I need a rough estimate of how much it would cost to run another electrical line to a condo. The condo only has 20 amps and needs at least 20 to 40 more. It's really small so more than that isn't necessary. The box is not to far from the condo, maybe 30 feet. But the line would have to go through the walls which are concrete unless it was left exposed which isn't ideal. Any ideas? Thanks.