I live near that area in Contra Costa County, or Coco County.
I recall when the public bathrooms closed.
Most of us presumed they were closed because too many dopers were locking themselves inside, shooting there drugs, then passing out for X number of hours, all the while inconveniencing lots of paying train riders.
The secondary problem was many of the escalators were sodden with ‘secretly’ released body fluids that were never fully cleaned up.
I drive now, so no need to use BART.
Taking all bets to see how long that reopened loo stays open.
Ran into this problem at the MacArthur and West Oakland BART stations. Junkies liked to use the restrooms as private shooting galleries.