>>848999Commercial buildings average 12' per story, btw.
150' of climbing rope would be ideal. Kernmantel, continuous fibres, nylon. Harness and figure 8 and you're down in no time. Apart from that you'd want a thicker rope and to use a J-hook around your foot to lower yourself down. Easier going, up, but you can do it in reverse. Wear gloves.
>>848903It's not that heavy. You're just a girly man. I've used ropes of that length dropping trees. Suck it up, butter cup.