Ideally you would sell it to someone with a subprime loan they can walk away from. They never make any payments, the bank repos the house. Somehow the hazmat is

Ideally you would sell it to someone with a subprime loan they can walk away from. They never make any payments, the bank repos the house. Somehow the hazmat is discovered and the bank is compelled to fix it in order to sell the house, or at an even steeper discount because of remedied hazmat. Win win!