By Benjamin Horney (December 9, 2014, 6:14 PM EST) -- Outdoor advertising company JCDecaux SA is considering a bid to buy the European advertising assets of U.S. peer Clear Channel Outdoor Holdings Inc., Reuters reported Tuesday. According to the report, the assets involved in the deal could be worth more than $2.5 billion. If the two sides agree on a deal, there could be regulatory issues, the report said, as regulators may have antitrust concerns. In anticipation of those potential issues, JCDecaux is already considering pairing up with a private equity firm to make its offer, although the company, which is known for bus stop advertising systems, billboards and public bicycle rental systems, could still wind up making a bid by its lonesome....