A collapsible and scaleable floor to ceiling post forming an exercise and perch system for domestic cats. Using integral platforms (37,44) that function as steps and perching areas (35). The post may be adjusted to different ceiling heights by adding or removing interchangeable sections (41,44) and provides fine adjustment with a telescopic section that is spring biased (28) to limit forces on the ceiling. The step/platforms are rotationally spaced by 120 degrees for an optimal rise to run ratio resulting in climbing comfort, ascend and descend speed, safety, and contemporary appearance. The post has a cross-section that forces step and loft mounting at 120° intervals using multiples of three cross-sectional facets. The assembly provides for a removable scratching area near the bottom of the post and padded perch area nearest the ceiling.