That's a Denver ordinance. I suggest you plead not guilty (if you haven't already paid it) because that's not what you did.
You did not make a left turn within an intersection.
You did not make a left turn into an alley, private road or driveway.
A technicality, yes, and you are still at fault for the accident, but it's a possible way of beating the ticket.
Well damn, it's too late because I paid the ticket: I was under the impression I wasn't going to be able to beat it and didn't want to waste time. There's definitely lessons that have been learned here for moving forward. I appreciate your guys' feedback.