Best and final bids were originally due at the end of May and now bidders might get an additional two weeks, according to the sources. Kohl's sizable real estate holdings, which analysts have said could be worth between $4 billion and $6 billion, make an acquisition financeable, the sources said. Two weeks ago, Kohl's fended off a board challenge from hedge fund Macellum Advisors, which has been pushing the company to sell itself, arguing management has not done enough to boost sales and improve the business.