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Just another guess, but it's probably why those parking spaces didn't/don't have doors--better ventilation. Also, if you're upstairs in the room you aren't sitting in the car with the engine running creating that carbon monoxide, and if you're in the car with the engine running you aren't upstairs breathing it in. Either way, it seems to be a relatively minor risk.
Minor risk, yes. Still, people have inadvertently left car engines running. A quick search shows that roughly 1,500 people succumb to accidental CO exposure annually in this country, and another 2,300 or so use it as a suicide method.
In Seattle there is a significant effort whenever it gets unusually cold to alert non-English speakers, especially those who came from tropical climes, not to use their barbecue grills as an indoor heat source. Yes, people have done that. And yes, people have died.