Looking for secured parking - $1 (south san francisco)

Looking for indoor secured parking for a Ford Econoline van.
It generally would be picked up 06:00-09:00 in morning & returned 15:00 - 19:00 M-T or T-F (tech going on a 4-10 soon) Generally no weekends unless an emergency job.
His car would need to be parked when the van was gone.
I can guarantee no multiple in/out, sleeping in van, using it for a party pad, no working on the van or "storing" stuff etc.
Just need a parking place.
I also am expecting that the van to be left alone when it is secured.
Anywhere from San Francisco to Millbrae would be acceptable.
Feel free to contact me to discuss the "situation" I am looking for a win/win.