Metal Roof with condensation

I am trying to solve a problem for my brother-in-law, he owns a 60 x 120 - 32 unit apartment complex which he purchased 2 years ago with existing problems and the main one is the roof. It currently consists of a standing seam built on top of a hot tar built up. They built steel studded walls running perpendicular to the gutter ends starting at 4'6" in the center and ending at approx. 8" at the gutter lines thus providing slope for the standing seam. The wall units are tied together with steel supports/girders every 4 feet and that is where the standing seam is attached to and everything is galvanized. There is no vapor barrier attached to the bottom side nor is there any insulation more than what is in the old roof system and the bottom of those panels are dripping wet on any given day which then puddles on the old roof deck and leaks into several of the apartments. The question I have is can that steel roofing provide that kind of condensation that he would have to sweep up 15 - 20 gallons of water on any given night given the right weather conditions. All of the snow has melted and run down to the cold overhangs and frozen that tells you what kind of warmth is in that attic space. They also have 16 - 8" stove hoods dumping into that space ( previously they would have been on the outside but are now on the inside with the new roof. He says there is no way it can condensate that much and says it is a gutter issue which he wants me to drop the built in gutter- by that I mean with a 3" flange up under the standing seam which we have secured with new butyl and washer screws, to 6-8" below the roof edge. My question would be how much can a roof like that condensate.