Talks between the Cubs and rooftop owners are at an impasse amid the first legal shot, continued disagreement over outfield advertising signs and convention weekend rhetoric.

As a result, the much-hyped $300 million Wrigley Field renovation — and the revenue it would bring to improve the team — remains in limbo, with Cubs ownership still trying to persuade the surrounding rooftop clubs to drop threats of a lawsuit before it begins construction.

Differences over the size and placement of a video scoreboard the Cubs would like install in left field brought the negotiations to a standstill Tuesday, said Ald. Patrick O'Connor, 40th, who has been meeting with both sides since late last year to help reach an agreement at the behest of Mayor Rahm Emanuel.

Against that backdrop, rooftop owners sent a message by filing a lawsuit that doesn't involve signs that could block their views.

The rooftop owners sued Marc Ganis, a Chicago sports business consultant, for making allegedly false statements about them in an article published in the Chicago Sun-Times in January 2013. In the story, Ganis is quoted as saying the rooftop clubs were “stealing” the Cubs product for their own profit.

In the suit, rooftop owners said those statements were false and harmed their reputations because they have a contractual arrangement with the team that allows them to sell tickets to people who want bird's-eye views of the games. Ganis did not return several messages seeking comment.

While the team was not named as a defendant, the rooftop owners alleged that when Ganis spoke to the Sun-Times, he was either employed or associated with the Cubs through some other arrangement. Tribune Co., owner of this newspaper, retains a 5 percent stake in the Cubs, and two Tribune Co. affiliates were listed in the lawsuit among others the plaintiffs would seek to question.