Where is the "Additional Parking" at the Cross Border Xpress (CBX, on the San Diego side)?

I read on https://www.crossborderxpress.com/en/parking:

Additional Parking - $15 USD

Where is the "Additional Parking" in CBX?

At first I thought the "Additional Parking" may be the unlabeled parking lots on the following diagram, from the same webpage:

However, looking at Google Maps, some of these unlabeled lots are mostly empty:

And there are many parking lots nearby as well.

Pictures about "Where is the "Additional Parking" at the Cross Border Xpress (CBX, on the San Diego side)?"

Where is the "Additional Parking" at the Cross Border Xpress (CBX, on the San Diego side)? - Side view of unrecognizable people in outerwear walking on asphalt pavement near old houses and parked modern automobiles in town under cloudy sky

Where is the "Additional Parking" at the Cross Border Xpress (CBX, on the San Diego side)? - Side view full body of determined concentrated male athlete preparing for leap on border

Where is the "Additional Parking" at the Cross Border Xpress (CBX, on the San Diego side)? - Side view unrecognizable male in orange hoodie sitting on brick border in city park and wiping sweat from forehead with towel

How does CBX parking work?

All parking passes are date and location specific and cannot be exchanged for another day or location. To use the CBX reserved parking service you must complete your reservation at least 6 hours prior to your arrival. Park anywhere in Premium Lot that does not say "Reserved".

Where can I pick up CBX?

If you are picking up someone, you can drive in and pick them up at the exit of CBX terminal, but you can't park inside CBX. What airlines provide service at the CBX San Diego terminal? Aerom\xe9xico, Viva Aerobus and Volaris have counters at the CBX San Diego terminal.

What is the point of entry for CBX?

The CBX entrance is immediately adjacent to the baggage claim area. Do not exit to the public area of the airport, otherwise you will not be allowed to cross through CBX. All re-entries to the baggage claim area are prohibited.

How much does CBX charge for parking?

The CBX Parking Lot is always available, patrolled, and secure. The daily parking fee is $18.00 per day. The CBX parking lot is feet away from the CBX Terminal! If you have any other questions please feel free to contact us at 1-888-CBX-INFO.

CBX Crossing Parking Ticket

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Images: Mikhail Nilov, Darya Sannikova, Mary Taylor, Mary Taylor