This simple but powerful routine from Theodorus Winata allows you to rotate multiple blocks about their insertion point. You can do this in AutoCAD using the Properties command, but only if you are rotating all selected blocks to the same absolute rotation angle. Conversely, this LISP routine rotates the blocks to an angle relative to each individual block's current angle. Load the LISP routine and type in the command RMB. Select the block insertions, then enter a rotation angle.