The first thing that comes to mind for me is that cities are usually pretty far from the farms. This leaves farmers and those wishing to buy from them with long supply chains. In my experience, people that live in cities have never really had fresh vegetables before unless they've personally grown them.

With this in mind, I can see a large former factory building being converted into vertical farming and then selling fresh produce, year round, to select clients at a premium.

Being able to farm and produce year round is also quite a nice bonus. You can largely ignore the weather, except where it impacts your supply chain.

All that said I think it's a fine idea and a great use for previously used industrial spaces.