From the article:
"Now we present Gordon Graff's Sky Farm proposed for downtown Toronto's theatre district. It's got 58 floors, 2.7 million square feet of floor area and 8 million square feet of growing area. It can produce as much as a thousand acre farm, feeding 35 thousand people per year and providing tomatoes to throw at the latest dud at the Princess of Wales Theatre to the east, and olives for the Club District to the north."
...and you can hide your weed in it.