I spent wonderful times at Camp Windigo in my teens in the 1970's. There was a barn just behind the house and to its right. It was floored and filled with bunk beds for the summertime when large groups of kids would go up. I remember hearing that the church sold the property after the barn burned. (I also remember the showers in the barn being strictly cold!)
I don't remember a lot about the inside of the house except a great fireplace in the dining room, and a big kitchen. We didn't spend much time indoors-- when we were inside, we were always in front of the big fireplace. It would certainly be nice to save the house.
I wish I could remember how to get there-- I'd drive by this weekend when I'm out there on business. If you made an effort to stop demolition, I'd back you in name. I live in central Mass. now, so that's probably as much help as I could give.