Creating 3D Isometric view of various structural elements in AutoCAD

1) The below images describe a 3D view of a Building basing upon the Plan and Elevation.

2)The below images describe a 3D view of a Building Facade basing upon the Plan and Elevation.

3)The below images describe a 3D view of a Staircase.

4)The below images describe a 3D view of a Wall with Spread Footing where even the Flooring along with the Slab and Parapet wall is also given.