who has the authority to deal with you at the bank, but eventually you will get there if you keep trying. Document/log all interactions you have with bank employees and take notes of what was discussed, with whom it was discussed, and the date/time it was discussed.
Fifth, if at this point the bank has blown you off and is trying to foreclose, you can file an action in court to stop the foreclosure. It doesn't look like there is a statutory process for this in Texas, but you can just ask for a preliminary injunction. In most states, the lender has to give you a payoff for the loan if you are the record owner of the property, and even if this isn't by statute, you can make an equitable argument to the court that you should win. After all, you are the record owner trying to pay off the bank (although at this point, if you haven't been successful in negotiating the sale of the note at a discount, you will probably end up having to pay off the loan in full). Use all the evidence of your attempt to pay off the bank as ammo for why the sale should be enjoined and the bank needs to give you a payoff. The court isn't going to allow the bank to wipe out your equity if you are making an attempt to satisfy the debt.
Renting out the property isn't a bad idea to get back some of your money, but make sure you only do a month to month lease, since the renter may be able to sue you for damages if the bank forecloses and successfully invalidates the lease.