A CSO spotted a male subject sitting on the top of the Millbrae Station and appeared he was going to jump off the ledge of the structure. The male was sitting on the edge, leaning forward and was talking to himself out loud. CIT trained Officers responded to the top of the structure and talked the male off the ledge of the structure. The male was placed on an emergency psychiatric hold and was transported to Mills Peninsula Hospital for psychiatric evaluation. The male stated he wanted to know how it felt to jump off the structure.