With the freeware utility ScaleBB, you can scale multiple selected objects in your Autodesk® AutoCAD® drawing, respective to their individual reference points or to their bounding boxes. The similar included function RotateBB allows also the rotation of multiple objects, again around their individual reference points.
Pick or type SCALEBB or ROTATEBB to run the command. Select the objects to scale and now move your mouse to dynamically set the common scale factor or rotation angle for all selected objects. You can specify the scale factor (and then scale the objects) relatively to the reference point of each object (the measurement is performed on the first one, by default), or to their bounding box (least rectangle) - either center or lower-left point. The current mode and scale factor are displayed in the status line.
You can switch working modes by pressing R, L, C, T, O or S to set the Reference point mode, Lower-left mode, Center mode, keyboard Typing mode, rOtation mode or back to the Scaling mode.