answer: #Person1# wants Bill to take his feet off #Person1#'s desk, because #Person1# is going to sell it, and nobody wants a badly marked desk.
documents: #Person1#: Would you mind taking your feet off the desk, Bill?
  #Person2#: Sorry, but I was very comfortable.
  #Person1#: But do you put your feet on your own desk?
  #Person2#: No, never. I don't want to mark my desk.
  #Person1#: Well, would you please keep my desk clean?
  #Person2#: Aren't you going to sell it?
  #Person1#: Yes, but who wants a badly marked one?