The rich want to pay for it, but why should they?

In this Miami New Times article, it is claimed by Neisen Kasden of the Downtown Development Authority that the filthy rich tenants of Brickell ave are "willing to tax themselves to pay for part of the improvements." Notice that there is no exploration of how much of these improvements they would be willing to pay, but given the project is estimated at only a measly $5-10 million, maybe they should just pay for the whole thing? They can call it giving back to the community, right?
One comment on the article by Esperanza Suarez Kelly notes, "My friends at Curtis + Rogers have been working on this for a very long time."

And so there is part of the story. You've got a design group whose been working on a project for some period of time despite their not being any money reserved for the project to begin with.
Who wants this project done?

I'm certainly very concerned with safety issues in the area, particularly Brickell which is notoriously anti-pedestrian, despite being one of the densest areas in Miami. However I am always skeptical of any plans that begin to hatch before they are laid.