New York Post: Real-estate mogul Steve Witkoff has been locked in negotiations with the Daily News’ two biggest unions over his plans to buy the tabloid from owner Mort Zuckerman. A deal is far from done, however. Witkoff did not submit a formal bid by the late May deadline and has yet to put an offer on the table. He got a period of time to see what kind of concessions he could wrangle from the drivers and pressmen as part of due diligence, sources said.