The apartment I was looking for formed part of a U-shaped block with a cracked and weed-grown concrete landing area in the centre. Amongst the array of sad-looking ground and flight vehicles, I spotted the micro-copter immediately. Someone had given it a purple and red-trim paint job recently, and though it still listed wearily to one side on its pods there were shiny clusters of expensive-looking sensor equipment fitted to the nose and tail. I nodded to myself and went up a flight of external steps to the second floor of the block.