Curtis Stone is making $80,000 on half an acre (50 min. video) in the core of urban housing from various rented parcels. Curtis Stone is focused on quick growing, high value crops like micro-greens, lettuce, kale, cabbage… And only works part-time.
If you can make way, for 200 indoor sq. ft., and about 7 hours a week (1hr./day) you can make over $30,000/year growing oyster mushrooms (full article), which have great market notoriety and niche markets with restaurants