My wife does a lot of work on urban agriculture. There is a lot of interest in projects like this right now. You could definitely get this built if you can hook up with the right people in the right location.
The second story area of that central structure is basically wasted space, isn’t it? Obviously you could make the whole thing a single story and save a lot of construction cost. Or one other thing that might work- tomatoes trained to a single vine can be trussed to something like a stainless cable, and will grow vertically 20+ feet. You would need some kind of open catwalk to harvest them at the top.