I haven't been down there in over a year but $1 to a bag of donuts there are houses going in near that parking ramp sometime soon if construction hasn't already begun.
I can't figure out how to get ahold of Jesus Villareal, thinking maybe you and Mary know him. At any rate, Tesla now runs the old NUMI plant in Fremont. They aren't using the big North lot. Might be a chance they'd be amenable:
https://www.google.com/maps/place/45...6e26a14c243e97
Pacific rail depot in Milpitas (pretty sure this is still in use though):
https://www.google.com/maps/place/65...8e66bfd64ef337
Also in Fremont, this lot isn't far from NUMI and IIRC used to belong to NUMI as well. Access appears to be via the wrecking yard property to the North:
https://www.google.com/maps/place/67...6db48f4e2af05f
The holy grail is of course Moffett Field. Now that Google runs it perhaps there might be a chance?