This camp/conference center seems to have been run by the Michigan Education Association which is basically the teacher's union. I am guessing it is now (or was) some sort of rehab center. I say that because it is the only structure of that magnitude on St Marys Lake. That and it seems to have been built in the 50's or 60's. There is a photo of what looks like the lobby below and it is quite something to see. I am not sure if that is intact today.