This architectural drawing is Top view of stair plan in detail AutoCAD drawing, dwg file, CAD file. A structure known as stairs is used to span a significant vertical distance by subdividing it into smaller vertical lengths known as steps. Stairs can be either straight, curved, or made up of several straight parts joined at an angle. The flat surface at the top and bottom of a staircase known as the landing is a resting area and doorway to a room. The segment of the staircase where it turns can also have a landing. For more details and information download the drawing file.