A system for the evacuation of persons from a multi story structure during circumstances in which the normal escape mechanisms such as stairs and elevators are unusable for any reason. The system mounts externally of the affected structure and provides at least one evacuator upon which a person may ride in a controlled descent from an area of danger to an area of relative safety. The evacuator rides on a post and the evacuee may control the speed of his or her descent with a simple braking mechanism. A safety belt and foot rests provide a sense of security during the descent from danger.