Seller postponed closing last minute. What concessions can I get?

[Brian Barfoot]

Hi all,

      I have a house that already had a delay in closing because the seller needed time to move out. Now this morning I get an e-mail saying that with 44 hours to go they don't have their paperwork together and can't close on the intended date. I had a contractor set up for that afternoon and a prospective tenant scheduled for the next day. Now I've had to put the contractor on hold and the tenant says that he can't wait and is going to take a different apartment. Does anyone have experience with this? What concessions should I try for since the lack of competence on the seller's end has cost me time and money?