If the city council allows it then yes you can.
I think it's grey-ish. When the question of the video signage came up, and the 3rd party advertising on it, RG said they "had a business relationship" with all the advertisers on it. But that was when they only had a couple dozen. Now anyone can advertise on it, and the only business relationship you have with RG is you pay them a fee to be on it. Nothing has changed in the bylaws though.