W/out examinating the contract, I would think you could place the house back on the market. BUT would this be wise? If you were to put the house back up today, get a full price offer tomorrow, you would still be waiting 3 to 4 weeks for this new buyer to get financing. Most buyer's are having a hard time getting financing due to the banks are getting skittish (they are really tightening the screws on qualifying). You may want to counter back to the buyer and give them the 2 weeks, but add the phrase "time is of the essence". With that phrase, the times in the contract become the drop dead dates. If buyers cannot get financing by then, it's everyone out of the pool.