I regret not getting clearer pictures to zoom in and see the words on the instruments but I felt the need to be discreet as I was just walking by, these ocean-front home garages are rarely/NEVER left open unattended. What is this mystery chamber?
One more different angle picture in the comments, you can see the seating bench in the chamber.
For reals. Because update: I walked past it again after work this evening now dark outside, and the garage door is still wide open! Fully lit inside and still no one in there. Very weird. Maybe they forgot they left their garage door open. But this area, there are billionaires and there are homeless people, you know how beaches are, so people are usually really tight about their security so it makes me wonder why they left their garage door open all day and I also wonder how there's been no intrusion or robbery yet.