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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.
Your second picture is a very recognisable location. I sussed out the house on Google maps - it’s a foreboding kind of architecture when it’s all closed up. I guess if you’re never there you don’t want people feeling like it’s accessible. The houses next door look like they have turntables for their cars in their driveways - that is some expensive luxury convenience there.