Need Attorney with "Subject To Deals" Experience

[Nathan Johnson]

I purchased a house as Subject to from an investor.  He gave me the Power of Attorney from seller, filed general warranty deed and many other documents.  I have been updating the house and making the mortgage payments in the seller's name (kept his mortgage).  Concerned he may want to come back so how do I ensure the asset remains mine.  I'd like an attorney to review all the docs I have to ensure everything that needed to be filed with the county has been done.