I didn't find the Tree House at the OSU webiste but there are other things that might be of interest or help. I'm still looking for a number you can call for the Tree House folks.
http://www.ohiounion.com/studentorgs/orgInfo.aspx?id=446
This might be the phone # for the Young Life Advisor -
Thomas H Hurley - (614) 488-1746 - 2727 Northwest Blvd, Columbus, OH 43221
A "Thomas Hurley" is listed as advisor on the website you cited.