Comm service secondary conductors/conduits here (NJ) are customer installed & owned. Customer also installs primary conduit/ducts & POCO installs and owns the primary side. PS territory, the EC makes the secondary terminations, supplies the lugs & hardware, at the padmount. Responsibilities vary by POCOs, and areas.
The Life-Safety issues can pose additional obstacles, which should be discussed with the local AHJs (Fire Marshal) As this is a new building that probably has fire sprinklers, does it have a fire pump?
Was any mention of the genset size?? Wish to run the whole 2500 amp existing service loads? If you tie-in the existing life-safety the gen becomes 'legally required' as opposed to 'optional'; if there is a Fire Pump, that's another obstacle. Were any preperations 'made' for a 'future generator'?? You mention it is only 4 months old! Definite PE/EE/Architect required.
