The Space Management utilities in PostalCAD are incredible for creating visual and text based information for spaces within your plant.  A tip to help expedite the process is to use the  _BOUNDARY or the_BPOLY commands to create a boundary polyline along the border of a closed area.  Just pick a point and AutoCAD will search from that point outward to find the enclosed space.  Then just tag the space with the Tag Space utility.  Too easy!