When I was there around 4 PM during a weekday, there were 20-30 open stations in the garage below the visitors center. Ir looks like it is slso open past the time the visitors center was open but not known for sure. The garage also had Apple employee parking on the third level down so I can assume it is open 25 hrs.
It is if you have security clearance. Before and after regular business hours you need security clearance and identification.
No.
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