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The profit margin for a grain farmer in the US is about $100/acre in a good year. There are 43,560 square feet per acre. The ballpark estimate for construction of 10-20 story office space is $125-150 per square foot.

To break even, you'll have to build something that requires zero maintenance that also lasts about 60,000 years and of course you'll need zero point zero interest rates over those sixty millenia just to break even.

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And of course you need to worry about pest management when growing that much of anything in such density. What sort of mechanisms you would need to harvest? Can't see a combine harvester fitting in the freight elevator.

There's a million and one things wrong with this idea. It's depressing how many news outlets haven't done any real journalism and checked with someone who actually grows any kind of plant for a living.

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