Don't listen to these knobs
First go and find the local coordinates of the entities (eg. object#getLocalX, object#getLocalY)
then, when you need to find the object / walk to the object, you can get its position by grabbing the base coordinates of your instance (An instance area always fills an entire region)
So, the position in the instance would be:
new Position(objectLocalX + getMap().getBaseX(), objectLocalY + getMap().getBaseY(), z);