How can I protect myself when buying a leaseback house?

[Charles Jessup]

I'm planning to buy a house, and the current owners want to lease it back for a month before moving out.  I'm ok with this, but want to protect myself in case there is new damage.  What I'm worried about is that now once they've sold it, they might not take such good of the house anymore.  What can I do to protect myself?  Do I need to do anything?