Rain doesn't form at an altitude of more than half a dozen miles or so, so your building would receive rain only near the base.What about rainwater collection and filtering too? a building of that size could collect a ton of rainwater each day or so all the way up feeding it all through a filter and into the tanks.


'Aim for the moon, if you miss you'll still be among the stars' and all that jazz...though not literally with this hair-brained idea, you'll just have a cable leading to nowhere