Just doing a little research on the Urban Farm idea and came across Sweetwater Growers, Inc. They hydroponically produce basil and microgreens, which they then sell to Whole Foods. It sounds as though they can't grow it quick enough, with Whole Foods taking it all off their hands as soon as it harvested. I may have to discuss with this guy and see how viable it has been for him cost wise.
Also, it looks like off the bat, it is going to be a minimum $50k to get the set up for the farm. That is not counting the cost of a location, which could be subsidized if we did it in the right place of the city.
Will keep you all posted as to what I find out.