McCollum Park Park & Ride

As far as I know, it is intended for daily commuting only, and not overnight parking. The lot is generally locked by park rangers at night, so they would likely notice and deal with (ie, call in a tow truck) cars that appeared abandoned (there for multiple days/nights).

Awesome good stuff

I agree with asking Community Transit. It is a park and ride, so I would assume it would be fine for less than 24 hrs.