The seller only can sell the house once, so how can the seller accept more than one offer? A seller can accept more than offer but they have to be in line. In other words, if first in line does not perform, 2nd in line gets an opportunity to buy the property. If 2nd does not perform, it goes to 3rd. Except for first in line, the offers are back-up offers and the obligation of the seller to sell the house to one of these buyers is contingent on the failure of the preceding buyer(s) to perform. If the first buyer performs the others are out of luck. This is a short version and there is more detail than I have provided here.