When exporting a Revit LT view to an AutoCAD file (DWG or DXF format), you can export rooms and areas as closed polylines.
The exported polylines match the boundaries of rooms in Revit LT. The room boundaries are exported onto a single layer. That layer is turned off by default in the AutoCAD file.
The polylines include the following XDATA information for room boundaries: Name, Number, Occupancy, Occupant, Department, and Comments. The polylines include the following information for area boundaries: Name and Comments.