imagine 3 side by side separate entry leases in 1 building
service comes into center lease with interior main panel for all 3 units, with branch metering
there is no access from the other leases for any type of ocd control/lock out, repair, servicing, upgrade or inspection without center unit lessor provision & allowance of access
I’m just going to throw a guess out there. Its sounds like it was originally a single unit divided into 3. With not giving access to panel for the other 2 units, I would suspect not a permitted division or interior doors providing access were locked and not allowing access
There is an exception in the NEC that would permit an installation like this however it’s highly restrictive. A similar requirement for access to the OCPD’s is in article 240.