Customer stated one of the fireplaces in multiple units checked out, as well as figure out why the last two buildings were not getting gas to the outdoor regulator, and shut off Technician notes after inspecting the six fireplaces that were operational. I found no issues presented at that time, and each unit was operating as it should. As for the last two buildings we were not getting gas supply at the outdoor shut off past the regulator. Buildings are using natural gas with a 5 pounds gas meter. After getting verbal authorization to proceed with moving the regulator to further diagnose, the manager authorized The diagnostic fee, as well as the service fee Resolution after removing both regulators opening the valve I determined that the valve is opening and closing as it should, but there is still no gas supply exiting the line outside. The maintenance guy thinks the line was abandoned at some points back in 2008, but I saw no signs of a separate shut off or gas line feeding the last