A useful rule of thumb is that if you jump from a height of 100 feet (or more) and land on a hard surface (such as concrete), you have very little chance of surviving. In those circumstances, it doesn't really matter how you land.
If you want to "make assurance double sure" - to quote Macbeth - you could jump somewhere where it will be a long time before anyone realises that you have jumped. That way, even if you should happen to survive the fall, you would die of your injuries before anyone got to you.