The buildings in this folder are fashioned to be placed on the left side of the main (0) track.  Right side placement needs a reversal of the object. Like so:
Left side - 1000 @freeobject (0,200,-20,-4) means the center-front of building 1a (freeobj 200) is placed 20 meter to the left of track 0, and 4 meter lower, distance 1000 meter.
Right side - 1000 @freeobject (0,200,20,-4,180) means the center-front of the same building is placed 20 meter to the right of track 0 and 4 meter lower; and also turned around 180 degrees. The 4 meter is the hight of the track (actually 4.3m).
These objects are not copy protected in any way.