Irish:
Comm work here (NJ) requires Lic EC and plans and permits.
AS to your situation, I'm sure that has happened to most all of us over the years.
Yes, people here 'sneak' work, both comm and resi.
As to defininition of abandonded....basically 'no longer in use'. Safe off and identify if being left in place for future use.
Reporting the guy is your personal decision.
