Here's a Fortune article on an outfit in NJ.
Here's a Technology Review piece on farming in shipping containers.
It's possible that the advent of LED lights makes such farming economically feasible, feasible at least if the produce gets a premium from being "local" and "organic". USDA has agreed that they may be labeled "organic", though the original organic community does not like the idea at all.
Call me old, I am, but I don't call these "farms" or "farming".