Attached Link: http://www.kit3dmodels.com/

The aptly named 3D Furniture Models has one for $15 - select the designer (Mies van der Rohe) from the list on the left and you'll see it. Edited to add - this isn't a Poser Prop, but you should be able to import it without trouble. Some of their models are in DXF format, so you'd need to UV map them before you could apply a texture.