MAGIC ERASER
One of the undocumented features of Sim City 2000 is the
ability to "erase" a structure that you have built and
then be able to re-use that land space while still
retaining the population values from the original
structure.  I have been able to use this technique to
"erase" 140 Launch Arcos and rebuild over the reclaimed
land space. When to use the query tool, the sim still
tells you it "sees" an arco. Here's how you do it:
1. Make a backup copy of your city in case you mess up
2. Click on the water/tree icon
3. Select trees
4. Hold down the shift key and the left mouse button
5. Slowly drag the mouse cursor over the tiles you want
   to erase while continuing to hold down the shift key
   and depressing the mouse button.  You will see your
   structures "disappear".
6. Make frequent use of the rotate view tool to make sure
   you only erase the tiles you have selected
7. If you release the shift key or mouse button by mistake,
   go back to step 2 and start over.