In some US states, particularly those where only judicial foreclosure is available, the constitutional issue of due process has affected the ability of some lenders to foreclose. In Ohio, the US federal district court for the Northern District of Ohio has dismissed numerous foreclosure actions by lenders because of the inability of the alleged lender to prove that they are the real party in interest. The same happened in a Colorado district court case in June 2008.
Just remember, you will need to get the seller to agree on not only the rent to own agreement, but the terms of the agreement. i. e., length of the agreement, usually, one to two years; the percentage of the rent which gets applied to the sales price or closing costs, etc. If you get lucky, the seller may also be interested in doing Seller Financing with you. Just be sure to have a lawyer review any agreement before you sign it. A little legal cost upfront could save you thousands of dollars down the road.