We are doing a 3 percent cash rebate on the sale of an inherited home that needs a great deal of work. The buyer asked for it in his original offer and we countered with a higher sale price and an agreement to provide the rebate, which the buyer accepted. Not sure if it is typical or prevalent in this market, though. The only thing that appears prevalent in this market is seller desperation, which would certainly lead to concessions like cash rebates.
