Your probably going have to check with your power company and local building dept. They all have different requirements in different areas. You'll probably have to pay an EC to pull a permit and clean things up before the power company will energize the service. They are not going to have any liability put on them. Beings that it is a commercial property the build dept. will probably require that an EC do the work. You might as well find out now as you will have to sooner or later. Talk to your local authority having jurisdiction whether that being the city, county or state..