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[eds]

First, the cost of the real estate per square foot is irrelevant,
. . . because the plants are stacked in trays 8 high, and
. . . they are set in a repurposed old building in cheap industrial real estate.

2nd, LED lighting has evolved to where they can tune the lighting to,
. . . the exact colors that the plants need for photosynthesis,
. . . saving huge amounts of electricity, and
. . . excess heat over the broad fluorescents and metal halide lights of a decade ago.

3rd, Air, is rich in CO2, and
. . . nutrients are fed at just the right rate using,
. . . 70% less water, and
. . . it is all carefully monitored by computers and technicians.

1-9-2017 Source:  Aerofarms: vertical farm, really works