I'm pretty sure another poster even said to you that parking garages generate revenue for their owners. They don't really cost much to operate and as long as there's land to build on and demand for parking, they'll generate revenue.
Of course, they still abide by the rules of supply and demand and if every building had their own parking garages, no one would be getting any revenue because there would be an oversupply of parking. That's why places like MGM Grand or Motor City Casino have free parking; they have so much parking but only use probably less than half of it. It wouldn't be profitable to charge rates.
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