SimTower
This only works for the win95 version.

Exit windows and go into your C: prompt
Go into your simtower directory.
At your simtower prompt type:

Debug [name of saved tower].tdt
-e 102 5
-e 106 ff
-w
-q

Return to windows, load the tower you just modified, and now you have over $16 Billion and five stars. Have Fun! :) :) :) :) :) :)