Great old Hamilton Manufacturing flat file map cabinet. This will hold your 36" x 24" documents. Blueprints, posters, mechanical drawings, or your own artwork. 

The cabinet is 44"w 33-3/4"d 16"h
The floor stand brings the top up to table height of 29-1/2"
Very heavy duty unlike the lightweight junk made today. Originally a dark green color with brass trim. It got painted black some time in the past 80 years.